Early neonatal experience of Long-Evans rats results in long-lasting changes in morphine tolerance and dependence
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.
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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
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“, 2005) as well as sensitivity to ligands (Kalinichev et al., 2001; Vazquez et al., 2005).”
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- Authors
- Kalinichev, M., Easterling, K. W., & Holtzman, S. G.
- Affiliations
- Emory University (US)
- ORCID
- Kalinichev, Mikhail
- 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
- Licence
- www.springer.com/tdm (tdm)
- 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
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