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John J, Suresh S, Sivakumar M, Gopchandran K, Pillai VM. Ni doping induced property enhancement in laser ablated BaSnO 3 films suitable for optoelectronic applications. Heliyon 2024; 10:e26688. [PMID: 38468923 PMCID: PMC10925979 DOI: 10.1016/j.heliyon.2024.e26688] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Accepted: 02/18/2024] [Indexed: 03/13/2024] Open
Abstract
Pulsed laser deposition is a straightforward approach for preparing films with superconducting to dielectric properties with atomic layer precision. The deep-seated mechanisms involved in the particle transport from target to substrate and subsequent film formation still need to be fully comprehended. This manuscript reports the property enhancement observed in laser ablated perovskite BaSnO3 films with Ni doping. Films' crystallinity improvement is observed, and an intensity enhancement of 1150% is observed on 3 mol% Ni-doping. The optimum Ni-doping concentration in BaSnO3 is found to be 3 mol%. Herein, Ni-doped BaSnO3 films deposited by PLD showed an unusual increase in film thickness (i.e., from 615 nm in the pure film to 1317 nm in the film with 7 mol% Ni-doping as revealed by lateral SEM analysis and spectroscopic ellipsometry). We propose an "Induced Magnetic field-assisted Particle Convergence (IMPC)" effect for this superficial growth enhancement. The film's optical properties are modified with an increased nickel doping level, and the bandgap energy shows renormalization. All the films show excellent transmittance (80-90%) in the Vis.-NIR region. Hall-effect measurement reveals the increased carrier concentration by three orders (2.98 × 1011 to 3.50 × 1014 cm-3). In addition, the enhancement in mobility from 3.13 to 20.93 cm2V-1s-1 and a decrease in electrical resistivity by six orders (i.e., from 4.05 × 109 to 1.13 × 103 Ω cm) are observed on 7 mol% Ni doping. XPS measurements reveals that the Ba, Sn and Ni ions are at 2+, 4+ and 2+ oxidation states. Using spectroscopic ellipsometric method, we estimated the optical constants of the films, the refractive index, dielectric constant, and extinction coefficient show a normal dispersion behavior. The high crystallinity, high transmittance, suitable surface topography, and improved electrical performances of the Ni-doped BaSnO3 films make them excellent candidates for optoelectronic devices and solar cells.
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Affiliation(s)
- Jibi John
- Department of Optoelectronics, University of Kerala, Thiruvananthapuram, Kerala, India
| | - S. Suresh
- Department of Optoelectronics, University of Kerala, Thiruvananthapuram, Kerala, India
- Department of Electronics, SreeAyyappa College, Chengannur, Kerala, India
| | - M. Sivakumar
- Department of Physics, Amrita School of Physical Sciences, Coimbatore, Amrita Vishwa Vidyapeetham, India
| | - K.G. Gopchandran
- Department of Optoelectronics, University of Kerala, Thiruvananthapuram, Kerala, India
| | - V.P. Mahadevan Pillai
- Department of Optoelectronics, University of Kerala, Thiruvananthapuram, Kerala, India
- Department of Physics, Amrita School of Physical Sciences, Coimbatore, Amrita Vishwa Vidyapeetham, India
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Carter J, Hulse M, Sivakumar M, Burtell J, Thodima V, Wang M, Agarwal A, Vykuntam K, Spruance J, Bhagwat N, Rager J, Ruggeri B, Scherle P, Ito K. PRMT5 Inhibitors Regulate DNA Damage Repair Pathways in Cancer Cells and Improve Response to PARP Inhibition and Chemotherapies. Cancer Res Commun 2023; 3:2233-2243. [PMID: 37861290 PMCID: PMC10627093 DOI: 10.1158/2767-9764.crc-23-0070] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 08/04/2023] [Accepted: 10/10/2023] [Indexed: 10/21/2023]
Abstract
Expression of protein arginine methyltransferase 5 (PRMT5) is highly positively correlated to DNA damage repair (DDR) and DNA replication pathway genes in many types of cancer cells, including ovarian and breast cancer. In the current study, we investigated whether pharmacologic inhibition of PRMT5 downregulates DDR/DNA replication pathway genes and sensitizes cancer cells to chemotherapy and PARP inhibition. Potent and selective PRMT5 inhibitors significantly downregulate expression of multiple DDR and DNA replication genes in cancer cells. Mechanistically, PRMT5 inhibition reduces the presence of PRMT5 and H4R3me2s on promoter regions of DDR genes such as BRCA1/2, RAD51, and ATM. PRMT5 inhibition also promotes global alternative splicing changes. Our data suggest that PRMT5 inhibition regulates expression of FANCA, PNKP, and ATM by promoting exon skipping and intron retention. Combining C220 or PRT543 with olaparib or chemotherapeutic agents such as cisplatin demonstrates a potent synergistic interaction in breast and ovarian cancer cells in vitro. Moreover, combination of PRT543 with olaparib effectively inhibits the growth of patient-derived breast and ovarian cancer xenografts. Furthermore, PRT543 treatment significantly inhibits growth of olaparib-resistant tumors in vivo. These studies reveal a novel mechanism of PRMT5 inhibition and suggest beneficial combinatorial effects with other therapies, particularly in patients with tumors that are resistant to therapies dependent on DNA damage as their mechanism of action. SIGNIFICANCE Patients with advanced cancers frequently develop resistance to chemotherapy or PARP inhibitors mainly due to circumvention and/or restoration of the inactivated DDR pathway genes. We demonstrate that inhibition of PRMT5 significantly downregulates a broad range of the DDR and DNA replication pathway genes. PRMT5 inhibitors combined with chemotherapy or PARP inhibitors demonstrate synergistic suppression of cancer cell proliferation and growth in breast and ovarian tumor models, including PARP inhibitor-resistant tumors.
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Affiliation(s)
- Jack Carter
- Prelude Therapeutics Incorporated, Wilmington, Delaware
| | - Michael Hulse
- Prelude Therapeutics Incorporated, Wilmington, Delaware
| | | | | | | | - Min Wang
- Prelude Therapeutics Incorporated, Wilmington, Delaware
| | | | | | | | - Neha Bhagwat
- Prelude Therapeutics Incorporated, Wilmington, Delaware
| | - Joseph Rager
- Prelude Therapeutics Incorporated, Wilmington, Delaware
| | - Bruce Ruggeri
- Prelude Therapeutics Incorporated, Wilmington, Delaware
| | - Peggy Scherle
- Prelude Therapeutics Incorporated, Wilmington, Delaware
| | - Koichi Ito
- Prelude Therapeutics Incorporated, Wilmington, Delaware
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Islam F, Dehbia Z, Zehravi M, Das R, Sivakumar M, Krishnan K, Billah AAM, Bose B, Ghosh A, Paul S, Nainu F, Ahmad I, Emran TB. Indole alkaloids from marine resources: Understandings from therapeutic point of view to treat cancers. Chem Biol Interact 2023; 383:110682. [PMID: 37648047 DOI: 10.1016/j.cbi.2023.110682] [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: 07/12/2023] [Revised: 08/12/2023] [Accepted: 08/26/2023] [Indexed: 09/01/2023]
Abstract
Cancer is the leading cause of mortality all over the world. Scientific investigation has demonstrated that disruptions in the process of autophagy are frequently interrelated with the emergence of cancer. Hence, scientists are seeking permanent solutions to counter the deadly disease. Indole alkaloids have been extensively studied and are acknowledged to exhibit several bioactivities. The current state of disease necessitates novel pharmacophores development. In recent decades, indole alkaloids have become increasingly significant in cancer treatment and are also used as adjuvants. A substantial amount of pharmacologically active molecules come from indole alkaloids, which are widely distributed in nature. Indole alkaloids derived from marine organisms show immense potential for therapeutic applications and seem highly effective in cancer treatment. A couple of experiments have been conducted preclinically to investigate the possibility of indole alkaloids in cancer treatment. Marine-derived indole alkaloids possess the ability to exhibit anticancer properties through diverse antiproliferative mechanisms. Certain indole alkaloids, including vincristine and vinblastine, were verified in clinical trials or are presently undergoing clinical assessments for preventing and treating cancer. Indole alkaloids from marine resources hold a significant functionality in identifying new antitumor agents. The current literature highlights recent advancements in indole alkaloids that appear to be anticancer agents and the underlying mechanisms.
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Affiliation(s)
- Fahadul Islam
- Department of Pharmacy, Faculty of Allied Health Sciences, Daffodil International University, Dhaka, 1207, Bangladesh
| | - Zerrouki Dehbia
- Laboratory of Agro - Biotechnology and Nutrition in Semi-Arid Zones, Faculty of Nature and Life Sciences, University of Ibn Khaldoun, Tiaret, Algeria
| | - Mehrukh Zehravi
- Department of Clinical Pharmacy Girls Section, Prince Sattam Bin Abdul Aziz University, Al-Kharj, 11942, Saudi Arabia
| | - Rajib Das
- Department of Pharmacy, Faculty of Pharmacy, University of Dhaka, Dhaka, 1000, Bangladesh
| | - M Sivakumar
- Department of Pharmacognosy, Faculty of Pharmacy, Sree Balaji Medical College and Hospital BIHER (DU), Chromepet, Chennai, 600044, India
| | - Karthickeyan Krishnan
- Department of Pharmacy Practice, School of Pharmaceutical Sciences, Vels Institute of Science, Technology and Advanced Studies (VISTAS), Pallavaram, Chennai, 600117, India
| | - Abdul Ajeed Mohathasim Billah
- Department of Pharmacy Practice, Sri Ramachandra Faculty of Pharmacy, SRIHER (DU), Porur, Chennai, Tamil Nadu, India
| | - Bharadhan Bose
- Department of Pharmacognosy, Karpagam College of Pharmacy, Coimbatore, Tamil Nadu, India
| | - Avoy Ghosh
- Department of Pharmacy, Faculty of Pharmacy, University of Dhaka, Dhaka, 1000, Bangladesh
| | - Shyamjit Paul
- Department of Pharmacy, Faculty of Pharmacy, University of Dhaka, Dhaka, 1000, Bangladesh
| | - Firzan Nainu
- Department of Pharmacy, Faculty of Pharmacy, Hasanuddin University, Makassar, 90245, Indonesia
| | - Irfan Ahmad
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Khalid University, Abha, Saudi Arabia
| | - Talha Bin Emran
- Department of Pharmacy, Faculty of Allied Health Sciences, Daffodil International University, Dhaka, 1207, Bangladesh; Department of Pathology and Laboratory Medicine, Warren Alpert Medical School & Legorreta Cancer Center, Brown University, Providence, RI, 02912, USA.
