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Bioactive Compounds: Potential New Anti-inflammatory Drugs

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A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Bioactives and Nutraceuticals".

Deadline for manuscript submissions: closed (31 December 2022) | Viewed by 26805

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Prof. Dr. Yu-Hsiang Kuan

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Department of Pharmacology, School of Medicine, Chung Shan Medical University, No. 110, Sec. 1, Jianguo N. Rd., Taichung 402, Taiwan
Interests: apoptosis; inflammation; genotoxicity; acute lung injury; cellular signal
Special Issues, Collections and Topics in MDPI journals

Prof. Dr. Chunjung Chen

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Department of Medical Research, Taichung Veterans General Hospital, Taichung 407, Taiwan
Interests: luteolin; brain inflammation
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Inflammation is the important process of overexpression of proinflammatory and bactericidal mediators in the elimination of invasive pathogens and microbes. Acute and chronic inflammation lead to several diseases, such as acute lung injury, acute kidney injury, pneumonia, chronic obstructive pulmonary disease, hepatitis, cardiovascular disease, cancer, arthritis, spondylitis, etc. The World Health Organization (WHO) has proposed that inflammatory diseases are the greatest threat to human health in the world. The development of compounds able to effectively reduce the inflammatory responses and have no adverse effects is the topic of popular concern. Bioactive compounds are molecules and found from natural products including animals, plants, microbes, marine organisms. Bioactive compounds appear to have health benefits and therapeutic effects via anti-inflammation, anti-oxidation, immunomodulation, and anti-toxic effect. A growing number of signal transductions participate in the regulation of inflammation, including MAPK family pathway, IkB/NFkB pathway, JAK/STAT pathway, the priming and activating NLRP3 inflammasome, cytokine storm, pyroptosis pathway, apoptotic pathway, etc.

This Special Issue aims to cover original and review articles presenting outstanding data on the development of new bioactive compounds and relative molecular mechanisms for anti-inflammation.

Prof. Dr. Yu-Hsiang Kuan
Prof. Dr. Chunjung Chen
Guest Editors

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Keywords

bioactive compounds
anti-inflammation
anti-oxidation
immunomodulation
anti-toxic effect
health beneficial effect
signal transduction

Published Papers (9 papers)

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Research

15 pages, 2802 KiB

Open AccessArticle

Interfering with Color Response by Porphyrin-Related Compounds in the MTT Tetrazolium-Based Colorimetric Assay

by Bo Hee Choi, Mi-Ri Kim, Yu Na Jung, Smee Kang and Jungil Hong

Int. J. Mol. Sci. 2023, 24(1), 562; https://0-doi-org.brum.beds.ac.uk/10.3390/ijms24010562 - 29 Dec 2022

Cited by 2 | Viewed by 2102

Abstract

Porphyrin compounds are widely distributed in various natural products and biological systems. In this study, effects of porphyrin-related compounds including zinc protoporphyrin (ZnPP), protoporphyrin IX (PPIX), cyanocobalamin (CBL), hemin, and zinc phthalocyanine (ZnPC) were analyzed on color response of 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) tetrazolium-based assay, a commonly-used method for analyzing cell viability. Color responses of MTT formazan formed in cells treated with ZnPP, PPIX, or ZnPC were significantly reduced even at submicromolar concentrations without affecting cell viability, whereas hemin and CBL did not. ZnPP, PPIX, and ZnPC rapidly induced degradation of MTT formazan already-produced by cells when exposed to light, but not under a dark condition. Photosensitizing properties of the three compounds were also verified through extensive generation of reactive oxygen species under light. The porphyrins did not affect the stability of water-soluble formazans including XTT, WST-1, WST-8, and MTS formazans. Several factors including different light sources and antioxidants modulated the degradation process of MTT formazan by the porphyrins. The results suggest that certain porphyrin compounds could cause a severe artifact in the MTT assay through rapid degradation of formazan dye due to their photosensitizing property, which needs to be considered carefully in the related assays. Full article

