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- W4236688147 abstract "To explore potential inter-receptor interactions between Fc gamma RIIIB, a GPI-linked protein, and the leukocyte integrin CR3, we have prepared transfected 3T3 fibroblast cell lines expressing Fc gamma RIIIB, CR3, or both Fc gamma RIIIB and CR3. We test the hypothesis that Fc gamma RIIIB and CR3 are physically associated in membranes using fluorescence recovery after photobleaching (FRAP) and resonance energy transfer (r.e.t.) microscopy. Cells expressing Fc gamma RIIIB alone displayed a diffusion coefficient (D) of 3.4 x 10(-9) (+/- 2.9 x 10(-9) cm2/second and a mobile fraction (m.f.) of 0.73 (+/- 0.10). In contrast, Fc gamma RIIIB exhibited D = 2.5 x 10(-9) (+/- 1.4 x 10(-9) cm2/second (n.s.) and a m.f. of 0.48 (+/- 0.08) (p < 0.01) on cells expressing both Fc gamma RIIB and CR3, thus indicating that co-expression of CR3 constrains the lateral diffusion of Fc gamma RIIIB. To further test for a direct physical interaction between these gene products, (r.e.t.) microscopy was performed. Donor-labeled anti-CR3 and acceptor-labeled anti-Fc gamma RIIIB on cells expressing both receptors yielded a r.e.t. photon count rate of 8.9(+/- 6.4) kilocounts/second (kC/s), whereas CR3-to-CR3 measurements gave 1.6(+/- 0.6) kC/s (p < 0.01). Moreover, the addition of exogenous agents such as N-acetyl-D-glucosamine, but not indomethacin, diminished the magnitude of these interactions in transfectant membranes. These data support the notion that a subpopulation of Fc gamma RIIIB is physically associated with CR3 and that this association can be affected by exogeneous compounds." @default.
- W4236688147 created "2022-05-12" @default.
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- W4236688147 date "1995-04-07" @default.
- W4236688147 modified "2023-09-26" @default.
- W4236688147 doi "https://doi.org/10.1006/jmbi.1995.0166" @default.
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