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PAF and haematopoiesis. X. Macrophage colony-stimulating factor and granulocyte macrophage colony-stimulating factor enhance platelet-activating factor acetylhydrolase production by human blood-derived macrophages

Platelet-activating factor (PAF), a phospholipid autacoid with potent regulatory functions, is synthesized by stimulated monocytes. Macrophages are a source of the plasma acetylhydrolase activity (AHA) which regulates PAF concentrations. Granulocyte-macrophage colony-stimulating factor (GM-CSF) and macrophage colony-stimulating factor (M-CSF) are involved in the differentiation and functions of cells from the monocytec/macrophagic lineage. This work reports that M-CSF and GM-CSF stimulated AHA production by human blood monocyte-derived macrophages in a time- and dose-dependent manner. After 7 days of culture without serum, a 6- and 4-fold increase was found in cells treated with M-CSF (1000 U/ml) and GM-CSF (50 ng/ml), respectively. M-CSF (up to 1000 U/ml) and GM-CSF (up to 10 ng/ml) did not induce PAF production by human blood monocytes. While GM-CSF (10 ng/ml) and interleukin-1 (10 enhance AHA production by human blood-derived macrophages cultured in low serum concentrations. Clearly the effects of growth factors on AHA production in vivo deserve to be assessed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Biochimica et Biophysica Acta (BBA) - Molecular Cell Research Elsevier

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