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Marino A, Genchi GG, Sinibaldi E, Ciofani G. Piezoelectric Effects of Materials on Bio-Interfaces. ACS APPLIED MATERIALS & INTERFACES 2017; 9:17663-17680. [PMID: 28485910 DOI: 10.1021/acsami.7b04323] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Electrical stimulation of cells and tissues is an important approach of interaction with living matter, which has been traditionally exploited in the clinical practice for a wide range of pathological conditions, in particular, related to excitable tissues. Standard methods of stimulation are, however, often invasive, being based on electrodes and wires used to carry current to the intended site. The possibility to achieve an indirect electrical stimulation, by means of piezoelectric materials, is therefore of outstanding interest for all the biomedical research, and it emerged in the latest decade as a most promising tool in many bioapplications. In this paper, we summarize the most recent achievements obtained by our group and by others in the exploitation of piezoelectric nanoparticles and nanocomposites for cell stimulation, describing the important implications that these studies present in nanomedicine and tissue engineering. A particular attention will be also dedicated to the physical modeling, which can be extremely useful in the description of the complex mechanisms involved in the mechanical/electrical transduction, yet also to gain new insights at the base of the observed phenomena.
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Affiliation(s)
| | | | | | - Gianni Ciofani
- Department of Mechanical and Aerospace Engineering, Politecnico di Torino , Corso Duca degli Abruzzi 24, 10129 Torino, Italy
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Sheu SY, Schlag EW, Yang DY. A model for ultra-fast charge transport in membrane proteins. Phys Chem Chem Phys 2016; 17:23088-94. [PMID: 26274051 DOI: 10.1039/c5cp01442e] [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
Isolated proteins have recently been observed to transport charge and reactivity over very long distances with extraordinary rates and near perfect efficiencies in spite of their site. This is not the case if the peptide is in water, where the efficiency of charge hopping to the next site is reduced to approximately 2%. Here, water is not an ideal solvent for charge transport. The issue at hand is how to explain such enormous charge transfer quenching in water compared to another typical medium, namely lipid. We performed molecular dynamics simulations to computationally substantiate the novel long-distance charge transfer yield of the polypeptides in lipids. This is characterized by the charge transfer persistent-distance decay constant and not by the rate, which is seldom, if ever, measured and hence not directly addressed here. This model can encompass an extremely wide range of yields over very long distances in peptides in various media. The calculations here demonstrate the good charge transport efficiency in lipids in contrast to the poor efficiency in water. The protein charge transport also exhibits a very strong anisotropic effect in lipids. The peptide secondary structure effect of charge transfer in membranes is analyzed in contrast to that in water. These results suggest that this model can be useful for the prediction of charge transfer efficiency in various environments of interest and indicate that the charge transfer is highly efficient in membrane proteins.
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Affiliation(s)
- Sheh-Yi Sheu
- Department of Life Sciences and Institute of Genome Sciences, and Institute of Biomedical Informatics, National Yang-Ming University, Taipei 112, Taiwan.
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Takahashi S, Homma K, Zhou Y, Nishimura S, Duan C, Chen J, Ahmad A, Cheatham MA, Zheng J. Susceptibility of outer hair cells to cholesterol chelator 2-hydroxypropyl-β-cyclodextrine is prestin-dependent. Sci Rep 2016; 6:21973. [PMID: 26903308 PMCID: PMC4763217 DOI: 10.1038/srep21973] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Accepted: 01/29/2016] [Indexed: 12/19/2022] Open
Abstract
Niemann-Pick type C1 disease (NPC1) is a fatal genetic disorder caused by impaired intracellular cholesterol trafficking. Recent studies reported ototoxicity of 2-hydroxypropyl- β-cyclodextrin (HPβCD), a cholesterol chelator and the only promising treatment for NPC1. Because outer hair cells (OHCs) are the only cochlear cells affected by HPβCD, we investigated whether prestin, an OHC-specific motor protein, might be involved. Single, high-dose administration of HPβCD resulted in OHC death in prestin wildtype (WT) mice whereas OHCs were largely spared in prestin knockout (KO) mice in the basal region, implicating prestin's involvement in ototoxicity of HPβCD. We found that prestin can interact with cholesterol in vitro, suggesting that HPβCD-induced ototoxicity may involve disruption of this interaction. Time-lapse analysis revealed that OHCs isolated from WT animals rapidly deteriorated upon HPβCD treatment while those from prestin-KOs tolerated the same regimen. These results suggest that a prestin-dependent mechanism contributes to HPβCD ototoxicity.
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MESH Headings
- 2-Hydroxypropyl-beta-cyclodextrin
- Animals
- Brain/drug effects
- Brain/metabolism
- Brain/pathology
- Cell Death/drug effects
- Chelating Agents/administration & dosage
- Chelating Agents/adverse effects
- Cholesterol/metabolism
- Disease Susceptibility
- Gene Expression
- Hair Cells, Auditory, Outer/drug effects
- Hair Cells, Auditory, Outer/metabolism
- Hair Cells, Auditory, Outer/pathology
- Hearing Loss, Sensorineural/chemically induced
- Hearing Loss, Sensorineural/genetics
- Hearing Loss, Sensorineural/pathology
- Humans
- Mice
- Mice, Knockout
- Molecular Motor Proteins/deficiency
- Molecular Motor Proteins/genetics
- Neuroprotective Agents/administration & dosage
- Neuroprotective Agents/adverse effects
- Niemann-Pick Disease, Type C/drug therapy
- Niemann-Pick Disease, Type C/genetics
- Niemann-Pick Disease, Type C/metabolism
- Niemann-Pick Disease, Type C/pathology
- Time-Lapse Imaging
- beta-Cyclodextrins/administration & dosage
- beta-Cyclodextrins/adverse effects
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Affiliation(s)
- Satoe Takahashi
- Department of Otolaryngology - Head and Neck Surgery, Feinberg School of Medicine, Northwestern University, Chicago IL 60611, USA
| | - Kazuaki Homma
- Department of Otolaryngology - Head and Neck Surgery, Feinberg School of Medicine, Northwestern University, Chicago IL 60611, USA
- Knowles Hearing Center, Northwestern University, Evanston, IL 60208, USA
| | - Yingjie Zhou
- Department of Communication Sciences and Disorders, Northwestern University, Evanston, IL 60208, USA
| | - Shinichi Nishimura
- Division of Bioinformatics and Chemical Genomics, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, 606-8501, Japan
- Chemical Genomics Research Group, RIKEN Center for Sustainable Resource Science, Wako, Saitama 351-0198, Japan
| | - Chongwen Duan
- Department of Otolaryngology - Head and Neck Surgery, Feinberg School of Medicine, Northwestern University, Chicago IL 60611, USA
| | - Jessie Chen
- Department of Otolaryngology - Head and Neck Surgery, Feinberg School of Medicine, Northwestern University, Chicago IL 60611, USA
| | - Aisha Ahmad
- Department of Communication Sciences and Disorders, Northwestern University, Evanston, IL 60208, USA
| | - Mary Ann Cheatham
- Department of Communication Sciences and Disorders, Northwestern University, Evanston, IL 60208, USA
- Knowles Hearing Center, Northwestern University, Evanston, IL 60208, USA
| | - Jing Zheng
- Department of Otolaryngology - Head and Neck Surgery, Feinberg School of Medicine, Northwestern University, Chicago IL 60611, USA
- Knowles Hearing Center, Northwestern University, Evanston, IL 60208, USA
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