Isolation and partial molecular characterization of heat-stable growth factor from human placenta.
A heat-stable growth factor has been purified to homogeneity from human placenta. Purification procedure involved extraction with acidic medium, precipitation using ethanol, DE-52 ion-exchange chromatography, and reversed-phase HPLC. The purified preparation has been named human placental growth factor-1 (HPGF-1), which simulates the proliferation of some cell lines, such as human amniotic cell, mouse marrow tumor cell, and mouse fibroblast cell. The growth factor has an approximate molecular weight of 1 900. It is a glycopeptide which contains a polypeptide chain consisting of 10 amino acid residues with molecular weight of 1 195. The N-terminal residue of the polypeptide chain part is phenylalanine. The molecular weight of non-peptide part is 682. The isoelectric point of the growth factor is pI 6.8.
Fang
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Department of Biological Science and Biotechnology, Tsinghua University, Beijing, China.
Wang
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Luo
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Zhou
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