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Methionine restriction delays aging-related urogenital diseases in male Fischer 344 rats
Despina Komninou1, Virginia L Malloy2, Jay A Zimmerman2
1Technological Educational Institute of Thessaloniki, Thessaloniki, Greece.
Abstract:
Dietary methionine restriction (MR) has been found to enhance longevity across many species. We hypothesized that MR might enhance longevity in part by delaying or inhibiting age-related disease processes. To this end, male Fischer 344 rats were fed control (CF, 0.86% methionine) or MR (0.17% methionine) diets throughout their life until sacrifice at approximately 30 months of age, and histopathology was performed to identify the incidence and progression of two important aging-related pathologies, namely, chronic progressive nephropathy (CPN) and testicular tumorigenesis. Although kidney pathology was observed in 87% CF rats and CPN in 62% of CF animals, no evidence of kidney disease was observed in MR rats. Consistent with the absence of renal pathology, urinary albumin levels were lower in the MR group compared to controls throughout the study, with over a six-fold difference between the groups at 30 months of age. Biomarkers associated with renal disease, namely, clusterin, cystatin C, and β-2 microglobulin, were reduced following 18 months of MR. A reduction in testicular tumor incidence from 88% in CF to 22% in MR rats was also observed. These results suggest that MR may lead to metabolic and cellular changes providing protection against age-related diseases.
Insights
Dietary methionine restriction (MR) significantly delays age-related diseases, including kidney pathology and testicular tumors, in rats. This suggests MR may offer protection against aging processes.
Area of Science:
- Gerontology
- Nutritional Science
- Pathology
Background:
- Dietary methionine restriction (MR) is known to extend lifespan in various species.
- The potential of MR to mitigate age-related diseases remains an area of investigation.
Purpose of the Study:
- To investigate the impact of MR on age-related pathologies, specifically chronic progressive nephropathy (CPN) and testicular tumorigenesis.
- To determine if MR delays or inhibits the progression of these aging-related diseases.
Main Methods:
- Male Fischer 344 rats were fed either a control diet (CF) or an MR diet for their lifespan.
- Histopathology was used to assess kidney and testicular tissues for age-related pathologies.
- Urinary albumin and specific renal disease biomarkers were measured.
Main Results:
- No kidney disease was observed in MR rats, compared to 87% incidence in CF rats.
- Testicular tumor incidence was significantly reduced from 88% in CF rats to 22% in MR rats.
- MR rats showed lower urinary albumin and reduced levels of clusterin, cystatin C, and β-2 microglobulin.
Conclusions:
- Dietary methionine restriction demonstrates a protective effect against key age-related diseases in rats.
- MR may induce metabolic and cellular changes that confer resistance to aging pathologies.
- These findings support MR as a potential intervention for promoting healthy aging.
