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1.
Biochem Pharmacol ; 214: 115673, 2023 08.
Article in English | MEDLINE | ID: mdl-37414101

ABSTRACT

Ulcerative Colitis (UC) is a chronic idiopathic inflammatory bowel disease in which the colon's lining becomes inflamed. Exploring herbal remedies that can recover mucosal damage is becoming popular in UC. The study aims to investigate the probable colo-protective effect of a natural isoflavone, genistein (GEN), and/or a drug, sulfasalazine (SZ), against acetic acid (AA)-induced UC in rats, in addition to exploring the possible underlying mechanisms. UC was induced by the intrarectal installation of 1-2 ml of 5% diluted AA for 24 h. Ulcerated rats were allocated into the disease group and three treated groups, with SZ (100 mg/kg), GEN (100 mg/kg), and their combination for 14 days, besides the control groups. The anti-colitic efficacy of GEN and/or SZ was evidenced by hindering the AA-induced weight loss, colon edema, and macroscopic scores, besides reduced disease activity index and colon weight/length ratio. Furthermore, treatments attenuated the colon histopathological injury scores, increased the number of goblet cells, and lessened fibrosis. Both treatments reduced the up-regulation of INF-γ/JAK1/STAT1 and INF-γ /TLR-4/ NF-κB signaling pathways and modulated the IRF-1/iNOS/NO and IL-6/JAK2/STAT3/COX-2 pathways and consequently, reduced the levels of TNF-α and IL-1ß. Moreover, both treatments diminished oxidative stress, which appeared by reducing the MPO level and elevating the SOD activity, and hindered apoptosis; proved by the decreased immunohistochemical expression of caspase-3. The current findings offer novel insights into the protective effects of GEN and suggest a superior benefit of combining GEN with SZ, over either drug alone, in the UC management.


Subject(s)
Colitis, Ulcerative , Rats , Animals , Colitis, Ulcerative/chemically induced , Colitis, Ulcerative/drug therapy , Sulfasalazine/pharmacology , Sulfasalazine/therapeutic use , NF-kappa B/metabolism , Interleukin-6/metabolism , Cyclooxygenase 2/metabolism , Genistein/pharmacology , Toll-Like Receptor 4/metabolism , Acetic Acid/toxicity , Acetic Acid/metabolism , Colon
2.
Saudi Pharm J ; 30(1): 72-90, 2022 Jan.
Article in English | MEDLINE | ID: mdl-35145347

ABSTRACT

Excessive interleukin (IL)-6 production is a driver for malignancy and drug resistance in colorectal cancer (CRC). Our study investigated a seven-week post-treatment with the anti-inflammatory drug, Diacerein (Diac), alone or in combination with 5-fluorouracil (5-FU), using a 1,2-dimethylhydrazine (DMH) rat model of CRC. Diac alone and 5-FU+Diac reduced serum levels of carcino-embryonic antigen (CEA), while all regimens decreased serum levels of colon cancer-specific antigen (CCSA), a more specific CRC biomarker. Additionally, Diac, 5-FU and their combination suppressed colonic content/gene expression of IL-6, its downstream oncogene, Kirsten rat sarcoma viral oncogene homolog (K-Ras), and consequently Notch intracellular domain and nuclear factor-kappa B (NF-κB) p65. In turn, NF-κB downstream factors, viz., matrix metalloproteinase-9 (MMP-9), vascular endothelial growth factor (VEGF), c-Myc, and B-cell lymphoma-2 (Bcl-2) were also downregulated, while E-cadherin was elevated. Additionally, the drugs reduced the immunoreactivity of CD31 to prove their anti-angiogenic effect, while the TUNEL assay confirmed the apoptotic effect. The apoptotic effect was confirmed by transferase dUTP nick-end labeling assay. Moreover, these drugs inhibited colon content of p-Akt, ß-catenin, and cyclin D1 immunoreactivity. The drugs also activated the tumor suppressor glycogen synthase kinase 3- ß (GSK3-ß) and upregulated the expression of the Nur77 gene, which represents the second arm of IL-6 signaling. However, only 5-FU upregulated miR-200a, another K-Ras downstream factor. The in-vitro cytotoxic and migration/invasion assays verified the molecular trajectories. Accordingly, we evaluated the antineoplastic effect of Diac alone and its possible chemosensitization effect when added to 5-FU. This combination may target critical oncogenic pathways, including the IL-6/K-Ras/Notch/NF-κB p65 axis, p-Akt/GSK3-ß/ß-catenin/cyclin D-1 hub, and Nur77.

