Human vascular smooth muscle cells have at least two distinct PDGF receptors and can secrete PDGF-AA.

Abstract:

:Platelet-derived growth factor (PDGF), a potent mitogen and chemoattractant for smooth muscle cells and fibroblasts in culture, is believed to play an important role in the formation of proliferative lesions of arterio-sclerosis. PDGF appears as three different dimeric isoforms: AA, AB, and BB. These were recently found to bind to two different receptors, the A/B receptor (which binds all three isoforms) and the B receptor (which binds only PDGF-BB). To find out whether these receptors exhibit functional differences, we have monitored the binding and mitogenic activities of PDGF-AA and -BB in human umbilical vein smooth muscle cells (HSMCs), human dermal fibroblasts (HFs), and Swiss mouse 3T3 cells. With each cell type, there was a good correlation between the maximal levels of DNA synthesis achieved by these isoforms and the numbers of the appropriate receptor present on the cell surface: HMSCs, which have at least 32,000 B receptors but only 8,000 A/B receptors, responded well to PDGF-BB but responded poorly to PDGF-AA; whereas Swiss 3T3 cells, which have about equal numbers of B and A/B receptors (70,000 and 90,000, respectively), responded equally well to both isoforms. PDGF-AB was a more efficacious mitogen of HSMCs and HFs than was PDGF-AA and inhibited [125I]-PDGF-BB binding to HSMCs more effectively than PDGF-AA. This indicates that there may exist a third PDGF receptor type to which PDGF-BB and -AB but not PDGF-AA can bind.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

J Cardiovasc Pharmacol

authors

Hosang M,Rouge M

subject

Has Abstract

pub_date

1989-01-01 00:00:00

pages

S22-6

eissn

0160-2446

issn

1533-4023

journal_volume

14 Suppl 6

pub_type

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