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Marinho MAG, Marques MDS, Cordeiro MF, de Moraes Vaz Batista Filgueira D, Horn AP. Combination of Curcumin and Photodynamic Therapy Based on the Use of Red Light or Near-Infrared Radiation in Cancer: a Systematic Review. Anticancer Agents Med Chem 2022; 22:2985-2997. [PMID: 35469576 DOI: 10.2174/1871520622666220425093657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 01/13/2022] [Accepted: 02/18/2022] [Indexed: 11/22/2022]
Abstract
BACKGROUND Photodynamic therapy (PDT) is a therapeutic intervention that can be applied to the treatment of cancer. The interaction between a photosensitizer (PS), ideal wavelength radiation and tissue molecular oxygen, triggers a series of photochemical reactions that are responsible for the production of reactive oxygen species. These highly reactive species can decrease proliferation and induce tumor cell death. The search for PS of natural origin extracted from plants becomes relevant, as they have photoactivation capacity, preferentially targeting tumor cells and because they do not present any or little toxicity to healthy cells. OBJECTIVE Our work aimed to carry out a qualitative systematic review to investigate the effects of curcumin (CUR), a molecule considered as PS of natural origin, on PDT, using red light or near infrared radiation, in tumor models. METHODS A systematic search was performed in three databases (PubMed, Scopus, and Web of Science) using the PICOT method, retrieving a total of 1,373 occurrences. At the end of the peer screening, using inclusion, exclusion, and eligibility criteria, 25 eligible articles were included in this systematic review. RESULTS CUR, whether in its free state, associated with metal complexes or other PS, and in a nanocarrier system, was considered a relevant PS for PDT using red light or near-infrared against tumoral models in vitro and in vivo, acting by increasing cytotoxicity, inhibiting proliferation, inducing cell death mainly by apoptosis, and changing oxidative parameters. CONCLUSION The results found in this systematic review suggest the potential use of CUR as a PS of natural origin to be applied in PDT against many neoplasms, encouraging further search in the field of PDT against cancer and serving as an investigative basis for upcoming pre-clinical and clinical applications.
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Affiliation(s)
- Marcelo Augusto Germani Marinho
- Programa de Pós-Graduação em Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande-FURG, Rio Grande, RS, 96210-900, Brasil.,Laboratório de Neurociências, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande-FURG, Rio Grande, RS, 96210-900, Brasil.,Laboratório de Cultura Celular, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande-FURG, Rio Grande, RS, 96210-900, Brasil
| | - Magno da Silva Marques
- Programa de Pós-Graduação em Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande-FURG, Rio Grande, RS, 96210-900, Brasil.,Laboratório de Neurociências, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande-FURG, Rio Grande, RS, 96210-900, Brasil
| | - Marcos Freitas Cordeiro
- Programa de Pós-Graduação em Biociências e Saúde, Universidade do Oeste de Santa Catarina-UNOESC, Joaçaba, SC, 89600-000, Brasil
| | - Daza de Moraes Vaz Batista Filgueira
- Programa de Pós-Graduação em Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande-FURG, Rio Grande, RS, 96210-900, Brasil.,Laboratório de Cultura Celular, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande-FURG, Rio Grande, RS, 96210-900, Brasil
| | - Ana Paula Horn
- Programa de Pós-Graduação em Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande-FURG, Rio Grande, RS, 96210-900, Brasil.,Laboratório de Neurociências, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande-FURG, Rio Grande, RS, 96210-900, Brasil
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Photochemical and photocytotoxic evaluation of new Oxovanadium (IV) complexes in photodynamic application. J CHEM SCI 2021. [DOI: 10.1007/s12039-021-01896-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Unraveling the binding mechanism of an Oxovanadium(IV) - Curcumin complex on albumin, DNA and DNA gyrase by in vitro and in silico studies and evaluation of its hemocompatibility. J Inorg Biochem 2021; 221:111402. [PMID: 33975249 DOI: 10.1016/j.jinorgbio.2021.111402] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 02/09/2021] [Accepted: 02/13/2021] [Indexed: 11/20/2022]
Abstract
An oxovanadium(IV) - curcumin based complex, viz. [VO(cur)(2,2´-bipy)(H2O)] where cur is curcumin and bipy is bipyridine, previously synthesized, has been studied for interaction with albumin and DNA. Fluorescence emission spectroscopy was used to evaluate the interaction of the complex with bovine serum albumin (BSA) and the BSA-binding constant (Kb) was calculated to be 2.56 x 105 M-1, whereas a single great-affinity binding site was revealed. Moreover, the hemocompatibility test demonstrated that the complex presented low hemolytic fraction (mostly below 1%), in all concentrations tested (0-250 μΜ of complex, 5% DMSO) assuring a safe application in interaction with blood. The binding of the complex to DNA was also investigated using absorption, fluorescence, and viscometry methods indicating a binding through a minor groove mode. From competitive studies with ethidium bromide the apparent binding constant value to DNA was estimated to be 4.82 x 106 M-1. Stern-Volmer quenching phenomenon gave a ΚSV constant [1.92 (± 0.05) x 104 M-1] and kq constant [8.33 (± 0.2) x 1011 M-1s-1]. Molecular docking simulations on the crystal structure of BSA, calf thymus DNA, and DNA gyrase, as well as pharmacophore analysis for BSA target, were also employed to study in silico the ability of [VO(cur)(2,2´-bipy)(H2O)] to bind to these target bio-macromolecules and explain the observed in vitro activity.
