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Concentration and Phosphoinositide Metabolism in Mouse Osteoblasts via Cyclic Adenosine 3 \ 5 '-Monophosphate-Independent Pathways Regulation of Diazepam Binding Inhibitor in Rat Adrenal

T POTENT mitogen and angiogenic agent basic fibroblast growth factor (bFGF) has been isolated from various tissues, including the bovine and human testes (1-4). At present, however, the localization of bFGF and its function in the adult testis are not clear. In the developing testis of the fetal rat, Leydig cells were bFGF immunoreactive (5). Involvement of bFGF in the control of testicular function was proposed in the immature rat, because bFGF inhibits LH-stimulated androgen production by cultured neonatal rat testicular cells (6). In the growing postnatal testis of the rat, the Sertoli cell apparently is able to produce a bFGF-related factor, as concluded from in vitro experiments with isolated Sertoli cells from immature rats (4, 7). In the present study we have shown expression of a 30-kDa bFGF-like protein in germ cells of the adult testes of two rodent species, rat and mouse, and, in addition, in the immature rat testis, using a recently characterized, highly specific antiserum against bFGF (8, 9). Materials and Methods