(This article belongs to the Special Issue Bioactive Compounds: Potential New Anti-inflammatory Drugs)

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31 pages, 13610 KiB

Open AccessArticle

ROS-Induced DNA-Damage and Autophagy in Oral Squamous Cell Carcinoma by Usnea barbata Oil Extract—An In Vitro Study

by Violeta Popovici, Adina Magdalena Musuc, Elena Matei, Oana Karampelas, Emma Adriana Ozon, Georgeta Camelia Cozaru, Verginica Schröder, Laura Bucur, Ludmila Aricov, Mihai Anastasescu, Mariana Așchie, Victoria Badea, Dumitru Lupuliasa and Cerasela Elena Gîrd

Int. J. Mol. Sci. 2022, 23(23), 14836; https://doi.org/10.3390/ijms232314836 - 27 Nov 2022

Cited by 5 | Viewed by 2138

Abstract

Oxidative stress is associated with aging, cancers, and numerous metabolic and chronic disorders, and phenolic compounds are well known for their health-promoting role due to their free-radical scavenging activity. These phytochemicals could also exhibit pro-oxidant effects. Due to its bioactive phenolic secondary metabolites, Usnea barbata (L.) Weber ex. F.H. Wigg (U. barbata) displays anticancer and antioxidant activities and has been used as a phytomedicine for thousands of years. The present work aims to analyze the properties of U. barbata extract in canola oil (UBO). The UBO cytotoxicity on oral squamous cell carcinoma (OSCC) CLS-354 cell line and blood cell cultures was explored through complex flow cytometry analyses regarding apoptosis, reactive oxygen species (ROS) levels, the enzymatic activity of caspase 3/7, cell cycle, nuclear shrinkage (NS), autophagy (A), and synthesis of deoxyribonucleic acid (DNA). All these studies were concomitantly performed on canola oil (CNO) to evidence the interaction of lichen metabolites with the constituents of this green solvent used for extraction. The obtained data evidenced that UBO inhibited CLS-354 oral cancer cell proliferation through ROS generation (316.67 × 10⁴), determining higher levels of nuclear shrinkage (40.12%), cell cycle arrest in G0/G1 (92.51%; G0 is the differentiation phase, while during G1 phase occurs preparation for cell division), DNA fragmentation (2.97%), and autophagy (62.98%) than in blood cells. At a substantially higher ROS level in blood cells (5250.00 × 10⁴), the processes that lead to cell death—NS (30.05%), cell cycle arrest in G0/G1 (86.30%), DNA fragmentation (0.72%), and autophagy (39.37%)—are considerably lower than in CLS-354 oral cancer cells. Our work reveals the ROS-mediated anticancer potential of UBO through DNA damage and autophagy. Moreover, the present study suggests that UBO pharmacological potential could result from the synergism between lichen secondary metabolites and canola oil phytoconstituents. Full article

(This article belongs to the Special Issue Bioactive Compounds: Potential New Anti-inflammatory Drugs)

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18 pages, 4097 KiB

Open AccessArticle

Protective Effects of the Chalcone-Based Derivative AN07 on Inflammation-Associated Myotube Atrophy Induced by Lipopolysaccharide

by Wei-Yu Fang, Chih-Lung Lin, Wan-Hsuan Chang, Chih-Hsiang Chang, Yun-Cian Huang, Yi-Hong Tsai, Fang-Rong Chang and Yi-Ching Lo

Int. J. Mol. Sci. 2022, 23(21), 12929; https://0-doi-org.brum.beds.ac.uk/10.3390/ijms232112929 - 26 Oct 2022

