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Murine teratocarcinoma embryoid bodies are thought to mimic certain events linked to early embryonic development, and these multicellular aggregates are considered good models for studying cellular differentiation processes. The ascitic form of CE44 embryonal carcinoma is formed by a heterogeneous population of cells that morphologically resemble morules and early blastocysts (for review see Martin, 1975., Damjanov, I., 1990). One of the most important features of the embryogenes is the presence of fibronectin, a protein that is expressed during differentiation and morphogenic processes and which has been specifically identified as being responsible for parietal endoderm differentiation and growth (Grabel and Watts, 1987). Flow cytometry is used to recognize characteristics such as size, granularity and the presence of specific markers among cell populations In the present study we have combined flow cytometry and morphoiogical methods to evaluate the differentiation capacity of embryoid bodies multicellular aggregates. Thus we have quantified fibronectin expression in CE44 teratocarcinoma embryoid bodies cultured in the presence and absence of powerful differentiation inductors such as retinoic acid (RA) and dibutyryl cyclic AMP (dbcAMP)

Multiparametric analysis of cell differentiation in teratocarcinoma embryoid bodies.