Immunoproteasomal Processing of IsoLG-Adducted Proteins Is Essential for Hypertension.

BACKGROUND: Hypertension is characterized by CD8+ (cluster differentiation 8) T cell activation and infiltration into peripheral tissues. CD8+ T cell activation requires proteasomal processing of antigenic proteins. It has become clear that isoLG (isolevuglandin)-adduced peptides are antigenic in hypertension; however, IsoLGs inhibit the constitutive proteasome. We hypothesized that immunoproteasomal processing of isoLG-adducts is essential for CD8+ T cell activation and inflammation in hypertension. METHODS: IsoLG adduct processing was studied in murine dendritic cells (DCs), endothelial cells (ECs), and B8 fibroblasts. The role of the proteasome and the immunoproteasome in Ang II (angiotensin II)-induced hypertension was studied in C57BL/6 mice treated with bortezomib or the immunoproteasome inhibitor PR-957 and by studying mice lacking 3 critical immunoproteasome subunits (triple knockout mouse). We also examined hypertension in mice lacking the critical immunoproteasome subunit LMP7 (large multifunctional peptidase 7) specifically in either DCs or ECs. RESULTS: We found that oxidant stress increases the presence of isoLG adducts within MHC-I (class I major histocompatibility complex), and immunoproteasome overexpression augments this. Pharmacological or genetic inhibition of the immunoproteasome attenuated hypertension and tissue inflammation. Conditional deletion of LMP7 in either DCs or ECs attenuated hypertension and vascular inflammation. Finally, we defined the role of the innate immune receptors STING (stimulator of interferon genes) and TLR7/8 (toll-like receptor 7/8) as drivers of LMP7 expression in ECs. CONCLUSIONS: These studies define a previously unknown role of the immunoproteasome in DCs and ECs in CD8+ T cell activation. The immunoproteasome in DCs and ECs is critical for isoLG-adduct presentation to CD8+ T cells, and in the endothelium, this guides homing and infiltration of T cells to specific tissues.

Myeloid-Specific JAK2 Contributes to Inflammation and Salt Sensitivity of Blood Pressure.

BACKGROUND: Salt sensitivity of blood pressure (SSBP), characterized by acute changes in blood pressure with changes in dietary sodium intake, is an independent risk factor for cardiovascular disease and mortality in people with and without hypertension. We previously found that elevated sodium concentration activates antigen-presenting cells (APCs), resulting in high blood pressure, but the mechanisms are unknown. Here, we hypothesized that APC-specific JAK2 (Janus kinase 2) through STAT3 (signal transducer and activator of transcription 3) and SMAD3 (small mothers against decapentaplegic homolog 3) contributes to SSBP. METHODS: We performed bulk or single-cell transcriptomic analyses following in vitro monocytes exposed to high salt and in vivo high sodium treatment in humans using a rigorous salt-loading/depletion protocol to phenotype SSBP. We also used a myeloid cell-specific CD11c+ JAK2 knockout mouse model and measured blood pressure with radiotelemetry after N-omega-nitro-L-arginine-methyl ester and a high salt diet treatment. We used flow cytometry for immunophenotyping and measuring cytokine levels. Fluorescence in situ hybridization and immunohistochemistry were performed to spatially visualize the kidney's immune cells and cytokine levels. Echocardiography was performed to assess cardiac function. RESULTS: We found that high salt treatment upregulates gene expression of the JAK/STAT/SMAD pathway while downregulating inhibitors of this pathway, such as suppression of cytokine signaling and cytokine-inducible SH2, in human monocytes. Expression of the JAK2 pathway genes mirrored changes in blood pressure after salt loading and depletion in salt-sensitive but not salt-resistant humans. Ablation of JAK2, specifically in CD11c+ APCs, attenuated salt-induced hypertension in mice with SSBP. Mechanistically, we found that SMAD3 acted downstream of JAK2 and STAT3, leading to increased production of highly reactive isolevuglandins and proinflammatory cytokine IL (interleukin)-6 in renal APCs, which activate T cells and increase production of IL-17A, IL-6, and TNF-α (tumor necrosis factor-alpha). CONCLUSIONS: Our findings reveal the APC JAK2 signaling pathway as a potential target for the diagnosis and treatment of SSBP in humans.

DC ENaC-Dependent Inflammasome Activation Contributes to Salt-Sensitive Hypertension.

