Study summary · research use only
Targeted Apoptosis of Senescent Cells Restores Tissue Homeostasis in Response to Chemotoxicity and Aging
Plain-language summary
Paraphrased from the published abstract below — not a verdict on whether anything works.
In this mouse study, researchers identified FOXO4 as involved in senescent cell viability and designed a FOXO4 peptide that disrupts the FOXO4 interaction with p53. In senescent cells, the peptide was associated with p53 nuclear exclusion and cell-intrinsic apoptosis. Under in vivo conditions the authors describe as associated with few adverse effects, the FOXO4 peptide was reported to neutralize doxorubicin-induced chemotoxicity and to restore fitness, fur density, and renal function in both fast-aging XpdTTD/TTD mice and naturally aged mice. The authors describe targeting of senescent cells as feasible under conditions where loss of health has already occurred, with tissue homeostasis restored in this model.
Abstract
The accumulation of irreparable cellular damage restricts healthspan after acute stress or natural aging. Senescent cells are thought to impair tissue function, and their genetic clearance can delay features of aging. Identifying how senescent cells avoid apoptosis allows for the prospective design of anti-senescence compounds to address whether homeostasis can also be restored. Here, we identify FOXO4 as a pivot in senescent cell viability. We designed a FOXO4 peptide that perturbs the FOXO4 interaction with p53. In senescent cells, this selectively causes p53 nuclear exclusion and cell-intrinsic apoptosis. Under conditions where it was well tolerated in vivo, this FOXO4 peptide neutralized doxorubicin-induced chemotoxicity. Moreover, it restored fitness, fur density, and renal function in both fast aging XpdTTD/TTD and naturally aged mice. Thus, therapeutic targeting of senescent cells is feasible under conditions where loss of health has already occurred, and in doing so tissue homeostasis can effectively be restored.
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