Cited by 77Neuroendocrine regulation and behaviorNeurotransmitter Receptor Influence on BehaviorNeuroscience and Neuropharmacology Research

Oxytocin neurons mediate the effect of social isolation via the VTA circuits

Open access
Musardo, Stefano, Contestabile, Alessandro, Knoop, Marit, Baud, Olivier, Bellone, Camilla·2022·eLife

Published version of a preprint

Abstract

Social interaction during adolescence strongly influences brain function and behavior, and the recent pandemic has emphasized the devastating effect of social distancing on mental health. While accumulating evidence has shown the importance of the reward system in encoding specific aspects of social interaction, the consequences of social isolation on the reward system and the development of social skills later in adulthood are still largely unknown. Here, we found that 1 week of social isolation during adolescence in male mice increased social interaction at the expense of social habituation and social novelty preference. Behavioral changes were accompanied by the acute hyperexcitability of putative dopamine (pDA) neurons in the ventral tegmental area and long-lasting expression of GluA2-lacking AMPARs at excitatory inputs onto pDA neurons that project to the prefrontal cortex. Social isolation-dependent behavioral deficits and changes in neural activity and synaptic plasticity were reversed by chemogenetic inhibition of oxytocin neurons in the paraventricular nucleus of the hypothalamus. These results demonstrate that social isolation in male mice has acute and long-lasting effects on social interaction and suggest that homeostatic adaptations mediate these effects within the reward circuit.

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Written from the paper’s full text.

TL;DR

One week of social isolation during adolescence in male mice increased social interaction but impaired social habituation and social novelty preference. These acute and long-lasting behavioral changes were mediated by PVN oxytocin neurons, VTA putative dopamine neuron hyperexcitability, and GluA2-lacking AMPARs at PFC-projecting VTA dopamine neurons.

Key findings

  • Adolescent social isolation (P28–P35) increased social interaction versus group-housed controls (Mann-Whitney U=14, p=0.0052, n=10/group) without changing object exploration (p=0.2176), and also increased interaction with a former cage mate (t(13)=6.885, p<0.001).
  • Isolated mice showed impaired social novelty preference: unlike grouped mice (t(15)=5.774, p<0.001), isolated mice spent similar time with familiar and unfamiliar conspecifics (t(15)=0.102, p=0.9201); they also failed to habituate across 4 days (isolated Day 1 vs Day 4, p=0.9094; grouped p=0.0087).
  • Social isolation increased VTA putative dopamine neuron excitability (house condition main effect F(1,22)=8.016, p=0.0097) and PVN oxytocin neuron activity/density (cFos+ cells t(22)=2.510, p=0.0199; OXT+ cells p=0.0439; OXT+/cFos+ cells p=0.021). Chemogenetic inhibition of oxytocin neurons with CNO rescued social interaction (CNO treatment main effect F(1,28)=7.088, p=0.0127; CNO × housing p=0.0466).
  • Long-lasting effects at adulthood included increased social interaction (t(18)=3.004, p=0.0076), blocked by CNO during isolation (F(2,19)=9.430, p=0.0014), and increased rectification index at excitatory inputs onto VTA dopamine neurons projecting to PFC (t(12)=3.545, p=0.004), but not NAc (p=0.7176); intra-VTA NASPM normalized social interaction in regrouped mice (NASPM × housing F(1,24)=6.099, p=0.021).

Methods

  • Male wild-type and Oxt-hM4Di mice were used; adolescent isolation was single-housing from P28 to P35, with some mice regrouped until P60 for long-lasting experiments.
  • Behavioral assays included direct free interaction, three-chamber sociability/social novelty, long and short habituation, novel object recognition, elevated plus maze, and social conditioned place preference.
  • Neural methods included whole-cell patch-clamp recordings from VTA putative dopamine neurons and PVN-VTA projecting neurons, cFos/oxytocin/AVP immunofluorescence, retrograde CTB tracing from PFC/NAc/VTA, chemogenetic CNO treatment in drinking water, and intra-VTA NASPM infusion before behavior.

Limitations

  • The paper explicitly states that only male mice were studied and that the lack of females limits whether the results apply to both sexes; it notes sex differences in oxytocin’s behavioral effects and calls for future studies in females.
  • Evident from the text: some electrophysiology groups are small (e.g., AMPA/NMDA ratio n=5/group; several patch-clamp groups n=5–8), and behavioral scoring was manual, though experimenters were blinded.
  • Evident from the text: the study focuses on one isolation duration and age window, so conclusions about other durations or developmental periods are not established here.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.7554/elife.73421

Cites

56 of 56 references verified0 citation errors · 0 not checkable

Statistics

55 tests recomputed · 0 with the reported and recomputed p on opposite sides of .05

Claims the paper makes

0 of 60 cited sources checked · 0 supported · 0 flagged

  • Findingown data

    One week of social isolation during adolescence in male mice reduced social novelty preference.

