Baicalin inhibits pressure overload-induced cardiac hypertrophy by regulating the SIRT3-dependent signaling pathway

Mechanisms underlying altered ubiquitin-proteasome system activity during heart failure and pharmacological interventions

Heart failure (HF) is a refractory disease with a global prevalence that is continuously increasing. The mechanisms underlying the pathogenesis of HF are multi-faceted, intricate, and not yet fully elucidated. Appropriate levels of protein turnover are essential for maintaining cardiac homeostasis and, accordingly, compromised protein degradation systems can significantly contribute to heart disease. The ubiquitin-proteasome system (UPS) modulates the structure and function of cardiac cells by facilitating the degradation of signaling and structural proteins. Research in the preceding decade has focused on elucidating the role of the UPS in the context of cardiovascular physiology and pathophysiology. A comprehensive understanding of the UPS status and the underlying mechanisms contributing to its potential dysregulation in HF is imperative for developing targeted therapeutic interventions. Previous research has identified several novel interventions involving components of the UPS and several have been adapted for HF therapy. In this review, we summarize the mechanisms underlying altered UPS activity in HF and provide an outline of UPS regulators that affect the progression of HF. Additionally, the potential for small molecules to intervene in UPS function in HF is discussed.

Prophylactic administration of Kanli granule maintains fatty acid oxidation in the myocardium to prevent heart failure via activating AMPK/PPARα/CPT1A pathway: A network pharmacology-based study

BACKGROUND

Abnormal energy metabolism plays a crucial role in the pathogenesis of heart failure (HF). Kanli granule (KLG), as an effective herbal medicine for treating HF, has been used in clinical practice for nearly 30 years. However, its underlying mechanisms have not been fully elucidated.

METHODS

This study combined network pharmacology, molecular docking, and in vivo experiments to explore KLG's effect on HF. Wistar rats with AAC-induced HF were orally administered KLG (0.675/1.35/2.7 g/kg) for 32 weeks. Assessments included heart weight index, echocardiography, histopathology, fatty acid metabolism (FAM) targets, and myocardial energy metrics. We focused on fatty acid oxidation (FAO) pathway, measuring AMPK, PPARα, and CPT1A at protein and gene levels.

RESULTS

KLG maintained cardiac function in AAC rats. Network pharmacology identified PPAR and AMPK pathways as key in FAM. Molecular docking showed strong affinity of KLG components to FAO targets PPARα and CPT1A. KLG significantly enhanced myocardial energy metabolism, reduced myocardial FFA levels, and increased ATP/ADP ratios. It activated AMPK and upregulated FAO-related genes, including PPARα and CPT1A.

CONCLUSION

KLG improves FAO in AAC-induced HF rats by activating the AMPK/PPARα/CPT1A pathway, reducing myocardial FFA levels, and improving myocardial microstructure and cardiac function.

Recent Advances in the Therapeutic Effects and Molecular Mechanisms of Baicalin

Baicalin, a kind of polyphenolic flavonoid, is a major bioactive flavone derived from the root of Scutellaria baicalensis, which has been widely utilized in clinical practice in China for thousands of years. In recent years, it has attracted increasing attention due to its potential therapeutic properties observed in preclinical studies involving various disease models. However, the precise mechanisms underlying its biological activities have not been fully elucidated. This review summarizes recent research progress on the molecular mechanisms through which baicalin exerts its effects, particularly in tumor suppression, cardiovascular protection, neuronal preservation, and glucose and lipid metabolism regulation in murine models. Additionally, we discuss the delivery methods of baicalin and its transformation by intestinal microbiota.

Roles of Sirtuins in Cardiovascular Diseases: Mechanisms and Therapeutics

Cardiovascular diseases (CVDs) are experiencing a rapid surge and are widely recognized as the leading cause of mortality in the current aging society. Given the multifactorial etiology of CVDs, understanding the intricate molecular and cellular mechanisms is imperative. Over the past 2 decades, many scientists have focused on Sirtuins, a family of nicotinamide adenine dinucleotide-dependent deacylases. Sirtuins are highly conserved across species, from yeasts to primates, and play a crucial role in linking aging and diseases. Sirtuins participate in nearly all key physiological and pathological processes, ranging from embryogenic development to stress response and aging. Abnormal expression and activity of Sirtuins exist in many aging-related diseases, while their activation has shown efficacy in mitigating these diseases (eg, CVDs). In terms of research, this field has maintained fast, sustained growth in recent years, from fundamental studies to clinical trials. In this review, we present a comprehensive, up-to-date discussion on the biological functions of Sirtuins and their roles in regulating cardiovascular biology and CVDs. Furthermore, we highlight the latest advancements in utilizing Sirtuin-activating compounds and nicotinamide adenine dinucleotide boosters as potential pharmacological targets for preventing and treating CVDs. The key unresolved issues in the field-from the chemicobiological regulation of Sirtuins to Sirtuin-targeted CVD investigations-are also discussed. This timely review could be critical in understanding the updated knowledge of Sirtuin biology in CVDs and facilitating the clinical accessibility of Sirtuin-targeting interventions.

