Cyclooxygenase-2 mRNA Expression Research Articles

Antioxidant, Antimicrobial, and Anti-Inflammatory Effects of Liriodendron chinense Leaves.

Liriodendron chinense has been widely utilized in traditional Chinese medicine to treat dispelling wind and dampness and used for alleviating cough and diminishing inflammation. However, the antioxidant, antimicrobial, and anti-inflammatory effects of L. chinense leaves and the key active constituents remained elusive. So, we conducted some experiments to support the application of L. chinense in traditional Chinese medicine by investigating the antioxidant, antibacterial, and anti-inflammatory abilities, and to identify the potential key constituents responsible for the activities. The ethanol extract of L. chinense leaves (LCLE) was isolated and extracted, and assays measuring ferric reducing antioxidant power, total reducing power, DPPH•, ABTS•+, and •OH were used to assess its in vitro antioxidant capacities. Antimicrobial activities of LCLE were investigated by minimal inhibitory levels, minimum antibacterial concentrations, disc diffusion test, and scanning electron microscope examination. Further, in vivo experiments including macro indicators examination, histopathological examination, and biochemical parameters measurement were conducted to investigate the effects of LCLE on lipopolysaccharide (LPS)-induced acute lung injury (ALI) in mice. LCLE was further isolated and purified through column chromatography, and LPS-induced RAW264.7 cells were constructed to assess the diminished inflammation potential of the identified chemical composites. ABTS•+ and •OH radicals were extensively neutralized by the LCLE treatment. LCLE administration also presented broad-spectrum antimicrobial properties, especially against Staphylococcus epidermidis by disrupting cell walls. LPS-induced ALI in mice was significantly ameliorated by LCLE intervention, as evidenced by the histological changes in the lung and liver tissues as well as the reductions of nitric oxide (NO), TNF-α, and IL-6 production. Furthermore, three novel compounds including fragransin B2, liriodendritol, and rhamnocitrin were isolated, purified, and identified from LCLE. These three compounds exhibited differential regulation on NO accumulation and IL-10, IL-1β, IL-6, TNF-α, COX-2, and iNOS mRNA expression in RAW264.7 cells induced by LPS. Fragransin B2 was more effective in inhibiting TNF-α mRNA expression, while rhamnocitrin was more powerful in inhibiting IL-6 mRNA expression. LCLE had significant antioxidant, antimicrobial, and anti-inflammatory effects. Fragransin B2, liriodendritol, and rhamnocitrin were probably key active constituents of LCLE, which might act synergistically to treat inflammatory-related disorders. This study provided a valuable view of the healing potential of L. chinense leaves in curing inflammatory diseases.

Titanium particle-induced inflammasome in human gingival epithelial cells

Background/purposePeri-implantitis remains a substantial challenge. This study investigated the effect of titanium particles on human oral epithelial cells, focusing on the nucleotide-binding domain and leucine-rich repeat protein (NLRP) 3 inflammasome. Materials and methodsThe Ca9-22 human gingival epithelial cell line was subjected to incubation with titanium particles. To evaluate cell viability, the MTT assay was employed. Total RNA was extracted, and messenger RNA (mRNA) expressions of COX2, TGF-β1, NLRP1, NLPR3, CASP1, and AIM2 were analyzed. The concentration of interleukin (IL)1β in cell supernatants was quantified through enzyme-linked immunosorbent assay. Intracellular reactive oxygen species (ROS) were visualized using an ROS assay Kit. ResultsCa9-22 cells treated with titanium particles showed >75% cell viability across all concentrations tested, with consistent results. mRNA expressions of inflammation-related genes (COX2 and TGF-β1) significantly increased in a dose-dependent manner. The mRNA expression of NLRP3 and CASP1, as well as the secretion of IL1β, increased after 6-h incubation with titanium particles. Moreover, the ROS assay results showed increased production of ROS after treatment with titanium particles, whereas NLRP3 expression and IL1β secretion reduced after treatment with N-acetyl-l-cysteine (ROS scavenger). ConclusionOur findings indicate that titanium particles possess a distinct ability to trigger the NLRP3 inflammasome, partly by producing ROS.

Sacubitril/valsartan ameliorates cardiac function and ventricular remodeling in CHF rats via the inhibition of the tryptophan/kynurenine metabolism and inflammation