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Sanasam B, Raza MK, Musib D, Pal M, Pal M, Roy M. Photodynamic Applications of New Imidazo[4,5‐f][1,10]phenanthroline Oxidovanadium(IV) Complexes: Synthesis, Photochemical, and Cytotoxic Evaluation. ChemistrySelect 2020. [DOI: 10.1002/slct.202003334] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Bandana Sanasam
- Department of Chemistry National Institute of Technology Manipur Langol 795004, Imphal, Manipur India
| | - Md K. Raza
- Department of Inorganic and Physical Chemistry Indian Institute of Science Bangalore Bangalore 560012 India
| | - Dulal Musib
- Department of Chemistry National Institute of Technology Manipur Langol 795004, Imphal, Manipur India
| | - Maynak Pal
- Department of Chemistry National Institute of Technology Manipur Langol 795004, Imphal, Manipur India
| | - Mrityunjoy Pal
- Department of Chemistry National Institute of Technology Manipur Langol 795004, Imphal, Manipur India
| | - Mithun Roy
- Department of Chemistry National Institute of Technology Manipur Langol 795004, Imphal, Manipur India
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Saha T, Kumar P, Sepay N, Ganguly D, Tiwari K, Mukhopadhyay K, Das S. Multitargeting Antibacterial Activity of a Synthesized Mn 2+ Complex of Curcumin on Gram-Positive and Gram-Negative Bacterial Strains. ACS OMEGA 2020; 5:16342-16357. [PMID: 32685797 PMCID: PMC7364437 DOI: 10.1021/acsomega.9b04079] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2019] [Accepted: 06/16/2020] [Indexed: 05/05/2023]
Abstract
Curcumin is an important molecule with a plethora of pharmacological activities and therapeutic potentials. Despite its efficacy, it remained a potential drug candidate owing to hydrolytic instability and poor aqueous solubility. To overcome the limitations related to low solubility, low bioavailability, and the fact that curcumin is never present in solution as a "single unit", its complex was prepared with MnII with the idea that binding to a metal ion might help to resolve these issues. The complex was characterized by elemental and spectral analysis. The structure of the complex was determined by density functional theory calculations. The complex was stable at physiological buffer conditions, unlike curcumin. It did not have any detrimental effect on mammalian cells. There was a significant enhancement in the antibacterial activity of the complex compared to curcumin against both Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria. It showed a strong affinity for deoxyribonucleic acid (DNA) evident from a high binding constant value with calf thymus DNA and also from the retarded electrophoretic mobility of bacterial plasmid DNA. The complex showed "superoxide dismutase-like" activity leading to the generation of reactive oxygen species (ROS). The complex caused bacterial membrane perturbation evident from calcein leakage assay, which was further corroborated by scanning and transmission electron microscopic experiments. Overall, the present study shows improved stability and antibacterial potency of a nontoxic complex over curcumin. Its multitargeting mode of action such as ROS-production, effective binding with DNA, and permeabilization of bacterial membrane together allows it to be an effective antibacterial agent that could be taken further for therapeutic use against bacterial infections.
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Affiliation(s)
- Tanmoy Saha
- Department
of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Prince Kumar
- School
of Environmental Sciences, Jawaharlal Nehru
University, New Delhi 110067, India
| | - Nayim Sepay
- Department
of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Durba Ganguly
- Department
of Inorganic Chemistry, Indian Association
for the Cultivation of Science, Kolkata 700032, India
| | - Kanchan Tiwari
- School
of Environmental Sciences, Jawaharlal Nehru
University, New Delhi 110067, India
| | - Kasturi Mukhopadhyay
- School
of Environmental Sciences, Jawaharlal Nehru
University, New Delhi 110067, India
| | - Saurabh Das
- Department
of Chemistry, Jadavpur University, Kolkata 700032, India
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Upadhyay A, Gautam S, Ramu V, Kondaiah P, Chakravarty AR. Photocytotoxic cancer cell-targeting platinum(ii) complexes of glucose-appended curcumin and biotinylated 1,10-phenanthroline. Dalton Trans 2020; 48:17556-17565. [PMID: 31748772 DOI: 10.1039/c9dt03490k] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Mixed-ligand platinum(ii) complexes, [Pt(phen)(pacac)](NO3) (1), [Pt(phen)(cur)](NO3) (2), [Pt(bt-phen)(cur)](NO3) (3) and [Pt(phen)(scur)](NO3) (4), where phen is 1,10-phenanthroline, bt-phen is 5-biotin-1,10-phenanthroline, pacac is 1,3-diphenyl-1,3-propanedioate anion, Hcur is curcumin and Hscur is diglucosylcurcumin, were prepared, characterized and their anticancer activity studied. Complexes 2-4 showed absorption bands within 410-430 nm (ε, 2.1 × 104 to 2.8 × 104 M-1 cm-1) in 10% DMSO-DPBS (Dulbecco's phosphate-buffered saline) and emission bands near 530 nm (λex = 410-430 nm) with a fluorescence quantum yield (ΦF) value of ∼0.02. The curcumin complexes showed stability over a study period of 48 h. The photocytotoxicity was studied using human cervical HeLa, human liver HepG2, human breast cancer MDA-MB 231 and human lung adenocarcinoma A549 cancer cells along with human immortalized lung epithelial HPL1D as normal cells. Complexes 2-4 showed apoptotic photo-induced cell death in light of wavelength 400-700 nm (IC50, half maximal inhibitory concentration: 6-28 μM) by reactive oxygen species (ROS), while remaining inactive in the dark (IC50: 43-95 μM). The selectivity of the complexes 3 and 4 was enhanced significantly towards the cancer cells than towards the normal cells, thus making them targeted photochemotherapeutic agents. The ROS formation and mode of cell death were studied from 2',7'-dichlorofluorescein diacetate (DCFDA) and annexin-V/FITC (fluorescein isothiocyanate)-PI assays, respectively. Preferential nuclear and mitochondrial localization was evidenced from inductively coupled plasma mass spectrometry (ICP-MS) studies.
