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Partial purification of a prostatic growth factor.

M T Story, S C Jacobs, R K Lawson

    The Journal of Urology
    |December 1, 1984
    PubMed
    Summary
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    Researchers isolated a prostatic growth factor from benign prostatic hyperplasia tissue using a 5-step fractionation process. This method leveraged the factor's size changes in varying salt concentrations to achieve significant purification.

    Area of Science:

    • Biochemistry
    • Urology
    • Molecular Biology

    Background:

    • Benign prostatic hyperplasia (BPH) is a common condition in aging men.
    • Understanding growth factors involved in BPH pathogenesis is crucial for developing targeted therapies.

    Purpose of the Study:

    • To isolate and partially purify a prostatic growth factor from human benign prostatic hyperplasia tissue.
    • To characterize the behavior of the growth factor under different ionic strength conditions.

    Main Methods:

    • A 5-step fractionation procedure was employed, including ammonium sulfate precipitation, gel filtration, and DEAE chromatography.
    • The procedure utilized the differential molecular size of the growth factor in low (0.05 M NaCl) versus high (1.55 M NaCl) ionic strength buffers.
    • Growth factor activity was monitored throughout the fractionation process.

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    Main Results:

    • The fractionation procedure yielded a greater than 200-fold increase in prostatic growth factor activity.
    • A recovery of 10% of the initial growth factor activity was achieved.
    • The growth factor exhibited a significant change in apparent molecular size depending on the ionic strength of the buffer.

    Conclusions:

    • A robust 5-step fractionation method was established for the partial purification of a prostatic growth factor.
    • The results indicate the prostatic growth factor exists as a large aggregate in low salt and dissociates into smaller units in high salt.
    • Further purification steps are necessary to obtain homogeneous prostatic growth factor for detailed characterization.