Tiam1 mediates Rac1 activation and contraction-induced glucose uptake in skeletal muscle cells
Contraction-stimulated glucose uptake in skeletal muscle requires Rac1, but the molecular mechanism of its activation is not fully understood. Treadmill running was applied to induce C57BL/6 mouse hind limb skeletal muscle contraction in vivo and electrical pulse stimulation contracted C2C12 myotube...
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Published in | The FASEB journal Vol. 35; no. 2; p. e21210 |
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Main Authors | , , , , , , , , , , , |
Format | Journal Article |
Language | English |
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United States
01.02.2021
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Abstract | Contraction-stimulated glucose uptake in skeletal muscle requires Rac1, but the molecular mechanism of its activation is not fully understood. Treadmill running was applied to induce C57BL/6 mouse hind limb skeletal muscle contraction in vivo and electrical pulse stimulation contracted C2C12 myotube cultures in vitro. The protein levels or activities of AMPK or the Rac1-specific GEF, Tiam1, were manipulated by activators, inhibitors, siRNA-mediated knockdown, and adenovirus-mediated expression. Activated Rac1 was detected by a pull-down assay and immunoblotting. Glucose uptake was measured using the 2-NBD-glucose fluorescent analog. Electrical pulse stimulated contraction or treadmill exercise upregulated the expression of Tiam1 in skeletal muscle in an AMPK-dependent manner. Axin1 siRNA-mediated knockdown diminished AMPK activation and upregulation of Tiam1 protein expression by contraction. Tiam1 siRNA-mediated knockdown diminished contraction-induced Rac1 activation, GLUT4 translocation, and glucose uptake. Contraction increased Tiam1 gene expression and serine phosphorylation of Tiam1 protein via AMPK. These findings suggest Tiam1 is part of an AMPK-Tiam1-Rac1 signaling pathway that mediates contraction-stimulated glucose uptake in skeletal muscle cells and tissue. |
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AbstractList | Contraction-stimulated glucose uptake in skeletal muscle requires Rac1, but the molecular mechanism of its activation is not fully understood. Treadmill running was applied to induce C57BL/6 mouse hind limb skeletal muscle contraction in vivo and electrical pulse stimulation contracted C2C12 myotube cultures in vitro. The protein levels or activities of AMPK or the Rac1-specific GEF, Tiam1, were manipulated by activators, inhibitors, siRNA-mediated knockdown, and adenovirus-mediated expression. Activated Rac1 was detected by a pull-down assay and immunoblotting. Glucose uptake was measured using the 2-NBD-glucose fluorescent analog. Electrical pulse stimulated contraction or treadmill exercise upregulated the expression of Tiam1 in skeletal muscle in an AMPK-dependent manner. Axin1 siRNA-mediated knockdown diminished AMPK activation and upregulation of Tiam1 protein expression by contraction. Tiam1 siRNA-mediated knockdown diminished contraction-induced Rac1 activation, GLUT4 translocation, and glucose uptake. Contraction increased Tiam1 gene expression and serine phosphorylation of Tiam1 protein via AMPK. These findings suggest Tiam1 is part of an AMPK-Tiam1-Rac1 signaling pathway that mediates contraction-stimulated glucose uptake in skeletal muscle cells and tissue. |
Author | Zhao, Xiaoyun Yang, Jianming Zhang, Youyi Lv, Xiaoting Duan, Hongquan Yue, Yingying Zhang, Chang Chen, Liming Yao, Zhi Liu, Sasa Niu, Wenyan Zhang, Shitian |
Author_xml | – sequence: 1 givenname: Yingying surname: Yue fullname: Yue, Yingying organization: Department of Pharmacy, General Hospital, Tianjin Medical University, Tianjin, China – sequence: 2 givenname: Chang surname: Zhang fullname: Zhang, Chang organization: Department of Pharmacy, General Hospital, Tianjin Medical University, Tianjin, China – sequence: 3 givenname: Xiaoyun surname: Zhao fullname: Zhao, Xiaoyun organization: Department of Pharmacy, General Hospital, Tianjin Medical University, Tianjin, China – sequence: 4 givenname: Sasa surname: Liu fullname: Liu, Sasa organization: Department of Pharmacy, General Hospital, Tianjin Medical University, Tianjin, China – sequence: 5 givenname: Xiaoting surname: Lv fullname: Lv, Xiaoting organization: Clinical Laboratory, Cangzhou People's Hospital, Cangzhou, China – sequence: 6 givenname: Shitian surname: Zhang fullname: Zhang, Shitian organization: Department of Pharmacy, General Hospital, Tianjin Medical University, Tianjin, China – sequence: 7 givenname: Jianming surname: Yang fullname: Yang, Jianming organization: Department of Pharmacy, General Hospital, Tianjin Medical University, Tianjin, China – sequence: 8 givenname: Liming surname: Chen fullname: Chen, Liming organization: Department of Pharmacy, General Hospital, Tianjin Medical University, Tianjin, China – sequence: 9 givenname: Hongquan surname: Duan fullname: Duan, Hongquan organization: Department of Pharmacy, General Hospital, Tianjin Medical University, Tianjin, China – sequence: 10 givenname: Youyi surname: Zhang fullname: Zhang, Youyi organization: Institute of Vascular Medicine, Peking University Third Hospital, Beijing, China – sequence: 11 givenname: Zhi surname: Yao fullname: Yao, Zhi organization: Department of Pharmacy, General Hospital, Tianjin Medical University, Tianjin, China – sequence: 12 givenname: Wenyan orcidid: 0000-0001-7481-1576 surname: Niu fullname: Niu, Wenyan organization: Department of Pharmacy, General Hospital, Tianjin Medical University, Tianjin, China |
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Snippet | Contraction-stimulated glucose uptake in skeletal muscle requires Rac1, but the molecular mechanism of its activation is not fully understood. Treadmill... |
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Title | Tiam1 mediates Rac1 activation and contraction-induced glucose uptake in skeletal muscle cells |
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