Induction of suppressor T cells by neuraminic acid derivatives.
作者:ISAO KIJIMA、KUNIO EZAWA、SATOSHI TOYOSHIMA、KIMIO FURUHATA、HARUO OGURA、TOSHIAKI OSAWA
DOI:10.1248/cpb.30.3278
日期:——
We investigated the effects of α- and β-methylglycosides of N-acetylneuraminic acid and its disaccharide derivatives on the proliferation and immunological functions of murine lymphocytes. The Con A-induced increase of deoxyribonucleic acid (DNA) synthesis was enhanced by some of these neuraminic acid derivatives when they were added to a culture of murine spleen lymphocytes, and the disaccharide nucleosides, 5-fluoro-2', 3'-isopropylidene-5'-O-(4-N-acetyl-2, 4-dideoxy-3, 6, 7, 8-tetra-O-acetyl-1-methoxycarbonyl-D-glycero-α-D-galactooctapyranosyl) uridine (compound 9) and 2', 3'-di-O-acetyl-4-N-acetyl-2, 4-dideoxy-3, 6, 7, 8-tetra-O-acetyl-1-methoxycarbonyl-D-glycero-α-D-galactooctapyranosyl) inosine (compound 10), were especially effective. The above disaccharide nucleosides and their starting materials, 5-fluoro-2', 3'-isopropylidene uridine (FIU) and 2', 3'-di-O-acetylinosine (DAI), suppressed in vitro primary antibody response toward sheep red blood cells (SRBC). In vivo antibody response toward SRBC was also suppressed when compound 9 or 10 was injected intraperitoneally into mice with SRBC. Moreover, lymphocytes incubated with compound 9 or 10 showed suppressor activity on primary anti-SRBC antibody response in vitro. On the other hand, FIU and DAI did not induce the suppressor activity of murine lymphocytes in vivo or in vitro. The induction of suppressor cells by compounds 9 and 10 was abolished by pretreatment of the lymphocytes with anti Thy-1 antiserum plus complement. These results suggest that these disaccharide nucleosides can induce suppressor T cells.
我们研究了 N-乙酰神经氨酸的 α-和 β-甲基糖苷及其二糖衍生物对小鼠淋巴细胞增殖和免疫功能的影响。在小鼠脾脏淋巴细胞培养液中加入其中一些神经氨酸衍生物后,Con A 诱导的脱氧核糖核酸(DNA)合成增加得到了增强,而双糖核苷、5-氟-2',3'-异亚丙基-5'-O-(4-N-乙酰基-2,4-二脱氧-3、6,7,8-四-O-乙酰基-1-甲氧基羰基-D-甘油-α-D-半乳吡喃糖基)尿苷(化合物 9)和 2',3'-二-O-乙酰基-4-N-乙酰基-2,4-二脱氧-3,6,7,8-四-O-乙酰基-1-甲氧基羰基-D-甘油-α-D-半乳吡喃糖基)肌苷(化合物 10)特别有效。上述双糖核苷及其起始原料--5-氟-2', 3'-异亚丙基尿苷(FIU)和 2',3'-二-O-乙酰基肌苷(DAI)--抑制了体外对绵羊红细胞(SRBC)的初级抗体反应。将化合物 9 或 10 腹腔注射到带有 SRBC 的小鼠体内,也会抑制体内对 SRBC 的抗体反应。此外,用化合物 9 或 10 培养的淋巴细胞在体外对初级抗 SRBC 抗体反应表现出抑制活性。另一方面,FIU 和 DAI 在体内和体外均不能诱导小鼠淋巴细胞的抑制活性。用抗 Thy-1 抗血清加补体预处理淋巴细胞后,化合物 9 和 10 对抑制细胞的诱导作用就会消失。这些结果表明,这些双糖核苷可以诱导抑制性 T 细胞。