Food restriction slows down age-related changes in cell membrane parameters

Area of Science:

• Cell Biology
• Gerontology
• Nutritional Science

Background:

• Aging is associated with detrimental changes in plasma membrane properties.
• Undernutrition is known to influence cellular processes and longevity.
• The specific effects of intermittent diet restriction on membrane parameters during aging require further elucidation.

Purpose of the Study:

• To investigate the impact of every-other-day (EOD) diet restriction on plasma membrane parameters in aging female Wistar rats.
• To assess whether EOD diet restriction can mitigate age-related decline in membrane function and receptor density.
• To correlate changes in membrane microviscosity with lymphocyte proliferative responses.

Main Methods:

• Female Wistar rats were subjected to an EOD feeding schedule starting at 3.5 months of age.
• Plasma membrane microviscosity was measured using 1,6-diphenyl-1,3,5-hexatriene.
• Enzyme activity (5'-nucleotidase) and beta-adrenoceptor density were analyzed in splenic lymphocytes, liver, and cerebellar tissues.

Main Results:

• EOD-fed rats exhibited lower splenic lymphocyte membrane microviscosity compared to ad libitum (AL) fed rats, correlating with improved lymphocyte proliferation.
• Arrhenius plot analysis indicated diet-dependent improvements in liver plasma membrane properties.
• Diet restriction partially restored the age-related decrease in cerebellar beta-adrenoceptor density, but did not affect lymphocyte beta-adrenoceptor density.

Conclusions:

• Undernutrition, specifically EOD diet restriction, exerts a protective effect on cell membranes in aging animals.
• Dietary interventions can improve age-associated alterations in membrane properties and receptor function.
• These findings suggest that modulating nutrition may be a strategy to counteract cellular aging processes.