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Affiliation(s)
- Aarti Upadhyay
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India.
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Yang QQ, Farha AK, Kim G, Gul K, Gan RY, Corke H. Antimicrobial and anticancer applications and related mechanisms of curcumin-mediated photodynamic treatments. Trends Food Sci Technol 2020. [DOI: 10.1016/j.tifs.2020.01.023] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Li Y, Xiao P, Huang Z, Chen X, Yan X, Zhai J, Ma Y. Evaluation of curcumin-mediated photodynamic therapy on the reverse of multidrug resistance in tumor cells. RSC Adv 2019; 10:298-306. [PMID: 35492566 PMCID: PMC9047416 DOI: 10.1039/c9ra09996d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Accepted: 12/17/2019] [Indexed: 01/09/2023] Open
Abstract
Curcumin (CUR) possesses photosensitive anti-tumor activity. However, photoactive CUR mainly targets tumor cells sensitive to chemotherapy, whereas the effect on multi-drug resistant cancer cells has not been fully investigated. The study aimed to investigate the anti-tumor activity of CUR on resistant MCF-7/ADM cells and its underlying mechanism providing insights into CUR-mediated PDT and a reference for reversing multidrug resistance. Cell apoptosis and morphological changes were detected by Annexin V-FITC/PI double staining and immunofluorescence, respectively. The apoptosis mechanism of CUR-mediated PDT was investigated by detecting the levels of reactive oxygen species (ROS), mitochondrial membrane potential, and related proteins. MTT and apoptosis results showed that CUR-mediated PDT significantly enhanced cytotoxicity and induced considerable cell apoptosis. After treatment with CUR-mediated PDT, cells became round in shape and shrunk, F-actin was loosely arranged, and the nucleus decreased in size. In addition, the level of ROS increased over time compared to the control and peaked at 6 h. CUR-mediated PDT induced alterations in the mitochondrial membrane potential, increased the release of mitochondrial cytochrome C (Cyt-c), and downregulated caspase-3/7/9, PARP, and P-gp. In conclusion, CUR-PDT induced apoptosis in resistant MCF-7/ADM cells primarily through endogenous mitochondrial apoptosis pathway. Besides apoptosis activation in resistant cells, the reverse of multidrug resistance was ascribed to the downregulation of P-gp expression to a degree. The Apoptosis of resistant tumor cells reduced by curcumin-mediated photodynamic therapy.![]()
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Affiliation(s)
- Ying Li
- School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine No. 232 Waihuan East Road, Panyu District Guangzhou China
| | - Pei Xiao
- School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine No. 232 Waihuan East Road, Panyu District Guangzhou China
| | - Zipeng Huang
- School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine No. 232 Waihuan East Road, Panyu District Guangzhou China
| | - Xinru Chen
- School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine No. 232 Waihuan East Road, Panyu District Guangzhou China
| | - Xia Yan
- School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine No. 232 Waihuan East Road, Panyu District Guangzhou China
| | - Junqiu Zhai
- School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine No. 232 Waihuan East Road, Panyu District Guangzhou China
| | - Yan Ma
- School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine No. 232 Waihuan East Road, Panyu District Guangzhou China
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Mukherjee N, Raghavan A, Podder S, Majumdar S, Kumar A, Nandi D, Chakravarty AR. Photocytotoxic Activity of Copper(II) and Zinc(II) Complexes of Curcumin and (Acridinyl)dipyridophenazine. ChemistrySelect 2019. [DOI: 10.1002/slct.201902281] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Nandini Mukherjee
- Department of Inorganic and Physical ChemistryIndian Institute of Science Sir C.V. Raman Avenue Bangalore 560012 India
| | - Abinaya Raghavan
- Department of BiochemistryIndian Institute of Science Sir C.V. Raman Avenue Bangalore 560012 India
| | - Santosh Podder
- Department of BiochemistryIndian Institute of Science Sir C.V. Raman Avenue Bangalore 560012 India
| | - Shamik Majumdar
- Department of BiochemistryIndian Institute of Science Sir C.V. Raman Avenue Bangalore 560012 India
| | - Arun Kumar
- Department of Inorganic and Physical ChemistryIndian Institute of Science Sir C.V. Raman Avenue Bangalore 560012 India
| | - Dipankar Nandi
- Department of BiochemistryIndian Institute of Science Sir C.V. Raman Avenue Bangalore 560012 India
| | - Akhil R. Chakravarty
- Department of Inorganic and Physical ChemistryIndian Institute of Science Sir C.V. Raman Avenue Bangalore 560012 India
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The progresses in curcuminoids-based metal complexes: especially in cancer therapy. Future Med Chem 2019; 11:1035-1056. [PMID: 31140861 DOI: 10.4155/fmc-2018-0190] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Curcuminoids (CURs), a series of derivatives in turmeric (Curcuma longa), are commonly discovered to control the deterioration of cancers. However, the physiochemical properties and the original side effects of many CURs complexes put barriers in their medical applications. To address them, the investigation of metal-based complexes with CURs is in progress. The complexes were summarized according to articles in recent years. The results showed that the complexes improved the physicochemical properties or therapeutic performances compared with pure CURs. Further, it is possible for the novel complexes to be applied in chemical detecting, paramagnetic-luminescent and bio-imaging fields. Therefore, the formation of the metal-based CURs complexes (MBCCs) is beneficial for the development of CURs especially in medical fields.