Baicalin Mitigates Cardiac Hypertrophy and Fibrosis by Inhibiting the p85a Subunit of PI3K

Background: Heart failure (HF) is a serious public health concern. Baicalin is one of the major active ingredients of a traditional Chinese herbal medicine, Huang Qin, which is used to treat patients with chest pain or cardiac discomfort. However, the underlying mechanism(s) of the cardioprotective effect of baicalin are still not fully understood. Methods: Isoprenaline injection or transverse aortic constriction-induced animal models and isoprenaline or angiotensin 2 administration-induced cell models of heart failure were established. Baicalin (15 mg/kg/day or 25 mg/kg/day) was administered in vivo, and 10 μM baicalin was administered in vitro. Potential pharmacological targets of baicalin and genes related to heart failure were identified via different databases, which suggested that PI3K-Akt may be involved in the effects of baicalin. Molecular docking was carried out to reveal the effect of baicalin on p85a. Results: We observed significant antihypertrophic and antifibrotic effects of baicalin both in vivo and in vitro. The mean cross-sectional area of cardiomyocytes recovered from 390 μm2 in the HF group to 195 μm2 in the baicalin-treated group. The area of fibrosis was reduced from 2.8-fold in the HF group to 1.62-fold in the baicalin-treated group. Baicalin displayed a significant cardioprotective effect via the inhibition of the PI3K signaling pathway by binding with five amino acid residues of the p85a regulatory subunit of PI3K. The combination treatment of baicalin and an inhibitor of PI3K p110 demonstrated a stronger cardioprotective effect. The mean ejection fraction increased from 54% in the baicalin-treated group to 67% in the combination treatment group. Conclusions: Our work identified baicalin as a new active herbal ingredient that is able to treat isoprenaline-induced heart dysfunction and suggests that p85a is a pharmacological target. These findings reveal the significant potential of baicalin combined with an inhibitor of PI3K p110 for the treatment of heart failure and support more clinical trials in the future.

Exploring the Cardiovascular Protective Effects of Baicalin: A Pathway to New Therapeutic Insights

Cardiovascular disorders develop the highest rates of mortality and morbidity worldwide, emphasizing the need for novel pharmacotherapies. The Chinese medicinal plant S. baicalensis has a number of major active components, one of which is called baicalin. According to emerging research, baicalin reduces chronic inflammation, immunological imbalance, lipid metabolism, apoptosis, and oxidative stress. Baicalin improves endothelial function and protects the cardiovascular system from oxidative stress-induced cell injury by scavenging free radicals and inhibiting xanthine oxidase. Therefore, it helps prevent CVD such as hypertension, atherosclerosis, and cardiac arrest. In this review, the therapeutic effects of baicalein are discussed in relation to both the prevention and management of cardiovascular diseases.

Regulatory Role of Flavonoid Baicalin from Scutellaria baicalensis on AMPK: A Review

AMP-activated protein kinase (AMPK) is a ubiquitous sensor of cellular energy and nutrient status in eukaryotic cells. It serves an essential function in the modulation of energy balance and metabolism homeostasis through its regulation of carbohydrate metabolism, lipid metabolism and protein metabolism. The dysregulation of AMPK is closely related to a series of systemic diseases, affecting multiple organs and tissues. Baicalin is a natural compound derived from the dry raw root of Scutellaria baicalensis, and it has been found to exhibit several potential pharmacological actions. These include hepatoprotective effects, anti-inflammation effects and anti-tumor effects. These biological activities are related to the regulatory effect of baicalin on the host metabolism, which is closely associated with AMPK modulation. In this review, we provide an overview of the regulatory effect of baicalin on AMPK and its upstream and downstream signaling pathways. The pharmacological properties and underlying mechanism of baicalin for regulating AMPK were summarized with regards to four aspects: regulatory effect of baicalin on AMPK in lipid metabolism and glucose metabolism, regulatory effect of baicalin on AMPK in its pharmacological effect of anti-tumor and anti-inflammation. As a natural compound, baicalin has the potential for the management of certain AMPK-related diseases.

