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Heparin releasable and nonreleasable forms of heparan sulfate proteoglycan are found on the surfaces of cultured porcine aortic endothelial cells

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Abstract

Evidence suggests that endothelial cell layer heparan sulfate proteoglycans include a variety of different sized molecules which most likely contain different protein cores. In the present report, approximately half of endothelial cell surface associated heparan sulfate proteoglycan is shown to be releasable with soluble heparin. The remaining cell surface heparan sulfate proteoglycan, as well as extracellular matrix heparan sulfate proteoglycan, cannot be removed from the cells with heparin. The heparin nonreleasable cell surface proteoglycan can be released by membrane disrupting agents and is able to intercalate into liposomes. When the heparin releasable and nonreleasable cell surface heparan sulfate proteoglycans are compared, differences in proteoglycan size are also evident. Furthermore, the intact heparin releasable heparan sulfate proteoglycan is closer in size to proteoglycans isolated from the extracellular matrix and from growth medium than to that which is heparin nonreleasable. These data indicate that cultured porcine aortic endothelial cells contain at least two distinct types of cell surface heparan sulfate proteoglycans, one of which appears to be associated with the cells through its glycosaminoglycan chains. The other (which is more tightly associated) is probably linked via a membrane intercalated protein core.

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Abbreviations

ECM:

extracellular matrix

HSPG:

heparan sulfate proteoglycan

PAE:

porcine aortic endothelial

PBS:

phosphate buffered saline

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Authors and Affiliations

  1. Department of Chemistry, Lehigh University, Mountaintop Campus, Iacocca Building, 18015, Bethlehem, PA, USA

    Linda J. Lowe-Krentz, Kelly Thompson & Walter A. Patton II

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  1. Linda J. Lowe-Krentz
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  2. Kelly Thompson
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  3. Walter A. Patton II
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Lowe-Krentz, L.J., Thompson, K. & Patton, W.A. Heparin releasable and nonreleasable forms of heparan sulfate proteoglycan are found on the surfaces of cultured porcine aortic endothelial cells. Mol Cell Biochem 109, 51–60 (1992). https://doi.org/10.1007/BF00230873

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  • DOI: https://doi.org/10.1007/BF00230873

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