76
|
Ponraj T, Kannan S. Mitochondrial Dysfunction–Induced Apoptosis in Breast Carcinoma Cells Through pH-Dependent Intracellular Quercetin NDDS of PVPylated-TiO 2NPs. J Glob Oncol 2018. [DOI: 10.1200/jgo.18.86800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Background: The conventional chemotherapy has some noticeable drawbacks, such as lack of specificity, the requirement of high drug-dose, adverse effects, and gradual development of multidrug resistance (MDR), that reduce the efficacy of cancer therapy. Aim: To achieve intracellular drug delivery, strategies for overcoming various biologic barriers from the system level to the organ level, to the cellular level. To win through over these challenges in chemotherapy is to be achieving high drug loading combination with low leakage at physiologic pH, minimal toxicity toward healthy cells, and tunable controlled release at the site of action is an ongoing challenge. Methods: To assist drug delivery, we have prepared PVPylated-TiO2NPs consisting of Qtn with high loading efficiency (26.6% w/w) for NDDS. Qtn-PVPylated-TiO2NPs uptake via endocytosed by cancer cells able to generate intracellular ROS, to decrease the mitochondrial membrane potential loss (Δψm) to release cytochrome- c, Bcl-2 dysregulation into the cytosol and then activating caspase-3 to induce cancer cell apoptosis. Results: These novel nanocombinations can be used to improve cancer nanotherapy by induction of apoptosis in vitro. Analysis at molecular level revealed that Qtn-PVPylated-TiO2NPs nanocombination induced Δψm-mediated apoptotic signaling pathway. Conclusion: To our knowledge, this is a novel report using Qtn-PVPylated-TiO2NPs nanocombinations to study the pH-dependent intracellular NDDS to cancer cells. This new nanoformulations of this study may further advance the use of Qtn-PVPylated-TiO2NPs based nanotherapeutic of biomaterials for various biomedical applications, especially cancer nanotherapy.
Collapse
|
77
|
Meenambal R, Kannan S. Design and structural investigations of Yb 3+ substituted β-Ca 3(PO 4) 2 contrast agents for bimodal NIR luminescence and X-ray CT imaging. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2018; 91:817-823. [PMID: 30033317 DOI: 10.1016/j.msec.2018.06.032] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Revised: 05/02/2018] [Accepted: 06/13/2018] [Indexed: 12/22/2022]
Abstract
The quest for the development of bone substitutes with contrast agents for diagnostic imaging subsists to distinguish synthetic bone from native human tissue. To this aim, ytterbium (Yb3+) substitutions in β-tricalcium phosphate (β-Ca3(PO4)2, β-TCP) as contrast agents has been developed to differentiate implant materials thereby, facilitating as host for bimodal imaging application by means of NIR luminescence and X-ray computed tomography techniques. A facile aqueous chemical precipitation route with the aid of surfactant is used for the synthesis of Yb3+ substitutions in β-Ca3(PO4)2. The characterization results affirms the ability of β-Ca3(PO4)2 to host 4.36 mol% of Yb3+ while the excess Yb3+ crystallizes as YbPO4. The structure refinement results favour the occupancy of Yb3+ at the Ca2+(5) site of β-Ca3(PO4)2. The absorption and photoluminescence spectra in the near infrared region with emission intensity ~1024 nm in the second biological window correspond to 2F5/2 → 2F7/2 transitions of Yb3+. The designed Yb3+ substituted β-Ca3(PO4)2 does not exhibit any toxicity in human osteosarcoma cell lines and delivers an excellent in vitro CT contrast ability allied by the enhanced signal intensity and high X-ray absorption coefficient.
