Flavonoid-rich extract of Chromolaena odorata modulate circulating GLP-1 in Wistar rats: computational evaluation of TGR5 involvement

Apigenin Regulates Bisphenol-A Induced Polycystic Ovarian Syndrome (PCOS) Symptoms In-Vivo Zebrafish

Bisphenol A (BPA) is an environmental pollutant known to induce oxidative stress and reproductive toxicity, symptoms that are commonly associated with Polycystic Ovary Syndrome (PCOS). This study investigates the potential protective effects of Apigenin (AGN), a bioactive flavonoid, against BPA-induced PCOS-like symptoms in adult zebrafish. The research aims to explore the therapeutic potential of natural compounds in mitigating the effects of environmental endocrine disruptors. Zebrafish were exposed to BPA at a concentration of 10 µg/L, a level known to adversely affect aquatic organisms. The non-toxicity and efficacy of AGN were assessed through a dose-response study involving concentrations of 5, 10, 15, and 20 µM. The experimental design was informed by computational molecular dynamics, including docking and simulations targeting the human androgen receptor. The study involved histological staining of ovarian tissues, biochemical assays for antioxidant enzyme activities, high-performance liquid chromatography (HPLC) for BPA accumulation, and gene expression analysis targeting PCOS-susceptible genes. AGN treatment significantly modulated antioxidant defenses in zebrafish, restoring activities of enzymes such as superoxide dismutase (SOD) and catalase (CAT), and reducing lactate dehydrogenase (LDH) levels. Histologically, AGN mitigated follicular damage and prevented excessive collagen deposition and ovarian hypertrophy, with the gonadosomatic index (GSI) approaching control levels. HPLC analysis confirmed lower BPA accumulation in tissues of AGN-treated groups. Additionally, gene expression studies showed downregulation of PCOS-related genes and TNF-α. AGN exerts a protective role against BPA-induced reproductive toxicity and offers potential as a natural intervention for both ecological and reproductive health challenges.

TGR5 Activation by Dietary Bioactives and Related Improvement in Mitochondrial Function for Alleviating Diabetes and Associated Complications

Takeda G protein-coupled receptor 5 (TGR5), also known as G protein-coupled bile acid receptor 1 (GPBAR1), is a cell surface receptor involved in key physiological processes, including glucose homeostasis and energy metabolism. Recent research has focused on the role of TGR5 activation in preventing or treating diabetes while also highlighting its potential impact on the progression of diabetic complications. Functional foods and edible plants have emerged as valuable sources of natural compounds that can activate TGR5, offering potential therapeutic benefits for diabetes management. Despite growing interest, studies on the activation of TGR5 by dietary bioactive compounds remain scattered. This Review aims to provide a comprehensive analysis of how dietary bioactives act as potential agents for TGR5 activation in managing diabetes and its complications. It explores the mechanisms of TGR5 activation through both direct agonistic effects and indirect pathways via modulation of the gut microbiota and bile acid metabolism.

Recent advancements in the structural exploration of TGR5 agonists for diabetes treatment

TGR5, a receptor that interacts with bile acids on cell surfaces, has become a promising therapeutic target for type II diabetes due to its ability to regulate energy expenditure and blood sugar levels. While several TGR5 agonists have been identified, only a few are currently in clinical trials. This article reviews the promising TGR5 agonists discovered in recent years, highlighting the chemical structure and pharmacological profile of the most effective compounds. With the limited number of effective drugs available for treating type II diabetes, the search for a potent TGR5 agonist with high efficacy and fewer side effects continues. The goal of this article is to provide an overview of the latest advancements in TGR5 agonists and offer insights for the future development of novel, potent TGR5 agonists for diabetes treatment. A noteworthy aspect addressed in the discussion is the common side effect associated with TGR5 agonist treatment - gallbladder filling. The review also explores potential strategies to mitigate this side effect, with the goal of improving the overall safety and tolerability of TGR5-targeted therapies.

Mefloquine-curcumin combinations improve host mitochondrial respiration and decrease mitotoxic effects of mefloquine in Plasmodium berghei-infected mice

Plasmodium infection is a health challenge. Although, antiplasmodial drugs kill the parasites, information on the effects of infection and drugs on the expression of some genes is limited. Malaria was induced in two different studies using NK65 (chloroquine-susceptible, study 1), and ANKA (chloroquine-resistant, study 2) strains of Plasmodium berghei in 30 male Swiss mice (n = 5) in each study. Mice orally received 10 mL/kg distilled water, (infected control), Mefloquine (MF) (10 mg/kg), MF and Curcumin (CM) (25 mg/kg), MF and CM (50 mg/kg), CM (25 mg/kg) and CM (50 mg/kg). Five mice (un-infected) were used as the control. After treatment, total Ribonucleic acid (RNA) was isolated from liver and erythrocytes while Deoxyribonucleic acid (DNA)-free RNA were converted to cDNA. Polymerase Chain Reaction (PCR) amplification was performed and relative expressions of FIKK12, AQP3, P38 MAPK, NADH oxidoreductase, and cytochrome oxidase expressions were determined. Markers of glycolysis, toxicity and antioxidants were determined using ELISA assays. While the expression of FIKK12 was blunted by MF in the susceptible study, co-treatment with curcumin (25 mg/kg) yielded the same results in the chloroquine-resistant study. Similar results were obtained on AQP3 in both studies. Curcumin decreased P38 MAPK in both studies. Plasmodium infection decreased NADH oxidoreductase and cytochrome oxidase but mefloquine-curcumin restored the expression of these genes. While glycolysis and toxicity were inhibited, antioxidant systems improved in the treated groups. Curcumin is needed for effective therapeutic efficacy and prevention of toxicity. Plasmodium infection and treatment modulate the expressions of some genes in the host. Curcumin combination with mefloquine modulates the expression of some genes in the host.

