Strain-specificity in the hydrogen sulphide signalling network following dietary restriction in recombinant inbred...

Modulation of the ageing process by dietary restriction (DR) across multiple taxa is well established. While the exact mechanism through which DR acts remains elusive, the gasotransmitter hydrogen sulphide (H₂S) may play an important role. We employed a comparative-type approach using females from three ILSXISS recombinant inbred mouse strains previously reported to show differential lifespan responses following 40% DR. Following long-term (10 months) 40% DR, strain TejJ89-reported to show lifespan extension under DR-exhibited elevated hepatic H₂S production relative to its strain-specific ad libitum (AL) control. Strain TejJ48 (no reported lifespan effect following 40% DR) exhibited significantly reduced hepatic H₂S production, while H₂S production was unaffected by DR in strain TejJ114 (shortened lifespan reported following 40% DR). These differences in H₂S production were reflected in highly divergent gene and protein expression profiles of the major H₂S production and disposal enzymes across strains. Increased hepatic H₂S production in TejJ89 mice was associated with elevation of the mitochondrial H₂S-producing enzyme 3-mercaptopyruvate sulfurtransferase (MPST). Our findings further support the potential role of H₂S in DR-induced longevity and indicate the presence of genotypic-specificity in the production and disposal of hepatic H₂S in response to 40% DR in mice.