BubR1 hypomorphic mouse (BubR1H/H) |
BubR1 is a core protein of the spindle assembly checkpoint, a safeguard that ensures correct chromosome segregation. BubR1 hypomorphic mice produce 10% of the BubR1 protein. |
BubR1H/H is a model of accelerated ageing, as mice show markedly shortened lifespan and display several age-related diseases, including sarcopenia, cataracts, fat loss, arterial wall stiffening and impaired wound healing. BubR1H/H mice accumulate p16Ink4a-positive cells in several tissues, including adipose tissue, skeletal muscle and eye. |
[30,31] |
INK-ATTAC naturally aged mouse |
The INK-ATTAC transgene allows for selective elimination of p16Ink4a-positive cells upon administration of the synthetic drug AP20187, which induces dimerization of a membrane-bound myristoylated FK506-binding-protein-caspase 8 (FKBP-Casp8) fusion protein expressed specifically in senescent cells via the p16Ink4a promoter. Furthermore, an internal ribosome entry site (IRES) followed by an open reading frame (ORF) coding for enhanced green fluorescence protein (EGFP), which allows detection and collection of p16Ink4a-positive senescent cells is incorporated in the construct. |
Clearance of p16Ink4a-positive cells resulted in increased lifespan in male and female mice, delayed tumorigenesis and attenuated age-related diseases, including lipodystrophy, kidney dysfunction and cardiac dysfunction. Mechanistically, elimination of p16Ink4a-positive cells enhanced adipogenic transcription factors, reduced circulating levels of activin A and reduced fat accumulation in the liver of aged mice. |
[8,32,33▪▪] |
INK-ATTAC BubR1H/H mouse |
Incorporation of the INK-ATTAC transgene in the progeroid BubR1H/H mouse. |
Removal of p16Ink4a-positive cells in a model of accelerated ageing resulted in delayed onset of age-associated features, including sarcopenia, cataracts and lipodystrophy. |
[30] |