Investigations of the In-vitro Metabolism of Three Opioid Tetrapeptides by Pancreatic and Intestinal Enzymes
作者:Eva Krondahl、Hans Von Euler-Chelpin、Achim Orzechowski、Gunilla Ekström、Hans Lennernäs
DOI:10.1211/0022357001774642
日期:2010.2.18
, Tyr-D-Arg-Phe-Phe-NH2 and Tyr-D-Ala-Phe-Phe-NH2, was investigated in the presence of pure pancreatic enzymes (trypsin, chymotrypsin, elastase, carboxypeptidase A and carboxypeptidase B), as well as in the presence of pure carboxylesterase and aminopeptidase N. The cleavage patterns of the pure pancreatic enzymes were then compared with those found in rat and human jejunal fluid. Metabolism was also
在纯存在下研究了三种阿片类四肽Tyr-D-Arg-Phe-Nva-NH2,Tyr-D-Arg-Phe-Phe-NH2和Tyr-D-Ala-Phe-Phe-NH2的代谢胰酶(胰蛋白酶,胰凝乳蛋白酶,弹性蛋白酶,羧肽酶A和羧肽酶B),以及在纯羧酸酯酶和氨肽酶N的存在下。然后将纯胰酶的裂解模式与大鼠和人空肠液中的裂解模式进行比较。还研究了来自不同肠道区域(十二指肠,空肠,回肠和结肠)的匀浆以及大鼠肠细胞胞浆中的代谢。在空肠匀浆中研究了各种蛋白酶抑制剂的作用。通过高效液相色谱法测定亲本肽,并通过液相色谱-质谱法鉴定代谢产物。在纯酶中,胰酶胰凝乳蛋白酶,胰蛋白酶和羧肽酶A观察到肽水解最快。在大多数情况下,它们形成了相应的脱酰胺四肽(胰凝乳蛋白酶和胰蛋白酶)或三肽,缺少C末端氨基酸(羧肽酶)。一种)。发现所有三种肽的肠道代谢率均存在区域差异(P <0.001),在空肠和/或结肠匀浆中观察到的率最高。脱