Secreted proteins of quiescent,serum-stimulated and over-confluent mouse embryo fibroblasts |
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Authors: | M Subramaniam G Shanmugam |
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Institution: | (1) Cancer Biology Division, School of Biological Sciences, Madurai Kamaraj University, 625 021 Madurai, India |
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Abstract: | Quiescent and proliferating cultures of Swiss mouse embryo fibroblasts were pulse labelled with 14C]-amino acids and the newly synthesized proteins that were secreted into the medium were resolved by electrophoresis on Polyacrylafde
gradient gels. Conditioned media obtained from quiescent cultures that were stimulated to grow by the addition of 20% fetal
calf serum showed the presence of two unique polypeptides of molecular weights 48000 and 26000. A polypeptide of molecular
weight 45000 was present in increased amounts in serum-stimulated cells than in quiescent cells. This protein was also superinduced
in quiescent cells by cycloheximide treatment. Mouse embryo fibroblasts grown under over-crowded conditions secreted two proteins
of molecular weights 35000 and 11000. The 35 K polypeptide was shown to be related to the major excreted protein of transformed
cells, since it was immunoprecipitated by an antiserum to major excreted protein. These results indicate that the 48 K and
26 K proteins may be proliferation specific proteins, while the 35 K protein present in the conditioned media of over-confluent
cells may be a marker of morphological transformation. |
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Keywords: | Mouse embryo fibroblasts secreted proteins |
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