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Prajapati KP, Anand BG, Ansari M, Temgire M, Tiku AB, Kar K. Amyloid-mimicking toxic nanofibers generated via self-assembly of dopamine. Nanoscale 2022; 14:8649-8662. [PMID: 35667124 DOI: 10.1039/d1nr07741d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Molecular self-assembly of biologically relevant aromatic metabolites is known to generate cytotoxic nanostructures and this unique property has opened up new concepts in the molecular mechanisms of metabolite-linked disorders. Because aromaticity is intrinsic to the chemical structure of some important neuromodulators, the question of whether this property can promote their self-assembly into toxic higher order structures is highly relevant to the advancement of both fundamental and applied research. We show here that dopamine, an aromatic neuromodulator of high significance, undergoes self-assembly, under physiological buffer conditions, yielding cytotoxic supramolecular nanostructures. The oxidation of dopamine seems crucial in driving the self-assembly, and substantial inhibition effect was observed in the presence of antioxidants and acidic buffers. Strong H-bonds and π-π interactions between optimally-oriented dopamine molecules were found to stabilize the dopamine nanostructure which displayed characteristic β-structure-patterns with hydrophobic exterior and hydrophilic interior moieties. Furthermore, dopamine nanostructures were found to be highly toxic to human neuroblastoma cells, revealing apoptosis and necrosis-mediated cytotoxicity. Abnormal fluctuation in the dopamine concentration is known to predispose a multitude of neuronal complications, hence, the new findings of this study on oxidation-driven buildup of amyloid-mimicking neurotoxic dopamine assemblies may have direct relevance to the molecular origin of several dopamine related disorders.
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Affiliation(s)
| | | | - Masihuzzaman Ansari
- School of Life Sciences, Jawaharlal Nehru University, New Delhi-110067, India.
| | - Mayur Temgire
- Department of Chemical Engineering, Indian Institution of Technology Bombay, Powai, Mumbai, 400076, India
| | - Ashu Bhan Tiku
- School of Life Sciences, Jawaharlal Nehru University, New Delhi-110067, India.
| | - Karunakar Kar
- School of Life Sciences, Jawaharlal Nehru University, New Delhi-110067, India.
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Anand BG, Prajapati KP, Ansari M, Yadav DK, Temgire M, Kar K. Genesis of Neurotoxic Hybrid Nanofibers from the Coassembly of Aromatic Amino Acids. ACS Appl Mater Interfaces 2021; 13:36722-36736. [PMID: 34327979 DOI: 10.1021/acsami.1c04161] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Considering the relevance of accumulation and self-assembly of metabolites and aftermath of biological consequences, it is important to know whether they undergo coassembly and what properties the resultant hybrid higher-order structures would exhibit. This work reveals the inherent tendency of aromatic amino acids to undergo a spontaneous coassembly process under physiologically mimicked conditions, which yields neurotoxic hybrid nanofibers. Resultant hybrid nanostructures resembled the β-structured conformers stabilized by H-bonds and π-π stacking interactions, which were highly toxic to human neuroblastoma cells. The hybrid nanofibers also showed strong cross-seeding potential that triggered in vitro aggregation of diverse globular proteins and brain extract components, converting the native structures into cross-β-rich amyloid aggregates. The heterogenic nature of the hybrid nanofibers seems crucial for their higher toxicity and faster cross-seeding potential as compared to the homogeneous amino acid nanofibers. Our findings reveal the importance of aromaticity-driven optimized intermolecular arrangements for the coassembly of aromatic amino acids, and the results may provide important clues to the fundamental understanding of metabolite accumulation-related complications.
