Collagen induced arthritis: Reversal by mercaptoethylguanidine, a novel antiinflammatory agent with a combined mechanism of action

Ernest Brahn, Mona Lisa Banquerigo, Gary S. Firestein, David L. Boyle, Andrew L. Salzman, Csaba Szabo

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Objective. We recently identified mercaptoethylguanidine (MEG) as an antiinflammatory agent with a combined mechanism of action. Its effects include inhibition of the inducible isoform of nitric oxide synthase (iNOS), scavenging peroxynitrite, a cytotoxic oxidant species produced from nitric oxide (NO) and superoxide, and inhibition of cyclooxygenase (COX). We investigate the effect of MEG in collagen induced arthritis (CIA). Methods. Syngeneic LOU rats were immunized with native type II collagen on Day 0. After clinical signs of arthritis developed on Day 10, treatment with MEG was initiated (30 mg/kg ip tid) and continued until sacrifice on Day 28. Serum nitrite/nitrate was measured in control animals, at arthritis onset and 2 days after the start of MEG treatment. Clinical scores were obtained daily. At Day 28, radiographic scores were obtained, and joints were harvested for the measurement of mRNA for tumor necrosis factor-α (TNF-α), collagenase, and stromelysin. Results. Serum nitrite/nitrate increased from 7.9 ± 0.7 mM (baseline) to 13.5 ± 2.6 at arthritis onset (p < 0.05). Within 48 h of MEG treatment, nitrite/nitrate levels fell to 7.2 ± 1.1 (p < 0.05). By Day 28, clinical arthritis scores (measured on a scale of 0-8) were 7.1 ± 0.6 in the vehicle group compared to 1.4 ± 0.6 in the MEG treated group (p < 0.0001). Radiographic scores (scale 0-6) on Day 28 were reduced from 4.9 ± 0.6 to 0.6 ± 0.4 (p < 0.0002) by MEG treatment. MEG reduced the synovial expression of mRNA for TNF-α, collagenase, and stromelysin by 72, 67, and 52%, respectively. Conclusion. These data show that MEG has beneficial effects on established CIA. The mechanism of action may be related to inhibition of synovial iNOS expression or activity, inhibition of COX, scavenging of peroxynitrite, with subsequent inhibition of angiogenesis, metalloproteinase, and TNF-α expression.

Original languageEnglish (US)
Pages (from-to)1785-1793
Number of pages9
JournalJournal of Rheumatology
Volume25
Issue number9
StatePublished - Sep 1998
Externally publishedYes

Fingerprint

Experimental Arthritis
Anti-Inflammatory Agents
Arthritis
Nitrites
Nitrates
Matrix Metalloproteinase 3
Peroxynitrous Acid
Tumor Necrosis Factor-alpha
Collagenases
Prostaglandin-Endoperoxide Synthases
Protein Isoforms
2-mercaptoethylguanidine
Messenger RNA
Collagen Type II
Metalloproteases
Nitric Oxide Synthase Type II
Serum
Oxidants
Nitric Oxide Synthase
Superoxides

Keywords

  • Arthritis
  • Collagenase
  • Free radical
  • Inflammation superoxide
  • Tumor necrosis factor

ASJC Scopus subject areas

  • Rheumatology
  • Immunology

Cite this

Collagen induced arthritis : Reversal by mercaptoethylguanidine, a novel antiinflammatory agent with a combined mechanism of action. / Brahn, Ernest; Banquerigo, Mona Lisa; Firestein, Gary S.; Boyle, David L.; Salzman, Andrew L.; Szabo, Csaba.

In: Journal of Rheumatology, Vol. 25, No. 9, 09.1998, p. 1785-1793.

Research output: Contribution to journalArticle

Brahn, Ernest ; Banquerigo, Mona Lisa ; Firestein, Gary S. ; Boyle, David L. ; Salzman, Andrew L. ; Szabo, Csaba. / Collagen induced arthritis : Reversal by mercaptoethylguanidine, a novel antiinflammatory agent with a combined mechanism of action. In: Journal of Rheumatology. 1998 ; Vol. 25, No. 9. pp. 1785-1793.
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AU - Brahn, Ernest

AU - Banquerigo, Mona Lisa

AU - Firestein, Gary S.

AU - Boyle, David L.

AU - Salzman, Andrew L.

AU - Szabo, Csaba

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N2 - Objective. We recently identified mercaptoethylguanidine (MEG) as an antiinflammatory agent with a combined mechanism of action. Its effects include inhibition of the inducible isoform of nitric oxide synthase (iNOS), scavenging peroxynitrite, a cytotoxic oxidant species produced from nitric oxide (NO) and superoxide, and inhibition of cyclooxygenase (COX). We investigate the effect of MEG in collagen induced arthritis (CIA). Methods. Syngeneic LOU rats were immunized with native type II collagen on Day 0. After clinical signs of arthritis developed on Day 10, treatment with MEG was initiated (30 mg/kg ip tid) and continued until sacrifice on Day 28. Serum nitrite/nitrate was measured in control animals, at arthritis onset and 2 days after the start of MEG treatment. Clinical scores were obtained daily. At Day 28, radiographic scores were obtained, and joints were harvested for the measurement of mRNA for tumor necrosis factor-α (TNF-α), collagenase, and stromelysin. Results. Serum nitrite/nitrate increased from 7.9 ± 0.7 mM (baseline) to 13.5 ± 2.6 at arthritis onset (p < 0.05). Within 48 h of MEG treatment, nitrite/nitrate levels fell to 7.2 ± 1.1 (p < 0.05). By Day 28, clinical arthritis scores (measured on a scale of 0-8) were 7.1 ± 0.6 in the vehicle group compared to 1.4 ± 0.6 in the MEG treated group (p < 0.0001). Radiographic scores (scale 0-6) on Day 28 were reduced from 4.9 ± 0.6 to 0.6 ± 0.4 (p < 0.0002) by MEG treatment. MEG reduced the synovial expression of mRNA for TNF-α, collagenase, and stromelysin by 72, 67, and 52%, respectively. Conclusion. These data show that MEG has beneficial effects on established CIA. The mechanism of action may be related to inhibition of synovial iNOS expression or activity, inhibition of COX, scavenging of peroxynitrite, with subsequent inhibition of angiogenesis, metalloproteinase, and TNF-α expression.

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