BACKGROUND: Salt sensitivity of blood pressure is an independent predictor of cardiovascular morbidity and mortality. The exact mechanism by which salt intake increases blood pressure and cardiovascular risk is unknown. We previously found that sodium entry into antigen-presenting cells (APCs) via the amiloride-sensitive epithelial sodium channel EnaC (epithelial sodium channel) leads to the formation of IsoLGs (isolevuglandins) and release of proinflammatory cytokines to activate T cells and modulate salt-sensitive hypertension. In the current study, we hypothesized that ENaC-dependent entry of sodium into APCs activates the NLRP3 (NOD [nucleotide-binding and oligomerization domain]-like receptor family pyrin domain containing 3) inflammasome via IsoLG formation leading to salt-sensitive hypertension. METHODS: We performed RNA sequencing on human monocytes treated with elevated sodium in vitro and Cellular Indexing of Transcriptomes and Epitopes by Sequencing analysis of peripheral blood mononuclear cells from participants rigorously phenotyped for salt sensitivity of blood pressure using an established inpatient protocol. To determine mechanisms, we analyzed inflammasome activation in mouse models of deoxycorticosterone acetate salt-induced hypertension as well as salt-sensitive mice with ENaC inhibition or expression, IsoLG scavenging, and adoptive transfer of wild-type dendritic cells into NLRP3 deficient mice. RESULTS: We found that high levels of salt exposure upregulates the NLRP3 inflammasome, pyroptotic and apoptotic caspases, and IL (interleukin)-1ß transcription in human monocytes. Cellular Indexing of Transcriptomes and Epitopes by Sequencing revealed that components of the NLRP3 inflammasome and activation marker IL-1ß dynamically vary with changes in salt loading/depletion. Mechanistically, we found that sodium-induced activation of the NLRP3 inflammasome is ENaC and IsoLG dependent. NLRP3 deficient mice develop a blunted hypertensive response to elevated sodium, and this is restored by the adoptive transfer of NLRP3 replete APCs. CONCLUSIONS: These findings reveal a mechanistic link between ENaC, inflammation, and salt-sensitive hypertension involving NLRP3 inflammasome activation in APCs. APC activation via the NLRP3 inflammasome can serve as a potential diagnostic biomarker for salt sensitivity of blood pressure.

Complete autonomic blockade reveals nitric oxide contribution to blood pressure regulation in obese Black women.

PURPOSE: Hypertension is one of the major causes of cardiovascular morbidity and mortality in the USA and disproportionately affects Black women. Endothelial-derived nitric oxide (eNO) substantially regulates blood pressure in humans, and impaired NO-mediated vasodilation has been reported in the Black population. Previous studies using an NO synthase inhibitor, NG-monomethyl-L-arginine (L-NMMA) did not fully determine the NO contribution to blood pressure because of baroreflex buffering. Therefore, in the present study we used trimethaphan, a ganglionic blocker, to inhibit baroreflex buffering and study NO modulation of blood pressure in Black women during L-NMMA infusion. METHODS: L-NMMA at doses of 250 µg/kg per minute was infused in combination with trimethaphan at doses of 4 mg/min to eliminate baroreflex mechanisms. Heart rate (HR) was obtained with continuous electrocardiogram monitoring, and continuous blood pressure was measured with the volume clamp method. The increase in systolic blood pressure (SBP) during both infusions was used to estimate the contribution of NO to blood pressure. RESULTS: Ten Black (age range 30-50 years, body mass index [BMI] 30-45 kg/m2), and nine White women (age range 30-50 years, body mass index 30-45 kg/m2) were enrolled in this study. During autonomic blockade, there was no difference in the decrease in SBP between Black and White women (- 20 ± 16.45 vs. - 24 ± 15.49 mm Hg, respectively; P = 0.659). When autonomic blockade was combined with L-NMMA, Black women had a significant increase in SBP compared to White women (54 ± 13.62 vs. 39 ± 09.64 mm Hg, respectively; P = 0.022, respectively). CONCLUSION: Autonomic blood pressure regulation was similar between Black and White women. However, NO contribution to blood pressure was significantly greater in Black women compared to White women. REGISTRATION: ClinicalTrials.gov: NCT01122407.

Machine learning applications in studying mental health among immigrants and racial and ethnic minorities: an exploratory scoping review.

