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• W1527891330 abstract "We have characterized two high affinity acidic fibroblast growth factor (aFGF) receptors in a rat parathyroid cell line (PT-r). Affinity labeling with 125I-aFGF showed that these two receptors, apparent molecular masses, 150 and 130 kDa, respectively, display higher affinity for aFGF than for bFGF. The 150-kDa receptor bears a heparan sulfate chain(s), demonstrated by a decrease in size of 15-20 kDa with heparitinase digestion after affinity labeling. Heparitinase digestion before affinity labeling markedly reduced the intensity of the 150 kDa species. Scatchard analysis showed two different high affinity binding sites (Kd of 3.9 pM with 180 sites/cell and Kd of 110 pM with 5800 sites/cell). The higher affinity site was completely eliminated by digestion with heparitinase before adding labeled aFGF; the lower affinity site was unaffected. In ion exchange chromatography after metabolic labeling of the cells with [3H]glucosamine and affinity labeling with 125I-aFGF, the larger receptor-ligand complex, 165 kDa, eluted with approximately 0.5 M NaCl, typical eluting conditions for heparan sulfate proteoglycans. Both of the receptor-ligand complexes were smaller on sodium dodecyl sulfate-polyacrylamide gel electrophoresis than two major heparan sulfate proteoglycans, HSPG I and II, which we characterized in this cell line previously (Yanagishita, M., Brandi, M. L., and Sakaguchi, K. (1989) J. Biol. Chem. 264, 15714-15720). Both receptors have similar N-linked oligosaccharide and sialic acid contents, shown by analysis of affinity-labeled receptors upon digestion with glycopeptidase F and with neuraminidase. All together, these results suggest that PT-r cells bear two distinct high affinity receptors for aFGF, a 150-kDa receptor which is a heparan sulfate proteoglycan and another that is a glycoprotein. The heparan sulfate glycosaminoglycan moiety of the 150- kDa receptor is critical for high affinity binding of aFGF. These findings contrast with current concepts derived from other systems, suggesting that heparan sulfate glycosaminoglycans/proteoglycans function as a reservoir source for FGF or as a group of low affinity binding sites." @default.
• W1527891330 created "2016-06-24" @default.
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• W1527891330 date "1991-04-01" @default.
• W1527891330 modified "2023-09-27" @default.
• W1527891330 title "Identification of heparan sulfate proteoglycan as a high affinity receptor for acidic fibroblast growth factor (aFGF) in a parathyroid cell line." @default.
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• W1527891330 doi "https://doi.org/10.1016/s0021-9258(20)89640-9" @default.
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• W1527891330 hasPublicationYear "1991" @default.
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