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Delafontaine-Martel P, Zhang C, Lu X, Damseh R, Lesage F, Marchand PJ. Targeted capillary photothrombosis via multiphoton excitation of Rose Bengal. J Cereb Blood Flow Metab 2023; 43:1713-1725. [PMID: 36647768 PMCID: PMC10581236 DOI: 10.1177/0271678x231151560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Revised: 12/12/2022] [Accepted: 12/19/2022] [Indexed: 01/18/2023]
Abstract
Microvascular stalling, the process occurring when a capillary temporarily loses perfusion, has gained increasing interest in recent years through its demonstrated presence in various neuropathologies. Studying the impact of such stalls on the surrounding brain tissue is of paramount importance to understand their role in such diseases. Despite efforts trying to study the stalling events, investigations are hampered by their elusiveness and scarcity. In an attempt to alleviate these hurdles, we present here a novel methodology enabling transient occlusions of targeted microvascular segments through multiphoton excitation of Rose Bengal, an established photothrombotic agent. With n = 7 mice C57BL/6 J (5 males and 2 females) and 95 photothrombosis trials, we demonstrate the ability of triggering reversible blockages by illuminating a capillary segment during ∼300 s at 1000 nm, using a standard Ti:Sapphire femtosecond laser. Furthermore, we performed concurrent Optical Coherence Microscopy (OCM) angiography imaging of the microvascular network to highlight the specificity of the targeted occlusion and its duration. Through comparison with a control group, we conclude that blood flow cessation is indeed created by the photothrombotic agent via multiphoton excitation and is temporary, followed by a flow recovery in less than 24 h. Moreover, Immunohistology points toward a stalling mechanism driven by adherence of the neutrophil in the vascular lumen. This observation seems to be promoted by the inflammation locally created via multiphoton activation of Rose Bengal.
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Affiliation(s)
- Patrick Delafontaine-Martel
- Department of Electrical Engineering, Polytechnique Montreal, Montreal, Canada
- Research Center, Montreal Heart Institute, Montreal, Canada
| | - Cong Zhang
- Department of Electrical Engineering, Polytechnique Montreal, Montreal, Canada
- Research Center, Montreal Heart Institute, Montreal, Canada
| | - Xuecong Lu
- Research Center, Montreal Heart Institute, Montreal, Canada
- DeGroote School of Business – McMaster University, Ontario, Canada
| | - Rafat Damseh
- Research Center, Montreal Heart Institute, Montreal, Canada
- College of Information Technology, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Frédéric Lesage
- Department of Electrical Engineering, Polytechnique Montreal, Montreal, Canada
- Research Center, Montreal Heart Institute, Montreal, Canada
| | - Paul J Marchand
- Department of Electrical Engineering, Polytechnique Montreal, Montreal, Canada
- Research Center, Montreal Heart Institute, Montreal, Canada
- École polytechnique fédérale de Lausanne- EPFL, Lausanne, Switzerland
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