    “at the expense of social habituation and social novelty preference”
    • Also stated in: § Results · hedged
      “indicating that social isolation affects social novelty preference.”
    Quote in the paperSubstantial claim
  • Findingown data

    One week of social isolation during adolescence in male mice impaired social habituation when the same juvenile conspecific was presented over four consecutive days.

    “After social isolation, mice presented deficits in habituation when exposed to the same juvenile conspecific for four consecutive days (Figure 1J–N).”
    • Also stated in: § Abstract · plain
      “at the expense of social habituation and social novelty preference”
    Quote in the paperSubstantial claim
  • Findingown data

    One week of social isolation during adolescence (P28-P35) in male mice increased social interaction with a conspecific compared with group-housed controls.

    “Here, we found that 1 week of social isolation during adolescence in male mice increased social interaction at the expense of social habituation and social novelty preference.”
    • Also stated in: § Results · plain
      “Isolated mice spent more time interacting with the conspecific than the grouped control mice (Figure 1C).”
    Quote in the paperSubstantial claim
  • Findingown data

    Object exploration did not differ between socially isolated and grouped control mice.

    “Conversely, object exploration did not differ between the two groups, indicating that social isolation preferentially affects social exploration (Figure 1B, D).”
    • Also stated in: § Results · plain
      “Time exploring object (Mann-Whitney U-test=33, p=0.2176, n=10 mice each group).”
    Quote in the paperSubstantial claim
  • Findingown data

    Chemogenetic inhibition of oxytocin neurons with CNO during social isolation prevented the increase in social interaction in isolated mice.

    “we found an increase in interaction time in untreated isolated versus grouped mice, while no difference was observed between mice treated with CNO independent of housing (Figure 3N).”
    Quote in the paperSubstantial claim
  • May combine two claims. 29
  • Classified as probably not a substantial claim. 37
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    Findingown data

    Sociability, social novelty preference, and social habituation were similar between grouped and regrouped mice.

    “Sociability, social novelty preference (Figure 4—figure supplement 1A-I), and social habituation were similar between grouped and regrouped mice (Figure 4E, I)”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    Social isolation did not affect the number of vasopressin-positive cells, AVP+/cFOS+ cells, or OXT+/AVP+ cells.

    “On the contrary, social isolation does not affect the number of vasopressin (AVP) positive cells nor the AVP+/cFOS+ or OXT+/AVP+ (Figure 3—figure supplement 1C, E, H)”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Findingown data

    During the first interaction, regrouped mice interacted more than grouped mice.

    “although during the first interaction, regrouped mice interacted more (Figure 4F).”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    In VTA-pDA:mPFC projecting neurons, there was a significant main effect of CNO treatment (F(1,23)=11.19, p=0.0028), a significant main effect of house condition (F(1,23)=5.459, p=0.0285), and a significant interaction (F(1,23)=11.22, p=0.028) on RI.

    “RI of VTA-pDA:mPFC projecting neurons (Two-way ANOVA followed by Tukey’s multiple comparisons test, CNO treatment main effect F(1, 23)=11.19, p=0.0028, House condition main effect F(1, 23)=5.459, p=0.0285, CNO treatment × Hous condition F(1, 23)=11.22, p=0.028, Grouped n=8, Grouped CNO n=7, Regrouped n=7, Regrouped CNO n=5 from two mice each group).”
    Quote in the paperSubstantial claim
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    Findingown data

    In social interaction time, there was a significant main effect of NASPM treatment (F(1,24)=13.78, p=0.0011), no significant main effect of house condition (F(1,24)=2.626, p=0.1182), and a significant interaction (F(1,24)=6.099, p=0.021).

    “Social interaction time (Two-way ANOVA followed by Tukey’s multiple comparisons test, NASPM treatment main effect F (1, 24)=13.78, p=0.0011, House condition main effect F(1, 24)=2.626, p=0.1182, NASPM × House condition F(1, 24)=6.099, p=0.021, Grouped Veh n=6, Grouped NASPM n=7, Regrouped Veh n=8, Regropued NASPM n=7).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    The increase in interaction is accompanied by deficits in social novelty preference and social habituation across days.

    “The increase in interaction is accompanied by deficits in social novelty preference and social habituation across days.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Interpretationown data

    Social isolation during adolescence increases social interaction at the expense of impaired social novelty preference and altered habituation to interact with a familiar conspecific.