3.
Life Sci ; 239: 117047, 2019 Dec 15.
Article in English | MEDLINE | ID: mdl-31730865

ABSTRACT

Peroxisome proliferator-activated receptor γ (PPAR-γ) agonist, pioglitazone, is used clinically to improve the glycemic state in patients with type-2 diabetes mellitus. Independent of its blood glucose-lowering properties, pioglitazone ameliorates different cardiovascular disorders. The aim of the present study was to investigate the effect of pioglitazone on cardiovascular complications of N-nitro-L-arginine methyl ester (L-NAME)-induced hypertension and to determine the role of oxidative and endoplasmic reticulum (ER) stress in its activity. Nitric oxide (NO) deficiency induced by chronic L-NAME administration was associated with high blood pressure (BP) and cardiac hypertrophy. L-NAME induced oxidative stress as indicated by reduced glutathione (GSH) levels, superoxide dismutase (SOD) and catalase activities as well as increased malondialdehyde (MDA) levels. Furthermore, L-NAME increased the expression of ER stress markers, activating transcription factor-4 (ATF-4) and C/EPBα-homologous protein-10 (CHOP-10) in both heart and aorta of hypertensive rats. Activation of PPAR-γ by pioglitazone reduced BP, restored the blunted NO levels, increased endothelial NO synthase (eNOS) expression, and restored the antioxidant status of L-NAME-induced hypertensive rats. Moreover, the antihypertensive activity of pioglitazone was associated with a reduction in ER stress and this effect was PPAR-γ dependent. Interestingly, the effect of ER stress inhibitor, 4-phenylbutyric acid (4-PBA) and antioxidant, N-acetylcysteine (NAC), on BP, NO availability, oxidative stress and ER stress mimics the activity of pioglitazone. Taken together, our data suggests that PPAR-γ is a potential target to inhibit vascular complications and cardiac damage associated with NO-deficient HTN and puts more emphasis on the importance of ER stress in regulating PPAR-γ activity.


Subject(s)
Hypertension/drug therapy , PPAR gamma/metabolism , Pioglitazone/pharmacology , Animals , Antioxidants/pharmacology , Aorta/metabolism , Blood Pressure/drug effects , Catalase/metabolism , Endoplasmic Reticulum Stress/drug effects , Glutathione/metabolism , Heart/physiology , Hypertension/metabolism , Male , NG-Nitroarginine Methyl Ester/pharmacology , Nitric Oxide/metabolism , Nitric Oxide Synthase Type III/metabolism , Oxidation-Reduction , Oxidative Stress/drug effects , PPAR gamma/agonists , Pioglitazone/metabolism , Rats , Rats, Wistar , Superoxide Dismutase/metabolism
4.
Biomed Pharmacother ; 110: 500-509, 2019 Feb.
Article in English | MEDLINE | ID: mdl-30530230

