Modulation of estrous cycle and LH, FSH and melatonin levels by pinealectomy and sham-pinealectomy in female rats

Modulation of estrous cycle and LH, FSH and melatonin levels by pinealectomy and sham-pinealectomy in female rats

Autor Dardes, Rita de Cássia de Maio Autor UNIFESP Google Scholar
Baracat, Edmund Chada Autor UNIFESP Google Scholar
Simoes, M. J. Google Scholar
Instituição Universidade Federal de São Paulo (UNIFESP)
Resumo 1. the pineal has been shown to have a role in controlling reproduction of polyestrus mammals (like humans and laboratory rodents). It influences the age of sexual maturation; the timing of the ovulatory cycle; and gonadal steroidogenesis.2. Here the authors report the early and late effects of pinealectomy (Px) and sham-pinealectomy (SPx) on the estrous cycle periodicity, plasma LH, FSH and urinary 6-sulphatoxymelatonin (6-SMT) excretion in female rats.3. Female Wistar rats (3-4 months of age) were maintained on 12/12 L/D cycle. Orbital venous plexus blood and urine samples were collected from the same rat during the estrus phase before surgery, 4-7 and 55-60 days post surgery.4. Daily vaginal smears were taken to monitor the estrous cycle and they showed a time dependent increase in the estrus stage duration in Pr rats (estrus stage: 1 day in control; 3-4 days after 45 days pr).5. the decrease of gonadotropins at early post Pr was due to surgical stress.6. 6-SMT levels were significantly lower at 4-7 days post SPx, but at 55-60d post surgery these levels returned to control values, which indicate pineal gland integrity. the reduction in urinary 6-SMT may be attributed to a possible high level of plasma corticosterone occurring after surgical manipulations.7. 6-SMT levels in Pr rats were extremely lower at 4-7 and 55-60 days post surgery, but not null, confirming the surgical removal of the pineal gland and indicating the synthesis of melatonin in sites other than the pineal gland.
Palavra-chave estrous cycle
FSH
LH
pinealectomy
6-sulphatoxymelatonin
Idioma Inglês
Data de publicação 2000-04-01
Publicado em Progress in Neuro-psychopharmacology & Biological Psychiatry. Oxford: Pergamon-Elsevier B.V., v. 24, n. 3, p. 441-453, 2000.
ISSN 0278-5846 (Sherpa/Romeo, fator de impacto)
Publicador Elsevier B.V.
Extensão 441-453
Fonte http://dx.doi.org/10.1016/S0278-5846(99)00110-4
Direito de acesso Acesso restrito
Tipo Resenha
Web of Science WOS:000086728900007
Endereço permanente http://repositorio.unifesp.br/handle/11600/26282

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