Cited by 1 | Viewed by 1794

Abstract

Inflammation is a major cause of skeletal muscle atrophy in various diseases. 2-Hydroxy-4′-methoxychalcone (AN07) is a chalcone-based peroxisome-proliferator-activated receptor gamma (PPARγ) agonist with various effects, such as antiatherosclerosis, anti-inflammation, antioxidative stress, and neuroprotection. In this study, we examined the effects of AN07 on protein homeostasis pathway and mitochondrial function in inflammation-associated myotube atrophy induced by lipopolysaccharides (LPS). We found that AN07 significantly attenuated NF-κB activation, inflammatory factors (TNF-α, IL-1β, COX-2, and PGE2), Nox4 expression, and reactive oxygen species levels in LPS-treated C2C12 myotubes. Moreover, AN07 increased SOD2 expression and improved mitochondrial function, including mitochondrial membrane potential and mitochondrial oxygen consumption rate. We also demonstrated that AN07 attenuated LPS-induced reduction of myotube diameter, MyHC expression, and IGF-1/IGF-1R/p-Akt-mediated protein synthesis signaling. Additionally, AN07 downregulated LPS-induced autophagy–lysosomal protein degradation molecules (LC3-II/LC3-I and degraded p62) and ubiquitin–proteasome protein degradation molecules (n-FoxO1a/MuRF1/atrogin-1). However, the regulatory effects of AN07 on protein synthesis and degradation signaling were inhibited by the IGF-1R inhibitor AG1024 and the PI3K inhibitor wortmannin. In addition, the PPARγ antagonist GW9662 attenuated the effects of AN07 against LPS-induced inflammation, oxidation, and protein catabolism. In conclusion, our findings suggest that AN07 possesses protective effects on inflammation-induced myotube atrophy and mitochondrial dysfunction. Full article

(This article belongs to the Special Issue Bioactive Compounds: Potential New Anti-inflammatory Drugs)

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14 pages, 11468 KiB

Open AccessArticle

Protective Effect of Rutin on Triethylene Glycol Dimethacrylate-Induced Toxicity through the Inhibition of Caspase Activation and Reactive Oxygen Species Generation in Macrophages

by Li-Chiu Yang, Yu-Chao Chang, Kun-Lin Yeh, Fu-Mei Huang, Ni-Yu Su and Yu-Hsiang Kuan

Int. J. Mol. Sci. 2022, 23(19), 11773; https://0-doi-org.brum.beds.ac.uk/10.3390/ijms231911773 - 04 Oct 2022

Cited by 8 | Viewed by 1645

Abstract

Rutin, also called quercetin-3-rhamnosyl glucoside, is a natural flavonol glycoside present in many plants. Rutin is used to treat various diseases, such as inflammation, diabetes, and cancer. For polymeric biomaterials, triethylene glycol dimethacrylate (TEGDMA) is the most commonly used monomer and serves as a restorative resin, a dentin bonding agent and sealant, and a bone cement component. Overall, TEGDMA induces various toxic effects in macrophages, including cytotoxicity, apoptosis, and genotoxicity. The aim of this study was to investigate the protective mechanism of rutin in alleviating TEGDMA-induced toxicity in RAW264.7 macrophages. After treatment with rutin, we assessed the cell viability and apoptosis of TEGDMA-induced RAW264.7 macrophages using an methylthiazol tetrazolium (MTT) assay and Annexin V-FITC/propidium iodide assay, respectively. Subsequently, we assessed the level of genotoxicity using comet and micronucleus assays, assessed the cysteinyla aspartate specific proteinases (caspases) and antioxidant enzyme (AOE) activity using commercial kits, and evaluated the generation of reactive oxygen species (ROS) using a dichlorodihydrofluorescein diacetate (DCFH-DA) assay. We evaluated the expression of heme oxygenase (HO)-1, the expression of nuclear factor erythroid 2 related factor (Nrf-2), and phosphorylation of AMP activated protein kinase (AMPK) using the Western blot assay. The results indicated that rutin substantially reduced the level of cytotoxicity, apoptosis, and genotoxicity of TEGDMA-induced RAW264.7 macrophages. Rutin also blocked the activity of caspase-3, caspase-8, and caspase-9 in TEGDMA-stimulated RAW264.7 macrophages. In addition, it decreased TEGDMA-induced ROS generation and AOE deactivation in macrophages. Finally, we found that TEGDMA-inhibited slightly the HO-1 expression, Nrf-2 expression, and AMPK phosphorylation would be revered by rutin. In addition, the HO-1 expression, Nrf-2 expression, and AMPK phosphorylation was enhanced by rutin. These findings indicate that rutin suppresses TEGDMA-induced caspase-mediated toxic effects through ROS generation and antioxidative system deactivation through the Nrf-2/AMPK pathway. Therefore, rutin has the potential to serve as a novel antitoxicity agent for TEGDMA in RAW264.7 macrophages. Full article

