Baicalein Protects H9c2 Cardiomyoblasts Against LPS-Induced Inflammatory Injury by Modulating the NF-κB/NLRP3 Inflammasome Pathway and Mitochondrial ROS
| Author | Yi Lu | en |
| Author | Zahra Zahid Piracha | en |
| Author | Umar Saeed | en |
| Author | Fangjun Luo | en |
| Accessioned Date | 2026-04-30T01:31:03Z | |
| Issued Date | 2026-12-31 | en |
| Abstract | Background: Sepsis-related cardiomyopathy is mainly induced by uncontrolled inflammation and mitochondrial oxidative damage triggered by endotoxins, especially those of Gram-negative bacteria. Lipopolysaccharide (LPS), an endotoxin, activates the Toll-like receptor 4/nuclear factor kappa B (TLR4/NF-κB) signaling pathway and the NOD-like receptor family pyrin domain containing 3 (NLRP3) inflammasome, which further activates caspase-1 to process the pro-inflammatory cytokines interleukin-1β (IL-1β) and interleukin-18 (IL-18). Chronic activation of this signaling pathway is responsible for mitochondrial damage and loss of membrane potential. Baicalein, a flavonoid derived from the herbal plant Scutellaria baicalensis is well recognized for its anti-inflammatory and antioxidant properties, although its full modulation of the NF-κB/NLRP3 mitochondrial signaling pathway is not thoroughly understood. Objectives: In this study, we assessed whether baicalein has a protective effect on H9c2 cardiomyoblasts against inflammatory and mitochondrial injury induced by LPS through regulation of inflammatory pathways involving NF-κB, the inflammasome, caspase-1 activity, cytokine expression, and oxidation. Methods: H9c2 cells were pre-exposed to different baicalein concentrations (5 - 20 µM) and, after 1 hour, exposed to 1 µg/mL of LPS. Analysis included cell viability measurements by MTT assay, lactate dehydrogenase (LDH) release, and microscopic evaluation by phase-contrast microscopy. Expression levels of premature Nlrp3, Il1B, Il18, and Casp1 (0 - 4 h) were analyzed by real-time polymerase chain reaction (PCR). Protein levels of inflammasome and NF-κB pathway proteins were evaluated by immunoblot analysis. Activity of caspase-1 and cytokine secretion of IL-1β and IL-18 were evaluated by colorimetry and enzyme-linked immunosorbent assay (ELISA), respectively. Mitochondrial membrane potential (ΔΨm) was evaluated by staining with JC1 dye, and reactive oxygen species (ROS) levels were evaluated by fluorescence with DCFH2DA; N-acetylcysteine (NAC) was used as an antioxidant positive control. Results: LPS strongly elevated the transcription of Nlrp3 and Il1b at 2 hours, in addition to enhancing protein expression of NLRP3, activity of caspase-1, and secretion of IL-1β and IL-18. Underlying these pro-inflammatory responses were mitochondrial depolarization, augmented ROS production, diminished cell survival, and cytotoxicity. Prior administration of baicalein mitigated NF-κB activation, diminished priming of the inflammasome response at both transcriptional and protein levels, and decreased caspase-1 activity and secretion of the cytokines. Moreover, baicalein maintained mitochondrial membrane potential and diminished ROS within the cells, comparable to NAC, and improved cellular viability and morphology Conclusions: Baicalein confers substantial protection against LPS-induced inflammatory and oxidative damage in H9c2 cardiomyoblasts by concurrently suppressing NF-κB activation, mitigating NLRP3 inflammasome signaling, curbing caspase-1–driven cytokine maturation, and stabilizing mitochondrial function through reduction of ROS. These findings identify baicalein as a promising candidate for targeting the ROS-inflammasome axis in sepsis-associated cardiac dysfunction and related inflammatory cardiac disorders. | en |
| DOI | https://doi.org/10.5812/ijpr-169689 | en |
| URI | https://repository.brieflands.com/handle/123456789/67085 | |
| Keyword | Baicalein | en |
| Keyword | Lipopolysaccharide | en |
| Keyword | H9c2 Cardiomyoblasts | en |
| Keyword | NF-κB Signaling | en |
| Keyword | NLRP3 Inflammasome | en |
| Keyword | Caspase-1 | en |
| Keyword | IL-1β | en |
| Keyword | IL-18 | en |
| Keyword | Oxidative Stress | en |
| Keyword | Mitochondrial Membrane Potential | en |
| Keyword | Reactive Oxygen Species | en |
| Keyword | Sepsis-associated Cardiomyopathy | en |
| Keyword | Cardiomyocyte Inflammation | en |
| Keyword | Antioxidant Therapy | en |
| Publisher | Brieflands | en |
| Title | Baicalein Protects H9c2 Cardiomyoblasts Against LPS-Induced Inflammatory Injury by Modulating the NF-κB/NLRP3 Inflammasome Pathway and Mitochondrial ROS | en |
| Type | Research Article | en |