1932

Abstract

Although tissue homeostasis—the steady state—implies stability, our organs are in a state of continual, large-scale cellular flux. This flux underpins an organ's ability to homeostatically renew, to non-homeostatically resize upon altered functional demand, and to return to homeostasis after resizing or injury—in other words, to be dynamic. Here, I examine the basic unit of organ-scale cell dynamics: the cellular life cycle of birth, differentiation, and death. Focusing on epithelial organs, I discuss how spatial patterns and temporal kinetics of life cycle stages depend upon lineage organization and tissue architecture. I review how signaling between stages coordinates life cycle dynamics to enforce homeostasis, and I highlight how particular stages are transiently unbalanced to drive organ resizing or repair. Finally, I offer that considering organs as a collective of not cells but rather cell life cycles provides a powerful vantage for deciphering homeostatic and non-homeostatic tissue states.

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2022-10-06
2024-06-17
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