Fibronectin in acute and chronic inflammation

Area of Science:

• Biochemistry
• Immunology
• Rheumatology

Background:

• Fibronectin (Fn) is a high molecular weight glycoprotein.
• Emerging evidence suggests Fn's potential as an indicator protein in inflammatory conditions.
• Adjuvant-induced arthritis in rats serves as a model for chronic systemic inflammation.

Purpose of the Study:

• To investigate plasma fibronectin (Fn) levels in rats during various inflammatory disease states.
• To determine if Fn can serve as a biochemical marker for chronic systemic inflammation.

Main Methods:

• Rocket immunoelectrophoresis was employed to measure plasma Fn levels.
• The study utilized adjuvant-induced arthritis and carrageenan-induced inflammation models in rats.

Main Results:

• Plasma Fn levels in rats with adjuvant-induced arthritis doubled within 24 hours and remained elevated for over 4 months.
• Acute carrageenan-induced inflammation showed transiently increased plasma Fn levels within 24 hours, returning to normal within a week.
• Local inflammation (pleural carrageenan) did not alter plasma Fn levels, despite leukocyte accumulation.

Conclusions:

• Plasma fibronectin (Fn) levels are significantly elevated in chronic systemic inflammatory diseases like adjuvant-induced arthritis in rats.
• Fn shows potential as a sensitive and specific biochemical parameter for studying chronic inflammatory joint diseases.
• The response of plasma Fn levels varies depending on the type and chronicity of inflammation.