Increased Pulmonary Oxidative Stress in COX-2 Knockdown Mice with Mild Pulmonary Hypertension
Author Information
Author(s): Seta Francesca, Rahmani Mahboubeh, Turner Patricia V., Funk Colin D.
Primary Institution: Department of Biomedical and Molecular Sciences, Queen's University, Kingston, Ontario, Canada
Hypothesis
The study aims to examine the role of cyclooxygenase-2 (COX-2) and downstream signaling of prostanoids in the pathogenesis of pulmonary hypertension (PH) using mice with genetically manipulated COX-2 expression.
Conclusion
The study suggests that increased oxidative stress-derived endothelial dysfunction, vasoconstriction, and mild inflammation, exacerbated by the lack of COX-2, contribute to the early stages of pulmonary hypertension.
Supporting Evidence
- COX-2 knockdown mice showed increased oxidative stress indicators compared to wild-type mice.
- Monocrotaline treatment resulted in increased right ventricular systolic pressure in both COX-2 knockdown and wild-type mice.
- Histopathological analysis revealed mild inflammation and perivascular edema in the lungs of treated mice.
Takeaway
Researchers looked at mice with reduced COX-2 and found that they had more oxidative stress and some signs of lung problems when given a drug that usually causes high blood pressure in the lungs.
Methodology
COX-2 knockdown and wild-type mice were treated with monocrotaline weekly for 10 weeks, followed by assessments of cardiac function, right ventricular pressure, and lung histopathology.
Limitations
The study found only modest hemodynamic changes in mice despite significant oxidative stress, indicating limitations in using monocrotaline as a model for pulmonary hypertension in mice.
Participant Demographics
Mice used were COX-2 knockdown and wild-type, aged 8-10 weeks.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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