Maternal diet supplemented with African walnuts enhances cortico-hippocampal gene expression and histomorphology in rat offspring

BACKGROUND

The brain is built up during pregnancy. How it functions afterwards depends on how the expectant mother's diet nourishes it. Walnuts contain significant quantities of polyunsaturated fatty acids (PUFAs) and bioactive phytochemicals, which enhance brain health and function even with advancing age. This study examined the effects of a walnut-enriched diet (WED) on corticohippocampal histoarchitecture and gene expression in rat offspring.

MATERIALS AND METHODS

Twenty-eight female adult Wistar rats (n= 7) averaging about 185 g in weight were used for this study. After mating, pregnant dams were split randomly into four groups: A (standard rat chow/control), B (WED from GD 0 - PND 21), C (WED from GD 0 - PND 1), D (WED from PND 1 - PND 21). Offspring of dams were sacrificed at adolescence (PND 35), with brain tissues of interest harvested for subsequent analyses.

RESULTS

We observed no significant correlates in litter size, body, and brain weights across the experimental groups. Histomorphology revealed no distortion in cellular layering and delineation of cells in the PFC and dentate gyrus of both control and WED groups. Nissl staining intensity was enhanced in the offspring of dams exposed to WED versus the control, indicating improved proteostasis. Upregulated mRNA expression of DNMT3a, H2Ax, OPA1, and BDNF was observed in cortical and hippocampal tissues of WEDexposed offspring compared with the control group.

CONCLUSION

A diet enriched with African walnuts during early development induced changes predictive of cognitive improvements and enhanced stress-response signalling, plasticity, and neural resilience in rat offspring.

The Potential of the Flavonoid Content of Ipomoea batatas L. as an Alternative Analog GLP-1 for Diabetes Type 2 Treatment-Systematic Review

Ipomoea batatas L. (IBL) has gained significant popularity as a complementary therapy or herbal medicine in the treatment of anti-diabetes. This review seeks to explore the mechanism by which flavonoid compounds derived from IBL exert their anti-diabetic effects through the activation of GLP-1. The review article refers to the PRISMA guidelines. In order to carry out the literature search, electronic databases such as Science Direct, Crossref, Scopus, and Pubmed were utilized. The search query was based on specific keywords, including Ipomoea batatas OR sweet potato AND anti-diabetic OR hypoglycemic. After searching the databases, we found 1055 articles, but only 32 met the criteria for further review. IBL contains various compounds, including phenolic acid, flavonols, flavanols, flavones, and anthocyanins, which exhibit activity against anti-diabetes. Flavonols, flavanols, and flavones belong to a group of flavonoids that possess the ability to form complexes with AlCl3 and Ca2+. The intracellular L cells effectively retain Ca2+, leading to the subsequent release of GLP-1. Flavonols, flavones, and flavone groups have been found to strongly interact with DPP-IV, which inhibits the degradation of GLP-1. The anti-diabetic activity of IBL is attributed to the mechanism that effectively increases the duration of GLP-1 in the systemic system, thereby prolonging its half-life.

Hepatoprotective potential of flavonoid-rich extracts from Gongronema latifolium benth leaf in type 2 diabetic rats via fetuin-A and tumor necrosis factor-alpha

BACKGROUND

This study assessed the hepatoprotective potential of flavonoid-rich extracts from Gongronema latifolium Benth on diabetes-induced type 2 rats via Fetuin-A and tumor necrosis factor-alpha (TnF-α).

METHODS

In a standard procedure, the flavonoid-rich extract was prepared. For experimental rats, streptozotocin was injected intraperitoneally (45 mg/kg body weight) to induce diabetes mellitus. Following this, rats were given 5% of glucose water for 24 h. Hence, the animals were randomly divided into five groups of ten rats each, consisting of non-diabetic rats, diabetic controls, diabetic rats treated with low and high doses of flavonoid rich-extracts from Gongronema latifolium leaf (FREGL) (13 and 26 mg/kg, respectively), and diabetic rats treated with 200 mg/kg of metformin glibenclamide orally for 3 weeks. Afterwards, the animals were sacrificed, blood and liver were harvested to evaluate different biochemical parameters, hepatic gene expressions and histological examinations.

RESULTS

The results revealed that FREGL (especially at the low dose) significantly (p < 0.05) reduced alanine transaminase (ALT), aspartate aminotransferase (AST) and alkaline phosphate (ALP) activities, lipid peroxidation level, as well as relative gene expressions of fetuin-A and TNF-α in diabetic rats. Furthermore, diabetic rats given various doses of FREGL showed an increase in antioxidant enzymes and hexokinase activity, as well as glucose transporters (GLUT 2 and GLUT 4), and glycogen levels. In addition, histoarchitecture of the liver of diabetic rats administered FREGL (especially at the low dose) was also ameliorated.

