Function of Mitochondrial Stat3 in Cellular Respiration

Author:

Wegrzyn Joanna12345,Potla Ramesh12345,Chwae Yong-Joon12345,Sepuri Naresh B. V.12345,Zhang Qifang12345,Koeck Thomas12345,Derecka Marta12345,Szczepanek Karol12345,Szelag Magdalena12345,Gornicka Agnieszka12345,Moh Akira12345,Moghaddas Shadi12345,Chen Qun12345,Bobbili Santha12345,Cichy Joanna12345,Dulak Jozef12345,Baker Darren P.12345,Wolfman Alan12345,Stuehr Dennis12345,Hassan Medhat O.12345,Fu Xin-Yuan12345,Avadhani Narayan12345,Drake Jennifer I.12345,Fawcett Paul12345,Lesnefsky Edward J.12345,Larner Andrew C.12345

Affiliation:

1. Department of Biochemistry and Molecular Biology and Massey Cancer Center, Virginia Commonwealth University, Richmond, VA 23298, USA.

2. Department of Medical Biotechnology, Faculty of Biochemistry, Biophysics, and Biotechnology, Jagiellonian University, Krakow, Poland.

3. Department of Biology, Cleveland State University, Cleveland, OH 44114, USA.

4. Department of Biochemistry, School of Life Sciences, University of Hyderabad, Hyderabad 500 046, India.

5. Department of Pathobiology, Lerner Research Institute, The Cleveland Clinic Foundation, 9500 Euclid Avenue, Cleveland, OH 44195, USA.

Abstract

Cytokines such as interleukin-6 induce tyrosine and serine phosphorylation of Stat3 that results in activation of Stat3-responsive genes. We provide evidence that Stat3 is present in the mitochondria of cultured cells and primary tissues, including the liver and heart. In Stat3 –/– cells, the activities of complexes I and II of the electron transport chain (ETC) were significantly decreased. We identified Stat3 mutants that selectively restored the protein's function as a transcription factor or its functions within the ETC. In mice that do not express Stat3 in the heart, there were also selective defects in the activities of complexes I and II of the ETC. These data indicate that Stat3 is required for optimal function of the ETC, which may allow it to orchestrate responses to cellular homeostasis.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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