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• W1878751754 abstract "This study shows that the lateral mobility of CD4, an important plasma-membrane immune receptor, can be modulated by intracellular application of an anti-CD4 antibody. For this purpose, (i) full-length CD4 and a truncated CD4 mutant, lacking a 32-residue-long C-terminal intracellularly exposed domain, were expressed in Spodoptera frugiperda (Sf9) insect cells, (ii) a monoclonal antibody, C6, with specificity for the C-terminal domain was generated, and (iii) a versatile apparatus for fluorescence microphotolysis (FM) studies was constructed. By these means it was found that the commercial anti-CD4 antibody Leu3a-PE, in contrast with several other anti-CD4 antibodies, could be used as a fluorescent label of CD4 without interfering greatly with CD4 mobility. Labelled by Leu3a-PE, full-length CD4 had a lateral diffusion coefficient of D = (4.7 +/- 1.9) x 10(-10) cm2/s and a mobile fraction of fm = 80 +/- 16% (room temperature). Within experimental accuracy the truncated CD4 had the same mobility as full-length CD4. Introduction of the C6 antibody into Sf9 cells by microinjection or by fusion with C6-loaded liposomes decreased the mobility of full-length CD4 (fm = 40%) but not of truncated CD4 (fm = 80%). Treatment of Sf9 cells with phorbol ester also reduced the mobility of full-length CD4 (fm = 50%) but not truncated CD4 (fm = 90%). A calmodulin inhibitor but not a protein kinase C (PKC) inhibitor abolished the phorbol ester effect." @default.
• W1878751754 created "2016-06-24" @default.
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• W1878751754 date "1995-11-15" @default.
• W1878751754 modified "2023-09-27" @default.
• W1878751754 title "Modulation of CD4 lateral mobility in intact cells by an intracellularly applied antibody" @default.
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• W1878751754 doi "https://doi.org/10.1042/bj3120251" @default.
• W1878751754 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1136252" @default.
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• W1878751754 hasPublicationYear "1995" @default.
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