ABSTRACT

AIM: Obesity is a continually growing pandemic leading to many diseases that affect the overall quality of life. The widely marketed Garcinia cambogia (GC) and Raspberry ketone (RK) were used in this study. Despite their known dietetic effect, however, the metabolomic/signaling pathways involved in this effect are not fully elucidated. Hence, our study comprehends the possible trajectories of their combination against obesity and insulin resistance in addition to exploring their combination merit. MATERIALS AND METHODS: Adult male Wistar rats were divided into 5 groups; viz., normal diet (ND), high fat fructose diet (HFFD), HFFD+GC (600mg/kg), HFFD+RK (55mg/kg) and HFFD+GC+RK. To assess our aim, we determined their effect on body weight, IPGTT, glucose homeostasis (glucose, insulin, HOMA IR), lipid profile parameters and SREBP-1c, oxidative stress markers, insulin and leptin signaling pathways (p-IRS-1/p-AKT/GLUT-4, and leptin/STAT-3), as well as liver and adipose tissue histopathology. RESULTS: GC/RK combinationcaused weight loss, corrected the disturbed glucose and insulin homeostasis, raised serum levels of HDL anddecreased all other lipid profile parameters. They also increased Nrf-2 expression, ad GSH, as well as p-IRS-1/p-Akt/GLUT-4 cue, while they decreased MDA, leptin/STAT-3 and SREBP-1c content compared to the HFFD group. Furthermore, the GC/RK combination abolished apoptosis, fatty changes and inflammation in hepatocytes and decreased sclerotic blood vessels and congestion in adipose tissue. CONCLUSION: Our study highlights the involvement ofp-IRS-1/p-Akt/GLUT-4, leptin/STAT-3 and SREBP-1c signaling trajectories in the beneficial combination of GC and RK, besides, the efficient rebalance of the redox status, insulin resistance and tissue fat deposition confirmed histopathologically.


Subject(s)
Butanones/therapeutic use , Diet, High-Fat/adverse effects , Fructose/adverse effects , Garcinia cambogia , Insulin Resistance/physiology , Leptin/metabolism , Obesity/metabolism , Adiposity/drug effects , Adiposity/physiology , Animals , Butanones/pharmacology , Leptin/antagonists & inhibitors , Male , Obesity/drug therapy , Obesity/etiology , Plant Extracts/isolation & purification , Plant Extracts/pharmacology , Plant Extracts/therapeutic use , Rats , Rats, Wistar , Signal Transduction/drug effects , Signal Transduction/physiology
5.
Neurol Res ; 40(4): 324-333, 2018 Apr.
Article in English | MEDLINE | ID: mdl-29464986

ABSTRACT

OBJECTIVES: Thymoquinone (TQ), the main active ingredient in Nigella sativa oil, exhibits various bioactivities. This study aimed to investigate the effect of TQ on neurobehavioral and neuropathological alterations induced by aluminum trichloride (AlCl3) and D-galactose (D-gal)-in male rats and to explore the related mechanisms. METHODS: D-gal (60 mg/kg day) and AlCl3 (10 mg/kg day) were given intraperitoneally (i.p.) once daily for 42 days and after 4 weeks TQ was concomitantly administered intragastrically (i.g.) (20 mg/kg/day) once daily for 14 days. Then, memory function was evaluated by Morris water maze test (MWM). Superoxide dismutase (SOD), Total antioxidant capacity (TAC), Acetylcholinesterase (AChE) activities, and malondialdehyde (MDA), nitric oxide (NO), brain-derived neurotrophic factor (BDNF), and B-cell lymphoma-2 (Bcl-2) levels in whole brain were assessed with the biochemical technique. Tumor necrosis factor-alpha (TNF-α) and Acetylcholine (ACh) were also assessed using an immunohistochemical technique. RESULTS: Administration of TQ significantly improved cognition. In addition, TQ significantly increased SOD and TAC and decreased AChE activities. It also decreased MDA and NO levels as well as TNF-α immunoreactivity and increased BDNF and Bcl-2 levels as well as ACh immunoreactivity. DISCUSSION: Our results indicate that TQ prevents D-gal/AlCl3-induced cognitive decline by enhancing cholinergic function and synaptic plasticity as well as attenuation of oxidative damage, neuronal apoptosis, and neuroinflammation. These results indicate that TQ holds potential for neuroprotection and may be a promising approach for the treatment of neurodegenerative disorders.


