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• W1973225013 abstract "Vascular disease is multifactorial and smooth muscle cells (SMCs) play a key role. Retinoids have been shown to influence many disease-promoting processes including proliferation and differentiation in the vessel wall. Phenotypic heterogeneity of vascular SMCs is a well-known phenomenon and phenotypic modulation of SMCs precedes intimal hyperplasia. The SMCs that constitute the intimal hyperplasia demonstrate a distinct phenotype and differ in gene expression compared to medial SMCs. Cellular retinol-binding protein-1 (CRBP-I), involved in retinoid metabolism, is highly expressed in intimal SMCs, indicating altered retinoid metabolism in this subset of cells. The aim of this study was to evaluate the metabolism of all-<i>trans</i> ROH (atROH), the circulating prohormone to active retinoids, in vascular SMCs of different phenotypes. The results show an increased uptake of atROH in intimal SMCs compared to medial SMCs as well as increased expression of the retinoid-metabolizing enzymes retinol dehydrogenase-5 and retinal dehydrogenase-1 and, in conjunction with this gene expression, increased production of all-<i>trans</i> retinoic acid (atRA). Furthermore, the retinoic acid-catabolizing enzyme CYP26A1 is expressed at higher levels in medial SMCs compared to intimal SMCs. Thus, both retinoid activation and deactivation processes are in operation. To analyze if the difference in ROH metabolism was also correlated to differences in the biological response to retinol, the effects of ROH on proliferation of SMCs with this phenotypic heterogeneity were studied. We found that intimal SMCs showed a dose- and time-dependent growth inhibition when treated with atROH in contrast to medial SMCs, in which atROH had a mitogenic effect. This study shows, for the first time, that (1) vascular SMCs are able to synthesize biologically active atRA from the prohormone atROH, (2) intimal SMCs have a higher capacity to internalize atROH and metabolize atROH into atRA compared to medial SMCs and (3) atROH inhibits growth of intimal SMCs, but induces medial SMC growth." @default.
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• W1973225013 date "2006-01-01" @default.
• W1973225013 modified "2023-10-10" @default.
• W1973225013 title "Differences in Retinol Metabolism and Proliferative Response between Neointimal and Medial Smooth Muscle Cells" @default.
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• W1973225013 doi "https://doi.org/10.1159/000094415" @default.
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