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Increased lifespan in hyposulfatemic NaS1 null mice
Daniel Markovich1, Mei-Chun Ku, Dzaidenny Muslim
1Molecular Physiology Group, School of Biomedical Sciences, University of Queensland, Brisbane, QLD 4072, Australia. d.markovich@uq.edu.au
Experimental Gerontology
|June 10, 2011
Summary
Mice with low sulfate levels lived longer and had fewer liver tumors. This suggests a role for sulfate in mammalian aging and cancer prevention.
Area of Science:
- Biochemistry
- Genetics
- Gerontology
Background:
- Sulfate (SO(4)(2-)) is crucial for mammalian growth and development.
- Perturbing sulfate homeostasis may impact aging and disease.
- The NaS1 null (Nas1-/-) mouse model exhibits hyposulfatemia.
Purpose of the Study:
- To investigate the effects of hyposulfatemia on longevity in mice.
- To explore the relationship between sulfate levels, aging, and cancer in a mammalian model.
Main Methods:
- Utilized NaS1 null (Nas1-/-) mice to create a hyposulfatemic state.
- Measured median life spans and serum sulfate levels.
- Analyzed hepatic gene expression (Sirt1, Cat, Hdac3, Trp53, Cd55) via RT-PCR.
- Performed histological analyses of liver tissue for neoplasms.
Main Results:
- Nas1-/- mice exhibited a ≈25% increase in median life span compared to controls.
- Serum sulfate levels were significantly lower in Nas1-/- mice (≈0.16 mM) versus Nas1+/+ mice (≈0.96 mM).
- Increased hepatic mRNA expression of aging-related genes (Sirt1, Cat, Hdac3, Trp53, Cd55) was observed in Nas1-/- mice.
- Liver neoplasms were absent in 2-year-old Nas1-/- mice, contrasting with >50% incidence in Nas1+/+ mice.
Conclusions:
- Hyposulfatemia in Nas1-/- mice is associated with increased longevity.
- Reduced sulfate levels may protect against hepatic tumor development.
- Sulfate homeostasis potentially influences mammalian aging and cancer susceptibility.
