Browsing by Author "Mishra, S"

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Effect of TiO2 and Fe doped TiO2 nanoparticles on mitochondrial membrane potential in HBL-100 cells
(American Institute of Physics, 2019) Barkhade, T; Mishra, S; Chander, Harish; Mahapatra, S.K; Banerjee, I.
Titanium dioxide (TiO2) nanoparticles (NPs) have made unbelievable progress in the field of nanotechnology and biomedical research. The proper toxicological assessment of TiO2 NPs and the reduction of its cytotoxicity need to be addressed. Fe doping in TiO2 has been investigated to reduce the toxic effects of TiO2 NPs. Fe doped TiO2 powder samples were synthesized by sol-gel methods. The prepared samples were characterized by x-ray diffractometer (XRD), transmission electron microscope (TEM), and Raman spectroscopy to study their structure, morphology, and molecular conformation. XRD results revealed the coexistence of anatase (A) and rutile (R) phases of TiO2. The A-R transformation was observed with an increase in Fe doping along with the formation of α-Fe2O3 phase. TEM showed changes in morphology from spherical nanoparticles to elongated rod-shaped nanostructures with increasing Fe content. Shape variation of TiO2 nanoparticles after incorporation of Fe is a key reason behind the toxicity reduction. The authors observed that the toxicity of TiO2 nanoparticles was rescued upon Fe incorporation. The effect of NPs on the mitochondrial membrane potential (MMP) was assessed using flow cytometry. The MMP (%) decreased in TiO2 treated cells and increased by 1% Fe doped TiO2 NPs treated cells. Confocal imaging revealed the presence of functional mitochondria upon the exposure of Fe doped TiO2 NPs. The goal of the present study was to decrease the toxic effects induced by TiO2 NPs on mitochondrial potential and its prevention by Fe doping. © 2019 Author(s).
KIBRA Team Up with Partners to Promote Breast Cancer Metastasis
(Springer, 2019) Singh G; Mishra, S; Chander, Harish
Among women, breast cancer is the most frequently diagnosed cancer. Most of the breast cancers represent metastasis to distant organs at the time of diagnosis and accounts for the majority of deaths. Metastasis is characterized by many genetic aberrations including mutations, overexpression of oncogenes etc. KIBRA (KIdney/BRAin protein), a scaffolding protein is recently described as an important player in the process of invasion and metastasis. The Kidney/BRAin protein through its different domains interacts with various proteins to couple cytoskeleton arrangement, cell polarity and migration. N terminal and C terminal of the protein contains the WW, Internal C 2 & putative class III PDZ domain that interacts with DDR1, DLC1 & PKCζ. These protein-protein interactions equip the breast cancer cells to invade and metastasize. Here, we discuss a comprehensive knowledge about the KIBRA protein, its domains and the interacting partners involved in metastasis of breast cancer. © 2019, Arányi Lajos Foundation.
Synthesis of gadolinium oxide nanocuboids for in vitro bioimaging applications
(Institute of Physics Publishing, 2019) Chawda, N; Mishra, S; Basu, M; Chander, H; Podder, R; Mahapatra, S.K; Banerjee, I.
Undoped and Eu-doped gadolinium oxide (GGNCs and EGNCs) nanocuboids functionalized with D-gluconic acid (GA) were synthesised by a simple yet unique scheme using all the benign solvents and temperature. Samples were characterized and presented with properties like good dispersity, biocompatibility, and stability required for standard contrast agent used in magnetic resonance imaging (MRI) and optical coherence tomography (OCT). Biological assays such as 3-(4, 5-dimethyl-2-yl)-2, 5-diphenyltetrazoliumbromide (MTT) assay, flow cytometry and confocal microscopy were used to determine its biocompatibility, cellular internalization and optical cellular imaging using A549 and H1299 lung cancer cell lines. EGNCs treated with cell lines emitted red fluorescence which was used to track the internalization of EGNCs within the cells. GGNCs sample showed ?20% enhanced MRI relaxivity as compared to EGNCs; whereas EGNCs revealed better contrast in doctor scans of OCT. Samples could be used as promising candidate for other biomedical applications such as drug delivery when equipped with well functionalised drug molecules.