(This article belongs to the Special Issue Bioactive Compounds: Potential New Anti-inflammatory Drugs)

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19 pages, 7581 KiB

Open AccessArticle

Bacterial Quorum-Sensing Signal DSF Inhibits LPS-Induced Inflammations by Suppressing Toll-like Receptor Signaling and Preventing Lysosome-Mediated Apoptosis in Zebrafish

by Hongjie Zhu, Zhihao Wang, Wenxin Wang, Yongbo Lu, Ya-Wen He and Jing Tian

Int. J. Mol. Sci. 2022, 23(13), 7110; https://0-doi-org.brum.beds.ac.uk/10.3390/ijms23137110 - 26 Jun 2022

Cited by 4 | Viewed by 2146

Abstract

Bacteria and their eukaryotic hosts have co-evolved for millions of years, and the former can intercept eukaryotic signaling systems for the successful colonization of the host. The diffusible signal factor (DSF) family represents a type of quorum-sensing signals found in diverse Gram-negative bacterial pathogens. Recent evidence shows that the DSF is involved in interkingdom communications between the bacterial pathogen and the host plant. In this study, we explored the anti-inflammatory effect of the DSF and its underlying molecular mechanism in a zebrafish model. We found that the DSF treatment exhibited a strong protective effect on the inflammatory response of zebrafish induced by lipopolysaccharide (LPS). In the LPS-induced inflammation zebrafish model, the DSF could significantly ameliorate the intestinal pathological injury, reduce abnormal migration and the aggregation of inflammatory cells, inhibit the excessive production of inflammatory mediator reactive oxygen species (ROS) content, and prevent apoptosis. Through an RNA-Seq analysis, a total of 938 differentially expressed genes (DEGs) was screened between LPS and LPS + DSF treatment zebrafish embryos. A further bioinformatics analysis and validation revealed that the DSF might inhibit the LPS-induced zebrafish inflammatory response by preventing the activation of signaling in the Toll-like receptor pathway, attenuating the expression of pro-inflammatory cytokines and chemokines, and regulating the activation of the caspase cascade through restoring the expression of lysosomal cathepsins and apoptosis signaling. This study, for the first time, demonstrates the anti-inflammatory role and a potential pharmaceutical application of the bacterial signal DSF. These findings also suggest that the interkingdom communication between DSF-producing bacteria and zebrafish might occur in nature. Full article

(This article belongs to the Special Issue Bioactive Compounds: Potential New Anti-inflammatory Drugs)

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13 pages, 2316 KiB

Open AccessArticle

Cichoric Acid May Play a Role in Protecting Hair Cells from Ototoxic Drugs

by Ting-Wei Lai, Hsin-Lin Cheng, Tzu-Rong Su, Jiann-Jou Yang and Ching-Chyuan Su

Int. J. Mol. Sci. 2022, 23(12), 6701; https://0-doi-org.brum.beds.ac.uk/10.3390/ijms23126701 - 16 Jun 2022

