All about Pharmacognosy

All about Pharmacognosy

Archive for October, 2011

Assessment of Tumor Prevention in Type 1 Neurofibromatosis using a Nitroxide Compound

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Research Article |

doi:10.5530/ax.2011.3.3 ,
Published Online:

Abstract:
Background: Type 1 Neurofibromatosis (NF1) is a genetic disorder linked to mutations of the NF1 gene. Clinical symptoms are varied, but hallmark features of the disease include skin pigmentation anomalies (café au lait macules, skinfold freckling) and dermal neurofibromas. Method: These dermal manifestations of NF1 have previously been reported in a mouse model where Nf1+/- mice are topically treated with dimethylbenz[a]anthracene (DMBA) and 12-O-tetradecanoylphorbol- 13-acetate (TPA). We adopted this mouse model to test the protective effects of a nitroxide antioxidant, 5-carboxy-1,1,3,3- tetramethylisoindolin-2-yloxyl (CTMIO). Antioxidants have previously been shown to increase longevity in nf1-deficient fruitflies. Doses of 4μM and 40μM CTMIO provided ad libitum in drinking water were given to Nf1-deficient mice. Results: Consistent with previous reports, Nf1-deficient mice showed a 4.7-fold increase in papilloma formation (P < 0.036). However, neither dose of CTMIO had any significant affect on papilloma formation. A non-significant decrease in skin pigmentation abnormalities was seen with 4μM but not 40μM CTMIO. Subsequent analysis of genomic DNA isolated from papillomas indicated that DMBA/TPA induced tumors did not exhibit a local loss of heterozygosity (LOH) at the Nf1 locus. Conclusion: These data reveal that oral antioxidant therapy with CTMIO does not reduce tumor formation in a multistage cancer model, but also that this model does not feature LOH for Nf1.

Keywords: neurofibromatosis type 1, tumorigenesis, papillomas, antioxidant, nitroxide

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Regulation of Membrane Unsaturation as Antioxidant Adaptive Mechanism in Long-lived Animal Species

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Research Article |

doi:10.5530/ax.2011.3.2 ,
Published Online:

Abstract:
Oxidative stress resulting from biomolecular oxidative damage due to the imbalance between reactive species production and antioxidant response has become an universal constraint of life-history evolution in animals and a modulator of phenotypic development and trade-offs. Redox balance is an important selective pressure faced by most organisms, and a myriad of mechanisms have evolved to regulate and adjust this balance. This diversity of mechanisms means that organisms have a great deal of flexibility in how they deal with reactive species challenges across time, conditions, and tissue types, as well as that different organisms may evolve different strategies for dealing with similar challenges. In the following paragraphs, we review the adaption of biological membranes as structural antioxidant defense against reactive species evolved by animals. In particular, it is our goal to describe the physiological mechanisms underlying the structural adaption of cellular membranes to oxidative stress, to explain the meaning of this adaptive mechanism, and to review the state of the art about the link between membrane composition and longevity of animal species.

Keywords: Fatty acid desaturases, Membrane unsaturation, Oxidative damage, Peroxidizability index, Phylogenomic analysis, Reactive carbonyl species

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Diabetes Mellitus and Oxidative Stress in the Gastrointestinal Tract-Connecting the Dots

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Editorial |

doi:10.5530/ax.2011.3.1 ,
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Abstract:

Keywords: Editorial

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Written by admin

October 25th, 2011 at 7:14 am

Development of the HPLC method to determine the metabolites of isomajdine isolated from Vinca herbacea Waldst. et Kit. growing in Georgia

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Natia Gagua, C Aubert, Valentina Vachnadze, Aliosha Bakuridze

Journal of Natural Pharmaceuticals 2011 2(3):163-165

Background: It was decided to develop a reliable HPLC method coupled with ultraviolet detection for simultaneous determination of isomajdine and its metabolites in in vitro experiment. Methods: A liquid liquid extraction was used to extract the compounds from plasma. The analysis was carried out on a ZorbaxC18 column (250mmx4.6mm, 5&#956;m). The mobile phase consisted of water (A) and acetonitril (B) (16:84, V/V) used in gradient mode: 16 (B) for 10 min, 71 (B) for 55 minute, 16 (B) 62 minutes, pumped at 1ml/min. Results: 4 metabolites have been detected and separeted. tha linearity was invetigated. Conclusion: The calibration curves showed good linearity with correlation coefficient greater that 0.996 for the analytes in the investigated range.So the HPLC method is precise, accurate and simple.