Collapse
|
78
|
Meenambal R, Poojar P, Geethanath S, Anitha TS, Kannan S. Lanthanide phosphate (LnPO 4 ) rods as bio-probes: A systematic investigation on structural, optical, magnetic, and biological characteristics. J Biomed Mater Res B Appl Biomater 2018; 107:1372-1383. [PMID: 30265773 DOI: 10.1002/jbm.b.34229] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2018] [Revised: 08/14/2018] [Accepted: 08/18/2018] [Indexed: 01/11/2023]
Abstract
The proposed work involves an exclusive study on the synthesis protocol, crystal structure analysis, and imaging contrast features of unique lanthanide phosphates (LnPO4 ). XRD and Raman spectra affirmed the ability of the proposed synthesis technique to achieve unique LnPO4 devoid of impurities. The crystal structure analysis confirms the P121/c1 space setting of NdPO4 , EuPO4 , GdPO4 , and TbPO4 that all uniformly crystallizes in monoclinic unit cell. In a similar manner, the tetragonal crystal setting of DyPO4 , ErPO4 , HoPO4 , and YbPO4 that unvaryingly possess the I41/amd space setting is confirmed. Under the same synthesis conditions, the monoclinic (Eu) and tetragonal (Ho) lanthanide phosphates displayed uniform rod-like morphologies. Absorption and luminescence properties of unique LnPO4 were determined. In vitro biological studies demonstrated low toxicity levels of LnPO4 and clearly distinguished fluorescence of TbPO4 and EuPO4 in Y79, retinoblastoma cell lines. The paramagnetic response of GdPO4 , NdPO4 , DyPO4 , TbPO4 , and HoPO4 facilitated excellent magnetic resonance imaging (MRI) contrast features. Meanwhile, GdPO4 , DyPO4 , HoPO4 , and YbPO4 possessing higher X-ray absorption coefficient than clinical contrast Omnipaque™ exhibited high computed tomography (CT) efficiency. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 107B: 1372-1383, 2019.
Collapse
|
79
|
Krishnamoorthy G, Kannan S, Marudhamuthu M. Bioactive compound from Aspergillus terreusDMTMGK004 synergistically contributes towards potential anti-pathogenicity. Lett Appl Microbiol 2018; 67:579-588. [PMID: 30203855 DOI: 10.1111/lam.13071] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Revised: 08/29/2018] [Accepted: 09/01/2018] [Indexed: 12/29/2022]
Abstract
This study focused on the evaluation of fungal compound for their anti-pathogenic potential against respiratory pathogens. Soil samples were collected from various geographical regions in Madurai, fungal strain was isolated and identified as Aspergillus terreusDMTMGK004 (MGK004). Secondary metabolites were extracted and evaluated for antioxidant potential. It exhibited significantly high anti-proliferative property against gastric adenocarcinoma (AGS) cell lines. Antimicrobial activity against Gram positive (Streptococcus pneumoniae) and Gram negative (Klebsiella pneumoniae and Haemophilus influenzae) respiratory pathogens were analysed and the minimum inhibitory concentration (MIC) values were determined. Furthermore, the time-killing assay illustrated that the metabolite eliminates 50% of the vegetative cells within few hours of the treatment. From the spectral data, the major functional groups present in the compound were determined as carbonyl group and phenolic hydroxyl group which contribute towards its bioactivity. The compound significantly depreciates the production of extracellular polysaccharides which results in the weakening of biofilm architecture and resistance towards serum killing and phagocytosis. It also induced cell membrane damage which leads to protein and nucleic acid leakage. Hence, the results of the present study could provide a better insinuation towards the formulation of new drug targeting respiratory pathogens. SIGNIFICANCE AND IMPACT OF THE STUDY: The ubiquitous fungi Aspergillus terreus is well known for its secondary metabolite production. The fungus was evaluated for production of antagonistic molecule to reduce the growth of infectious agents causing respiratory infections. It exhibited the biological means of antioxidant, anti-proliferative and anti-pathogenic compound production. The compound exhibits killing effect against respiratory pathogens within two hours. It induced cell membrane damage leading to protein and nucleic acid leakage. It significantly reduced the production of extracellular polysaccharides. The results provide needed information to design innovative strategies for targeting pathogenic factors of the respiratory pathogens instead of killing it precisely.