    “and that social isolation during this period increases social interaction at the expense of an impaired social novelty preference and altered habituation to interact with a familiar conspecific.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Interpretationown data

    Social isolation induces an alteration of oxytocin rather than a modification of cell identity.

    “suggesting that social isolation induces an alteration of oxytocin rather than a modification of the cell identity.”
    Quote in the paperSubstantial claim
  • Classified as probably not a substantial claim. May combine two claims.

    Premisecitation

    Dopamine neurons of the ventral tegmental area are necessary and sufficient to promote social interaction.

    “Recent studies have highlighted the necessity and sufficiency of dopamine (DA) neurons of the ventral tegmental area (VTA) to promote social interaction (Gunaydin et al., 2014; Solié et al., 2022).”
    Quote in the paperSubstantial claim0 of 2 sources checked
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    Premisecitation

    Oxytocin in the VTA activates oxytocin receptors on dopamine neurons and regulates their activity, suggesting that oxytocin in the VTA gates social reward.

    “Oxytocin in the VTA activates oxytocin receptors on DA neurons regulates their activity, suggesting that oxytocin in the VTA gates social reward (Hung et al., 2017; Tang et al., 2014; Xiao et al., 2017).”
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    Interpretationown data

    Social isolation during adolescence leads to long-lasting effects in free/unrestrained social interaction accompanied by oxytocin neuron-dependent changes in synaptic transmission at excitatory inputs onto pDA neurons projecting to the PFC.

    “These data indicate that social isolation during adolescence leads to long-lasting effects in free/unrestrained social interaction accompanied by oxytocin neuron-dependent changes in synaptic transmission at excitatory inputs onto pDA neurons projecting to the PFC.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    In rodents, depending on the duration of juvenile social isolation, increased or decreased sociability in adulthood has been reported, suggesting that adolescence is a sensitive period for establishing social behavior later in life.

    “In rodents, depending on the duration of juvenile social isolation, increased or decreased sociability in adulthood has been reported, suggesting that adolescence is a sensitive period for establishing social behavior later in life (Yamamuro et al., 2020; Yamamuro et al., 2018; Makinodan et al., 2012; Rivera-Irizarry et al., 2020).”
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    Interpretationown data

    The increased activity of oxytocin neurons during social interaction induces synaptic scaling exerted by the presence of CP-AMPARs and these receptors are responsible for increased social interaction during adulthood.

    “The data presented here show that the increased activity of oxytocin neurons during social interaction induces synaptic scaling exerted by the presence of CP-AMPARs and that these receptors are responsible for increased social interaction during adulthood.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    The presence of a conspecific activates the oxytocin system, increases oxytocin release, activates dopamine neurons of the VTA, and promotes the initiation and maintenance of social interaction.

    “Indeed, the presence of a conspecific activates the oxytocin system, which increases oxytocin release, activates DA neurons of the VTA, and promotes the initiation and maintenance of social interaction (Resendez et al., 2020; Oettl et al., 2016).”
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    Premisecitation

    Brief periods of acute social isolation activate midbrain regions in humans and increase dopamine neuron activity within the dorsal raphe nucleus in mice.

    “Brief periods of acute social isolation have been reported to activate midbrain regions in humans (Tomova et al., 2020) and increase DA neurons’ activity within the dorsal Raphe nucleus (DRN) in mice (Matthews et al., 2016).”
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    Premisecitation

    Short-term isolation has increased social interaction in rats.

    “For example, short-term isolation has increased social interaction in rats (Niesink and van Ree, 1982).”
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    Interpretationown data

    The activity of oxytocin neurons within the PVN is causally linked to neuronal excitability within the reward system and the behavioral consequences of social isolation.

    “We next investigated the underlying mechanisms and found that the activity of oxytocin neurons within the PVN is causally linked to neuronal excitability within the reward system and the behavioral consequences of social isolation.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    Adolescence is a critical period for social interaction and the emergence of psychiatric diseases.

    “Indeed, adolescence is a critical period for not only social interaction (Larsen and Luna, 2018; ) but also the emergence of psychiatric diseases (Orben et al., 2020; Marco et al., 2011), and social isolation during adolescence can exacerbate mental health problems (Larsen and Luna, 2018; Almeida et al., 2021; ; Graf et al., 2021; Andersen, 2021).”
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    Premisecitation

    Acute social isolation during adulthood changes the synaptic strength at excitatory inputs onto DA neurons of the DRN in rodents, leaving synaptic transmission onto DA neurons of the VTA unaltered.

    “Remarkably, acute social isolation during adulthood changes the synaptic strength at excitatory inputs onto DA neurons of the DRN in rodents, leaving synaptic transmission onto DA neurons of the VTA unaltered (Matthews et al., 2016).”
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    Premisecitation

    Social isolation during adolescence can exacerbate mental health problems.

