National Toxicology Center
National Toxicology Center
Chaphalkar R.,Narsee Monjee Institute of Management and Higher Studies |
Apte K.G.,National Toxicology Center |
Talekar Y.,National Toxicology Center |
Ojha S.K.,United Arab Emirates University |
Nandave M.,Narsee Monjee Institute of Management and Higher Studies
Oxidative Medicine and Cellular Longevity | Year: 2017
Phyllanthus emblica L. (amla) has been used in Ayurveda as a potent rasayan for treatment of hepatic disorders. Most of the pharmacological studies, however, are largely focused on PE fruit, while the rest of the parts of PE, particularly, bark, remain underinvestigated. Therefore, we aimed to investigate the protective effect of the hydroalcoholic extract of Phyllanthus emblica bark (PEE) in ethanol-induced hepatotoxicity model in rats. Total phenolic, flavonoid, and tannin content and in vitro antioxidant activities were determined by using H2O2 scavenging and ABTS decolorization assays. Our results showed that PEE was rich in total phenols (99.523±1.91 mg GAE/g), total flavonoids (389.33±1.25 mg quercetin hydrate/g), and total tannins (310±0.21 mg catechin/g), which clearly support its strong antioxidant potential. HPTLC-based quantitative analysis revealed the presence of the potent antioxidants gallic acid (25.05 mg/g) and ellagic acid (13.31 mg/g). Moreover, one-month PEE treatment (500 and 1000 mg/kg, p.o.) followed by 30-day 70% ethanol (10 mL/kg) administration showed hepatoprotection as evidenced by significant restoration of ALT (p<0.01), AST (p<0.001), ALP (p<0.05), and TP (p<0.001) and further confirmed by liver histopathology. PEE-mediated hepatoprotection could be due to its free radical scavenging and antioxidant activity that may be ascribed to its antioxidant components, namely, ellagic acid and gallic acid. Thus, the results of the present study support the therapeutic claims made in Ayurveda about Phyllanthus emblica. © 2017 Renuka Chaphalkar et al.
Attarde S.S.,Guru Nanak Institutions |
Apte K.G.,National Toxicology Center
International Journal of Pharmacognosy and Phytochemical Research | Year: 2013
Objective: Mesobuthus tumulus is the most lethal among all poisonous species of scorpion. Aristolochia indica is one of the plants which have long been used in traditional herbal medicine for the treatment of poisoning by animal bites. Hence the study was planned to evaluate the ethanolic extract of Aristolochia indica for the treatment of Mesobuthus tamulus envenoming. Materials and Methods: Calculation of LD99 of Mesobuthus tamulus venom was done using Turner's method. Acute toxicity and Neutralization of the lethal venom effect of Mesobuthus tamulus venom by plant extract at the dose of 1gm/kg and 2gm/kg in vivo was seen. Results: The LD99 of Mesobuthus tamulus venom from this study was determined to be 22.6μg/gm. In the acute toxicity and in vivo neutralization study plant extract at the dose of 1gm/kg and 2gm/Kg resulted in mean survival of 59mins and 51mins respectively. Neutralization of the lethal venom effect by plant extract at the dose of 1gm/kg and 2gm/kg by Alam and Gome's method showed mean survival of 88 mins and 75 mins respectively. Conclusion: Ethanolic extract of Aristolochia indica has protective effect against the Red Scorpion Venom and shows 50% survival benefits in mice.
Pingle B.R.,Narsee Monjee Institute of Management and Higher Studies |
Apte K.G.,National Toxicology Center |
Gupta M.,Narsee Monjee Institute of Management and Higher Studies |
Chakraborthy G.S.,Noida Institute of Engineering and Technology
Pharmacologyonline | Year: 2011
Herbal drugs are traditionally used in various parts of the world to cure different diseases. The present study has been conducted to evaluate the protective role of different extracts of grains of Eleusine coracana (Poeceae) against carbon tetrachloride (CCL4) induced hepatotoxicity in rats. E. coracana exhibited significant hepatoprotective activity by reducing CCl4 induced change in biochemical parameters that was evident by enzymatic examination. The extracts at an oral dose of 500 mg/kg exhibited a significant protective effect by lowering the serum levels of serum glutamate pyruvate transaminase (SGPT), serum glutamate oxaloacetate transaminase (SGOT), alkaline phosphatase (ALP) and total protein. The activity of extract was comparable to the standard drug, Silymarin (100 mg/kg, p.o.). Histopathological observations also revealed that treatment with Eleusine coracana extracts protected the animal from CCL4 induced liver damage. The results indicate that the different extracts of Eleusine coracana grains possess hepatoprotective activity on CCL4 induced hepatic injury in rats.
Puranik A.S.,University of Pune |
Halade G.,University of Texas Health Science Center at San Antonio |
Kumar S.,National Center for Cell science |
Mogre R.,Applied Biotech Vile Parle |
And 2 more authors.
