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Makhijani K, Kumbhare LB, Nayak M, Kunwar A, Singh BG. Bis(1-methylimidazol-2-yl) diselenide and its evaluation as a chemical radio-protector: role of kinetic rate constants for ROS scavenging and glutathione peroxidase like activity. Free Radic Res 2024; 58:43-56. [PMID: 38165076 DOI: 10.1080/10715762.2023.2299341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Accepted: 11/29/2023] [Indexed: 01/03/2024]
Abstract
Bis(1-methylimidazol-2-yl) diselenide (MeImSe), a derivative of selenoneine, has been examined for bimolecular rate constants for scavenging of various radiolytically and non-radiolytically generated reactive oxygen species (ROS). Further, its potential to show glutathione peroxidase (GPx)-like activity and to protect in vitro models of DNA and lipid against radiation induced strand breakage and lipid peroxidation, respectively were studied. The results confirmed that MeImSe scavenged all major short-lived (hydroxyl radical) and long-lived (peroxyl radical, carbonate radical, nitrogen dioxide radical, hypochlorite and hydrogen peroxide) oxidants involved in the radiation toxicity either directly or through GPx-like catalytic mechanism. The rate constants of MeImSe for these oxidants were found to be comparable to analogous sulfur and selenium-based compounds. The enzyme kinetics study established that MeImSe took part in the GPx cycle through the reductive pathway. Further, MeImSe inhibited the radiation induced DNA strand cleavage and lipid peroxidation with half maximal inhibitory concentration (IC50) of ∼ 60 μM and ∼100 μM, respectively. Interestingly, MeImSe treatment in the above concentration range (>100 μM) did not show any significant toxicity in normal human lung fibroblast (WI26) cells. The balance between efficacy and toxicity of MeImSe as a chemical radioprotector was attributed to the formation of less reactive intermediates during its oxidation/reduction reactions as evidenced from NMR studies.HighlightsMeImSe, a derivative of selenoneine protects DNA and lipid from radiation damageMeImSe scavenges all major short- and long-lived oxidants involved in radiation toxicityRate constants of MeImSe for ROS scavenging determined by pulse radiolysis techniqueFirst organoselenium compound reported to scavenge nitrogen dioxide radicalMeImSe exhibits GPx-like activity through reductive pathway.
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Affiliation(s)
- K Makhijani
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, India
| | - L B Kumbhare
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai, India
| | - M Nayak
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, India
- Homi Bhabha National Institute, Mumbai, India
| | - A Kunwar
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, India
- Homi Bhabha National Institute, Mumbai, India
| | - B G Singh
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, India
- Homi Bhabha National Institute, Mumbai, India
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Singh BG, Gandhi VV, Phadnis PP, Kunwar A. Identification of a pyridine derivative of diselenides as a potent inhibitor of the main protease of SARS-CoV-2 through in silico screening and biochemical evaluation. NEW J CHEM 2022. [DOI: 10.1039/d2nj02744e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Among the 22 organoselenium compounds studied, 2-Py2Se2 & Nict2Se2 showed the highest affinity for Mpro. The biochemical studies confirmed their superiority as compared to standard compound like Ebselen in terms of the IC50 required for Mpro inhibition.