Written by Natia Gagua

October 18th, 2011 at 12:00 am

Anticancer, cytotoxic potential of Moringa oleifera extracts on HeLa cell line

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Shruti Nair, KN Varalakshmi

Journal of Natural Pharmaceuticals 2011 2(3):138-142

Background: The objective of the study was to analyze the anticancer property of Moringa oleifera on HeLa cells and also to analyze its safety on human peripheral lymphocytes. Materials and Methods: Using ethnomedical data approach, the Indian medicinal plant (M. oleifera) that is used in traditional medicine for cancer and non-cancerous diseases was collected. The crude extracts were prepared by alcoholic and aqueous extraction methods using standard protocols. The antiproliferative effects of the aqueous and alcoholic extracts were evaluated in vitro by employing MTT assay, viability test by trypan blue dye exclusion and apoptosis of the cancer cells were confirmed by DNA fragmentation analysis, ethidium bromide- acridine orange (EB/AO) staining. Results: The aqueous extract of M. oleifera showed good cytotoxicity which was concentration dependent. It was contradictory incase of methanolic and hexane extracts, the cell viability was found to increase as the concentration of extract increased. It states that not only the concentration of extract is having an effect on cell viability, even the methods and solvents of extraction are important in exerting their effects on cell lines. At the same time, the extracts showed proliferative effects on the normal human lymphocytes. Conclusion: The aqueous extract of M. oleifera exhibited cytotoxic effects on Hela cells and least cytotoxicity on lymphocytes. For plants that are used as anticancer herbal drugs, our results indicated a correlation between the reported use of these plants and their cytotoxic activity on cancer cells.

Written by Shruti Nair

October 18th, 2011 at 12:00 am

HPLC analysis of protoberberine alkaloids in Phellodendron lavallei D. introduced to Western Georgia

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Mariam Meskheli, Valentina Vachnadze, Dali Berashvili, Aliosha Bakuridze

Journal of Natural Pharmaceuticals 2011 2(3):154-157

Background : Phellodendron lavallei D. is one of the oldest medicinal plants and is of current interest as a natural medicine. The aim of our study was to determine the features and amount of the content of berberine, palmatine, jatrorrhizine, and magnoflorine in the overall preparation enriched by pharmacologically active alkaloids, obtained from the bark of P. lavallei, using HPLC. Materials and Methods: The chromatographic separation was carried out using a Zorbax SB-C18 column (250 &#215; 4.6 mm, 5 &#956;m; Waters), mobile phase MeOH 20 mL/mol and KH 2 PO 48:52 (pH 2.6). The UV detection was performed at 235 nm. Results: A good linear behavior over the investigated concentration range was observed with the value r2 > 0.9999. The amount of palmatine, jatrorrhizine, magnoflorine, and berberine in the extract was determined and the following results were achieved: berberine 7.6%, palmatine 0.77%, jatrorrhizine 0.9%, and magnoflorine 57%. Conclusion: Study results show that this method of HPLC might be used to determine alkaloids such as berberine, palmatine, jatrorrhizine, and magnoflorine in P. lavallei D .

Written by Mariam Meskheli

October 18th, 2011 at 12:00 am

Flavonoids inhibited NADPH consumption and ecdysis processes in Oncopeltus fasciatus

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Juliana Oliveira Abreu Narciso, Marco Antonio Soares de Souza, Mario Geraldo de Carvalho, Mário Sergio da Rocha Gomes, Marcelo Genestra, Marise Maleck de Oliveira Cabral

Journal of Natural Pharmaceuticals 2011 2(3):133-137

Background: Piptadenia rigida is a source of flavonoids such as isoliquiritigenin ( 1 ), 7,3',4'-trihydroxyflavone ( 2 ) and 7,8,3',4'-tetrahydroxyflavanone ( 3 ). Flavonoids influence on the feeding behavior of insects besides the inhibition of the insect larvae growth. Nitric oxide (NO) seems to be conserved in invertebrate innate immunity and the NO synthase (NOS) activity has been implicated in insect immunity. Therefore, the NOS expression can be evaluated to determine the inhibition of NADPH consumption. Material and Methods: three natural flavonoids, isolated from P. rigida whose structures were determined by 1 H and 13 C NMR spectral data analysis, were evaluated on the Oncopeltus fasciatus control by molting processes and NADPH consumption in the insect intestine following mortality. Results: The flavonoids treatment on O. fasciatus showed 50% mortality and 50% ecdysis ( 1 ), 30% mortality and 43% ecdysis ( 2 ), and topical treatment with th 3 resulted in 43% ecdysis but did not show high toxicity at 100&#956;g/nymph. Intestine homogenates obtained from insects treated with flavonoids that were incubated with NADPH substrate showed percentage inhibitions of 72%, 78% and 80%, for the treatments 3, 1 and 2, respectively. Conclusion: The flavanone ( 3 ) was the most effective and least toxic to the insect, followed by 2 and then 1 .

