GFP is secreted via a non-classical pathway in CHO cells.

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GFP is secreted via a non-classical pathway in CHO cells. GFP is secreted via a non-classical pathway in CHO cells. (A) Untransfected CHO cells (Ctrl) and cells transiently transfected with either GFP (GFP) or preprolactin-myc (PPL) were labeled with [35S]-methionine and chased for 6 hours. The cell lysates (C) and media (M) were subjected to immunoprecipitation with either antibodies against GFP (lanes 1-8) or myc (lanes 9-12), and the washed immunoprecipitates were displayed by SDS-PAGE and fluorography. Some cells (+BFA) were treated with 1 μg/ml brefeldin A for 1 hour prior to labeling (lanes 3-4, 7-8 and 11-12). `% Sec.' denotes the percentage of secretion of GFP into the media as determined by a phosphorimager. (B) CHO cells transfected with plasmids encoding either mouse dihydrofolate reductase (mDHFR) or Schistosoma japonicum glutathione S-transferase (GST) both tagged with the FLAG epitope. The cells were labeled with [35S]-methionine and chased in serum-free medium. The cell lysate (C) and media (M) were immunoprecipitated with anti-FLAG antibodies and processed as above. (C) Plasmids coding for mDHFR and GFP were used to co-transfect CHO cells. The cells were labeled, chased and processed as described in B. Marcel Tanudji et al. J Cell Sci 2002;115:3849-3857 © The Company of Biologists Limited 2002