Sacubitril/valsartan has been highly recognized as a treatment for Chronic heart failure (CHF). Its potential cardioprotective benefits and mechanisms, however, remain to be explored. Metabolomics can be used to identify the metabolic characteristics and related markers, as well as the influence of drugs, thereby opening up the new mechanism for sacubitril/valsartan therapy in CHF disease. In this study, the ligation of left anterior descending and exhaustive swimming were used to induce a rat model of CHF after myocardial infarction. The efficacy was appraised with echocardiography, serum NT-proBNP, and histopathologica. UPLC-Q/TOF–MS combined with multivariate statistical analysis approach were used to analyze the effect of sacubitril/valsartan on CHF rats. RT-qPCR and western blot were performed to investigate the tryptophan/kynurenine metabolism pathway. Accordingly, the basal cardiac function were increased, while the serum NT-proBNP and collagen volume fraction decreased in CHF rats with sacubitril/valsartan. Sacubitril/valsartan regulated the expression of kynurenine et.al 8 metabolomic biomarkers in CHF rats serum, and it contributed to the cardioprotective effects through tryptophan metabolism pathway. In addition, the mRNA and protein expression of the indoleamine 2,3-dioxygenase (IDO) in the myocardial tissue of CHF rats, were down-regulated by sacubitril/valsartan, which was the same with the IL-1β, IFN-γ, TNF-α, COX-2, and IL-6 mRNA expression, and IL-1β, IFN-γ, and TNF-α expression in serum. In conclusion, sacubitril/valsartan can ameliorate cardiac function and ventricular remodeling in CHF rats, at least in part through inhibition of tryptophan/kynurenine metabolism.

Oroxylin A inhibits inflammatory cytokines in periodontitis via HO‑1.

Periodontal disease is a common infectious disease that can lead to the loss of teeth. Hower how to effectively suppress the inflammation with medication is unclear. The aim of the present study was to investigate the anti‑inflammatory effect of Oroxylin A in periodontitis and its potential role through heme oxygenase‑1 (HO‑1). Primary rat gingival fibroblasts (RGFs) were cultured using the tissue block method and identified by immunofluorescence. Following lipopolysaccharide (LPS) stimulation of RGFs, Oroxylin A was administered at 50, 100, 200 or 400 µg/ml. Reverse transcription‑quantitative PCR was used to assess mRNA expression of cyclooxygenase (COX)‑2, TNF‑α, RANKL and osteoprotegerin (OPG). Western blotting was used to detect protein expression levels of COX ‑2, TNF‑α, RANKL and OPG. Following HO‑1 knockdown, the same treatment was performed. The expression of COX‑2 in rat gingival tissue was observed by immunohistochemistry. One‑way analysis of variance and Student's t test were used for statistical analysis. Oroxylin A downregulated mRNA expression of COX‑2, TNF‑α, RANKL and OPG in LPS‑induced RGFs. With increase of Oroxylin A dose, the expression of HO‑1 was gradually upregulated. When HO‑1 was knocked down, Oroxylin A did not downregulate the expression of COX‑2, TNF‑α, RANKL and OPG in LPS‑induced RGFs. Immunohistochemical results showed that expression of COX‑2 was downregulated by Oroxylin A, and the expression of TNF‑α, RANKL and OPG were also downregulated. Oroxylin A decreased expression of inflammatory cytokines in LPS‑induced RGFs and had a good inhibitory effect on periodontitis in rats.

The correlation between fecal microbiota profiles and intracellular junction genes expression in young Iranian patients with celiac disease

ABSTRACT Celiac disease (CD) is characterized by the disruption of the intestinal barrier integrity and alterations in the microbiota composition. This study aimed to evaluate the changes in the fecal microbiota profile and mRNA expressions of intracellular junction-related genes in pediatric patients with CD compared to healthy controls (HCs). Thirty treated CD patients, 10 active CD, and 40 HCs were recruited. Peripheral blood (PB) and fecal samples were collected. Microbiota analysis was performed using quantitative real-time PCR (qPCR) test. The mRNA expressions of ZO-1, occludin, β-catenin, E-cadherin, and COX-2 were also evaluated. In active and treated CD patients, the PB expression levels of ZO-1 (p = 0.04 and 0.002, respectively) and β-catenin (p = 0.006 and 0.02, respectively) were lower than in HCs. PB Occludin’s level was upregulated in both active and treated CD patients compared to HCs (p = 0.04 and 0.02, respectively). However, PB E-cadherin and COX-2 expression levels and fecal mRNA expressions of ZO-1, occludin, and COX-2 did not differ significantly between cases and HCs (P˃0.05). Active CD patients had a higher relative abundance of the Firmicutes (p = 0.04) and Actinobacteria (p = 0.03) phyla compared to treated subjects. The relative abundance of Veillonella (p = 0.04) and Staphylococcus (p = 0.01) genera was lower in active patients in comparison to HCs. Researchers should explore the precise impact of the gut microbiome on the molecules and mechanisms involved in intestinal damage of CD. Special attention should be given to Bifidobacteria and Enterobacteriaceae, as they have shown a significant correlation with the expression of tight junction-related genes.