Written by Juliana Oliveira Abreu Narciso

October 18th, 2011 at 12:00 am

Comparative toxicity assessment of three Tephrosia species on Artemia salina and animal cell lines

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Sandhya Subhadra, Venkata Ramana Kanacharalapalli, Vinod Kombath Ravindran, Sai Kumar Parre, Sunitha Chintala, Rajeswar Thatipally

Journal of Natural Pharmaceuticals 2011 2(3):143-148

Background: Tephrosia calophylla, Tephrosia maxima and Tephrosia purpurea are generally used in the treatment of various ailments including cancer by the folklore of Indian subcontinent. Materials and Methods: The powdered root of three plants were separately extracted with chloroform and then subjected to preliminary chemical screening. The total phenolic and flavonoid content were estimated by using gallic acid and quercetin as standard. Brine shrimp hatchability and lethality tests were done by hatching the cysts of Artemia salina in brine solution. As these parameters can be associated to tumor cells, the investigation was extrapolated to animal cell lines, Daltons Lymphoma Ascites (DLA) and Erlisch Ascites Carcinoma (EAC). Trypan blue exclusion method was adopted for this screening. In all experiments dose selected were between the ranges of 10 and 200 &#956;g/mL. Results: Preliminary chemical screening revealed the presence of carbohydrates, proteins, alkaloids, tannins and flavonoids for T. calophylla and T. maxima; proteins, alkaloids, tannins and flavonoids for T. purpurea. The total phenolic and flavonoid content was found to be highest in the case of T. calophylla followed by T. maxima and then by T. purpurea. It was observed that in all the cytotoxicity tests performed T. calophylla was proved to be most potent followed by T. maxima and then by T. purpurea. The results thus obtained were found to correlate with the values obtained for total phenolic and flavonoid content. Conclusion: The present investigation revealed that all three species of Tephrosia to be potent cytotoxic agents. Increasing order of cytotoxicity can be denoted as T.purpurea < T.maxima < T.calophylla. Further studies have to be performed to identify the chemical entity responsible for efficient cytotoxicity which may help in the development of suitable lead compounds.

Written by Sandhya Subhadra

October 18th, 2011 at 12:00 am

Effect of oral administration of ethanolic root extract of Tinospora cordifolia on aflatoxin B 1 -induced toxicity in swiss albino mice

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Veena Sharma, Rekha Gupta, Shatruhan Sharma

Journal of Natural Pharmaceuticals 2011 2(3):125-132

Background: Aflatoxins are potent hepatotoxic and hepatocarcinogenic agents. This hepatotoxicity is thought to be mediated by their ability to generate reactive oxygen species and cause peroxidative damage. Considering the antioxidant properties of Tinospora cordifolia, this study was undertaken to evaluate the therapeutic efficacy of Tinospora cordifolia root extract in terms of altered biochemical, hematological, serological and histopathological parameters. Methods: Sixty male swiss albino mice were taken for post exposure therapy. Results: Aflatoxin exposure elicited a significant escalation in the level of thiobarbituric acid reactive substances and depletion in reduced glutathione, protein, ascorbic acid and antioxidant enzymes, namely, superoxide dismutase, catalase, glutathione peroxidase, glutathione reductase and glutathione S-transferase activities. Chronic aflatoxin ingestion showed a significant decline in total erythrocyte count, lymphocyte count, hemoglobin, hematocrit values while total leukocyte count, platelet count and neutrophil count significantly increased in the aflatoxin-treated group. The activities of aspartate transaminase, alanine transaminase and alkaline phosphate augmented significantly in the serum of aflatoxin-exposed mice suggesting hepatic damage. Aflatoxin administration decreased the content of high density lipoprotein while increased the content of cholesterol, triglyceride, low density lipoprotein and very low density lipoprotein significantly. Pathological examination of the liver tissue also supported the biochemical findings. However, post-exposure administration of Tinospora cordifolia root extract to the aflatoxin-treated group attenuated the deranged parameters to some extent. Conclusion: This study indicated that Tinospora cordifolia can be a protective regimen for aflatoxin toxicity.

Written by Veena Sharma

October 18th, 2011 at 12:00 am

Laxative potential of the ethanolic leaf extract of Aloe vera (L.) Burm. f. in Wistar rats with loperamide-induced constipation

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A.O.T Ashafa, TO Sunmonu, AA Abass, AA Ogbe

Journal of Natural Pharmaceuticals 2011 2(3):158-162

Background: Constipation is a highly prevalent and often chronic functional gastrointestinal disorder affecting humans irrespective of race and color exposing victims to colorectal cancer. The present study evaluated the efficacy of the ethanolic leaf extract of Aloe vera against loperamide-induced constipation in rats. Materials and Methods: Rats were constipation induced by the oral administration of loperamide (3 mg/kg body weight) while the control animals received normal saline. Constipated rats were treated with 50, 100, and 200 mg/kg body weight/day of the ethanolic leaf extract for 7 days during which the feeding characteristics, body weight, fecal properties, and gastrointestinal transit ratio were monitored. Results: Treatment of constipated rats with the extract at 50, 100, and 200 mg/kg body weight for 7 days improved intestinal motility, increased fecal volume, and normalized body weight in the constipated rats. These are indications of the laxative property of the herb with the 200 mg/kg body weight of the extract showing the best efficacy. Conclusion: The effect of the extract compares favorably well with Gaviscon, a standard laxative drug. These findings have therefore lent scientific support to the use of the herb as a laxative agent in Nigerian folkloric medicine.

Written by A.O.T Ashafa

October 18th, 2011 at 12:00 am

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