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Pradeepa S, Sutharthani K, Subadevi R, Sivakumar M. Exploration, of magnetic sesquioxide nanocomposite as a potential electrode material for the fabrication of high energy density asymmetric supercapacitors. J Electroanal Chem (Lausanne) 2023. [DOI: 10.1016/j.jelechem.2022.117043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Soori A, Sivakumar M, Subrahmanyam V. Transmission across non-HermitianPT-symmetric quantum dots and ladders. J Phys Condens Matter 2022; 35:055301. [PMID: 36395507 DOI: 10.1088/1361-648x/aca3ec] [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] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Accepted: 11/17/2022] [Indexed: 06/16/2023]
Abstract
A non-Hermitian (NH) region connected to semi-infinite Hermitian lattices acts either as a source or as a sink and the probability current is not conserved in a scattering typically. Even aPT-symmetric region that contains both a source and a sink does not lead to current conservation plainly. We propose a model and study the scattering across a NHPT-symmetric two-level quantum dot (QD) connected to two semi-infinite one-dimensional lattices in a special way so that the probability current is conserved. Aharonov-Bohm type phases are included in the model, which arise from magnetic fluxes (ℏϕL/e, ℏϕR/e) through two loops in the system. We show that whenϕL=ϕR, the probability current is conserved. We find that the transmission across the QD can be perfect in thePT-unbroken phase (corresponding to real eigenenergies of the isolated QD) whereas the transmission is never perfect in thePT-broken phase (corresponding to purely imaginary eigenenergies of the QD). The two transmission peaks have the same width only for special values of the fluxes (being odd multiples ofπℏ/2e). In the broken phase, the transmission peak is surprisingly not at zero energy. We give an insight into this feature through a four-site toy model. We extend the model to aPT-symmetric ladder connected to two semi-infinite lattices. We show that the transmission is perfect in unbroken phase of the ladder due to Fabry-Pérot type interference, that can be controlled by tuning the chemical potential. In the broken phase of the ladder, the transmission is substantially suppressed.
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Affiliation(s)
- Abhiram Soori
- School of Physics, University of Hyderabad, C. R. Rao Road, Gachibowli, Hyderabad 500046, India
| | - M Sivakumar
- School of Physics, University of Hyderabad, C. R. Rao Road, Gachibowli, Hyderabad 500046, India
| | - V Subrahmanyam
- School of Physics, University of Hyderabad, C. R. Rao Road, Gachibowli, Hyderabad 500046, India
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Iyahraja S, Selwin Rajadurai J, Sivakumar M, N. Lenin N. Investigation on silver-water nanofluid for development of new viscosity correlation. B CHEM SOC ETHIOPIA 2022. [DOI: 10.4314/bcse.v37i2.18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
ABSTRACT. The present study addresses an experimental investigation on the influence of the concentration of nanoparticles and temperature on nanofluid's viscosity and establishes a numerical correlation for predicting the nanofluid's viscosity. In this study, silver nanoparticles (Ag) with a size of 20 nm were used to prepare the nanofluid with water as the base fluid. The concentrations of silver nanoparticles were fixed as 0.01, 0.05, and 0.1% by volume in the range of temperature from 20 to 60oC. The findings of the current investigations report that the nanofluid's viscosity increases with volume fractions of nanoparticles and decreases as the temperature increases. The theoretical correlations in the literature under predict the viscosity of silver-water nanofluids, which has led to the development of a new relationship for determining the nanofluids' effective viscosity from the experimental findings of this research. The proposed model as outcome of the current investigation confirms a reasonable agreement with the experimental data.
KEY WORDS: Silver nanoparticles, Nanofluid, Viscosity, Volume Concentration, Temperature
Bull. Chem. Soc. Ethiop. 2023, 37(2), 505-514.
DOI: https://dx.doi.org/10.4314/bcse.v37i2.18
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Sivakumar M. Reaction and Kinetic Studies of Immobilized Enzyme Systems: Part-I Without External Mass Transfer Resistance. INT J ELECTROCHEM SC 2022. [DOI: 10.20964/2022.09.69] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Kouthaman M, Kannan K, Subadevi R, Sivakumar M. Study on the effect of co-substitution of transition metals on O3-type Na-Mn-Ni-O cathode materials for promising sodium-ion batteries. J Taiwan Inst Chem Eng 2022. [DOI: 10.1016/j.jtice.2022.104565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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Venkataramanan K, Kannan P, Sivakumar M. Optimal sizing method with sensitivity analysis for hybrid energy storage system in electric vehicle using hybrid technique. IFS 2022. [DOI: 10.3233/jifs-222503] [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: 11/15/2022]
Abstract
This manuscript proposes a hybrid method for optimum sizing and energy management (EM) of hybrid energy storage systems (HESSs) in Electric vehicle (EV). The proposed hybrid method is combined performance of Honey Badger Algorithm (HBA) and recalling-enhanced recurrent neural network (RERNN), commonly called HBA-RERNN method. The major objective of proposed system is reducing the vehicle life time cost. The HESSs are incorporated with battery and super capacitor (SC). The proposed method is utilized to solve combined energy management and optimization size. Based on the variables, such as size of battery pack and super capacitor pack, HESS size is reflected. Depend on various sensitivity factors, the analysis of optimum hybrid energy storage systems size and financial costs are performed. At last, the performance of proposed system is implemented on MATLAB site and likened with several existing systems. From this simulation outcome, it concludes that the proposed system diminishes the overall cost and battery degradation cost as 66625 USD than the existing systems. The efficiency of the proposed system achieves 94.8763% .
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Affiliation(s)
- K. Venkataramanan
- Department of Electrical and Electronics Engineering, Vivekanandha College of Engineering for Women (Autonomous), Tiruchengode, Tamilnadu, India
| | - P. Kannan
- Department of Electrical and Electronics Engineering, Vivekanandha College of Engineering for Women, Tiruchengode, Namakkal, Tamilnadu, India
| | - M. Sivakumar
- Department of Electrical Engineering, Engineering, University of Technology and Applied Sciences-Nizwa, Sultanate of Oman
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10
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Sivakumar M. Reaction and Kinetics Studies of Immobilized Enzyme Systems: PartII With External Mass Transfer Resistance. INT J ELECTROCHEM SC 2022. [DOI: 10.20964/2022.10.43] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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11
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Carter J, Ito K, Thodima V, Sivakumar M, Hulse M, Rager J, Vykuntam K, Bhagwat N, Vaddi K, Ruggeri B, Scherle P. Abstract 2159: PRMT5 inhibitor PRT543 displays potent antitumor activity in U2AF1S34F and RBM10LOF spliceosome-mutant non-small cell lung cancer in vitro and in vivo. Cancer Res 2022. [DOI: 10.1158/1538-7445.am2022-2159] [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: 11/16/2022]
Abstract
Abstract
PRMT5 (protein arginine methyltransferase 5) is a major Type II PRMT, which catalyzes the symmetric dimethylation of protein arginine residues (sDMA). As an epigenetic regulator, PRMT5 plays essential roles in promoting cancer growth and survival, including through mechanisms that control alternative splicing and RNA processing, and the expression of DNA damage repair genes. Spliceosome mutations have been suggested to represent a potential biomarker for PRMT5 inhibitors, and our previous work highlighted this sensitivity in SF3B1R625C/G expressing uveal melanoma cells. Here, we highlight in vitro and in vivo activity of PRT543, a potent, selective, and orally available PRMT5 inhibitor, in cancer cells harboring mutations in other spliceosome factors such as U2 small nuclear RNA auxiliary factor 1 (U2AF1) and RNA binding motif protein 10 (RBM10). Mutations in U2AF1 (including S34F hotspot mutations) and RBM10 (primarily loss of function (LOF) mutations) occur in 5-10% of all non-small cell lung cancers (NSCLC). Cell proliferation (10-day assay) was assessed in a panel of NSCLC cell lines treated with PRT543, either wild-type or harboring U2AF1S34F or RBM10LOF mutations. Strikingly, both U2AF1S34F and RBM10LOF cell lines were significantly more sensitive to PRT543 compared to wild-type cell lines. Furthermore, PRT543 induced significant dose-related tumor growth inhibition at well-tolerated doses in cell-line derived xenograft (CDX) models harboring the U2AF1S34F or RBM10LOF mutation. Consistent with our previous findings in other tumor types, PRT543 decreased expression of DNA damage repair-associated genes (e.g. BRCA1, RAD51AP1, FANCA, and FANCL) in U2AF1S34F or RBM10LOF mutant NSCLC cells. Combination with PRT543 increased the effectiveness of specific chemotherapeutic agents in both in vitro and in vivo (CDX) models of U2AF1S34F and RBM10LOF NSCLC. Efficacy studies in patient-derived xenograft (PDX) models, as well as genomic profiling of spliceosome-mutant cellular models in response to PRT543 are ongoing. PRT543 is currently under evaluation in a Phase I clinical trial in patients with advanced solid tumors and hematological malignancies (NCT03886831).