    “Indeed, adolescence is a critical period for not only social interaction (Larsen and Luna, 2018; ) but also the emergence of psychiatric diseases (Orben et al., 2020; Marco et al., 2011), and social isolation during adolescence can exacerbate mental health problems (Larsen and Luna, 2018; Almeida et al., 2021; ; Graf et al., 2021; Andersen, 2021).”
    Quote in the paperNot a substantial claim0 of 3 sources checked
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    Study design and conductreasoning

    The lack of female in the present study poses a limit in our results since we do not know whether our results apply to both sexes.

    “The lack of female in the present study poses a limit in our results since we do not know whether our results apply to both sexes.”
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    Premisecitation

    The adverse effects of social isolation are particularly apparent for adolescents.

    “The adverse effects of social isolation are particularly apparent for adolescents (Almeida et al., 2021; Orben et al., 2020).”
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    Premisecitation

    During adolescence, social and cognitive skills depend on peer-to-peer interactions.

    “During adolescence, social and cognitive skills depend on peer-to-peer interactions (Vanderschuren et al., 1997; Baarendse et al., 2013), and acute social isolation in rodents is sufficient to cause behavioral abnormalities, including increased vulnerability to drug addiction and depressive-like behavior, later in life (Lampert et al., 2017; Takatsu-Coleman et al., 2013; Whitaker et al., 2013).”
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    Premisecitation

    Social isolation is an adverse experience across social species with long-lasting behavioral and physiological consequences.

    “Social isolation is an adverse experience across social species with long-lasting behavioral and physiological consequences (Cacioppo et al., 2014).”
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    • cites Cacioppo et al., 2014 source

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    Interpretationown data

    Adolescence is a critical period for the establishment of social behavior and isolation during this period alters sociability during adulthood.

    “Although the duration of social isolation can explain the differences at the behavioral level between the two studies, these data show that adolescence is a critical period for the establishment of social behavior and that isolation during this period alters sociability during adulthood.”
    Quote in the paperSubstantial claim
  • Classified as probably not a substantial claim.

    Premisecitation

    Acute social isolation in rodents is sufficient to cause behavioral abnormalities, including increased vulnerability to drug addiction and depressive-like behavior, later in life.

    “During adolescence, social and cognitive skills depend on peer-to-peer interactions (Vanderschuren et al., 1997; Baarendse et al., 2013), and acute social isolation in rodents is sufficient to cause behavioral abnormalities, including increased vulnerability to drug addiction and depressive-like behavior, later in life (Lampert et al., 2017; Takatsu-Coleman et al., 2013; Whitaker et al., 2013).”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites Lampert et al., 2017 source

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    Study design and conductnone given

    The experimental mice were randomly assigned to the different groups.

    “The experimental mice were randomly assigned to the different groups.”
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    Premisecitation

    DA neurons in the VTA play a role in social behavior.

    “Previous studies have indicated the role of DA neurons in the VTA in social behavior (Gunaydin et al., 2014; Bariselli et al., 2018; Bariselli et al., 2016b) and shown that chronic isolation alters DA levels in the NAc (Hall et al., 1998; ).”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites Gunaydin et al., 2014 source

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    Interpretationreasoning

    During adulthood, increased social interaction is accompanied and causally linked to the increase in GluA2-lacking AMPARs at excitatory inputs onto pDA neurons projecting to the PFC.

    “During adulthood, increased social interaction is accompanied and causally linked to the increase in GluA2-lacking AMPARs at excitatory inputs onto pDA neurons projecting to the PFC.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Chronic isolation alters DA levels in the NAc.

    “Previous studies have indicated the role of DA neurons in the VTA in social behavior (Gunaydin et al., 2014; Bariselli et al., 2018; Bariselli et al., 2016b) and shown that chronic isolation alters DA levels in the NAc (Hall et al., 1998; ).”
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    Interpretationown data

    These data support the hypothesis that social interaction is a need and that the absence of social cues generates a craving response like that caused by food cues after fasting.

    “These data support the hypothesis that social interaction is a need and that the absence of social cues generates a craving response like that caused by food cues after fasting (Tomova et al., 2020).”
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    Premisecitation

    Estrogens play a fundamental role in the sexually dimorphic formation of brain structures by modulating neural circuits that control sex-specific behavior, including social interaction.

    “Indeed, estrogens play a fundamental role in the sexually dimorphic formation of brain structures by modulating neural circuits that control sex-specific behavior, including social interaction (Ogawa et al., 2020).”
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    Premisecitation

    These receptors are inserted at excitatory synapses after exposure to addictive drugs and have been proposed to mediate the incubation of drug craving.

