Characterization of GMP-140 (P-selectin) as a circulating plasma protein

doi:10.1084/jem.175.4.1147

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Characterization of GMP-140 (P-selectin) as a circulating plasma protein

LC Dunlop, MP Skinner, LJ Bendall, EJ Favaloro, PA Castaldi, JJ Gorman, JR Gamble, MA Vadas and MC Berndt
Baker Medical Research Institute, Prahran, Victoria, Australia.

GMP-140 is a 140-kD granule membrane protein, found in the alpha granules of platelets and the Weibel-Palade bodies of endothelial cells, that is surface expressed on cell activation and mediates neutrophil attachment. Cloning data for GMP-140 from an endothelial library predict a soluble form of the protein, the transcription message for which is also found in platelets. In this study, we report the detection by enzyme-linked immunosorbent assay of soluble GMP-140 in plasma centrifuged for 3 h at 100,000 g (to remove platelet microparticles) and confirm its identity by purification from plasma. Plasma concentrations were found to be 0.251 +/- 0.043 micrograms/ml (means +/- SD, n = 10) in normal male controls and 0.175 +/- 0.063 micrograms/ml (means +/- SD, n = 10) in normal female controls. The purified protein had an identical molecular mass (nonreduced) to platelet membrane GMP-140 (approximately 3 kD lower, reduced) and was immunoblotted by polyclonal anti-GMP-140, and the anti-GMP-140 monoclonal antibodies AK4 and AK6. Analytical gel filtration studies indicated that the plasma GMP-140 eluted as a monomer whereas detergent- free, platelet membrane GMP-140 eluted as a tetramer consistent with plasma GMP-140 lacking a transmembrane domain. Purified plasma GMP-140 bound to the same neutrophil receptor as the membrane-bound form, and when immobilized on plastic, bound neutrophils equivalently to immobilized platelet membrane GMP-140. Since it has been shown that fluid-phase GMP-140 is antiinflammatory and downregulates CD18- dependent neutrophil adhesion and respiratory burst, its presence in plasma may be of major importance in preventing the inadvertent activation of neutrophils in the circulation.
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