Citation Format: Jack Carter, Koichi Ito, Venkat Thodima, Monisha Sivakumar, Michael Hulse, Joseph Rager, Komali Vykuntam, Neha Bhagwat, Kris Vaddi, Bruce Ruggeri, Peggy Scherle. PRMT5 inhibitor PRT543 displays potent antitumor activity in U2AF1S34F and RBM10LOF spliceosome-mutant non-small cell lung cancer in vitro and in vivo [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2022; 2022 Apr 8-13. Philadelphia (PA): AACR; Cancer Res 2022;82(12_Suppl):Abstract nr 2159.
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Affiliation(s)
- Jack Carter
- 1Prelude Therapeutics Incorporated, Wilmington, DE
| | - Koichi Ito
- 1Prelude Therapeutics Incorporated, Wilmington, DE
| | | | | | | | - Joseph Rager
- 1Prelude Therapeutics Incorporated, Wilmington, DE
| | | | - Neha Bhagwat
- 1Prelude Therapeutics Incorporated, Wilmington, DE
| | - Kris Vaddi
- 1Prelude Therapeutics Incorporated, Wilmington, DE
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Hulse M, Agarwal A, Wang M, Carter J, Sivakumar M, Vidal B, Brown J, Moore A, Grego A, Bhagwat N, Rager J, Lu L, Basch C, Bersch K, Dai C, Pitis P, Combs A, Ruggeri B, Vaddi K, Scherle P, Ito K. Abstract 3263: Preclinical characterization of PRT3789, a potent and selective SMARCA2 targeted degrader. Cancer Res 2022. [DOI: 10.1158/1538-7445.am2022-3263] [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: 11/16/2022]
Abstract
Abstract
SWI/SNF complexes play an important role in controlling gene expression by remodeling chromatin. SMARCA2 (BRM) and SMARCA4 (BRG1) are the core catalytic subunits of the SWI/SNF complexes, containing an ATPase domain and a DNA binding bromodomain. SMARCA4 protein expression is lost in some cancers due to nonsense mutations, and SMARCA4-deleted cancer cells are highly dependent on its paralog gene SMARCA2 for their survival. Therefore, targeting SMARCA2 in SMARCA4-deleted cancers using selective SMARCA2 degraders induces synthetic lethality while sparing SMARCA4 wild type (WT) normal cells. We have identified PRT3789, a potent and selective SMARCA2 targeted degrader, that selectively inhibits proliferation of SMARCA4-deleted cancer cells. Here, we describe the potential mechanism of action for PRT3789 at the molecular level and the in vitro and in vivo anti-tumor activity in SMARCA4-deleted cancer cells. To further elucidate the SMARCA2 degradation selectivity of PRT3789, we performed mass spectrometry to identify the selective SMARCA2 lysine residues ubiquitinated following treatment with PRT3789. This data, in combination with site-directed mutagenesis against these SMARCA2-specific ubiquitinated residues, has revealed important insights into the mechanism of action of PRT3789. In addition, to further understand the specific vulnerability of SMARCA2 in SMARCA4-deleted cells, we investigated whether PRT3789 affected the integrity of the residual SWI/SNF complex. Coimmunoprecipitation of SMARCC1 revealed that PRT3789 disrupts specific SWI/SNF complex subunits, including ACTL6A (BAF53). Functional genome-wide experiments are ongoing to evaluate the impact of this finding and the residual activity of the SWI/SNF complex. Furthermore, treatment with PRT3789 demonstrated robust inhibition of cell proliferation of SMARCA4-deleted non-small cell lung cancer (NSCLC) cells in vitro and NSCLC PDX tumors ex vivo, but not SMARCA4 WT cancer cells, in a concentration-dependent manner. Lastly, PRT3789 shows favorable pharmacokinetic properties in vivo, which correlate to its pharmacodynamics effects as evidenced by reduced SMARCA2 protein and KRT80 mRNA levels in tumor tissues. In subcutaneous cell-line derived xenograft (CDX) models of NSCLC, administration of PRT3789 demonstrated significant dose-related inhibition of SMARCA4-deleted NSCLC growth at tolerated doses, but no effect on the growth of SMARCA4 WT cancers. In summary, consistent with our previous validation studies and genomic perturbation analyses, our potent and selective SMARCA2 targeted degrader PRT3789 induces strong synthetic lethality in SMARCA4-deleted cancers in vitro and in vivo.
Citation Format: Michael Hulse, Anjana Agarwal, Min Wang, Jack Carter, Monisha Sivakumar, Brian Vidal, Justin Brown, Andrew Moore, Alexander Grego, Neha Bhagwat, Joseph Rager, Liang Lu, Corey Basch, Klare Bersch, Chaofeng Dai, Philip Pitis, Andrew Combs, Bruce Ruggeri, Kris Vaddi, Peggy Scherle, Koichi Ito. Preclinical characterization of PRT3789, a potent and selective SMARCA2 targeted degrader [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2022; 2022 Apr 8-13. Philadelphia (PA): AACR; Cancer Res 2022;82(12_Suppl):Abstract nr 3263.
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Affiliation(s)
| | | | - Min Wang
- 1Prelude Therapeutics, Wilmington, DE
| | | | | | | | | | | | | | | | | | - Liang Lu
- 1Prelude Therapeutics, Wilmington, DE
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Sinha SK, Dasgupta A, Sivakumar M, Ghosh C, Raju S. Unraveling the Complexity of Nano-Dispersoids in the Oxide Dispersion Strengthened Alloy 617. Microsc Microanal 2022; 28:1-9. [PMID: 35616077 DOI: 10.1017/s143192762200071x] [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] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Nanocrystalline oxides are mainly responsible for Ni-base oxide dispersion strengthened (ODS) superalloys excellent thermo-mechanical properties. To establish the microstructural correlations between the metallic matrix and various oxide dispersoids, we report here the atomic-scale structure and chemistry of the complex nano-oxide dispersoids. Ultrahigh-resolution Cs-aberration-corrected scanning transmission electron microscopy (STEM) based techniques have been used to resolve nano-dispersoids in the Alloy 617 ODS. These nano-oxides, interestingly, possess a variety of high-angle annular dark-field (HAADF) contrasts, that is, bright, dark, and bi-phases. Both the light and heavy atoms have been found to be present in Y–Al–O complex-oxide nanostructures in varying quantities and forming a characteristic interface with the metallic matrix. In overcoming the limitation of conventional STEM-HAADF imaging, the integrated differential phase-contrast imaging technique was employed to investigate the oxygen atoms along with other elements in the dispersoids and its interface with the matrix. The most intriguing aspect of the study is the discovery of a few atoms thick Al2O3 interlayer (shell) around a monoclinic Y–Al–O core in the Ni-matrix. On the other hand, when the dispersoid is a hexagonal type Y–Al–O complex, the interface energy is already low, maintaining a semi-coherent interface and it was devoid of a shell.
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Affiliation(s)
- Shyam Kanta Sinha
- Physical Metallurgy Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603 102, India
| | - Arup Dasgupta
- Physical Metallurgy Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603 102, India
- Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400094, India
| | - M Sivakumar
- Physical Metallurgy Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603 102, India
- Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400094, India
| | - Chanchal Ghosh
- Physical Metallurgy Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603 102, India
| | - S Raju
- Physical Metallurgy Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603 102, India
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Kouthaman M, Kannan K, Arjunan P, Subadevi R, Sivakumar M. Layered O3-type Na9/10Cr1/2Fe1/2O2 as new cathode for rechargeable sodium-ion battery. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2021.127929] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Ramachandran M, Subadevi R, Rajkumar P, Muthupradeepa R, Yuvakkumar R, Sivakumar M. Upshot of Concentration of Zirconium (IV) Oxynitrate Hexa Hydrate on Preparation and Analyses of Zirconium Oxide (ZrO₂) Nanoparticles by Modified Co-Precipitation Method. J Nanosci Nanotechnol 2021; 21:5707-5713. [PMID: 33980384 DOI: 10.1166/jnn.2021.19488] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
In the present work, pure nanocrystalline monoclinic Zirconia (ZrO₂) has been successfully synthesized and optimized by the modified co-precipitation method. The concentration of raw material has been optimized with the fixed amount of precipitation agent (Potassium hydroxide KOH). The thermal history of the precursor has been examined through TG/DTA analysis. All the samples are subjected to study the structure, fingerprints of the molecular vibrations, and morphology analyses. The representative sample has been analyzed through Transmission Electron Microscope (TEM) and X-ray Photo Electron Spectroscopy (XPS) analyses. The as-prepared sample exhibits the better crystallinity and surface morphology with lesser particle size (190 nm) when the raw material concentration is 0.2 M. The as-prepared ZrO₂ filler (0, 3, 6, 9, and 12 wt.%) is spread through the enhanced polymer electrolyte P(S-MMA) (27 Wt.%)-LiClO₄ (8 wt.%)-EC + PC (1;1 of 65 wt.%) complex system via solution casting method. The as-synthesized electrolyte films are examined via complex impedance analysis. P(S-MMA) (27 wt.%)-LiCIO₄ (8 wt.%)-EC + PC (1 ;1 of 65 wt.%)-6 wt.% of ZrO₂ shows the high ionic conductivity 2.35 × 10-3 Scm-1. Temperature-dependent ionic conductivity studies obey the non-linear behavior. The enhanced ZrO₂ has been expected to enhance the other electrochemical properties of the lithium secondary battery.