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Abstract
Background:
Since the serendipitous discovery of the antitumor activity of cisplatin
there has been a continuous surge in studies aimed at the development of new cytotoxic
metal complexes. While the majority of these complexes have been designed to interact with
nuclear DNA, other targets for anticancer metallodrugs attract increasing interest. In cancer
cells the mitochondrial metabolism is deregulated. Impaired apoptosis, insensitivity to antigrowth
signals and unlimited proliferation have been linked to mitochondrial dysfunction. It
is therefore not surprising that mitochondria have emerged as a major target for cancer therapy.
Mitochondria-targeting agents are able to bypass resistance mechanisms and to (re-) activate
cell-death programs.
Methods:
Web-based literature searching tools such as SciFinder were used to search for reports
on cytotoxic metal complexes that are taken up by the mitochondria and interact with
mitochondrial DNA or mitochondrial proteins, disrupt the mitochondrial membrane potential,
facilitate mitochondrial membrane permeabilization or activate mitochondria-dependent celldeath
signaling by unbalancing the cellular redox state. Included in the search were publications
investigating strategies to selectively accumulate metallodrugs in the mitochondria.
Results:
This review includes 241 references on antimitochondrial metal complexes, the use
of mitochondria-targeting carrier ligands and the formation of lipophilic cationic complexes.
Conclusion:
Recent developments in the design, cytotoxic potency, and mechanistic understanding
of antimitochondrial metal complexes, in particular of cyclometalated Au, Ru, Ir and
Pt complexes, Ru polypyridine complexes and Au-N-heterocyclic carbene and phosphine
complexes are summarized and discussed.
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Affiliation(s)
- Andrea Erxleben
- School of Chemistry, National University of Ireland, Galway, Ireland
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Biswas TK, Yusoff MM, Sarjadi MS, Arshad SE, Musta B, Rahman ML. Ion-imprinted polymer for selective separation of cobalt, cadmium and lead ions from aqueous media. SEP SCI TECHNOL 2019. [DOI: 10.1080/01496395.2019.1575418] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Tapan Kumar Biswas
- Faculty of Industrial Sciences and Technology, Universiti Malaysia Pahang, Kuantan, Malaysia
| | - Mashitah Mohd Yusoff
- Faculty of Industrial Sciences and Technology, Universiti Malaysia Pahang, Kuantan, Malaysia
| | - Mohd Sani Sarjadi
- Faculty of Science and Natural Resources, Universiti Malaysia Sabah, Kota Kinabalu, Malaysia
| | - Sazmal Effendi Arshad
- Faculty of Science and Natural Resources, Universiti Malaysia Sabah, Kota Kinabalu, Malaysia
| | - Baba Musta
- Faculty of Science and Natural Resources, Universiti Malaysia Sabah, Kota Kinabalu, Malaysia
| | - Md Lutfor Rahman
- Faculty of Science and Natural Resources, Universiti Malaysia Sabah, Kota Kinabalu, Malaysia
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Mitochondria localizing high-spin iron complexes of curcumin for photo-induced drug release. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2018.09.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Li Y, Gu Z, Zhang C, Li S, Zhang L, Zhou G, Wang S, Zhang J. Synthesis, characterization and ROS-mediated antitumor effects of palladium(II) complexes of curcuminoids. Eur J Med Chem 2017; 144:662-671. [PMID: 29289889 DOI: 10.1016/j.ejmech.2017.12.027] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Revised: 12/07/2017] [Accepted: 12/07/2017] [Indexed: 10/18/2022]
Abstract
Based on the synthesis of curcumin and its derivatives from aromatic aldehydes, a novel series of palladium(II) complexes with curcumin (or its derivatives) and 2,2'-bipyridine have been synthesized through a directed self-assembly approach that involves spontaneous deprotonation of the curcuminoid ligands in H2O/acetone solution. These complexes have been characterized by 1H (13C) NMR, HRMS and elemental analysis. Crystal structure of 3h has been determined by X-ray diffraction analysis. Their cytotoxicity was tested by MTT. The preliminary results showed that complexes 3d, 3f, 3h have significant inhibition on proliferation of three carcinoma cells such as MCF-7, HeLa and A549 cells, which were more active than cisplatin. Further mechanistic studies indicated that the tested complex 3h arrested the cell cycle in the S phase and can disrupted mitochondrial membrane potential and induced tumor cell apoptosis through reactive oxygen species (ROS)-dependent pathway.
