title: [Study on membrane injury mechanism of total alkaloids and berberine from Coptidis Rhizoma on Aeromonas hydrophila].
abstract: To explore the antibacterial activity and mechanism of total alkaloids and berberine from Coptidis Rhizoma on Aeromonas hydrophila, and determine the effect of total alkaloids and berberine from Coptidis Rhizoma on minimum inhibitory concentrations, permeability and fluidity of cell membrane, conformation of membrane proteins and virulence factors of A. hydrophila. The results showed that both total alkaloids and berberine from Coptidis Rhizoma had antibacterial activities on A. hydrophila, with minimum inhibitory concentrations of 62.5 and 125 mg · L(-1), respectively. Total alkaloids and berberine from Coptidis Rhizoma could increase the fluidity of membrane, change the conformation of membrane porteins and increase the permeability of bacteria membrane by 24.52% and 19.66%, respectively. Besides, total alkaloids and berberine from Coptidis Rhizoma significantly decreased the hemolysis of exotoxin and the mRNA expressions of aerA and hlyA (P < 0.05, P < 0.01), the secretion of endotoxin and the mRNA expression of LpxC (P < 0.05, P < 0.01). The results suggested that the antibacterial activity of total alkaloids and berberine from Coptidis Rhizoma on A. hydrophila may be related to the bacteria membrane injury. They inhibited the bacterial growth by increasing membrane lipid fluidity and changing conformation of membrane proteins, and reduced the secretion of virulence factors of A. hydrophila to weaken the pathogenicity.
authors: Dong-fang
authors: DF
authors: Xue
authors: Zong-yao
authors: ZY
authors: Zou
authors: Biao
authors: B
authors: Chen
authors: Yan-zhi
authors: YZ
authors: Wang
authors: Hao
authors: H
authors: Wu
authors: Xiao-li
authors: XL
authors: Ye
authors: Xue-gang
authors: XG
authors: Li
mesh_terms: D016980:Aeromonas hydrophila / Q000187:drug effects* / Q000235:genetics / Q000378:metabolism; D000470:Alkaloids / Q000494:pharmacology*; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism; D001427:Bacterial Toxins / Q000096:biosynthesis; D001599:Berberine / Q000494:pharmacology*; D002462:Cell Membrane / Q000187:drug effects* / Q000235:genetics / Q000378:metabolism; D039323:Coptis / Q000737:chemistry*; D004365:Drugs, Chinese Herbal / Q000494:pharmacology*; D008560:Membrane Fluidity / Q000187:drug effects; D027343:Rhizome / Q000737:chemistry
chemical_list: D000470:Alkaloids; D000900:Anti-Bacterial Agents; D001426:Bacterial Proteins; D001427:Bacterial Toxins; D004365:Drugs, Chinese Herbal; D001599:Berberine