Revealing the MRI-Contrast in Optically Cleared Brains.

Autor: Oz S; Department of Neuroscience, Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, 3525433, Israel., Saar G; Biomedical Core Facility, Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, 3525433, Israel., Olszakier S; Department of Neuroscience, Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, 3525433, Israel., Heinrich R; Department of Neuroscience, Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, 3525433, Israel., Kompanets MO; L.M. Litvinenko Institute of Physico-Organic Chemistry and Coal Chemistry, National Academy of Sciences of Ukraine, Kyiv, Ukraine., Berlin S; Department of Neuroscience, Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, 3525433, Israel.
Jazyk: angličtina
Zdroj: Advanced science (Weinheim, Baden-Wurttemberg, Germany) [Adv Sci (Weinh)] 2024 Jun; Vol. 11 (22), pp. e2400316. Date of Electronic Publication: 2024 Apr 22.
DOI: 10.1002/advs.202400316
Abstrakt: The current consensus holds that optically-cleared specimens are unsuitable for Magnetic Resonance Imaging (MRI); exhibiting absence of contrast. Prior studies combined MRI with tissue-clearing techniques relying on the latter's ability to eliminate lipids, thereby fostering the assumption that lipids constitute the primary source of ex vivo MRI-contrast. Nevertheless, these findings contradict an extensive body of literature that underscores the contribution of other features to contrast. Furthermore, it remains unknown whether non-delipidating clearing methods can produce MRI-compatible specimens or whether MRI-contrast can be re-established. These limitations hinder the development of multimodal MRI-light-microscopy (LM) imaging approaches. This study assesses the relation between MRI-contrast, and delipidation in optically-cleared whole brains following different tissue-clearing approaches. It is demonstrated that uDISCO and ECi-brains are MRI-compatible upon tissue rehydration, despite both methods' substantial delipidating-nature. It is also demonstrated that, whereas Scale-clearing preserves most lipids, Scale-cleared brain lack MRI-contrast. Furthermore, MRI-contrast is restored to lipid-free CLARITY-brains without introducing lipids. Our results thereby dissociate between the essentiality of lipids to MRI-contrast. A tight association is found between tissue expansion, hyperhydration and loss of MRI-contrast. These findings then enabled us to develop a multimodal MRI-LM-imaging approach, opening new avenues to bridge between the micro- and mesoscale for biomedical research and clinical applications.
(© 2024 The Authors. Advanced Science published by Wiley‐VCH GmbH.)
Databáze: MEDLINE
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