CONCLUSION

Hence, FREGL (particularly at a low dose) may play a substantial role in mitigating the hepatopathy complication associated with diabetes mellitus.

Effect of diet supplemented with African Star Apple Fruit Pulp on purinergic, cholinergic and monoaminergic enzymes, TNF-α expression and redox imbalance in the brain of hypertensive rats

OBJECTIVE

This study examined whether diet supplemented with African star apple fruit pulp (FP) can mitigate the effect of high blood pressure on brain neurochemicals, histopathology and expression of genes linked with neuroinflammation.

METHODS

Rats were administered with cyclosporine (25 mg/kg.bw) to induce hypertension and were fed with or without FP supplemented diet. Purinergic (Nucleoside triphosphate diphosphohydrolases [NTPdase] and adenosine deaminase [ADA]) cholinergic (acetylcholinesterase [AChE]) and monoaminergic (monoamine oxidase-B) enzymes were assessed in treated and untreated hypertensive rats' brains. Oxidative stress biomarkers (catalase, glutathione-S-transferase, thiols, reactive oxygen species [ROS] and malondialdehyde [MDA]), as well as AChE, tumour necrosis factor and receptor (TNF-α and TNF-α-R) expression, were also determined.

RESULTS

FP supplemented diet significantly reduced NTPdase and ADA activities and increased Na⁺/K+-ATPase activities in hypertensive rats' brains compared to the untreated group. Furthermore, FP reduced acetylcholinesterase and monoamine oxidase-B activities compared to the hypertensive group. Redox imbalance was observed in hypertensive rats with inhibition of antioxidant enzymes and high levels of ROS and MDA. However, FP supplemented diet improved antioxidant enzymes, reduced ROS and MDA production in the brain of hypertensive rats. High blood pressure also triggered upregulation of AChE, TNF-α and TNF-α-R while feeding with FP supplemented diet downregulated the genes.

CONCLUSION

This study demonstrates the neuroprotective role of FP supplemented diet against alterations in neurochemicals associated with Alzheimer's disease, oxidative stress-induced neuronal damage and expression of genes linked with neuroinflammation. Moreover, studies on animal behaviour and human subjects are required to confirm these beneficial effects.

Antidiabetic Activity of Elephant Grass (Cenchrus Purpureus (Schumach.) Morrone) via Activation of PI3K/AkT Signaling Pathway, Oxidative Stress Inhibition, and Apoptosis in Wistar Rats

Ethnopharmacological Relevance: The management of diabetes over the years has involved the use of herbal plants, which are now attracting interest. We assessed the antidiabetic properties of aqueous extract of C. purpureus shoots (AECPS) and the mechanism of action on pancreatic ß-cell dysfunction. Methods: This study was conducted using Thirty-six 36) male Wistar rats. The animals were divided into six equal groups (n = 6) and treatment was performed over 14 days. To induce diabetes in the rats, a single dose of 65 mg/kg body weight of alloxan was administered intraperitoneal along with 5% glucose. HPLC analysis was carried out to identified potential compounds in the extract. In vitro tests α-amylase, and α-glucosidase were analyzed. Body weight and fasting blood glucose (FBG) were measured. Biochemical parameters, such as serum insulin, liver glycogen, hexokinase, glucose-6-phosphate (G6P), fructose-1,6-bisphosphatase (F-1,6-BP), interleukin-6 (IL-6), tumor necrosis factor-alpha (TNF-α), and nuclear factor kappa B (NF-ĸB), were analyzed. Additionally, mRNA expressions of phosphatidylinositol 3-kinase/protein kinase B (PI3K/AKT), B-cell lymphoma 2 (Bcl-2), and proliferating cell nuclear antigen (PCNA) were each evaluated. Results: This in vitro study showed inhibitory potency of Cenchrus purpureus extract (AECPS) as compared with the positive controls. AECPS showed a gradual decrease in alloxan-induced increases in FBG, total cholesterol (TC), triglycerides (TG), low density lipoprotein (LDL-c), G6P, F-1,6-BP, malondialdehyde (MDA), IL-6, TNF-α, and NF-ĸB and increased alloxan-induced decreases in liver glycogen, hexokinase, and high density lipoprotein (HDL-c). The diabetic control group exhibited pancreatic dysfunction as evidenced by the reduction in serum insulin, homeostasis model assessment of ß-cell function (HOMA-β), expressions of PI3K/AKT, Bcl-2, and PCNA combined with an elevation in homeostatic model assessment of insulin resistance (HOMA-IR). High performance liquid chromatography (HPLC) revealed 3-O-rutinoside, ellagic acid, catechin, rutin, and kaempferol in AECPS. Conclusion: AECPS showed efficient ameliorative actions against alloxan-induced pancreatic dysfunction, oxidative stress suppression as well as, inflammation, and apoptosis via the activation of PI3K/AKT signaling pathways.

