Suppression of SNX2 or the joint suppression of SNX2 and SNX1 has no gross affect on EGF or transferrin receptor sorting. Suppression of SNX2 or the joint.

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Review question: endocytosis / desensitization of receptors

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Suppression of SNX2 or the joint suppression of SNX2 and SNX1 has no gross affect on EGF or transferrin receptor sorting. Suppression of SNX2 or the joint suppression of SNX2 and SNX1 has no gross affect on EGF or transferrin receptor sorting. (A) HeLa cells were treated with either control, SNX2-specific siRNA or jointly with SNX1- and SNX2-specific siRNA duplexes for 72 hours. Cells were serum-starved for 3 hours and labelled with 1 kBq per well 125I-EGF for 1 hour at 4°C, allowed to internalise surface bound 125I-EGF for 5 minutes at 37°C, and then returned to 4°C. Cells were chased into 100 ng/ml cold EGF-containing media for various times at 37°C. Recycled, degraded and internalised fractions were subjected to gamma counting. Data is the average±s.d. from three independent experiments. (B) HeLa cells were treated with control, SNX2-specific siRNA or jointly with SNX1- and SNX2-specific siRNA duplexes for 72 hours. Cells were serum-starved for 3 hours and labelled with 1 kBq per well 125I-transferrin for 60 minutes at 37°C. Cells were chased into 50 μg/ml cold transferrin-containing media for various times at 37°C. Recycled, degraded and internalised fractions were subjected to gamma counting. Data is the average±s.d. from three independent experiments. (C) Western analysis of a typical SNX1 and SNX2 suppression achieved during one of the three sets of receptor trafficking assays. Jez G. Carlton et al. J Cell Sci 2005;118:4527-4539 © The Company of Biologists Limited 2005