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• W1981546449 abstract "Recent studies of whole animal response have defined a role for circulating TGF-β in the preservation and stabilization of microvascular endothelial function (Lefer et al. [1993] Proc. Natl. Acad. Sci. U.S.A., 90:1018–1022; Pfister et al. [1992] J. Exp. Med., 176:265–269). In order to determine which TGF-β receptor types are responsible for this endothelial cell responsiveness, we used an affinity-labeling technique with 125I-TGF-β1 and -β2 to characterize TGF-β receptors on five different endothelial cell cultures: early passage bovine lung and rat epididymal fat pad microvascular endothelial cells (BLMEC and REEC), established endothelial cell lines from bovine adrenal medulla capillaries (EJG), fetal bovine heart (FBHE), and bovine pulmonary artery (CPAE). Since it is known that endothelial cells from different parts of the vasculature vary with respect to cell surface antigen expression (McCarthy et al. [1991] Trends Pharmacol. Sci., 12:462–467; Augustin et al. [1994] Bioessays, 16:901–906), it is important to compare TGF-β receptor expression on microvascular and macrovascular endothelial cells. We observed 85 kDa and 200–400 kDa labeled receptor bands and analyzed their relationship to the cloned Type II and III receptors using peptide antibodies. We used dithiothreitol and phosphoinositol-phospholipase C pretreatments to establish whether the 65 kDa labeled band which we observed corresponded to the Type I receptor or a glycophosphotidylinositol-linked binding protein. The results demonstrated that microvascular but not macrovascular endothelial cells express high levels of the Type III receptor. This differential expression of the Type III receptor indicates that distinct anatomical segments of the vasculature have distinct TGF-β receptor profiles. The presence of the Type III receptor on micro-but not macrovascular endothelial cells may account for the reportedly different potency of TGF-β1 and TGF-β2 on these two endothelial cell types. Analysis of the 85 kDa and 65 kDa affinity-labeled bands revealed that all the endothelial cells express the Type II receptor and a band consistent with the presence of a dithiothreitol-sensitive Type I receptor. Two isoform-specific phosphoinositol-phospholipase C releasable TGF-β binding proteins were also detected: a 60 kDa protein on one micro- (EJG) and one macro- (FBHE) vascular endothelial cell line and a 150/180 kDa protein on the macrovascular cell lines (FBHE and CPAE). These studies emphasize the heterogeneous nature of endothelial cells and underline the importance of using microvascular endothelial cells when examining TGF-β responses related to microvascular function. © 1995 Wiley-Liss Inc." @default.
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• W1981546449 date "1995-10-01" @default.
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• W1981546449 title "Transforming growth factor-? receptor expression on endothelial cells: Heterogeneity of type III receptor expression" @default.
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• W1981546449 doi "https://doi.org/10.1002/jcp.1041650123" @default.
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