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Thromb Haemost 1989; 61(03): 454-458
DOI: 10.1055/s-0038-1646613
Original Article
Schattauer GmbH Stuttgart

Binding of Tissue Plasminogen Activator to Cultured Human Fibroblasts

Thomas M Reilly
The E. I. duPont de Nemours and Company (Inc.), Medical ftoducts Department, Division of Cardiovascular Diseases, Experimental Station, E400/3213, Wilmington, DE, USA
,
Mark D Whitfield
The E. I. duPont de Nemours and Company (Inc.), Medical ftoducts Department, Division of Cardiovascular Diseases, Experimental Station, E400/3213, Wilmington, DE, USA
,
David S Taylon
The E. I. duPont de Nemours and Company (Inc.), Medical ftoducts Department, Division of Cardiovascular Diseases, Experimental Station, E400/3213, Wilmington, DE, USA
,
Pieter B M W M Timmermans
The E. I. duPont de Nemours and Company (Inc.), Medical ftoducts Department, Division of Cardiovascular Diseases, Experimental Station, E400/3213, Wilmington, DE, USA
› Author Affiliations
Further Information

Publication History

Received 22 June 1988

Accepted after revision 20 January 1989

Publication Date:
24 July 2018 (online)

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Summary

The binding of 125I-labeled, one-chain tissue plasminogen activator (t-PA) by WI-38 cultured human lung fibroblasts was investigated. Binding of t-PA to WI-38 monolayers was specific, saturable and temperature dependent. One and two-chain t-PAs were comparable in their ability to compete with 125I-labeled, one- chain t-PA for binding to fibroblasts, while no inhibition of binding was observed with a 500-fold molar excess of urokinase. Studies with various compounds suggest that neither the catalytic site, the fibrin binding site, nor the carbohydrate moieties on t-PA are involved in its binding to WI-38 cells. At higher temperatures, the amount of cell-bound 125I-t-PA that was removed by either incubation in binding buffer containing an excess of unlabeled t-PA, or by brief treatment with acidic buffer, was small (approximately 20%) suggesting that much of the t-PA is internalized. Electrophoretic analysis of extracts prepared from cells that had been incubated with 125I-t-PA revealed the presence of a major band of 70,000 Mr, which corresponds to intact t-PA. Our results suggest that WI-38 fibroblasts are capable of binding and internalizing t-PA, and that these processes involve a receptor site specific for t-PA.

Keywords

Plasminogen - Type plasminogen activator - WI - 38 human fibroblasts - Binding
 

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