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Advances in Molecular and Cellular Imaging, Microscopy, and Biomedical Spectroscopy

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Biophysics".

Deadline for manuscript submissions: 30 June 2024 | Viewed by 2538

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Faculty of Engineering, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan
Interests: fluorescent imaging; raman spectroscopy; nonlinear microscopy; optical biopsy; cancer metastasis; cancer diagnosis; osteoporosis; cartilage degeneration and regeneration
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Special Issue Information

Dear Colleagues,

Optical imaging and spectroscopic techniques are promising tools used to visualize molecular dynamics in living cells, organoids, and tissues in the fields of developmental biology, tissue engineering, immune response, tumorigenesis, and regenerative medicine. Recent advances in laser optics, imaging and microscopic technologies, and molecular probes have drastically improved sensitivity, specificity, time and spatial resolution, penetration dept, etc., for molecular and cellular imaging, microscopy, and biomedical spectroscopy. This Special Issue encourages the publication of methodologies that help to elucidate molecular mechanisms, cellular functions, and tissue morphologies in biological systems with and/or without labeling. Various research themes and topics (including nonlinear optical imaging; multiphoton fluorescence; SHG, THG, CARS, and SRS microscopy; photoacoustic imaging; NIR imaging and spectroscopy; and spontaneous Raman spectroscopy) are very welcome, in combination with modality and molecular sciences.

Dr. Yusuke Oshima
Guest Editor

Manuscript Submission Information

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Published Papers (3 papers)

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Research

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13 pages, 1790 KiB  
Article
Pure-Shift-Based Proton Magnetic Resonance Spectroscopy for High-Resolution Studies of Biological Samples
by Haolin Zhan, Yulei Chen, Yinping Cui, Yunsong Zeng, Xiaozhen Feng, Chunhua Tan, Chengda Huang, Enping Lin, Yuqing Huang and Zhong Chen
Int. J. Mol. Sci. 2024, 25(9), 4698; https://doi.org/10.3390/ijms25094698 - 25 Apr 2024
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Abstract
Proton magnetic resonance spectroscopy (1H MRS) presents a powerful tool for revealing molecular-level metabolite information, complementary to the anatomical insight delivered by magnetic resonance imaging (MRI), thus playing a significant role in in vivo/in vitro biological studies. However, its further applications [...] Read more.
Proton magnetic resonance spectroscopy (1H MRS) presents a powerful tool for revealing molecular-level metabolite information, complementary to the anatomical insight delivered by magnetic resonance imaging (MRI), thus playing a significant role in in vivo/in vitro biological studies. However, its further applications are generally confined by spectral congestion caused by numerous biological metabolites contained within the limited proton frequency range. Herein, we propose a pure-shift-based 1H localized MRS method as a proof of concept for high-resolution studies of biological samples. Benefitting from the spectral simplification from multiplets to singlet peaks, this method addresses the challenge of spectral congestion encountered in conventional MRS experiments and facilitates metabolite analysis from crowded NMR resonances. The performance of the proposed pure-shift 1H MRS method is demonstrated on different kinds of samples, including brain metabolite phantom and in vitro biological samples of intact pig brain tissue and grape tissue, using a 7.0 T animal MRI scanner. This proposed MRS method is readily implemented in common commercial NMR/MRI instruments because of its generally adopted pulse-sequence modules. Therefore, this study takes a meaningful step for MRS studies toward potential applications in metabolite analysis and disease diagnosis. Full article
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14 pages, 1613 KiB  
Article
Establishing Monoclonal Gammopathy of Undetermined Significance as an Independent Pre-Disease State of Multiple Myeloma Using Raman Spectroscopy, Dynamical Network Biomarker Theory, and Energy Landscape Analysis
by Shota Yonezawa, Takayuki Haruki, Keiichi Koizumi, Akinori Taketani, Yusuke Oshima, Makito Oku, Akinori Wada, Tsutomu Sato, Naoki Masuda, Jun Tahara, Noritaka Fujisawa, Shota Koshiyama, Makoto Kadowaki, Isao Kitajima and Shigeru Saito
Int. J. Mol. Sci. 2024, 25(3), 1570; https://doi.org/10.3390/ijms25031570 - 26 Jan 2024
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Abstract
Multiple myeloma (MM) is a cancer of plasma cells. Normal (NL) cells are considered to pass through a precancerous state, such as monoclonal gammopathy of undetermined significance (MGUS), before transitioning to MM. In the present study, we acquired Raman spectra at three stages—834 [...] Read more.
Multiple myeloma (MM) is a cancer of plasma cells. Normal (NL) cells are considered to pass through a precancerous state, such as monoclonal gammopathy of undetermined significance (MGUS), before transitioning to MM. In the present study, we acquired Raman spectra at three stages—834 NL, 711 MGUS, and 970 MM spectra—and applied the dynamical network biomarker (DNB) theory to these spectra. The DNB analysis identified MGUS as the unstable pre-disease state of MM and extracted Raman shifts at 1149 and 1527–1530 cm1 as DNB variables. The distribution of DNB scores for each patient showed a significant difference between the mean values for MGUS and MM patients. Furthermore, an energy landscape (EL) analysis showed that the NL and MM stages were likely to become stable states. Raman spectroscopy, the DNB theory, and, complementarily, the EL analysis will be applicable to the identification of the pre-disease state in clinical samples. Full article
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Review

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19 pages, 2993 KiB  
Review
Pushing the Resolution Limit of Stimulated Emission Depletion Optical Nanoscopy
by Sejoo Jeong, Dongbin Koh, Eunha Gwak, Chinmaya V. Srambickal, Daeha Seo, Jerker Widengren and Jong-Chan Lee
Int. J. Mol. Sci. 2024, 25(1), 26; https://doi.org/10.3390/ijms25010026 - 19 Dec 2023
Viewed by 1021
Abstract
Optical nanoscopy, also known as super-resolution optical microscopy, has provided scientists with the means to surpass the diffraction limit of light microscopy and attain new insights into nanoscopic structures and processes that were previously inaccessible. In recent decades, numerous studies have endeavored to [...] Read more.
Optical nanoscopy, also known as super-resolution optical microscopy, has provided scientists with the means to surpass the diffraction limit of light microscopy and attain new insights into nanoscopic structures and processes that were previously inaccessible. In recent decades, numerous studies have endeavored to enhance super-resolution microscopy in terms of its spatial (lateral) resolution, axial resolution, and temporal resolution. In this review, we discuss recent efforts to push the resolution limit of stimulated emission depletion (STED) optical nanoscopy across multiple dimensions, including lateral resolution, axial resolution, temporal resolution, and labeling precision. We introduce promising techniques and methodologies building on the STED concept that have emerged in the field, such as MINSTED, isotropic STED, and event-triggered STED, and evaluate their respective strengths and limitations. Moreover, we discuss trade-off relationships that exist in far-field optical microscopy and how they come about in STED optical nanoscopy. By examining the latest developments addressing these aspects, we aim to provide an updated overview of the current state of STED nanoscopy and its potential for future research. Full article
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