Long-term consequences of neonatal rearing on central corticotropin- releasing factor systems in adult male rat offspring

Paul M. Plotsky, K. V. Thrivikraman, Charles B. Nemeroff, Christian Caldji, Shakti Sharma, Michael J. Meaney

Research output: Contribution to journalArticlepeer-review

388 Scopus citations

Abstract

In a series of studies on the long-term consequences of neonatal rearing, we compared hypothalamic and extrahypothalamic central corticotropin-releasing factor (CRF) systems in male rats reared under conditions of animal facility rearing, nonhandling (HMS0), handling with brief maternal separation for 15 min (HMS15), or handling with moderate maternal separation for 180 min (HMS180) daily from postnatal days 2-14. CRF-like immunoreactivity (CRFir) was elevated in lumbar cerebrospinal fluid of adult HMS180 and HMS0 rats relative to the other groups. In the paraventricular nucleus, central nucleus of the amygdala, bed nucleus of the stria terminalis, and locus coeruleus, CRFir and CRF mRNA levels were significantly elevated in HMS0 and HMS180 rats. Neonatal maternal separation was associated with regionally specific alterations in CRF receptor type 1 (CRF1) mRNA density in HMS180 rats. No rearing-associated differences in CRF2α binding were apparent in either the lateral septum or the ventromedial hypothalamus. These findings indicate that early rearing conditions can permanently alter the developmental set-point of central CRF systems, and potentially influence the expression of behavioral and endocrine responses to stress throughout life, thereby providing a possible neurobiological substrate for the relationship between early life events and increased vulnerability for hypothalamic-pituitary-adrenal axis and coping skill alterations and the frequency of mood disorders in patients with a history of such experiences.

Original languageEnglish (US)
Pages (from-to)2192-2204
Number of pages13
JournalNeuropsychopharmacology
Volume30
Issue number12
DOIs
StatePublished - Dec 2005
Externally publishedYes

Keywords

  • Cerebrospinal fluid
  • Corticotropin-releasing factor receptors
  • Locus coeruleus
  • Maternal separation
  • Paraventricular nucleus
  • Stress

ASJC Scopus subject areas

  • Pharmacology

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