RCAI-133, an N-methylated analogue of KRN7000, activates mouse natural killer T cells to produce Th2-biased cytokines
作者:Takuya Tashiro、Tomokuni Shigeura、Masao Shiozaki、Hiroshi Watarai、Masaru Taniguchi、Kenji Mori
DOI:10.1039/c3md00073g
日期:——
We synthesized seven new analogues of KRN7000: RCAI-133 and 154–159. RCAI-154, 156 and 158 are secondary-amide analogues having a hydroxy, a methyl or two methyl groups at the α-position of a linear C18-acyl chain, respectively. RCAI-155, 157 and 159 are corresponding N-methylated tertiary amide analogues, and RCAI-133 is the N-methylated KRN7000. Among them, a PBS solution of RCAI-133 induced mouse lymphocytes to produce Th2-biasing cytokines in vivo, while RCAI-154–159 showed only weak or almost no immunostimulatory activity. Therefore, N-methylation led the glycolipid to produce predominantly Th2-type cytokines, while acyl α-substitution was detrimental to activity.
我们合成了七种新的KRN7000类似物:RCAI-133和154–159。RCAI-154、156和158是次级酰胺类似物,分别在直链C18酰基链的α位有一个羟基、一个甲基或两个甲基。RCAI-155、157和159是对应的N-甲基化的三级酰胺类似物,而RCAI-133是N-甲基化的KRN7000。其中,RCAI-133的PBS溶液在体内诱导小鼠淋巴细胞产生Th2偏向细胞因子,而RCAI-154至159显示出仅微弱或几乎无免疫刺激活性。因此,N-甲基化使糖脂主要产生Th2型细胞因子,而酰基α取代则对活性有害。