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Affiliation(s)
- M Ramachandran
- #120, Energy Materials Lab, Department of Physics, Science Block, Alagappa University, Karaikudi 630003 Tamil Nadu, India
| | - R Subadevi
- #120, Energy Materials Lab, Department of Physics, Science Block, Alagappa University, Karaikudi 630003 Tamil Nadu, India
| | - P Rajkumar
- #120, Energy Materials Lab, Department of Physics, Science Block, Alagappa University, Karaikudi 630003 Tamil Nadu, India
| | - R Muthupradeepa
- #120, Energy Materials Lab, Department of Physics, Science Block, Alagappa University, Karaikudi 630003 Tamil Nadu, India
| | - R Yuvakkumar
- #120, Energy Materials Lab, Department of Physics, Science Block, Alagappa University, Karaikudi 630003 Tamil Nadu, India
| | - M Sivakumar
- #120, Energy Materials Lab, Department of Physics, Science Block, Alagappa University, Karaikudi 630003 Tamil Nadu, India
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Kannan K, Kouthaman M, Arjunan P, Subadevi R, Sivakumar M. Cobalt substituted layered O3 and P2-type Na-Ti-Ni-Co-O anode materials for emerging sodium-ion batteries. J IND ENG CHEM 2021. [DOI: 10.1016/j.jiec.2021.07.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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17
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Rajasekhar SSSN, Kumar VD, Raveendranath V, Kalayarasan R, Gnanasekaran S, Pottakkat B, Sivakumar M. Advanced training in laparoscopic gastrointestinal surgical procedures using Genelyn ®-embalmed human cadavers: A novel model. J Minim Access Surg 2021; 17:495-501. [PMID: 33605926 PMCID: PMC8486066 DOI: 10.4103/jmas.jmas_152_20] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
Background: Human cadaver is ideal for learning and acquiring new surgical skills. While cadavers preserved using Thiel’s embalming method are commonly used for training in laparoscopic surgery, it is a cumbersome technique. We report our experience of using Genelyn®-embalmed cadavers for training in advanced laparoscopic gastrointestinal procedures. Materials and Methods: A cross-sectional satisfaction survey corresponding to level 1 of the Kirkpatrick model for training evaluation was performed among 19 participants of advanced laparoscopy surgical skills training workshop, in December 2019, using Genelyn®-embalmed cadavers. Visual, haptic and tactile characteristics of the organs and tissues were assessed along with overall satisfaction of the workshop using Likert scale. Results: Five Genelyn®-embalmed cadavers were used for the workshop. All the 19 participants perceived that the cadavers were odourless and allowed adequate insufflation for laparoscopic procedures. Most of the participants(n=16, 84%) agreed that the appearance and tactile fidelity of the solid organs, luminal structures and tissues in Genelyn®-embalmed cadavers were similar to that of a live patient. There was a strong agreement among participants that the workshop will help improve the laparoscopic skills(median Likert score–4). Conclusion: The participants of the surgical skill training workshop felt that the Genelyn®-embalmed cadavers were ideal for use in practicing advanced laparoscopic procedures.
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Affiliation(s)
- S S S N Rajasekhar
- Department of Anatomy, Jawaharlal Institute of Post Graduate Medical Education and Research, Puducherry, India
| | - V Dinesh Kumar
- Department of Anatomy, Jawaharlal Institute of Post Graduate Medical Education and Research, Puducherry, India
| | - V Raveendranath
- Department of Anatomy, Jawaharlal Institute of Post Graduate Medical Education and Research, Puducherry, India
| | - Raja Kalayarasan
- Department of Surgical Gastroenterology, Jawaharlal Institute of Post Graduate Medical Education and Research, Puducherry, India
| | - Senthil Gnanasekaran
- Department of Surgical Gastroenterology, Jawaharlal Institute of Post Graduate Medical Education and Research, Puducherry, India
| | - Biju Pottakkat
- Department of Surgical Gastroenterology, Jawaharlal Institute of Post Graduate Medical Education and Research, Puducherry, India
| | - M Sivakumar
- Department of Anatomy, Jawaharlal Institute of Post Graduate Medical Education and Research, Puducherry, India
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Sivakumar M. Climate services' role in safeguarding pastoral disaster communities. REV SCI TECH OIE 2021; 40:431-438. [PMID: 34542104 DOI: 10.20506/rst.40.2.3235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Climate change due to increasing greenhouse gas (GHG) emissions is one of the most pressing issues facing society on a global scale. The growth of GHG emissions between 2000 and 2010 was higher than in each of the previous three decades, and each of the past four decades has been successively warmer than any preceding decades since 1850. Continued GHG emissions will cause further warming and changes in the climate system. Climate change affects livestock production in multiple ways, both directly and indirectly. Many of the impacts on the livestock sector result from increasing frequency and magnitude of weather and climate extremes such as droughts, flash floods, untimely rains, frost, hail and severe storms. This article describes some of the most vulnerable disaster communities in Asia, Africa, Australia, Europe and South America. It then describes the importance of meteorological information provided by national Meteorological and Hydrological Services to help Veterinary Services support sustainable management of livestock in vulnerable pastoral communities.
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Pinson MR, Chung DD, Adams AM, Scopice C, Payne EA, Sivakumar M, Miranda RC. Extracellular Vesicles in Premature Aging and Diseases in Adulthood Due to Developmental Exposures. Aging Dis 2021; 12:1516-1535. [PMID: 34527425 PMCID: PMC8407878 DOI: 10.14336/ad.2021.0322] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 03/22/2021] [Indexed: 12/12/2022] Open
Abstract
The developmental origins of health and disease (DOHaD) is a paradigm that links prenatal and early life exposures that occur during crucial periods of development to health outcome and risk of disease later in life. Maternal exposures to stress, some psychoactive drugs and alcohol, and environmental chemicals, among others, may result in functional changes in developing fetal tissues, creating a predisposition for disease in the individual as they age. Extracellular vesicles (EVs) may be mediators of both the immediate effects of exposure during development and early childhood as well as the long-term consequences of exposure that lead to increased risk and disease severity later in life. Given the prevalence of diseases with developmental origins, such as cardiovascular disease, neurodegenerative disorders, osteoporosis, metabolic dysfunction, and cancer, it is important to identify persistent mediators of disease risk. In this review, we take this approach, viewing diseases typically associated with aging in light of early life exposures and discuss the potential role of EVs as mediators of lasting consequences.
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Affiliation(s)
- Marisa R Pinson
- Department of Neuroscience and Experimental Therapeutics, Texas A&M University Health Science Center, Bryan, TX 77807, USA
| | - Dae D Chung
- Department of Neuroscience and Experimental Therapeutics, Texas A&M University Health Science Center, Bryan, TX 77807, USA
| | - Amy M Adams
- Department of Neuroscience and Experimental Therapeutics, Texas A&M University Health Science Center, Bryan, TX 77807, USA
| | - Chiara Scopice
- Department of Neuroscience and Experimental Therapeutics, Texas A&M University Health Science Center, Bryan, TX 77807, USA
| | - Elizabeth A Payne
- Department of Neuroscience and Experimental Therapeutics, Texas A&M University Health Science Center, Bryan, TX 77807, USA
| | - Monisha Sivakumar
- Department of Neuroscience and Experimental Therapeutics, Texas A&M University Health Science Center, Bryan, TX 77807, USA
| | - Rajesh C Miranda
- Department of Neuroscience and Experimental Therapeutics, Texas A&M University Health Science Center, Bryan, TX 77807, USA
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Pradeepa SS, Rajkumar P, Diwakar K, Sutharthani K, Subadevi R, Sivakumar M. A Facile One‐Pot Hydrothermal Synthesis of Zn, Mn Co‐Doped NiCo
2
O
4
as an Efficient Electrode for Supercapacitor Applications. ChemistrySelect 2021. [DOI: 10.1002/slct.202101708] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- S. S. Pradeepa
- 120 Energy Materials Lab Department of Physics Science Block Alagappa University Karaikudi 630003 Tamil Nadu India
| | - P. Rajkumar
- 120 Energy Materials Lab Department of Physics Science Block Alagappa University Karaikudi 630003 Tamil Nadu India
| | - K. Diwakar
- 120 Energy Materials Lab Department of Physics Science Block Alagappa University Karaikudi 630003 Tamil Nadu India
| | - K. Sutharthani
- 120 Energy Materials Lab Department of Physics Science Block Alagappa University Karaikudi 630003 Tamil Nadu India
| | - R. Subadevi
- 120 Energy Materials Lab Department of Physics Science Block Alagappa University Karaikudi 630003 Tamil Nadu India
| | - M. Sivakumar
- 120 Energy Materials Lab Department of Physics Science Block Alagappa University Karaikudi 630003 Tamil Nadu India
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Ito K, Carter J, Thodima V, Zhang Y, Sivakumar M, Xu M, Bhagwat N, Rager J, Spruance J, Zhang L, Ruggeri B, Scherle P, Vaddi K. Abstract 1185: PRMT5 inhibition epigenetically regulates DNA damage response pathways in cancer cells and sensitizes to chemotherapy and PARP inhibition. Cancer Res 2021. [DOI: 10.1158/1538-7445.am2021-1185] [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: 11/16/2022]
Abstract
Abstract
Genetic defects of DNA damage response (DDR) pathways in cancer cells induce synthetic lethality with chemotherapy and PARP inhibitors. However, many patients with advanced cancers develop resistance to these therapies mainly due to circumvention and/or restoration of the inactivated DDR genes. In the present study, we demonstrate that pharmacological inhibition of PRMT5, the major type II protein arginine methyltransferase, epigenetically downregulates multiple genes involved in the DDR/DNA replication pathways, resulting in the sensitization of cancer cells to chemotherapy and PARP inhibition. Treatment with C220 or PRT543, potent and selective PRMT5 inhibitors, downregulates expression of DDR genes and/or proteins including BRCA1/2, ATM/ATR, CHK1/2, RAD51, POLD1/3, and PNKP in multiple types of cancer cells in vitro. Mechanistically, PRT543 promotes global alternative splicing (ΔPSI) changes, including intron retention and exon skipping. In particular, PRT543 significantly increases retained intron of POLD1 and PNKP genes, which are downstream of the spliceosome subunit SRSF1, a major protein substrate of PRMT5. Additionally, PRT543 increases intron retention of ATM and ATR genes. For BRCA1/2, CHK1/2 and RAD51, no changes in alternative splicing were observed, suggesting the involvement of other mechanisms such as the CLNS1A/H4R3me2s chromatin regulation pathway. The regulation of the DDR pathway by PRT543 is associated with increased DNA damage as determined by COMET and gamma H2AX analyses. Combining PRT543 with PARP inhibitors or DNA-alkylating agents demonstrates a potent synergistic interaction in both HR proficient and HR deficient cancer cell lines in vitro. Similar combination effects are observed in primary cultures of patient-derived breast cancer and high-grade serous ovarian cancer. Moreover, combination of PRT543 with PARP inhibition effectively inhibits the growth of HCC1569 CDX breast cancer in vivo. Further ex vivo and in vivo combination studies with PRT543 and PARP inhibitors or chemotherapy in genetically defined CDX and PDX models are ongoing. These studies not only reveal a novel mechanism of PRMT5 inhibition, but also suggest beneficial combination effects with other therapies, particularly in patients with tumors that are resistant to therapies that are dependent on DNA damage as their mechanism of action. PRT543 is currently under evaluation in a Phase I clinical trial in patients with advanced solid tumors and hematological malignancies (NCT03886831).
