4-Chlorochalcone is a selective MAO-B inhibitor
**Background**
Monoamine oxidase (MAO) enzymes, specifically MAO-A and MAO-B, play a critical role in the oxidative deamination of various biogenic amines in the brain and peripheral tissues. MAO-B is primarily associated with the breakdown of dopamine and is frequently targeted in the research of neurodegenerative disorders, such as Parkinson’s disease, where the preservation of dopaminergic neurons is essential. Additionally, the inhibition of acetylcholinesterase (AChE) is a well-established strategy for improving cognitive function in Alzheimer’s disease. Developing compounds that can selectively inhibit MAO-B over MAO-A, or provide dual inhibition of MAO-B and AChE, represents a promising therapeutic approach for treating complex neurological conditions. In this context, we will introduce a chalcone derivative – 4-Chlorochalcone.
**Definition**
4-Chlorochalcone is a chalcone derivative that acts as a potent and selective inhibitor of human monoamine oxidase-B (hMAO-B) with an IC50 value of 0.082 μM.
**In Vitro Studies**
Regarding the 4-Chlorochalcone biological activity, this compound demonstrates high selectivity for the B-isoform of monoamine oxidase. In vitro assays indicate that while it strongly inhibits hMAO-B (IC50 = 0.082 μM), it exhibits significantly lower potency against hMAO-A, with an IC50 value of 9.95 μM. Beyond its MAO inhibitory effects, 4-Chlorochalcone in vitro studies have revealed that the compound also possesses inhibitory activity against cholinesterase, specifically inhibiting AChE with an IC50 of 2.79 μM. Based on the 4-Chlorochalcone technical information, the compound has a molecular weight of 242.70 and a chemical formula of C15H11ClO. In conclusion, 4-Chlorochalcone is a selective MAO-B inhibitor that also exhibits inhibitory activity against AChE, making it a valuable tool for neuroscience research.
Keywords
4-Chlorochalcone, 956-04-7, Monoamine Oxidase, Cholinesterase (ChE), MAO, Inhibitor, inhibitor, inhibit
References
**Background**
Oxidative stress, inflammation, and viral infections are central drivers in the progression of various chronic diseases, including cancer and HIV-1. The accumulation of reactive oxygen species (ROS) can lead to lipid peroxidation and DNA damage, while the infiltration of regulatory T (Treg) cells into the tumor microenvironment often suppresses the immune response, facilitating tumor growth. Consequently, identifying natural compounds with multi-target activities—such as antioxidant, anti-inflammatory, and antitumor properties—is of significant research interest. In this context, we will introduce a plant phenolic with diverse biological activities – Methyl gallate.
**Definition**
Methyl gallate is a polyphenol derived from plants that exhibits potent antioxidant, anticancer, and anti-inflammatory activities, as well as inhibitory effects against HIV-1 and various bacterial strains.
**In Vitro Studies**
According to the Methyl gallate description, this compound demonstrates broad-spectrum biological activity across various models. In antibacterial assays, Methyl gallate in vitro showed that the growth of A. viscosus was completely inhibited at a low dose (MIC = 1 mg/mL), while S. mutans and S. sobrinus exhibited intermediate sensitivity (MIC = 2-4 mg/mL), and Lactobacillus spp. were inhibited at 8 mg/mL. Regarding its antioxidant capacity, a concentration of 100 mM of Methyl gallate could alleviate lipid peroxidation and prevent the depletion of intracellular glutathione (GSH) in cells exposed to 8.0 mM $\text{H}_2\text{O}_2$ for 3 hours.
Furthermore, Methyl gallate exhibits significant effects in cancer and immunology research. It inhibits the suppressive effects of Treg cells on effector $\text{CD4}^+$ T cells and reduces Treg migration toward the tumor environment, while significantly decreasing the expression of forkhead box P3 (Foxp3). In terms of cytotoxicity and inflammation, Methyl gallate showed an $\text{IC}_{50}$ of 267.2 $\mu\text{M}$ against human HeLa cells. In mouse RAW264.7 cells, it inhibited LPS-induced nitric oxide production ($\text{IC}_{50} = 11.1\ \mu\text{M}$) and TNF-alpha secretion ($\text{IC}_{50} = 29.4\ \mu\text{M}$). Additionally, it displays anticomplement activity in sheep erythrocytes ($\text{IC}_{50} = 0.84\ \text{mM}$) and rabbit erythrocytes ($\text{IC}_{50} = 1.07\ \text{mM}$). For researchers seeking Methyl gallate technical information, these results highlight its potential as a multi-functional therapeutic agent. In conclusion, Methyl gallate is a versatile plant phenolic with potent antioxidant, anti-inflammatory, and antitumor properties.
Keywords
Methyl gallate, 99-24-1, Gallincin, NSC 363001, NSC363001, NSC-363001, Bacterial, HIV, Reactive Oxygen Species (ROS), Human immunodeficiency virus, Inhibitor, inhibitor, inhibit
References
[1] Kang MS, et al. Inhibitory effect of methyl gallate and gallic acid on oral bacteria. J Microbiol. 2008 Dec;46(6):744-50.