Reactive oxygen species sensitive nanomicelles promote the antifungal activity of ketoconazole against Candida albicans in vulvovaginal candidiasis

Excessive local accumulation of reactive oxygen species (ROS) in vulvovaginal candidiasis (VVC) leads to oxidative stress and aggravates inflammation. This study aimed to optimize and synthesize four ROS-sensitive polyethylene glycol (PEG)-boride polymers (PB, PCB, BPB, and BCPCB). A nanomicelle (BCPCB-K) was constructed using BCPCB-encapsulated ketoconazole (KTZ). Finally, the depolymerization principle and ROS-sensitive drug release of BCPCB-K as well as its anti-Candida albicans (CA) and therapeutic effects on mice with VVC were explored through in vitro and in vivo experiments. BCPCB-K exhibited low toxicity to mammalian cells in vitro and good biocompatibility in vivo. It also improved the dispersion and solubility of the hydrophobic drug KTZ. Furthermore, BCPCB-K simultaneously scavenged ROS and released the drug, thus facilitating the antifungal and VVC-treating effects of KTZ. Overall, the findings of this study broadened the application of ROS-sensitive materials in the drug-loading and antifungal fields and provided a strategy for VVC treatment.

Immuno-modulatory role of baicalin in atherosclerosis prevention and treatment: current scenario and future directions

Atherosclerosis (AS) is recognized as a chronic inflammatory condition characterized by the accumulation of lipids and inflammatory cells within the damaged walls of arterial vessels. It is a significant independent risk factor for ischemic cardiovascular disease, ischemic stroke, and peripheral arterial disease. Despite the availability of current treatments such as statins, proprotein convertase subtilisin/kexin type 9 (PCSK9) inhibitors, and lifestyle modifications for prevention, AS remains a leading cause of morbidity and economic burden worldwide. Thus, there is a pressing need for the development of new supplementary and alternative therapies or medications. Huangqin (Scutellaria baicalensis Georgi. [SBG]), a traditional Chinese medicine, exerts a significant immunomodulatory effect in AS prevention and treatment, with baicalin being identified as one of the primary active ingredients of traditional Chinese medicine. Baicalin offers a broad spectrum of pharmacological activities, including the regulation of immune balance, antioxidant and anti-inflammatory effects, and improvement of lipid metabolism dysregulation. Consequently, it exerts beneficial effects in both AS onset and progression. This review provides an overview of the immunomodulatory properties and mechanisms by which baicalin aids in AS prevention and treatment, highlighting its potential as a clinical translational therapy.

Unraveling spatial metabolome of the aerial and underground parts of Scutellaria baicalensis by matrix-assisted laser desorption/ionization mass spectrometry imaging

BACKGROUND

Scutellaria baicalensis Georgi, a traditional Chinese medicine, is clinically applied mainly as the dried root of Scutellaria baicalensis, and the aerial parts of Scutellaria baicalensis, its stems and leaves, are often consumed as "Scutellaria baicalensis tea" to clear heat, dry dampness, reduce fire and detoxify, while few comparative analyses of the spatial metabolome of the aerial and underground parts of Scutellaria baicalensis have been carried out in current research.

METHODS

In this work, Matrix-assisted laser desorption ionization-mass spectrometry imaging (MALDI-MSI) was used to visualize the spatial imaging of the root, stem, and leaf of Scutellaria baicalensis at a high resolution of 10 μm, respectively, investigating the spatial distribution of the different secondary metabolites in the aerial and underground parts of Scutellaria baicalensis.

