Cited by 56Neuropeptides and Animal PhysiologyStress Responses and CortisolNeurotransmitter Receptor Influence on Behavior

Early neonatal experience of Long-Evans rats results in long-lasting changes in morphine tolerance and dependence

Kalinichev, Mikhail, Easterling, Keith W., Holtzman, Stephen G.·2001·Psychopharmacology

Abstract

Rationale Daily, 3-h separations from the dam on postnatal days 2-14 produce long-lasting changes in behavioral and neuroendocrine responses to stressors and sensitivity to acute morphine in Long-Evans rats.Objective We tested whether offspring that were separated from their dam for 3 h daily (MS) on postnatal days 2-14 exhibit altered sensitivity to chronic morphine, compared to animals that experienced only brief (15 min) separations (H) from the dam or that were left undisturbed (NH) during the same period.Methods Subjects received 1 week SC infusion of either morphine, or saline via osmotic pumps. Twenty-hours after pump removal, the global opioid withdrawal scores were recorded. Four hours later, animals were tested for antinociception (tail-flick and hot-plate tests) during cumulative morphine administration.Results MS males and MS females undergoing withdrawal from chronic morphine had higher global withdrawal scores compared to NH controls. MS males (but not MS females) were less sensitive to the antinociceptive effects of morphine compared to H and NH controls, primarily in the hot-plate test, regardless of whether they had received a saline or a morphine infusion. MS males consistently exhibited significant morphine tolerance, whereas control males failed to exhibit tolerance either in the hot-plate test (NH group) or in both antinociception assays (H group). In contrast, tolerance was exhibited by all females in both tests for antinociception.Conclusions These data indicate that repeated neonatal maternal separation alters sensitivity to chronic morphine administration in a sex-dependent manner.

Integrity signals

Registry

Crossref · 10.1007/s002130100806

Cites

47 of 47 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

This paper’s full text isn’t openly available, so its claims and self-check weren’t run. The registry and citation checks still apply.

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?

  • Maternal separation is associated with changes to the opioid system, but results conflict depending on methodology, showing both increases and decreases in endogenous peptide levels and ligand sensitivity.

    “Changes to the opioid system are also apparent with maternal separation, but conflicting results also exist based on specific methodology, demonstrating both increases and decreases in levels of endogenous peptides (Ploj et al., 2003; Vazquez et al., 2005) as well as sensitivity to ligands (Kalinichev et al., 2001; Vazquez et al., 2005).”

    From The effects of early life stress on reward processing (2018) · cites this paper as Kalinichev et al., 2001

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Kalinichev, M., Easterling, K. W., & Holtzman, S. G.
Affiliations
Emory University (US)
Venue
Psychopharmacology
Published
2001-07-25
Volume
157
Issue
3
Pages
305-312
ISSN
  • 0033-3158 (ISSN-L)
  • 1432-2072
OpenAlex
W1979162388
Cited by
56
References
47
Citations by year
2024: 1 · 2023: 2 · 2021: 5 · 2019: 1 · 2018: 4 · 2017: 3 · 2015: 1 · 2014: 2 · 2013: 1 · 2012: 3
FWCI
1.11
Type
journal article
Language
en
Open access
closed
Locations
  • Psychopharmacology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Institute on Drug Abuse (K05-DA00008, DA11384, K05DA000008, R21DA011384)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
Keywords
neonatal maternal separation, morphine tolerance, morphine dependence, opioid withdrawal, antinociception, sex differences, postnatal development, Long-Evans rats, chronic morphine administration
MeSH terms
Analgesics, Opioid, Animals, Animals, Newborn, Drug Tolerance, Female, Male, Maternal Deprivation, Morphine, Morphine Dependence, Pain Measurement, Reaction Time, Sex Characteristics, Substance Withdrawal Syndrome, Rats, Long-Evans, Rats

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.

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 ›

Are you an author, or do you see a problem with this page? Request a review