Gender-specific 5-HT1A receptor changes in BrdU nuclear labeling patterns in neonatal dentate gyrus

John M. Greaves, Sharon S. Russo, Efrain C. Azmitia

Research output: Contribution to journalArticlepeer-review

Abstract

The actions of 5-HT1A receptors on cell proliferation in the rat neonatal dentate gyrus are unknown. We injected a 5-HT1A receptor agonist (ipsapirone) or antagonist (Way 100635) 1 h before injections of BrdU in neonates of both genders between days 2-4, a peak time of dentate gyrus granule cell proliferation. The BrdU immunoreactive (IR) nuclei in the granule cell layer and subgranular zone were examined after 2 weeks. The BrdU-IR nuclear staining patterns were classified as being either diffuse (homogenous dark BrdU-staining throughout the nucleus) or punctate (multiple distinct small stained spots within the nucleus). Most BrdU-labeled nuclei with a diffuse pattern were seen in the subgranular zone while the punctate pattern nuclei were seen within the granular cell layer of the dentate gyrus. 5-HT1A antagonist showed no overall change in absolute number or pattern of labeled nuclei compared to control animals. After a 5-HT1A agonist, there was also no differences in the total number of BrdU-IR nuclei (punctate and diffuse pattern). However, in both genders, the proportion of the BrdU-labeled nuclei showing a punctate compared to diffuse pattern increased: 33% in females and 18% in males. In females, the 5-HT1A receptor agonist increased the number of nuclei showing a punctate pattern by 41%, while in males the 5-HT1A receptor agonist decreased the number of nuclei showing a diffuse pattern by 29%. These results indicate gender-specific 5-HT1A receptor action on the state of nuclear DNA in the cells of the dentate gyrus, without increasing the total number of BrdU-labeled nuclei.

Original languageEnglish (US)
Pages (from-to)65-73
Number of pages9
JournalDevelopmental Brain Research
Volume157
Issue number1
DOIs
StatePublished - Jun 9 2005

Keywords

  • Differentiation
  • Diffuse
  • Granule cell
  • Hippocampus
  • Ipsapirone
  • Neurogenesis
  • Punctate
  • Subgranular

ASJC Scopus subject areas

  • Developmental Neuroscience
  • Developmental Biology

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