Lamins A and C appear during retinoic acid-induced differentiation of mouse embryonal carcinoma cells

doi:10.1083/jcb.105.3.1099

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Lamins A and C appear during retinoic acid-induced differentiation of mouse embryonal carcinoma cells

S Lebel, C Lampron, A Royal and Y Raymond
Institut du Cancer de Montreal, Hopital Notre-Dame, Quebec, Canada.

The lamin complement of nuclear matrix isolated from F9 embryonal carcinoma cells was studied during retinoic acid-induced differentiation in culture. Differentiation of the original cells into parietal endoderm-like cells was accompanied by the gradual appearance of lamins A and C while lamin B was present throughout all stages. Lamins were identified by their molecular masses, isoelectric points, recognition by a monoclonal antibody and a polyclonal antiserum, and by peptide mapping. The increase in the amounts of lamins A and C found in the matrix was due to de novo synthesis as no extranuclear pools of these lamins were detected in the undifferentiated cells. These results provide biochemical evidence that, as in amphibian embryogenesis, there are variations in nuclear lamina composition during mammalian development.
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