BACKGROUND: The use of machine learning (ML) in mental health (MH) research is increasing, especially as new, more complex data types become available to analyze. By examining the published literature, this review aims to explore the current applications of ML in MH research, with a particular focus on its use in studying diverse and vulnerable populations, including immigrants, refugees, migrants, and racial and ethnic minorities. METHODS: From October 2022 to March 2024, Google Scholar, EMBASE, and PubMed were queried. ML-related, MH-related, and population-of-focus search terms were strung together with Boolean operators. Backward reference searching was also conducted. Included peer-reviewed studies reported using a method or application of ML in an MH context and focused on the populations of interest. We did not have date cutoffs. Publications were excluded if they were narrative or did not exclusively focus on a minority population from the respective country. Data including study context, the focus of mental healthcare, sample, data type, type of ML algorithm used, and algorithm performance were extracted from each. RESULTS: Ultimately, 13 peer-reviewed publications were included. All the articles were published within the last 6 years, and over half of them studied populations within the US. Most reviewed studies used supervised learning to explain or predict MH outcomes. Some publications used up to 16 models to determine the best predictive power. Almost half of the included publications did not discuss their cross-validation method. CONCLUSIONS: The included studies provide proof-of-concept for the potential use of ML algorithms to address MH concerns in these special populations, few as they may be. Our review finds that the clinical application of these models for classifying and predicting MH disorders is still under development.

Extracorporeal Photopheresis in Dermatological Diseases.

Extracorporeal photopheresis (ECP) is an apheresis procedure that is conventionally used as a first-line treatment for cutaneous and leukemic subtypes of T-cell lymphoma, such as Sezary's syndrome and mycosis fungoides. Over the past three decades, its immunotherapeutic properties have been tested on a variety of autoimmune conditions, including many dermatologic diseases. There is ample evidence of ECP's ability to modify leukocytes and alter cytokine production for certain dermatologic diseases that have been refractory to first-line treatments, such as atopic dermatitis. However, the evidence on the efficacy of ECP for the treatment of these dermatologic diseases is unclear and/or lacks sufficient evidence. The purpose of this paper is to review the literature on the utilization and clinical efficacy of ECP in the treatment of several [autoimmune] dermatologic diseases and discuss its applications, guidelines, recommendations, and future implementation for dermatologic diseases.

Down-regulation of NF-κB signalling by methanolic extract of Viola odorata (L.) attenuated in vivo inflammatory and angiogenic responses.

Intractable inflammation plays a key role in the progression of autoimmune diseases such as rheumatoid arthritis. Oedema and angiogenesis are the hall marks of chronic inflammation. The current study was aimed to investigate the pharmacological effects of the methanolic extract of Viola odorata (Vo.Me) on inflammation induced oedema and angiogenesis, and to identify the active principles and explore the molecular mechanisms thereof. Various models of inflammation were utilized in rats, including carrageenan- and histamine-induced acute oedema, as well as chronic models of Complete Freund's Adjuvant (CFA)-induced arthritis and cotton pellet-induced granuloma. Anti-angiogenic activity was evaluated by CAM assay followed by quantification of phytoconstituents through HPLC. Effect of Vo.Me  treatment on the expression of various mediators (PGE-2 and NO) and genes (IL-1ß, TNF-α, NF-κB, and COX-2) were explored by qPCR and ELISA assays. HPLC analysis showed the presence of quercetin, chlorogenic acid, gallic acid, benzoic acid, m-coumaric acid, p-coumaric acid, synergic acid, caffeic acid, vanillic acid, sinapic acid, and cinnamic acid in Vo.Me. Significant dose-dependent inhibition of rats' paw oedema was observed in the Vo.Me administered groups (p < 0.05) in both acute and chronic inflammatory models. Moreover, at a dosage of 500 mg/kg, Vo.Me exhibited a comparable anti-inflammatory effect to indomethacin (p > 0.05). Additionally, Vo.Me demonstrated a remarkable anti-granulomatous activity. Histopathological findings demonstrated amelioration of inflammation in animal paws which were treated with Vo.Me and indomethacin. CAM assay also displayed significant inhibitory effect of Vo.Me on the blood vasculature growth. Vo.Me treatment also caused relatively less gastric irritation and hepatic damage as compared to indomethacin. At a molecular level, the down-regulation of NF-κB signalling  leading to the decreased activation of pro-inflammatory mediators (such as IL-1ß, TNF-α, and COX-2) and their downstream molecules including prostaglandin E-2 (PGE-2) and nitric oxide (NO), is suggested to be responsible for these diverse anti-inflammatory effects. These findings confirmed the promising anti-inflammatory and anti-angiogenic activities of Vo.Me, which warrant bench-to-bedside translational studies to assess its safety and suitability for clinical usage.

Transition metal-catalyzed reactivity of carbenes with boronic acid derivatives for arylation (alkylation) and beyond.