Antidiabetic activity of avocado seeds (Persea americana Mill.) in diabetic rats via activation of PI3K/AKT signaling pathway

The treatment of diabetes involves the use of herbal plants, attracting interest in their cost-effectiveness and efficacy. An aqueous extract of Persea americana seeds (AEPAS) was explored in this study as a possible therapeutic agent in rats with diabetes mellitus. The induction of diabetes in the rats was achieved by injecting 65 mg/kg body weight (BWt) of alloxan along with 5% glucose. This study was conducted using thirty-six (36) male Wistar rats. The animals were divided into 6 equal groups, (n = 6) and treated for 14 days. In vitro assays for total flavonoid, phenols, FRAP, DPPH, NO, α-amylase, and α-glucosidase, were performed. Biochemical indices fasting blood sugar (FBS), BWt, serum insulin, liver hexokinase, G6P, FBP, liver glycogen, IL-6, TNF-α, and NF-ĸB in the serum, were investigated as well as the mRNA expressions of PCNA, Bcl2, PI3K/Akt in the liver and pancreas. The in vitro analyses showed the potency of AEPAS against free radicals and its enzyme inhibitory potential as compared with the positive controls. AEPAS showed a marked decrease in alloxan-induced increases in FBG, TG, LDL-c, G6P, F-1, 6-BP, MDA, IL-6, TNF-α, and NF-ĸB and increased alloxan-induced decreases in liver glycogen, hexokinase, and HDL-c. The diabetic control group exhibited pancreatic dysfunction as evidenced by a reduction in serum insulin, HOMA-β, expressions of PI3K/AKT, Bcl-2, and PCNA combined with an elevation in HOMA-IR. The HPLC revealed luteolin and myricetin to be the phytochemicals that were present in the highest concentration in AEPAS. The outcome of this research showed that the administration of AEPAS can promote the activation of the PI3K/AkT pathway and the inhibition of β-cell death, which may be the primary mechanism by which AEPAS promotes insulin sensitivity and regulates glycolipid metabolism.

UPLC-PDA-ESI-QTOF-MS/MS fingerprint of purified flavonoid enriched fraction of Bryophyllum pinnatum; antioxidant properties, anticholinesterase activity and in silico studies

CONTEXT

Bryophyllum pinnatum (Lam.) Oken (Crassulaceae) is used traditionally to treat many ailments.

OBJECTIVES

This study characterizes the constituents of B. pinnatum flavonoid-rich fraction (BPFRF) and investigates their antioxidant and anticholinesterase activity using in vitro and in silico approaches.

MATERIALS AND METHODS

Methanol extract of B. pinnatum leaves was partitioned to yield the ethyl acetate fraction. BPFRF was isolated from the ethyl acetate fraction and purified. The constituent flavonoids were structurally characterized using UPLC-PDA-MS². Antioxidant activity (DPPH), Fe²⁺-induced lipid peroxidation (LP) and anticholinesterase activity (Ellman's method) of the BPFRF and standards (ascorbic acid and rivastigmine) across a concentration range of 3.125-100 μg/mL were evaluated in vitro for 4 months. Molecular docking was performed to give insight into the binding potentials of BPFRF constituents against acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE).

RESULTS

UPLC-PDA-MS² analysis of BPFRF identified carlinoside, quercetin (most dominant), luteolin, isorhamnetin, luteolin-7-glucoside. Carlinoside was first reported in this plant. BPFRF significantly inhibited DPPH radical (IC₅₀ = 7.382 ± 0.79 µg/mL) and LP (IC₅₀ = 7.182 ± 0.60 µg/mL) better than quercetin and ascorbic acid. Also, BPFRF exhibited potent inhibition against AChE and BuChE with IC₅₀ values of 22.283 ± 0.27 µg/mL and 33.437 ± 1.46 µg/mL, respectively compared to quercetin and rivastigmine. Docking studies revealed that luteolin-7-glucoside, carlinoside and quercetin interact effectively with crucial amino acid residues of AChE and BuChE through hydrogen bonds.

DISCUSSION AND CONCLUSIONS

BPFRF possesses an excellent natural source of cholinesterase inhibitor and antioxidant. The material could be further explored for the potential treatment of oxidative damage and cholinergic dysfunction in Alzheimer's disease.

Neuroprotective effect of Bryophyllum pinnatum flavonoids against aluminum chloride-induced neurotoxicity in rats

Toxic metals such as aluminum accumulation in the brain have been associated with the pathophysiology of several neurodegenerative disorders. Bryophyllum pinnatum leaves contain a vast array of polyphenols, particularly flavonoids, that may play a role in the prevention of toxic and degenerative effects in the brain. This study assessed the neuro-restorative potential of leaves of B. pinnatum enriched flavonoid fraction (BPFRF) in aluminum-induced neurotoxicity in rats. Neurotoxicity was induced in male Wistar rats by oral administration of 150 mg/kg body weight of aluminum chloride (AlCl₃) for 21 days. Rats were grouped into five (n = 6); Control (untreated), Rivastigmine group, AlCl₃ group and BPFRF group (50 and 100 mg/kg b.wt.) for 21 days. Neuronal changes in the hippocampus and cortex were biochemically and histologically evaluated. Expression patterns of acetylcholinesterase (AChE) mRNA were assessed using semi-quantitative reverse-transcription-polymerase chain reaction protocols. Molecular interactions of BPFRF compounds were investigated in silico. The results revealed that oral administration of BPFRF ameliorated oxidative imbalance by augmenting antioxidant systems and decreasing lipid peroxidation caused by AlCl₃. BPFRF administration also contributed to the down-regulation of AChE mRNA transcripts and improved histological features in the hippocampus and cortex. Molecular docking studies revealed strong molecular interactions between BPFRF compounds, catalase, superoxide dismutase and glutathione peroxidase Overall, these findings suggest the neuroprotective effect of Bryophyllum pinnatum against aluminum-induced neurotoxicity.

