The C57B1/6 nu/nu, lpr/lpr mouse. III. Autoimmunity status

Area of Science:

• Immunology
• Genetics
• Autoimmunity

Background:

• The lymphoproliferation (lpr) gene in C57B1/6 mice is associated with lymphadenopathy and autoimmunity.
• The nude (nu) gene results in athymic mice, lacking mature T cells.

Purpose of the Study:

• To investigate the role of the lpr gene in lymphadenopathy and autoimmunity.
• To determine if the lpr gene's effects on B cell activity are T cell-dependent.

Main Methods:

• Comparison of four mouse groups with combinations of lpr and nu genes on a B6 background.
• Assessment of lymphadenopathy (cervical lymph node enlargement).
• Evaluation of B cell hyperactivity and autoimmunity through serum antibody analyses.

Main Results:

• Lymphadenopathy was observed only in B6 +/+, lpr/lpr mice.
• Elevated serum immunoglobulin levels and various autoantibodies were detected in lpr/lpr mice.
• B6 nu/nu, lpr/lpr mice showed higher immunoglobulin and autoantibody levels than normal B6 nu/nu, +/+ mice, but lower than B6 +/+, lpr/lpr mice.

Conclusions:

• The lpr gene influences B cell activity independently of T lineage cells.
• The autoimmune effects of the lpr gene do not necessitate the T cell proliferation seen in B6 +/+, lpr/lpr mice.