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Affiliation(s)
- Yanci Li
- Key Laboratory of Chemical Biology of Hebei Province, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Ministry of Education, College of Chemistry & Environmental Science, Hebei University, Baoding 071002, China
| | - Zhenyu Gu
- Key Laboratory of Chemical Biology of Hebei Province, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Ministry of Education, College of Chemistry & Environmental Science, Hebei University, Baoding 071002, China
| | - Can Zhang
- Key Laboratory of Chemical Biology of Hebei Province, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Ministry of Education, College of Chemistry & Environmental Science, Hebei University, Baoding 071002, China
| | - Shenghui Li
- Key Laboratory of Chemical Biology of Hebei Province, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Ministry of Education, College of Chemistry & Environmental Science, Hebei University, Baoding 071002, China.
| | - Liang Zhang
- Key Laboratory of Chemical Biology of Hebei Province, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Ministry of Education, College of Chemistry & Environmental Science, Hebei University, Baoding 071002, China
| | - Guoqiang Zhou
- Key Laboratory of Chemical Biology of Hebei Province, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Ministry of Education, College of Chemistry & Environmental Science, Hebei University, Baoding 071002, China.
| | - Shuxiang Wang
- Key Laboratory of Chemical Biology of Hebei Province, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Ministry of Education, College of Chemistry & Environmental Science, Hebei University, Baoding 071002, China
| | - Jinchao Zhang
- Key Laboratory of Chemical Biology of Hebei Province, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Ministry of Education, College of Chemistry & Environmental Science, Hebei University, Baoding 071002, China
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Pröhl M, Bus T, Czaplewska JA, Traeger A, Deicke M, Weiss H, Weigand W, Schubert US, Gottschaldt M. Synthesis and in vitro Toxicity ofd-Glucose andd-Fructose Conjugated Curcumin-Ruthenium Complexes. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600801] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Michael Pröhl
- Laboratory of Organic and Macromolecular Chemistry (IOMC); Friedrich Schiller University Jena; Humboldtstraße 10 07743 Jena Germany
- Jena Center for Soft Matter (JCSM); Friedrich Schiller University Jena; Philosophenweg 7 07743 Jena Germany
| | - Tanja Bus
- Laboratory of Organic and Macromolecular Chemistry (IOMC); Friedrich Schiller University Jena; Humboldtstraße 10 07743 Jena Germany
- Jena Center for Soft Matter (JCSM); Friedrich Schiller University Jena; Philosophenweg 7 07743 Jena Germany
| | - Justyna A. Czaplewska
- Laboratory of Organic and Macromolecular Chemistry (IOMC); Friedrich Schiller University Jena; Humboldtstraße 10 07743 Jena Germany
- Jena Center for Soft Matter (JCSM); Friedrich Schiller University Jena; Philosophenweg 7 07743 Jena Germany
| | - Anja Traeger
- Laboratory of Organic and Macromolecular Chemistry (IOMC); Friedrich Schiller University Jena; Humboldtstraße 10 07743 Jena Germany
- Jena Center for Soft Matter (JCSM); Friedrich Schiller University Jena; Philosophenweg 7 07743 Jena Germany
| | - Michael Deicke
- Institute of Inorganic and Analytical Chemistry; Friedrich Schiller University Jena; Humboldtstraße 8 07743 Jena Germany
| | - Henning Weiss
- Institute of Inorganic and Analytical Chemistry; Friedrich Schiller University Jena; Humboldtstraße 8 07743 Jena Germany
| | - Wolfgang Weigand
- Jena Center for Soft Matter (JCSM); Friedrich Schiller University Jena; Philosophenweg 7 07743 Jena Germany
- Institute of Inorganic and Analytical Chemistry; Friedrich Schiller University Jena; Humboldtstraße 8 07743 Jena Germany
| | - Ulrich S. Schubert
- Laboratory of Organic and Macromolecular Chemistry (IOMC); Friedrich Schiller University Jena; Humboldtstraße 10 07743 Jena Germany
- Jena Center for Soft Matter (JCSM); Friedrich Schiller University Jena; Philosophenweg 7 07743 Jena Germany
| | - Michael Gottschaldt
- Laboratory of Organic and Macromolecular Chemistry (IOMC); Friedrich Schiller University Jena; Humboldtstraße 10 07743 Jena Germany
- Jena Center for Soft Matter (JCSM); Friedrich Schiller University Jena; Philosophenweg 7 07743 Jena Germany
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Mukherjee N, Podder S, Banerjee S, Majumdar S, Nandi D, Chakravarty AR. Targeted photocytotoxicity by copper(II) complexes having vitamin B 6 and photoactive acridine moieties. Eur J Med Chem 2016; 122:497-509. [DOI: 10.1016/j.ejmech.2016.07.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Accepted: 07/03/2016] [Indexed: 11/25/2022]
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Banerjee S, Dixit A, Karande AA, Chakravarty AR. Endoplasmic reticulum targeting tumour selective photocytotoxic oxovanadium(IV) complexes having vitamin-B6 and acridinyl moieties. Dalton Trans 2016; 45:783-96. [PMID: 26645854 DOI: 10.1039/c5dt03412d] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Oxovanadium(iv) complexes of vitamin-B6 Schiff base, viz., [VO(HL(1)/L(2)/L(3))(B)]Cl (), where B is 2,2'-bipyridine (bpy in and ), 11-(9-acridinyl)dipyrido[3,2-a:2',3'-c]phenazine (acdppz in and ), H2L(1)·HCl is 3-hydroxy-5-(hydroxymethyl)-4-(((2-hydroxyphenyl)imino)methyl)-2-methylpyridin-1-ium chloride (in and ), HL(2) is 2-(((2-(1H-imidazol-4-yl)ethyl)imino)methyl)phenol (in ) and HL(3) is 4-(((2-(1H-imidazol-4-yl)ethyl)imino)methyl)-5-(hydroxymethyl)-2-methylpyridin-3-ol (in ) were synthesized, characterized and their cellular uptake, photo-activated cytotoxicity and intracellular localization were studied. Complexes , as the perchlorate salt of , and , as the hexafluorophosphate salt of , were structurally characterized. Vitamin-B6 transporting membrane carrier (VTC) mediated entry into tumour cells in preference to the normal ones seems to be responsible for the higher cellular uptake of the complexes into HeLa and MCF-7 cells over MCF-10A cells. Complexes and having acdppz as the photosensitizer exhibit remarkable photocytotoxicity in these cancer cells giving IC50 of <0.9 μM. The complexes remain non-toxic in the dark. The complexes show photo-induced apoptotic cell death via singlet oxygen ((1)O2) generation. Fluorescence microscopy reveals specific localization of complex to endoplasmic reticulum (ER) and generation of (1)O2 possibly leads to apoptotic cell death by triggering ER stress response (ERSR).