Collapse
|
80
|
Deepak Roshan VG, Sinto MS, Thomas S, Kannan S. Cyclin D1 overexpression associated with activation of STAT3 in oral carcinoma patients from South India. J Cancer Res Ther 2018. [PMID: 29516928 DOI: 10.4103/0973-1482.188295] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Background Our previous study showed that overexpression of cyclin D1 protein is associated with poor prognosis in oral squamous cell carcinoma (OSCC) patients. Regarding the alteration in the transactivating pathway regulating cyclin D1 expression is still unclear in OSCC from our population. Objectives The major objective of this study is to understand the alteration associated with the transactivation pathway regulating the cyclin D1 overexpression in OSCC patients from our population. Materials and Methods Alteration in the transactivation pathway regulating cyclin D1 expression was evaluated in tumor sample from OSCC patients. The findings were further validated using in vitro knockdown model in OSCC cell line. Results Results from the patients' samples showed that the Phospho-STAT3 has a significant association with cyclin D1 overexpression in OSCC tumor samples. Further knockdown in vitro studies using SCC66 showed a significant correlation between STAT3 and cyclin D1 in OSCC. Conclusion The results from this study showed that in our population the cyclin D1 overexpression is associated with hyperactivation of STAT3 pathway. Our previous result has shown that the cyclin D1 protein overexpression is associated with poor prognosis in OSCC patients. Hence, STAT3 pathway will be better target for the patients with increased cyclin D1 in OSCC patients from our population.
Collapse
|
81
|
Bhuvanesh A, Jaya Christa S, Kannan S, Karuppasamy Pandiyan M, Gangatharan K. Application of optimization algorithms to generation expansion planning problem. JOURNAL OF INTELLIGENT & FUZZY SYSTEMS 2018. [DOI: 10.3233/jifs-169681] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
82
|
Vats BG, Pius IC, Noronha DM, Kannan S. A novel approach for extraction of plutonium and americium from aqueous complexing media. J Radioanal Nucl Chem 2018. [DOI: 10.1007/s10967-018-5857-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
83
|
Kannan S, Chandran GJ, Balaram P, Chidambaram S, Nair MK. Potential Biological Markers for the Staging of Tumor Progression in Oral Mucosa: A Multivariate Analysis. Int J Biol Markers 2018; 11:67-76. [PMID: 8776606 DOI: 10.1177/172460089601100202] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A recent trend in cancer control programmes is the development of early detection strategies and chemoprevention of premalignant lesions. The present study evaluates the potential of selected markers in the biological staging of tumor progression in oral mucosa for better management of the disease. The expression patterns of various cytokeratin protein types such as 10/11, 13 & 16, 19, 18, 14 and pancytokeratin, involucrin, ras p21, epidermal growth factor (EGF) and its receptor (EGFR) were assessed immunohistochemically in various stages of tumor progression in oral mucosa. Statistical analyses such as the Kruskal-Wallis one-way ANOVA, Spearman's rank correlation and multiple regression analysis were carried out to see which proteins have a significant association with tumor progression in oral mucosa. Statistical analysis showed that the expression patterns of cytokeratin types 10/11, 14 and 19, involucrin and epidermal growth factor were significantly correlated with tumor progression in oral mucosa in both univariate and multivariate analysis. Thus the biological stage of a lesion can be calculated from the multiple regression equation derived for these proteins, which could be more useful in assessing the stage of tumor progression in oral mucosa than histopathological grading.