    “These receptors are inserted at excitatory synapses after exposure to addictive drugs (Bellone and Lüscher, 2006) and have been proposed to mediate the incubation of drug craving (Conrad et al., 2008).”
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    Premisecitation

    GluA2-lacking AMPARs are CP ionotropic receptors with larger single-channel conductance and can undergo voltage-dependent blockade by polyamines.

    “GluA2-lacking AMPARs are CP ionotropic receptors with larger single-channel conductance and can undergo voltage-dependent blockade by polyamines (Twomey et al., 2018; Man, 2011).”
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    Premisecitation

    The presence of these receptors changes the rules for the induction of plasticity and mediates in vivo synaptic scaling.

    “Furthermore, the presence of these receptors changes the rules for the induction of plasticity (Mameli et al., 2011) and mediates in vivo synaptic scaling (Garcia-Bereguiain et al., 2013).”
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    Premisecitation

    Stress induces the insertion of these receptors, and local blockade of GluA2-lacking AMPARs attenuates stress-induced behavioral changes in rodents.

    “Moreover, it has also been shown that stress induces the insertion of these receptors, and local blockade of GluA2-lacking AMPARs was shown to attenuate stress-induced behavioral changes in rodents (Kuniishi et al., 2020; Yi et al., 2017).”
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    Premisecitation

    Gonadal steroids regulate Oxt activity, and estrogen seems to have higher impact on the Oxt system.

    “Gonadal steroids regulate Oxt activity, and among them, estrogen seems to have higher impact on the Oxt system (Richard and Zingg, 1990; Miller and Caldwell, 2015; Gimpl and Fahrenholz, 2001).”
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    Study design and conductnone given

    For VTA excitability, pDA neurons were identified according to their position (medially to the medial terminal nucleus of the accessory optic tract), morphology (large soma), and cell capacitance (> 28 pF).

    “For VTA excitability, pDA neurons were identified accordingly to their position (medially to the medial terminal nucleus of the accessory optic tract), morphology (large soma), and cell capacitance (> 28 pF, see Figure 5—figure supplement 2).”
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    Premisecitation

    Sex differences in oxytocin's behavioral effects can be found in rodents.

    “Although sex differences in oxytocin and oxytocin receptor distribution have not been reported, sex differences in oxytocin’s behavioral effects can be found in rodents (Miller and Caldwell, 2015; Tamborski et al., 2016; Hammock and Levitt, 2013).”
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    Study design and conductnone given

    Access resistance (10-30 MΩ) was monitored by a hyperpolarizing step of -4 mV at each sweep, every 10 s.

    “Access resistance (10–30 MΩ) was monitored by a hyperpolarizing step of –4 mV at each sweep, every 10 s.”
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    Premisecitation

    Neonatal oxytocin treatment modifies the development of social behavior resulting in a reduction of alloparenting, and treatment during puberty reduces social play behavior, both effects occurring only in female.

    “Indeed, neonatal oxytocin treatment modifies the development of social behavior resulting in a reduction of alloparenting (Mogi et al., 2014) and treatment during puberty reduces social play behavior (Bredewold et al., 2014). Both these effects occur only in female.”
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    Study design and conductreasoning

    The AMPA/NMDA ratio values may be underestimated because the ratio was calculated with spermine in the pipette.

    “The ratio values may be underestimated since it was calculated with spermine in the pipette.”
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    Study design and conductnone given

    Putative VTA-DA neurons were identified by larger soma compared to other cells and a capacitance >28 pF.

    “Putative VTA-DA neurons were identified for larger soma compared to the other cells and a capacitance >28 pF.”
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  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    In the brain there are sex differences in tissue structures and dimorphic nuclei exhibiting morphological sex differences are considered as the structural basis for generating sex differences in brain functions.

    “In the brain there are sex differences in the tissue structures and the dimorphic nuclei exhibiting morphological sex differences are considered as the structural basis for generating sex differences in brain functions (Ogawa et al., 2020).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Ogawa et al., 2020 source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductnone given

    Data were excluded when the access resistance changed >20%.

    “Data were excluded when the resistance changed >20%.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductnone given

    Cells with capacitance lower than 27 pF were not considered putative VTA-DA neurons.

    “Cells with capacitance lower than 27 pF were not considered putative-DA neurons (Figure 5—figure supplement 2).”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    The release of oxytocin in the VTA increases DA neuron firing within the VTA.