Evidence-based Complementary and Alternative Medicine | Year: 2011
Safety pharmacology studies help in identifying preclinical adverse drug reactions. We carried out routine safety pharmacology with focus on cardiovascular variables and pharmacokinetic herb-drug interaction studies on rats fed with standardized traditional hydro-alcoholic extract and technology-based supercritical extract of Cassia auriculata for 12 weeks. Our studies indicate that both these extracts are pharmacologically safe and did not show any significant adverse reactions at the tested doses. The traditional hydro-alcoholic extract did not show any significant effect on pharmacokinetics; however, the technology-based supercritical extract caused a significant reduction in absorption of metformin. Our results indicate the need to include pharmacokinetic herb-drug interaction studies as evidence for safety especially for technology-based extracts. Copyright 2011 Amrutesh S. Puranik et al.
Rosano T.G.,Albany Medical College |
Rosano T.G.,National Toxicology Center |
Ohouo P.Y.,National Toxicology Center |
LeQue J.J.,National Toxicology Center |
And 2 more authors.
Journal of Analytical Toxicology | Year: 2016
Drug screening is an essential analytical tool for detection of therapeutic, illicit and emerging drug use. Presumptive immunoassay screening is widely used, while initial definitive testing by chromatography-coupled mass spectrometry is hampered due to complex pre-analysis steps, long chromatography time and matrix effects. The aim of this study is to develop and validate a definitive test for rapid and threshold accurate screening of 33 drugs or metabolites (analytes) in urine. Sample preparation in a 96-well plate format involves rapid glucuronidase hydrolysis followed by dilution, filtration and ultra-performance liquid chromatography-MS-MS analysis. Chromatographic separation, on an ACQUITY UPLC® BEH phenyl column is optimized for a 3-min MS-MS ion acquisition. Matrix effect was normalized by an innovative technique called threshold accurate calibration employing an additional analysis with an analyte spike as an internal standard undergoing the same matrix effect as an analyte in a drug-positive donor specimen. Accuracy and precision, at above and below threshold concentrations, were determined by replicate analysis of control urine pools containing 50, 75, 125 and 150% of threshold concentrations. Accuracy and selectivity were further demonstrated by concordant findings in proficiency and confirmatory testing. The study shows the applicability of definitive testing as an alternative to immunoassay screening and demonstrates a new approach to normalization of matrix effect. © The Author 2016. Published by Oxford University Press. All rights reserved.
PubMed | Waters Corporation, National Toxicology Center and Albany Medical College
Type: Journal Article | Journal: Journal of analytical toxicology | Year: 2016
Drug screening is an essential analytical tool for detection of therapeutic, illicit and emerging drug use. Presumptive immunoassay screening is widely used, while initial definitive testing by chromatography-coupled mass spectrometry is hampered due to complex pre-analysis steps, long chromatography time and matrix effects. The aim of this study is to develop and validate a definitive test for rapid and thresholdaccurate screening of 33 drugs or metabolites (analytes) in urine. Sample preparation in a 96-well plate format involves rapid glucuronidase hydrolysis followed by dilution, filtration and ultra-performance liquid chromatography-MS-MS analysis. Chromatographic separation, on an ACQUITY UPLC
Ameri A.,Ahvaz Jundishapur University of Medical Sciences |
Rajive B.B.,Armed Force Medical College Dalanwala |
Vaidya J.G.,University of Pune |
Apte K.,National Toxicology Center |
Deokule S.S.,University of Pune
International Journal of Applied Research in Natural Products | Year: 2013
Topical antimicrobial therapy is one of the most important methods of wound care. In this investigation, we evaluated topical gel preparations of Ganoderma praelongum and Glycyrrhiza glabra aqueous extracts alone and in combination for antimicrobial and wound healing activities in MRSA - infected excision and incision wound models in mice. Gel formulations containing 0.3% G. praelongum, 2.5% G. glabra and combination of the two were prepared and tested for their influence on wound infection, wound contraction and epithelization phases of wound healing. Mupirocin ointment was applied as a standard treatment antibiotic. Results indicated that all three gel formulations promoted wound healing in both models by influencing wound contraction and epithelization phases. Examination of wounds at the end of our study period revealed that wounds treated with G. praelongum and G. glabra gel formulations (combination gel) showed considerable contraction and epithelization as compared to the gel base - treated group (negative control). Assumption could be made that this wound promotion is due to the anti - Staphylococcal activity of Ganoderma and wound healing activity of G. glabra. Industrial relevance. Medicine using fungal metabolites is now recognized. A mushroom that has gained worldwide attention is Ganoderma lucidum and has been used to treat a wide spectrum of ailments including fungal and bacterial infections for long periods of time throughout history of ancient traditional medicine. Previous reports indicate that ganoderma lucidum mycelia are usually prescribed in the form of soup, syrup, tea, tablets, capsules, tincture or bolus or injected as a solution of powdered spores.In this study, the combination gel containing aqueous extracts of G. praelongum and G. glabra effectively inhibited the growth of methicillin resistant Staphylococcus aureus and promoted wound healing in mice. Further phytochemical studies are needed to pinpoint the active components of the extracts. Moreover, various topical formulations containing combination of the two extracts are suggested to be prepared and evaluated for wound healing in clinical trials. © 2008-2013. IJARNP-HS Publication.