Collapse
|
84
|
Vasanthavel S, Awasthi S, Dhayalan A, Derby B, Kannan S. Structural, Mechanical, Imaging and in Vitro Evaluation of the Combined Effect of Gd 3+ and Dy 3+ in the ZrO 2-SiO 2 Binary System. Inorg Chem 2018; 57:4602-4612. [PMID: 29620367 DOI: 10.1021/acs.inorgchem.8b00337] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Mechanical strength and biocompatibility are considered the main prerequisites for materials in total hip replacement or joint prosthesis. Noninvasive surgical procedures are necessary to monitor the performance of a medical device in vivo after implantation. To this aim, simultaneous Gd3+ and Dy3+ additions to the ZrO2-SiO2 binary system were investigated. The results demonstrate the effective role of Gd3+ and Dy3+ to maintain the structural and mechanical stability of cubic zirconia ( c-ZrO2) up to 1400 °C, through their occupancy of ZrO2 lattice sites. A gradual tetragonal to cubic zirconia ( t-ZrO2 → c-ZrO2) phase transition is also observed that is dependent on the Gd3+ and Dy3+ content in the ZrO2-SiO2. The crystallization of either ZrSiO4 or SiO2 at elevated temperatures is delayed by the enhanced thermal energy consumed by the excess inclusion of Gd3+ and Dy3+ at c-ZrO2 lattice. The addition of Gd3+ and Dy3+ leads to an increase in the density, elastic modulus, hardness, and toughness above that of unmodified ZrO2-SiO2. The multimodal imaging contrast enhancement of the Gd3+ and Dy3+ combinations were revealed through magnetic resonance imaging and computed tomography contrast imaging tests. Biocompatibility of the Gd3+ and Dy3+ dual-doped ZrO2-SiO2 systems was verified through in vitro biological studies.
Collapse
|
85
|
Begoyan VV, Weseliński ŁJ, Xia S, Fedie J, Kannan S, Ferrier A, Rao S, Tanasova M. Multicolor GLUT5-permeable fluorescent probes for fructose transport analysis. Chem Commun (Camb) 2018; 54:3855-3858. [PMID: 29594264 DOI: 10.1039/c7cc09809j] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The specificity of carbohydrate transporters towards their substrates poses a significant challenge for the development of molecular probes to monitor sugar uptake in cells for biochemical and biomedical applications. Herein we report a new set of coumarin-based fluorescent sugar conjugates applicable for the analysis of fructose uptake due to their free passage through the fructose-specific transporter GLUT5. The reported probes cover a broad range of the fluorescence spectrum providing essential tools for the evaluation of fructose transport capacity in live cells.
Collapse
|
86
|
Wadasadawala T, Parmar V, Sinha S, Mondal M, Jain U, Kannan S, Pathak R, Sarin R. PO-1014: Comparison of subjective and objective assessment of cosmetic outcome following breast brachytherapy. Radiother Oncol 2018. [DOI: 10.1016/s0167-8140(18)31324-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
|
87
|
Kannan S. Asking key questions in the consent process. Anaesthesia 2018. [DOI: 10.1111/anae.14265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
88
|
Vats BG, Das D, Sadhu B, Kannan S, Pius IC, Noronha DM, Sundararajan M, Kumar M. Selective recognition of uranyl ions from bulk of thorium(iv) and lanthanide(iii) ions by tetraalkyl urea: a combined experimental and quantum chemical study. Dalton Trans 2018; 45:10319-25. [PMID: 27241102 DOI: 10.1039/c6dt01191h] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The selective separation of uranyl ions from an aqueous solution is one of the most important criteria for sustainable nuclear energy production. We report herein a known, but unexplored extractant, tetraalkyl urea, which shows supreme selectivity for uranium in the presence of interfering thorium and other lanthanide ions from a nitric acid medium. The structural characterization of the uranyl complex (UO2X2·2L, where X = NO3(-), Cl(-) and Br(-)) by IR, NMR and single crystal X-ray diffraction provides insight into the strong interaction between the uranyl ion and the ligand. The origin of this supreme selectivity for uranyl ions is further supported by electronic structure calculations. Uranyl binding with the extractant is thermodynamically more favourable when compared to thorium and the selectivity is achieved through a combination of electronic and steric effects.
