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Biochim Biophys Acta Mol Cell Res. 2017 Dec;1864(12):2369-2377. doi: 10.1016/j.bbamcr.2017.08.009. Epub 2017 Aug 25.

AMPK downregulates ALK2 via increasing the interaction between Smurf1 and Smad6, leading to inhibition of osteogenic differentiation.

Author information

1
Jiangxi Province Key Laboratory of Tumor Pathogenesis and Molecular Pathology, Department of Pathophysiology, Schools of Basic Sciences and Pharmaceutical Sciences, Nanchang University Medical College, Nanchang, China; Department of Biochemistry, Boston University School of Medicine, Boston, MA 02118, United States.
2
Department of Biochemistry, Boston University School of Medicine, Boston, MA 02118, United States.
3
Department of Cardiology, Boston Children's Hospital, 300 Longwood Avenue, Boston, MA 02115, United States.
4
The Institute of Digestive Diseases, The First Affiliated Hospital, Nanchang University, Nanchang, China.
5
School of Life Sciences, Tsinghua University, Beijing, China.
6
Department of Orthopaedic Surgery, Boston University School of Medicine, Boston, MA, United States.
7
Jiangxi Province Key Laboratory of Tumor Pathogenesis and Molecular Pathology, Department of Pathophysiology, Schools of Basic Sciences and Pharmaceutical Sciences, Nanchang University Medical College, Nanchang, China; Department of Biochemistry, Boston University School of Medicine, Boston, MA 02118, United States. Electronic address: zluo@bu.edu.

Abstract

Activin A receptor type I or activin receptor-like kinase 2 (ACVRI/ALK2) belongs to type I TGF-β family and plays an important role in bone development. Activating mutations of ALK2 containing the R206 to H mutation, are present in 95% in the rare autosomal genetic disease fibrodysplasia ossificans progressiva (FOP), which leads to the development of ectopic bone formation in muscle. The effect of AMP-activated protein kinase (AMPK) activation on ALK2R206H-mediated signaling in fibroblasts obtained from a FOP patient was assessed in the present study. The activity of the mutated ALK2 was suppressed by pharmacological AMPK activators such as metformin and aspirin, while their actions were blocked by the dominant negative mutant of AMPK and mimicked by the constitutively active mutant of AMPK. Furthermore, activation of AMPK upregulated Smad6 and Smurf1 and thereby enhanced their interactions, resulting in its proteosome-dependent degradation of ALK2. In contrast, knockdown of Smad6 or Smurf1 prevented metformin-induced reduction of ALK2. To evaluate the biological relevance of AMPK action on ALK2 activity, we induced FOP fibroblasts into iPS cells and found that their osteogenic differentiation in vitro was inhibited by metformin. Our studies provide novel insight into potential approaches to treatment of FOP, since several AMPK activators (e.g. metformin, berberine, and aspirin) are already in clinical use for the treatment of diabetes and metabolic syndromes.

KEYWORDS:

AMP-activated protein kinase; Activin A receptor type I/activin receptor like kinase 2; Fibrodysplasia ossificans progressiva; Osteogenic differentiation; iPS

PMID:
28847510
PMCID:
PMC5660632
DOI:
10.1016/j.bbamcr.2017.08.009
[Indexed for MEDLINE]
Free PMC Article

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