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Affiliation(s)
- B. G. Singh
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai-400085, India
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai-400085, India
| | - V. V. Gandhi
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai-400085, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai-400094, India
| | - P. P. Phadnis
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai-400085, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai-400094, India
| | - A. Kunwar
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai-400085, India
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai-400085, India
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Deshmukh Y, Gandhi VV, Singh BG, Kumbhare LB, Debnath AK, Kunwar A. 3,3'-Diselenodipropionic acid (DSePA) forms 1:1 complex with Hg (II) and prevents oxidative stress in cultured cells and mice model. J Inorg Biochem 2021; 226:111638. [PMID: 34717254 DOI: 10.1016/j.jinorgbio.2021.111638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2021] [Revised: 09/30/2021] [Accepted: 10/13/2021] [Indexed: 10/20/2022]
Abstract
Mercury is one of the most toxic heavy metal for mammals particularly in inorganic form. In present study, 3,3'-diselenodipropionic acid (DSePA), a well-known pharmacological diselenide was evaluated for its interaction with HgCl2 and ability to prevent HgCl2-induced toxicity in experimental cellular and mice models. UV-visible, stopped flow, Fourier-transform infrared spectroscopy and 1H nuclear magnetic resonance spectroscopy studies confirmed that DSePA sequestered Hg (II) ions with stoichiometry of 1:1 and binding constant of ~104 M-1. X-ray photoelectron spectroscopy and X-ray powder diffraction analysis suggested that diselenide group of DSePA was involved in the complexation with Hg (II) ions. Further, Hg-DSePA complex degraded within 10 days to form excretable HgSe. The binding constant of DSePA and Hg (II) was comparable with that of dihydrolipoic acid, a standard disulfide compound used in heavy metal detoxification. Corroborating these observations, pre-treatment of DSePA (10 μM) significantly prevented the HgCl2 (50 μM)-induced glutathione oxidation (GSH/GSSG), decrease of thioredoxin reductase (TrxR) and glutathione peroxidase (GPx) activities and cell death in Chinese Hamster Ovary (CHO) cells. Similarly, intraperitoneal administration of DSePA at a dosage of 2 mg/kg for 5 consecutive days prior to exposure of HgCl2 (1 mg/kg) significantly suppressed oxidative stress in renal and hepatic tissues of C57BL/6 mice. In conclusion, the protective effect of DSePA against Hg induced oxidative stress is attributed to its ability to rescue the activities of GPx, TrxR and GSH by sequestering Hg (II) ions. DSePA being a relatively safer selenium-compound for in vivo administration can be explored for mercury detoxification.
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Affiliation(s)
- Y Deshmukh
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India; Center for Basic Sciences, Pt. Ravishankar Shukla University, Raipur 492010, India
| | - V V Gandhi
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai 400 094, India
| | - B G Singh
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai 400 094, India
| | - L B Kumbhare
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - A K Debnath
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400 094, India; Technical Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - A Kunwar
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai 400 094, India.
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Dutta B, Barick KC, Verma G, Aswal VK, Freilich I, Danino D, Singh BG, Priyadarsini KI, Hassan PA. PEG coated vesicles from mixtures of Pluronic P123 and l-α-phosphatidylcholine: structure, rheology and curcumin encapsulation. Phys Chem Chem Phys 2018; 19:26821-26832. [PMID: 28949348 DOI: 10.1039/c7cp05303g] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
PEG coated vesicles are important vehicles for the passive targeting of anticancer drugs. With a view to prepare PEG decorated vesicles using co-assembly of block copolymers and lipids, here we investigated the microstructure of aggregates formed in mixtures comprising lipids (l-α-phosphatidylcholine) and block copolymers (Pluronic P123), in the polymer rich regime. DLS and SANS studies show that the structure of the aggregates can be tuned from micelles to rod-like micelles or vesicles by changing the lipid to polymer composition. Rheological studies on gels formed by mixtures of polymer and lipid suggest incorporation of the lipid into the polymer matrix. The encapsulation efficiencies of polymer incorporated liposomes for curcumin and doxorubicin hydrochloride (DOX) are evaluated at different drug to carrier ratios. The pH dependent sustained release of both the drugs from the PEGylated liposomes suggests their application in the development of cost effective formulations for anticancer drug delivery.
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Affiliation(s)
- Bijaideep Dutta
- Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400 085, India.
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Das RP, Singh BG, Kunwar A, Ramani MV, Subbaraju GV, Hassan PA, Priyadarsini KI. Tuning the binding, release and cytotoxicity of hydrophobic drug by Bovine Serum Albumin nanoparticles: Influence of particle size. Colloids Surf B Biointerfaces 2017; 158:682-688. [PMID: 28783613 DOI: 10.1016/j.colsurfb.2017.07.048] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Revised: 06/12/2017] [Accepted: 07/21/2017] [Indexed: 11/26/2022]
Abstract
To elucidate the effect of particle size of albumin nanoparticles on cellular uptake of a hydrophobic drug, herein we report the release kinetics and cytotoxicity of nanoparticle bound dimethylcurcumin (DMC) in A549 tumor cells. The bovine serum albumin (BSA) nanoparticles were prepared by thermal denaturation and characterized by dynamic light scattering (DLS), zeta (ζ) -potential, circular dichroism (CD) and transmission electron microscope (TEM). The preparation conditions were optimized to obtain nanoparticles with mean hydrodynamic diameters 28.0nm (BSAnp1) and 52.0nm (BSAnp2) and corresponding ζ- potential value of∼-7.0 and -6.0mV, respectively. Interaction of DMC with BSA nanoparticles was investigated by UV-vis, fluorescence and CD spectroscopy. CD studies indicated significant changes in the secondary structure of BSA upon particle formation, as revealed by decrease in the helicity. The cellular uptake of DMC increased with increase in particle size and the toxicity of DMC loaded nanoparticles to A549 cells were found to be consistent with their cellular uptake. Between the two formulations studied, BSAnp2 provided enhanced cellular uptake and can be used as an effective delivery system for hydrophobic drugs like DMC.