Citation Format: Koichi Ito, Jack Carter, Venkat Thodima, Youyou Zhang, Monisha Sivakumar, Mu Xu, Neha Bhagwat, Joseph Rager, Jacob Spruance, Lin Zhang, Bruce Ruggeri, Peggy Scherle, Kris Vaddi. PRMT5 inhibition epigenetically regulates DNA damage response pathways in cancer cells and sensitizes to chemotherapy and PARP inhibition [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2021; 2021 Apr 10-15 and May 17-21. Philadelphia (PA): AACR; Cancer Res 2021;81(13_Suppl):Abstract nr 1185.
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Affiliation(s)
- Koichi Ito
- 1Prelude Therapeutics Inc., Wilmington, DE
| | | | | | | | | | - Mu Xu
- 2University of Pennsylvania, Philadelphia, PA
| | | | | | | | - Lin Zhang
- 2University of Pennsylvania, Philadelphia, PA
| | | | | | - Kris Vaddi
- 1Prelude Therapeutics Inc., Wilmington, DE
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Ito K, Thodima V, Carter J, Bhagwat N, Sivakumar M, Grego A, Rager J, Terai M, Sato T, Abdel-Wahab O, Ruggeri B, Scherle P, Vaddi K. Abstract 1137: PRMT5 inhibition regulates alternative splicing and DNA damage repair pathways in SF3B1 R625G expressing uveal melanoma cells. Cancer Res 2021. [DOI: 10.1158/1538-7445.am2021-1137] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
PRMT5 (protein arginine methyltransferase 5) is a predominant Type II PRMT that catalyzes symmetric dimethylation of protein arginine residues (sDMA). PRMT5 is overexpressed in many types of cancer and plays roles in multiple essential biological processes to promote cancer growth. Previous studies have shown that PRMT5 is a critical molecule for RNA processing and pre-mRNA splicing. Mechanistically, PRMT5 directly methylates arginine residues of several splicing factors such as Small nuclear ribonucleoprotein (SNRPB and SNRPD3) and Serine and arginine rich splicing factor 1 (SRSF1), which contributes to spliceosome assembly and promotes canonical splicing of many essential genes in cancer cells. In the present study, we examined the effects of PRT543, a potent and selective PRMT5 inhibitor, on alternative splicing in uveal melanoma which frequently express hotspot mutations on Splicing factor 3b subunit 1 (SF3B1). We first confirmed that PRT543-treated MEL202 (SF3B1R625G active mutant) and MEL270 (SF3B1WT) cells show significantly increased global alternative splicing, such as increased retained intron (RI) and skipping exon (SE), determined by delta-PSI (percentage of splice-in) analysis. PRT543 downregulates SF3B1 target genes such as FBXW5, MAP3K7, MBD4 and BRD9 that are associated with increased retention of specific intron sites. Interestingly, downregulation of the SF3B1 target genes are more significant in MEL202 (SF3B1R625G) than MEL270 (SF3B1WT), indicating that PRT543 can regulate the activity of the SF3B1 gain of function mutant. Consistent with previously reported PRMT5 knockout studies in hematological cancer cells, PRT543 also downregulates expression of SRSF1 target genes such as POLD1 and PNKP through increased intron retention in primary and metastatic uveal melanoma cell lines. Furthermore, we uncover that PRT543 strikingly increases retention of a specific intron site of ATM (ex33-34), resulting in a significant reduction of ATM protein levels in PRT543-treated MEL202 and MEL270 cells. Gene set enrichment analysis (GSEA) further reveals that PRT543 significantly and specifically regulates DNA replication and repair pathways in MEL202 cells. Importantly, combining PRT543 with DNA-alkylating agents or PARP inhibitors yields a synergistic reduction in cell viability. In summary, our results suggest that PRMT5 inhibition regulates cancer-associated RNA splicing machinery and the DNA damage response, resulting in synergistic antitumor activity when combined with chemotherapy and/or PARP inhibitors, particularly in cancers with spliceosomal mutations. PRT543 is currently under evaluation in a Phase I clinical trial in patients with advanced solid tumors and hematological malignancies (NCT03886831).
Citation Format: Koichi Ito, Venkat Thodima, Jack Carter, Neha Bhagwat, Monisha Sivakumar, Alexander Grego, Joseph Rager, Mizue Terai, Takami Sato, Omar Abdel-Wahab, Bruce Ruggeri, Peggy Scherle, Kris Vaddi. PRMT5 inhibition regulates alternative splicing and DNA damage repair pathways in SF3B1 R625G expressing uveal melanoma cells [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2021; 2021 Apr 10-15 and May 17-21. Philadelphia (PA): AACR; Cancer Res 2021;81(13_Suppl):Abstract nr 1137.
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Affiliation(s)
- Koichi Ito
- 1Prelude Therapeutics Inc., Wilmington, DE
| | | | | | | | | | | | | | - Mizue Terai
- 2Sidney Kimmel Cancer Center at Thomas Jefferson University, Philadelphia, PA
| | - Takami Sato
- 2Sidney Kimmel Cancer Center at Thomas Jefferson University, Philadelphia, PA
| | | | | | | | - Kris Vaddi
- 1Prelude Therapeutics Inc., Wilmington, DE
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Kannan K, Kouthaman M, Arjunan P, Priyanka V, Subadevi R, Kumaresan L, Sivakumar M. Iron substituted layered P2-type Na1/2Ti6/10Ni3/10Fe1/10O2 as innovative anode material for rechargeable sodium batteries. INORG CHEM COMMUN 2021. [DOI: 10.1016/j.inoche.2020.108383] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Diwakar K, Rajkumar P, Subadevi R, Arjunan P, Sivakumar M. Carbon scaffold VPO4 as an anode for lithium- and sodium-ion batteries. J Solid State Electrochem 2021. [DOI: 10.1007/s10008-020-04893-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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26
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Kouthaman M, Arjunan P, Kannan K, Priyanka V, Subadevi R, Kumaran V, Gnanamuthu RM, Sivakumar M. Enhancing structural stability of layered O3-type Na-Mn-Ni-Cu-O cathode material through copper substitution for sodium batteries. J Taiwan Inst Chem Eng 2020. [DOI: 10.1016/j.jtice.2020.11.032] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Pai P, Gupta A, Mohammed Z, Sivakumar M, Mathew S, Rao S, Varma M, E VK, Mukhopadhyay C. CR-GNB in surgical patients: What's the role of colistin? Int J Infect Dis 2020. [DOI: 10.1016/j.ijid.2020.09.258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Rajkumar P, Diwakar K, Subadevi R, Gnanamuthu RM, Wang FM, Liu WR, Sivakumar M. Graphene sheet-encased silica/sulfur composite cathode for improved cyclability of lithium-sulfur batteries. J Solid State Electrochem 2020. [DOI: 10.1007/s10008-020-04747-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Priyanka V, Savithiri G, Rajkumar P, Meenatchi T, Subadevi R, Sivakumar M. Tweaking the electrochemical activity of maricite NaMnPO4 in sodium batteries using different manganese precursors via polyol method. J SOLID STATE CHEM 2020. [DOI: 10.1016/j.jssc.2020.121551] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Xavier SA, Wahab A, Sivakumar M. Evaluation of Intranasal Administration of Dexmedetomidine during Therapeutic Extraction. JPRI 2020. [DOI: 10.9734/jpri/2020/v32i1830695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Aim: The purpose of this study was to evaluate the effectiveness of intranasal administration of dexmedetomidine during therapeutic extraction.Materials and Methods: The study design is a split mouth double blinded randomized control trial. Patients who visited the department of oral and maxillofacial surgery for the therapeutic extraction of premolars were assessed for enrollment. Each subject participated in two surgical sessions, with the extraction of premolars of the upper and lower quadrant of the same side during a single session. A week later subjects were asked to report back for the extraction of the upper and lower premolar on the contralateral side. The patients were randomized by a computer generated number into two groups. Group A received intranasal dexmedetomidine (100 mcg/ml) and group B received intranasal saline at the first session. An alternate regimen was used during the second session during which group A received intranasal saline and in group B intranasal dexmedetomidine was administered. A mucosal atomization device was used to deliver the drug. Pain from local anesthesia infiltration was rated on the numerical rating scale from 0 (no pain) to 10 (worst pain imaginable). Sedation status was measured using the Observer's Assessment of Sedation. Blood pressure and heart rate of the patient were also monitored.Original Research ArticleXavier et al.; JPRI, 32(18): 112-119, 2020; Article no.JPRI.59782113Results: A total of 14 patients were involved in the study. Observer assessment scale indicated that significant sedation was obtained in group A when compared to group B. Compared to group B there was a significant reduction in heart rate and blood pressure in group A at the end of 10 minutes and 40 minutes. These parameters were normalized to the baseline at the end of 60 minutes. There was no significant difference in pain score noted during the local anesthesia infiltration. None of the patients had bradycardia, hypotension, and respiratory depression in this trial.Conclusion: In this study, we conclude that the intranasal administration of dexmedetomidine controls the patient's fear and anxiety during the therapeutic extraction but not the pain during the administration of local anesthesia.