Collapse
|
89
|
Thakur V, Kannan S, Sharma M, Kumar P, Pradhan I. Innovative use of Kesling spring separators: A clinical pearl. INTERNATIONAL JOURNAL OF ORTHODONTIC REHABILITATION 2018. [DOI: 10.4103/ijor.ijor_1_18] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
90
|
Vijayaram S, Kannan S. Probiotics: The marvelous factor and health benefits. BIOMEDICAL AND BIOTECHNOLOGY RESEARCH JOURNAL 2018. [DOI: 10.4103/bbrj.bbrj_87_17] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
91
|
Kalaivani S, Anamiga V, Kannan S. Probing the combined additions of Ca 2+ and PO 43− in the stabilized ZrO 2 polymorph: structural, morphological and mechanical analysis. CrystEngComm 2018. [DOI: 10.1039/c8ce01381k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Selective uptake of Ca2+ at c-ZrO2 lattice: additions beyond critical limit lead to β-Ca3(PO4)2 crystallization in the presence of PO43−.
Collapse
|
92
|
Meenambal R, Kannan S. Cosubstitution of Lanthanides (Gd3+/Dy3+/Yb3+) in β-Ca3(PO4)2 for Upconversion Luminescence, CT/MRI Multimodal Imaging. ACS Biomater Sci Eng 2017; 4:47-56. [DOI: 10.1021/acsbiomaterials.7b00742] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
|
93
|
Kannan S, Kolandaivel P. The inhibitory performance of flavonoid cyanidin-3-sambubiocide against H274Y mutation in H1N1 influenza virus. J Biomol Struct Dyn 2017; 36:4255-4269. [PMID: 29199545 DOI: 10.1080/07391102.2017.1413422] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Oseltamivir (Tamiflu) is the most accepted antiviral drug that targets the neuraminidase (NA) protein to inhibit the viral release from the host cell. Few H1N1 influenza strains with the H274Y mutation creates drug resistance to oseltamivir. In this study, we report that flavonoid cyanidin-3-sambubiocide (C3S) compound acts as a potential inhibitor against H274Y mutation. The drug resistance mechanism and inhibitory activity of C3S and oseltamivir against wild-type (WT) and H274Y mutant-type (MT) have been studied and compared based on the results of molecular docking, molecular dynamics, and quantum chemical methods. Oseltamivir has been found less binding affinity with MT. C3S has more binding affinity with WT and MT proteins. From the dynamical study, the 150th loop of the MT protein has found more deformation than WT. A single H274Y mutation induces the conformational changes in the 150th loop which leads to produce more resistance to oseltamivir. The 150th cavity is more attractive target for C3S to stop the conformational changes in the MT, than 430th cavity of NA protein. The C3S is stabilized with MT by more number of hydrogen bonds than oseltamivir. The electrostatic interaction energy shows a stronger C3S binding with MT and this compound may be more effective against oseltamivir-resistant virus strains.