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Affiliation(s)
- R P Das
- Radiation & Photochemistry Division, Trombay, Mumbai, 400085, India
| | - B G Singh
- Radiation & Photochemistry Division, Trombay, Mumbai, 400085, India.
| | - A Kunwar
- Radiation & Photochemistry Division, Trombay, Mumbai, 400085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400 094, India
| | - M V Ramani
- Natsol Laboratories Pvt. Ltd, Ramky commercial Hub, J. N. Pharmacity, Visakhapatnam, 531019, India
| | - G V Subbaraju
- Natsol Laboratories Pvt. Ltd, Ramky commercial Hub, J. N. Pharmacity, Visakhapatnam, 531019, India
| | - P A Hassan
- Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400 094, India
| | - K I Priyadarsini
- Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400 094, India
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Priyadarsini KI, Singh BG. Selenium Centered Radicals: How Do They Differ from Sulfur Centered Radicals? Proc Natl Acad Sci , India, Sect A Phys Sci 2016. [DOI: 10.1007/s40010-016-0308-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Singh BG, Nadkarni SA, Jain VK, Priyadarsini KI. Effect of alkyl chain length on one-electron oxidation of bis(alkyl carboxylic acid) selenides: implication on their antioxidant ability. RSC Adv 2015. [DOI: 10.1039/c5ra10355j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Formation of a stable five membered transient in seleno bis(propanoic acid) reduces its radiolytic degradation and enhances its peroxyl radical scavenging activity.
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Affiliation(s)
- B. G. Singh
- Radiation & Photochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400 085
- India
| | - S. A. Nadkarni
- Radiation & Photochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400 085
- India
| | - V. K. Jain
- Chemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400 085
- India
| | - K. I. Priyadarsini
- Radiation & Photochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400 085
- India
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Prabhu P, Bag PP, Singh BG, Hodage A, Jain VK, Iwaoka M, Priyadarsini KI. Effect of functional groups on antioxidant properties of substituted selenoethers. Free Radic Res 2011; 45:461-8. [PMID: 21235282 DOI: 10.3109/10715762.2010.543678] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Selenoethers attached to functional groups through propyl chain viz., bis(3-carboxypropyl)selenide (SeBA), bis(3-hydroxypropyl)selenide (SePOH) and bis(3-aminopropyl)selenide dihydrochloride (SePAm), have been examined for their ability to inhibit peroxyl radical mediated DNA damage, peroxyl radical scavenging ability and glutathione peroxidase (GPx) like activity. The DNA damage was monitored by gel electrophoresis, bimolecular rate constants for scavenging of model peroxyl radical were determined by pulse radiolysis and the GPx activity was followed by their ability to reduce hydrogen peroxide in the presence of glutathione utilizing NADPH decay and HPLC analysis. Among these compounds, SeBA showed maximum DNA protecting activity and it was also the most efficient in scavenging peroxyl radicals with the highest GPx mimicking activity. Quantum chemical calculations confirmed that SeBA with the highest energy level of HOMO (highest occupied molecular orbital) is the easiest to undergo oxidation and therefore exhibits better radical scavenging, GPx mimicking and DNA protecting activity than SePOH or SePAm.
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Affiliation(s)
- P Prabhu
- Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India
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Singh CJ, Singh BG. Antimycotic effects of some antibiotics on the growth of some dermatophytes and other keratin degrading fungi. Hindustan Antibiot Bull 1997; 39:61-3. [PMID: 10386017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
Four antibiotics have been tested against the growth of some dermatophytes and keratin degrading fungi. A gradual decrease in growth was observed with increase in concentration of all antibiotics. All, but griseofulvin observed to inhibit > 50% mycelial weight even at a lower concentration of 50 ppm. Azole derivatives were most toxic to the growth of M. gypseum at all concentrations, whereas, to that of C. tropicum at above 100 ppm. Mycostatin was the most toxic antibiotic to the growth of M. gypsea at all concentrations.
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Affiliation(s)
- C J Singh
- Department of Botany, St. Johns College, Agra, India
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