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• W2004603742 abstract "Phytohemagglutinin was prominent in the evaluation of the immunosuppressive effects of mitogenic lectins that started in 1965 and continued for two decades. Basic studies elucidated the inhibitory actions of PHA on humoral and cellular immune responses in mice, rats, and guinea pigs. Some suppressive effects of this and other mitogens including lentil lectin and Con A were demonstrated on renal, skin, pancreas, and heart allograft rejections in mice, rats, and dogs. In addition to their inherent suppressive activities, these substances have been shown to potently augment the suppression generated by conventional agents. More relevant to tolerance-inducing modulations, the Rigas group showed that in vitro incubation of the parental spleen cells with PHA in the F1 hybrid model before giving them to the F1 mouse virtually abolished the GvH responses. Their explanation was that the donor cells were rendered unresponsive by their reversion to an immature state in which they lost the essential surface receptors. Similar spleen cell suppression was generated by systemic administration of PHA to the parental donor prior to their administration. A method is proposed here for establishing tolerance to either newly introduced or firmly established antigens applying the L4 isolectin of PHA to make non-reactive all T lymphocytes that remain functional in conjunction with full suppression by conventional agents. During the vulnerable period of drug-induced suppression, the host would be protected from infection and bleeding by full nonspecific proliferative activation of the lymphoid and myeloid systems. The establishment of allograft tolerance by preemptive inhibition of responses to newly introduced transplant antigens would be easier to achieve than the reversal of firmly established responses to antigens involved in GvH reactions and autoimmune diseases. The studies of von Boehmer and Kisielow in a transgenic mouse model confirmed that clonal deletion does occur in the thymus whereby corresponding specific thymocytes are destroyed when they encounter self-antigens. Their work suggested that tolerance to self-antigens might be established if immune responses against putative antigen peptides were blocked sufficiently that they would be released to reach the central or peripheral residence sites of their immunologically reactive clones for deletion to occur. This approach to suppressive therapy would be useful for managing the problems of allograft rejection, GvH reactions, and autoimmune disorders even if they fell short of generating complete tolerance. Suppressive treatment with mitogens would also be indicated for the immune-related group of aplastic anemias, but a discussion of these disorders will be deferred to a separate article because of certain aberrations they present." @default.
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• W2004603742 date "1998-04-01" @default.
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• W2004603742 title "Immunosuppressive Applications of PHA and Other Plant Mitogens" @default.
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• W2004603742 doi "https://doi.org/10.1089/cbr.1998.13.99" @default.
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