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Title : Aging And Body Repair
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Aging And Body Repair

Aging is associated with a decline in the ability of the body to repair itself, including tissue and (at least partial) body part regeneration, with mechanisms that may include: “aging, increased Wnt signaling, NF-κB and tumor suppressor activity, and loss of positional information hampers regeneration.” This will enable, as the authors also state “safely activate endogenous regeneration in the elderly, and to generate a regeneration-permissive environment for cell therapies.”  Abstract:

Aging is associated with a significant decline of tissue repair and regeneration, ultimately resulting in tissue dysfunction, multimorbidity, and death. Salamanders possess remarkable regenerative abilities and have been studied with the prospect of inducing regeneration in humans and counteracting regenerative decline with aging. However, epimorphic regeneration, the full replacement of amputated structures, also occurs in mammals. One of the best studied models is digit tip regeneration, which is described for mice, and occurs in humans in a comparable manner. To accomplish regeneration, the amputated digit tip has to undergo three interdependent, overlapping steps: (i) wound healing without formation of a scar; (ii) formation of a blastema, a highly proliferative cell mass; and (iii) spatiotemporally regulated differentiation to generate a pattern similar to the original structure. Aging likely interferes with each of these steps. In this article, we provide an overview of the critical signaling pathways for regeneration, as revealed by investigating mammalian digit regeneration, the possible impact of aging on these pathways, and approaches to induce regeneration in the elderly. We hypothesize that with aging, increased Wnt signaling, NF-κB and tumor suppressor activity, and loss of positional information hampers regeneration. Knowledge about the impact of aging on regenerative mechanisms will enable us to safely activate endogenous regeneration in the elderly, and to generate a regeneration-permissive environment for cell therapies.

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