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Anti-stress Effects of Tunisian Cymbopogon schoenanthus L. Ethanol Extract and Some of Its Active Compounds

Journal of Agricultural Science and Technology(A) 2017年第2期7卷 91-99页

作者： Mahmoud Ben Othman mohamed neffati Hiroko Isoda Alliance for Research on North Africa (ARENA) University of Tsukuba 1-1-1 Tennodai Tsukuba City Ibaraki 305-85 72 Japan Faculty of Life and Environmental Sciences University of Tsukuba 1-1-1 Tennodai Tsukuba City lbaraki 305-8572 Japan Range Ecology Laboratory Arid Land Institute of Medenine Medenine 4119 Tunisia

Many antioxidant rich phytochemical extracts are attracting interest as stress adaptogens. In this regard, several plants are used traditionally and clinically for the management of neurologic disorders. Here, the anti-stress properties of the ethanol extract of medicinal plant Cymbopogon schoenanthus （CSEE）, which grows wild in Southern Tunisia, were investigated, as well as the effects of some of the extracted active compounds on H202-induced cytotoxicity, overproduction of reactive oxygen species （ROS） and adenosine triphosphate （ATP） depletion in human neuroblastoma SH-SYSY cells. Whereas fluorescence intensity due to DCFH-DA （a marker of ROS production） in H2O2-treated SH-SY5Y cells was greater than that in untreated control cells, pretreatrnent with CSEE and its active compounds ameliorated H2O2-induced ROS production. Moreover, H2O2 at 150 μM significantly decreased intracellular ATP levels in SH-SY5Y cells, and pretreatment with CSEE and its active compounds buffered this effect. These in vitro results demonstrate the potential of CSEE to protect against stress-associated disorders.

关键词： ATP levels H2O2 medicinal plant reactive oxygen species stress.

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Adaptive responses to drought of two Retama raetam subspecies from Tunisia

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Journal of Plant Ecology 2021年第3期14卷 527-540页

作者： Ricardo Gil Dhikra Zayoud Zeineb Ouerghi Monica Boscaiu Oscar Vicente mohamed neffati Instituto de Biologfa Molecular y Celular de Plantas(IBMCP UPV-CSIC)Universitat Politecnica de Valencia46022 ValenciaSpain Laboratoire des Ecosystemes Pastoraux et Valorisation des Plantes Spontanees et des Micro-organismes Associes Institut des Regions AridesUniversite de Gabes4119 MedenineTunisia Departement de Biologie Faculte des Sciences de Tunis1060 TunisTunisia Instituto Agroforestal Mediterraneo(IAM) Universitat Politecnica de Valencia46022 ValenciaSpain Instituto de Conservacion y Mejora de la Agrodivcrsidad Valenciana(COMAV) Universitat Politecnica de Valencia46022 ValenciaSpain

Aims The survival and ecological distribution of plants in arid habitats are mainly conditioned by water availability and physiological adaptations to withstand *** the present study,we have compared the physiological responses to drought of two Retama raetam(retama)subspecies from Tunisia,one of them living under the desert climate(***)and the other one growing on the coast(***).Methods To physiologically characterize the two *** subspecies,and to elucidate their main mechanisms underlying their tolerance to drought stress,parameters related to seed germination,growth,photosynthesis(net photosynthetic rate,intracellular CO_(2) concentration,transpiration rate,stomatal conductance and water-use efficiency)and accumulation of osmolytes(proline,glycine betaine[GB]and soluble sugars)were determined in 4-month-old plants subjected to stress for up to 1 *** Findings Drought significantly inhibited germination,growth and all the evaluated photosynthetic *** of *** *** were severely affected by drought after 3 weeks of treatment when photosynthesis rates were up to 7-fold lower than in the *** the same time,proline and GB significantly accumulated compared with the irrigated controls,but much less than in *** ***;in the latter subspecies,proline and GB increased to levels 24-and 6-fold higher,respectively,than in the corresponding *** summary,the population living in the desert region exhibited stronger tolerance to drought stress than that adapted to the semiarid littoral climate,suggesting that tolerance in *** is dependent on accumulation of osmolytes.