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Affiliation(s)
- Samya Banerjee
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India.
| | - Akanksha Dixit
- Department of Biochemistry, Indian Institute of Science, Bangalore 560012, India.
| | - Anjali A Karande
- Department of Biochemistry, Indian Institute of Science, Bangalore 560012, India.
| | - Akhil R Chakravarty
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India.
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Garai A, Pant I, Banerjee S, Banik B, Kondaiah P, Chakravarty AR. Photorelease and Cellular Delivery of Mitocurcumin from Its Cytotoxic Cobalt(III) Complex in Visible Light. Inorg Chem 2016; 55:6027-35. [DOI: 10.1021/acs.inorgchem.6b00554] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Aditya Garai
- Department
of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - Ila Pant
- Department
of Molecular Reproduction, Development and Genetics, Indian Institute of Science, Bangalore 560012, India
| | - Samya Banerjee
- Department
of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - Bhabatosh Banik
- Department
of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - Paturu Kondaiah
- Department
of Molecular Reproduction, Development and Genetics, Indian Institute of Science, Bangalore 560012, India
| | - Akhil R. Chakravarty
- Department
of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
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21
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Metal complexes of curcumin and curcumin derivatives for molecular imaging and anticancer therapy. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2015.09.001] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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22
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Sarkar T, Butcher RJ, Banerjee S, Mukherjee S, Hussain A. Visible light-induced cytotoxicity of a dinuclear iron(III) complex of curcumin with low-micromolar IC50 value in cancer cells. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2015.09.026] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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23
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Sarkar T, Banerjee S, Mukherjee S, Hussain A. Mitochondrial selectivity and remarkable photocytotoxicity of a ferrocenyl neodymium(iii) complex of terpyridine and curcumin in cancer cells. Dalton Trans 2016; 45:6424-38. [DOI: 10.1039/c5dt04775g] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
A mixed-ligand neodymium(iii) complex of ferrocene appended terpyridine and curcumin targets the mitochondria and shows remarkable visible-light induced cytotoxicity in HeLa and MCF-7 cancer cells while being much less toxic in dark and to MCF-10A normal cells.
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Affiliation(s)
- Tukki Sarkar
- Department of Chemistry
- Handique Girls’ College
- Guwahati 781001
- India
| | - Samya Banerjee
- Department of Inorganic and Physical Chemistry
- Indian Institute of Science
- Bangalore 560 012
- India
| | - Sanjoy Mukherjee
- Department of Inorganic and Physical Chemistry
- Indian Institute of Science
- Bangalore 560 012
- India
| | - Akhtar Hussain
- Department of Chemistry
- Handique Girls’ College
- Guwahati 781001
- India
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24
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Banerjee S, Pant I, Khan I, Prasad P, Hussain A, Kondaiah P, Chakravarty AR. Remarkable enhancement in photocytotoxicity and hydrolytic stability of curcumin on binding to an oxovanadium(IV) moiety. Dalton Trans 2015; 44:4108-22. [PMID: 25623080 DOI: 10.1039/c4dt02165g] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Oxovanadium(IV) complexes of polypyridyl and curcumin-based ligands, viz. [VO(cur)(L)Cl] (1, 2) and [VO(scur)(L)Cl] (3, 4), where L is 1,10-phenanthroline (phen in 1 and 3), dipyrido[3,2-a:2',3'-c]phenazine (dppz in 2 and 4), Hcur is curcumin and Hscur is diglucosylcurcumin, were synthesized and characterized and their cellular uptake, photocytotoxicity, intracellular localization, DNA binding, and DNA photo-cleavage activity studied. Complex [VO(cur)(phen)Cl] (1) has V(IV)N2O3Cl distorted octahedral geometry as evidenced from its crystal structure. The sugar appended complexes show significantly higher uptake into the cancer cells compared to their normal analogues. The complexes are remarkably photocytotoxic in visible light (400-700 nm) giving an IC50 value of <5 μM in HeLa, HaCaT and MCF-7 cells with no significant dark toxicity. The green emission of the complexes was used for cellular imaging. Predominant cytosolic localization of the complexes 1-4 to a lesser extent into the nucleus was evidenced from confocal imaging. The complexes as strong binders of calf thymus DNA displayed photocleavage of supercoiled pUC19 DNA in red light by generating ˙OH radicals as the ROS. The cell death is via an apoptotic pathway involving the ROS. Binding to the VO(2+) moiety has resulted in stability against any hydrolytic degradation of curcumin along with an enhancement of its photocytotoxicity.