Subject(s)
Aluminum Compounds/toxicity , Alzheimer Disease/drug therapy , Benzoquinones/administration & dosage , Brain/drug effects , Chlorides/toxicity , Cognitive Dysfunction/drug therapy , Galactose/toxicity , Neuroprotective Agents/administration & dosage , Aluminum Chloride , Alzheimer Disease/chemically induced , Animals , Behavior, Animal/drug effects , Brain/metabolism , Brain/pathology , Cognitive Dysfunction/chemically induced , Disease Models, Animal , Male , Memory/drug effects , Rats, Sprague-Dawley
6.
Life Sci ; 183: 69-77, 2017 Aug 15.
Article in English | MEDLINE | ID: mdl-28599864

ABSTRACT

AIMS: The present study aims to investigate the effect of the new anorectic agent, lorcaserin, on estrous cyclicity, reproductive hormones and folliculogenesis in female mature rats. MATERIALS AND METHODS: Rats were divided into four groups; Group i: control group. Group ii-iv: rats treated with lorcaserin (5, 10 or 30mg/kg/day, p.o.), respectively. The treatment continued for 28days. KEY FINDINGS: Lorcaserin (5 or 10mg/kg) caused estrous cycle disturbance in 40% of treated rats while the high dose (30mg/kg) produced disturbances in 100% of the treated rats. Lorcaserin (5-30mg/kg) altered some of female hormones where it enhanced estradiol but reduced luteinizing hormone. Minimal edema with congested vessels was observed in the medulla of ovarian sections. Further, epithelial and uterine sections showed hyperplasia. SIGNIFICANCE: Taken together, the present results demonstrated that lorcaserin affected some reproductive hormones, disturbed estrous cyclicity and induced histopathological changes in the ovaries and uteri without affecting the ovarian populations. Therefore, lorcaserin should be used with caution in women of child bearing potential until adequate clinical safety data are available.


Subject(s)
Appetite Depressants/pharmacology , Benzazepines/pharmacology , Endometrial Hyperplasia/chemically induced , Estrous Cycle/drug effects , Ovary/drug effects , Animals , Appetite Depressants/administration & dosage , Benzazepines/administration & dosage , Dose-Response Relationship, Drug , Estradiol/metabolism , Female , Luteinizing Hormone/metabolism , Ovarian Follicle/drug effects , Ovary/pathology , Rats , Rats, Wistar , Uterus/drug effects , Uterus/pathology
7.
Naunyn Schmiedebergs Arch Pharmacol ; 390(6): 621-631, 2017 Jun.
Article in English | MEDLINE | ID: mdl-28224182

ABSTRACT

Poly(ADP-ribose) polymerase (PARP) enzyme contributes to nephropathy, a serious diabetic complication which may lead to end-stage renal disease. The study aims to investigate the effect of PARP over-activation on kidney functions in a type 2 diabetic rat model. The study also tests the therapeutic use of PARP inhibitors in diabetic nephropathy. Type 2 diabetes was induced in adult male rats by high-fructose/high-fat diet and low streptozotocin dose. Then, the PARP inhibitor 4-aminobenzamide (4-AB) was administered daily for 10 weeks. At the end, urine samples were collected to measure urine creatinine, albumin, and total proteins. PARP activity, superoxide dismutase (SOD) activity, and nitrite content were measured in kidney tissue homogenate. Glucose, fructosamine, insulin, and tumor necrosis factor-alpha (TNF-α) were measured in serum. Furthermore, histological studies, collagen deposition, and immunofluorescence of nuclear factor kappa B (NFκB) and transforming growth factor beta1 (TGF-ß1) were carried out. PARP enzyme activity was significantly higher in the diabetic group and was significantly reduced by 4-AB administration. Diabetic animals had clear nephropathy indicated by proteinuria and increased albumin excretion rate (AER) which were significantly decreased by PARP inhibition. In addition, PARP inhibition increased creatinine clearance in diabetic animals and reduced renal TGF-ß1 and glomerular fibrosis. Moreover, PARP inhibition alleviated the elevated serum TNF-α level, renal NFκB, nitrite, and the decrease in SOD activity in diabetic animals. However, PARP inhibition did not significantly affect neither hyperglycemia nor insulin sensitivity. PARP enzyme inhibition alleviates diabetic nephropathy through decreasing inflammation, oxidative stress, and renal fibrosis.


