Ambivalent role of copper in inflammatory disorders

Area of Science:

• Biochemistry
• Pharmacology
• Immunology

Background:

• Soluble copper (Cu) preparations possess both irritant and anti-inflammatory properties in rats.
• Copper is a common ingredient in folk remedies for arthritis.
• Elevated serum copper levels are observed in patients with rheumatoid arthritis and ankylosing spondylitis.

Purpose of the Study:

• To investigate the anti-inflammatory activity of D-penicillamine (Pn)-copper complexes.
• To explore the mechanism of copper's action in inflammatory conditions.

Main Methods:

• Administration of soluble copper preparations and D-penicillamine (Pn) to rats.
• Induction of inflammation using carrageenan, oleyl alcohol, sodium urate, and adjuvants.
• Assessment of anti-inflammatory activity and copper-protein interactions.

Main Results:

• D-penicillamine (Pn) complexes with copper, forming low molecular weight compounds with significant anti-inflammatory activity in rat models.
• Pn can inhibit the amine-oxidase activity of caeruloplasmin, a copper-containing protein elevated during inflammation.
• Copper's in vivo distribution between different forms may be influenced by drugs, nutrition, and disease processes.

Conclusions:

• Copper-D-penicillamine (Cu-Pn) complexes demonstrate potent anti-inflammatory effects, comparable to established anti-inflammatory drugs.
• The interaction of D-penicillamine (Pn) with copper and its role in modulating copper-dependent enzymes like caeruloplasmin are key to its therapeutic potential.
• Understanding copper's dynamic behavior in vivo is crucial for developing effective arthritis treatments.