Location: Jean Mayer Human Nutrition Research Center On Aging
Project Number: 8050-51000-100-001-S
Project Type: Non-Assistance Cooperative Agreement
Start Date: May 14, 2019
End Date: Sep 30, 2023
Objective 1: Determine the effect of nutritional intervention such as vitamin E on immune and inflammatory responses and resistance to infection using appropriate human and animal models. Sub-objective 1A: Establish the effects of vitamin E supplementation on the incidence and severity of human rhinovirus infection in healthy community dwelling older adults. Sub-objective 1B: Understand the mechanistic basis for vitamin E-mediated changes in incidence and severity of common cold. Objective 2: Determine the life-long effect and underlying mechanisms of food components such as fruits and vegetables on life and health span through longitudinal intervention trials using appropriate animal models. Sub-objective 2A: Determine the effect of long term fruit and vegetable consumption on key biological functions, pathologies, and median life span in lean and obese mice. Sub-objective 2B: Determine the underlying mechanism of fruit and vegetable impact on life- and health-span in normal weight and obese mice.
Aging is associated with dysregulation of immune and inflammatory responses, which contribute to higher morbidity and mortality from several infectious and noninfectious chronic diseases associated with aging. Nutritional status, through maintaining healthy metabolic activity, and immune and inflammatory responses, is a key factor in enhancing health- and life-span. Our long-term goal is to determine the underlying mechanisms of age-related immune and inflammatory dysregulation in order to develop nutritional interventions to prevent/reduce these alterations. Objective 1 will determine the impact and underlying mechanisms of vitamin E on human rhinovirus (HRV)-induced infection (common cold) utilizing a double-blind, randomized, placebo-controlled trial in healthy community-dwelling older adults. Efficacy of vitamin E will be assessed following exposure to HRV by disease incidence and severity, viral shedding, anti-viral immune response, oxidative stress, and expression of signature genes. Objective 2 will determine effect of long-term consumption of fruits and vegetables on median life-span and key immune and metabolic functions at different life stages in an animal model (normal weight and obese mice). Both longitudinal and cross-sectional design will be used to gain insight into causaul relationship between increasing fruits and vegetable consumption and promotion of health- and life-span. Mechanistic investigation will focus on inflammation, oxidative stress, sphingolipid (particularly ceramide) metabolism, and gut microbiota. The results generated from these studies will help develop effective nutritional strategies to delay/mitigate age-related diseases leading to increased health- and life-span.