Cited by 2 | Viewed by 1660

Abstract

Ototoxic hearing loss due to antibiotic medication including aminoglycosides and excess free radical production causes irreversible hair cell injury. Cichoric acid, a naturally occurring phenolic acid, has recently been found to exert anti-oxidative and anti-inflammatory properties through its free radical scavenging capacity. The present study aimed to investigate the protective effects of cichoric acid against neomycin-induced ototoxicity using transgenic zebrafish (pvalb3b: TagGFP). Our results indicated that cichoric acid in concentrations up to 5 μM did not affect zebrafish viability during the 2 h treatment period. Therefore, the otoprotective concentration of cichoric acid was identified as 5 μM under 2 h treatment by counting viable hair cells within the neuromasts of the anterior- and posterior-lateral lines in the study. Pretreatment of transgenic zebrafish with 5 μM of cichoric acid for 2 h significantly protected against neomycin-induced hair cell death. Protection mediated by cichoric acid was, however, lost over time. A terminal deoxynucleotidyl transferase dUTP nick-end labeling (TUNEL) assay and FM4-64 staining, respectively, provided in situ evidence that cichoric acid ameliorated apoptotic signals and mechanotransduction machinery impairment caused by neomycin. A fish locomotor test (distance move, velocity, and rotation frequency) assessing behavioral alteration after ototoxic damage revealed rescue due to cichoric acid pretreatment before neomycin exposure. These findings suggest that cichoric acid in 5 μM under 2 h treatment has antioxidant effects and can attenuate neomycin-induced hair cell death in neuromasts. Although cichoric acid offered otoprotection, there is only a small difference between pharmacological and toxic concentrations, and hence cichoric acid can be considered a rather prototypical compound for the development of safer otoprotective compounds. Full article

(This article belongs to the Special Issue Bioactive Compounds: Potential New Anti-inflammatory Drugs)

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28 pages, 5792 KiB

Open AccessArticle

Oxy210, a Semi-Synthetic Oxysterol, Exerts Anti-Inflammatory Effects in Macrophages via Inhibition of Toll-like Receptor (TLR) 4 and TLR2 Signaling and Modulation of Macrophage Polarization

by Feng Wang, Frank Stappenbeck, Liu-Ya Tang, Ying E. Zhang, Simon T. Hui, Aldons J. Lusis and Farhad Parhami

Int. J. Mol. Sci. 2022, 23(10), 5478; https://0-doi-org.brum.beds.ac.uk/10.3390/ijms23105478 - 13 May 2022

Cited by 8 | Viewed by 3948

Abstract

Inflammatory responses by the innate and adaptive immune systems protect against infections and are essential to health and survival. Many diseases including atherosclerosis, osteoarthritis, rheumatoid arthritis, psoriasis, and obesity involve persistent chronic inflammation. Currently available anti-inflammatory agents, including non-steroidal anti-inflammatory drugs, steroids, and biologics, are often unsafe for chronic use due to adverse effects. The development of effective non-toxic anti-inflammatory agents for chronic use remains an important research arena. We previously reported that oral administration of Oxy210, a semi-synthetic oxysterol, ameliorates non-alcoholic steatohepatitis (NASH) induced by a high-fat diet in APOE*3-Leiden.CETP humanized mouse model of NASH and inhibits expression of hepatic and circulating levels of inflammatory cytokines. Here, we show that Oxy210 also inhibits diet-induced white adipose tissue inflammation in APOE*3-Leiden.CETP mice, evidenced by the inhibition of adipose tissue expression of IL-6, MCP-1, and CD68 macrophage marker. Oxy210 and related analogs exhibit anti-inflammatory effects in macrophages treated with lipopolysaccharide in vitro, mediated through inhibition of toll-like receptor 4 (TLR4), TLR2, and AP-1 signaling, independent of cyclooxygenase enzymes or steroid receptors. The anti-inflammatory effects of Oxy210 are correlated with the inhibition of macrophage polarization. We propose that Oxy210 and its structural analogs may be attractive candidates for future therapeutic development for targeting inflammatory diseases. Full article

(This article belongs to the Special Issue Bioactive Compounds: Potential New Anti-inflammatory Drugs)

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14 pages, 4056 KiB

Open AccessArticle

Prunetinoside Inhibits Lipopolysaccharide-Provoked Inflammatory Response via Suppressing NF-κB and Activating the JNK-Mediated Signaling Pathway in RAW264.7 Macrophage Cells

by Abuyaseer Abusaliya, Pritam Bhagwan Bhosale, Hun Hwan Kim, Sang Eun Ha, Min Yeong Park, Se Hyo Jeong, Preethi Vetrivel, Joon-Suk Park and Gon Sup Kim