关键词： germination leaf gas exchange osmolytes Retama raetam water stress xerophytes

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Chemical Composition and Antimicrobial Activity of <i>Pituranthos chloranthus</i>(Benth.) Hook and <i>Pituranthos tortu-osus</i>(Coss.) Maire Essential Oils from Southern Tunisia

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Advances in Biological Chemistry 2015年第7期5卷 273-278页

作者： Hedi Mighri Khawla Sabri Hajer Eljeni mohamed neffati Ahmed Akrout Range Ecology Laboratory Arid Lands Institute University of Gabès Medenine Tunisia

Essential oils (EO) from fresh and dry aerial parts of Pituranthos chloranthus (Benth.) Hook and Pituranthos tortuosus (Coss.) Maire were isolated by hydrodistillation and analyzed by GC/MS. The main constituents of the EO obtained from fresh herb of P. chloranthus were found to be α-pinene, sabinene, cis-ocimene and myrcene. In dry biomass, a significant increase of the content of some compounds such as α-phellandrene, △,3-carene and β-phellandrene characterized the oil. Minor changes in the chemical composition of the P. tortuosus EOs obtained from fresh or dry herbs and the major constituents were found to be sabinene and myrcene with equilibrate amounts of α-pinene, p-cymene, cis-ocimene, limonene, trans-β-ocimene, γ-terpinene and cis-verbenol. The paper disc diffusion method was used to evaluate the antibacterial activity and results showed an important inhibitory effect of oils obtained from fresh herb against most tested bacteria.

关键词： Pituranthos Chloranthus Tortuosus Essential Oil South Tunisia

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Imidacloprid enhances liver damage in Wistar rats: Biochemical, oxidative damage and histological assessment

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Journal of Coastal Life Medicine 2017年第12期5卷 540-546页

作者： Sana Chakroun Intissar Grissa Lobna Ezzi Oumaima Ammar Fadoua neffati Emna Kerkeni mohamed Fadhel Najjar Zohra Haouas Hassen Ben Cheikh Laboratory of Histology and Cytogenetic(Research Unit of Genetic Genotoxicity and Childhood Illness UR12ES10)Faculty of MedicineUniversity of MonastirStreet AvicenneMonastir 5019Tunisia Laboratory of Biochemistry and Toxicology Fattouma Bourguiba UniversityHospital of MonastirMonastirTunisia

Objective: To investigate the potential adverse effects of imidacloprid on biochemical parameters, oxidative stress and liver damage induced in the rat by oral sub-chronic imidaclopride exposure. Methods: Rats received three different doses of imidacloprid (1/45, 1/22 and 1/10 of LD50) given through gavage for 60 days. Two dozen of male Wistar rats were randomly divided into four experimental groups. Liver damage was determined by measuring aspartate aminotransferase, alanine aminotransferase, alkaline phosphatase and lactate dehydrogenase leakages. The prooxidant-antioxydant status in hepatic tissue homogenate was evaluated by measuring the degree of lipid peroxidation, the antioxidant enzymes activities such as catalase, superoxide dismutase and glutathione peroxidase (GPx). Results: The relative liver weight was significantly higher than that of control and other treated groups at the highest dose 1/10 of LD50 of imidacloprid. Additionally, treatment of rats with imidacloprid significantly increased liver lipid peroxidation (P ≤ 0.05 or 0.01) which went together with a significant decrease in the levels of superoxide dismutase and catalase activities. Parallel to these changes, imidacloprid treatment enhanced liver damage as evidence by sharp increase in the liver enzyme activities of aspartate aminotransferase, alanine aminotransferase, alkaline phosphatase and lactate dehydrogenase. These results were also confirmed by histopathology. Conclusions: In light of the available data, it is our thought that after imidacloprid sub-chronic exposure, depletion of antioxidant enzymes is accompanied by induction of potential oxidative stress in the hepatic tissues that might affect the function of the liver which caused biochemical and histopathological alteration.

关键词： Imidacloprid Biochemical parameters Hepatotoxicity Oxidative stress Neonicotinoids

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