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Immunopharmacological activities of 2-keto-3-deoxyoctonic acid-(alpha 2----6)-linked 4-O-phosphono-D-glucosamine derivatives carrying N- and 3-O-acyl substituents

The immunopharmacological activities of 2-keto-3-deoxyoctonic acid (KDO)-(alpha 2----6)-linked lipid A-subunit analogs, 4-O-phosphono-D-glucosamine derivatives carrying N- and 3-O-acyl substituents, were compared with those of the corresponding analogs without KDO, GLA-27, GLA-47, and GLA-60. Among the analogs tested, GLA-60, a 4-O-phosphono-D-glucosamine carrying N-3-hydroxytetradecanoyl and 3-O-3-tetradecanoyloxytetradecanoyl groups, exhibited the most intensive activities in terms of mitogenicity, adjuvanticity, and mediator (tumor necrosis factor and colony-stimulating factor) induction. Binding (alpha 2----6) of KDO to GLA-60 failed to enhance the activities. Similarly, the activities of GLA-27 and GLA-47 were also decreased by introduction of KDO to the O-6 of the analogs. This indicates that the strengths of the activities of the subunit analogs depend on the kinds of N- and 3-O-linked acyl substituents and not on the presence of the KDO linked to the O-6.