Pharmaceutical Sciences and Natural Products - Research Publications

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Author: search.filters.author.Jaitak, V.Has files: Yes

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    Antimicrobial and repellent activity of the essential oils of two lamiaceae cultivated in Western Himalaya
    (Bentham Science Publishers B.V., 2015) Stappen, Iris; Ali, Abbas; Tabanca, Nurhayat; Khan,Ikhlas A.; Wanner, J�rgen; Gochev, Velizar K.; Singh, Virendra; Lal, Brij; Jaitak, Vikas; Kaul, Vijay K.; Schmidt, Erich; Jirovetz, Leopold; Stappen, I.; Ali, A.; Tabanca, N.; Khan, I.A.; Wanner, J.; Gochev, V.K.; Singh, V.; Lal, B.; Jaitak, V.; Kaulh, V.K.; Schmidt, E.; Jirovetz, L.
    The essential oils of two Lamiaceae cultivated in Western Himalaya were examined on their antimicrobial, biting deterrent as well as larvicidal activity. Additionally their odors are described and their chemical compositions analyzed by GC-MS are given. The main component of Nepeta cataria oil was 4a?,7?,7a?-nepetalactone (85%), whereas camphor (27%) and 1,8-cineol (27%) were dominant in the oil of Rosmarinus officinalis. The studied essential oils demonstrated high to moderately antimicrobial activity against reference strains, clinical and food spoilage isolates of Bacillus cereus, Staphylococcus aureus, Escherichia coli, Salmonella abony and Candida albicans (MIC 160-640 ?g/ml) and indicated low activity against Pseudomonas aeruginosa and P. fluorescens. Both oils showed biting deterrent activity above solvent control but lower than DEET. Nepeta catarica essential oil exhibited high toxicity with LD50 value of 20.2 whereas R. officinalis oil showed only 50% mortality at the highest tested dose of 125 ppm against 1-day old Aedes aegypti larvae at 24-hour post treatment. ? 2015 Bentham Science Publishers.
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    Chemical composition and biological effects of artemisia maritima and artemisia nilagirica essential oils from wild plants of Western Himalaya
    (Georg Thieme Verlag, 2014) Stappen, Iris; Wanner, J, rgen; Tabanca, Nurhayat; Wedge, David E.; Ali, Abbas; Khan, Ikhlas A.; Kaul, Vijay K.; Lal, Brij; Jaitak, Vikas; Gochev, Velizar; Girova, Tania; Stoyanova, Albena; Schmidt, Erich; Jirovetz, Leopold; Stappen, I.; Wanner, J.; Tabanca, N.; Wedge, D.E.; Ali, A.; Khan, I.A.; Kaul, V.K.; Lal, B.; Jaitak, V.; Gochev, V.; Girova, T.; Stoyanova, A.; Schmidt, E.; Jirovetz, L.
    Artemisia species possess pharmacological properties that are used for medical purposes worldwide. In this paper, the essential oils from the aerial parts of Artemisia nilagirica and Artemisia maritima from the western Indian Himalaya region are described. The main compounds analyzed by simultaneous GC/MS and GC/FID were camphor and 1,8-cineole from A. maritima, and camphor and artemisia ketone from A. nilagirica. Additionally, the oils were evaluated for their antibacterial, antifungal, mosquito biting deterrent, and larvicidal activities. A. nilagirica essential oil demonstrated nonselective antifungal activity against plant pathogens Colletotrichum acutatum, Colletotrichum fragariae, and Colletotrichum gloeosporioides, whereas A. maritima did not show antifungal activity. Both Artemisia spp. exhibited considerable mosquito biting deterrence, whereas only A. nilagirica showed larvicidal activity against Aedes aegypti. Antibacterial effects assessed by an agar dilution assay demonstrated greater activity of A. maritima essential oil against Staphylococcus aureus and Pseudomonas aeruginosa compared to A. nilagirica.
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    New approaches to target cancer stem cells: Current scenario
    (2014) Insan, Mayank Bashyal; Jaitak, Vikas; Insan, M.B.; Jaitak, V.
    Resistance towards chemotherapy and radiotherapy as well as relapse of cancer is the major obstacle in the treatment of cancer. The main factor behind is cancer stem cells (CSCs) which are more resistant to conventional chemotherapy, radiotherapy and are quite able to regenerate whole new tumor again if remain alive during treatment. Targeting CSCs along with actively dividing cancer cells may significantly contribute to the solution of the problem of resistance and relapse. Various approaches are implemented to eradicate CSCs which include CSC markers specific compounds, Drugs which disturb niche and various inhibitors/modulators of signaling pathways. Hedgehog (Hh), Wnt and Notch pathways are modulated/inhibited using various agents and shown beneficial results in multiple forms of cancer. Many inhibitors/modulators of these pathways have been entered in the clinical trials. MicroRNAs have also been developed as anti CSCs agents. In this review, we have covered current status of CSC targeting therapy based on CSC markers, CSC niche, Hedgehog, Wnt, Notch pathway along with MicroRNA based targeting strategies and possibility of implementation multi-targeted anti-CSC therapy for the better outcome of the results. ? 2014 Bentham Science Publishers.