Amyloid-b interacts with two cell surface receptors, CD36 and CD47, through which the matricellular protein thrombospondin-1 inhibits soluble guanylate cyclase activation. Here we examine whether amyloid-b shares this inhibitory activity. Amyloid-b inhibited both drug and nitric oxide-mediated activation of soluble guanylate cyclase in several cell types. Known cGMP-dependent functional responses to nitric oxide in platelets and vascular smooth muscle cells were correspondingly inhibited by amyloid-b. Functional interaction of amyloid-b with the scavenger receptor CD36 was indicated by inhibition of free fatty acid uptake via this receptor. Both soluble oligomer and fibrillar forms of amyloid-b were active. In contrast, amyloid-b did not compete with the known ligand SIRPa for binding to CD47. However, both receptors were necessary for amyloid-b to inhibit cGMP accumulation. These data suggest that amyloid-b interaction with CD36 induces a CD47-dependent signal that inhibits soluble guanylate cyclase activation. Combined with the pleiotropic effects of inhibiting free fatty acid transport via CD36, these data provides a molecular mechanism through which amyloid-b can contribute to the nitric oxide signaling deficiencies associated with Alzheimer's disease.
CITATION STYLE
Miller, T. W., Isenberg, J. S., Shih, H. B., Wang, Y., & Roberts, D. D. (2010). Amyloid-b inhibits no-cgmp signaling in a cd36- and cd47-dependent manner. PLoS ONE, 5(12). https://doi.org/10.1371/journal.pone.0015686
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