    “Previously, the release of oxytocin in the VTA was shown to increase DA neuron firing within the VTA (Xiao et al., 2017).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Xiao et al., 2017 source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Two weeks of social isolation after weaning altered the pathway from the medial PFC to the posterior paraventricular thalamus, leading to decreased sociability in adult mice.

    “Recently, it was reported that 2 weeks of social isolation after weaning altered the pathway from the medial PFC to the posterior paraventricular thalamus, leading to decreased sociability in adult mice (Yamamuro et al., 2020).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Yamamuro et al., 2020 source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Interpretationcitation

    DA neurons within the DRN mediate the loneliness-like brain state induced by social isolation, while DA neurons in the VTA mediate social craving.

    “It has been shown that human exposure to social cues after acute isolation evokes activity in the VTA (Tomova et al., 2020), suggesting that while DA neurons within the DRN mediate the loneliness-like brain state induced by social isolation, DA neurons in the VTA mediate social craving.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Tomova et al., 2020 source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductnone given

    All experimenters were blinded to perform behavioral manual scores and analyses.

    “All the experimenters were blinded to perform behavioral manual scores and analyses.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductnone given

    Nonparametric tests were also used when unequal variance was present.

    “Nonparametric tests were also used when unequal variance was present.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductcitation

    Statistical outliers were identified with the ROUT method (Q=1) and excluded from the analysis.

    “Statistical outliers were identified with the ROUT method (Motulsky and Brown, 2006) (Q=1) and excluded from the analysis.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Motulsky and Brown, 2006

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Study design and conductnone given

    The normality of sample distributions was assessed with the Shapiro-Wilk criterion, and when normality was violated nonparametric tests were used.

    “The normality of sample distributions was assessed with the Shapiro-Wilk criterion, and when violated nonparametric tests were used.”
    Quote in the paperNot a substantial claim
53 of 53
  • The paper relies on this without support.

    The role of oxytocin neurons in the behavioral consequences of social isolation is largely unknown.

    “the role of oxytocin neurons in the behavioral consequences of social isolation remains largely unknown.”
  • The paper relies on this without support.

    Social interaction is generally a rewarding experience with reinforcing properties.

    “Social interaction is generally a rewarding experience with reinforcing properties.”
  • The paper relies on this without support.

    Oxytocin neurons in the paraventricular nucleus of the hypothalamus directly project to the ventral tegmental area and release oxytocin there.

    “Oxytocin is a neuropeptide released by neurons within the paraventricular nucleus (PVN) of the hypothalamus that directly projects to the VTA.”
  • The paper relies on this without support.

    A short period of deprivation from conspecific interaction may also trigger aversive consequences.

    “Although anxiety, depression, and obsessive-compulsive behavior generally emerge after prolonged social isolation (Teo et al., 2013; Pietrabissa and Simpson, 2020; Leigh-Hunt et al., 2017), it is evident that a short period of deprivation from conspecific interaction may also trigger aversive consequences.”
4 of 4

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Statistics that don’t add up

Each reported p-value recomputed from its test statistic and degrees of freedom.

  • Inconsistent p-value: F(2, 60)=9.487, p > .001

    Minor

    The paper reports p > .001 here; recomputing from the test statistic and its degrees of freedom gives p < .001. The check cannot tell whether the statistic or the p-value is the misprint.

    Reported p > .001 · recomputed p < .001

  • Inconsistent p-value: F(6, 180)=2.828, p = .018

    Minor

    The paper reports p = .018 here; recomputing from the test statistic and its degrees of freedom gives p = .012. The check cannot tell whether the statistic or the p-value is the misprint.

    Reported p = .018 · recomputed p = .012

2 of 2

Statistics recomputed

Every reported test result, recomputed from its test statistic and degrees of freedom. A result shows as not adding up only once an independent check has confirmed it.

  • Doesn’t add upF(2, 60) = 9.487reported p > .001 · recomputed p < .001

    “F(2, 60)=9.487, p > .001”

  • Doesn’t add upF(6, 180) = 2.828reported p = .018 · recomputed p = .012

    “F(6, 180)=2.828, p = .018”

  • Consistentt(13) = 6.885reported p < .001 · recomputed p < .001

    “t(13)=6.885, p < .001”

  • Consistentt(15) = 5.975reported p < .001 · recomputed p < .001

    “t(15)=5.975, p < .001”

  • ConsistentF(1, 30) = 51.47reported p < .001 · recomputed p < .001

    “F(1, 30)=51.47, p < .001”

  • ConsistentF(1, 30) = 3.935reported p = .0565 · recomputed p = .057

    “F(1, 30)=3.935, p = .0565”

  • Consistentt(15) = 5.774reported p < .001 · recomputed p < .001

    “t(15)=5.774, p < .001”