[2] Hsieh TJ, et al. Protective effect of methyl gallate from Toona sinensis (Meliaceae) against hydrogen peroxide-induced oxidative stress and DNA damage in MDCK cells. Food Chem Toxicol. 2004 May;42(5):843-50.
[3] Lee H, et al. Methyl gallate exhibits potent antitumor activities by inhibiting tumor infiltration of CD4+CD25+ regulatory T cells. J Immunol. 2010 Dec 1;185(11):6698-705.
[4] Wang CR, et al. First report on isolation of methyl gallate with antioxidant, anti-HIV-1 and HIV-1 enzyme inhibitory activities from a mushroom (Pholiota adiposa). Environ Toxicol Pharmacol. 2014 Mar;37(2):626-37.
**Background**
Hypoxia-inducible factor 1 (HIF-1) plays a critical role in the adaptation of cells to low oxygen environments, which is a hallmark of many solid tumors. HIF-1 consists of α and β subunits that dimerize to regulate the expression of genes involved in angiogenesis, metabolism, and cell survival. Furthermore, the interaction between monocarboxylate transporter 4 (MCT4) and Basigin is essential for lactate transport, supporting the metabolic demands of cancer cells under hypoxic conditions. In addition to oncology, the papain-like protease (PLpro) is a key enzyme for the replication of betacoronaviruses, including SARS-CoV-2. Targeting these pathways provides significant opportunities for treating malignancies and viral infections. In this context, we will introduce a versatile inhibitor – Acriflavine.
**Definition**
Acriflavine (Acriflavinium chloride) hydrochloride is a fluorescent acridine dye and antiseptic agent that acts as a potent HIF-1 inhibitor and PLpro inhibitor. According to the Acriflavine description, it prevents the dimerization of HIF-1α and HIF-1β subunits and inhibits the interaction between MCT4 and Basigin.
**In Vitro and In Vivo Studies**
The Acriflavine biological activity has been demonstrated across various models. Acriflavine in vitro studies show that it inhibits MCT4-Basigin dependent Rluc activity with an IC50 of 4.6 μM and the NhRL-MCT1/Basigin-ChRL interaction with an IC50 of ~19.5 μM. In HSR-GBM1 cells, treatment with 5 μM Acriflavine for 24 hours does not significantly affect hypoxia-induced lactate production, but concentrations of 1-25 μM for 72 hours reduce the clonogenic potential of neurosphere-derived cells, particularly under hypoxia. Regarding antiviral activity, Acriflavine (1-10 μM; 24 h) inhibits SARS-CoV-2 replication in Vero and A549ACE2+ cells; specifically, IC50 values were 64 nM for Vero and 86 nM for A549ACE2+ cells.
Acriflavine In Vivo data further support its efficacy in Acriflavine Cancer research. In NOG mice bearing HSR-GBM1-Luc xenografts, intraperitoneal injection of 8 mg/kg (once daily for 13 or 15 administrations) inhibited tumor growth and reduced microvessel density. In C57BL/6J-CD45.1 mice with BCR/abl-induced chronic myeloid leukemia, 8 mg/kg (i.p.; once daily for 10 days) reduced splenomegaly and the number of leukemia stem cells. Additionally, in K18-ACE2 transgenic mice infected with SARS-CoV-2, oral administration (100 mg/kg) or intramuscular injection (5-15 mg/kg) for 6 days blocked brain infection and reduced pulmonary viral load. In conclusion, Acriflavine is a potent multi-target inhibitor with significant potential in oncology and antiviral therapy.
Keywords
Acriflavine, 69235-50-3, Acriflavinium chloride, Fluorescent Dye, HIF/HIF Prolyl-Hydroxylase, Bacterial, SARS-CoV, Monocarboxylate Transporter, Fungal, Hypoxia-inducible factors, HIFs, HIF-PH, SARS coronavirus, DNA, RNA
References
[1] L M Chan, et al. Interaction of acriflavine with DNA and RNA. J Mol Biol. 1969 Mar 28;40(3):491-5.
[2] Tao Yin, et al. HIF-1 Dimerization Inhibitor Acriflavine Enhances Antitumor Activity of Sunitinib in Breast Cancer Model. Oncol Res. 2015; 22(3): 139-145.
[4] Voss DM, et al. Disruption of the monocarboxylate transporter-4-basigin interaction inhibits the hypoxic response, proliferation, and tumor progression. Sci Rep. 2017 Jun 27;7(1):4292.
[5] Cheloni G, et al. Targeting chronic myeloid leukemia stem cells with the hypoxia-inducible factor inhibitor acriflavine. Blood. 2017 Aug 3;130(5):655-665.
[6] Valeria Napolitano, et al. Acriflavine, a clinically aproved drug, inhibits SARS-CoV-2 and other betacoronaviruses. bioRxiv 2021.03.20.436259.
