摘要
A large number of protease inhibitors have been found from leeches,which are essential in various physiological and biological processes.In the curret study,a novel elastase inhibitor was purified and characterized from the leech of Hirudinaria manillensis,which was named HMEI-A.Primary structure analysis showed that HMEI-A belonged to a new family of proteins.HMEI-A exerted inhibitory effects on elastase and showed potent abilities to inhibit elastase with an inhibition constant(Ki)of 1.69×10^(−8) mol·L^(−1).Further study showed that HMEI-A inhibited the formation of neutrophil extracellular trap(NET).These results suggested that HMEIA from the leech of H.manillensis is a novel elastase inhibitor which can suppress NET formation.It may play a significant role in blood-sucking of leeches and is a potential candidate as an anti-inflammatory agent.
基金
supported from the National Science Foundation of China(Nos.31630075,21761142002,and 31801975)
the Strategic Leading Project and Biological Resource Platform Project from Chinese Academy of Sciences(Nos.KFZDSW-219-2,ZSTH-034 and SAJC201606)
the Natural Science Foundation of Yunnan Province(Nos.2019-YT-053 and 202001AT070116)
the Social Development Foundation of Yunnan Province(Nos.2019ZF003 and 2018ZF001)
Key Research and Development Plan from the Ministry of Science and Technology of China(No.2018YFA0801403).
