Development of autoimmunity in IL-14alpha-transgenic mice

Area of Science:

• Immunology
• Genetics
• Pathology

Background:

• Systemic lupus erythematosus (SLE) is a complex autoimmune disease influenced by multiple genetic factors.
• Genes on chromosome 4 have been implicated in murine models of SLE.
• Interleukin-14 (IL-14) is a cytokine known as a B cell growth factor, with its gene located on chromosome 4.

Purpose of the Study:

• To investigate the role of IL-14alpha in the development of autoimmunity and lymphomagenesis.
• To create and analyze IL-14alpha-transgenic mice as a model for studying these conditions.

Main Methods:

• Production of IL-14alpha-transgenic mice.
• Assessment of B cell populations, serum immunoglobulin levels, and antibody responses.
• Clinical and pathological evaluation for autoimmune manifestations and lymphoma development.

Main Results:

• IL-14alpha-transgenic mice exhibited increased B1 cells, elevated serum IgM, IgG, and IgG2a, and enhanced immune responses.
• Older transgenic mice developed autoantibodies, sialadenitis, nephritis consistent with SLE, and high incidence of CD5+ B cell lymphomas.
• These findings occurred between 9-18 months of age.

Conclusions:

• IL-14alpha plays a significant role in promoting autoimmunity and lymphomagenesis.
• The study provides a potential genetic link between autoimmune disorders like SLE and Sjögren's syndrome and lymphomagenesis.
• IL-14alpha may be a key factor in the pathogenesis of these related conditions.