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Singh K, Maity P, Krug L, Meyer P, Treiber N, Lucas T, Basu A, Kochanek S, Wlaschek M, Geiger H, Scharffetter-Kochanek K. Superoxide anion radicals induce IGF-1 resistance through concomitant activation of PTP1B and PTEN. EMBO Mol Med 2015; 7:59-77. [PMID: 25520316 PMCID: PMC4309668 DOI: 10.15252/emmm.201404082] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The evolutionarily conserved IGF-1 signalling pathway is associated with longevity, metabolism, tissue homeostasis, and cancer progression. Its regulation relies on the delicate balance between activating kinases and suppressing phosphatases and is still not very well understood. We report here that IGF-1 signalling in vitro and in a murine ageing model in vivo is suppressed in response to accumulation of superoxide anions () in mitochondria, either by chemical inhibition of complex I or by genetic silencing of -dismutating mitochondrial Sod2. The -dependent suppression of IGF-1 signalling resulted in decreased proliferation of murine dermal fibroblasts, affected translation initiation factors and suppressed the expression of α1(I), α1(III), and α2(I) collagen, the hallmarks of skin ageing. Enhanced led to activation of the phosphatases PTP1B and PTEN, which via dephosphorylation of the IGF-1 receptor and phosphatidylinositol 3,4,5-triphosphate dampened IGF-1 signalling. Genetic and pharmacologic inhibition of PTP1B and PTEN abrogated -induced IGF-1 resistance and rescued the ageing skin phenotype. We thus identify previously unreported signature events with , PTP1B, and PTEN as promising targets for drug development to prevent IGF-1 resistance-related pathologies.
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Affiliation(s)
- Karmveer Singh
- Department of Dermatology and Allergic Diseases, University of Ulm, Ulm, Germany Aging Research Center (ARC), Ulm, Germany
| | - Pallab Maity
- Department of Dermatology and Allergic Diseases, University of Ulm, Ulm, Germany Aging Research Center (ARC), Ulm, Germany
| | - Linda Krug
- Department of Dermatology and Allergic Diseases, University of Ulm, Ulm, Germany Aging Research Center (ARC), Ulm, Germany
| | - Patrick Meyer
- Department of Dermatology and Allergic Diseases, University of Ulm, Ulm, Germany Aging Research Center (ARC), Ulm, Germany
| | - Nicolai Treiber
- Department of Dermatology and Allergic Diseases, University of Ulm, Ulm, Germany
| | - Tanja Lucas
- Department of Gene Therapy, University of Ulm, Ulm, Germany
| | - Abhijit Basu
- Department of Dermatology and Allergic Diseases, University of Ulm, Ulm, Germany
| | | | - Meinhard Wlaschek
- Department of Dermatology and Allergic Diseases, University of Ulm, Ulm, Germany Aging Research Center (ARC), Ulm, Germany
| | - Hartmut Geiger
- Department of Dermatology and Allergic Diseases, University of Ulm, Ulm, Germany Aging Research Center (ARC), Ulm, Germany Institute of Molecular Medicine and Stem Cell Aging, University of Ulm, Ulm, Germany Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center and University of Cincinnati, Cincinnati, OH, USA
| | - Karin Scharffetter-Kochanek
- Department of Dermatology and Allergic Diseases, University of Ulm, Ulm, Germany Aging Research Center (ARC), Ulm, Germany
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Inflammatory activity modulation by hypertonic saline and pentoxifylline in a rat model of strangulated closed loop small bowel obstruction. Int J Surg 2014; 12:594-600. [DOI: 10.1016/j.ijsu.2014.04.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2013] [Revised: 04/09/2014] [Accepted: 04/19/2014] [Indexed: 11/19/2022]
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Su X, Guo S, Huang X, Wang X, Qi D, Yang C. Control of oxidative reactions of hemoglobin in the design of blood substitutes: role of the Vc, NAC, TEMPO and their reductant system. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2013; 42:222-8. [PMID: 24053379 DOI: 10.3109/21691401.2013.834907] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Oxidative reactions of hemoglobin (Hb) are still a serious problem for Hb-based blood substitute development. Although varieties of antioxidant strategies have been suggested, this in vitro study examined the ability of the ascorbate, N-Acetyl-L-Cysteine (NAC), 4-hydroxy-2, 2, 6, 6-tetramethylpiperidine-1-oxygen free radicals (TEMPO) and their reductant system in preventing Hb oxidation. The content of ferric Hb is monitored in the process of vitamin C (Vc), NAC, TEMPO and their reductant system. The results suggest that ascorbate is effective in reducing ferryl Hb, and TEMPO with Vc/NAC could obviously shorten the reaction time, but it does not play the role of Met-Hb reductases. It demonstrates that TEMPO did little to recover Hb under oxidative stress.
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Affiliation(s)
- Xiulan Su
- School of Environment and Chemical Engineering, Tianjin Polytechnic University , Tianjin , P. R. China
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