This comprehensive review article discussed the reactivity of carbenes with boronic acid derivatives for the one-pot synthesis of diarylmethanes, difluoromethylated arenes, aryl and alkyl boron compounds, arylacetic acid derivatives, furan derivatives, and many other compounds. We have summarized the arylation, vinylation, and alkylation of carbenes utilizing various transition metals, viz. palladium, rhodium, copper, and platinum, for the construction of carbon-carbon bonds, carbon-boron bonds, and beyond through the cross-coupling strategy. The reason for the increasing popularity of these novel methodologies is their application in the synthesis and late-stage functionalization of biologically active compounds and natural products. Notably, organoboron compounds are exemplified as versatile synthetic intermediates for constructing various bonds.

Attenuation of CFA-induced arthritis through regulation of inflammatory cytokines and antioxidant mechanisms by Solanum nigrum L. leaves extracts.

Solanum nigrum L. is a popular traditional medicine for various inflammatory conditions including rheumatism and joint pain. The current study aimed to evaluate the anti-arthritic mechanism of Solanum nigrum L. Four extracts were prepared using n-hexane, methanol, chloroform, and water. The anti-nociceptive and anti-inflammatory activity was carried out with 100, 200, and 300 mg/kg body wt. PO of each extract by the hot plate and carrageenan-induced paw oedema methods, respectively. The anti-arthritic study was performed with chloroform and aqueous extracts (300 mg/kg) in complete Freund's adjuvant (CFA)-induced arthritis. Paw size (mm), ankle joint diameter (mm), and latency time (sec) were recorded on day 0 and every 4th day till 28 days. The hematological, inflammatory, and oxidative biomarkers were estimated. Results showed that significant analgesia (p < 0.05) and reduction in paw inflammation were achieved with all extracts. The highest percent inhibition in Carrageenan-induced inflammation was achieved with 300 mg/kg of chloroform (72.19%) and aqueous (71.30%) extracts, respectively. In the CFA model, both extracts showed a significant reduction in paw size and ankle joint diameter (p < 0.05). The RT-qPCR analysis revealed the upregulation of interleukin-4 and interleukin-10, and down-expression of interleukin-1ß, interleukin-6, tumor necrosis factor-α, cycloxygenase-2, nuclear factor-κB, prostaglandin E synthase 2, and interferon-γ. A significant increase in superoxide dismutase, catalase, and glutathione levels was observed. Hence, it is concluded that Solanum nigrum L. leaf extracts regulate the expression of inflammatory markers and improve oxidative stress resulting in the attenuation of CFA-induced arthritis.

Cassia absus-mediated upregulation of IL-4, IL-10 and downregulation of IL-1ß, IL-6, TNF- α, NF-κB, IFN-γ in CFA-induced arthritis model.

Traditional use of Cassia absus as an anti-inflammatory in conjunctivitis and bronchitis is well reported. Owing to its anti-inflammatory potential, the current study appraised in vivo anti-arthritic activity of n-hexane and aqueous extracts of Cassia absus seeds (200 mg/kg) using Complete Freund's Adjuvant (CFA) rat model of arthritis. Changes in paw size (mm), joint diameter (mm), and pain response (sec) were recorded at the baseline and then after CFA induction at the interval of 4 days till the 28th day. Blood samples of anesthetized rats were collected for the estimation of hematological, oxidative, and inflammatory biomarkers. Results showed percent inhibition in paw edema (45.09% and 60.79%) with both n-hexane and aqueous extracts, respectively. Significant reduction in paw size and ankle joint diameter (P < 0.01) was seen in extracts treated rats. Erythrocyte Sedimentation rate, C-Reactive Protein, White Blood Cell levels significantly lowered, and Hemoglobin, Platelets and Red Blood Cell count significantly increased post-treatments. Superoxide Dismutase, Catalase, and Glutathione were significantly improved (P < 0.0001) in treated groups as compared to CFA induced arthritic control. Real-time polymerase chain reaction investigation showed significant downregulation (P < 0.05) of Interleukin-1ß, Tumor Necrosis Factor-α, Interleukin-6, Cycloxygenase-2, Nuclear Factor-κB, Prostaglandin E Synthase 2, Interferon Gamma and upregulation of Interleukin-4, Interleukin-10 in both n-hexane and aqueous extract-treated groups. It is thereby concluded that Cassia absus can significantly attenuate CFA-induced arthritis by modulation of oxidative and inflammatory biomarkers.

Anti-inflammatory mechanisms of eucalyptol rich Eucalyptus globulus essential oil alone and in combination with flurbiprofen.