  • Consistentt(15) = 0.102reported p = .9201 · recomputed p = .920

    “t(15)=0.102, p = .9201”

  • ConsistentF(1, 30) = 9.251reported p = .0049 · recomputed p = .005

    “F(1, 30)=9.251, p = .0049”

  • ConsistentF(1, 30) = 1.164reported p = .2892 · recomputed p = .289

    “F(1, 30)=1.164, p = .2892”

  • ConsistentF(1, 30) = 8.215reported p = .0075 · recomputed p = .008

    “F(1, 30)=8.215, p = .0075”

  • Consistentt(10) = 3.076reported p = .0117 · recomputed p = .012

    “t(10)=3.076, p = .0117”

  • ConsistentF(2.215, 22.15) = 6.775reported p = .0041 · recomputed p = .004

    “F(2.215, 22.15)=6.775, p = .0041”

  • ConsistentF(1, 10) = 1.455reported p = .2555 · recomputed p = .255

    “F(1, 10)=1.455, p = .2555”

  • ConsistentF(3, 30) = 4.349reported p = .0117 · recomputed p = .012

    “F(3, 30)=4.349, p = .0117”

  • Consistentt(5) = 5.706reported p = .0023 · recomputed p = .002

    “t(5)=5.706, p = .0023”

  • Consistentt(5) = 0.6552reported p = .5413 · recomputed p = .541

    “t(5)=0.6552, p = .5413”

  • ConsistentF(6, 132) = 2.23reported p = .044 · recomputed p = .044

    “F(6, 132)=2.230, p = .044”

  • ConsistentF(2.31, 50.82) = 36.65reported p < .001 · recomputed p < .001

    “F(2.310, 50.82)=36.65, p < .001”

  • ConsistentF(1, 22) = 8.016reported p = .0097 · recomputed p = .010

    “F(1, 22)=8.016, p = .0097”

  • Consistentt(22) = 2.51reported p = .0199 · recomputed p = .020

    “t(22)=2.510, p = .0199”

  • Consistentt(22) = 3.491reported p = .021 · recomputed p = .002

    “t(22)=3.491, p = .021”

    The paper states a correction for multiple tests

  • ConsistentF(1, 30) = 7.306reported p = .0112 · recomputed p = .011

    “F(1, 30)=7.306, p = .0112”

  • ConsistentF(1.857, 55.71) = 30.47reported p < .001 · recomputed p < .001

    “F(1.857, 55.71)=30.47, p < .001”

  • ConsistentF(1.962, 98.08) = 114.8reported p < .0001 · recomputed p < .001

    “F(1.962, 98.08)=114.8, p < .0001”

  • ConsistentF(1, 50) = 3.456reported p = .0689 · recomputed p = .069

    “F(1, 50)=3.456, p = .0689”

  • ConsistentF(1, 50) = 5.826reported p = .0195 · recomputed p = .019

    “F(1, 50)=5.826, p = .0195”

  • ConsistentF(6, 300) = 1.866reported p = .0865 · recomputed p = .086

    “F(6, 300)=1.866, p = .0865”

  • ConsistentF(6, 300) = 3.806reported p = .0011 · recomputed p = .001

    “F(6, 300)=3.806, p = .0011”

  • ConsistentF(1, 50) = 2.293reported p = .1363 · recomputed p = .136

    “F(1, 50)=2.293, p = .1363”

  • ConsistentF(6, 300) = 3.459reported p = .0026 · recomputed p = .003

    “F(6, 300)=3.459, p = .0026”

  • ConsistentF(1, 50) = 0.8745reported p = .3542 · recomputed p = .354

    “F(1, 50)=0.8745, p = .3542”

  • ConsistentF(1, 50) = 1.956reported p = .1681 · recomputed p = .168

    “F(1, 50)=1.956, p = .1681”

  • ConsistentF(1, 50) = 3.531reported p = .0661 · recomputed p = .066

    “F(1, 50)=3.531, p = .0661”

  • ConsistentF(1, 28) = 7.088reported p = .0127 · recomputed p = .013

    “F(1, 28)=7.088, p = .0127”

  • ConsistentF(1, 28) = 9.94reported p = .0038 · recomputed p = .004

    “F(1, 28)=9.940, p = .0038”

  • ConsistentF(1, 28) = 4.334reported p = .0466 · recomputed p = .047

    “F(1 ,28)=4.334, p = .0466”

  • Consistentt(18) = 3.004reported p = .0076 · recomputed p = .008

    “t(18)=3.004, p = .0076”

  • Consistentt(18) = 3.3717reported p = .7144 · recomputed p = .003

    “t(18)=3.3717, p = .7144”