Modulatory effect of Artocarpus camansi on ILP-2, InR, and Imp-L2 genes of sucrose -induced diabetes mellitus in Drosophila melanogaster

Diabetes mellitus continues to be a menace, being one of the five major causes of death in the world. In this study, the common fruit fly, Drosophila melanogaster, a well-studied genetic model organism for understanding molecular mechanisms of human diseases, and Artocarpus camansi (breadnut), an underutilized fruit, was used. This study was aimed at investigating the antihyperglycemic potentials of Artocarpus camansi fruit in sucrose-induced diabetic Drosophila melanogaster. Phytochemical screening was carried out after the fruit has been pulverized and freeze-dried. Total phenol content and total flavonoid content were carried out in vitro on the aqueous extract of Artocarpus camansi, and the result obtained showed that its phenol content is low, and its flavonoid content increases at increasing concentrations. Alpha-amylase inhibitory activity was carried out in vivo on sucrose-induced diabetic Drosophila melanogaster tissue. Gene expression profiling of Insulin-like peptide-2 (ILP-2), Insulin-like receptor (InR) and Ecdysone inducible gene L2 (Imp-L2) was carried out on trizol homogenate of Drosophila melanogaster tissue. In this study, Drosophila melanogaster was divided into nine groups. Group1 served as the basal control as they were fed with normal basal diet, group II served as the negative control which were fed with basal diet and 0.5 mL sucrose/100 mL distilled water, group III served as the positive control which were fed with basal diet 0.5 mL sucrose/100 mL distilled water and metformin, groups IV and V which were fed with basal diet and 0.1 and 1% Artocarpus camansi respectively, groups VI and VII were fed with basal diet, sucrose and 0.1 and 1% Artocarpus camansi respectively, groups VIII and IX served the purpose of the synergistic effect which were fed with basal diet, sucrose, metformin and 0.1 and 1% Artocarpus camansi respectively. All the groups were left for seven days. The experiment was conducted for 3 months and the fruit fly meals were changed every 5 days. Gene expression profiling results showed that the dietary inclusion of fruit downregulated the expression of ILP-2 and InR and upregulated the expression of Imp-L2 when the diabetic group were compared with the normal control. The results suggest that Artocarpus camansi fruit could possess antihyperglycemic properties and its use as a nutraceutical in the alleviation of diabetes should be encouraged.

Plumbagin induces testicular damage via mitochondrial-dependent cell death

Different aspects of reproductive functions are regulated by mitochondrial-controlled events. This study investigated the effect of plumbagin (PL) on testicular mitochondria with a view to unravelling the mechanism of the antifertility potential of plumbagin in testis of healthy rats. Thirty-two male Wistar strain albino rats were randomly allocated into four groups of eight animals each. The control or healthy group received orally 0.1 % DMSO while animals in the remaining three groups received 2.5 mg PL/kg bdwt, 5.0 mg PL/kg bdwt and 10 mg PL/kg bdwt, respectively, for 14 days. In study two, twenty-four male Wistar rats were randomly divided into three (3) groups and were orally administered 0.1% DMSO (control), 30 and 100 mg/kg PL, respectively once daily for 72 h. Rat testis mitochondria were isolated using differential centrifugation. The mitochondrial Permeability Transition (mPT) pore, mitochondrial ATPase (mATPase) activity and mitochondrial lipid peroxidation were assessed spectrophotometrically. Expression of apoptotic proteins (p53, Bax, Bcl-2) and the release of cytochrome c were determined by immunochemical technique. Reproductive receptors (FSH, PR), the expression of aromatase, Testis Specific Kinase-1 {TESK-1} were quantified by RT-PCR. The various doses of plumbagin (2.5, 5.0 and 10 mg/kg bdwt) induced opening of the testicular mPT pore by 2, 5 and 8 folds, respectively, after 14 days of oral administration. These doses of plumbagin also caused enhancement of mATPase activity, elevated generation of mLPO as well as increases in the concentrations of caspases 9 and 3. Sperm analysis revealed that these doses of PL also caused significant decreases in sperm count and motility and increased sperm abnormalities compared to control. Interestingly, these effects were accompanied by dose-dependent expressions of the Bak, p53 and cytochrome c release. Conversely, the abundance of anti-apoptotic Bcl-2 protein decreased relative to control. The levels of transcripts of FSH and progesterone receptors as well as TESK-1 and aromatase decreased significantly relative to control. Furthermore, PL strongly inhibited p53-MDM2 compared to control. Altogether, these findings show that plumbagin damages testicular cells through the activation of mitochondrial pathway involving the p53 protein network.

Synthetic Food dyes cause testicular damage via up-regulation of pro-inflammatory cytokines and down-regulation of FSH-R and TESK-1 gene expression

Objective:

This study investigated the effects of Tartrazine and Erythrosine (T+E) on the reproductive hormones and expression of some pro-inflammatory cytokines and testicular genes in testis of male Wistar rats.

