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The Relationship between AMPK and HO-1 Expression Induced by Alpha-Lipoic Acid in Rat Aortic Smooth Muscle Cells

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The Relationship between AMPK and HO-1 Expression Induced by Alpha-Lipoic Acid in Rat Aortic Smooth Muscle Cells

Ssu-hui Wu

1

, Pao-Yun Cheng

2

, Mao-Hsiung Yen

1

1

Department of Pharmacology, National Defense Medical Center, Taipei, Taiwan.

2

School of Chinese Pharmaceutical Science and China Medical Resources, China Medical University, Taichung, Taiwan.

Heme oxygenase (HO) breakdown of heme and produce biliverdin and carbon monoxide (CO), followed by reduced sensitivity of tissues to oxidative stress.

In recently studies showed that induced heme oxygenase-1 (HO-1) expression as a therapeutic agent in multiple forms of cardiovascular diseases and

hypertension. Alpha-lipoic acid (ALA) is a natural antioxidant that scavenges reactive oxygen species (ROS) and regenerates or recycles endogenous antioxidants. In our lab recently researches found that ALA induced HO-1 expression and increase the AMP-activated protein kinase (AMPK) acitivity in rat aortic smooth muscle cells (A10 cells). But the relationship between AMPK and HO-1 was unknowed. The aim of this study was to inverstigate whether the role of AMPK in HO-1 induction and determined the relationship of basic leucine zipper transcription factor 1 (Bach-1) and Nuclear factor-erythroid 2- related factor 2 (Nrf2) expression in A10 cells by alpha-lipoic acid. The results showed that HO-1 expression occurred maximally at 30 μM and peaked at 6hrs in A10 cells. Meanwhile, phosphorylated-AMPK (p-AMPK) expression maximally at 30 μM, too. On the contrary, the expression of p-AMPK and HO-1 induced by ALA were all abolished in present of compound C (AMPK inhibitor).

Results indicated that AMPK may play an important role in the regulation of

HO-1 expression by ALA in A10 cells.

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