Deletion of AT1a Receptors Selectively in Renomedullary Interstitial Cells Attenuates Basal, Angiotensin II-, or Vasopressin-induced Vasoactive Factors' mRNA Expression in The Mouse Kidney Medulla

We recently shown that deletion of the vasoactive peptide angiotensin II (Ang II) AT1a receptors selectively in renomedullary interstitial cells (RMICs) of the kidney medulla significantly lowered basal blood pressure and impaired urine concentration in mice. However, the underlying signaling mechanisms involved remains poorly understood. In the present study, AT1a receptors were selectively deleted in the RMICs of the mouse kidney medulla using tamoxifen-inducible Tenascin-C-CreER2/Agtr1af/f approach. Three groups of adult male wild-type (WT) and RMIC- Agtr1a−/− mice (n=6-10) were pretreated with or without tamoxifen (150 mg/kg, i.p., for 5 days) before Ang II was infused to induce Ang II-dependent hypertension (~0.75 mg/kg/day, i.p., for 2 weeks). Systolic, diastolic, and mean arterial blood pressure and urine osmolality were determined before and after Ang II treatment. At the end of the experiment, the kidneys were harvested, and the inner and outer medulla were dissected out for the measurement of the mRNA expression of key vasoactive factors that are associated with the regulation of blood pressure and urine concentration using digital droplet PCR. Deletion of AT1a receptors in RMICs significantly decreased AT1a receptor mRNA expression by 41% (WT: 554 ± 49 vs. RMIC- Agtr1a−/−: 327 ± 10 copies/ng RNA; P<0.01) and bradykinin B2 receptor mRNA expression by 52% (WT: 10.10 ± 0.75 vs. RMIC- Agtr1a−/−: 4.90 ± 0.56 copies/ng RNA; P<0.01), without altering the expression of endothelin ETB (WT: 466 ± 21 vs. RMIC- Agtr1a−/−: 393 ± 24 copies/ng RNA; n.s.) and vasopressin V2 receptor mRNAs in the kidney medulla (WT: 580 ± 60 vs. RMIC- Agtr1a−/−: 586 ± 61 copies/ng RNA; n.s.). Deletion of AT1a receptors in RMICs also significantly decreased the expression of eNOS (WT: 87.0 ± 3.0 vs. RMIC- Agtr1a−/−: 61.2 ± 2.8 copies/ng RNA; P<0.01) and aquaporin 2 (AQP2) mRNAs (WT: 12463 ± 2015 vs. RMIC- Agtr1a−/−: 6613 ± 692 copies/ng RNA; P<0.01). Interestingly, deletion of AT1a receptors in RMICs did not alter the mRNA expression of cyclooxygenase-2 (COX-2, n.s.), prostaglandin E2 (PGE2, n.s.), epithelial sodium channel (ENaC, n.s.) or prorenin receptors (PRR, n.s.) in the kidney medulla. In response to Ang II infusion, deletion of AT1a receptors in RMICs significantly attenuated Ang II-induced expression of bradykinin B2 receptors, COX-2, eNOS, and AQP2 mRNAs ( P<0.01), respectively. Furthermore, deletion of AT1a receptors in RMICs also significantly attenuated vasopressin-induced bradykinin B2 receptor, eNOS, and AQP2 mRNA expression in the kidney medulla ( P<0.01). We concluded that AT1a receptors in RMICs in the kidney medulla play an important role in maintaining physiological blood pressure homeostasis and urine concentration process likely via AT1a receptor/bradykinin B2 receptor/eNOS/AQP2-mediated signaling pathways. This is the full abstract presented at the American Physiology Summit 2024 meeting and is only available in HTML format. There are no additional versions or additional content available for this abstract. Physiology was not involved in the peer review process.

Silkworm pupa protein-derived peptides alleviate LPS-induced inflammatory response in RAW264.7 macrophage cells through the NF-κB/MAPK/PI3K-AKT signaling pathway

A plethora of studies have indicated that protein or peptides derived from food sources possess potential anti-inflammatory activity. In our previous research, we discovered peptides from silkworm pupae (Bombyx mori) exhibited promising anti-inflammatory effects in mice. However, the anti-inflammatory activity of silkworm pupae protein peptides (SPP) has yet to be validated at the cellular level, and its underlying anti-inflammatory mechanisms remain unclear. Therefore, the aim of this study was to explore the anti-inflammatory potential of SPP in lipopolysaccharide (LPS)-induced RAW264.7 inflammation model. Our research findings demonstrated that SPP significantly reduced LPS-induced inflammation in RAW264.7 cells in a dose-dependent manner, including decreased levels of inflammatory mediators (NO, MCP-1, and PEG2) and cytokines (TNF-α, IL-6, and IL-1β). Furthermore, we observed significant downregulation of mRNA and protein expression of iNOS and COX-2 by SPP (p < 0.05). Additionally, SPP exerted its anti-inflammatory effects by inhibiting the NF-κB/MAPK/PI3K signaling pathway. These results suggested that SPP may serve as a novel functional food ingredient for the prevention or treatment of inflammation-related diseases.

Neuroprotective Effect of Lithospermum officinale Callus Extract on Inflamed Primary Microglial Cells.

