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Journal of Cell Science, Vol 107, Issue 3 353-366, Copyright © 1994 by Company of Biologists

JOURNAL ARTICLES

Cytolocation of prosome antigens on intermediate filament subnetworks of cytokeratin, vimentin and desmin type

M Olink-Coux, C Arcangeletti, F Pinardi, R Minisini, M Huesca, C Chezzi and K Scherrer
Institut Jacques Monod, CNRS, Universite Paris 7, France.

Analysis by double-label indirect immunofluorescence of PtK1 and HeLa cells had previously demonstrated that prosome* antigens form networks that superimpose on those of the intermediate filaments of the cytokeratin type. We show here that in PtK1 cells various prosomal antigens also reside to a variable extent on intermediate filaments subnetworks of the vimentin type. In proliferating human fibroblasts the prosome and vimentin networks were found to coincide, while in proliferating myoblasts of the C2.7 mouse myogenic cell line the prosomal antigens seem to superimpose on the intermediate filaments of the desmin type. Thus, the prosomes, which are RNP particles of variable composition and subcomplexes of untranslated mRNP, and carry a multicatalytic proteinase activity, seem to co-localize with the specific kind of cytoplasmic intermediate filament in relation to the cell type. These results, which generalize the previous data, are discussed in view of possible role(s) for prosomes in mRNA metabolism and/or intermediate filaments remodelling.
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© The Company of Biologists Ltd 1994