An inhibitor of c-Jun N-terminal kinases (CEP-11004) counteracts the anti-HIV-1 action of trichosanthin.

Abstract:

:Trichosanthin (TCS) is a type I ribosome-inactivating protein possessing multiple biological and pharmacological activities. One of its major actions is inhibition of human immunodeficiency virus (HIV) replication. The mechanism is still not clear. It is generally believed that this action is mediated via ribosome inactivation. Recently, we found that some TCS mutants with full ribosome inactivating activity were devoid of anti-HIV-1 effect. This suggested that there might be other mechanisms contributing to the anti-HIV-1 action. This study showed that a commonly used c-Jun N-terminal kinases inhibitor (CEP-11004) could counteract the antiviral action of TCS in C8166 cells. CEP-11004 alone had no effect on HIV-1 replication and TCS alone significantly inhibited this process. When CEP-11004 was used together with TCS, the antiviral action of TCS was much reduced. Two methods were used to assess viral replication. (1) By measuring the HIV-1 reverse transcriptase, TCS on the average reduced viral replication to 52+/-4%. With CEP-11004 pretreatment, TCS appeared to lose the HIV-1 inhibitory activity with viral replication stood at 101+/-7%. (2) By measuring HIV-1 p24, TCS reduced viral replication to 68+/-4%. With CEP-11004 pretreatment, TCS again seemed to lose its anti-HIV-1 activity with HIV-1 replication rose back to 101+/-4%. Both indexes indicated that CEP-11004 counteracted the antiviral action of TCS. Phosphorylation of JNK on the other hand was only slightly elevated by 1.5-fold by TCS and CEP-11004 inhibited this elevation. These results suggested that the anti-HIV-1 effect of TCS may be related to the MAPK signal process downstream from the point of CEP inhibition.

authors

Ouyang DY,Chan H,Wang YY,Huang H,Tam SC,Zheng YT

doi

10.1016/j.bbrc.2005.11.004

subject

Has Abstract

pub_date

2006-01-06 00:00:00

pages

25-9

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(05)02497-6

journal_volume

339

pub_type

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