Methods:

25 male Wistar rats (150-180g) were divided into 5 groups (n=5). Group 1 received distilled water while groups 2, 3, 4 and 5 were treated with T+E (2.5mg/kg, 5mg/kg, 10mg/kg and 20mg/kg) for the period of 23 days. Toxicity studies of the combined dye were investigated by evaluating serum reproductive hormones [Follicle stimulating hormone (FSH), Luteinizing hormone (LH), Testosterone], gene expression and profiling, and testes histology.

Results:

male Wistar rats (150-180g) were divided into 5 groups (n=5). Group 1 received distilled water while groups 2, 3, 4 and 5 were treated with T+E (2.5mg/kg, 5mg/kg, 10mg/kg and 20mg/kg) for the period of 23 days. Toxicity studies of the combined dye were investigated by evaluating serum reproductive hormones [Follicle stimulating hormone (FSH), Luteinizing hormone (LH), Testosterone], gene expression and profiling, and testes histology.

Conclusions:

This present study reveals that the dyes could impair testicular function as evident in the up-regulation of pro-inflammatory cytokines and down-regulation of TESK-1 gene expression and architecture of the testes leading to Orchitis.

Medicinal Plants and Isolated Molecules Demonstrating Immunomodulation Activity as Potential Alternative Therapies for Viral Diseases Including COVID-19

Plants have been extensively studied since ancient times and numerous important chemical constituents with tremendous therapeutic potential are identified. Attacks of microorganisms including viruses and bacteria can be counteracted with an efficient immune system and therefore, stimulation of body's defense mechanism against infections has been proven to be an effective approach. Polysaccharides, terpenoids, flavonoids, alkaloids, glycosides, and lactones are the important phytochemicals, reported to be primarily responsible for immunomodulation activity of the plants. These phytochemicals may act as lead molecules for the development of safe and effective immunomodulators as potential remedies for the prevention and cure of viral diseases. Natural products are known to primarily modulate the immune system in nonspecific ways. A number of plant-based principles have been identified and isolated with potential immunomodulation activity which justify their use in traditional folklore medicine and can form the basis of further specified research. The aim of the current review is to describe and highlight the immunomodulation potential of certain plants along with their bioactive chemical constituents. Relevant literatures of recent years were searched from commonly employed scientific databases on the basis of their ethnopharmacological use. Most of the plants displaying considerable immunomodulation activity are summarized along with their possible mechanisms. These discussions shall hopefully elicit the attention of researchers and encourage further studies on these plant-based immunomodulation products as potential therapy for the management of infectious diseases, including viral ones such as COVID-19.

Ascorbic acid coadministration with artesunate–amodiaquine, up-regulated antioxidant enzymes gene expression in bone marrow cells and elicited biochemical changes in Plasmodium berghei-infected mice

One of the hallmarks of malaria infection is oxidative stress. This study was aimed at investigating the potential effects of coadministering a therapeutic dose of artesunate–amodiaquine (AS/AQ) with Vitamin C (Vit C) orally on some biochemical parameters and antioxidant enzymes gene expression in bone marrow cells of Plasmodium berghei-infected mice. Thirty male Swiss albino mice were divided into five groups of six mice each as follows: Basal control (not infected with P. berghei), Untreated (P. berghei-infected without treatment), Vit C, AS/AQ and AS/AQ + Vit C combination treated mice. Treatment was done twice daily for three consecutive days. Complete parasite clearance was observed on the second day of treatment in AS/AQ and AS/AQ + Vit C combination treated P. berghei-infected mice. Serum albumin and bilirubin levels were higher in the AS/AQ + Vit C combination treated P. berghei-infected mice compared with those treated with AS/AQ only. Artesunate–amodiaquine + Vit C combination increased superoxide dismutase activity and reduced hydrogen peroxide and malondialdehyde levels in P. berghei-infected mice when compared with the mice treated with only AS/AQ. Furthermore, AS/AQ + Vit C combination significantly up-regulated catalase and glutathione peroxidase-1 (GPx-1) mRNA expression compared with the mice treated with only AS/AQ. This is the first report linking AS/AQ to antioxidant enzyme gene expression in bone marrow cells. Our findings showed that AS/AQ and Vit C coadministration may be beneficial as it ameliorated oxidative stress and up-regulated antioxidant enzyme gene expression in P. berghei-infected mice.

Combine colorants of tartrazine and erythrosine induce kidney injury: involvement of TNF-α gene, caspase-9 and KIM-1 gene expression and kidney functions indices

Twenty-five male Wistar rats (140-170 g) were partitioned into 5 groups (n = 5). 2.5 mg/kg, 5 mg/kg, 10 mg/kg and 20 mg/kg of combine Tartrazine and Erythrosine (T+E; 50:50) were administered for 23 days. Serum urea and creatinine, gene expression and profiling of pro-inflammatory cytokine (Tumor Necrosis Factor- α gene), Caspase-9 and Kidney injury molecule-1 (KIM-1) and histomorphological examination of the kidney were investigated. The fold change of relative gene expression of TNF-α gene showed significantly (p < 0.05) up-regulation in all the treated rats except for the 10 mg/kg T+E treated rats when compared to control rats. Casp-9 and KIM-1 genes were significantly (p < 0.05) up-regulated in low dose treatment (2.5 mg/kg T+E and 5 mg/kg T+E) and down-regulated in high dose treatment (10 mg/kg T+E and 20 mg/kg T+E). However, there was significant (p < 0.05) increase in serum urea concentration in the rats treated with 5 mg/kg T+E and 20 mg/kg T+E while the rats treated with 10 mg/kg T+E indicated a significant (p < 0.05) decrease. Conversely, serum creatinine concentration indicated significant (p < 0.05) increase in10mg/kg T+E and 20 mg/kg T+E treated rats versus the control. From the histomorphological examination of the kidney, there was hypertrophy of the glomeruli in relation to the size of Bowman's capsule in the 10 mg/kg T+E and 20 mg/kg T+E treated rats. Kidney function was impaired as evident in up-regulation of TNF-α gene, KIM-1 gene, and serum urea and creatinine concentration with down-regulation of Casp-9 gene. The combined treatment also tampers with the architecture of the kidney.

