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PDGF-stimulated cyclic AMP formation in airway smooth muscle: assessment of the roles of MAP kinase, cytosolic phospholipase A2, and arachidonate metabolites.

Abstract：

:Platelet-derived growth factor (PDGF) stimulates cyclic AMP (cAMP) synthesis in cultured guinea-pig airway smooth muscle (ASM) cells. However, this stimulation is normally countered by the action of cAMP phosphodiesterases. Thus, cAMP synthesis was observed only in cells pre-treated with either 3-isobutyl-1-methylxanthine (IBMX) or with cholera toxin. cAMP synthesis was inhibited by pre-treating cells with well-defined inhibitors of arachidonate metabolite synthesis, such as AACOCF3 [a cytosolic phospholipase A2 (cPLA2) inhibitor] and indomethacin (a cyclooxygenase inhibitor). This suggests that arachidonate metabolites (e.g., prostaglandins) released in response to PDGF stimulate cAMP synthesis. The presence of functional prostaglandin (PG) receptors was confirmed by experiments that showed that exogenous PGE2 stimulated cAMP formation. cPLA2 is regulated by mitogen-activated protein kinase (MAPK) in a number of cell types. The presence of this pathway in ASM cells and its role in regulating arachidonate metabolism were supported by the finding that pre-treatment of cells with PD098059 (an inhibitor of mitogen-activated protein kinase kinase-1 activation) reduced PDGF-stimulated cAMP synthesis. The cAMP formed in response to the arachidonate metabolites subsequently reduced the PDGF-dependent activation of c-Raf, MAPK, and DNA synthesis, suggesting the presence of a negative feedback pathway.

journal_name

Cell Signal

journal_title

Cellular signalling

authors

Pyne NJ,Pyne S

doi

10.1016/s0898-6568(97)00138-1

subject

Has Abstract

pub_date

1998-05-01 00:00:00

pages

363-9

issue

5

eissn

0898-6568

issn

1873-3913

pii

S0898-6568(97)00138-1

journal_volume

10

pub_type

杂志文章

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