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Updated: Feb 7, 2026
Whole Mount Immunohistochemistry in Zebrafish Embryos and Larvae
Published on: January 29, 2020
Gallic Acid Protects Against LPS-Induced Cardiac Dysfunction by Modulating Inflammatory Responses and Notch Signaling
Modi Kiran Piyushbhai1, Ambika Binesh1, Kaliyamurthi Venkatachalam1
1Institute of Fisheries Post Graduate Studies, Tamil Nadu Dr. J. Jayalalithaa Fisheries University (TNJFU), OMR Campus, Vaniyanchavadi, Chennai, India.
Insights
Gallic acid (GA) protects zebrafish hearts from damage caused by Lipopolysaccharide (LPS) by inhibiting the Notch signaling pathway. This natural compound offers cardiovascular benefits by reducing inflammation and improving heart function.
Area of Science:
- Cardiovascular Research
- Molecular Biology
- Pharmacology
Background:
- Cardiovascular diseases pose a significant global health threat, necessitating research into effective preventive agents.
- Gallic acid (GA), a natural polyphenol, exhibits potential cardioprotective properties, but its underlying mechanisms remain unclear.
- The Notch signaling pathway plays a critical role in cardiac injury and repair processes.
Purpose of the Study:
- To investigate the cardioprotective effects of Gallic acid (GA) in a Lipopolysaccharide (LPS)-induced zebrafish embryo larvae (ZFEL) model.
- To elucidate the role of the Notch signaling pathway in mediating GA's cardioprotective activity.
Main Methods:
- An in vivo cardiac injury model was established in ZFEL using LPS induction.
- Cardioprotective efficacy of GA was assessed through survival analysis, morphological evaluation, heart rate monitoring, cell death assays, and nitric oxide determination.
- Expression levels of Notch signaling components (Notch1, Delta1, Hey1, Hes1) and cardiac biomarkers (MPO, MMP-9, MMP-13, NO) were analyzed using immunoblotting and immunohistochemistry.
Main Results:
- Gallic acid significantly improved survival rates, normalized heart morphology and rate, reduced cell death, and inhibited nitric oxide generation in LPS-treated ZFEL.
- GA treatment suppressed the activation of the Notch signaling pathway, including key proteins like Notch1, Delta1, Hey1, and Hes1.
- Expression of cardiac damage markers, including myeloperoxidase (MPO), matrix metalloproteinase-9 (MMP-9), matrix metalloproteinase-13 (MMP-13), and nitric oxide (NO), was downregulated by GA.
Conclusions:
- Gallic acid demonstrates significant cardioprotective effects against LPS-induced cardiac injury in zebrafish embryos.
- The cardioprotective mechanism of GA involves the suppression of the Notch signaling pathway.
- These findings highlight GA as a potential therapeutic agent for cardiovascular protection, mediated through modulation of Notch signaling.
Abstract:
Cardiovascular diseases are a threat to human health and are associated with increased mortality. Gallic acid (GA) (3,4,5-trihydroxybenzoic acid) is a naturally occurring polyphenolic compound with cardiovascular preventive properties. However, the precise mechanism underlying its cardioprotective effect is not fully understood. The Notch signaling system is essential in heart injury/repair mechanisms, and clarifying this mechanism in a Lipopolysaccharide (LPS) stimulated zebrafish embryo larvae (ZFEL) model for cardioprotective function. This study aimed to elucidate the cardioprotective activity of GA in LPS stimulated ZFEL via Notch signaling pathway. In this study, an in vivo cardiac injury model was developed in ZFEL using LPS induction. The GA cardioprotective property was investigated by LC50, survival analysis, morphological assessment, heart rate assessment, cell death, and nitric oxide determination. Expression of Notch signaling and the cardiac biomarker protein were done by immunoblotting and in addition whole mount immunohistochemistry was performed for NICD, MMP 9, and MMP 13. GA protects LPS-induced ZFEL by increasing survival rates, normalizing morphological anomalies, restoring abnormal heart rate, preventing cell death, and inhibiting NO generation. It suppressed the Notch signaling pathway (Notch1, Delta1, Hey1, and Hes1) and cardiac biomarker proteins (MPO, MMP-9, MMP-13, and NO) in LPS-stimulated ZFEL, indicating cardioprotective property. Our findings showed that GA suppressed both molecular and cellular events during LPS-induced heart damage via the Notch signaling pathway.
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