Anno2009
AutoriMagnone M, Bruzzone S, Guida L, Damonte G, Millo E, Scarfì S, Usai C, Sturla L, Palombo D, De Flora A, Zocchi E
AbstractAbscisic acid (ABA) is a phytohormone recently identified as a new endogenous pro-inflammatory hormone in human granulocytes. Here we report the functional activation of human monocytes and vascular smooth muscle cells by ABA. Incubation of monocytes with ABA evokes an intracellular Ca2+ rise through the second messenger cyclic ADP-ribose, leading to NF-kappaB activation and consequent increase of cyclooxygenase-2 expression and prostaglandin E2 production and enhanced release of MCP-1 (monocyte chemoattractant protein-1) and of metalloprotease-9, all events reportedly involved in atherogenesis. Moreover, monocytes release ABA when exposed to thrombin-activated platelets, a condition occurring at the injured vascular endothelium; monocyte-derived ABA behaves as an autocrine and paracrine pro-inflammatory hormone-stimulating monocyte migration and MCP-1 release, as well as vascular smooth muscle cells migration and proliferation. These results, and the presence of ABA in human arterial plaques at a 10-fold higher concentration compared with normal arterial tissue, identify ABA as a new signal molecule involved in the development of atherosclerosis and suggest a possible new target for anti-atherosclerotic therapy.
RivistaJournal Of Biological Chemistry
ISSN0021-9258
Impact factor5.328
Volume284
Pagina inizio17808
Pagina fine17818
Autori IBFCesare USAI
Linee di Ricerca IBFMD.P01.001.001
Sedi IBFIBF.GE