Presence of a Tetrahymena growth promoting activity in fetal bovine serum |
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Authors: | Hiroshi Hosoya Tatsuhiko Matsuoka Natsumi Hosoya Tadao Takahashi Toshikazu Kosaka |
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Institution: | Department of Biological Science, Faculty of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739.;School of Social Information Studies, Otsuma Women's University, Tama, Tokyo 206, Japan. |
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Abstract: | Treatment of cultures of the ciliate Tetrahymena with fetal bovine serum (FBS) enhanced the rate of cell proliferation. The growth promoting activity was partially purified from FBS as a high Mr complex including four components with apparent Mr values of 180 kDa, 68 kDa, 60 kDa and 30 kDa by a 4-step procedure. The 180 kDa component was identified by amino acid sequencing as α2-macroglobulin. The addition of purified α2-macroglobulin from bovine plasma to cultures of Tetrahymena was also found to enhance the rate of cell proliferation. This report is the first dealing with the direct identification of a mammalian factor which promotes the growth of free-living protozoa. |
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Keywords: | α2-macroglobulin FBS growth promoting activity Tetrahymena |
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