Browsing by Author "Arvind Kumar R. Singh"

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Influences of aqua-(2-formylbenzoato) triphenyltin(IV) on regression of hypoxic solid tumor through mitochondrial mediated pathway by inhibiting Hif-1 alpha
(Nature Research, 2025) Virendra Pratap Singh; Ranjeet Kumar Singh; Pooja Goswami; Partha Pratim Manna; Tushar S. Basu Baul; Abhijit Mandal; Arvind Kumar R. Singh; Biplob Koch
Tumor hypoxia is the major hindrance behind cancer chemotherapy and the foremost reason for the less effectiveness of most anticancer drugs. We herein inquire into the mechanistic part and therapeutic efficacy of our previously reported compound, aqua-(2-formylbenzoato) triphenyltin (IV) (abbreviated as OTC), in a hypoxic solid tumor-bearing mouse model (BALB/c). In addition to solid tumors, we investigated the therapeutic potential of OTC in intraperitoneal tumor and in in vitro system. Following treatment, mitochondrial dynamics, tumor load regression, survival analysis and histopathological parameters were analyzed. Furthermore, the differential expression levels of cleaved PARP-1, Hif-1α, VEGF and apoptotic genes such as Bax, Bcl-2, p53, and caspase 3 at the mRNA and protein levels were assessed. Our findings demonstrate that OTC significantly induces tumor regression and increased survivability by down regulating the expression of the hypoxia-associated genes Hif-1α and VEGF while elevating the levels of cleaved PARP-1 and p53. In contrast, the commercially available drug doxorubicin was found less effective and failed to respond in the tumor microenvironment. Furthermore, increased mitochondrial aggregation and membrane permeability and activation of Bax, caspase 3 and caspase-9 and release of Cytochrome-c from the mitochondrial membrane at RNA level confirms the mitochondrial pathway of apoptosis. Therefore, our present findings reveal that newly synthesized OTC potentially induces apoptosis and could be a promising compound against the tumor microenvironment. © The Author(s) 2025.
Theoretical and computational study on structure, dynamics, and configurational entropy correlation in gold-silicon liquid
(American Institute of Physics, 2025) Raj Kumar Patel; Arvind Kumar R. Singh; R. Lalneihpuii; Raj Kumar Mishra
The structure-property relationship of partially ordered systems poses a different type of open problem for both theoretical and experimental condensed matter researchers. Configurational entropy is an important thermodynamic property that characterizes the glass transition ability of binary liquid alloys. Recently, various experimental and computational approaches have been reported to investigate the configurational entropy in liquids; however, a well-established theoretical definition is still lacking. In this study, the configurational entropy of binary melts has been computed using their pair correlation functions. We determine three partial structure factors that govern the total structure factor S(k) in liquid AuySix alloys at different compositions and temperatures. Fourier inversion of partial and total structure factors gives partial pair correlation functions and radial distribution functions g(r) of AuySix melts, respectively. The computed values of S(k) and g(r) are in excellent agreement with available experimental results. The present model calculation of S(k) for eutectic AuySix melts (x = 19 at. % Si) shows better agreement with the experimental values than the molecular dynamics simulation data. Furthermore, we determine the friction coefficients experienced by constituent particles in the attractive and repulsive regions of the square-well (SW) potential function and employed in Einstein's equation to determine the self- and mutual diffusion coefficients as a function of composition and temperature. The diffusivity of Au and the mutual diffusion coefficient of the alloy are also in good agreement with experimental values compared to molecular dynamics data at its eutectic composition, which confirms the applicability of the SW model for such alloys. © 2025 Author(s).