ent-Epiafzelechin-(4alpha-->8)-epiafzelechin extracted from Cassia javanica inhibits herpes simplex virus type 2 replication.
Herpes simplex virus (HSV) is a ubiquitous organism that causes infections in human populations throughout the world. It causes a variety of diseases ranging in severity from mild to life-threatening. In this study, ent-epiafzelechin-(4alpha-->8)-epiafzelechin (EEE) extracted from the fresh leaves of Cassia javanica L. agnes de Wit (Leguminosae) was investigated for its in vitro anti-HSV-2 activity using XTT and plaque reduction assays. Results showed that EEE inhibited HSV-2 replication in a dose-dependent manner. The IC50 value was 83.8 +/- 10.9 and 166.8 +/- 12.9 microM for XTT and plaque reduction assays, respectively. EEE did not affect the viability and the proliferation of cells at antiviral concentrations. Mechanistic studies demonstrated that EEE prevented HSV-2 from penetrating the cell and also interfered with HSV-2 replication at the late stage of its life cycle. It also disturbed virus attachment but the inhibitory effect was minor. In summary, the conclusion of this study was that EEE exhibits various modes of action in suppressing HSV-2 multiplication.
Cheng
Hua-Yew
HY
Department of Cosmetic Applications & Management, Tung Fang Institute of Technology, 829 Kaohsiung County, Taiwan.
Yang
Chien-Min
CM
Graduate Institute of Pharmaceutical Sciences, College of Pharmacy, Kaohsiung Medical University, 807 Kaohsiung, Taiwan.
Lin
Ta-Chen
TC
General Education Center, Chungtai Institute of Health Sciences and Technology, Taichung, Taiwan.
Shieh
Den-En
DE
Department of Food Science and Technology, Tajen Institute of Technology, 907 Ping-Tung, Taiwan.
Lin
Chun-Ching
CC
Graduate Institute of Pharmaceutical Sciences, College of Pharmacy, Kaohsiung Medical University, 807 Kaohsiung, Taiwan.
D000818:Animals; D000998:Antiviral Agents / Q000737:chemistry / Q000494:pharmacology*; D002366:Cassia / Q000737:chemistry*; D002392:Catechin / Q000031:analogs & derivatives* / Q000737:chemistry / Q000494:pharmacology; D002522:Chlorocebus aethiops; D004305:Dose-Response Relationship, Drug; D004365:Drugs, Chinese Herbal / Q000737:chemistry; D018258:Herpesvirus 2, Human / Q000187:drug effects* / Q000502:physiology; D018515:Plant Leaves / Q000737:chemistry; D014709:Vero Cells; D014779:Virus Replication / Q000187:drug effects
D000998:Antiviral Agents; D004365:Drugs, Chinese Herbal; C508495:ent-epiafzelechin-(4alpha-8)epiafzelechin; D002392:Catechin