Nerve growth factor and autoimmune rheumatic diseases

Area of Science:

• Immunology
• Neuroscience
• Rheumatology

Background:

• Nerve growth factor (NGF) is crucial for neuronal survival and differentiation.
• Recent findings show immune cells synthesize NGF, with levels rising during inflammation.
• Cytokines like IL-1β and TNF-α stimulate NGF secretion, and immune cells express NGF receptors.

Purpose of the Study:

• To explore the hypothesis that NGF plays a role in the pathophysiology of autoimmune rheumatic diseases.

Main Methods:

• Review of existing studies on NGF expression in various autoimmune rheumatic conditions.
• Analysis of NGF levels in synovial fluid and serum of patients with arthritis, lupus, and scleroderma.
• Examination of NGF in animal models of arthritis and in transgenic mice expressing TNF-α.

Main Results:

• NGF is present in the synovial fluid of rheumatoid arthritis patients and in the synovium of animal models.
• Elevated NGF levels were observed in arthritic mice, including those with human TNF-α expression.
• Increased NGF was detected in the serum of systemic lupus erythematosus patients and the dermis of systemic sclerosis patients.

Conclusions:

• NGF is found in relevant tissues and biological fluids of patients with autoimmune rheumatic diseases.
• Evidence suggests a correlation between NGF and the inflammatory processes in these conditions.
• NGF is proposed to be involved in the pathophysiology of autoimmune rheumatic arthritis.