Abstract
Since adult stem cells are responsible for replenishing tissues throughout life, it is vital to understand how failure to undergo apoptosis can dictate stem cell behavior both intrinsically and non-autonomously. Here, we report that depletion of pro-apoptotic Bax protein bestows hair follicle stem cells with the capacity to eliminate viable neighboring cells by sequestration of TNFα in their membrane. This in turn induces apoptosis in “loser” cells in a contact-dependent manner. Examining the underlying mechanism, we find that Bax loss-of-function competitive phenotype is mediated by the intrinsic activation of NFκB. Notably, winner stem cells differentially respond to TNFα, owing to their elevated expression of TNFR2. Finally, we report that in vivo depletion of Bax results in an increased stem cell pool, accelerating wound-repair and de novo hair follicle regeneration. Collectively, we establish a mechanism of mammalian cell competition, which can have broad therapeutic implications for tissue regeneration and tumorigenesis.
Original language | English |
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Article number | 7547 |
Journal | Nature Communications |
Volume | 14 |
Issue number | 1 |
DOIs | |
State | Published - 20 Nov 2023 |
Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2023, The Author(s).
Funding
We apologize to colleagues whose contributions we could not adequately cite because of space constraints. We thank M. Yampolsky for discussion and technical advice; M. Sarji, S. Chopra, and E. Zabari for technical assistance; Y. Mansour and A. Lutaty for help with FACS; N. Dahan and M. Duvshani-Eshet for Microscopy; V. Zlobin at the PCRA for health care of our mice; E. Bessar, G. Joels, G. Mendel, and A. Gelfand for technical support; and all past and present members of the Fuchs lab. Graphical abstract as well as Fig. and Fig. were generated using BioRender. Y.F. was supported by the EMBO Young Investigator program, ISF individual 2124/19, and IPMP 1019045-2029637 grants.
Funders | Funder number |
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European Molecular Biology Organization | |
Israel Science Foundation | IPMP 1019045-2029637 |