**Background**
Gastrointestinal cancers, including colorectal, pancreatic, prostate, and gastric cancers, remain significant global health challenges due to their high morbidity and the complexity of their therapeutic management. Beyond oncology, chronic inflammation and microbial infections often exacerbate tissue damage and contribute to disease progression. Research into naturally occurring compounds has revealed that certain monoterpenes possess multi-functional biological properties, including bactericidal, antifungal, and anti-inflammatory activities. Specifically, compounds derived from aromatic plants have shown promise in suppressing inflammatory mediators and inhibiting the proliferation of malignant cells. In this context, we will introduce a potent monoterpene with diverse therapeutic potential – Terpinen-4-ol.
**Definition**
Terpinen-4-ol (4-Carvomenthenol) is a naturally occurring monoterpene with the Terpinen-4-ol formula C10H18O and a molecular weight of 154.25. It is a potent bactericidal agent that also exhibits significant antifungal, anti-inflammatory, and antitumor properties.
**In Vitro Studies**
According to the Terpinen-4-ol description, this compound can be extracted from various aromatic plants, such as Melaleuca alternifolia (tea tree oil) and Camellia sinensis. Regarding Terpinen-4-ol biological activity, in vitro studies have demonstrated that Terpinen-4-ol (0.005%-0.1% (v/v), 72 h) exerts significant growth inhibition of colorectal, pancreatic, prostate, and gastric cancer cells in a dose-dependent manner. Furthermore, at a concentration of 0.01% (v/v) for 72 h, it enhances the cytotoxicity of combinations with various conventional chemotherapy approaches and biological treatment tools, suggesting its potential as a sensitizer in Terpinen-4-ol Cancer research. In cellular assays, Terpinen-4-ol demonstrated cytotoxicity against human HL-60 cells, with an IC50 value of 30 μM as assessed by MTT assay after 24 hours of treatment. Additionally, it has been shown to suppress the production of inflammatory mediators by activated human monocytes. In conclusion, Terpinen-4-ol is a versatile monoterpene that holds promise as a therapeutic agent for inflammation and human gastrointestinal cancers.
Keywords
Terpinen-4-ol, 562-74-3, 4-Carvomenthenol, Endogenous Metabolite, Bacterial, Fungal, tea-tree, oil, chemotherapeutic, Inhibitor, inhibitor, inhibit
References
[1] Hart PH, et al. Terpinen-4-ol, the main component of the essential oil of Melaleuca alternifolia (tea tree oil), suppresses inflammatory mediator production by activated human monocytes. Inflamm Res. 2000 Nov;49(11):619-26.
[2] Shapira S, et al. Terpinen-4-ol: A Novel and Promising Therapeutic Agent for Human Gastrointestinal Cancers. PLoS One. 2016 Jun 8;11(6):e0156540.
**Background**
Phosphatidylinositol 4-kinases (PI4Ks) play a critical role in the synthesis of phosphatidylinositol 4-phosphate (PI4P), a key phospholipid involved in various cellular processes, including vesicle trafficking and signal transduction. Among the PI4K family, PI4KIIIβ is particularly significant as it is often hijacked by various viruses to create replication organelles, which are essential for the viral life cycle. Consequently, the selective inhibition of PI4KIIIβ has emerged as a promising strategy for developing broad-spectrum antiviral therapies. By disrupting the formation of these replication complexes, researchers can effectively suppress viral proliferation. In this context, we will introduce a selective PI4KIIIβ inhibitor – MI 14.
**Definition**
MI 14 is a selective PI4KIIIβ inhibitor with an IC50 value of 54 nM. According to the MI 14 description, it exhibits high selectivity, with IC50 values exceeding 100 μM for both PI4KIIIα and PI4KIIα.
**In Vitro Studies**
The MI 14 biological activity has been extensively evaluated across multiple viral models and cell lines. In vitro studies conducted in HeLa cells demonstrated that MI 14 (compound 36t) possesses potent antiviral activity against several viruses. Specifically, it showed an EC50 of 0.087 µM against HCV 1b, 0.145 µM against CVB3, 1.03 µM against HRVM, and 10.6 µM against HVC 2a. Furthermore, MI 14 in vitro testing revealed that the compound does not inhibit phosphatidylinositol 3-kinases (including PI3Ka, PI3Kb, PI3Kd, and PI3Kg) with IC50 values up to 10 µM, highlighting its specificity for the PI4KIIIβ isoform. Regarding safety and toxicity, the CC50 of MI 14 against human HeLa cells was found to be greater than 50 μM, indicating a favorable therapeutic window. In conclusion, MI 14 is a highly selective and potent PI4KIIIβ inhibitor with significant potential for antiviral research.
Keywords
MI 14, 1715934-43-2, MI14, MI-14, PI4K, HCV, Phosphatidylinositol 4 kinases, PI4 kinases, Hepatitis C virus, Antiviral, HCV 1b, CVB3, HRVM, HVC 2a, Inhibitor
References