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- W2336005878 abstract "The current study used the human Caco-2 cell line and mouse intestine to explore the topology of expression of the class B type I scavenger receptor (SR-BI) in intestinal cells. Results showed that intestinal cells expressed only the SR-BI isoform with little or no expression of the SR-BII variant. The expression of SR-BI in Caco-2 cells is differentiation dependent, with little or no expression in preconfluent undifferentiated cells. Analysis of Caco-2 cells cultured in Transwell porous membranes revealed the presence of SR-BI on both the apical and basolateral cell surface. Immunoblot analysis of mouse intestinal cell extracts demonstrated a gradation of SR-BI expression along the gastrocolic axis of the intestine, with the highest level of expression in the proximal intestine and decreasing to minimal expression levels in the distal intestine. Immunofluorescence studies with SR-BI-specific antibodies also confirmed this expression pattern. Importantly, the immunofluorescence studies also revealed that SR-BI immunoreactivity was most intense in the apical membrane of the brush border in the duodenum. The crypt cells did not show any reactivity with SR-BI antibodies. The localization of SR-BI in the jejunum was found to be different from that observed in the duodenum. SR-BI was present on both apical and basolateral surfaces of the jejunum villus. Localization of SR-BI in the ileum was also different, with little SR-BI detectable on either apical or basolateral membranes. Taken together, these results suggest that SR-BI has the potential to serve several functions in the intestine. The localization of SR-BI on the apical surface of the proximal intestine is consistent with the hypothesis of its possible role in dietary cholesterol absorption, whereas SR-BI present on the basolateral surface of the distal intestine suggests its possible involvement in intestinal lipoprotein uptake." @default.
- W2336005878 created "2016-06-24" @default.
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- W2336005878 date "2001-06-01" @default.
- W2336005878 modified "2023-10-13" @default.
- W2336005878 title "Differentiation-dependent expression and localization of the class B type I scavenger receptor in intestine" @default.
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- W2336005878 doi "https://doi.org/10.1016/s0022-2275(20)31613-8" @default.
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