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Affiliation(s)
- Samya Banerjee
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India.
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25
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Renfrew AK, Bryce NS, Hambley T. Cobalt(III) Chaperone Complexes of Curcumin: Photoreduction, Cellular Accumulation and Light-Selective Toxicity towards Tumour Cells. Chemistry 2015; 21:15224-34. [DOI: 10.1002/chem.201502702] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2015] [Indexed: 11/09/2022]
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26
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Banerjee S, Chakravarty AR. Metal complexes of curcumin for cellular imaging, targeting, and photoinduced anticancer activity. Acc Chem Res 2015; 48:2075-83. [PMID: 26158541 DOI: 10.1021/acs.accounts.5b00127] [Citation(s) in RCA: 198] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Curcumin is a polyphenolic species. As an active ingredient of turmeric, it is well-known for its traditional medicinal properties. The therapeutic values include antioxidant, anti-inflammatory, antiseptic, and anticancer activity with the last being primarily due to inhibition of the transcription factor NF-κB besides affecting several biological pathways to arrest tumor growth and its progression. Curcumin with all these positive qualities has only remained a potential candidate for cancer treatment over the years without seeing any proper usage because of its hydrolytic instability involving the diketo moiety in a cellular medium and its poor bioavailability. The situation has changed considerably in recent years with the observation that curcumin in monoanionic form could be stabilized on binding to a metal ion. The reports from our group and other groups have shown that curcumin in the metal-bound form retains its therapeutic potential. This has opened up new avenues to develop curcumin-based metal complexes as anticancer agents. Zinc(II) complexes of curcumin are shown to be stable in a cellular medium. They display moderate cytotoxicity against prostate cancer and neuroblastoma cell lines. A similar stabilization and cytotoxic effect is reported for (arene)ruthenium(II) complexes of curcumin against a variety of cell lines. The half-sandwich 1,3,5-triaza-7-phosphatricyclo-[3.3.1.1]decane (RAPTA)-type ruthenium(II) complexes of curcumin are shown to be promising cytotoxic agents with low micromolar concentrations for a series of cancer cell lines. In a different approach, cobalt(III) complexes of curcumin are used for its cellular delivery in hypoxic tumor cells using intracellular agents that reduce the metal and release curcumin as a cytotoxin. Utilizing the photophysical and photochemical properties of the curcumin dye, we have designed and synthesized photoactive curcumin metal complexes that are used for cellular imaging by fluorescence microscopy and damaging the cancer cells on photoactivation in visible light while being minimally toxic in darkness. In this Account, we have made an attempt to review the current status of the chemistry of metal curcumin complexes and present results from our recent studies on curcumin complexes showing remarkable in vitro photocytotoxicity. The undesirable dark toxicity of the complexes can be reduced with suitable choice of the metal and the ancillary ligands in a ternary structure. The complexes can be directed to specific subcellular organelles. Selectivity by targeting cancer cells over normal cells can be achieved with suitable ligand design. We expect that this methodology is likely to provide an impetus toward developing curcumin-based photochemotherapeutics for anticancer treatment and cure.
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Affiliation(s)
- Samya Banerjee
- Department of Inorganic and
Physical Chemistry, Indian Institute of Science, Bengaluru 560012, India
| | - Akhil R. Chakravarty
- Department of Inorganic and
Physical Chemistry, Indian Institute of Science, Bengaluru 560012, India
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27
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Sarkar T, Banerjee S, Hussain A. Remarkable visible light-triggered cytotoxicity of mitochondria targeting mixed-ligand cobalt(iii) complexes of curcumin and phenanthroline bases binding to human serum albumin. RSC Adv 2015. [DOI: 10.1039/c4ra17314g] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Co(iii) complexes of curcumin and phenanthroline bases show remarkable visible-light induced cytotoxicity in HeLa cells but are much less toxic in dark and to normal cells. The complexes bind to HSA with significant affinity.
