农业生物技术学报2012，Vol.20Issue(11)：1291-1299,9.
猪β-防御素体外抗菌活性和抗氧化活性研究
In vitro Detections of Antimicrobial and Antioxidant Activities of Porcine β-defensins
摘要
Abstract
Defensins are antimicrobial peptides which play important roles in the innate immune system of mammals. β-defensin-l(pBD-l) and β-defensin-2(pBD-2) are two defensins of great importance in swine. The information on defensin activity and function is very scarce. To study their antimicrobial and antioxidant activities, pBD-1 and pBD-2 were chemically synthesized, and their antimicrobial activities against eight gram-negative bacteria and three gram-positive bacteria were determined by minimal inhibitory concentration (MIC). The mechanisms of antimicrobial peptide activity were preliminary inquiried by transmission electron microscope, and the antioxidant activities in vitro were also studied. The results showed that pBD-1 had strong inhibition against Escherichia coli EPEC O78:K80 and Bacillus subtilis ATCC 6633, which MIC were both 32 μg/mL and minimal bactericide concentration(MBC) were 32 μg/mL and 128 μg/mL, respectively. But pBD-2 had strong inhibition just against Pseudomonas.aeruginosa CMCC 10104, which MIC was 8 μg/mL and MBC was 32 μg/mL. Transmission electron microscopy results showed that pBD-1 and pBD-2 might kill bacteria through the formation of transmembrane pore. pBD-1 and pBD-2 showed radicals scavenging activities and reducing power. Furthermore, the antioxidative activities of them were stronger when the concentrations were higher within certain concentration ranges. In conclusion, the research results indicated that pBD-1 and pBD-2 not only had antimicrobial activities but also had antioxidant activities in certain extent, and this may provide data base to clarify their biological functions and their development and application in animal husbandry.关键词
猪/防御素/抗菌活性/抗氧化Key words
Swine,β-defensins,Antimicrobial activity,Antioxidant activities引用本文复制引用
薛现凤,韩菲菲,高彦华,刘倚帆,夏溪,汪以真..猪β-防御素体外抗菌活性和抗氧化活性研究[J].农业生物技术学报,2012,20(11):1291-1299,9.基金项目
国家杰出青年基金(No.31025027)和中国博士后科学基金第五批特别资助项目(No.2012T50528) （No.31025027）
