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The involvement of caveolae in the internalization of A 1 adenosine receptors (A 1 R) and the receptor sorting and recycling was studied in the smooth muscle cell line DDT 1 MF-2, by binding assays, by confocal microscopy, and at the structural level. The use of cholera toxin-binding subunit adsorbed to gold as a specific probe for labeling the ganglioside GM 1 and...
HIV-1 external envelope glycoprotein gp120 inhibits adenosine deaminase (ADA) binding to its cell surface receptor in lymphocytes, CD26, by a mechanism that does not require the gp120–CD4 interaction. To further characterize this mechanism, we studied ADA binding to murine clones stably expressing human CD26 and/or human CD4, and transiently expressing human CXCR4. In this heterologous model, we show...
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