Inflammation is the core contributor in the pathogenesis of various acute and chronic illness including appendicitis, bronchitis, arthritis, cancer and neurological diseases. NSAIDs, commonly used medications for inflammatory diseases, on prolonged use cause GI bleeding, ulcers and many more issues. Plant-based therapeutic agents including essential oils in combination with low-dose synthetic drugs have been shown to produce synergistic effects and reduce complications of synthetic drugs. This study was designed to evaluate the anti-inflammatory, analgesic and anti-pyretic properties of Eucalyptus globulus essential oil alone and in combination with flurbiprofen. GC-MS analysis was performed to screen chemical composition of oil. In vitro anti-inflammatory assay (membrane stabilization assay) and in vivo inflammatory acute (carrageenan and histamine-induced paw oedema) and chronic (cotton pellet-induced granuloma and Complete Freund's adjuvant-induced arthritis) models were performed to check anti-inflammatory properties. Acetic acid-induced algesia and yeast-induced pyrexia models were performed to check analgesic and anti-pyretic properties. qRT-PCR was performed to study the effect of treatments on the expression of inflammatory biomarkers. GC-MS analysis of E. globulus essential oil showed the presence of eucalyptol along with other active biomolecules. 500 + 10 mg/kg of oil-drug combination showed significantly (p < 0.05) better in vitro membrane stabilization effects as compared with groups treated with 500 mg/kg of E. globulus oil and 10 mg/kg of Flurbiprofen alone. 500 + 10 mg/kg of oil-drug combination showed significantly (p < 0.05) better anti-inflammatory, analgesic and antipyretic effects as compared to 500 mg/kg of E. globulus oil alone in all in vivo models. When comparison was done between 500 + 10 mg/kg of oil-drug combination-treated and 10 mg/kg Flurbiprofen-treated group, the former group showed significantly (p < 0.05) better anti-inflammatory and anti-pyretic effects, but there were non-significant differences in the analgesic model. Animal group treated with 10 mg/kg of Flurbiprofen showed significantly (p < 0.05) better anti-inflammatory and analgesic effects than group treated with 500 mg/kg of oil alone while, there were non-significant differences in anti-pyretic effects. qRT-PCR analysis showed significant (p < 0.05) down-regulation in the expression of IL-4 and TNF-α in serum samples of animals treated with 500 + 10 mg/kg of oil-drug combination as compared to the diseased control (arthritic) group. Overall, the current research demonstrates that Eucalyptus globulus essential oil in combination with flurbiprofen showed better anti-inflammatory, analgesic and anti-pyretic effects than oil and flurbiprofen alone which is attributed to the down-regulation of pro-inflammatory biomarkers (IL-4 and TNF-α). Further studies are required to formulate a stable dosage form and to check the anti-inflammatory efficacy in different inflammatory disorders.

Sox6, A Potential Target for MicroRNAs in Cardiometabolic Disease.

PURPOSE OF REVIEW: The study aims to review recent advances in knowledge on the interplay between miRNAs and the sex-determining Region Y (SRY)-related high-mobility-group box 6 (Sox6) in physiology and pathophysiology, highlighting an important role in autoimmune and cardiometabolic conditions. RECENT FINDINGS: The transcription factor Sox6 is an important member of the SoxD family and plays an indispensable role in adult tissue homeostasis, regeneration, and physiology. Abnormal expression of the Sox6 gene has been implicated in several disease conditions including diabetes, cardiomyopathy, autoimmune diseases, and hypertension. Expression of Sox6 is regulated by miRNAs, which are RNAs of about 22 nucleotides, and have also been implicated in several pathophysiological conditions where Sox6 plays a role. Regulation of Sox6 by miRNAs is important in diverse physiological tissues and organs. Dysregulation of the interplay between miRNAs and Sox6 is an important determinant of various disease conditions and may be actionable for therapeutic purposes.

Chemical synthesis, biological activities and action on nuclear receptors of 20S(OH)D3, 20S,25(OH)2D3, 20S,23S(OH)2D3 and 20S,23R(OH)2D3.