Int. J. Mol. Sci. 2022, 23(10), 5442; https://0-doi-org.brum.beds.ac.uk/10.3390/ijms23105442 - 13 May 2022

Cited by 7 | Viewed by 1752

Abstract

Inflammation is a multifaceted response of the immune system at the site of injury or infection caused by pathogens or stress via immune cells. Due to the adverse effects of chemical drugs, plant-based compounds are gaining interest in current research. Prunetinoside or prunetin-5-O-glucoside (PUG) is a plant-based active compound, which possesses anti-inflammatory effects on immune cells. In this study, we investigate the effect of PUG on mouse macrophage RAW264.7 cells with or without stimulation of lipopolysaccharide (LPS). Cytotoxicity results showed that PUG is non-cytotoxic to the cells and it reversed the cytotoxicity in LPS-stimulated cells. The levels of nitric oxide (NO) and interleukin-6 (IL-6) were determined using a NO detection kit and IL-6 ELISA kit, respectively, and showed a significant decrease in NO and IL-6 in PUG-treated cells. Western blot and qRT-PCR were performed for the expression of two important pro-inflammatory cytokines, COX2 and iNOS, and found that their expression was downregulated in a dose-dependent manner. Other pro-inflammatory cytokines, such as IL-1β, IL-6, and TNFα, had reduced mRNA expression after PUG treatment. Furthermore, a Western blot was performed to calculate the expression of NF-κB and MAPK pathway proteins. The results show that PUG administration dramatically reduced the phosphorylation of p-Iκbα, p-NF-κB 65, and p-JNK. Remarkably, after PUG treatment, p-P38 and p-ERK remain unchanged. Furthermore, docking studies revealed that PUG is covalently linked to NF-κB and suppresses inflammation. In conclusion, PUG exerted the anti-inflammatory mechanism by barring the NF-κB pathway and activating JNK. Thus, prunetinoside could be adopted as a therapeutic compound for inflammatory-related conditions. Full article

(This article belongs to the Special Issue Bioactive Compounds: Potential New Anti-inflammatory Drugs)

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15 pages, 2117 KiB

Open AccessArticle

Anti-Inflammatory Activities of an Anti-Histamine Drug, Loratadine, by Suppressing TAK1 in AP-1 Pathway

by Jiwon Jang, Stephanie Triseptya Hunto, Ji Won Kim, Hwa Pyoung Lee, Han Gyung Kim and Jae Youl Cho

Int. J. Mol. Sci. 2022, 23(7), 3986; https://0-doi-org.brum.beds.ac.uk/10.3390/ijms23073986 - 03 Apr 2022

Cited by 4 | Viewed by 8702

Abstract

Loratadine is an anti-histamine routinely used for treating allergies. However, recent findings have shown that Loratadine may also have anti-inflammatory functions, while their exact mechanisms have not yet been fully uncovered. In this paper, we investigated whether Loratadine can be utilized as an anti-inflammatory drug through a series of in vitro and in vivo experiments using a murine macrophage cell line and an acute gastritis mouse model. Loratadine was found to dramatically reduce the expression of pro-inflammatory genes, including MMP1, MMP3, and MMP9, and inhibit AP-1 transcriptional activation, as demonstrated by the luciferase assay. Therefore, we decided to further explore its role in the AP-1 signaling pathway. The expression of c-Jun and c-Fos, AP-1 subunits, was repressed by Loratadine and, correspondingly, the expression of p-JNK, p-MKK7, and p-TAK1 was also inhibited. In addition, Loratadine was able to reduce gastric bleeding in acute gastritis-induced mice; Western blotting using the stomach samples showed reduced p-c-Fos protein levels. Loratadine was shown to effectively suppress inflammation by specifically targeting TAK1 and suppressing consequent AP-1 signaling pathway activation and inflammatory cytokine production. Full article

(This article belongs to the Special Issue Bioactive Compounds: Potential New Anti-inflammatory Drugs)

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