Effect of A-769662, a direct AMPK activator, on Tlr-4 expression and activity in mice heart tissue

Rameshrad, Maryam and Maleki-Dizaji, Nasrin and Soraya, Hamid and Seyed Toutounchi, Negisa and Barzegari, Abolfazl and Garjani, Alireza (2016) Effect of A-769662, a direct AMPK activator, on Tlr-4 expression and activity in mice heart tissue. Iranian Journal of Basic Medical Sciences, 19 (12). pp. 1308-1317.

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Abstract

Objective(s): TLR-4 activates a number of inflammatory signaling pathways. Also, AMPK could be involved in anti-inflammatory signaling. The aim of this study was to identify whether stimulation of AMPK could inhibit LPS-induced Tlr-4 gene expression in mice hearts. Materials and methods: Heart AMPK activity and/or Tlr-4 expression was stimulated in different mice groups, using respectively IP injection of A-769662 (10 mg/kg) and LPS (2 mg/kg) or a combination of both agents. Moreover, compound-C (20 mg/kg), as an AMPK antagonist, was intraperitoneally co-administrated with both A-769662 and LPS in another group to investigate the role of AMPK activity on Tlr-4 regulation. After 8 hr, in addition to peripheral neutrophil cell count, myocardial p-AMPK, p-ACC as well as MyD88 protein contents and Tlr-4 expression was assessed by Western blotting and real-time qRT-PCR, respectively. TNF-α and IL-6 expression levels were also determined by ELISA. Results: LPS induced heart Tlr-4 expression (P<0.001) associating with an increase in the myocardial MyD88 protein content (P<0.001), elevation of heart TNF-α (P<0.01) and IL-6 (P<0.05) concentrations, and rise in the peripheral neutrophil cell count (P<0.001). Administration of A-769662 decreased LPS-induced Tlr-4 expression (P<0.01) and alleviated peripheral neutrophil cell count (P<0.01). The inhibitory effect of A-769662 on LPS-induced Tlr-4 expression was reversed by antagonizing AMPK with compound-C (P<0.001) which reduced p-AMPK (P<0.05) and p-ACC (P<0.01) myocardial protein contents in the LPS+A-769662 group. Conclusion: This study demonstrated that activation of AMPK, by A-769662 agent, could inhibit Tlr-4 expression and activity, suggesting a link between AMPK and Tlr-4 in heart tissue.

Item Type: Article
Subjects: QV pharmacology
Divisions: Journals > Iranian J Basic Medical Sciences
Depositing User: ijbms ijbms
Date Deposited: 26 Sep 2017 17:20
Last Modified: 26 Sep 2017 17:20
URI: http://eprints.mums.ac.ir/id/eprint/4812

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