Abstract
Insect hemolymph coagulation involves a complex reaction with contributions from hemocytes and soluble factors. Here we present evidence for the presence of microparticles in the coagulation reaction. These particles are formed by hemocytes in a calcium-dependent process. Both the particles and the remaining cells are labelled by annexin V indicating the presence of phosphatidylserine on the outer membrane. Microparticles are enriched in hemomucin, a surface protein of Drosophila hemocytes that is specifically recognised by a snail ( Helix pomatia) lectin. Hemomucin is shown to bind to lipophorin, a multifunctional hemolymph molecule previously implied in coagulation. Our findings suggest similarities at a biochemical and cellular level between vertebrate blood and insect hemolymph coagulation.
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