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The A-type Receptor for Platelet-derived Growth Factor Mediates Protein Tyrosine Phosphorylation, Receptor Transmodulation and a Mitogenic Response

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Journal Biochem J
Specialty Biochemistry
Date 1989 Nov 15
PMID 2481443
Citations 1
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Abstract

A clonal human glioma cell line, U-343 MGa 31L, which expresses the A-type but not the B-type receptor for platelet-derived growth factor (PDGF), was used in a functional study of the A-type receptor. PDGF-AA induced, in a dose- and time-dependent manner, phosphorylation on tyrosine residues of the receptor in metabolically labelled cells. The optimal dose was around 30 ng/ml; at 100 ng/ml, phosphorylation was maximal at 15 min and had almost returned to the control level after 60 min. The phosphorylation on tyrosine residues of the PDGF A-type receptor was stimulated by PDGF-AA, PDGF-AB and PDGF-BB; these isoforms also stimulated [3H]thymidine incorporation into U-343 MGa 31L cells. In addition, activation of the A-type PDGF receptor induced transmodulation of the epidermal growth factor receptor.

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PMID: 2071544 DOI: 10.1007/BF02630963.

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