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Panwar R, Sivakumar M, Menon V, Vairappan B. Changes in the levels of comet parameters before and after fluoxetine therapy in major depression patients. Anat Cell Biol 2020; 53:194-200. [PMID: 32647087 PMCID: PMC7343562 DOI: 10.5115/acb.19.217] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2019] [Revised: 11/28/2019] [Accepted: 12/12/2019] [Indexed: 11/27/2022] Open
Abstract
Major depression belongs to mood disorders and characterized by worthlessness, no interest or happiness in any activity; lasting for atleast two weeks. Etio-pathological changes of major depression include oxidative stress leading to free radical synthesis which causes damage to carbohydrates, proteins, lipids and nucleic acids. Nucleic acid damage can be identified by either single or double strand breaks and for quantitative estimation of the same, neutral or alkaline comet assay is performed. Fluoxetine is the drug of choice for treatment of major depression having antioxidant function. In the current study eighty drug naïve major depression patients were recruited and comet parameters namely total comet length, head diameter and tail length were measured before starting the treatment and after completion of eight week fluoxetine therapy. The levels of comet parameters were higher in females than males suggesting higher prevalence of major depression among females. On categorizing into three age groups, the numbers of major depression patients belonging to 18–30 year age group were higher than 31–40 and 41–50 year age groups. All the parameters of deoxyribonucleic acid damage were reduced after eight week of fluoxetine therapy indicating that fluoxetine has anti-oxidant action along with its antidepressant properties, which cause reversal of oxidative stress induced damage occurring during major depression.
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Affiliation(s)
- Rajeev Panwar
- Department of Anatomy, Shri Sathya Sai Medical College and Research Institute, Nellikuppam, India
| | - M Sivakumar
- Department of Anatomy, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Puducherry, India
| | - Vikas Menon
- Department of Psychiatry, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Puducherry, India
| | - Balasubramaniyan Vairappan
- Department of Biochemistry, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Puducherry, India
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Soori A, Sivakumar M. Nonadiabatic charge pumping across two superconductors connected through a normal metal region by periodically driven potentials. J Phys Condens Matter 2020; 32:365304. [PMID: 32375126 DOI: 10.1088/1361-648x/ab90a9] [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] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Accepted: 05/06/2020] [Indexed: 06/11/2023]
Abstract
Periodically driven systems exhibit resonance when the difference between an excited state energy and the ground state energy is an integer multiple ofℏtimes the driving frequency. On the other hand, when a superconducting phase difference is maintained between two superconductors, subgap states appear which carry a Josephson current. A driven Josephson junction therefore opens up an interesting avenue where the excitations due to applied driving affect the current flowing from one superconductor to the other. Motivated by this, we study charge transport in a superconductor-normal metal-superconductor junction where oscillating potentials are applied to the normal metal region. We find that for small amplitudes of the oscillating potential, driving at one site reverses the direction of current at the superconducting phase differences when difference between the subgap eigenenergies of the undriven Hamiltonian is integer multiple ofℏtimes the driving frequency. For larger amplitudes of oscillating potential, driving at one site exhibits richer features. We show that even when the two superconductors are maintained at same superconducting phase, a current can be driven by applying oscillating potentials to two sites in the normal metal differing by a phase. We find that when there is a nonzero Josephson current in the undriven system, the local peaks and valleys in current of the system driven with an amplitude of oscillating potential smaller than the superconducting gap indicates sharp excitations in the system. In the adiabatic limit, we find that charge transferred in one time period diverges as a powerlaw with pumping frequency when a Josephson current flows in the undriven system. Our calculations are exact and can be applied to finite systems. We discuss possible experimental setups where our predictions can be tested.
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Affiliation(s)
- Abhiram Soori
- School of Physics, University of Hyderabad, C. R. Rao Road, Gachibowli, Hyderabad-500046, India
| | - M Sivakumar
- School of Physics, University of Hyderabad, C. R. Rao Road, Gachibowli, Hyderabad-500046, India
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Krishnaveni K, Subadevi R, Sivakumar M. Graphene oxide-crowned poly(acrylonitrile)/sulfur as a lithium–sulfur battery cathode: performance and characterization. SN Appl Sci 2020. [DOI: 10.1007/s42452-020-2576-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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Radhika G, Subadevi R, Sivakumar M. Sulfur Nested with Mixture of MnO2/AB Composite as Efficient Host for High-Performance Li–S Batteries. J CHEM SCI 2020. [DOI: 10.1007/s12039-020-1755-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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35
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Mohapatra D, Sivakumar M. A review of flaps and their uses in reconstructive surgery. J ANAT SOC INDIA 2020. [DOI: 10.4103/jasi.jasi_65_20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Grace MR, Dhanze H, Pantwane P, Sivakumar M, Gulati BR, Kumar A. Latex agglutination test for rapid on-site serodiagnosis of Japanese encephalitis in pigs using recombinant NS1 antigen. J Vector Borne Dis 2019; 56:105-110. [PMID: 31397385 DOI: 10.4103/0972-9062.263717] [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] [Indexed: 11/04/2022] Open
Abstract
Background & objectives Japanese encephalitis (JE) is a mosquitoe-borne viral zoonotic disease and globally around three billion people are at the risk of disease. The occurrence of JE cases has shown a rising trend during last decade in India. Pig is the amplifying host for JE virus and serves as a suitable sentinel model for the prediction of disease outbreak in humans. The development of a diagnostic test that is suitable for surveillance of JE in pigs is the need of the hour. The existing tests require elaborate laboratory facilities which make their application in rural settings difficult. Therefore, realizing the need for a rapid test, efforts were made to standardize a latex agglutination test (LAT) for serodiagnosis of JE in pigs. Methods Standardization of LAT by physical adsorption of recombinant NS1 (non-structural) protein of JE virus onto latex beads was done by altering six different variables, namely the antigen concentration, sensitization condition, surface blocking agent, blocking condition, particle concentration and reaction time. The standardized latex-protein complex was used for screening 246 pig serum samples under optimal conditions. Results The test was standardized with a diagnostic sensitivity and specificity of 82.24 and 87.83%, respectively. Screening of 246 field pig serum samples using standardized LAT showed a seropositivity of 50.4%. The results were available within 5 min after addition of test serum sample to the sensitized beads. Interpretation & conclusion The findings of the study highlight the potential of LAT as a rapid on-site assay for JE diagnosis in pigs which would aid in predicting JE outbreaks in humans.