    The paper states a correction for multiple tests

  • Consistentt(14) = 3.553reported p = .0032 · recomputed p = .003

    “t(14)=3.553, p = .0032”

  • ConsistentF(3, 42) = 2.607reported p = .064 · recomputed p = .064

    “F(3, 42)=2.607, p = .064”

  • ConsistentF(2.84, 39.76) = 32.66reported p < .001 · recomputed p < .001

    “F(2.840, 39.76)=32.66, p < .001”

  • ConsistentF(1, 14) = 8.24reported p = .0123 · recomputed p = .012

    “F(1, 14)=8.240, p = .0123”

  • Consistentt(7) = 3.923reported p = .0057 · recomputed p = .006

    “t(7)=3.923, p = .0057”

  • Consistentt(7) = 7.621reported p < .001 · recomputed p < .001

    “t(7)=7.621, p < .001”

  • ConsistentF(2, 19) = 9.43reported p = .0014 · recomputed p = .001

    “F(2, 19)=9.430, p = .0014”

  • Consistentt(8) = 0.0754reported p = .9417 · recomputed p = .942

    “t(8)=0.07544, p = .9417”

  • Consistentt(12) = 3.545reported p = .004 · recomputed p = .004

    “t(12)=3.545, p = .004”

  • Consistentt(10) = 0.372reported p = .7176 · recomputed p = .718

    “t(10)=0.3720, p = .7176”

  • ConsistentF(1, 23) = 11.19reported p = .0028 · recomputed p = .003

    “F(1, 23)=11.19, p = .0028”

  • ConsistentF(1, 23) = 5.459reported p = .0285 · recomputed p = .029

    “F(1, 23)=5.459, p = .0285”

  • ConsistentF(1, 23) = 11.22reported p = .028 · recomputed p = .003

    “F(1, 23)=11.22, p = .028”

    The paper states a correction for multiple tests

  • ConsistentF(1, 24) = 13.78reported p = .0011 · recomputed p = .001

    “F (1, 24)=13.78, p = .0011”

  • ConsistentF(1, 24) = 2.626reported p = .1182 · recomputed p = .118

    “F(1, 24)=2.626, p = .1182”

  • ConsistentF(1, 24) = 6.099reported p = .021 · recomputed p = .021

    “F(1, 24)=6.099, p = .021”

55 of 55

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

Each contradiction between two passages listed here was confirmed by an independent check.

  • Object-exploration test statistic conflicts with its reported p-value

    Minor

    For a two-sided t-test with 18 degrees of freedom, t=3.3717 implies a p-value of about 0.0034, not 0.7144. The reported p-value supports the paper's conclusion that object exploration was unaffected, whereas the reported t-statistic does not.

  • OXT/cFos t-statistic conflicts with its reported p-value

    Minor

    For a two-sided t-test with 22 degrees of freedom, t=3.491 implies a p-value of about 0.0021, not 0.021.

  • Reported degrees of freedom conflict with group sizes in Figure 5F

    Minor

    For the stated unpaired t-test with eight observations in each group, the degrees of freedom would be 14, not 12.

3 of 3

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Musardo, S., Contestabile, A., Knoop, M., Baud, O., & Bellone, C.
Affiliations
  • University of Geneva (CH)
  • Laboratory of Child Growth and Development, University of Geneva
Corresponding author
Bellone, Camilla
Venue
eLife
Published
2022-04-22
Volume
11
ISSN
2050-084X (ISSN-L)
OpenAlex
W4224239502
Cited by
77
References
56
Citations by year
2026: 8 · 2025: 31 · 2024: 20 · 2023: 9 · 2022: 9
FWCI
16.29
Type
journal article
Language
en
Open access
Locations
  • eLife (publishedVersion, cc-by)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Archive ouverte UNIGE (University of Geneva) (submittedVersion, cc-by-nc)
Funders
  • Swiss National Science Foundation (31003A_182326)
  • European Research Council (Consolidator grant 864552)
  • NCCR Synapsy (51NF40-185897)
Topics
  • Social Sciences › Psychology › Social Psychology › Neuroendocrine regulation and behavior
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
social isolation, oxytocin neurons, paraventricular nucleus, ventral tegmental area, dopaminergic neurons, social interaction, social novelty preference, reward systems, prefrontal cortex, chemogenetic inhibition, synaptic plasticity, homeostatic adaptation, social skills development
MeSH terms
Animals, Male, Neurons, Oxytocin, Reward, Social Isolation, Ventral Tegmental Area, Mice, Dopaminergic Neurons

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Claims read by deepseek-v4.1-flash under definition version 3 (extract-v3) on 2026-10-09.

Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-10-09.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

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