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Affiliation(s)
- Bibin Gnanadhason Anand
- Biophysical and Biomaterials Research Laboratory, School of Life Sciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Kailash Prasad Prajapati
- Biophysical and Biomaterials Research Laboratory, School of Life Sciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Masihuzzaman Ansari
- Biophysical and Biomaterials Research Laboratory, School of Life Sciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Deepak Kumar Yadav
- Biophysical and Biomaterials Research Laboratory, School of Life Sciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Mayur Temgire
- Department of Chemical Engineering, Indian Institution of Technology Bombay, Powai, Mumbai 400076, India
| | - Karunakar Kar
- Biophysical and Biomaterials Research Laboratory, School of Life Sciences, Jawaharlal Nehru University, New Delhi 110067, India
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Prajapati KP, Singh AP, Dubey K, Ansari M, Temgire M, Anand BG, Kar K. Myricetin inhibits amyloid fibril formation of globular proteins by stabilizing the native structures. Colloids Surf B Biointerfaces 2020; 186:110640. [DOI: 10.1016/j.colsurfb.2019.110640] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2019] [Revised: 09/19/2019] [Accepted: 11/10/2019] [Indexed: 02/06/2023]
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Prasad R, Chauhan DS, Yadav AS, Devrukhkar J, Singh B, Gorain M, Temgire M, Bellare J, Kundu GC, Srivastava R. A biodegradable fluorescent nanohybrid for photo-driven tumor diagnosis and tumor growth inhibition. Nanoscale 2018; 10:19082-19091. [PMID: 30288516 DOI: 10.1039/c8nr05164j] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Specific targeting and phototriggered therapy in mouse model have recently emerged as the starting point of cancer theragnosis. Herein, we report a bioresponsive and degradable nanohybrid, a liposomal nanohybrid decorated with red emissive carbon dots, for localized tumor imaging and light-mediated tumor growth inhibition. Unsaturated carbon dots (C-dots) anchored to liposomes convert near-infrared (NIR) light into heat and also produce reactive oxygen species (ROS), demonstrating the capability of phototriggered cancer cell death and tumor regression. The photothermal and oxidative damage of breast tumor by the nonmetallic nanohybrid has also been demonstrated. Designed nanoparticles show excellent aqueous dispersibility, biocompatibility, light irradiated enhanced cellular uptake, release of reactive oxygen species, prolonged and specific tumor binding ability and good photothermal response (62 °C in 5 minutes). Safe and localized irradiation of 808 nm light demonstrates significant tumor growth inhibition and bioresponsive degradation of the fluorescent nanohybrid without affecting the surrounding healthy tissues.
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Affiliation(s)
- Rajendra Prasad
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai, India.
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Sagar N, Khanna K, Sardesai VS, Singh AK, Temgire M, Kalita MP, Kadam SS, Soni VP, Bhartiya D, Bellare JR. Bioconductive 3D nano-composite constructs with tunable elasticity to initiate stem cell growth and induce bone mineralization. Mater Sci Eng C Mater Biol Appl 2016; 69:700-14. [PMID: 27612764 DOI: 10.1016/j.msec.2016.07.063] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Revised: 06/23/2016] [Accepted: 07/20/2016] [Indexed: 12/28/2022]
Abstract
Bioactive 3D composites play an important role in advanced biomaterial design to provide molecular coupling and improve integrity with the cellular environment of the native bone. In the present study, a hybrid lyophilized polymer composite blend of anionic charged sodium salt of carboxymethyl chitin and gelatin (CMChNa-GEL) reinforced with nano-rod agglomerated hydroxyapatite (nHA) has been developed with enhanced biocompatibility and tunable elasticity. The scaffolds have an open, uniform and interconnected porous structure with an average pore diameter of 157±30μm and 89.47+0.03% with four dimensional X-ray. The aspect ratio of ellipsoidal pores decrease from 4.4 to 1.2 with increase in gelatin concentration; and from 2.14 to 1.93 with decrease in gelling temperature. The samples were resilient with elastic stain at 1.2MPa of stress also decreased from 0.33 to 0.23 with increase in gelatin concentration. The crosslinker HMDI (hexamethylene diisocyanate) yielded more resilient samples at 1.2MPa in comparison to glutaraldehyde. Increased crosslinking time from 2 to 4h in continuous compression cycle show no improvement in maximum elastic stain of 1.2MPa stress. This surface elasticity of the scaffold enables the capacity of these materials for adherent self renewal and cultivation of the NTERA-2 cL.D1 (NT2/D1), pluripotent embryonal carcinoma cell with biomechanical surface, as is shown here. Proliferation with MG-63, ALP activity and Alizarin red mineralization assay on optimized scaffold demonstrated ***p<0.001 between different time points thus showing its potential for bone healing. In pre-clinical study histological bone response of the scaffold construct displayed improved activity of bone regeneration in comparison to self healing of control groups (sham) up to week 07 after implantation in rabbit tibia critical-size defect. Therefore, this nHA-CMChNa-GEL scaffold composite exhibits inherent and efficient physicochemical, mechanical and biological characteristics based on gel concentrations, gelatin mixing and gelling temperature thus points to creating bioactive 3D scaffolds with tunable elasticity for orthopedic applications.