Collapse
|
94
|
Gatasheh MK, Kannan S, Hemalatha K, Imrana N. Proflavine an acridine DNA intercalating agent and strong antimicrobial possessing potential properties of carcinogen. KARBALA INTERNATIONAL JOURNAL OF MODERN SCIENCE 2017. [DOI: 10.1016/j.kijoms.2017.07.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
|
95
|
Mishra SK, Kannan S. Doxorubicin-Conjugated Bimetallic Silver–Gadolinium Nanoalloy for Multimodal MRI-CT-Optical Imaging and pH-Responsive Drug Release. ACS Biomater Sci Eng 2017; 3:3607-3619. [DOI: 10.1021/acsbiomaterials.7b00498] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
96
|
Sawant SS, Dongre H, Ahire C, Sharma S, Kannan S, Mahadik S, Chaukar D, Lukmani F, Patil A, D'Cruz A, Vaidya MM, Dongre P. Cover Image. Oral Dis 2017. [DOI: 10.1111/odi.12788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
97
|
Murthy V, Munshi M, Kannan S, Bakshi G, Prakash G, Gurav P, Ghonge S, Joshi A, Mahantshetty U. Patient-Reported Outcome Measures With Prostate Only or Whole Pelvic Radiation Therapy in High Risk Prostate Cancer: A Randomized Controlled Trial Data. Int J Radiat Oncol Biol Phys 2017. [DOI: 10.1016/j.ijrobp.2017.06.1215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
98
|
Mahalingam B, Kannan S, Gurusamy V. ENRICHMENT OF ENSEMBLE LEARNING USING K-MODES RANDOM SAMPLING. ICTACT JOURNAL ON SOFT COMPUTING 2017. [DOI: 10.21917/ijsc.2017.0217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
99
|
Mishra SK, Kannan S. A Bimetallic Silver-Neodymium Theranostic Nanoparticle with Multimodal NIR/MRI/CT Imaging and Combined Chemo-photothermal Therapy. Inorg Chem 2017; 56:12054-12066. [PMID: 28933536 DOI: 10.1021/acs.inorgchem.7b02103] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
An engineered metallic nanostructure is an excellent candidate for "theranosis" of cancer, having intrinsic properties of multimodal imaging and therapy. Toward this target, the development of silver-neodymium bimetallic nanoparticles (Ag-Nd BNPs) via microwave-assisted polyol synthesis is presented. The resultant Ag-Nd BNPs exhibit good monodispersity with average size of 10 nm, fluorescence in the near-infrared (NIR) region, and magnetic properties. The Ag-Nd BNPs also validate MRI, CT, and NIR trimodal imaging ability and enunciate valuable temperature response upon irradiation under a NIR laser. Aided by chitosan functionalization on the surface, the Ag-Nd BNPs deliver good biocompatibility and also promote the loading of paclitaxel, an anticancer drug. Isothermal titration calorimetry affirms the combination of strong binding affinity of drug and high loading efficiency of 7 drug molecules per nanoparticle. Moreover, Ag-Nd BNPs also illustrate a highly efficient photothermal effect in PBS. Therefore, the synergistic effects of paclitaxel and the photothermal effect make BNPs excellent "combined therapeutic agents", and also give them the important ability to destroy cancer cells in vitro at very low dose in comparison to single therapy. Thus, the Ag-Nd BNPs unveil a combination of MRI/CT/NIR imaging and chemo-photothermal therapy that ensures accurate diagnosis at an early stage and comprehensive eradication of tumor cells without affecting healthy cells.
Collapse
|
100
|
Ponnilavan V, Poojar P, Geethanath S, Kannan S. Gadolinium Doping in Zirconia-Toughened Alumina Systems and Their Structural, Mechanical, and Aging Behavior Repercussions. Inorg Chem 2017; 56:10998-11007. [PMID: 28846397 DOI: 10.1021/acs.inorgchem.7b01291] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of Gd3+ dopings in zirconia-toughened alumina (ZTA) systems were undertaken to explore the resultant structural, morphological, hydrothermal aging, and mechanical behavior and imaging contrast abilities. The results from the characterization techniques demonstrate the significance of Gd3+ in preserving the structural stability of ZTA systems. ZTA undergoes phase degradation with 10 wt % Gd3+ at 1400 °C, while the 100 wt % Gd3+ yields GdAlO3 even at 1200 °C. Gd3+ doping at the intermediate level preserves the structural stability of ZTA systems until 1400 °C. Gd3+ occupies the ZrO2 lattice, and its gradual accumulation induces tetragonal ZrO2 (t-ZrO2) to cubic ZrO2 (c-ZrO2) phase transition. α-Al2O3 crystallizes at 1200 °C and remains unperturbed except for its reaction with the free Gd3+ ions to yield GdAlO3. Aging studies and mechanical tests signify the impeccable role of Gd3+ in ZTA systems to resist phase degradation. Further, the imaging contrast ability of ZTA systems due to Gd3+ doping is verified from the in vitro magnetic resonance imaging (MRI) tests.
Collapse
|