Synthesis and analgesic activity of cholecystokinin-heptapeptide analogs with N-terminal substitution.
作者:KOJI IUCHI、MASAHIRO NITTA、KEIZO ITO、YASUO MORIMOTO、GORO TSUKAMOTO
DOI:10.1248/cpb.36.959
日期:——
Analogs of Cholecystokinin-heptapeptide (CCK-7), i.e., two epimers of 3-(-sulfooxyphenyl)-2-methylpropanoyl-Met-Gly-Trp-Met-Asp-Phe-NH2, two epimers of 3-(4-sulfooxyphenyl)-2-methylpropanoyl-Nle-Gly-Trp-Met-Asp-Phe-NH2 and [D-Try(SO3H)1]-CCK-7, were prepared by the solution method. The analgesic effects of these analogs were measured by means of the writhing test. These analogs produced analgesic effects after subcutaneous injection in mice. The replacement of the tyrosine(O-sulfate) residue at position 1 by a 3(4-sulfooxyphenyl)-2-methyl-propanoyl group enhanced the analgesic effect, and the configuration of these residues hardly influenced the effect. On the other hand, the replacement of the L-methionine residue at position 2 by an L-norleucine residue in addition to the exchange of the tyrosine(O-sulfate) residue at position 1 for a 3-(4-sulfooxyphenyl)-2-methylpropanoyl group reduced the activity.
胆囊收缩素-七肽(CCK-7)的类似物,即3-(-磺氧苯基)-2-甲基丙酰基-Met-Gly-Trp-Met-Asp-Phe-NH2的两个异构体、3-(4-磺氧苯基)-2-甲基丙酰基-Nle-Gly-Trp-Met-Asp-Phe-NH2的两个异构体以及[D-Try(SO3H)1]-CCK-7,是通过溶液法制备的。这些类似物的镇痛效果通过扭动试验进行测量。它们在小鼠皮下注射后产生了镇痛效果。将位置1的酪氨酸(O-硫酸酯)残基替换为3-(4-磺氧苯基)-2-甲基丙酰基基团增强了镇痛效果,而这些残基的构型对效果几乎没有影响。另一方面,将位置2的L-蛋氨酸残基替换为L-诺 leucine 残基,并将位置1的酪氨酸(O-硫酸酯)残基替换为3-(4-磺氧苯基)-2-甲基丙酰基基团,减少了活性。