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- W2238894705 abstract "We investigated the effects of phorbol ester (phorbol 12-myristate 13-acetate; PMA) treatment on the adhesive behaviour of three erythroleukaemia cell lines: HEL, LAMA-84 and AP217. In the three cell lines PMA induced an increase in expression of a megakaryocytic marker: alpha IIb beta 3 integrin, but did not promote activation of this receptor. Indeed, an antibody specific for the activated form of alpha IIb beta 3 failed to react with the three cell lines. PMA induction led to different adhesive phenotypes depending on the cell line; in fact LAMA-84 and HEL cells became adherent while AP217 cells remained non-adherent. By studying cell surface receptors we found that the major difference between the adherent and the non-adherent cells was the expression of beta 1 integrins. After PMA induction, beta 1 integrin expression was totally abolished in AP217 cells and the amount of beta 1 mRNA was reduced preventing new synthesis of the subunit. In HEL and LAMA-84 cells, PMA treatment did not alter the overall level of beta 1 integrin but induced a new pattern of alpha-subunit expression: up-regulation of alpha 2 and alpha v subunits and down-regulation of alpha 4 and alpha 5 subunits. Function-perturbing antibodies against beta 1, alpha 4, alpha 5, alpha v and alpha 2 reduced adhesion of HEL cells to fibronectin or collagen, whereas antibodies against beta 3 or alpha v beta 3 did not. Our results favour the involvement of beta 1 integrins in PMA-induced adhesion of erythroleukaemia cells." @default.
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- W2238894705 date "1995-07-15" @default.
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- W2238894705 title "<i>β</i> 1 integrins mediate adherent phenotype of human erythroblastic cell lines after phorbol 12-myristate 13-acetate induction" @default.
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- W2238894705 doi "https://doi.org/10.1042/bj3090491" @default.
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