Cited by 269Neuroendocrine regulation and behaviorNeuropeptides and Animal PhysiologyOlfactory and Sensory Function Studies

A conditional knockout mouse line of the oxytocin receptor

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Lee, Heon-Jin, Caldwell, Heather K., Macbeth, Abbe H., Tolu, Selen G., Young, W. Scott·2008·Endocrinology

Abstract

Oxytocin plays important roles in reproductive physiology and various behaviors, including maternal behavior and social memory. Its receptor (Oxtr) is present in peripheral tissues and brain, so a conditional knockout (KO, −/−) would be useful to allow elimination of the receptor in specific sites at defined times. We created a line of mice in which loxP sites flank Oxtr coding sequence (floxed) enable Cre recombinase-mediated inactivation of the receptor. We expressed Cre recombinase in these mice either in all tissues (Oxtr−/−) or the forebrain (OxtrFB/FB) using the Ca2+/calmodulin-dependent protein kinase IIα promoter. The latter KO has reduced Oxtr binding beginning 21–28 d postnatally, leading to prominent reductions in the lateral septum, hippocampus, and ventral pallidum. The medial amygdala is spared, and there is significant retention of binding within the olfactory bulb and nucleus and neocortex. We did not observe any deficits in the general health, sensorimotor functions, anxiety-like behaviors, or sucrose intake in either Oxtr−/− or OxtrFB/FB mice. Females of both KO types deliver pups, but only the OxtrFB/FB mice are able to eject milk. Oxtr−/− males show impaired social memory for familiar females, whereas the OxtrFB/FB males appear to recognize their species but not individuals. Our results confirm the importance of oxytocin in social recognition and demonstrate that spatial and temporal inactivation of the Oxtr will enable finer understanding of the physiological, behavioral, and developmental roles of the receptor.

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Crossref · 10.1210/en.2007-1710

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  • A single intracerebroventricular infusion of OT before, but not after, the initial exposure completely rescues the deficit in social recognition in OTKO mice.

    “A single intracerebroventricular infusion of OT before, but not after, the initial exposure completely rescues the deficit in social recognition [82].”

    From Oxytocin and the Neural Mechanisms Regulating Social Cognition and Affiliative Behavior (2009) · cites this paper as [82]

    The Social recognition results report a deficit in Oxtr knockout mice, which supports the claim's background premise. They do not report an intracerebroventricular oxytocin infusion, a before-versus-after exposure comparison, or rescue of the deficit; the mice studied here also lack the oxytocin receptor, not oxytocin itself. No page number is available in our copy. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • Following a social encounter, Fos activation is normal in the olfactory bulb, but is markedly impaired in the medial amygdala and downstream projection sites of the amygdala in OTKO mice.

    “Analysis of neural activation patterns using Fos immunohistochemistry revealed that following a social encounter, Fos activation is normal in the olfactory bulb, but is markedly impaired in the medial amydala and downstream projection sites of the amygdala [82].”

    From Oxytocin and the Neural Mechanisms Regulating Social Cognition and Affiliative Behavior (2009) · cites this paper as [82]

    The Social recognition section reports investigation behavior, while the Oxtr binding in the brain section reports receptor-binding patterns. Neither reports Fos immunohistochemistry or compares Fos activation in the olfactory bulb, medial amygdala, and downstream sites after a social encounter (searched: Fos immunohistochemistry and Fos activation). (LLM, conf=0.76)

    Experimental — accuracy not yet measured
  • Site-specific infusion of OT into the medial amygdala, but not into the olfactory bulb, rescued the social recognition deficits in OTKO mice.

    “Site-specific infusion of OT into the medial amygdala, but not into the olfactory bulb rescued the social recognition deficits [82].”

    From Oxytocin and the Neural Mechanisms Regulating Social Cognition and Affiliative Behavior (2009) · cites this paper as [82]

    The Social recognition section reports impaired recognition in oxytocin-receptor knockout (Oxtr) mice, but does not report an oxytocin infusion or a rescue experiment. Searches for medial-amygdala and olfactory-bulb infusion and rescue found no passage addressing the claimed comparison; the paper also studies Oxtr knockout mice, not the OTKO mice named in the claim. (LLM, conf=0.78)

    Experimental — accuracy not yet measured
  • OTR knock-out mice display significant deficits in social recognition.

    “Similarly, OTR knock-out mice also display significant deficits in social recognition [69; 70; 71; 72].”
  • The brain areas in which alterations of OXT receptors were found are involved in the regulation of social recognition.

    “The brain areas in which we found alterations of OXT receptors are involved in the regulation of social recognition.”

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Authors
Lee, H.-J., Caldwell, H. K., Macbeth, A. H., Tolu, S. G., & Young, W. S.
Affiliations
National Institutes of Health (US)
Venue
Endocrinology
Published
2008-03-20
Volume
149
Issue
7
Pages
3256-3263
ISSN
  • 0013-7227 (ISSN-L)
  • 1945-7170
OpenAlex
W2026117260
Cited by
269
References
43
Citations by year
2026: 8 · 2025: 6 · 2024: 18 · 2023: 9 · 2022: 5 · 2021: 13 · 2020: 33 · 2019: 15 · 2018: 18 · 2017: 25 · 2016: 15 · 2015: 27 · 2014: 13 · 2013: 14 · 2012: 14
FWCI
16.01
Type
journal article
Language
en
Open access
Locations
  • Endocrinology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Institute of Mental Health (Z01MH002498)
Topics
  • Social Sciences › Psychology › Social Psychology › Neuroendocrine regulation and behavior
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
  • Life Sciences › Neuroscience › Sensory Systems › Olfactory and Sensory Function Studies
Keywords
oxytocin receptor, conditional knockout mice, Cre recombinase, lateral septum, hippocampus, ventral pallidum, medial amygdala, olfactory bulb, social recognition, social memory, maternal behavior, milk ejection, anxiety-like behavior, sucrose intake
MeSH terms
Animals, Autoradiography, Behavior, Animal, Eating, Female, Genotype, Male, Memory, Mice, Inbred Strains, Phenotype, Sucrose, Time Factors, Blotting, Southern, Prosencephalon, Receptors, Oxytocin, Mice, Knockout, Integrases, Recognition, Psychology, Mice

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