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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
biochemistry, genetics and molecular biology
Secreted phospholipase A2 inhibitors are also potent blockers of binding to the M-type receptor
Biochemistry, Volume 45, No. 44, Year 2006
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Description
Mammalian secreted phospholipases A2 (sPLA2s) constitute a family of structurally related enzymes that are likely to play numerous biological roles because of their phospholipid hydrolyzing activity and binding to soluble and membrane-bound proteins, including the M-type receptor. Over the past decade, a number of competitive inhibitors have been developed against the inflammatory-type human group IIA (hGIIA) sPLA2 with the aim of specifically blocking its catalytic activity and pathophysiological functions. The fact that many of these inhibitors, including the indole analogue Me-Indoxam, inhibit several other sPLA2s that bind to the M-type receptor prompted us to investigate the impact of Me-Indoxam and other inhibitors on the sPLA2-receptor interaction. By using a Ca 2+ loop mutant derived from a venom sPLA2 which is insensitive to hGIIA inhibitors but still binds to the M-type receptor, we demonstrate that Me-Indoxam dramatically decreases the affinity of various sPLA2s for the receptor, yet an sPLA2-Me-Indoxam-receptor complex can form at very high sPLA2 concentrations. Me-Indoxam inhibits the binding of iodinated mouse sPLA2s to the mouse M-type receptor expressed on live cells but also enhances binding of sPLA2 to phospholipids. Because Me-Indoxam and other competitive inhibitors protrude out of the sPLA2 catalytic groove, it is likely that the inhibitors interfere with the sPLA2-receptor interaction by steric hindrance and to different extents that depend on the type of sPLA2 and inhibitor. Our finding suggests that the various anti-inflammatory therapeutic effects of sPLA2 inhibitors may be due not only to inhibition of enzymatic activity but also to modulation of binding of sPLA2 to the M-type receptor or other as yet unknown protein targets. © 2006 American Chemical Society.
Authors & Co-Authors
Boilard, Eric
France, Valbonne
Institut de Pharmacologie Moléculaire et Cellulaire
Rouault, Morgane
France, Valbonne
Institut de Pharmacologie Moléculaire et Cellulaire
Surrel, Fanny
France, Valbonne
Institut de Pharmacologie Moléculaire et Cellulaire
Le Calvez, Catherine
France, Valbonne
Institut de Pharmacologie Moléculaire et Cellulaire
Bezzine, Sofiane
France, Valbonne
Institut de Pharmacologie Moléculaire et Cellulaire
Singer, Alan G.
United States, Seattle
University of Washington
Gelb, Michael H.
United States, Seattle
University of Washington
Lambeau, Gérard
France, Valbonne
Institut de Pharmacologie Moléculaire et Cellulaire
Statistics
Citations: 28
Authors: 8
Affiliations: 2
Identifiers
Doi:
10.1021/bi061376d
ISSN:
00062960