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Affiliation(s)
- M R Grace
- Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute, Izatnagar, Uttar Pradesh, India
| | - Himani Dhanze
- Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute, Izatnagar, Uttar Pradesh, India
| | - Pranita Pantwane
- Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute, Izatnagar, Uttar Pradesh, India
| | - M Sivakumar
- Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute, Izatnagar, Uttar Pradesh, India
| | | | - Ashok Kumar
- Indian Council of Agricultural Research, New Delhi, India
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Krishnaveni K, Subadevi R, Sivakumar M, Raja M, Prem Kumar T. Synthesis and characterization of graphene oxide capped sulfur/polyacrylonitrile composite cathode by simple heat treatment. J Sulphur Chem 2019. [DOI: 10.1080/17415993.2019.1582655] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- K. Krishnaveni
- Energy Materials Lab, Department of Physics, Alagappa University, Karaikudi, Tamil Nadu, India
| | - R. Subadevi
- Energy Materials Lab, Department of Physics, Alagappa University, Karaikudi, Tamil Nadu, India
| | - M. Sivakumar
- Energy Materials Lab, Department of Physics, Alagappa University, Karaikudi, Tamil Nadu, India
| | - M. Raja
- Electrochemical Power Systems Division, CSIR-Central Electrochemical Research Institute, Karaikudi, Tamil Nadu, India
| | - T. Prem Kumar
- Electrochemical Power Systems Division, CSIR-Central Electrochemical Research Institute, Karaikudi, Tamil Nadu, India
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Sivakumar M, Dubal ZB, Kumar A, Bhilegaonkar K, Vinodh Kumar OR, Kumar S, Kadwalia A, Shagufta B, Grace MR, Ramees TP, Dwivedi A. Virulent methicillin resistant Staphylococcus aureus (MRSA) in street vended foods. J Food Sci Technol 2019; 56:1116-1126. [PMID: 30956291 DOI: 10.1007/s13197-019-03572-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 12/20/2018] [Accepted: 01/01/2019] [Indexed: 01/21/2023]
Abstract
Street foods are one of the important sources of foodborne infections and Staphylococcus aureus is an important infectious agent transmitted through various sources including street foods. The methicillin-resistant S. aureus (MRSA) are of public health significance, hence the study was taken to assess the street foods as a source of MRSA, for which 430 street vended foods of animal origin (meat, milk, eggs and their products) and associated environmental samples were processed for isolation and characterization. A total of 52 (12.1%) S. aureus were isolated and resistant was observed to oxacillin (36.5%), cefoxitin (25%) and penicillin G (82.7%) by disc diffusion test. On genotypic screening, mecA and blaZ have detected in 17.3% and 69.2% isolates, respectively. The virulence typing identified nuc, coa, clfA, spA, FnbA and enterotoxin A (sea) genes in 100%, 96.2%, 30.8%, 55.8, 50% and 7.7% isolates, respectively. Genetic diversity among the isolates was observed by enterobacterial repetitive intergenic consensus PCR with a D value of 0.77. The presence of virulent MRSA in street vended foods trigger the public health concern and emphasis to educate the consumers and street food vendors about quality and safety of such foods.
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Affiliation(s)
- M Sivakumar
- 1Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, Bareilly, UP 243 122 India
| | - Zunjar B Dubal
- 1Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, Bareilly, UP 243 122 India
| | - Ashok Kumar
- 1Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, Bareilly, UP 243 122 India
| | - Kiran Bhilegaonkar
- 1Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, Bareilly, UP 243 122 India
| | - Obli Rajendran Vinodh Kumar
- 2Division of Epidemiology, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, Bareilly, UP 243 122 India
| | - Suman Kumar
- 1Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, Bareilly, UP 243 122 India
| | - Anukampa Kadwalia
- 1Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, Bareilly, UP 243 122 India
| | - Bi Shagufta
- 1Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, Bareilly, UP 243 122 India
| | - M R Grace
- 1Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, Bareilly, UP 243 122 India
| | - T P Ramees
- 1Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, Bareilly, UP 243 122 India
| | - Anamika Dwivedi
- 1Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, Bareilly, UP 243 122 India
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Jeyarajasekar T, Sivakumar M. ICEBERG Metaphor – A Tool for Healthcare Quality Management Systemic Structure. International Journal of Management Studies 2019. [DOI: 10.18843/ijms/v6i1(7)/15] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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40
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Priyanka V, Savithiri G, Subadevi R, Suryanarayanan V, Sivakumar M. Physicochemical exfoliation of graphene sheets using graphitic carbon nitride. NEW J CHEM 2019. [DOI: 10.1039/c9nj02149c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The development of methods for the synthesis of graphene on a large scale at an affordable cost using less toxic materials has attracted significant interest in recent years.
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Affiliation(s)
- V. Priyanka
- #120
- Energy Materials Lab
- Department of Physics
- Science Block
- Alagappa University
| | - G. Savithiri
- #120
- Energy Materials Lab
- Department of Physics
- Science Block
- Alagappa University
| | - R. Subadevi
- #120
- Energy Materials Lab
- Department of Physics
- Science Block
- Alagappa University
| | - V. Suryanarayanan
- Electro-organic Division
- Central Electrochemical Research Institute
- Karaikudi-630 006
- India
| | - M. Sivakumar
- #120
- Energy Materials Lab
- Department of Physics
- Science Block
- Alagappa University
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Radhika G, Subadevi R, Krishnaveni K, Liu WR, Sivakumar M. Synthesis and Electrochemical Performance of PEG-MnO₂-Sulfur Composites Cathode Materials for Lithium-Sulfur Batteries. J Nanosci Nanotechnol 2018; 18:127-131. [PMID: 29768824 DOI: 10.1166/jnn.2018.14568] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Lithium-Sulfur (Li-S) batteries have been achieved great attention in recent years owing to its high theoretical capacity (1675 mAh/g) and energy density (2600 Wh/kg). PEG embedded MnO2/Sulfur composite was prepared via solid state reaction method. The composite was characterized by Transmission electron microscopy, scanning electron microscopy and X-ray diffractometer. MnO2 effectively suppress the diffusion of polysulfides and add a mechanical strength to the electrode. PEG binds the MnO2 and S, resulting in the minimization of active material loss and improves the electrochemical performance in lithium sulfur batteries. The PEG/MnO2/Sulfur composite exhibits discharge capacity of 647 mAh/g even after 30 cycles with appreciable sustainability. Therefore, the resulting PEG/MnO2/Sulfur composite exhibited as a desirable cathode material for Li-S battery.
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Affiliation(s)
- G Radhika
- Department of Physics, Alagappa University, Karaikudi 630004, Tamil Nadu, India
| | - R Subadevi
- Department of Physics, Alagappa University, Karaikudi 630004, Tamil Nadu, India
| | - K Krishnaveni
- Department of Physics, Alagappa University, Karaikudi 630004, Tamil Nadu, India
| | - Wei-Ren Liu
- Department of Chemical Engineering, Chung Yuan Christian University, Taoyuan City, 32023, Taiwan
| | - M Sivakumar
- Department of Physics, Alagappa University, Karaikudi 630004, Tamil Nadu, India
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Krishnaveni K, Subadevi R, Radhika G, Premkumar T, Raja M, Liu WR, Sivakumar M. Carbon Wrapping Effect on Sulfur/Polyacrylonitrile Composite Cathode Materials for Lithium Sulfur Batteries. J Nanosci Nanotechnol 2018; 18:121-126. [PMID: 29768823 DOI: 10.1166/jnn.2018.14561] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A sulfur-Polyacrylonitrile (PAN)-acetylene black (AB) composite was synthesized via thermal treatment processes. The as-prepared ternary composite was characterized by expending transmission electron microscopy (TEM), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) and electrochemical investigations. The improved electrochemical performance can be attributed to the formation of PAN layer, which can keep a tight contact between carbon and sulfur which leads to improve the conductivity. Moreover, the PAN can also act as a flexible cushion to accommodate volume changes of sulfur cathode as well as a barrier to trap soluble polysulfide intermediates during the charge-discharge process. The PAN-S-AB composite exhibits discharge capacity of 620 mAh/g even after 50 cycles with appreciable sustainability. Therefore, the resulting PAN/S/AB composite exhibited as a desirable cathode material for Li-S battery with great performance.
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Affiliation(s)
- K Krishnaveni
- Energy Materials Lab, School of Physics, Alagappa University, Karaikudi 630004, Tamil Nadu, India
| | - R Subadevi
- Energy Materials Lab, School of Physics, Alagappa University, Karaikudi 630004, Tamil Nadu, India
| | - G Radhika
- Energy Materials Lab, School of Physics, Alagappa University, Karaikudi 630004, Tamil Nadu, India
| | - T Premkumar
- Energy and Power Systems Division, Central Electrochemical Research Institute, Karaikudi 630006, TamilNadu, India
| | - M Raja
- Energy and Power Systems Division, Central Electrochemical Research Institute, Karaikudi 630006, TamilNadu, India
| | - Wei-Ren Liu
- Department of Chemical Engineering, Chung-Yuan Christian University, Chung-Li, Taiwan, 32023, ROC
| | - M Sivakumar
- Energy Materials Lab, School of Physics, Alagappa University, Karaikudi 630004, Tamil Nadu, India
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Dhanalakshmi R, Diwakar K, Rajkumar P, Subadevi R, Liu WR, Sivakumar M. Structural and Morphological Studies on Li₂Fe 0.5Mn 0.5SiO₄/C Composite Synthesized Using Polyvinyl Alcohol for Energy Storage Devices. J Nanosci Nanotechnol 2018; 18:296-300. [PMID: 29768843 DOI: 10.1166/jnn.2018.14573] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In this study, we first focus on effects of PVA surfactant on Li2Fe0.5Mn0.5SiO4/C by using X-ray diffraction, Fourier transform infrared spectroscopy, micro Raman analysis, scanning electron microscope, transmission electron microscope and magnetization measurements. XRD result reveals the formation of new phase (Li2Fe0.5Mn0.5SiO4/C), as a result of embedded carbon, intensity of the peaks was also suppressed. Intensity domination of G-band in micro Raman analysis affirmed that the establishment of graphene formation which was yielded from decomposition of organic materials of both PVA and acetate. Confirmation of Si-O and Si-C bond in the as-prepared material was made by FTIR analyses. A well uniform spherical shaped morphology was observed in both SEM and TEM images. In addition, the TEM picture further demonstrates Li2Fe0.5Mn0.5SiO4/C with average particle size of about 20 nm by PVA introducing.
