Serum immunoregulatory polypeptides and uses therefor

Chemistry: natural resins or derivatives; peptides or proteins; – Proteins – i.e. – more than 100 amino acid residues – Blood proteins or globulins – e.g. – proteoglycans – platelet...

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530300, 530350, 530395, 4241851, C07K 700, C07K 14745

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active

059731222

ABSTRACT:
Previously unisolated serum immunoregulatory polypeptides (SIPs) having a molecular weight of approximately 14,000 to 31,000 are provided. The SIPs may be obtained from hemorrhagic serum of mammals and have been shown to activate suppressor T-cells and suppress lymphocyte proliferation and interleukin production. There is a significant homology between SIPs of different mammalian species. The amino acid sequence of an SIP having a molecular weight of about 16,000 is provided. In addition, immunosuppressive polypeptides are identified which have the formula (SEQ ID NO:2):

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McLoughlin et al., "Correlation between anergy and a circulating immunosuppressive factor following major surgical trauma," Ann. Surg., vol. 190, No. 3, pp. 297-304, 1979.
Kohler et al., "Continuous cultures of fused cells secreting antibody of predefined specificity," Nature, vol. 256, pp. 495-497, 1975.
Abraham et al., "Effects of hemorrhagic serum on interleukin-2 generation and utilization," Critical Care Medicine, vol. 16, No. 4, pp. 307-311, 1988.
Abraham et al., "The role of interleukin 2 in hemorrhage-induced abnormalities of lymphocyte proliferation," Circulatory Shock, 18-205-213 (1986).
Abraham et al., "Generation of functionally active suppressor cells by hemorrhage and haemorrhagic serum," Clin. exp. Immunol. (1988) 72, 238-242 .

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