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The Journal of Cell Biology, Vol 111, Issue 6 3165-3176, Copyright © 1990 by The Rockefeller University Press


ARTICLES

Molecular cloning of a phosphatidylinositol-anchored membrane heparan sulfate proteoglycan from human lung fibroblasts

G David, V Lories, B Decock, P Marynen, JJ Cassiman and H Van den Berghe
Center for Human Genetics, University of Leuven, Belgium.

Two mAbs raised against the 64-kD core protein of a membrane heparan sulfate proteoglycan from human lung fibroblasts also recognize a nonhydrophobic proteoglycan which accumulates in the culture medium of the cells. Pulse-chase studies suggest that the hydrophobic cell- associated forms act as precursors for the nonhydrophobic medium- released species. The core proteins of the medium-released proteoglycans are slightly smaller than those of the hydrophobic cell- associated species, but the NH2-terminal amino acid sequences of both forms are identical. The characterization of human lung fibroblast cDNAs that encode the message for these core proteins and the effect of bacterial phosphatidylinositol-specific phospholipase C suggest that the hydrophobic proteoglycan is membrane-anchored through a phospholipid tail. These data identify a novel membrane proteoglycan in human lung fibroblasts and imply that the shedding of this proteoglycan may be related to the presence of the phospholipid anchor.
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