Increased expression of FOXM1 delays natural and progeroid aging phenotypes

The FOXM1 member of the forkhead family of transcription factors is known for its pleiotropic C-terminus transcriptional and N-terminus non-transcriptional functions in a wide set of biological processes critical for cellular homeostasis. We previously found that FOXM1 repression during cellular aging accounts for the accrual of senescence phenotypes, which were vastly restored by overexpressing transcriptionally active FOXM1. Here, we found cyclic induction of a N-terminus truncated FOXM1 transgene on progeroid and naturally aged mice, to offset an aging-associated repression of full-length endogenous FoxM1, thereby allowing reinstatement of both transcriptional and non-transcriptional functions. This translated into mitigation of molecular and histopathological progeroid features of progeroid mice, significantly extending its lifespan. Notably, FOXM1 transgene induction also delayed the progressive accumulation of aging phenotypes, while extending the lifespan of naturally aged mice. Targeted transcriptome sequencing of aorta and skeletal muscle of 1.7y-old Rosa26 and FoxM1-dNdK mice