Plants that have therapeutic features for humans or animals are commonly referred to as "medicinal plants". They produce secondary metabolites with antioxidant, antimicrobial and/or anti-cancer effects. Lithospermum officinale, known as European stone seed, is a famous medicinal herb. However, due to the pyrrolizidine alkaloids (PzAl) in the root extract of L.officinal, there are therapeutic limitations to this herb. This research was devoted to the evaluation of the anti-inflammatory capacity of methanolic extracts of L. officinale callus (LoE) (fresh cells) on rat microglial cells, the immune cells of the Central Nervous System, which play an essential role in the responses to neuroinflammation. Primary microglia were obtained from neonatal Wistar rats (1 to 3-days old), and then treated with various concentration of CfA and methanolic extracts of 17 and 31-day-old L. officinale callus before LPS-stimulation. In addition to HPLC analysis of the extracts, viability, nitric oxide production, and evaluation of pro-inflammatory genes and cytokines in the inflamed microglia were investigated by MTT, Griess methos, qrt-PCR, and ELISA. Methanolic extract of the 17-day-old callus of L. officinale exhibited anti-inflammatory effects on LPS-stimulated microglial cells much higher than observed for CfA. The data were further supported by the decreased expression of Nos2, Tnf-α, and Cox-2 mRNA and the suppression of TNF-α and IL-1β release in the activated microglial cells pretreated with the effective dose of LoE (0.8 mg mL-1). It was assumed that the better anti-neuroinflammatory performance of LoE than CfA in LPS-activated primary microglia could be a result of the synergism of the components of the extract and the lipophilic nature of RsA as the main phenolic acid of LoE. Considering that LoE shows a high antioxidant capacity and lacks PzAl, it is anticipated that LoE extract might be considered a reliable substitute to play a key role in the preparation of neuroprotective pharmaceutical formulas, which require in vivo research and further experiments.

Analgesic and anti-inflammatory effects of galangin: a potential pathway to inhibit transient receptor potential vanilloid 1 receptor activation.

Galangin, commonly employed in traditional Chinese medicine for its diverse medicinal properties, exhibits potential in treating inflammatory pain. Nevertheless, its mechanism of action remains unclear. Mice were randomly divided into 4 groups for 7 days: a normal control group, a galangin-treated (25 and 50 mg/kg), and a positive control celecoxib (20 mg/kg). Analgesic and anti-inflammatory effects were evaluated using a hot plate test, acetic acid-induced writhing test, acetic acid-induced vascular permeability test, formalininduced paw licking test, and carrageenan-induced paw swelling test. The interplay between galangin, transient receptor potential vanilloid 1 (TRPV1), NF-κB, COX-2, and TNF-α proteins was evaluated via molecular docking. COX- 2, PGE2, IL-1β, IL-6, and TNF-α levels in serum were measured using ELISA after capsaicin administration (200 nmol/L). TRPV1 expression in the dorsal root ganglion was analyzed by Western blot. The quantities of substance P (SP) and calcitonin gene-related peptide (CGRP) were assessed using qPCR. Galangin reduced hot plate-induced licking latency, acetic acid-induced contortions, carrageenantriggered foot inflammation, and capillary permeability in mice. It exhibited favorable affinity towards TRPV1, NF- κB, COX-2, and TNF-α, resulting in decreased levels of COX-2, PGE2, IL-1β, IL-6, and TNF-α in serum following capsaicin stimulation. Galangin effectively suppressed the upregulation of TRPV1 protein and associated receptor neuropeptides CGRP and SP mRNA, while concurrently inhibiting the expression of NF-κB, TNF-α, COX-2, and PGE2 mRNA. Galangin exerts its anti-inflammatory pain effects by inhibiting TRPV1 activation and regulating COX-2, NF-κB/TNF-α expression, providing evidence for the use of galangin in the management of inflammatory pain.

Liquiritin ameliorates acute myocardial infarction via the COX-2/NLRP3 signaling pathway: network pharmacology and experimental validation

Liquiritin is beneficial to cardiovascular diseases, including myocardial hypoxia/reoxygenation (H/R) injury, myocardial hypertrophy, and acute myocardial infarction (AMI). However, the mechanism of liquiritin on AMI is unknown. This study is of great significance for elucidating the mechanism of liquiritin in preventing and treating AMI and developing cardiovascular protective drugs. Network pharmacology and molecular docking were used to screen the targets of liquiritin. AMI rats were built by coronary left anterior descending ligation. Echocardiography was used to monitor cardiac function; HE staining was used to detect pathological changes, and cardiac enzymes were detected. The expressions of COX-2, NLRP3, Caspase-1, ASC, and GSDMD were detected by RT-PCR and Western Blot. ELISA was used for the detection of IL-1β and IL-18 expression. COX-2 was detected as the most considerable protein in the PPI network. Molecular docking predicted that liquiritin has a high binding affinity with COX-2. AMI model rats showed significantly lower EF and FS (P&lt;0.01) and increased LVIDd and LVIDs (P&lt;0.01), which were improved by liquiritin. Liquiritin significantly reduced cardiac pathological changes and decreased LDH, CK, cTn-I, and BNP levels. Liquiritin reduced the mRNA and protein expressions of COX-2, NLRP3, Caspase-1, ASC, and GSDMD. Liquiritin inhibited IL-1β and IL-18 overexpression. Liquiritin has a better effect against AMI, and its mechanism is related to inhibiting the COX-2/NLRP3 signaling pathway.

