Cigdem Acioglu, Mete Bora Tuzuner, Muge Serhatli, Ceyda Acilan, Betul Sahin, Emel Akgun, Zelal Adiguzel, Busra Gurel and Ahmet Tarik Baykal* Pages 136 - 147 ( 12 )
Background and Objective: Antimycin A (AntA) is a potent Electron Transport System (ETS) inhibitor exerting its effect through inhibiting the transfer of the electrons by binding to the quinone reduction site of the cytochrome bc1 complex (Complex III), which is known to be impaired in Huntington’s Disease (HD). The current studies were undertaken to investigate the effect of complex III inhibition in the SH-SY5Y cell line to delineate the molecular and cellular processes, which may play a role in the pathogenesis of HD.
Method: We treated SH-SY5Y neuroblastoma cells with AntA in order to establish an in vitro mitochondrial dysfunction model for HD. Differential proteome analysis was performed by the nLCMS/ MS system. Protein expression was assessed by western blot analysis.
Results: Thirty five differentially expressed proteins as compared to the vehicle-treated controls were detected. Functional pathway analysis indicated that proteins involved in ubiquitin-proteasomal pathway were up-regulated in AntA-treated SH-SY5Y neuroblastoma cells and the ubiquitinated protein accumulation was confirmed by immunoblotting. We found that Prothymosin α (ProT α) was downregulated. Furthermore, we demonstrated that nuclear factor erythroid 2-related factor 2 (Nrf2) protein expression was co-regulated with ProT α expression, hence knockdown of ProT α in SH-SY5Y cells decreased Nrf2 protein level.
Conclusion: Our findings suggest that complex III impairment might downregulate ubiquitinproteasome function and NRF2/Keap1 antioxidant response. In addition, it is likely that downregulation of Nrf2 is due to the decreased expression of ProT α in AntA-treated SH-SY5Y cells. Our results could advance the understanding of mechanisms involved in neurodegenerative diseases.
ProT α, Nrf2/KEAP1, ubiquitin-proteasome system, label-free proteomics, mitochondrial complex III impairment, Huntington's Disease.
Department of Neurological Surgery, Reynolds Family Spine Laboratory, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ 07103, Research and Development Center, Acibadem Labmed Medical Laboratories, Istanbul, TUBITAK, Marmara Research Center, Genetic Engineering and Biotechnology Institute, 41470, Gebze, Kocaeli, School of Medicine, Research Center for Translational Medicine, Koc University, Istanbul, Research and Development Center, Acibadem Labmed Medical Laboratories, Istanbul, Research and Development Center, Acibadem Labmed Medical Laboratories, Istanbul, TUBITAK, Marmara Research Center, Genetic Engineering and Biotechnology Institute, 41470, Gebze, Kocaeli, Department of Medical Biochemistry, School of Medicine, Acibadem Mehmet Ali Aydinlar University, Istanbul, Department of Medical Biochemistry, School of Medicine, Acibadem Mehmet Ali Aydinlar University, Istanbul