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Affiliation(s)
- R Dhanalakshmi
- Department of Physics, Alagappa University, Karaikudi 630004, Tamil Nadu, India
| | - K Diwakar
- Department of Physics, Alagappa University, Karaikudi 630004, Tamil Nadu, India
| | - P Rajkumar
- Department of Physics, Alagappa University, Karaikudi 630004, Tamil Nadu, India
| | - R Subadevi
- Department of Physics, Alagappa University, Karaikudi 630004, Tamil Nadu, India
| | - Wei-Ren Liu
- Department of Chemical Engineering, Chung Yuan Christian University, Taoyuan City, 32023, Taiwan
| | - M Sivakumar
- Department of Physics, Alagappa University, Karaikudi 630004, Tamil Nadu, India
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Muthupradeepa R, Sivakumar M, Subadevi R, Suryanarayanan V, Liu WR. Effect of Dispersoid on Sulfonium Ionic Liquid Based Gel Polymer Electrolyte for Lithium Secondary Battery. J Nanosci Nanotechnol 2018; 18:215-222. [PMID: 29768833 DOI: 10.1166/jnn.2018.14601] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The present study emphases on the effect of toting of TiO2 filler on the electrochemical enactment of polymer electrolyte containing PVdF-co-HFP(30) + SEt3TFSI(10) + EC/PC(60) + TiO2(x) wt% (Poly (vinylidene fluoride-co-hexafluoropropylene + Triethylsulfoniumbis(trifluoromethylsulfonyl)imide + Ethylene carbonate/Propylene carbonate (1:1 ratio) + Titanium dioxide) for lithium battery applications. Composite electrolytes with different weight percentages of TiO2 were prepared and characterized by different surface analytical, thermal and electrochemical techniques. With gradual increase of the amount of TiO2 upto 6 wt%, broadening of the prominent peak has been noted, suggesting a decrease in the degree of crystallinity upon the addition of TiO2, as revealed by X-ray diffraction (XRD). Raman and FT-IR studies confirm the presence of various functional groups, present in the matrix. The electrolyte with TiO2 (6 wt%) has maximum stability of 460 °C, as confirmed by thermal analysis. Conductivity of the composite polymer electrolytes increases upto 6 wt% of TiO2 (3.42 × 10-3 S/cm at 303 K) and further addition, causes a dip down in conductivity, indicating an improvement in the ionic conductivity and thermal stability with the incorporation of TiO2 filler. Surface morphologic images show the presence of surface and cavity in the polymer matrix, filled with the filler uniformly. Voltammetric studies confirm the electrochemical stability of films upto 4.62 V. Coin cell containing Li anode and LiFePO4 cathode along with polymer electrolyte/6 wt% TiO2 filler, delivers a first discharge capacity of 145 mAh/g with the working voltage of 3.4 V.
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Affiliation(s)
- R Muthupradeepa
- Energy Materials Lab, School of Physics, Alagappa University, Science Block, Karaikudi 630004, India
| | - M Sivakumar
- Energy Materials Lab, School of Physics, Alagappa University, Science Block, Karaikudi 630004, India
| | - R Subadevi
- Energy Materials Lab, School of Physics, Alagappa University, Science Block, Karaikudi 630004, India
| | - V Suryanarayanan
- Electroorganic Division, CSIR-Central Electrochemical Research Institute, Karaikudi 630006 Tamil Nadu, India
| | - Wei-Ren Liu
- Department of Chemical Engineering, Chung-Yuan Christian University, Chung-Li, Taiwan, 32023, R.O.C
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Ramachandran M, Subadevi R, Liu WR, Sivakumar M. Facile Synthesis and Characterization of ZrO₂ Nanoparticles via Modified Co-Precipitation Method. J Nanosci Nanotechnol 2018; 18:368-373. [PMID: 29768855 DOI: 10.1166/jnn.2018.14562] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The crystalline Zirconium oxide (ZrO2) nano particles were synthesized using optimized content of Zirconium nitrate (Zr(NO3)2·3H2O) with varying KOH concentration (0.5, 1 and 1.5 M) by co-precipitation method. The thermal history of the precursor was carefully analyzed through Thermogravimetric (TG/DTA) measurement. The as prepared samples were characterized to ensure structural, functional, morphological, compositional, chemical composition and band gap by X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR), Laser Raman, scanning electron microscopy (SEM), High resolution Transverse Electron Microscopy (HR-TEM), X-ray photo electron spectroscopy (XPS), EDX, Photo luminescence spectroscopy (PL). The monoclinic structure with space group P21/c has been confirmed from XRD (JCPDS 89-9066). The Zr-O stretching vibration and Zr-O2-Zr bending vibrations were confirmed through FTIR analysis. The well dispersed particles with spherical morphology were confirmed through SEM and TEM analysis. The oxidation states of Zr, O and C were confirmed through XPS analysis. The oxygen vacancies and band gap of the particles were investigated through PL analysis.
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Affiliation(s)
- M Ramachandran
- Department of Physics, Arumugam Pillai Seethai Ammal College, Tiruppattur 630210, Tamil Nadu, India
| | - R Subadevi
- Energy Materials Lab, School of Physics, Alagappa University, Karaikudi 630004, Tamil Nadu, India
| | - Wei-Ren Liu
- Department of Chemical Engineering, Chung-Yuan Christian University, Chung-Li, Taiwan, 32023, ROC
| | - M Sivakumar
- Energy Materials Lab, School of Physics, Alagappa University, Karaikudi 630004, Tamil Nadu, India
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Manikandan P, Aruna G, Balaji S, Sukumar S, Sivakumar M. Evaluation on Effectiveness of Cold-Formed Steel Column with Various Types of Edge Stiffener. Arab J Sci Eng 2017. [DOI: 10.1007/s13369-017-2571-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Anukampa, Shagufta B, Sivakumar M, Kumar S, Agarwal RK, Bhilegaonkar KN, Kumar A, Dubal ZB. Antimicrobial resistance and typing of Salmonella isolated from street vended foods and associated environment. J Food Sci Technol 2017; 54:2532-2539. [PMID: 28740311 DOI: 10.1007/s13197-017-2698-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 03/17/2017] [Accepted: 05/12/2017] [Indexed: 01/22/2023]
Abstract
The present study was carried out to find out the occurrence and types of Salmonella present in street vended foods and associated environment, and their resistance pattern against various antibiotics. About 1075 street vended food and associated environment samples were processed for isolation and confirmation of different Salmonella spp. by targeting gene specific invA gene and serotype specific Sdf I, Via B and Spy genes by PCR. Selected Salmonella isolates were screened for antibiotic resistance by using Baeur-Kirby disk diffusion test. Out of 1075 samples, only 31 (2.88%) isolates could be amplified the invA gene of which 19 could be recovered from meat vendors; 8 from egg vendors while remaining 4 from milk vendors. Though, majority of Salmonella recovered from raw foods the ready-to-eat food like chicken gravy and rasmalai also showed its presence which pose a serious public health threat. Overall, 19, 6 and 1 isolates of S. Typhimurium, S. Enteritidis and S. Typhi could be detected by PCR while remaining 5 isolates could not be amplified suggesting other type of Salmonella. Selected Salmonella isolates were completely resistance to Oxacillin (100%) followed by Cefoxitin (30.43%) and Ampicillin (26.10%). Thus, it is observed that the street vended foods of animal origin and associated environment play an important role in transmission of food borne pathogens including Salmonella.
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Affiliation(s)
- Anukampa
- Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, Bareilly, U.P. 243 122 India
| | - Bi Shagufta
- Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, Bareilly, U.P. 243 122 India
| | - M Sivakumar
- Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, Bareilly, U.P. 243 122 India
| | - Surender Kumar
- Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, Bareilly, U.P. 243 122 India
| | - Rajesh Kumar Agarwal
- Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, Bareilly, U.P. 243 122 India
| | - Kiran Narayan Bhilegaonkar
- Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, Bareilly, U.P. 243 122 India
| | - Ashok Kumar
- Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, Bareilly, U.P. 243 122 India
| | - Zunjar Baburao Dubal
- Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute (IVRI), Izatnagar, Bareilly, U.P. 243 122 India
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Sivakumar M, Balachandran K, Karuppiah K. Bifurcation and spatiotemporal patterns of a density-dependent predator–prey model with Crowley–Martin functional response. INT J BIOMATH 2017. [DOI: 10.1142/s1793524517500796] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
In this paper, we consider a diffusive density-dependent predator–prey model with Crowley–Martin functional responses subject to Neumann boundary condition. We analyze the stability of the positive equilibrium and the existence of spatially homogeneous and inhomogeneous periodic solutions through the distribution of the eigenvalues. The direction and stability of Hopf bifurcation are determined by the normal form theory and the center manifold theory. Finally, numerical simulations are given to verify our theoretical analysis.
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Affiliation(s)
- M. Sivakumar
- DRDO Center for Life Sciences, Bharathiar University, Coimbatore 641046, Tamilnadu, India
| | - K. Balachandran
- Department of Mathematics, Bharathiar University, Coimbatore 641046, Tamilnadu, India
| | - K. Karuppiah
- Department of Mathematics, Bharathiar University, Coimbatore 641046, Tamilnadu, India
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49
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Affiliation(s)
- M. Sivakumar
- Department of Analytical Chemistry; University of Madras; Madras India
| | - S. Rajeswari
- Department of Analytical Chemistry; University of Madras; Madras India
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50
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Affiliation(s)
- M. Sivakumar
- Department of Analytical Chemistry; University of Madras
| | - U. Kamachi Mudali
- Metallurgy Division; Indira Gandhi Centre for Atomic Research; India
| | - S. Rajeswari
- Metallurgy Division; Indira Gandhi Centre for Atomic Research; India
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