New and more efficient routes of chemical synthesis of vitamin D3 (D3) hydroxy (OH) metabolites, including 20S(OH)D3, 20S,23S(OH)2D3 and 20S,25(OH)2D3, that are endogenously produced in the human body by CYP11A1, and of 20S,23R(OH)2D3 were established. The biological evaluation showed that these compounds exhibited similar properties to each other regarding inhibition of cell proliferation and induction of cell differentiation but with subtle and quantitative differences. They showed both overlapping and differential effects on T-cell immune activity. They also showed similar interactions with nuclear receptors with all secosteroids activating vitamin D, liver X, retinoic acid orphan and aryl hydrocarbon receptors in functional assays and also as indicated by molecular modeling. They functioned as substrates for CYP27B1 with enzymatic activity being the highest towards 20S,25(OH)2D3 and the lowest towards 20S(OH)D3. In conclusion, defining new routes for large scale synthesis of endogenously produced D3-hydroxy derivatives by pathways initiated by CYP11A1 opens an exciting era to analyze their common and differential activities in vivo, particularly on the immune system and inflammatory diseases.

Diospyros malabarica (Desr.) Kostel fruits extract attenuated acute and chronic inflammation through modulation of the expression of pro- and anti-inflammatory biomarkers in rat models.

Rheumatoid arthritis is a chronic inflammatory disorder of polyarticular tissues, characterised by progressive synovitis. Its prolonged treatment imparts a huge burden on the healthcare system and results in toxicity, which necessitates the search for safe, efficacious and cost-effective therapies. Diospyros malabarica (Desr.) Kostel is traditionally used for anti-inflammatory purposes; however, to the best of our knowledge, there is no detailed study reporting the in vivo anti-inflammatory potential of this plant. Therefore, in the current study, the methanol extract of D. malabarica (Desr.) Kostel fruit (mDMF) was evaluated for its antioxidant, anti-inflammatory and anti-arthritic potentials, along with its underlying mechanisms. The antioxidant activity was evaluated by DPPH assay. Total phenolic and flavonoid contents were estimated via colorimetric and high-performance liquid chromatography (HPLC) methods. Different doses (250, 500 and 750 mg/kg) of mDMF were used to evaluate the anti-inflammatory and anti-arthritis actions in acute inflammatory (carrageenan and histamine-induced paw oedema) and Freund's complete adjuvant (FCA)-induced arthritis rat models. Levels of various pro- and anti-inflammatory biomarkers were estimated using ELISA and RT-PCR techniques. Paw samples were used for different histopathological and radiographic studies. Qualitative phytochemical and HPLC analyses indicated the presence of various polyphenolic compounds in mDMF, which exhibited marked antioxidant activity in the DPPH assay. mDMF showed time-dependent anti-inflammatory and anti-arthritic effects in in vivo models. ELISA assay data showed significant (p < 0.05) reduction in the serum levels of C-reactive protein and rheumatoid factor in the mDMF treatment groups. RT-PCR data showed significant (p < 0.05) down-regulation of various pro-inflammatory markers (TNF-α, NF-κB, COX-2, IL-1ß and IL-6) and up-regulation of anti-inflammatory markers (IκB, IL-4 and IL-10) in serum samples of rats treated with mDMF. The histopathology of the ankle joints showed reduced pannus formation, joint swelling and synovial hyperplasia in mDMF-treated animals when compared with the untreated disease control group. Overall, it may be concluded that the antioxidant, anti-inflammatory and anti-arthritis properties of mDMF are due to its flavonoid and phenolic constituents. Further studies using a stable oral dosage form of D. malabarica (Desr.) Kostel fruits extract are warranted to explore its effects in other inflammatory disorders, including irritable bowel syndrome, appendicitis and hepatitis.

Anti-arthritic, anti-nociceptive and anti-inflammatory potential of Cassia absus: An ethanomedicinal plant of Febaceae family.

Medicinal plants are becoming popular choice for treatment of chronic disease conditions. Cassia absus plant parts have been traditionally used to treat inflammatory conditions. This study was designed for evaluating anti-arthritic, anti-nociceptive and anti-inflammatory potential of Cassia absus seeds. n- hexane, methanol, chloroform and aqueous extracts were prepared to be appraised for identification and quantitative determination of various phytochemicals. All the extracts were evaluated for anti-arthritic activity via protein denaturation, anti-nociceptive activity by hot plate method and anti-inflammatory potential through Carrageenan induced paw edema. Three doses; 100, 200 and 300mg/kg of each extract were given to Wistar rats. The results of the quantitative analysis revealed that Aqueous and n-hexane extracts contained the highest total flavonoid (104.2±0.24mg QE/g) and phenolic contents (187.4±0.65mg GA/g) respectively. All the extracts exhibited decrease in protein denaturation (n-hexane 66.66%, methanol 59.42%, chloroform 65.21% and aqueous extract 89.85%). Significant increase in mean latency time (secs) was observed in n-hexane, methanol and aqueous extract treated rats as compared to normal rats. All four extracts caused significant reduction in paw inflammation as compared to carrageenan control. It is therefore concluded that all the extracts of Cassia absus possessed significant anti-arthritic, anti-nociceptive and anti-inflammatory potential.