Zingiber officinale Ethanolic Extract Attenuated Reserpine-Induced Depression-Like Condition and Associated Hippocampal Aberrations in Experimental Wistar Rats

BACKGROUND

Repeated and regimented treatment with reserpine causes depression-like condition characterized by persistent mood disorder, feelings of severe despondency and dejection, thus altering the hippocampal morphology. Our study compared a well-known antidepressant (fluoxetine), with the potential of Zingiber officinale to ameliorate reserpine-induced depression and the associated hippocampal cornu ammonis 1 (CA1) neuronal cell damage.

METHODS

Forty-eight male Wistar rats, weighing 130-160 g, were randomly assigned to 6 groups (n=8), housed in plastic cages under natural light and dark cycles at room temperature with access to feed and water ad libitum. Group-A (control) received distilled water. Group-B and Group-C orally received 400 mg/kg of Zingiber officinale and 10 mg/kg of fluoxetine, respectively, for 7 days, while Group-D intraperitoneally received 0.2 mg/kg of reserpine for 14 days. Group-E and Group-F intraperitoneally received 0.2 mg/kg of reserpine for 14 days followed by 400 mg/kg of Zingiber officinale and 10 mg/kg of fluoxetine respectively for 7 days. All animals were sacrificed by cervical dislocation at the end of experiment, and the brains hippocampi were dissected, excised and processed for various analyses including histology [H&E], histochemistry of GFAP expression by astrocytes and specific gene expressions including p53 gene, glutathione reductase (GSR), glutathione peroxidase and catalase (CAT).

RESULTS

Reserpine significantly depleted the expression of P53 and glutathione reductase (GSR) genes while significantly increasing the expression of glutathione peroxidase 1 (GPx-1) gene (P≤0.05). Also, a marked increase in the expression of catalase (CAT) gene was observed. Furthermore, histoarchitecture (photomicrographs) of hippocampus CA1 region showed disruption in the arrangement of pyramidal neurons and alterations in their morphologies when animals were treated with reserpine (Group D). There was also accompanying increased astrocyte densities within the CA1 region following reserpine treatment. These features indicated deleterious effects of reserpine. Both Zingiber officinale and fluoxetine treatments ameliorated these effects.

CONCLUSION

These findings showed structural and molecular alterations associated with reserpine-induced depression. Also, Zingiber officinale was effective to provide ameliorative and protective effects against the neurotoxic effects of reserpine in the hippocampus, making it a potential candidate for treating depression and its associated neurodegenerative diseases.

Chromolaena odorata flavonoids attenuate experimental nephropathy: Involvement of pro-inflammatory genes downregulation

Nephropathy is a serious complication comorbid with a number of life-threatening diseases such as diabetes. Flavonoids are well known cytoprotective phytochemicals. Here, nephropathy associated with streptozotocin (STZ) treatment in experimental animals was challenged by flavonoids (CoF) isolated from Chromolaena odorata. Experimental animals were divided into control (n = 5), STZ (40 mg/kg b.w. i.p. n = 5) and STZ-CoF (CoF = 30 mg/kg b.w. oral, 60 days, n = 7) groups. Blood urea nitrogen (BUN) and serum creatinine (SC) levels were quantified using ELISA. Kidney function, inflammatory marker, and antioxidant gene expression levels were also evaluated using reverse-transcription and polymerase chain reaction protocols. Histological assessment was also performed using Haematoxylin and Eosin (H&E) staining protocols. CoF improved kidney function by restoring BUN/SC levels to pre-STZ treatment states. KIM-1, TNF-α, and MCP-1 but not TNF-R and IL-10 genes were significantly downregulated in STZ-CoF treated group in comparison with STZ-treated group (p < 0.05). Anti-oxidant genes (GPx-1, CAT) significantly (p < 0.05 vs. control) upregulated in STZ-treatment did not respond to CoF treatment. STZ treatment associated Bowman's space enlargement, thickened basement membrane, and glomerulosclerosis were completely reversed in STZ-CoF group. Finally, CoF has demonstrable anti-nephropathic via downregulation of proinflammatory genes and may represent new management option in clinical nephropathy.