Evaluating the Anti-Osteoarthritis Potential of Standardized Boswellia serrata Gum Resin Extract in Alleviating Knee Joint Pathology and Inflammation in Osteoarthritis-Induced Models.

Osteoarthritis is a widespread chronic degenerative disease marked by the deterioration of articular cartilage, modifications in subchondral bone, and a spectrum of symptoms, including pain, stiffness, and disability. Ultimately, this condition impairs the patient's quality of life. This study aimed to evaluate the therapeutic efficacy of standardized Boswellia serrata gum resin extract (BSRE) in a rat model of monosodium iodoacetate (MIA)-induced osteoarthritis. A total of 60 rats were allocated into six groups: normal control group (NC), osteoarthritis control (injected with MIA, OC), O + B50 (injected with MIA and treated with 50 mg/kg body weight (BW) BSRE), O + B75 (injected with MIA and treated with 75 mg/kg BW BSRE), O + B100 (injected with MIA and treated with 100 mg/kg BW BSRE), and O + M (injected with MIA and treated with 150 mg/kg BW methyl sulfonyl methane). Several parameters, including knee joint swelling, histopathological changes, and the expression of collagen type II alpha 1 (COL2A1) and aggrecan, were comprehensively assessed. Concurrently, the serum levels and mRNA expression of inflammatory mediators, cytokines, and matrix metalloproteinases (MMPs) were analyzed in both the serum and knee joint synovium. The results demonstrated that BSRE significantly mitigated knee joint swelling, cartilage destruction, and tissue deformation. Notably, BSRE administration markedly upregulated the expression of COL2A1 and aggrecan while concurrently reducing levels of nitric oxide, prostaglandin E2, leukotriene B4, interleukin (IL)-6, and tumor necrosis factor (TNF)-α. Furthermore, a substantial decrease was observed in the mRNA expression of inducible nitric oxide synthase, cyclooxygenase-2, 5-lipoxygenase, IL-6, TNF-α and MMP-3 and -13, thereby indicating promising therapeutic implications for osteoarthritis. In conclusion, BSRE exhibited anti-inflammatory properties and inhibited cartilage matrix degradation in a rat model of MIA-induced osteoarthritis, with the O + B100 group showing significant reductions in swelling and notable improvements in joint cartilage damage. These findings illuminate the preventive and therapeutic potential of BSRE for osteoarthritis treatment, emphasizing the criticality of exhaustive evaluation of novel compounds.

Effect of heat exposure on prostaglandin production and expression of COX-2, PGES, PGFS, ITGAV and LGALS15 mRNAs in endometrial epithelial cells of buffalo (Bubalus bubalis).

Early embryonic mortality is one of the major intriguing factors of reproductive failure that causes considerable challenge to the mammalian cell biologists. Heat stress is the major factor responsible for reduced fertility in farm animals. The present study aimed to investigate the influence of heat stress on prostaglandin production and the expression of key genes, including COX-2, PGES, PGFS, ITGAV and LGALS15, in buffalo endometrial epithelial cells. Buffalo genitalia containing ovaries with corpus luteum (CL) were collected immediately post-slaughter. The stages of the estrous cycle were determined based on macroscopic observations of the ovaries. Uterine lumens of the mid-luteal phase (days 6-10 of the estrous cycle) were washed and treated with trypsin to isolate epithelial cells, which were then cultured at control temperature (38.5°C for 24h) or exposed to elevated temperatures [38.5°C for 6h, 40.5°C for 18h; Heat Stressed (HS)]. The supernatant and endometrial epithelial cells were collected at various time points (0, 3, 6, 12, and 24h) from both the control and treatment groups. Although heat stress (40.5°C) significantly (P < 0.05) increased COX-2, PGES, and PGFS transcripts in epithelial cells but it did not affect the in vitro production of PGF2α and PGE2. The expression of ITGAV and LGALS15 mRNAs in endometrial epithelial cells remained unaltered under elevated temperature conditions. It can be concluded that elevated temperature did not directly modulate prostaglandin production but, it promoted the expression of COX-2, PGES and PGFS mRNA in buffalo endometrial epithelial cells.