Subject(s)
Diabetes Mellitus, Experimental/drug therapy , Diabetes Mellitus, Type 2/drug therapy , Diabetic Nephropathies/drug therapy , Poly(ADP-ribose) Polymerase Inhibitors/pharmacology , Animals , Benzamides/pharmacology , Diabetes Mellitus, Experimental/complications , Diabetes Mellitus, Type 2/complications , Diabetic Nephropathies/pathology , Diet, High-Fat , Fibrosis/drug therapy , Fibrosis/pathology , Inflammation/drug therapy , Inflammation/pathology , Male , NF-kappa B/metabolism , Oxidative Stress/drug effects , Poly(ADP-ribose) Polymerases/drug effects , Poly(ADP-ribose) Polymerases/metabolism , Rats , Rats, Sprague-Dawley , Streptozocin/toxicity , Superoxide Dismutase/metabolism , Tumor Necrosis Factor-alpha/blood , para-Aminobenzoates/pharmacology
8.
Pharm Biol ; 55(1): 758-765, 2017 Dec.
Article in English | MEDLINE | ID: mdl-28064559

ABSTRACT

CONTEXT: Momordica charantia Linn (Cucurbitaceae) (MC) is used in folk medicine to treat various diseases including diabetes mellitus. OBJECTIVE: This study investigates the antidiabetic activities of Momordica charantia (bitter gourd) on streptozotocin-induced type 2 diabetes mellitus in rats. MATERIALS AND METHODS: Male Wister rats were randomly assigned to 4 groups. Group I, Normal control; Group II, STZ diabetic; Group III and IV, Momordica charantia fruit juice was orally administered to diabetic rats (10 mL/kg/day either as prophylaxis for 14 days before induction of diabetes then 21 days treatment, or as treatment given for 21 days after induction of diabetes). The effects of MC juice were studied both in vivo and in vitro by studying the glucose uptake of isolated rat diaphragm muscles in the presence and absence of insulin. Histopathological examination of pancreas was also performed. RESULTS: This study showed that MC caused a significant reduction of serum glucose (135.99 ± 6.27 and 149.79 ± 1.90 vs. 253.40* ± 8.18) for prophylaxis and treatment respectively, fructosamine (0.99 ± 0.01 and 1.01 ± 0.04 vs. 3.04 ± 0.07), total cholesterol, triglycerides levels, insulin resistance index (1.13 ± 0.08 and 1.19 ± 0.05 vs. 1.48 ± 1.47) and pancreatic malondialdehyde content (p < 0.05). While it induced a significant increase of serum insulin (3.41 ± 0.08 and 3.28 ± 0.08 vs. 2.39 ± 0.27), HDL-cholesterol, total antioxidant capacity levels, ß cell function percent, and pancreatic reduced glutathione (GSH) content (p < 0.05) and improved histopathological changes of the pancreas. It also increased glucose uptake by diaphragms of normal (12.17 ± 0.60 vs. 9.07 ± 0.66) and diabetic rats (8.37 ± 0.28 vs. 4.29 ± 0.51) in the absence and presence of insulin (p < 0.05). CONCLUSIONS: Momordica charantia presents excellent antidiabetic and antioxidant activities and thus has great potential as a new source for diabetes treatment whether it is used for prophylaxis or treatment.


Subject(s)
Diabetes Mellitus, Experimental/drug therapy , Fruit and Vegetable Juices , Hypoglycemic Agents/pharmacology , Momordica charantia , Animals , Antioxidants/pharmacology , Diabetes Mellitus, Experimental/pathology , Male , Pancreas/metabolism , Pancreas/pathology , Plant Extracts/pharmacology , Rats , Streptozocin
9.
Eur J Pharmacol ; 791: 444-454, 2016 Nov 15.
Article in English | MEDLINE | ID: mdl-27612628