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Affiliation(s)
- Tukki Sarkar
- Department of Chemistry
- Handique Girls' College
- Guwahati 781001
- India
| | - Samya Banerjee
- Department of Inorganic and Physical Chemistry
- Indian Institute of Science
- Bangalore 560 012
- India
| | - Akhtar Hussain
- Department of Chemistry
- Handique Girls' College
- Guwahati 781001
- India
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28
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Bhattacharyya A, Dixit A, Mitra K, Banerjee S, Karande AA, Chakravarty AR. BODIPY appended copper(ii) complexes of curcumin showing mitochondria targeted remarkable photocytotoxicity in visible light. MEDCHEMCOMM 2015. [DOI: 10.1039/c4md00425f] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
BODIPY-appended copper(ii) complexes of curcumin show a remarkable PDT effect in visible light in HeLa cellsviaapoptosis with mitochondrial localization.
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Affiliation(s)
- Arnab Bhattacharyya
- Department of Inorganic and Physical Chemistry
- Indian Institute of Science
- Bangalore 560012
- India
| | - Akanksha Dixit
- Department of Biochemistry
- Indian Institute of Science
- Bangalore 560012
- India
| | - Koushambi Mitra
- Department of Inorganic and Physical Chemistry
- Indian Institute of Science
- Bangalore 560012
- India
| | - Samya Banerjee
- Department of Inorganic and Physical Chemistry
- Indian Institute of Science
- Bangalore 560012
- India
| | - Anjali A. Karande
- Department of Biochemistry
- Indian Institute of Science
- Bangalore 560012
- India
| | - Akhil R. Chakravarty
- Department of Inorganic and Physical Chemistry
- Indian Institute of Science
- Bangalore 560012
- India
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29
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Sarkar T, Banerjee S, Hussain A. Significant photocytotoxic effect of an iron(iii) complex of a Schiff base ligand derived from vitamin B6and thiosemicarbazide in visible light. RSC Adv 2015. [DOI: 10.1039/c5ra04207k] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
An iron(iii)–Schiff base complex derived from vitamin B6and thiosemicarbazide is significantly photocytotoxic to HeLa cancer cells in visible light (400 nm–700 nm) but non-toxic in the absence of light.
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Affiliation(s)
- Tukki Sarkar
- Department of Chemistry
- Handique Girls' College
- Guwahati 781001
- India
| | - Samya Banerjee
- Department of Inorganic and Physical Chemistry
- Indian Institute of Science
- Bangalore 560 012
- India
| | - Akhtar Hussain
- Department of Chemistry
- Handique Girls' College
- Guwahati 781001
- India
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30
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Banerjee S, Dixit A, Karande AA, Chakravarty AR. Remarkable Selectivity and Photo-Cytotoxicity of an Oxidovanadium(IV) Complex of Curcumin in Visible Light. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402884] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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31
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Balaji B, Balakrishnan B, Perumalla S, Karande AA, Chakravarty AR. Photoactivated cytotoxicity of ferrocenyl-terpyridine oxovanadium(IV) complexes of curcuminoids. Eur J Med Chem 2014; 85:458-67. [PMID: 25113874 DOI: 10.1016/j.ejmech.2014.07.098] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Revised: 07/25/2014] [Accepted: 07/25/2014] [Indexed: 10/25/2022]
Abstract
Oxovanadium(IV) complexes, viz. [VO(Fc-tpy)(Curc)](ClO4) (1), [VO(Fc-tpy)(bDHC)](ClO4) (2), [VO(Fc-tpy)(bDMC)](ClO4) (3) and [VO(Ph-tpy)(Curc)](ClO4) (4), of 4'-ferrocenyl-2,2':6',2″-terpyridine (Fc-tpy) and 4'-phenyl-2,2':6',2″-terpyridine (Ph-tpy) and monoanionic curcumin (Curc), bis-dehydroxycurcmin (bDHC) and bis-demethoxycurcumin (bDMC) were prepared, characterized and their photo-induced DNA cleavage activity and photocytotoxicity in visible light studied. The ferrocenyl complexes 1-3 showed an intense metal-to-ligand charge transfer band near 585 nm in DMF and displayed Fc(+)/Fc and V(IV)/V(III) redox couples near 0.65 V and -1.05 V vs. SCE in DMF-0.1 M TBAP. The complexes as avid binders to calf thymus DNA showed significant photocleavage of plasmid DNA in red light of 647 nm forming OH radicals. The complexes showed photocytotoxicity in HeLa and Hep G2 cancer cells in visible light of 400-700 nm with low dark toxicity. ICP-MS and fluorescence microscopic studies exhibited significant cellular uptake of the complexes within 4 h of treatment with complexes. The treatment with complex 1 resulted in the formation of reactive oxygen species inside the HeLa cells which was evidenced from the DCFDA assay.
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Affiliation(s)
- Babu Balaji
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Sir C.V. Raman Avenue, Bangalore 560012, India
| | - Babita Balakrishnan
- Department of Biochemistry, Indian Institute of Science, Sir C.V. Raman Avenue, Bangalore 560 012, India
| | - Sravanakumar Perumalla
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Sir C.V. Raman Avenue, Bangalore 560012, India
| | - Anjali A Karande
- Department of Biochemistry, Indian Institute of Science, Sir C.V. Raman Avenue, Bangalore 560 012, India.
| | - Akhil R Chakravarty
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Sir C.V. Raman Avenue, Bangalore 560012, India.
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