Dietary folate improves age-related decreases in lymphocyte function

Area of Science:

• Immunology
• Nutrition Science
• Gerontology

Background:

• Low folate status is common in older adults, but its impact on immunity is understudied.
• Aging affects T cell distribution, immune cell proliferation, and cytokine production.

Purpose of the Study:

• To investigate the effects of folate supplementation on immune cell function in aging rats.
• To determine if increased folate intake can mitigate age-related immune decline.

Main Methods:

• Male Fisher 344 rats (11 and 23 months old) were fed a control diet or a folate-supplemented diet for 3 weeks.
• Immune cell responses in spleen and mesenteric lymph nodes (MLNs) were analyzed, including cell proliferation and cytokine production.
• Serum folate and vitamin B12 levels were measured.

Main Results:

• Folate supplementation increased serum folate and vitamin B12 levels and improved immune cell proliferation.
• Folate increased T cell proportion in MLNs and prevented age-related decreases in spleen interferon-alpha production.
• Folate supplementation modulated T-helper cell responses and increased interleukin-4 production in MLNs.

Conclusions:

• Dietary folate supplementation can enhance immune function in aging rats.
• Older populations may require higher folate intake to maintain optimal immune responses.
• Folate plays a crucial role in supporting immune cell proliferation, distribution, and cytokine profiles during aging.