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Hemoglobin protects from streptococcal cell wall-induced arthritis.
N L McCartney-Francis1, X Y Song, D E Mizel
1National Institute of Dental and Craniofacial Research, NIH, Bethesda, Maryland 20892-4352, USA.
Arthritis and Rheumatism
|June 12, 1999
Summary
Hemoglobin (Hgb) effectively reduced nitric oxide (NO) levels, inflammation, and joint damage in arthritis models. This study suggests Hgb as a potential therapeutic for chronic arthritis by scavenging excess NO.
Area of Science:
- Rheumatology
- Immunology
- Biochemistry
Background:
- Inflammatory arthritis is characterized by joint inflammation and tissue damage.
- Nitric oxide (NO) plays a complex role in inflammatory processes.
- Excessive NO can contribute to inflammation and injury in arthritic conditions.
Purpose of the Study:
- To evaluate hemoglobin (Hgb) as a nitric oxide (NO) scavenger.
- To investigate Hgb's ability to reduce inflammation and injury in synovial tissue.
- To assess the therapeutic potential of NO depletion in inflammatory arthritis.
Main Methods:
- Streptococcal cell wall-induced arthritis model in rats.
- Systemic administration of hemoglobin (Hgb).
- Measurement of plasma nitrite/nitrate, iNOS, and cytokine mRNA in PBMC and joint tissue.
Main Results:
- Hgb administration significantly reduced plasma nitrite/nitrate and iNOS mRNA expression.
- Arthritic joint inflammation, cell accumulation, and pathology were markedly attenuated.
- Cytokine gene expression in the synovium decreased, correlating with reduced inflammation.
Conclusions:
- Modulating NO levels with Hgb impacts arthritis development and severity.
- Hemoglobin (Hgb) acts as an effective NO scavenger in an arthritis model.
- NO depletion via scavengers like Hgb shows promise for chronic arthritis treatment.