title: Protective effect of polygoni cuspidati radix and emodin on Vibrio vulnificus cytotoxicity and infection.
abstract: Vibrio vulnificus, a good model organism of bacterial septicemia, causes fatal septicemia manifesting a fulminating course and a high mortality rate within days. In order to identify new natural substances preventing V. vulnificus infection, a plant library was screened for inhibiting cytotoxicity to host cells by using Trypan blue staining and LDH assay. We found that Polygoni Cuspidati Radix potently suppressed the acute death of HeLa and RAW264.7 cells in a dose dependent manner. Further studies revealed that Polygoni Cuspidati Radix inhibited V. vulnificus growth and survival in HI broth and seawater, respectively. We confirmed that Polygoni Cuspidati Radix contained high level of emodin by thin layer chromatography (TLC). Emodin showed direct antibacterial activity against V. vulnificus. In addition, emodin prevented the morphologic damages and acute death of HeLa cells caused from V. vulnificus. The safety of Polygoni Cuspidati Radix and emodin to host cells was confirmed by MTT assay. Polygoni Cuspidati Radix and emodin protected mice from V. vulnificus infection.
authors.affiliation: Department of Oriental Medicine Materials, Dongshin University, Jeonnam, 520-714, Republic of Korea.
authors.forename: Jong Ro
authors.initials: JR
authors.lastname: Kim
authors.forename: Dool-Ri
authors.initials: DR
authors.lastname: Oh
authors.forename: Mi Hye
authors.initials: MH
authors.lastname: Cha
authors.forename: Byoung Sik
authors.initials: BS
authors.lastname: Pyo
authors.forename: Joon Haeng
authors.initials: JH
authors.lastname: Rhee
authors.forename: Hyon E
authors.initials: HE
authors.lastname: Choy
authors.forename: Won Keun
authors.initials: WK
authors.lastname: Oh
authors.forename: Young Ran
authors.initials: YR
authors.lastname: Kim
mesh_terms: D000818:Animals; D001431:Bacteriological Techniques; D001681:Biological Assay; D002460:Cell Line; D002470:Cell Survival; D003470:Culture Media; D004642:Emodin / Q000494:pharmacology* / Q000627:therapeutic use; D045468:Fallopia japonica / Q000737:chemistry*; D006367:HeLa Cells; D006801:Humans; D051379:Mice; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D012623:Seawater / Q000382:microbiology; D014735:Vibrio Infections / Q000188:drug therapy* / Q000382:microbiology / Q000401:mortality; D041261:Vibrio vulnificus / Q000187:drug effects* / Q000254:growth & development / Q000472:pathogenicity
chemical_list: D003470:Culture Media; D010936:Plant Extracts; D004642:Emodin