Nathan Shock Memorial Lecture 1992. Aging and immune function: cellular and biochemical analyses

Area of Science:

• Immunology
• Cellular Biology
• Aging Research

Background:

• T cell dysfunction is a hallmark of aging, contributing to immunosenescence.
• Defects in signaling pathways are implicated in age-related immune decline.

Purpose of the Study:

• To review recent findings on the cellular and molecular mechanisms underlying T cell dysfunction in aged mice.
• To highlight the roles of calcium signaling and protein kinase function in this process.

Main Methods:

• Review of existing literature on T cell function in aged mice.
• Analysis of cellular and molecular defects, including calcium signaling and protein kinase activity.

Main Results:

• Aged mice show accumulation of memory T cells, reducing naive T cells and interleukin-2 (IL-2) response.
• Memory T cells exhibit intrinsic resistance to calcium ion concentration increases, impairing activator responses.
• T cells from old mice display reduced serine/threonine and tyrosine-specific protein kinase signaling post-activation.

Conclusions:

• Age-related T cell dysfunction is characterized by impaired calcium signaling and protein kinase activity.
• The shift towards memory T cells in aging mice contributes to diminished immune responsiveness, particularly to IL-2.
• Understanding these molecular defects is crucial for addressing immunosenescence.