Uridine adenosine tetraphosphate (Up{sub 4}A) is a strong inductor of smooth muscle cell migration via activation of the P2Y{sub 2} receptor and cross-communication to the PDGF receptor
- Charite - Universitaetsmedizin Berlin, ChariteCentrum 13, Department of Nephrology, Campus Benjamin Franklin, Hindenburgdamm 30, 12203 Berlin (Germany)
Highlights: Black-Right-Pointing-Pointer Up{sub 4}A induces VSMC migration. Black-Right-Pointing-Pointer VSMC migration towards Up{sub 4}A involves P2Y{sub 2} activation. Black-Right-Pointing-Pointer Up{sub 4}A-induced VSMC migration is OPN-dependent. Black-Right-Pointing-Pointer Activation of ERK1/2 pathway is necessary for VSMC migration towards Up{sub 4}A. Black-Right-Pointing-Pointer Up{sub 4}A-directed VSMC migration cross-communicates with the PDGFR. -- Abstract: The recently discovered dinucleotide uridine adenosine tetraphosphate (Up{sub 4}A) was found in human plasma and characterized as endothelium-derived vasoconstrictive factor (EDCF). A further study revealed a positive correlation between Up{sub 4}A and vascular smooth muscle cell (VSMC) proliferation. Due to the dominant role of migration in the formation of atherosclerotic lesions our aim was to investigate the migration stimulating potential of Up{sub 4}A. Indeed, we found a strong chemoattractant effect of Up{sub 4}A on VSMC by using a modified Boyden chamber. This migration dramatically depends on osteopontin secretion (OPN) revealed by the reduction of the migration signal down to 23% during simultaneous incubation with an OPN-blocking antibody. Due to inhibitory patterns using specific and unspecific purinoreceptor inhibitors, Up{sub 4}A mediates it's migratory signal mainly via the P2Y{sub 2}. The signaling behind the receptor was investigated with luminex technique and revealed an activation of the extracellular signal-regulated kinases 1 and 2 (ERK1/2) pathway. By use of the specific PDGF receptor (PDGFR) inhibitor AG1296 and siRNA technique against PDGFR-{beta} we found a strongly reduced migration signal after Up{sub 4}A stimulation in the PDGFR-{beta} knockdown cells compared to control cells. In this study, we present substantiate data that Up{sub 4}A exhibits migration stimulating potential probably involving the signaling cascade of MEK1 and ERK1/2 as well as the matrix protein OPN. We further suggest that the initiation of the migration process occurs predominant through direct activation of the P2Y{sub 2} by Up{sub 4}A and via transactivation of the PDGFR.
- OSTI ID:
- 22207662
- Journal Information:
- Biochemical and Biophysical Research Communications, Vol. 417, Issue 3; Other Information: Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0006-291X
- Country of Publication:
- United States
- Language:
- English
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