Article

AMP-Activated Protein Kinase–Deficient Mice Are Resistant to the Metabolic Effects of Resveratrol

Laboratory of Biochemical Genetics, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland, USA.
Diabetes (Impact Factor: 8.1). 11/2009; 59(3):554-63. DOI: 10.2337/db09-0482
Source: PubMed

ABSTRACT

Resveratrol, a natural polyphenolic compound that is found in grapes and red wine, increases metabolic rate, insulin sensitivity, mitochondrial biogenesis, and physical endurance and reduces fat accumulation in mice. Although it is thought that resveratrol targets Sirt1, this is controversial because resveratrol also activates 5' AMP-activated protein kinase (AMPK), which also regulates insulin sensitivity and mitochondrial biogenesis. Here, we use mice deficient in AMPKalpha1 or -alpha2 to determine whether the metabolic effects of resveratrol are mediated by AMPK.
Mice deficient in the catalytic subunit of AMPK (alpha1 or alpha2) and wild-type mice were fed a high-fat diet or high-fat diet supplemented with resveratrol for 13 weeks. Body weight was recorded biweekly and metabolic parameters were measured. We also used mouse embryonic fibroblasts deficient in AMPK to study the role of AMPK in resveratrol-mediated effects in vitro.
Resveratrol increased the metabolic rate and reduced fat mass in wild-type mice but not in AMPKalpha1(-/-) mice. In the absence of either AMPKalpha1 or -alpha2, resveratrol failed to increase insulin sensitivity, glucose tolerance, mitochondrial biogenesis, and physical endurance. Consistent with this, the expression of genes important for mitochondrial biogenesis was not induced by resveratrol in AMPK-deficient mice. In addition, resveratrol increased the NAD-to-NADH ratio in an AMPK-dependent manner, which may explain how resveratrol may activate Sirt1 indirectly.
We conclude that AMPK, which was thought to be an off-target hit of resveratrol, is the central target for the metabolic effects of resveratrol.

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    • "However, AMPK-Nrf2 relation still remains to be fully elucidated. Accordingly, Um et al. [196] have demonstrated that resveratrol (400 mg/kg.day −1 supplemented in a HFD for 13 weeks) did not induce mitochondrial biogenesis in mice lacking AMPKα1 or α2 (AMPKα1 − / − or AMPKα2 − / − , respectively). "
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    ABSTRACT: Background: Mitochondria, the power plants of the cell, are known as a cross-road of different cellular signalling pathways. These cytoplasmic double-membraned organelles play a pivotal role in energy metabolism and regulate calcium flux in the cells. It is well known that mitochondrial dysfunction is associated with different diseases such as neurodegeneration and cancer. A growing body of literature has shown that polyphenolic compounds exert direct effects on mitochondrial ultra-structure and function. Resveratrol is known as one of the most common bioactive constituents of red wine, which improves mitochondrial functions under in vitro and in vivo conditions. Scope of review: This paper aims to review the molecular pathways underlying the beneficial effects of resveratrol on mitochondrial structure and functions. In addition, we discuss the chemistry and main sources of resveratrol. Major conclusions: Resveratrol represents the promising effects on mitochondria in different experimental models. However, there are several reports on the detrimental effects elicited by resveratrol on mitochondria. General significance: an understanding of the chemistry and source of resveratrol, its bioavailability and the promising effects on mitochondria brings a new hope to therapy of mitochondrial dysfunction-related diseases.
    No preview · Article · Jan 2016 · Biochimica et Biophysica Acta (BBA) - General Subjects
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    • "Moreover, RESV, per se, is a powerful oxidant that in a moderate to high μM range (N 50 μM) was shown to activate AMPK in a SIRT1-independent manner, improving mitochondrial function and, consequently, neuronal survival [6] (Fig. 1). Likewise, RESV failed to improve metabolic parameters and mitochondrial biogenesis in AMPKα1 subunit KO mice [78], revealing an important role of this kinase regulated under conditions favoring ATP metabolism. Concordantly, high doses of RESV improved neuronal survival in Sir2 homozygous null flies expressing mHtt exon 1 with 93Q (Httex1pQ93) [58]. "
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    ABSTRACT: Sirtuins are a conserved family of NAD(+)-dependent class III lysine deacetylases, known to regulate longevity. In mammals, the sirtuin family has seven members (SIRT1-7), which vary in enzymatic activity, subcellular distribution and targets. Pharmacological and genetic modulation of SIRTs has been widely spread as a promising approach to slow aging and neurodegenerative processes. Huntington's disease (HD) is a neurodegenerative disorder linked to expression of polyglutamine-expanded huntingtin (HTT) protein for which there is still no disease-reversing treatment. Studies in different animal models provide convincing evidence that SIRT1 protects both cellular and animal models from mutant HTT toxicity, however controversial results were recently reported. Indeed, as a consequence of a variety of SIRT-activation pathways, either activation or inhibition of a specific SIRT appears to be neuroprotective. Therefore, this review summarizes the recent progress and knowledge in sirtuins (particularly SIRT1-3) and their implications for HD treatment. Copyright © 2015. Published by Elsevier B.V.
    Full-text · Article · Jul 2015 · Biochimica et Biophysica Acta
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    • "Indeed, Roberts reported that fetal pancreatic development was altered in resveratrol-supplemented pregnancies which may have negative effects on metabolism later in life [27]. The metabolic effects of resveratrol have been shown to depend upon activation of AMPK [28]. Indeed, we demonstrated in our model that chronic resveratrol supplementation of HFD prior to and during pregnancy was associated with 22-fold higher levels of phosphorylated AMPK in the placenta as compared to HFD alone. "
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    ABSTRACT: INTRODUCTION: Adequate maternal supply and placental delivery of long chain polyunsaturated fatty acids (LCPUFA) is essential for normal fetal development. In humans, maternal obesity alters placental FA uptake, though the impact of diet remains uncertain. The fatty fetal liver observed in offspring of Japanese macaques fed a high fat diet (HFD) was prevented with resveratrol supplementation during pregnancy. We sought to determine the effect of HFD and resveratrol, a supplement with insulin-sensitizing properties, on placental LCPUFA uptake in this model. METHODS: J. macaques were fed control chow (15% fat, n = 5), HFD (35% fat, n = 10) or HFD containing 0.37% resveratrol (n = 5) prior to- and throughout pregnancy. At ∼130d gestation (term = 173d), placentas were collected by caesarean section. Fatty acid uptake studies using (14)C-labeled oleic acid, arachidonic acid (AA) and docosahexanoic acid (DHA) were performed in placental explants. RESULTS: Resveratrol supplementation increased placental uptake of DHA (P < 0.05), while HFD alone had no measurable effect. Resveratrol increased AMP-activated protein kinase activity and mRNA expression of the fatty acid transporters FATP-4, CD36 and FABPpm (P < 0.05). Placental DHA content was decreased in HFD dams; resveratrol had no effect on tissue fatty acid profiles. DISCUSSION: Maternal HFD did not significantly affect placental LCPUFA uptake. Furthermore, resveratrol stimulated placental DHA uptake capacity, AMPK activation and transporter expression. Placental handling of DHA is particularly sensitive to the dramatic alterations in the maternal metabolic phenotype and placental AMPK activity associated with resveratrol supplementation.
    Full-text · Article · Jun 2015 · Placenta
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