Endocrine Abstracts

The cytoplasmic domains of EGF-like ligands have important biological functions. Stable transfectants of the human follicular thyroid carcinoma cell line FTC-133 over-expressing the cytoplasmic domain of proEGF (FTC-133-proEGFcyt) demonstrated a transcriptional up-regulation of the lysosomal hydrolases cathepsin- (cath-) B and -D and alterations in the processing of cath-L protein. Cath-L has strong elastinolytic activity and was the only of the three cathepsins to be secreted...

The cytoplasmic domain of the membrane-anchored human EGF proform is encoded by exons 22–24 and the function of this proEGFcyt is largely unkown. Stable transfectants of the human thyroid carcinoma (Ca) cell line FTC-133 were generated over-expressing (a) proEGFcyt, (b) truncated peptide version encoded by exons 22 and 23 (proEGF22.23), and (c) a natural splice version with a deletion of exon 23 and 24 (proEGFdel23). ProEGFcyt and proEGF22.23 transfectants, but not proEGF...