Immunocytochemical studies on the LHRH system of the Japanese quail: influence by photoperiod and aspects of sexual differentiation.

Abstract:

:Immunocytochemistry was used to determine if photoperiod and/or sex have any effect on the pattern of the luteinizing hormone-releasing hormone (LHRH) system in the brain of the Japanese quail. Immunopositive perikarya were found within three major areas of the brain: the rostral paraolfactory lobe, the preoptic, and the septal region. A quantitative analysis of LHRH cell numbers was performed on male and female quail after two photoperiodic treatments: sexually mature birds exposed to 24 weeks of 20 h light: 4 h darkness (20L:4D), and birds with a regressed reproductive system (induced by transfer from a photoregime of 20L:4D to 25 short days of 8L:16D). Two-way analysis of variance showed that short-day males display significantly (p less than 0.05) more immunopositive perikarya (607 +/- 134) than long-day males (291 +/- 114), short-day females (293 +/- 103) or long-day females (330 +/- 92). The density of LHRH-immunoreactive nerve fibres and the intensity of the immunostaining in the median eminence were always greater in long-day sexually mature quail (male and female) than in animals exposed to 25 days of 8L:16D. These results demonstrate that the LHRH system of the quail is influenced by photoperiod and mirrors sexual differentiation.

journal_name

Cell Tissue Res

journal_title

Cell and tissue research

authors

Foster RG,Panzica GC,Parry DM,Viglietti-Panzica C

doi

10.1007/BF00222289

subject

Has Abstract

pub_date

1988-08-01 00:00:00

pages

327-35

issue

2

eissn

0302-766X

issn

1432-0878

journal_volume

253

pub_type

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