| Investigating the effects of dimethylsulfoxide on hemodynamics during cortical spreading depression by combining laser speckle imaging with optical intrinsic signal imaging. | |
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MedLine Citation:
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PMID: 20976804 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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BACKGROUND AND OBJECTIVES: Cortical spreading depression (CSD) is an important pathological model to study cerebral ischemia and migraine. In pharmacological studies of CSD, dimethylsulfoxide (DMSO) is an efficient solvent for water-insoluble drugs. Previous studies indicated that DMSO could prevent pial arteriolar dilation induced by oxidants. Therefore, it was very important to study the effect of DMSO on hemodynamics during CSD so that optimization of dose of DMSO as solvent can be made. STUDY DESIGN/MATERIALS AND METHODS: DMSO was topically applied on the exposed rat cortex. Single CSD was elicited by controlled injection of KCl. Pial arteriolar diameter, cerebral blood flow, and direct current potential during CSD were monitored by optical intrinsic signal imaging, laser speckle imaging, and electrophysiology method, respectively. RESULTS: Topical application of DMSO (0.1%, 0.4%, 2%, and 4%, v/v) increased arteriolar resting diameter and resting blood velocity at all vascular compartments. In addition, both vasodilation and hyperemic response to CSD were attenuated by DMSO in a dose-dependent manner at doses from 0.1% to 4%. In contrast, the maximum value of blood velocity during CSD was not significantly affected by DMSO. CONCLUSION: The attenuation in hemodynamic response during CSD could possibly be caused by increased baseline value of vessel tone and blood velocity. Our findings suggest that when investigators use DMSO to dissolve water-insoluble, topically applied drugs in the hemodynamic study of CSD, dose of DMSO should be kept below 0.1% in order to avoid false results. |
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Authors:
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Xiaoli Sun; Pengcheng Li; Weihua Luo; Shangbing Chen; Nengyun Feng; Jia Wang; Qingming Luo |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Lasers in surgery and medicine Volume: 42 ISSN: 1096-9101 ISO Abbreviation: Lasers Surg Med Publication Date: 2010 Nov |
Date Detail:
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Created Date: 2010-10-26 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8007168 Medline TA: Lasers Surg Med Country: United States |
Other Details:
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Languages: eng Pagination: 649-55 Citation Subset: IM |
Copyright Information:
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© 2010 Wiley-Liss, Inc. |
Affiliation:
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Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, PR China. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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