Abstract
The proliferation and differentiation of astrocytes are fundamental events in the normal development and function of the central nervous system (CNS), and may also contribute to the pathogenesis of a number of neurological diseases. Products of T lymphocytes can stimulate proliferation of astrocytes, but the nature of the T lymphocyte-derived molecule(s) responsible for this response is unknown. The present study was undertaken to examine several well-characterized T lymphocyte-derived factors for their ability to stimulate cultured primary rat astrocytes. While recombinant human interleukin-2 (IL-2), interleukin-3 (IL-3), interleukin-4 (IL-4), interleukin-5 (IL-5), interleukin-6 (IL-6), and rat or human recombinant interferon-gamma (IFN-gamma) have no proliferative effect on astrocytes, a human T cell-derived B cell growth factor (BCGF) does. This BCGF, termed 2B11, had previously been characterized by its ability to enhance the proliferation of anti-mu-stimulated human B cells, while not influencing B cell immunoglobulin synthesis. High performance liquid chromatography (HPLC)-purified 2B11-BCGF (MW approximately 20,000 daltons) stimulates the proliferation of astrocytes in a dose-dependent fashion. Purified 2B11-BCGF also in...Continue Reading
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