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Author

Gaganmeet Singh

Other affiliations: University of Dundee
Bio: Gaganmeet Singh is an academic researcher from Department of Biotechnology. The author has contributed to research in topics: Leishmania donovani & Drug resistance. The author has an hindex of 8, co-authored 9 publications receiving 326 citations. Previous affiliations of Gaganmeet Singh include University of Dundee.

Papers
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Journal ArticleDOI
TL;DR: The effect of miltefosine in arsenite-resistant Leishmania donovani (Ld-As20) promastigotes displaying an MDR phenotype and overexpressing Pgp-like protein was investigated and results indicate that Ld- as20 is sensitive to milteFosine.

99 citations

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TL;DR: The n-hexane, ethyl acetate, methanol, and acetone extracts of Piper cubeba Linn and P. retrofractum were evaluated in vitro against promastigotes of Leishmania donovani, and all exhibited significant in vitro activity at 100 μg/ml.
Abstract: The n-hexane, ethyl acetate, methanol, and acetone extracts of Piper cubeba Linn. and P. retrofractum Vahl. (Piperaceae) were evaluated in vitro against promastigotes of Leishmania donovani, and all exhibited significant in vitro activity at 100 μg/ml. Two lignans, cubebin and hinokinin, were isolated from the hexane extract of P. cubeba; and one bis-epoxy lignan, (−)-sesamin, and two amides, pellitorine and piplartine, were isolated from the hexane and methanol extracts of P. retrofractum. Cubebin and piplartine showed significant antileishmanial activity in vitro at 100 μM and were further tested in vivo in a hamster model of visceral leishmaniasis. Piplartine showed activity at 30 mg/kg dose. This is the first report of antileishmanial activity of these two plants and their isolated constituents.

96 citations

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TL;DR: It is reported that the arsenite resistant strain of L. donovani promastigotes shows cross-resistance to novobiocin, a catalytic inhibitor of topoisomerase II, with IC50 value of 320 microg ml-1, which strongly suggest the apoptosis-like mode of cell death.

54 citations

Journal ArticleDOI
TL;DR: The treatment of promastigotes at drug concentrations inhibiting 50% of topo II activity inflicted a regulated cell death sharing several apoptotic features like externalization of phosphatidylserine, loss of mitochondrial membrane potential, cytochrome C release into the cytosol, activation of cellular proteases and DNA fragmentation.

44 citations

Journal ArticleDOI
TL;DR: A rapid ecovery was seen with withdrawal of liposomal amphoericin B and flucytosine, strengthening the conclusion that the condition was solely related to an adverse drug eaction.

18 citations


Cited by
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Journal ArticleDOI
TL;DR: This review will initially describe current drug regimens and later will provide an overview on few important biochemical and enzymatic machineries that could be utilized as putative drug targets for generation of true antileishmanial drugs.

347 citations

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TL;DR: It is concluded that piplartine is effective for use in cancer therapy and its safety using chronic toxicological studies should be addressed to support the viability of clinical trials.

244 citations

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TL;DR: Data indicate that artemisinin has promising anti-leishmanial activity that is mediated by programmed cell death and, accordingly, merits consideration and further investigation as a therapeutic option for the treatment of leishmaniasis.
Abstract: A major impediment to effective anti-leishmanial chemotherapy is the emergence of drug resistance, especially to sodium antimony gluconate, the first-line treatment for leishmaniasis. Artemisinin, a sesquiterpene lactone isolated from Artemisia annua, is an established anti-malarial compound that showed anti-leishmanial activity in both promastigotes and amastigotes, with IC(50) values of 160 and 22 microM, respectively, and, importantly, was accompanied by a high safety index (>22-fold). The leishmanicidal activity of artemisinin was mediated via apoptosis as evidenced by externalization of phosphatidylserine, loss of mitochondrial membrane potential, in situ labelling of DNA fragments by terminal deoxyribonucleotidyltransferase-mediated dUTP nick end labelling (TUNEL) and cell-cycle arrest at the sub-G(0)/G(1) phase. Taken together, these data indicate that artemisinin has promising anti-leishmanial activity that is mediated by programmed cell death and, accordingly, merits consideration and further investigation as a therapeutic option for the treatment of leishmaniasis.

210 citations

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TL;DR: Current drug regimens, putative drug targets, numerous natural products that have shown promising antileishmanial activity along with some key issues and strategies for future research to control leishmaniasis worldwide are described.

169 citations

Journal ArticleDOI
01 Feb 2009-Micron
TL;DR: The variety of drug stimuli converge to the same pathway of death suggests an intense cross-talking between the three types of PCD in the protozoa.

145 citations