| pubmed-article:2459075 | pubmed:abstractText | A lipid A-subunit analogue GLA-27, a 4-O-phosphono-D-glucosamine derivative carrying 3-O-tetradecanoyl and N-3-tetradecanoyloxytetradecanoyl groups, exhibited significant biological activities but no detectable pyrogenicity or local Shwarzman activity. In order to synthesize compounds combining GLA-27 with muramyl dipeptide (MDP), the OH group at the C6 position of GLA-27 was first succinylated. A compound which combined a succinylated GLA-27 (GLA-101) with 1-deoxy N-acetyl-muramyl-L-alanyl-D-isoglutamine methyl ester (1-deoxy MDP) via spacers of different carbon chain lengths of 5, 11 and 15, termed GLA-105, GLA-106 and GLA-107, respectively, and their biological activities were investigated. Intraperitoneal administration of combined preparations with spacers, GLA-105 and GLA-107, induced much higher phagocytic activity in peritoneal macrophages than GLA-27, GLA-101 and 1-deoxy MDP. The activity of GLA-106 did not increase by the combination. In induction of natural killer (NK) activity in peritoneal cells, GLA-105 and GLA-107 were significantly more active than 1-deoxy MDP but only comparable with GLA-27. GLA-101 showed stronger NK activity than GLA-27. The activity of GLA-106 was stronger than 1-deoxy MDP but weaker than GLA-27, GLA-105 and GLA-107. Mitogenic, interferon-inducing and tumor necrosis factor-inducing activities decreased by combining GLA-101 with 1-deoxy MDP. GLA-101, GLA-105 and GLA-107 strongly inhibited the formation of lesions on the tail of mice infected with Vaccinia virus. The activity was almost equivalent to that of GLA-27.(ABSTRACT TRUNCATED AT 250 WORDS) | lld:pubmed |