RESULTS

In the present results, various metabolites, such as flavonoid glycosides, flavonoid metabolites, and phenolic acids, were systematically characterized in Scutellaria baicalensis root, stem, and leaf. Nine glycosides, 18 flavonoids, one organic acid, and four other metabolites in Scutellaria baicalensis root; nine glycosides, nine flavonoids, one organic acid in Scutellaria baicalensis stem; and seven flavonoids and seven glycosides in Scutellaria baicalensis leaf were visualized by MALDI-MSI. In the underground part of Scutellaria baicalensis, baicalein, wogonin, baicalin, wogonoside, and chrysin were widely distributed, while there was less spatial location in the aerial parts. Moreover, scutellarein, carthamidin/isocarthamidin, scutellarin, carthamidin/isocarthamidin-7-O-glucuronide had a high distribution in the aerial parts of Scutellaria baicalensis. In addition, the biosynthetic pathways involved in the biosynthesis of significant flavonoid metabolites in aerial and underground parts of Scutellaria baicalensis were successfully localized and visualized.

CONCLUSIONS

MALDI-MSI offers a favorable approach for investigating the spatial distribution and effective utilization of metabolites of Scutellaria baicalensis. The detailed spatial chemical information can not only improve our understanding of the biosynthesis pathways of flavonoid metabolites, but more importantly, suggest that we need to fully exert the overall medicinal value of Scutellaria baicalensis, strengthening the reuse and development of the resources of Scutellaria baicalensis aboveground parts.

Tetrahydrocurcumin ameliorates postinfarction cardiac dysfunction and remodeling by inhibiting oxidative stress and preserving mitochondrial function via SIRT3 signaling pathway

BACKGROUND

Myocardial infarction (MI) often leads to sudden cardiac death. Persistent myocardial ischemia increases oxidative stress and impairs mitochondrial function, contributing significantly to postinfarction cardiac dysfunction and remodeling, and the subsequent progression to heart failure (HF). Tetrahydrocurcumin (THC), isolated from the rhizome of turmeric, has antioxidant properties and has been shown to protect against cardiovascular diseases. However, its effects on HF after MI are poorly understood.

PURPOSE

The objective was the investigation of the pharmacological effects of THC and its associated mechanisms in the pathogenesis of HF after MI.

METHODS

A total of 120 mice (C57BL/6, male) were used for the in vivo experiments. An MI mouse model was created by permanent ligation of the left anterior descending coronary artery. The mice received oral dose of THC at 120 mg/kg/d and the effects on MI-induced myocardial injury were evaluated by assessment of cardiac function, histopathology, myocardial oxidative levels, and mitochondrial function. Molecular mechanisms were investigated by intraperitoneal injection of 50 mg/kg of the SIRT3 selective inhibitor 3-TYP. Meanwhile, mouse neonatal cardiomyocytes were isolated and cultured in a hypoxic incubator to verify the effects of THC in vitro. Lastly, SIRT3 and Nrf2 were silenced using siRNAs to further explore the regulatory mechanism of key molecules in this process.

RESULTS

The mouse hearts showed significant impairment in systolic function after MI, together with enlarged infarct size, increased myocardial fibrosis, cardiac hypertrophy, and apoptosis of cardiomyocytes. A significant reversal of these changes was seen after treatment with THC. Moreover, THC markedly reduced reactive oxygen species generation and protected mitochondrial function, thus mitigating oxidative stress in the post-MI myocardium. Mechanistically, THC counteracted reduced Nrf2 nuclear accumulation and SIRT3 signaling in the MI mice while inhibition of Nrf2 or SIRT3 reversed the effects of THC. Cell experiments showed that Nrf2 silencing markedly reduced SIRT3 levels and deacetylation activity while inhibition of SIRT3 signaling had little impact on Nrf2 expression.

CONCLUSION

This is the first demonstration that THC protects against the effects of MI. THC reduced both oxidative stress and mitochondrial damage by regulating Nrf2-SIRT3 signaling. The results suggest the potential of THC in treating myocardial ischemic diseases.

Natural compounds targeting mitochondrial dysfunction: emerging therapeutics for target organ damage in hypertension

Hypertension generally causes target organ damage (TOD) in the heart, brain, kidney, and blood vessels. This can result in atherosclerosis, plaque formation, cardiovascular and cerebrovascular events, and renal failure. Recent studies have indicated that mitochondrial dysfunction is crucial in hypertensive target organ damage. Consequently, mitochondria-targeted therapies attract increasing attention. Natural compounds are valuable resources for drug discovery and development. Many studies have demonstrated that natural compounds can ameliorate mitochondrial dysfunction in hypertensive target organ damage. This review examines the contribution of mitochondrial dysfunction to the development of target organ damage in hypertension. Moreover, it summarizes therapeutic strategies based on natural compounds that target mitochondrial dysfunction, which may be beneficial for preventing and treating hypertensive target organ damage.