ABSTRACT

Cardiovascular complications are the major causes of mortality among diabetic population. Poly(ADP-ribose) polymerase-1 enzyme (PARP-1) is activated by oxidative stress leading to cellular damage. We investigated the implication of PARP-1 in diabetic cardiac complications. Type 2 diabetes was induced in rats by high fructose-high fat diet and low streptozotocin dose. PARP inhibitor 4-aminobenzamide (4-AB) was administered daily for ten weeks after diabetes induction. At the end of study, surface ECG, blood pressure and vascular reactivity were studied. PARP-1 activity, reduced glutathione (GSH) and nitrite contents were assessed in heart muscle. Fasting glucose, fructosamine, insulin, and tumor necrosis factor alpha (TNF-α) levels were measured in serum. Finally, histological examination and collagen deposition detection in rat ventricular and aortic sections were carried out. Hearts isolated from diabetic animals showed increased PARP-1 enzyme activity compared to control animals while significantly reduced by 4-AB administration. PARP-1 inhibition by 4-AB alleviated cardiac ischemia in diabetic animals as indicated by ECG changes. PARP-1 inhibition also reduced cardiac inflammation in diabetic animals as evidenced by histopathological changes. In addition, 4-AB administration improved the elevated blood pressure and the associated exaggerated vascular contractility, endothelial destruction and vascular inflammation seen in diabetic animals. Moreover, PARP-1 inhibition decreased serum levels of TNF-α and cardiac nitrite but increased cardiac GSH contents in diabetic animals. However, PARP-1 inhibition did not significantly affect the developed hyperglycemia. Our findings prove that PARP-1 enzyme plays an important role in diabetic cardiac complications through combining inflammation, oxidative stress, and fibrosis mechanisms.


Subject(s)
Diabetes Mellitus, Type 2/complications , Heart/drug effects , Poly (ADP-Ribose) Polymerase-1/antagonists & inhibitors , Poly(ADP-ribose) Polymerase Inhibitors/pharmacology , Animals , Aorta/drug effects , Aorta/pathology , Aorta/physiopathology , Blood Pressure/drug effects , Coronary Vessels/drug effects , Coronary Vessels/pathology , Coronary Vessels/physiopathology , Disease Models, Animal , Heart/physiopathology , Heart Conduction System/drug effects , Heart Ventricles/drug effects , Heart Ventricles/pathology , Heart Ventricles/physiopathology , Male , Oxidative Stress/drug effects , Poly (ADP-Ribose) Polymerase-1/metabolism , Rats , Rats, Sprague-Dawley
10.
Eur J Pharmacol ; 724: 43-50, 2014 Feb 05.
Article in English | MEDLINE | ID: mdl-24378346

ABSTRACT

Stroke is the second leading cause of death in industrialized countries and the most frequent cause of permanent disability in adults worldwide. The final outcome of stroke is determined not only by the volume of the ischemic core, but also by the extent of secondary brain damage inflicted to penumbral tissues by brain swelling, impaired microcirculation, and inflammation. The only drug approved for the treatment ischemic stroke is recombinant tissue plasminogen activator (rt-PA). The current study was designed to investigate the protective effects of candesartan (0.15 mg/kg, orally) and glycyrrhizin (30 mg/kg, orally) experimentally-induced ischemic brain damage in C57BL/6 mice (middle cerebral artery occlusion, MCAO) in comparison to the effects of a standard neuroprotective drug (cerebrolysin, 7.5 mg/kg, IP). All drugs were administered 30 min before and 24h after MCAO. Both candesartan and glycyrrhizin ameliorated the deleterious effects of MCAO as indicated by the improvement in the performance of the animals in behaviour tests, reduction in brain infarction, neuronal degeneration, and leukocyte infiltration. In addition, MCAO induced a significant upregulation in the different elements of the TLR pathway including TLR-2 and TLR-4, Myd88, TRIF and IRF-3 and the downstream effectors TNF-α, IL-1ß, IL-6 and NF-kB. All these changes were significantly ameliorated by treatment with candesartan and glycyrrhizin. The results of the current study represent a new indication for both candesartan and glycyrrhizin in the management of ischemic stroke with effects comparable to those of the standard neuroprotective drug cerebrolysin.


