Nothobranchius furzeri: a vertebrate model for studying cardiac aging and cellular senescence.

African turquoise killifish (Nothobranchius furzeri) is the shortest-lived vertebrate that can be bred in captivity, making it an ideal model organism for aging studies. However, whether the animal can be used for studying cardiac aging and whether cellular senescence contribute to this ageing process remain unclear. Here, we conducted a longitudinal study on the GRZ strain, aiming to identify phenotypic and functional markers for cardiac aging. We found that cardiac ageing in GRZ fish can be measured by comparing fish at 16 weeks to 8 weeks of age, using systemic markers such as body/fin coloration, body weight, BMI, cardiac ageing markers such as EF, E/A ratio, and swimming capacity, and cellular senescence markers such as SA-β-gal staining, p15/p16, γ-H2A.X, and SASP markers. Senolytic treatment with D (Dasatinib) and Q (Quercetin) from 12 to 16 weeks mitigated senescence and decelerated cardiac ageing. Together, our findings established GRZ as a useful vertebrate model for studying cardiac ageing and related cardiac senescence.