Asphodelus tenuifolius extracts arrested inflammation and arthritis through modulation of TNF-α, NF-κB, ILs, and COX-2 activities in in vivo models.

Asphodelus tenuifolius is traditionally used in the management of rheumatic pain and inflamed body parts. The current study validated its traditional use as an anti-arthritic and anti-inflammatory agent using a series of in vivo models. Carrageenan and histamine-induced acute oedema models were employed to study the effects of n-hexane (n-HeAT) and ethanolic (EeAT) extracts on acute inflammatory mediators and were found to inhibit oedema formation in a dose-dependent manner. Formalin and complete Freund's adjuvant (CFA) were injected into the hind paw of rats for the induction of arthritis. In the formalin model both n-HeAT and EeAT showed significantly better (p < 0.05) anti-oedema effects from day 6 onward. In CFA model rats were treated on 8th day of induction with extracts at the doses of 250, 500, and 750 mg/kg respectively. Piroxicam (10 mg/kg) and normal saline (10 mL/kg) were used as positive and negative controls respectively. Both n-HeAT and EeAT significantly (p < 0.05) decreased arthritis development in a time-dependent manner and at 28th day extent of inflammation was even less than that observed at day 8. The arthritic score was measured at day 12, 16, 20, 24, and 28 and was observed to be significantly less (p < 0.05) in animals treated with 750 mg/kg of n-HeAT and EeAT, respectively. Joint inflammation (p < 0.01), bone erosion (p < 0.001) and, pannus formation (p < 0.01) were significantly declined in A. tenuifolius treatment groups. Radiographic evaluations (X-ray) were conducted to check bone integrity and extent of inflammation and were observed to be diminished at day 28 in A. tenuifolius extracts treated groups. HPLC was performed to screen the phytochemical profile of n-HeAT and EeAT and were found to contain flavonoids and phenolic compounds. Quantitative real-time polymerase chain reaction (qPCR) was performed to detect effects of n-HeAT and EeAT treatments on inflammatory markers i.e., IL-4, IL-6, IL-10, COX-2, NF-κB, and I-κB using blood samples. ELISA assays were performed for the detection of levels of C-reactive proteins, respectively. Significant downregulation of TNF-α, IL-4, IL-6, IL-1ß, COX-2, NF-κB with simultaneous upregulation of IL-10 and I-κB was observed in n-HeAT and EeAT treatment groups. ELISA assays also showed significant (p < 0.05) down-modulation in the serum levels of CRP and TNF-α. Both extracts showed relatively weak antioxidant activities as compared with ascorbic acid in in vitro assay. Based on findings of the current study it is concluded that A. tenuifolius has anti-inflammatory and anti-arthritic effects and thus has potential to be used as an adjunct to standard NSAIDs therapy.Graphic abstract.

Investigation of in vivo anti-inflammatory and anti-angiogenic attributes of coumarin-rich ethanolic extract of Melilotus indicus.

Inflammation and angiogenesis are two major contributors to tumourigenesis. Melilotus indicus is traditionally used as an anti-inflammatory agent. The current study was designed to investigate the anti-inflammatory and anti-angiogenic properties of ethanolic extract of M. indicus (Miet) whole plant and its marker compound (coumarin) using a series of in vivo methods. Extraction by maceration was adopted to prepare ethanolic extract. Phytochemical compounds present in Miet were investigated using both qualitative and quantitative methods. In vivo safety profile of Miet was investigated in behavioural studies. Four acute oedema models such as carrageenan, serotonin, histamine-induced paw oedema and xylene-induced ear oedema, and chronic formaldehyde-induced paw oedema model were employed to explore the anti-inflammatory potential of Miet. Chorioallantoic chick membrane assay (CAM) was performed to explore anti-angiogenic potential of Miet. Histopathological evaluations were conducted to access improvement in skin texture of paws. TNF-α ELISA kit was used to study effects of treatment on serum levels of TNF-α. Extraction by maceration resulted in formation of greenish coloured semisolid extract with a high coumarin content. In vivo toxicological studies revealed LD50 of Miet was greater than 8000 mg/kg. Data of acute inflammatory models depicted significant (p < 0.05) inhibition of oedema in Miet, coumarin and standard (piroxicam/indomethacin) treated groups. 750 mg/kg of Miet induced comparable (p > 0.05) anti-inflammatory effects to that of standard-treated groups. Coumarin showed better anti-inflammatory effects in carrageenan-induced paw oedema model as compared with histamine- and serotonin-induced oedema models. Data of chronic inflammatory models also depicted dose-dependent anti-inflammatory attributes of Miet which were comparable with standard treated groups. Significant (p > 0.05) downregulation of TNF-α in serum samples of animals treated with Miet and piroxicam was observed as compared with control group. Furthermore, Miet significantly halted blood vessels formation in CAM assay. Overall, data of the current study highlight that M. indicus has anti-inflammatory and anti-angiogenic potentials, and, thus, can potentially be used as an adjuvant therapy in solid tumours management.

