Kaempferol Regulates miR-15b/Bcl-2/TLR4 to Alleviate OGD-Induced Injury in H9c2 Cells

Area of Science:

• Cardiovascular Biology
• Molecular Medicine
• Pharmacology

Background:

• Ischemic heart disease (IHD) is a major global health concern.
• Kaempferol (Kae), a natural flavonoid, exhibits anti-inflammatory and antioxidant properties.
• These properties suggest a potential protective role for Kae in IHD.

Purpose of the Study:

• To investigate the protective mechanisms of Kaempferol (Kae) against oxygen-glucose deprivation (OGD)-induced injury in cardiomyocytes.
• To elucidate the role of miR-15b and its downstream signaling pathways in Kae's cardioprotective effects.

Main Methods:

• Primary cardiomyocytes and H9c2 cells were subjected to OGD and treated with Kae.
• Cell viability and apoptosis were assessed using CCK-8 assay and flow cytometry.
• Quantitative RT-PCR, western blot, and dual-luciferase assays were employed to analyze miR-15b, TLR4, Bcl-2, and signaling pathway activation (PI3K/AKT, Wnt/β-catenin).

Main Results:

• OGD induced significant cell damage, apoptosis, and increased expression of apoptosis-associated proteins.
• Kae treatment attenuated OGD-induced cell injury and apoptosis.
• Kae promoted the down-regulation of miR-15b, which targets Bcl-2 and TLR4, and activated PI3K/AKT and Wnt/β-catenin pathways. MiR-15b mimic reversed these effects.

Conclusions:

• Kaempferol (Kae) demonstrates significant cardioprotective effects against OGD-induced damage.
• Kae exerts its protective effects by down-regulating miR-15b expression.
• Activation of PI3K/AKT and Wnt/β-catenin pathways mediates the beneficial actions of Kae in IHD models.