Subject(s)
Benzimidazoles/therapeutic use , Brain Ischemia/drug therapy , Glycyrrhizic Acid/therapeutic use , Neuroprotective Agents/therapeutic use , Tetrazoles/therapeutic use , Adaptor Proteins, Vesicular Transport/genetics , Animals , Behavior, Animal/drug effects , Benzimidazoles/pharmacology , Biphenyl Compounds , Brain/drug effects , Brain/metabolism , Brain/pathology , Brain Ischemia/metabolism , Brain Ischemia/pathology , Brain Ischemia/physiopathology , Cytokines/metabolism , Down-Regulation , Glycyrrhizic Acid/pharmacology , Infarction, Middle Cerebral Artery , Interferon Regulatory Factor-3/genetics , Mice , Mice, Inbred C57BL , Myeloid Differentiation Factor 88/genetics , Neuroprotective Agents/pharmacology , Tetrazoles/pharmacology , Toll-Like Receptor 2/genetics , Toll-Like Receptor 4/genetics , Transcription Factor RelA/metabolism
11.
Saudi J Gastroenterol ; 18(3): 182-7, 2012.
Article in English | MEDLINE | ID: mdl-22626797

ABSTRACT

BACKGROUND/AIM: Portal hypertension is an important and potentially fatal complication of liver disease whereby cellular and fibrotic alterations manifest to increase portal venous pressure. The aim of this study is to investigate the effect of captopril, pentoxifylline (PTX), and cordyceps sinensis in pre-hepatic portal hypertensive rats. SETTINGS AND DESIGN: Wistar male rats were divided at random into 3 main groups: the first group: control rats. The second group: sham-operated rats and the third group: prehepatic portal hypertensive rats (PHPHT) induced by regulated pre-hepatic portal vein ligation. After 14 days, Group 3 was subdivided into 5 subgroups. Subgroup (1): portal vein-ligated (PVL) was killed at once; Subgroup (2): received distilled water for 30 days (untreated PVL group); subgroups 3-5 were treated with captopril (60 mg/kg, orally); PTX (100 mg/kg, orally); and C. sinensis (200 mg/kg, orally), respectively, as a single daily dose for 30 days. PATIENTS AND METHODS: Portal pressure, nitric oxide (NO), antioxidant enzymes, Liver enzymes, and creatinine levels were measured to evaluate the status of the liver state. RESULTS: Portal vein ligation produced significant increments in liver enzymes, NO, creatinine and portal pressure concomitant with significant decrements in glutathione content and superoxide dismutase activity. Treatment with captopril, PTX, and C. sinensis resulted in a significant reduction in liver enzymes, NO, creatinine and portal pressure and observable increase in antioxidant enzymes. CONCLUSIONS: captopril, PTX, and C. sinensis have promising effect in controlling PHPHT and reducing hyperdynamic circulatory state through reduction of portal pressure and NO level.


Subject(s)
Captopril/pharmacology , Cordyceps , Hypertension, Portal/drug therapy , Pentoxifylline/pharmacology , Analysis of Variance , Animals , Biomarkers/analysis , Disease Models, Animal , Hypertension, Portal/enzymology , Ligation , Liver Function Tests , Male , Portal Vein/surgery , Rats , Rats, Wistar
12.
Food Chem Toxicol ; 50(3-4): 1159-65, 2012 Mar.
Article in English | MEDLINE | ID: mdl-22226943