Anti-inflammatory effects of the Thai herbal remedy Yataprasen and biflavonoids isolated from Putranjiva roxburghii in RAW264.7 macrophages

Ethnopharmacological relevanceYataprasen is a topical Thai herbal remedy for the treatment of musculoskeletal pain and is included in Kumpe Thart Phra Narai, the first Thai textbook of traditional medicine. The herbal preparation is made from a hydroethanolic extract of a mixture of 13 medicinal plants, of which Putranjiva roxburghii Wall. leaves are the major ingredient. Aim of the studyIn this study, we investigated the underlying mechanism of action for the anti-inflammatory effects of the Yataprasen remedy, its main ingredients, and the phytochemicals isolated from P. roxburghii leaves. Materials and methodsThe anti-inflammatory effects of the Yataprasen remedy, along with its main ingredients, including the leaves of Baliospermum solanifolium (Burm.) Suresh, Melia azedarach L., P. roxburghii, Senna siamea (Lam.) Irwin & Barneby, and Tamarindus indica L. were determined by measuring prostaglandin E2 (PGE2) secretion, nitric oxide (NO) production, and the synthesis of inflammatory biomarkers in lipopolysaccharide (LPS)-treated RAW264.7 macrophage cells. The active ingredients of the P. roxburghii leaves were separated by chromatography and spectroscopic measurements were used to identify their chemical structures. ResultsEthanol extracts of the Yataprasen remedy and some of its ingredients significantly suppressed LPS-induced PGE2 secretion and NO production in a dose-dependent manner. Treatment of RAW264.7 cells with ethanolic extracts of the Yataprasen remedy (50 μg/mL) significantly inhibited LPS-induced mRNA expression of TNF-α, COX-2, iNOS, and NF-κB. Among the plant ingredient extracts, P. roxburghii leaf extract exhibited the highest inhibitory effects on LPS-induced TNF-α and iNOS expression. Moreover, T. indica leaf extract showed the highest activity on the inhibition of LPS-induced COX-2 and NF-κB expression. Putraflavone, podocarpusflavone A, and amentoflavone were isolated biflavonoids from P. roxburghii leaf extract and showed the inhibitory effects on LPS-induced PGE2 secretion and NO synthesis in RAW264.7 cells. Of the isolated biflavonoids, amentoflavone exhibited the strongest anti-inflammatory activity by inhibiting the expression of TNF-α, COX-2, and iNOS. ConclusionThe results support reported the anti-inflammatory effects of the Yataprasen remedy, which are associated with the downregulation of proinflammatory mediators. P. roxburghii, along with its biflavonoids, are the impact components that contribute to the anti-inflammatory effects of the herbal remedy.

A Promising Functional Food for Diabetes Prevention, Antioxidation, and Anti-inflammation of Green Coffee Bean Extract

Functional foods and nutrition have become increasingly popular in preventing and reducing the incidence of diabetes. Green coffee bean extract (GCBE) has received much interest because of the evidence that coffee consumption reduces the risk of diabetes and many inflammatory diseases. This study was designed to investigate the phytochemicals contained in GCBE and their antioxidant, anti-diabetic, and anti-inflammatory efficacies. GCBE phytochemicals were analyzed using high-performance liquid chromatography (HPLC). This analysis demonstrated that chlorogenic acid was the predominant component of GCBE, followed by caffeine and caffeic acid. The antioxidant capacity of GCBE was assessed using the 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 2,2’-azinobis 3-ethylbenzothiazoline-6-sulfonic acid (ABTS) assays, demonstrating significant scavenging capacity with IC50 values of 2.96 ± 1.04 and 7.63 ± 1.03 µg/mL, respectively. The anti-hyperlipidemic efficacy of GCBE was observed through inhibiting cholesterol absorption (by increasing micelle sizes and decreasing cholesterol solubility), lipid digestion, and pancreatic lipase activity in vitro. The investigations revealed that GCBE possessed anti-hyperlipidemic properties by inhibiting cholesterol absorption, lipid digestion, and pancreatic lipase activity. Specifically, GCBE increased micelle particle sizes by ~6.5-fold, decreased cholesterol solubility by 2-fold, and reduced pancreatic lipase activity by 25%. Additionally, the in vitroanti-hyperglycemic activity of GCBE was evaluated by inhibition of α-amylase and α-glucosidase capacity. GCBE demonstrated anti-hyperglycemic activity by inhibiting α-amylase activity (32.80 ± 7.06% inhibition), while α-glucosidase activity remained unaffected. The anti-inflammatory potential of GCBE was evaluated by mRNA regulation using RT-PCR analysis. This analysis revealed that GCBE attenuated mRNA expression of COX-2, TNF-α, IL-1b, and IL-6 in LPS-induced RAW264.7 cells. GCBE’s antioxidant, anti-hyperlipidemic, and anti-hyperglycemic efficacies and its molecular mechanisms in modulating the inflammation pathway found in the present study highlight its potential as a supplement in functional foods or beverages. Doi: 10.28991/HEF-2024-05-01-08 Full Text: PDF

Helicobacter pylori vacA affects the expression of COX-2 in the duodenal mucosa of patients with duodenitis.

