Expression of nitric oxide synthase and, effect of substrate manipulation of the nitric oxide pathway in mouse ovarian follicles
UNSPECIFIED. (2004) Expression of nitric oxide synthase and, effect of substrate manipulation of the nitric oxide pathway in mouse ovarian follicles. HUMAN REPRODUCTION, 19 (1). pp. 30-40. ISSN 0268-1161Full text not available from this repository.
Official URL: http://dx.doi.org/10.1093/humrep/deh032
BACKGROUND: Nitric oxide (NO) is a cell messenger with multiple actions in different biological systems, implicated in the control of follicle and oocyte function. NO is formed from L-arginine by isoforms of nitric oxide synthase (NOS) via N-G-hydroxy-L-arginine, with L-citrulline as a byproduct. This study aimed to show how modulation of NO by manipulating NOS substrates would affect mouse follicle growth and ovulation in vitro, where vascular effects of NO are attenuated. METHODS: Immunohistochemistry [endothelial (eNOS) and inducible (iNOS)] and in situ hybridization (iNOS) were applied on mouse ovaries. Cultured follicles were also stained for iNOS by immunohistochemistry. For follicles cultured in the presence or absence of L-arginine, the ability of L-citrulline or N-G-hydroxy-L-arginine to substitute for L-arginine was assessed in terms of follicle growth and ovulation. RESULTS: iNOS and eNOS were localized in oocytes and theca, with some staining in granulosa. iNOS mRNA occurred predominantly in granulosa and oocyte. Omission Of L-arginine significantly reduced follicle survival and ovulation. Partial compensation for L-arginine withdrawal was achieved with L-citrulline and N-G-hydroxy-L-arginine. Specific abnormalities of follicle growth were noted. CONCLUSIONS: NOS is present in mouse follicles, and its action is necessary at a local level for normal follicle development in vitro. Reduced growth, persistent basement membranes and reduced ovulation were associated with in vitro disruption of NO.
|Item Type:||Journal Article|
|Subjects:||R Medicine > RG Gynecology and obstetrics|
|Journal or Publication Title:||HUMAN REPRODUCTION|
|Publisher:||OXFORD UNIV PRESS|
|Number of Pages:||11|
|Page Range:||pp. 30-40|
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