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Eravuchira PJ, Banchelli M, D’Andrea C, de Angelis M, Matteini P, Gannot I. Hollow core photonic crystal fiber-assisted Raman spectroscopy as a tool for the detection of Alzheimer's disease biomarkers. JOURNAL OF BIOMEDICAL OPTICS 2020; 25:1-10. [PMID: 32618152 PMCID: PMC7330420 DOI: 10.1117/1.jbo.25.7.077001] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 06/11/2020] [Indexed: 06/11/2023]
Abstract
SIGNIFICANCE Alzheimer's disease (AD) is an irreversible and progressive disorder that damages brain cells and impairs the cognitive abilities of the affected. Developing a sensitive and cost-effective method to detect Alzheimer's biomarkers appears vital in both a diagnostic and therapeutic perspective. AIM Our goal is to develop a sensitive and reliable tool for detection of amyloid β (1-42) peptide (Aβ42), a major AD biomarker, using fiber-enhanced Raman spectroscopy (FERS). APPROACH A hollow core photonic crystal fiber (HCPCF) was integrated with a conventional Raman spectroscopic setup to perform FERS measurements. FERS was then coupled with surface-enhanced Raman spectroscopy (SERS) to further amplify the Raman signal thanks to a combined FERS-SERS assay. RESULTS A minimum 20-fold enhancement of the Raman signal of Aβ42 as compared to a conventional Raman spectroscopy scheme was observed using the HCPCF-based light delivery system. The signal was further boosted by decorating the fiber core with gold bipyramids generating an additional SERS effect, resulting in an overall 200 times amplification. CONCLUSIONS The results demonstrate that the use of an HCPCF-based platform can provide sharp and intense Raman signals of Aβ42, in turn paving the way toward the development of a sensitive label-free detection tool for early diagnosis of AD.
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Affiliation(s)
- Pinkie J. Eravuchira
- Tel Aviv University, Department of Biomedical Engineering, Faculty of Engineering, Tel Aviv, Israel
| | - Martina Banchelli
- Institute of Applied Physics “NelloCarrara,” National Research Council, Sesto Fiorentino, Italy
| | - Cristiano D’Andrea
- Institute of Applied Physics “NelloCarrara,” National Research Council, Sesto Fiorentino, Italy
| | - Marella de Angelis
- Institute of Applied Physics “NelloCarrara,” National Research Council, Sesto Fiorentino, Italy
| | - Paolo Matteini
- Institute of Applied Physics “NelloCarrara,” National Research Council, Sesto Fiorentino, Italy
| | - Israel Gannot
- Tel Aviv University, Department of Biomedical Engineering, Faculty of Engineering, Tel Aviv, Israel
- Johns Hopkins University, Department of Electrical and Computer Engineering, Baltimore, Maryland, United States
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Seo Y, Park KS, Ha T, Kim MK, Hwang YJ, Lee J, Ryu H, Choo H, Chong Y. A Smart Near-Infrared Fluorescence Probe for Selective Detection of Tau Fibrils in Alzheimer's Disease. ACS Chem Neurosci 2016; 7:1474-1481. [PMID: 27576176 DOI: 10.1021/acschemneuro.6b00174] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Development of a novel, tau-selective smart near-infrared fluorescence (NIRF) probe was attempted by combining the previously identified core scaffold 3,5-dimethoxy-N,N-dimethylaniline-4-yl moiety, with the characteristic donor-π-acceptor architecture of the smart NIRF Aβ probes DANIR-2c and MCAAD-3. A series of compounds (2 and 3) were prepared, which were identified as "turn-on" NIRF probes for the visual detection of tau aggregates and Aβ fibrils (λem = 650 nm, Stokes shifts = 70-110 nm). In particular, combination of the 3,5-dimethoxy-N,N-dimethylanilin-4-yl moiety and the donor part of MCAAD-3 endowed the resulting probes, 3g and 3h, with significant selectivity toward tau aggregates (selectivity for tau over Aβ = 5.7 and 3.8); they showed much higher fluorescence intensities upon binding to tau aggregates (FItau = 49 and 108) than when bound to Aβ fibrils (FIAβ = 9 and 28). Quantitative analysis of binding affinities and fluorescence properties of 3g and 3h revealed that microenvironment-sensitive molecular rotor-like behavior, rather than binding affinity to the target, is responsible for their selective turn-on fluorescence detection of tau fibrils. Selective fluorescent labeling of tau fibrils by 3g and 3h was further demonstrated by immunofluorescence staining of human Alzheimer's disease brain sections, which showed colocalization of the probes (3g and 3h) and phosphorylated tau antibody.
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Affiliation(s)
- Yujin Seo
- Department
of Integrative Bioscience and Biotechnology, Bio/Molecular Informatics
Center, Konkuk University, Hwayang-dong, Gwangjin-gu, Seoul 143-701, Korea
| | - Kwang-su Park
- Department
of Integrative Bioscience and Biotechnology, Bio/Molecular Informatics
Center, Konkuk University, Hwayang-dong, Gwangjin-gu, Seoul 143-701, Korea
| | - Taewoong Ha
- Department
of Integrative Bioscience and Biotechnology, Bio/Molecular Informatics
Center, Konkuk University, Hwayang-dong, Gwangjin-gu, Seoul 143-701, Korea
| | - Mi Kyoung Kim
- Department
of Integrative Bioscience and Biotechnology, Bio/Molecular Informatics
Center, Konkuk University, Hwayang-dong, Gwangjin-gu, Seoul 143-701, Korea
| | - Yu Jin Hwang
- Center
for Neuro-Medicine, Korea Institute of Science and Technology, 39-1
Hawolgok-dong, Seoungbuk-gu, Seoul 136-791, Korea
| | - Junghee Lee
- Veteran’s Affairs Boston Healthcare System, Boston, Massachusetts 02130, United States
- Boston
University Alzheimer’s Disease Center and Department of Neurology, Boston University School of Medicine, Boston, Massachusetts 02118, United States
| | - Hoon Ryu
- Center
for Neuro-Medicine, Korea Institute of Science and Technology, 39-1
Hawolgok-dong, Seoungbuk-gu, Seoul 136-791, Korea
- Veteran’s Affairs Boston Healthcare System, Boston, Massachusetts 02130, United States
- Boston
University Alzheimer’s Disease Center and Department of Neurology, Boston University School of Medicine, Boston, Massachusetts 02118, United States
| | - Hyunah Choo
- Center
for Neuro-Medicine, Korea Institute of Science and Technology, 39-1
Hawolgok-dong, Seoungbuk-gu, Seoul 136-791, Korea
- Department
of Biological Chemistry, Korea University of Science and Technology, Youseong-gu, Daejeon 305-350, Korea
| | - Youhoon Chong
- Department
of Integrative Bioscience and Biotechnology, Bio/Molecular Informatics
Center, Konkuk University, Hwayang-dong, Gwangjin-gu, Seoul 143-701, Korea
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