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The influence of group A streptococcal polysaccharide (A-PS) on the proliferation and functional activity of subpopulations CD4+ and CD8+ of human peripheral blood lymphocytes has been studied. As revealed in this study, A-PS, though having no mitogenic activity of its own, is capable of influencing the process of proliferation of two main T-cell subpopulations in the presence of PHA. Its action has a regulatory character and is manifested by the maintenance of the ration of lymphocytes CD4+ and CD8+ in the culture at a constant level (approximating 1). This effect is seemingly linked with changes in the functional activity of lymphocytes in both subpopulation CD4+ and subpopulation CD8+. The detected properties of A-PS make it possible to regard it as a pathogenic factor playing an important role in immunoregulatory disturbances in diseases connected with infection caused by group A streptococcus.
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