Immune aging - A mechanism in autoimmune disease

Area of Science:

• Immunology
• Gerontology
• Autoimmunity

Background:

• Immune aging is linked to increased autoimmunity.
• The immune system changes throughout life due to hematopoiesis, lymphogenesis, and environmental exposures.
• Older adults exhibit impaired responses to infections and tumors but accumulate aged immune cells, including age-associated B cells that produce autoantibodies.

Purpose of the Study:

• To review evidence linking immune aging to autoimmunity.
• To explore the cellular mechanisms underlying age-related autoimmune diseases.
• To identify potential therapeutic targets for autoimmune conditions.

Main Methods:

• Review of emerging scientific evidence.
• Analysis of cellular processes in immune aging.
• Focus on specific autoimmune diseases: rheumatoid arthritis and giant cell arteritis.

Main Results:

• Immune aging leads to accumulation of aged T cells, B cells, and myeloid cells.
• Cellular aging involves genomic instability, mitochondrial dysfunction, impaired proteostasis, and reduced autophagy.
• Malfunctioning mitochondria, lysosomes, and endoplasmic reticulum contribute to pathogenic immune cells driving rheumatoid arthritis and giant cell arteritis.

Conclusions:

• Immune aging is a significant risk factor for developing autoimmune diseases.
• Cellular aging processes, particularly mitochondrial and lysosomal dysfunction, are key drivers of autoimmunity.
• Targeting cellular repair mechanisms, such as mitochondria and lysosomes, presents a promising therapeutic strategy for autoimmune diseases.