ABSTRACT

The present study aimed to investigate the antidiabetic effects of Cordyceps sinensis, taurine and their combination in comparison with glibenclamide both in vivo and in vitro using streptozotocin rat model. The diabetic rats were orally given glibenclamide, C. sinensis, taurine or Cordyceps and taurine combination for 21 days. Their effects were studied both in vivo and in vitro. Oral administration of Cordyceps, taurine and their combination decreased serum glucose, fructosamine, total cholesterol, triglycerides levels, insulin resistance index and pancreatic malondialdehyde content. Cordyceps significantly increased serum insulin, HDL-cholesterol, total antioxidant capacity levels, ß cell function percent, and pancreatic reduced glutathione (GSH) content. However, taurine was unable to elevate pancreatic GSH level to a significant level. These natural products and their combinations were more effective than glibenclamide in reducing insulin resistance index and they had stronger antioxidant properties. Cordyceps and taurine significantly enhanced glucose uptake by diaphragms of normal and diabetic rats in absence and presence of insulin. In conclusion, Cordyceps and taurine either alone or in combination have less potent hypoglycemic effects than glibenclamide; however, they have more ability to reduce insulin resistance and stronger antioxidant properties.


Subject(s)
Cordyceps/chemistry , Diabetes Mellitus, Experimental/drug therapy , Plant Extracts/pharmacology , Taurine/pharmacology , Administration, Oral , Animals , Diabetes Mellitus, Experimental/metabolism , Diabetes Mellitus, Experimental/pathology , Glutathione/metabolism , Male , Plant Extracts/administration & dosage , Rats , Streptozocin , Taurine/administration & dosage
13.
Br J Pharmacol ; 158(6): 1527-35, 2009 Nov.
Article in English | MEDLINE | ID: mdl-19845678

ABSTRACT

BACKGROUND AND PURPOSE: Disturbances in pulmonary vascular reactivity are important components of inflammatory lung disease. Haem oxygenase-1 (HO-1) is an important homeostatic enzyme upregulated in inflammation. Here we have investigated the potentially protective effect of HO-1 against cytokine-induced impairment in pulmonary artery relaxation. EXPERIMENTAL APPROACH: Haem oxygenase-1 protein levels were assessed by immunofluorescence. HO activity was assessed by conversion of haemin to bilirubin. Rings of rat isolated pulmonary artery in organ baths were used to measure relaxant responses to the endothelium-dependent agent ACh and the endothelium-independent agent sodium nitroprusside (SNP). Production of nitric oxide (NO) and reactive oxygen species (ROS) was assessed by confocal fluorescence microscopy and fluorescent probes. KEY RESULTS: Haem oxygenase-1 protein expression was strongly induced in pulmonary artery after 24-h incubation with either haemin (5 microM) or curcumin (2 microM), accompanied by a significant increase in HO activity. Incubation with tumour necrosis factor alpha (TNFalpha, 1 ng.mL(-1), 2 h) significantly decreased relaxation of arterial rings to ACh, without affecting responses to SNP. Induction of HO-1 by curcumin or haemin protected against TNFalpha-induced hyporesponsiveness to ACh. The competitive HO inhibitor, tin protoporphyrin (20 microM), abolished the protective effect of haemin. HO-1 induction prevented a TNFalpha-induced increase in NO generation without affecting the TNFalpha-induced increase in ROS generation. HO-1 induction prevented the TNFalpha-induced decrease in ACh-stimulated NO generation. CONCLUSIONS AND IMPLICATIONS: Induction of HO-1 protected against TNFalpha impairment of endothelium-dependent relaxation in pulmonary artery, by a mechanism involving a reduction in inducible NO synthase-derived NO production.


Subject(s)
Heme Oxygenase-1/metabolism , Pulmonary Artery/drug effects , Tumor Necrosis Factor-alpha/pharmacology , Vasodilation/drug effects , Acetylcholine/pharmacology , Animals , Curcumin/pharmacology , Endothelium, Vascular/drug effects , Endothelium, Vascular/enzymology , Enzyme Induction/drug effects , Fluorescent Antibody Technique , Gene Expression Regulation, Enzymologic/drug effects , Heme Oxygenase-1/drug effects , Heme Oxygenase-1/genetics , Hemin/pharmacology , In Vitro Techniques , Male , Nitric Oxide/metabolism , Nitric Oxide Synthase Type II/metabolism , Pulmonary Artery/metabolism , Rats , Rats, Wistar , Reactive Oxygen Species/metabolism
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