Author： Suzuki H. Yamamoto T. Kikuyama S. Uemura H.
Publisher： Academic Press
ISSN： 0016-6480
Source： General and Comparative Endocrinology, Vol.107, Iss.1, 1997-07, pp. : 12-22
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Abstract
Immunohistochemical and immunocytochemical techniques were employed to investigate the distribution of endothelin 3 (ET3)-like immunoreactivity in the pituitary of the bullfrog, Rana catesbeiana. ET3-immunoreactive (ET3-IR) cells were scattered all over the pars distalis of the female pituitary; however, only a few ET3-IR cells were observed in the male pituitary. ET3-IR cells were found to correspond to cells immunostained with monoclonal antibodies against the beta-subunit of bullfrog LH (fLHbeta) or monoclonal antibodies against the beta-subunit of bullfrog FSH (fFSHbeta) at the light microscopic level. However, we could not find ET3-IR cells which were immunoreactive for other pituitary hormones. So far, all ET3-IR cells showed both fLHbeta and fFSHbeta immunoreactivity. About 24% of the fLHbeta-IR cells and about 33% of the fFSHbeta-IR cells showed ET3-like immunoreactivity. Immunoelectron microscopic analysis using colloidal gold revealed the coexistence of ET3-like substance(s) and gonadotropins within the same granules. This study demonstrated the presence of ET3-like peptide(s) in bullfrog gonadotrophs, suggesting the possible participation of ET3 in regulating pituitary function as an autocrine and/or paracrine hormone.
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