Abstract Title:

Resveratrol inhibited Tat-induced HIV-1 LTR transactivation via NAD(+)-dependent SIRT1 activity.

Abstract Source:

Free Radic Biol Med. 2008 Oct 1;45(7):1019-26. Epub 2008 Jul 16. PMID: 19664641

Abstract Author(s):

Hong-Sheng Zhang, Yue Zhou, Meng-Ran Wu, Hong-Sen Zhou, Fei Xu

Article Affiliation:

Department of Virology and Pharmacology, College of Life Science and Bioengineering, Beijing University of Technology, District of Chaoyang, Beijing 100124, China. zhanghs@bjut.edu.cn

Abstract:

AIMS: Tat protein plays a pivotal role in both the human immunodeficiency virus type 1 (HIV-1) replication cycle and the pathogenesis of HIV-1 infection. Sirtuins 1 (SIRT1) is a possible candidate for redox modulation because its activity is regulated by nicotinamide adenine dinucleotide (NAD(+)) or NAD(+)/NADH ratio. The aim of the present study was to determine whether the redox status and SIRT1 expression are related to HIV-1 Tat protein-induced transactivation. MAIN METHODS: HeLa-CD4-long terminal repeat (LTR)-beta-gal (MAGI) cells were transfected with Tat plasmid. Tat-induced HIV-1 LTR transactivation was determined by MAGI cell assay. The NAD(+) or NADH levels and SIRT1 activity were measured. In addition, the protein expression of SIRT1 was assayed by western blotting. KEY FINDINGS: Pretreatment with resveratrol increased intracellular NAD(+) levels and SIRT1 protein expression after Tat plasmid transfection in a concentration-dependent manner. Pretreatment with resveratrol attenuated Tat-induced HIV-1 transactivation in MAGI cells. These effects of resveratrol were largely abolished by knockdown of SIRT1 by short interfering RNA (siRNA). Pretreatment with nicotinamide, a SIRT1 inhibitor, potentiated Tat-induced HIV-1 transactivation in MAGI cells, and overexpression of SIRT1 attenuated Tat-induced HIV-1 transcription in MAGI cells. SIGNIFICANCE: Inhibition of SIRT1 activity by Tat is considered a critical step of Tat transactivation. Resveratrol and related compounds represent potential candidates for novel anti-HIV therapeutics.

Study Type : In Vitro Study
Additional Links
Pharmacological Actions : Anti-HIV Agents : CK(111) : AC(63)
Additional Keywords : Stilbenes : CK(402) : AC(242)

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