Loss of Tob1 promotes muscle regeneration through muscle stem cell expansion

Author:

Kitajima Yasuo12,Yoshioka Kiyoshi1ORCID,Mikumo Yoko1,Ohki Shun2,Maehara Kazumitsu3ORCID,Ohkawa Yasuyuki3,Ono Yusuke14567ORCID

Affiliation:

1. Institute of Molecular Embryology and Genetics (IMEG), Kumamoto University 1 Department of Muscle Development and Regeneration , , Kumamoto, 860-0811 , Japan

2. Graduate School of Biomedical and Health Sciences, Hiroshima University 2 Department of Immunology , , Hiroshima, 734-8551 , Japan

3. Medical Institute of Bioregulation, Kyushu University 3 Division of Transcriptomics , , Fukuoka, 812-8582 , Japan

4. Center for Metabolic Regulation of Healthy Aging (CMHA) 4 , Faculty of Life Sciences , , Kumamoto, 860-8556 , Japan

5. Kumamoto University 4 , Faculty of Life Sciences , , Kumamoto, 860-8556 , Japan

6. Medical Research Center for High Depth Omics, Medical Institute of Bioregulation, Kyushu University 5 Division of Biological Regulation , , Fukuoka, 812-8582 , Japan

7. Research Team for Aging Science, Tokyo Metropolitan Institute for Geriatrics and Gerontology (TMIG) 6 Muscle Biology Laboratory , , Tokyo, 173-0015 , Japan

Abstract

ABSTRACT Muscle stem cells (MuSCs) play an indispensable role in postnatal muscle growth and hypertrophy in adults. MuSCs also retain a highly regenerative capacity and are therefore considered a promising stem cell source for regenerative therapy for muscle diseases. In this study, we identify tumor-suppressor protein Tob1 as a Pax7 target protein that negatively controls the population expansion of MuSCs. Tob1 protein is undetectable in the quiescent state but is upregulated during activation in MuSCs. Tob1 ablation in mice accelerates MuSC population expansion and boosts muscle regeneration. Moreover, inactivation of Tob1 in MuSCs ameliorates the efficiency of MuSC transplantation in a murine muscular dystrophy model. Collectively, selective targeting of Tob1 might be a therapeutic option for the treatment of muscular diseases, including muscular dystrophy and age-related sarcopenia.

Funder

Japan Science and Technology Agency

Japan Agency for Medical Research and Development

Grants-in-Aid for Scientific Research KAKENHI

Takeda Science Foundation

Medical Research Center Initiative for High Depth Omics

Inter-University Research Network for High-Depth Omics

Institute of Molecular Embryology and Genetics

Kumamoto University

Kyushu University

Ministry of Education, Culture, Sports, Science and Technology

Publisher

The Company of Biologists

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