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pubmed-article:1662554pubmed:abstractTextWe investigated the role of transforming growth factor beta 1 (TGF-beta 1) in growth regulation of the murine osteoblastic cell line, MC3T3-E1. We detected TGF-beta activity in the conditioned medium of MC3T3-E1 cells and its activity was increased by acid treatment of the bioassay system using CC1 64 cells. Northern blot analysis revealed the expression of TGF-beta 1 precursor messenger ribonucleic acid (mRNA). MC3T3-E1 cells possessed a single class of high affinity TGF-beta 1 receptor (2.8 x 10(4) sites per cell, Kd = 196 pM). Cross-linking studies revealed three specific TGF-beta receptors with molecular masses of 65, 95 and 280 kDa. Both TGF-beta and epidermal growth factor (EGF) stimulated [3H]-thymidine incorporation into cells. EGF decreased the number of TGF-beta receptor dose-dependently, and pretreatment of cells with 10 nM EGF attenuated cell growth by TGF-beta. All these data suggested that TGF-beta might be an autocrine growth factor in murine osteoblastic MC3T3-E1 cells and that EGF might modulate the growth of cells by down-regulating the TGF-beta receptor level.lld:pubmed
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pubmed-article:1662554pubmed:articleTitleEpidermal growth factor attenuates cell proliferation by down-regulating the transforming growth factor-beta receptor in the osteoblastic cell line MC3T3-E1.lld:pubmed
pubmed-article:1662554pubmed:affiliationDepartment of Obstetrics and Gynecology, Osaka University Medical School, Japan.lld:pubmed
pubmed-article:1662554pubmed:publicationTypeJournal Articlelld:pubmed