Summary
Cyclic guanosine 3′, 5′ monophosphate (cGMP), cGMP-dependent protein kinase, calmodulin and cyclic adenosine 3′, 5′ monophosphate (cAMP) were localized in the uterus of the immature rat by an indirect immunofluorescence technique. cGMP, cGMP-dependent protein kinase and calmodulin were detected predominantly along epithelial and myometrial plasma membranes and in the adjacent cytoplasm. In contrast, cAMP immunoreactive material was found principally in the cytoplasm of connective tissue. After administration of 17 β estradiol, similar time-dependent changes were observed in the localization of cGMP, cGMP-dependent protein kinase and calmodulin in all uterine cell types. For the three compounds, nucleolar-like distribution of the immunofluorescence appeared approximately 12 h after treatment. A more dispersed, reticular distribution of the nuclear fluorescent staining was observed 20–24 h after hormonal treatment. Estrogen did not affect the localization of cAMP.
The simultaneous mobilization of cGMP, cGMP-dependent protein kinase and calmodulin towards the same nuclear loci suggests concerted roles for these three molecules in nuclear metabolic processes during the development of the uterotrophic action of estrogens.
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Flandroy, L., Cheung, W.Y. & Steiner, A.L. Immunofluorescent localization of cGMP, cGMP-dependent protein kinase, calmodulin and cAMP in the rat uterus. Cell Tissue Res. 233, 639–646 (1983). https://doi.org/10.1007/BF00212231
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DOI: https://doi.org/10.1007/BF00212231