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Article: Non-invasive MRI Assessments of Tissue Microstructures and Macromolecules in the Eye upon Biomechanical or Biochemical Modulation

TitleNon-invasive MRI Assessments of Tissue Microstructures and Macromolecules in the Eye upon Biomechanical or Biochemical Modulation
Authors
Issue Date2016
PublisherNature Publishing Group: Open Access Journals - Option C. The Journal's web site is located at http://www.nature.com/srep/index.html
Citation
Scientific Reports, 2016, v. 6, article no. 32080 How to Cite?
AbstractThe microstructural organization and composition of the corneoscleral shell (CSS) determine the biomechanical behavior of the eye, and are important in diseases such as glaucoma and myopia. However, limited techniques can assess these properties globally, non-invasively and quantitatively. In this study, we hypothesized that multi-modal magnetic resonance imaging (MRI) can reveal the effects of biomechanical or biochemical modulation on CSS. Upon intraocular pressure (IOP) elevation, CSS appeared hyperintense in both freshly prepared ovine eyes and living rat eyes using T2-weighted MRI. Quantitatively, transverse relaxation time (T2) of CSS increased non-linearly with IOP at 0–40 mmHg and remained longer than unloaded tissues after being unpressurized. IOP loading also increased fractional anisotropy of CSS in diffusion tensor MRI without apparent change in magnetization transfer MRI, suggestive of straightening of microstructural fibers without modification of macromolecular contents. Lastly, treatments with increasing glyceraldehyde (mimicking crosslinking conditions) and chondroitinase-ABC concentrations (mimicking glycosaminoglycan depletion) decreased diffusivities and increased magnetization transfer in cornea, whereas glyceraldehyde also increased magnetization transfer in sclera. In summary, we demonstrated the changing profiles of MRI contrast mechanisms resulting from biomechanical or biochemical modulation of the eye non-invasively. Multi-modal MRI may help evaluate the pathophysiological mechanisms in CSS and the efficacy of corneoscleral treatments.
Persistent Identifierhttp://hdl.handle.net/10722/247402
ISSN
2019 Impact Factor: 3.998
2015 SCImago Journal Rankings: 2.073
PubMed Central ID
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorHo, LC-
dc.contributor.authorSigal, IA-
dc.contributor.authorJan, NJ-
dc.contributor.authorYang, X-
dc.contributor.authorvan der Merwe, Y-
dc.contributor.authorYu, Y-
dc.contributor.authorChau, Y-
dc.contributor.authorLeung, CK-
dc.contributor.authorConner, IP-
dc.contributor.authorJin, T-
dc.contributor.authorWu, EX-
dc.contributor.authorKim, SG-
dc.contributor.authorWollstein, G-
dc.contributor.authorSchuman , JS-
dc.contributor.authorChan, KC-
dc.date.accessioned2017-10-18T08:26:40Z-
dc.date.available2017-10-18T08:26:40Z-
dc.date.issued2016-
dc.identifier.citationScientific Reports, 2016, v. 6, article no. 32080-
dc.identifier.issn2045-2322-
dc.identifier.urihttp://hdl.handle.net/10722/247402-
dc.description.abstractThe microstructural organization and composition of the corneoscleral shell (CSS) determine the biomechanical behavior of the eye, and are important in diseases such as glaucoma and myopia. However, limited techniques can assess these properties globally, non-invasively and quantitatively. In this study, we hypothesized that multi-modal magnetic resonance imaging (MRI) can reveal the effects of biomechanical or biochemical modulation on CSS. Upon intraocular pressure (IOP) elevation, CSS appeared hyperintense in both freshly prepared ovine eyes and living rat eyes using T2-weighted MRI. Quantitatively, transverse relaxation time (T2) of CSS increased non-linearly with IOP at 0–40 mmHg and remained longer than unloaded tissues after being unpressurized. IOP loading also increased fractional anisotropy of CSS in diffusion tensor MRI without apparent change in magnetization transfer MRI, suggestive of straightening of microstructural fibers without modification of macromolecular contents. Lastly, treatments with increasing glyceraldehyde (mimicking crosslinking conditions) and chondroitinase-ABC concentrations (mimicking glycosaminoglycan depletion) decreased diffusivities and increased magnetization transfer in cornea, whereas glyceraldehyde also increased magnetization transfer in sclera. In summary, we demonstrated the changing profiles of MRI contrast mechanisms resulting from biomechanical or biochemical modulation of the eye non-invasively. Multi-modal MRI may help evaluate the pathophysiological mechanisms in CSS and the efficacy of corneoscleral treatments.-
dc.languageeng-
dc.publisherNature Publishing Group: Open Access Journals - Option C. The Journal's web site is located at http://www.nature.com/srep/index.html-
dc.relation.ispartofScientific Reports-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.titleNon-invasive MRI Assessments of Tissue Microstructures and Macromolecules in the Eye upon Biomechanical or Biochemical Modulation-
dc.typeArticle-
dc.identifier.emailWu, EX: ewu@eee.hku.hk-
dc.identifier.authorityWu, EX=rp00193-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1038/srep32080-
dc.identifier.pmid27561353-
dc.identifier.pmcidPMC5000015-
dc.identifier.scopuseid_2-s2.0-84984614353-
dc.identifier.hkuros280327-
dc.identifier.volume6-
dc.identifier.spagearticle no. 32080-
dc.identifier.epagearticle no. 32080-
dc.identifier.isiWOS:000381977700001-
dc.publisher.placeUnited Kingdom-
dc.identifier.issnl2045-2322-

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