Search

We have previously reported that seventy percent ethanol extract of Chrysanthemum indicum Linne (CIE) strongly reduces Epstein-Barr virus (EBV)-transformed lymphoblastoid cell line (LCL) survival by inhibiting virus-encoded latent infection membrane protein 1 (LMP1)-induced NF-κB activation. To identify an active compound(s) in CIE that inhibits LMP1-induced NF-κB activation, activity-guided fractionation was employed. The CH2Cl2 fraction of CIE strongly reduced LMP1-induced NF-κB activation and LCL viability with relatively low cytotoxic effects on primary human foreskin fibroblast (HFF), HeLa or Burkitt’s lymphoma (BL41) cells. Furthermore, lupeol, a pentacyclic triterpene, was identified in the CH2Cl2 fraction of CIE to attenuate LMP1-induced NF-κB activation and LCL viability. This study demonstrates that lupeol is one of active compounds in the CH2Cl2 fraction of CIE that inhibits LMP1-induced NF-κB activation and reduces NF-κB-dependent LCL viability. [ABSTRACT FROM AUTHOR]

Abstract: Epstein-Barr virus (EBV) latent infection transforms B lymphocytes into proliferating lymphoblastoid cell lines (LCLs). EBV latent infection membrane protein 1 (LMP1) is required for EBV-mediated B lymphocyte transformation, and LMP1-induced NF-κB activation is essential for LCL survival. To identify a novel inhibitor candidate for LMP1-induced NF-κB activation, crude ethanol extracts of medicinal plants were screened for the potential NF-κB inhibitory activity. Seventy percent ethanol extract of Chrysanthemum indicum Linne extract (CIE) strongly reduced LMP1-induced NF-κB activation. In addition, CIE inhibited LMP1-induced IKKα or IKKβ activation. Interestingly, CIE treatment rapidly reduced LCL viability without exhibiting any adverse effects on the viability of human foreskin fibroblasts (HFF), EBV negative Burkitt’s lymphoma cell lines (BL41) or HeLa cells. Taken together, CIE has potent inhibitory effect on EBV LMP1-induced NF-κB activation and EBV-transformed LCL viability. [Copyright &y& Elsevier]