Hardikar A.A.,University of Sydney |
Satoor S.N.,University of Sydney |
Satoor S.N.,National Center for Cell Science |
Karandikar M.S.,DY Patil Medical College |
And 20 more authors.
Cell Metabolism | Year: 2015
People in developing countries have faced multigenerational undernutrition and are currently undergoing major lifestyle changes, contributing to an epidemic of metabolic diseases, though the underlying mechanisms remain unclear. Using a Wistar rat model of undernutrition over 50 generations, we show that Undernourished rats exhibit low birth-weight, high visceral adiposity (DXA/MRI), and insulin resistance (hyperinsulinemic-euglycemic clamps), compared to age-/gender-matched control rats. Undernourished rats also have higher circulating insulin, homocysteine, endotoxin and leptin levels, lower adiponectin, vitamin B12 and folate levels, and an 8-fold increased susceptibility to Streptozotocin-induced diabetes compared to control rats. Importantly, these metabolic abnormalities are not reversed after two generations of unrestricted access to commercial chow (nutrient recuperation). Altered epigenetic signatures in insulin-2 gene promoter region of Undernourished rats are not reversed by nutrient recuperation, and may contribute to the persistent detrimental metabolic profiles in similar multigenerational undernourished human populations. © 2015 Elsevier Inc.
Makadiya V.S.,Maharashtra Institute of Pharmacy |
Kulkarni Y.A.,Maharashtra Institute of Pharmacy |
Apte K.G.,National Toxicology Center
Journal of Herbs, Spices and Medicinal Plants | Year: 2015
Toxicity of aqueous extract (AE) of stem bark of Bauhinia variegata was evaluated. In the acute toxicity study, Sprague-Dawley rats were treated orally with AE (2,000 or 5,000 mg.kg-1 b.w). The animal behavior and mortality were observed periodically for up to 14 d. In the repeated dose toxicity study, the AE was administered daily at doses of 1,000 or 2,000 mg.kg-1 b.w, for 28 d. Behavior and mortality of animals were observed during the test period and hematological, biochemical parameters and histopathological examinations were carried out. In acute toxicity study, AE did not produce any mortality, changes in behavior, or any other physiological activities in rats at all selected doses. In repeated dose toxicity study, the monocytes and lymphocytes decreased at high doses. AE did not affect the biochemical parameters (except glucose) and the organs weight. Histopathology studies revealed no changes in cellular structure of the organs studied. The AE of B. variegata had maximally tolerated dose (MTD) of 5,000 mg.kg-1 in acute toxicity study and lowest observed adverse effect level of 1,000 mg.kg-1 in repeated-dose toxicity study in rats. © Taylor & Francis Group, LLC.
Banerjee A.G.,Banaras Hindu University |
Das N.,Banaras Hindu University |
Shengule S.A.,National Toxicology Center |
Srivastava R.S.,Banaras Hindu University |
Shrivastava S.K.,Banaras Hindu University
European Journal of Medicinal Chemistry | Year: 2015
A series of triazin-3(2H)-one derivatives bearing 1,3,4-oxadiazole (4a-4o) were synthesized, characterized and evaluated for anti-inflammatory and analgesic activities. Preliminary in vitro anti-inflammatory activity was assessed using an albumin denaturation assay. The promising compounds were further evaluated in acute, sub-chronic and chronic animal models of inflammation. Derivatives 4d, 4e, 4g, 4j and 4l exhibited significant anti-inflammatory activity with reduced ulcerogenic, hepatotoxic and renotoxic liabilities compared to standard indomethacin. These potential derivatives were also evaluated for in vivo analgesic activity using a writhing model and the formalin-induced paw licking response in mice. Compounds 4d, 4e and 4g exhibited comparable analgesic activity, whereas 4j and 4l yielded moderate effects. The specificity of compounds 4d, 4e, 4g, 4j, and 4l to inhibit (cyclooxygenase-1) COX-1 and (cyclooxygenase-2) COX-2 isozymes and their kinetics were also determined via an in vitro COX inhibition assay. In silico docking studies were performed using a molecular dynamics simulation of the most active compound 4d (COX-2 IC50: 3.07 μM) at the COX-2 active site. The outcome of this exercise helped to verify the consensual interaction of these compounds with the enzyme. © 2015 Elsevier Masson SAS.