Evaluation of anti-HCV activity and SAR study of (+)-lycoricidine through targeting of host heat-stress cognate 70 (Hsc70)
摘要:
The anti hepatitis C virus (HCV) activity of (+)-lycoricidine (1) was evaluated for the first time in this letter, yielding an EC50 value of 0.55 nmol/mL and an selection index (SI) value of 12.72. Further studies indicated that 1 induced this effect by down-regulating host heat-stress cognate 70 (Hsc70) expression. In addition, 20 derivatives were designed and synthesised to investigate the basic structure-activity relationship (SAR) of the title compound. Several of these derivatives exhibit a good inhibition of HCV, such as compound 3 (EC50 = 0.68 nmol/mL, SI = 33.86), compound 2d (EC50 = 15 nmol/mL, SI = 12) and compound 5 (EC50 = 33 nmol/mL, SI > 10.91). Meanwhile, the experimental data suggest that the modification of certain groups of (+)-lycoricidine can reduce the cytotoxicity of the compounds. (C) 2013 Elsevier Ltd. All rights reserved.
Isolation and Structural Modification of 7-Deoxynarciclasine and 7-Deoxy-<i>trans</i>-Dihydronarciclasine<sup>,1</sup>
作者:George R. Pettit、Stephen A. Eastham、Noeleen Melody、Brian Orr、Delbert L. Herald、Jane McGregor、John C. Knight、Dennis L. Doubek、George R. Pettit、Lynnette C. Garner、Joy A. Bell
DOI:10.1021/np058068l
日期:2006.1.1
relationship studies of pancratistatin (1), various techniques were first evaluated for separating the mixtures of 7-deoxynarciclasine (2b) and 7-deoxy-trans-dihydronarciclasine (3a) isolated from Hymenocallis littoralis. An efficient solution for that otherwise difficult separation then allowed the lactam carbonyl group of protected (4c and 5c) alcohols 2b and 3a to be reduced employing lithiumaluminum hydride
The anti hepatitis C virus (HCV) activity of (+)-lycoricidine (1) was evaluated for the first time in this letter, yielding an EC50 value of 0.55 nmol/mL and an selection index (SI) value of 12.72. Further studies indicated that 1 induced this effect by down-regulating host heat-stress cognate 70 (Hsc70) expression. In addition, 20 derivatives were designed and synthesised to investigate the basic structure-activity relationship (SAR) of the title compound. Several of these derivatives exhibit a good inhibition of HCV, such as compound 3 (EC50 = 0.68 nmol/mL, SI = 33.86), compound 2d (EC50 = 15 nmol/mL, SI = 12) and compound 5 (EC50 = 33 nmol/mL, SI > 10.91). Meanwhile, the experimental data suggest that the modification of certain groups of (+)-lycoricidine can reduce the cytotoxicity of the compounds. (C) 2013 Elsevier Ltd. All rights reserved.