NDLI: Influence of ovarian hormones on endocrine activity of gonadotroph cells in the adenohypophysis of lambs during the postnatal transition to prepuberty.

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Influence of ovarian hormones on endocrine activity of gonadotroph cells in the adenohypophysis of lambs during the postnatal transition to prepuberty.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Wankowska, Marta Polkowska, Jolanta Misztal, Tomasz Romanowicz, Katarzyna
Description	Country affiliation: Poland Author Affiliation: Wankowska M ( Department of Endocrinology, The Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, Instytucka 3, Jablonna, Poland.)
Abstract	There is juvenile hiatus during maturation of larger mammals with relatively long life spans. Using histomorphological and functional criteria we describe the feedback mechanisms which could play a role in the regulation of the gonadotrophic axis during the postnatal transition to the quiescent prepubertal period in sheep. The aim of this study was to determine the influence of ovarian factors on the endocrine activity of gonadotroph cells, the site of synthesis, storage and release of luteinizing hormone (LH) and follicle-stimulating hormone (FSH), in adenohypophyses of weanling and weaned prepubertal lambs. The examination was made in (i) 9-week-old infantiles, suckling lambs undergoing weaning, ovary-intact (OVI) and ovariectomised (OVX) at the 6th week of age, and (ii) 16-week-old juveniles OVI and OVX at the 12th week of age (n=5 per group). Changes in gonadotrophs were assayed with hybridohistochemistry, immunohistochemistry and radioimmunoassay. The percentage of the adenohypophyseal area (PA) occupied by gonadotrophs containing LHbeta-mRNA and immunoreactive for LHbeta was lower (P<0.05), whereas the PA occupied by cells containing FSHbeta-mRNA and immunoreactive for FSHbeta was higher (P<0.05) in the 16-week-old OVI lambs in comparison with the 9-week-old ones. The mean concentration and basal level of LH in the peripheral blood plasma were greater (P<0.05) in the 16-week-old OVI lambs in comparison with the 9-week-old group, whereas the circulating FSH was not different. In the OVX 9-week-old lambs, the PA occupied by gonadotrophs containing LHbeta-mRNA and the plasma LH concentration, basal level, pulse frequency and amplitude were greater (P<0.05), whereas the PA occupied by cells immunoreactive for LHbeta was lower (P<0.05) in comparison with the OVI group. In the OVX 16-week-old lambs, the PA occupied by gonadotrophs containing LHbeta-mRNA and immunoreactive for LHbeta, the LH plasma concentration, basal level and pulse frequency were (P<0.05) greater in comparison with the OVI group. The PA occupied by gonadotrophs containing FSHbeta-mRNA and the plasma FSH concentration were greater (P<0.05) in the OVX 9- and 16-week-old lambs in comparison with the OVI ones. The ovariectomy had no effect on the PA occupied by cells immunoreactive for FSHbeta in both age stages. In conclusion, ovarian factors may play inhibitory role in regulating both LH and FSH synthesis rate and release and stimulatory role in regulating LH storage in adenohypophyseal gonadotrophs in infantile lambs. In lambs at the beginning of the juvenile period, ovarian factors may play only inhibitory role in regulating both LH and FSH synthesis and release and LH storage. The effects of ovarian hormones on the gonadotrophin storage, i.e. releasable pools in adenohypophyseal cells, are specific for LH, no such effects are apparent on FSH in lambs during the postnatal transition to prepuberty. Thus, the initiation of the juvenile period in female sheep is a function of change of the stimulatory role of ovarian hormones in regulating LH storage to the inhibitory one.
File Format	HTM / HTML
ISSN	03784320
Issue Number	1-2
Volume Number	121
e-ISSN	18732232
Journal	Animal Reproduction Science
Language	English
Publisher	Elsevier
Publisher Date	2010-08-01
Publisher Place	Netherlands
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Animal science Discipline Reproductive Medicine Discipline Veterinary Medicine Discipline Zoology Gonadal Hormones Pharmacology Gonadotrophs Drug Effects Pituitary Gland, Anterior Sexual Maturation Sheep Animals Animals, Newborn Animals, Suckling Endocrine System Metabolism Female Follicle Stimulating Hormone Blood Genetics Luteinizing Hormone Ovariectomy Ovary Physiology Growth & Development Weaning Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Medicine Animal Science and Zoology Endocrinology Food Animals

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