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Título: | cAMP inhibits IGF-I-induced mitogenesis in fetal rat brown adipocytes: Role of p21 ras |
Autor: | Valverde, Ángela M. CSIC ORCID ; Lorenzo, Margarita; Teruel, Teresa; Benito, Manuel | Fecha de publicación: | 1995 | Editor: | Elsevier | Citación: | Experimental Cell Research 218(1): 305-309 (1995) | Resumen: | Dibutyryl cAMP (DBcAMP) inhibited insulin-like growth factor I (IGF-I)- induced DNA synthesis of rat fetal brown adipocyte primary cultures. Its mitogenic inhibitory capacity, measured as [3H]thymidine incorporation into acid-precipitable material, was dose-dependent, being maximal at 0.5 mM. The entry of cells into S + G2/M phases of the cell cycle and the increase in cell number induced by IGF-I were partially inhibited by DBcAMP at 24 h and totally prevented at 48 h. DBcAMP inhibited the mRNA expression of c-myc induced by IGF-I at 2 h. Moreover, DBcAMP inhibited in parallel H-ras mRNA expression, p21 ras, and proliferating cellular nuclear antigen protein content induced by IGF-I at 24 and 48 h of culture, respectively, suggesting the involvement of p21 ras in the progression of fetal brown adipocytes through the S phase of the cell cycle and DNA synthesis. | URI: | http://hdl.handle.net/10261/152471 | DOI: | 10.1006/excr.1995.1159 | Identificadores: | doi: 10.1006/excr.1995.1159 issn: 0014-4827 e-issn: 1090-2422 |
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