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Biological characterization of an acid-sensitive growth factor from human platelets: role in the proliferation of human melanoma and bovine endothelial cells.
Abstract
An acid-sensitive growth factor for human melanoma has been partially purified from human platelets. TSK gel filtration HPLC provides a molecular weight estimation of 60,000 daltons. This factor is not only mitogenic for human melanoma, but also stimulates 3H-thymidine uptake and increases the number of bovine aortic endothelial cells, while fibroblasts are nonresponsive. Radioiodination of active HPLC fraction has been accomplished. The human melanoma cell line, M1RW5 demonstrates specific, time-dependent binding of the labeled protein. These studies suggest that the growth of human melanoma may in part be regulated by a newly described growth factor present in human platelets.
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