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Affiliation(s)
- Nitin Sagar
- Department of Biosciences and Bioengineering, Indian Institute of Technology-Bombay, Mumbai 400076, India
| | - Kunal Khanna
- Centre for Research in Nanotechnology and Science, Indian Institute of Technology-Bombay, Mumbai 400076, India
| | - Varda S Sardesai
- National Institute of Research in Reproductive Health, Mumbai 400012, India
| | - Atul K Singh
- Centre for Research in Nanotechnology and Science, Indian Institute of Technology-Bombay, Mumbai 400076, India
| | - Mayur Temgire
- Department of Chemical Engineering, Indian Institute of Technology-Bombay, Mumbai 400076, India
| | - Mridula Phukan Kalita
- Department of Chemical Engineering, Indian Institute of Technology-Bombay, Mumbai 400076, India
| | - Sachin S Kadam
- Department of Chemical Engineering, Indian Institute of Technology-Bombay, Mumbai 400076, India; Krishna Institute of Medical Sciences, Malkapur, Karad 415539, Dist. Satara, Maharashtra, India
| | - Vivek P Soni
- Department of Biosciences and Bioengineering, Indian Institute of Technology-Bombay, Mumbai 400076, India
| | - Deepa Bhartiya
- National Institute of Research in Reproductive Health, Mumbai 400012, India
| | - Jayesh R Bellare
- Department of Biosciences and Bioengineering, Indian Institute of Technology-Bombay, Mumbai 400076, India; Centre for Research in Nanotechnology and Science, Indian Institute of Technology-Bombay, Mumbai 400076, India; Department of Chemical Engineering, Indian Institute of Technology-Bombay, Mumbai 400076, India; Wadhwani Research Center for Bioengineering, Indian Institute of Technology-Bombay, Mumbai 400076, India.
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Borse S, Temgire M, Khan A, Joshi S. Photochemically assisted one-pot synthesis of PMMA embedded silver nanoparticles: antibacterial efficacy and water treatment. RSC Adv 2016. [DOI: 10.1039/c6ra08397h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Achievement of simultaneous reduction of bactericidal silver nanoparticles and in situ polymerization by photo irradiation is beneficial for water treatment.
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Affiliation(s)
- Shubhangi Borse
- Department of Chemistry
- Savitribai Phule Pune University
- (Formerly University of Pune) Ganeshkhind
- Pune 411007
- India
| | - Mayur Temgire
- Department of Chemical Engineering
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
| | - Ayesha Khan
- Department of Chemistry
- Savitribai Phule Pune University
- (Formerly University of Pune) Ganeshkhind
- Pune 411007
- India
| | - Satyawati Joshi
- Department of Chemistry
- Savitribai Phule Pune University
- (Formerly University of Pune) Ganeshkhind
- Pune 411007
- India
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Thawari AG, Hinge VK, Temgire M, Rao CP. Mercuration of apo-α-lactalbumin: binding of Hg2+followed by protein-mediated nanoparticle formation. RSC Adv 2014. [DOI: 10.1039/c4ra07156e] [Citation(s) in RCA: 3] [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: 11/21/2022] Open
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Abstract
Photoluminescence (PL) behavior of ZnSe(1-y)Te(y) quantum dots is investigated by varying Te concentration as well as size. The striking effect of quantum confinement is the observation of isoelectronic center-related emission at room temperature in lieu of near-band-edge emission that dominates the optical scenario. ZnSe(0.99)Te(0.01) quantum dots were also doped by Mn(2+) ions. The Mn(2+) ion-related d-d transition is drastically suppressed by Te isoelectronic centers. Incorporation of Mn(2+) at substitutional sites in ZnSe(0.99)Te(0.01) quantum dots is also confirmed by the electron paramagnetic resonance measurements. Effect of Te isoelectronic impurity on the emission behavior is more pronounced than that of Mn(2+) ions. A subtle blueshift in the orange d-d transition is a sign of a decrease in crystal field strength. PL and photoluminescence excitation measurements on Zn(1-x)Se(0.99)Te(0.01)Mn(x) quantum dots indicate that the transition probability from the lowest unoccupied molecular orbital to Te levels is substantially larger than that to Mn(2+) d-d levels.
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Affiliation(s)
- Kiran G Sonawane
- DST Unit on Nanoscience, Department of Physics, University of Pune, Pune, India
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