Duodenitis refers to inflammation that occurs in the duodenum. Helicobacter pylori (Hp) is a known risk factor for duodenitis. This paper attempted to analyze the correlation between Hp virulence genotypes and the initiation and development of duodenal bulbar inflammation (DBI) to lay the foundation for the management of duodenitis induced by Hp infection. Total RNA was extracted from duodenal samples of 156 Hp-positive patients [70 with DBI and 86 with duodenal bulbar ulcer (DBU)] and 80 Hp-free DBI patients, followed by RT-qPCR detection of COX-2 mRNA expression and the presence of virulence factors. The cagA positive (62.2%), vacAs1 (21.79%), vacAm2 (23.72%), vacAs1m2 (19.87%) and iceA1 (55.80%) genotypes were dominant in 156 Hp-positive samples. Statistical difference was observed in vacAs and vacA mixtures between DBI and DBU patients. Gastric metaplasia had an association with vacA allelotypes, and its occurrence had strong correlations with vacAs1 and vacAs1m2 genotypes. The vacAs1 and vacAs1m2 genotypes were correlated with gastric metaplasia occurrence (all p<0.05). There were significant correlations between vacAs and vacA mixtures with cagA genotypes, and between iceA genotypes with vacA mixtures (all p<0.05). COX-2 was strongly expressed in Hp-infected duodenal mucosa and showed correlations with vacA genotype. COX-2 was differentially expressed in vacAs1- and vacAs2-positive patients. COX-2 was more highly upregulated in vacAs1m1- and vacAs1m2-positive patients than vacAs2m2-positive patients. Overall, Hp virulence genotype vacA was correlated with DBI and DBU initiation and development.

Elucidating the mechanisms of formononetin in modulating atherosclerotic plaque formation in ApoE-/- mice

BackgroundAtherosclerosis(AS) poses a pressing challenge in contemporary medicine. Formononetin (FMN) plays a crucial role in its prevention and treatment. However, the detailed impact of FMN on the stability of atherosclerotic plaques and its underlying mechanisms remain to be elucidated.MethodsAn intervention consisting of FMN was given along with a high-fat food regimen in the ApoE-/- mouse model. The investigation included the evaluation of the degree of atherosclerotic lesion, the main components of the plaque, lipid profiles, particular markers indicating M1/M2 macrophage phenotypes, the quantities of factors related to inflammation, the infiltration of macrophages, and the identification of markers linked to the α7nAChR/JAK2/STAT3 axis effect molecules.ResultsThe evaluation of aortic morphology in ApoE-/-mice revealed that FMN significantly improved the plaque area, fibrous cap protrusion, lipid deposition, and structural alterations on the aortic surface, among other markers of atherosclerosis,and there is concentration dependence. Furthermore, the lipid content of mouse serum was assessed, and the results showed that the low-, medium-, and high-dosage FMN groups had significantly lower levels of LDL-C, ox-LDL, TC, and TG. The results of immunohistochemical staining indicated that the low-, medium-, and high-dose FMN therapy groups had enhanced CD206 expression and decreased expression of CD68 and iNOS. According to RT-qPCR data, FMN intervention has the potential to suppress the expression of iNOS, COX-2, miR-155-5p, IL-6, and IL-1β mRNA, while promoting the expression of IL-10, SHIP1, and Arg-1 mRNA levels. However, the degree of inhibition varied among dosage groups. Western blot investigation of JAK/STAT signaling pathway proteins and cholinergic α7nAChR protein showed that p-JAK2 and p-STAT3 protein expression was suppressed at all dosages, whereas α7nAChR protein expression was enhanced.ConclusionsAccording to the aforementioned findings, FMN can reduce inflammation and atherosclerosis by influencing macrophage polarization, blocking the JAK/STAT signaling pathway, and increasing α7nAChR expression.

The pomegranate-derived peptide Pug-4 alleviates nontypeable Haemophilus influenzae-induced inflammation by suppressing NF-kB signaling and NLRP3 inflammasome activation.

The respiratory pathogen nontypeable Haemophilus influenzae (NTHi) is the most common cause of exacerbation of chronic obstructive pulmonary disease (COPD), of which an excessive inflammatory response is a hallmark. With the limited success of current medicines there is an urgent need for the development of novel therapeutics that are both safe and effective. In this study, we explored the regulatory potential of pomegranate-derived peptides Pug-1, Pug-2, Pug-3, and Pug-4 on NTHi-induced inflammation. Our results clearly showed that to varying degrees the Pug peptides inhibited NTHi-induced production of IL-1β, a pivotal cytokine in COPD, and showed that these effects were not related to cytotoxicity. Pug-4 peptide exhibited the most potent inhibitory activity. This was demonstrated in all studied cell types including murine (RAW264.7) and human (differentiated THP-1) macrophages as well as human lung epithelial cells (A549). Substantial reduction by Pug-4 of TNF-α, NO and PGE2 in NTHi-infected A549 cells was also observed. In addition, Pug-4 strongly inhibited the expression of nuclear-NF-κB p65 protein and the NF-κB target genes (determined by IL-1β, TNF-α, iNOS and COX-2 mRNA expression) in NTHi-infected A549 cells. Pug-4 suppressed the expression of NLRP3 and pro-IL-1β proteins and inhibited NTHi-mediated cleavage of caspase-1 and mature IL-1β. These results demonstrated that Pug-4 inhibited NTHi-induced inflammation through the NF-κB signaling and NLRP3 inflammasome activation. Our findings herein highlight the significant anti-inflammatory activity of Pug-4, a newly identified peptide from pomegranate, against NTHi-induced inflammation. We therefore strongly suggest the potential of the Pug-4 peptide as an anti-inflammatory medicine candidate for treatment of NTHi-mediated inflammation.

