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Partial purification and characterization of a growth factor from human hyperplastic prostatic tissues

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Summary

A growth factor capable of stimulating DNA synthesis of Balb/c 3T3 cells was purified by heparin-Sepharose column chromatography about 1900-fold from the cytosol of human prostatic tissues obtained at autopsy or open prostatectomy. This growth factor bound to heparin-Sepharose in the presence of 0.5 mol/l NaCl and was eluted by 1.0–1.55 mol/l NaCl. Its molecular weight was estimated to be 68000 by SDS-polyacrylamide gel electrophoresis. The amino acid composition was determined and compared with the data of other growth factors, which revealed no striking conformity. Distribution of growth factor activity was investigated in mechanically separated prostatic tissues of benign prostatic hyperplasia. The separation scheme provided two fractions: the stromal fraction consisting mainly of fibroblasts, fibers and smooth muscle, and the epithelial fraction consisting of epithelial cells. The specific growth-stimulating activity in the stromal fraction was about 2-fold that in the epithelial fraction. Referred to the total activity of whole tissue, about 74% of the activity could be detected in the stromal fraction, while only about 5% was detectable in the epithelial fraction. This study demonstrates the existence of a growth factor in human benign hyperplastic prostatic tissues, showing a remarkable distribution of growth factor activity, which may play a role in the pathogenesis of benign prostatic hyperplasia.

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Authors and Affiliations

  1. Institute of Physiological Chemistry, Ruhr-University Bochum, Bochum, FRG

    A. Dignaß & A. W. Holldorf

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  1. A. Dignaß
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  2. A. W. Holldorf
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Dignaß, A., Holldorf, A.W. Partial purification and characterization of a growth factor from human hyperplastic prostatic tissues. Urol. Res. 20, 133–138 (1992). https://doi.org/10.1007/BF00296525

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  • DOI: https://doi.org/10.1007/BF00296525

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