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Andrographolide Mitigates DOCA-Salt-Induced Cardiac Hypertrophy by Regulating Calcium-Handling Genes
Muhamad Rizqy Fadhillah1,2,3, Wawaimuli Arozal2, Raymond Rubianto Tjandrawinata4
1Doctoral Program in Biomedical Science, Universitas Indonesia, Central Jakarta, Java, Indonesia.
Insights
Andrographolide treatment reduced cardiac hypertrophy in a rat model of hypertension. This natural compound helped restore normal calcium handling and reduce key markers of heart disease.
Area of Science:
- Cardiovascular Research
- Pharmacology
- Molecular Biology
Background:
- Cardiac hypertrophy is a detrimental response to chronic hypertension, often linked to calcium handling dysregulation.
- Andrographolide, a plant-derived compound, shows promise for heart protection, but its effect on pressure-overload hypertrophy is not well understood.
- This study investigates andrographolide's impact on hypertension-induced cardiac hypertrophy and associated molecular changes.
Purpose of the Study:
- To evaluate the efficacy of andrographolide in mitigating cardiac hypertrophy induced by deoxycorticosterone acetate (DOCA)-salt treatment in rats.
- To assess andrographolide's influence on calcium-handling gene expression, specifically SERCA2a and RyR.
- To determine the effect of andrographolide on plasma B-type natriuretic peptide (BNP) levels as a biomarker for cardiac strain.
Main Methods:
- A deoxycorticosterone acetate (DOCA)-salt rat model was established to induce hypertension and cardiac hypertrophy.
- Rats were treated with andrographolide or a vehicle control after developing hypertension.
- Cardiac function, blood pressure, plasma BNP, cardiac calcium levels, and SERCA2a/RyR mRNA expression were assessed.
Main Results:
- DOCA-salt treatment led to significant increases in blood pressure, left ventricular hypertrophy, plasma BNP, and cardiac calcium levels.
- Andrographolide administration effectively attenuated these hypertension-induced detrimental effects.
- Andrographolide treatment restored the expression of SERCA2a and RyR, key calcium-handling proteins.
Conclusions:
- Andrographolide demonstrates a significant therapeutic effect against DOCA-salt-induced cardiac hypertrophy in rats.
- The cardioprotective mechanism of andrographolide appears to involve the restoration of calcium-handling pathways.
- These findings suggest andrographolide holds potential for treating hypertension-related cardiac remodeling.
Background And Objectives:
Cardiac hypertrophy is a maladaptive response to chronic hypertension and is often associated with impaired calcium handling. Andrographolide, a bioactive diterpenoid, has shown cardioprotective effects in several preclinical models, but its role in pressure-overload-induced hypertrophy remains unclear. This study evaluated the effects of andrographolide on cardiac hypertrophy, calcium-handling gene expression, and plasma B-type natriuretic peptide (BNP) levels in a deoxycorticosterone acetate (DOCA)-salt rat model of hypertension.
Materials And Methods:
Fifteen male Sprague-Dawley rats underwent unilateral nephrectomy followed one week later by DOCA administration (20 mg/kg, subcutaneous, twice weekly) and 1% NaCl drinking water. After two weeks of DOCA-salt exposure, rats were randomized to receive oral andrographolide (30 mg/kg/day in 0.5% carboxymethyl cellulose) or no treatment. Blood pressure was measured at weeks 2 and 5 using a tail-cuff system. At week 5, echocardiography was performed, followed by euthanasia and collection of cardiac tissue and plasma. BNP and cardiac calcium levels were measured by enzyme-linked immunosorbent assay and colorimetric assay, respectively. Sarco/endoplasmic reticulum Ca2+-ATPase 2a (SERCA2a) and ryanodine receptor (RyR) mRNA expression were quantified by PCR using β-actin as the reference gene.
Results:
DOCA-salt treatment significantly increased blood pressure, left ventricular hypertrophy indices, plasma BNP, and cardiac calcium levels. Andrographolide attenuated these changes and restored SERCA2a and RyR expression.
Conclusion:
Andrographolide alleviates DOCA-salt-induced cardiac hypertrophy, likely by restoring calcium-handling pathways, supporting its therapeutic potential in hypertension-induced cardiac remodeling.
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