Microbiological and metabolic pathways analysing the mechanisms of alfalfa polysaccharide and sulfated alfalfa polysaccharide in alleviating obesity

Alfalfa polysaccharide (AP) and sulfated alfalfa polysaccharide (SAP) exhibit potential for alleviating obesity. This study aimed to analyze the mechanism of action of AP and SAP in alleviating obesity through combined microbiomics and metabolomics. The research selected validated optimal AP and SAP concentration for experiment. The results showed that AP and SAP down-regulated colonic inflammatory gene expression, regulated intestinal pH to normal, and restored intestinal growth. Microbial sequencing showed that AP and SAP altered the microbial composition ratio. AP increased the relative abundance of Muribaculaceae and Romboutsia. SAP increased the relative abundance of Dubosiella, Fecalibaculum and Desulfovibrionaceae. Metabolomic analysis showed that AP regulated steroid hormone biosynthesis, neuroactive ligand-receptor interactions and bile secretion pathways. SAP focuses more on pathways related to amino acid metabolism. Meanwhile, AP and SAP down-regulated the mRNA expression of colonic COX-2, PepT-1 and HK2 and up-regulated the mRNA expression of TPH1. Correlation analysis showed a strong correlation between metabolites and gut bacteria. Dubosiella, Faecalibaculum may be the critical marker flora for polysaccharides to alleviate obesity. This study indicates that AP and SAP alleviate obesity through different pathways and that specific polysaccharide modifications affect characteristic microbial and metabolic pathways, providing new insights into polysaccharide modifications.

Interference in Macrophage Balance (M1/M2): The Mechanism of Action Responsible for the Anti-Inflammatory Effect of a Fluorophenyl-Substituted Imidazole.

Traditionally, the treatment of inflammatory conditions has focused on the inhibition of inflammatory mediator production; however, many conditions are refractory to this classical approach. Recently, an alternative has been presented by researchers to solve this problem: The immunomodulation of cells closely related to inflammation. Hence, macrophages, a critical key in both innate and acquired immunity, have been presented as an alternative target for the development of new medicines. In this work, we tested the fluorophenyl-imidazole for its anti-inflammatory activity and possible immunomodulatory effect on RAW 264.7 macrophages. We also evaluated the anti-inflammatory effect of the compound, and the macrophage repolarization to M2 was confirmed by the ability of the compound to reduce the M1 markers TNF-α, IL-6, MCP-1, IL-12p70, IFN-γ, and TLR4, the high levels of p65 phosphorylated, iNOS and COX-2 mRNA expression, and the fact that the compound was not able to induce the production of M1 markers when used in macrophages without lipopolysaccharide (LPS) stimulation. Moreover, fluorophenyl-imidazole had the ability to increase the M2 markers IL-4, IL-13, CD206, apoptosis and phagocytosis levels, arginase-1, and FIZZ-1 mRNA expression before LPS stimulation. Similarly, it was also able to induce the production of these same M2 markers in macrophages without being induced with LPS. These results reinforce the affirmation that the fluorophenyl-imidazole has an important anti-inflammatory effect and demonstrates that this effect is due to immunomodulatory activity, having the ability to trigger a repolarization of macrophages from M1 to M2a. These facts suggest that this molecule could be used as an alternative scaffold for the development of a new medicine to treat inflammatory conditions, where the anti-inflammatory and proregenerative properties of M2a macrophages are desired.

In vitro immune-enhancing effects of Platycodon grandiflorum combined with Salvia plebeian via MAPK and NF-κB signaling in RAW264.7 cells.

The immune-enhancing activity of the combination of Platycodon grandiflorum and Salvia plebeian extracts (PGSP) was evaluated through macrophage activation using RAW264.7 cells. PGSP (250-1000 μg/mL) showed a higher release of NO in a dose-dependent manner. The results showed that PGSP could significantly stimulate the production of PGE2, COX-2, TNF-α, IL-1β, and IL-6 in RAW264.7 cells and promote iNOS, COX-2, TNF-α, IL-1β, IL-4, and IL-6 mRNA expression. Western blot analysis demonstrated that the protein expression of iNOS and COX-2 and the phosphorylation of ERK, JNK, p38, and NF-κB p65 were greatly increased in PGSP-treated cells. PGSP also promoted the phagocytic activity of RAW264.7 cells. All these results indicated that PGSP might activate macrophages through MAPK and NF-κB signaling pathways. Taken together, PGSP may be considered to have immune-enhancing activity and might be used as a potential immune-enhancing agent.