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Structural analogs of the hexapeptide sequence 54-59 (A) human casein, reported to stimulate immune response, were synthesized and evaluated for immunostimulant activity. Hexapeptide 91/409 (C), 90/649 (D) and 91/361 (E) stimulated higher antibody titre and delayed type of hyper-sensitivity (DTH) response than the natural casein hexapeptide in BALB/c mice-sheep red blood cells (SRBC) and guinea pig-ovalbumin models. These peptides also induced higher stimulation of non-specific immune response as evidenced by increase in macrophage migration index (MMI), phagocytosis of (14C) lecuine labelled Escherchia coli, incorporation of (14C)-glucosamine in peritoneal macrophages and proliferative response of mouse thymocytes. Significant suppression on the course of Plasmodium berghei infection was also observed on day 4, in the animals treated with hexapeptidse C and D.
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