High resolution UPLC-PDA-QTOF-ESI-MS/MS analysis of the flavonoid-rich fraction of Lasianthera africana leaves, and in vivo evaluation of its renal and cardiac function effects

Lasianthera africana P. Beauv. (Icacinaceae) is a traditional Nigerian medicinal plant used for treatment of ulcers, diarrhea, parasitic infections and diabetes. This study was aimed at characterizing the bioactive principles extractable from the flavonoid-rich fraction of L. africana leaves (LAFRF), and to evaluate its effects on renal and cardiac functions. Isolation, and purification of the LAFRF was achieved using standard methods. The in vitro antioxidant activity was evaluated on DPPH∗ and ferric reducing antioxidant potential (FRAP). The total flavonoids (281.05 ± 7.44 mg QE/g), were identified, structurally characterized and quantified using high resolution ultra-performance liquid chromatography, in tandem with quadrupole-time-of-flight electrospray ionization mass spectrometer (UPLC-PDA-QTOF-ESI-MS/MS). Fifty Wistar rats of both sexes (110-130 g), were distributed into 10 groups (n = 5). Groups 1 and 2 served as the normal and CCl4 controls respectively. Groups 3A-6B constituted the preventive and curative studies. The effects of the LAFRF at 3, 10, and 30 mg/kg body weight on urea and creatinine concentrations, lactate dehydrogenase (LDH), and creatine kinase (CK) activities of CCl4-intoxicated rats were assessed. The LAFRF displayed remarkable in vitro antioxidant property by scavenging the DPPH∗, with an IC50 of 5.40 ± 0.00 μg/ml which is more potent than the scavenging activity of the ascorbic acid (IC50 of 7.18 ± 0.00 μg/ml), and also effectively reduced Fe3+ to Fe2+ when compared to gallic acid. The UPLC-PDA-QTOF-ESI-MS/MS fingerprint of the LAFRF indicated presence of quercetin (758983.6 mg/kg), rutin (17540.4 mg/kg), luteolin (126524.3 mg/kg), isorhamnetin (197949.0 mg/kg), and other non-phenolic compounds. The LAFRF significantly (p < 0.05) improved renal function, and normalized cardiac enzyme activities in vivo. The ability of the LAFRF to scavenge the DPPH and Fe3+ radicals, improve renal and cardiac functions following CCl4 intoxication shows its potential in the development of alternative therapy for combating oxidative stress-related complications.

Sub-acute toxicity study of methanol extract of Tetrorchidium didymostemon leaves using biochemical analyses and gene expression in Wistar rats

Tetrorchidium didymostemon is widely used by traditional medicine practitioners to manage and treat several diseases. Despite its known ethnomedicinal uses, there are no scientific studies on the toxic effects of this plant. This study was performed to evaluate the potential toxicity of methanol extracts Tetrorchidium didymostemon leaves through sub-acute oral administration in rats. Twenty four (24) male albino rats (Wistar strain) of average weight 150 ± 20 g were randomly divided into 4 groups of 6 rats each. Group 1 was the control while groups 2, 3 and 4 were administered 100, 300 and 600 mg/kg body weight of the plant extracts respectively for 14 consecutively days. The extract did not induce any treatment related changes in body weight, organ/body weight ratio, biochemical parameters (aspartate transaminase, alanine transaminase, total protein, albumin, creatinine and urea), oxidative stress indices (malondialdehyde, superoxide dismutase and reduced glutathione) and histopathology (liver and kidney) of the treated groups when compared to the control. However, at 600 mg/kg body weight dose, the extract caused a significant (p < 0.05) decrease in hemoglobin level, packed cell volume and the expression of albumin gene of rats. Similarly, at 300 and 600 mg/kg body weight, the extract also caused a non-significant (p > 0.05) decrease in red blood cell count. Furthermore, the extract at 100 and 300 mg/kg body weight induced a significant (p < 0.05) increase in the expression of tumor necrosis factor - alpha and kidney injury molecule - 1 (KIM-1) genes. Catalase gene expression especially in the kidney was up-regulated in the groups administered the extract. Our study suggests that oral administration of T. didymostemon leaves extract is relatively safe. However, there is need for caution due to the observed changes in hematological profile, up-regulation of KIM-1 genes as well as down regulation of albumin gene.

Potential use of bitter melon (Momordica charantia) derived compounds as antidiabetics: In silico and in vivo studies

Momordica charantia (bitter lemon) belongs to the cucurbitaceae family which has been extensively used in traditional medicines for the cure of various ailments such as cancer and diabetes. The underlying mechanism of M. charantia to maintain glycemic control was investigated. GLP-1 and DPP-4 gene modulation by M. charantia (5-20% inclusion in rats diet) was investigated in vivo by RT-PCR and possible compounds responsible for diabetic action predicted through in silico approach. Phytochemicalss previously characterized from M. charantia were docked into glucacon like peptide-1 receptor (GLP-1r), dipeptidyl peptidase (DPP4) and Takeda-G-protein-receptor-5 (TGR5) predicted using Autodock Vina. The results of the in silico suggests momordicosides D (ligand for TGR5), cucurbitacin (ligand for GLP-1r) and charantin (ligand for DPP-4) as the major antidiabetic compounds in bitter lemon leaf. M. charantia increased the expression of GLP-1 by about 295.7% with concomitant decreased in expression of DPP-4 by 87.2% with 20% inclusion in rat's diet. This study suggests that the mechanism underlying the action of these compounds is through activation of TGR5 and GLP-1 receptor with concurrent inhibition of DPP4. This study confirmed the use of this plant in diabetes management and the possible bioactive compounds responsible for its antidiabetic property are charantin, cucurbitacin and momordicoside D and all belong to the class of saponins.