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• W1543169898 abstract "All-trans-retinoic acid, an endogenous morphogen, induced neuronal differentiation of P19 murine embryonal carcinoma cells. Peak differentiation, as judged by the elaboration of neuronal processes, occurred 8 days after exposure of the cells to 0.5 mM retinoic acid, a concentration known to induce neuronal differentiation. An examination of the expression of the extracellular matrix receptors, integrins, during this retinoic acid-induced differentiation period, demonstrated a specific and strong induction of expression of two polypeptides (130 and 115 kDa) immunoprecipitated with an anti-human vitronectin receptor antiserum. The expression of a 90-kDa polypeptide, also immunoprecipitating with this antiserum was induced as well, but to a much smaller extent. The expression of a 96-kDa polypeptide immunoprecipitated by this antiserum and present in the untreated cells was not induced by retinoic acid. The increase in the expression of these polypeptides paralleled the neuronal differentiation of the P19 embryonal carcinoma cells. The expression of these integrins was not induced in a variant of the P19 cells, P19RAC65, which are resistant to differentiation induction by retinoic acid. Utilizing integrin subunit-specific anti-cytoplasmic peptide antibodies together with immunoprecipitation and Western blot analysis, the 130- and 115-kDa polypeptides were identified as the integrin alpha v and beta 1 subunits, respectively. The 90-kDa polypeptide, also induced by retinoic acid, was identified as beta 3, whereas the identity of the uninduced 96-kDa polypeptide remains unclear as yet. Peptide map analysis of deglycosylated polypeptides demonstrated that the 90- and 96-kDa polypeptides are distinct proteins and that the 115-kDa polypeptides immunoprecipitated with either anti-alpha v or anti-beta 1 antibodies are identical, further establishing that the 115-kDa polypeptide associating with alpha v is beta 1. The retinoic acid-induced expression of beta 1 occurred at the level of mRNA expression which also paralleled neuronal differentiation, but peaked slightly ahead of the cell surface expression of beta 1. The expression of other beta 1-associated alpha subunits was not induced by retinoic acid in these cells. These data demonstrate that retinoic acid strongly induces the expression of the integrin heterodimer alpha v beta 1 and also, to a smaller extent, the expression of alpha v beta 3. The retinoic acid-induced, high level surface expression of the alpha v beta 1 heterodimer is tightly correlated with the induction of neuronal differentiation by retinoic acid. This finding suggests an important role for the alpha v beta 1 heterodimer in the neuronal differentiation process." @default.
• W1543169898 created "2016-06-24" @default.
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• W1543169898 date "1991-11-01" @default.
• W1543169898 modified "2023-10-18" @default.
• W1543169898 title "Induction of expression of the alpha v beta 1 and alpha v beta 3 integrin heterodimers during retinoic acid-induced neuronal differentiation of murine embryonal carcinoma cells." @default.
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• W1543169898 doi "https://doi.org/10.1016/s0021-9258(18)54715-3" @default.
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