Protective effect of Heliotropium strigosum 70% aqueous methanolic extract against paracetamol induced hepatotoxicity in mice.

The study was carried out to evaluate the hepatoprotective potential of aqueous methanolic extract of Heliotropium strigosum (HSME) against paracetamol induced hepatotoxicity in Swiss albino mice. The plant powder (1.5Kg) was macerated in aqueous methanol (30:70) for 7 days. The extract was evaluated for the presence of different phytochemicals and High-performance liquid chromatography (HPLC) analysis. HSME was orally administered to mice at 125, 250 and 500mg/kg for 8 days followed by paracetamol intoxication (500mg/kg orally) on the 8th day using silymarin as standard control. All the therapy was administered by oral gavage. The liver biochemical parameters and histopathological evaluation were carried out to assess changes in liver function and histology. HPLC analysis confirmed the presence of quercetin, kaempferol, and other phenolic compounds. Treatment with the extract resulted in notable (p<0.05) reduction in liver parameters in dose dependent manner. The action of HSME 500mg/kg dose was comparable to silymarin. The effect of HSME against paracetamol induced hepatotoxicity was demonstrated by protective changes in the liver histopathological which proved the traditional uses of the plant.

Pharmacological, Phytochemical and histopathological basis of Conyza bonariensis in the potential management of diabetes mellitus.

To evaluate the anti-diabetic potential of aqueous methanolic extract of Conyza bonariensis amongst the Wistar rats. Phytochemical and High Performance Liquid Chromatography (HPLC) analyses of phenols and flavonoids were examined. The plant extract (250 and 500mg/kg/day) was explored for its anti-hyperglycemic effect for 14 days in normoglycemic and alloxan-induced diabetic rats using the oral glucose tolerance test (OGTT). HPLC analyses demonstrated the composition of the plant extract as gallic acid, cinnamic acid, quercetin, p-coumaric acid and syringic acid. The blood glucose concentrations in experimental diabetic as well as non-diabetic rats significantly decreased with doses 250 and 500 mg/kg in OGTT. Moreover, the significant drop in fasting glucose level was observed following 14 days of therapy. It also ameliorated the serum cholesterol, total protein, low and high density lipoproteins, glycosylated hemoglobin A1C and serum amylase with respect to untreated rats suffering from diabetes. There appeared to be no significant alteration with regard to body weight amongst the treated rats. The plant extract revamped the pancreatic islets of Langerhans and abridged alloxan-induced degenerative changes in the liver. It can be concluded that Conyza bonariensis extract has a pronounced hypoglycemic effect on diabetes due to the presence of phytochemicals.

Sox6 as a new modulator of renin expression in the kidney.

Juxtaglomerular (JG) cells, major sources of renin, differentiate from metanephric mesenchymal cells that give rise to JG cells or a subset of smooth muscle cells of the renal afferent arteriole. During periods of dehydration and salt deprivation, renal mesenchymal stromal cells (MSCs) differentiate from JG cells. JG cells undergo expansion and smooth muscle cells redifferentiate to express renin along the afferent arteriole. Gene expression profiling comparing resident renal MSCs with JG cells indicates that the transcription factor Sox6 is highly expressed in JG cells in the adult kidney. In vitro, loss of Sox6 expression reduces differentiation of renal MSCs to renin-producing cells. In vivo, Sox6 expression is upregulated after a low-Na+ diet and furosemide. Importantly, knockout of Sox6 in Ren1d+ cells halts the increase in renin-expressing cells normally seen during a low-Na+ diet and furosemide as well as the typical increase in renin. Furthermore, Sox6 ablation in renin-expressing cells halts the recruitment of smooth muscle cells along the afferent arteriole, which normally express renin under these conditions. These results support a previously undefined role for Sox6 in renin expression.