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Zhang C, Jamshidi M, Delafontaine-Martel P, Linninger AA, Lesage F. Evaluation of cerebral microcirculation in a mouse model of systemic inflammation. NEUROPHOTONICS 2024; 11:035003. [PMID: 39011517 PMCID: PMC11249390 DOI: 10.1117/1.nph.11.3.035003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Revised: 05/23/2024] [Accepted: 05/28/2024] [Indexed: 07/17/2024]
Abstract
Significance Perturbations in the microcirculatory system have been observed in neurological conditions, such as Alzheimer's disease or systemic inflammation. However, changes occurring at the level of the capillary are difficult to translate to biomarkers that could be measured macroscopically. Aim We aim to evaluate whether transit time changes reflect capillary stalling and to what degree. Approach We employ a combined spectral optical coherence tomography (OCT) and fluorescence optical imaging (FOI) system to investigate the relation between capillary stalling and transit time in a mouse model of systemic inflammation induced by intraperitoneal injection of lipopolysaccharide. Angiograms are obtained using OCT, and fluorescence signal images are acquired by the FOI system upon intravenous injection of fluorescein isothiocyanate via a catheter inserted into the tail vein. Results Our findings reveal that lipopolysaccharide (LPS) administration significantly increases both the percentage and duration of capillary stalling compared to mice receiving a 0.9% saline injection. Moreover, LPS-induced mice exhibit significantly prolonged arteriovenous transit time compared to control mice. Conclusions These observations suggest that capillary stalling, induced by inflammation, modulates cerebral mean transit time, a measure that has translational potential.
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Affiliation(s)
- Cong Zhang
- Polytechnique Montreal, Department of Electrical Engineering, Montreal, Quebec, Canada
- Montreal Heart Institute, Research center, Montreal, Quebec, Canada
| | - Mohammad Jamshidi
- University of Illinois at Chicago, Department of Biomedical Engineering, Chicago, Illinois, United States
| | - Patrick Delafontaine-Martel
- Polytechnique Montreal, Department of Electrical Engineering, Montreal, Quebec, Canada
- Montreal Heart Institute, Research center, Montreal, Quebec, Canada
| | - Andreas A Linninger
- University of Illinois at Chicago, Department of Biomedical Engineering, Chicago, Illinois, United States
- University of Illinois at Chicago, Department of Neurosurgery, Chicago, Illinois, United States
| | - Frédéric Lesage
- Polytechnique Montreal, Department of Electrical Engineering, Montreal, Quebec, Canada
- Montreal Heart Institute, Research center, Montreal, Quebec, Canada
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Davidson CG, Woodford SJ, Mathur S, Valle DB, Foster D, Kioutchoukova I, Mahmood A, Lucke-Wold B. Investigation into the vascular contributors to dementia and the associated treatments. EXPLORATION OF NEUROSCIENCE 2023; 2:224-237. [PMID: 37981945 PMCID: PMC10655228 DOI: 10.37349/en.2023.00023] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Accepted: 09/20/2023] [Indexed: 11/21/2023]
Abstract
As the average lifespan has increased, memory disorders have become a more pressing public health concern. However, dementia in the elderly population is often neglected in light of other health priorities. Therefore, expanding the knowledge surrounding the pathology of dementia will allow more informed decision-making regarding treatment within elderly and older adult populations. An important emerging avenue in dementia research is understanding the vascular contributors to dementia. This review summarizes potential causes of vascular cognitive impairment like stroke, microinfarction, hypertension, atherosclerosis, blood-brain-barrier dysfunction, and cerebral amyloid angiopathy. Also, this review address treatments that target these vascular impairments that also show promising results in reducing patient's risk for and experience of dementia.
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Affiliation(s)
| | | | - Shreya Mathur
- College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | | | - Devon Foster
- University of Central Florida, Orlando, FL 32816, USA
| | | | - Arman Mahmood
- College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Brandon Lucke-Wold
- Department of Neurosurgery, University of Florida, Gainesville, FL 32610, USA
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Hartmann DA, Coelho-Santos V, Shih AY. Pericyte Control of Blood Flow Across Microvascular Zones in the Central Nervous System. Annu Rev Physiol 2022; 84:331-354. [PMID: 34672718 PMCID: PMC10480047 DOI: 10.1146/annurev-physiol-061121-040127] [Citation(s) in RCA: 83] [Impact Index Per Article: 41.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The vast majority of the brain's vascular length is composed of capillaries, where our understanding of blood flow control remains incomplete. This review synthesizes current knowledge on the control of blood flow across microvascular zones by addressing issues with nomenclature and drawing on new developments from in vivo optical imaging and single-cell transcriptomics. Recent studies have highlighted important distinctions in mural cell morphology, gene expression, and contractile dynamics, which can explain observed differences in response to vasoactive mediators between arteriole, transitional, and capillary zones. Smooth muscle cells of arterioles and ensheathing pericytes of the arteriole-capillary transitional zone control large-scale, rapid changes in blood flow. In contrast, capillary pericytes downstream of the transitional zone act on slower and smaller scales and are involved in establishing resting capillary tone and flow heterogeneity. Many unresolved issues remain, including the vasoactive mediators that activate the different pericyte types in vivo, the role of pericyte-endothelial communication in conducting signals from capillaries to arterioles, and how neurological disease affects these mechanisms.
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Affiliation(s)
- David A Hartmann
- Department of Neurology and Neurological Sciences, Stanford University, Stanford, California, USA
| | - Vanessa Coelho-Santos
- Center for Developmental Biology and Regenerative Medicine, Seattle Children's Research Institute, Seattle, Washington, USA;
- Department of Pediatrics, University of Washington, Seattle, Washington, USA
| | - Andy Y Shih
- Center for Developmental Biology and Regenerative Medicine, Seattle Children's Research Institute, Seattle, Washington, USA;
- Department of Pediatrics, University of Washington, Seattle, Washington, USA
- Department of Bioengineering, University of Washington, Seattle, Washington, USA
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Moeini M, Cloutier-Tremblay C, Lu X, Kakkar A, Lesage F. Cerebral tissue pO 2 response to treadmill exercise in awake mice. Sci Rep 2020; 10:13358. [PMID: 32770089 PMCID: PMC7414913 DOI: 10.1038/s41598-020-70413-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2020] [Accepted: 07/29/2020] [Indexed: 12/16/2022] Open
Abstract
We exploited two-photon microscopy and Doppler optical coherence tomography to examine the cerebral blood flow and tissue pO2 response to forced treadmill exercise in awake mice. To our knowledge, this is the first study performing both direct measure of brain tissue pO2 during acute forced exercise and underlying microvascular response at capillary and non-capillary levels. We observed that cerebral perfusion and oxygenation are enhanced during running at 5 m/min compared to rest. At faster running speeds (10 and 15 m/min), decreasing trends in arteriolar and capillary flow speed were observed, which could be due to cerebral autoregulation and constriction of arterioles in response to blood pressure increase. However, tissue pO2 was maintained, likely due to an increase in RBC linear density. Higher cerebral oxygenation at exercise levels 5–15 m/min suggests beneficial effects of exercise in situations where oxygen delivery to the brain is compromised, such as in aging, atherosclerosis and Alzheimer Disease.
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Affiliation(s)
- Mohammad Moeini
- Department of Biomedical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.,Research Center of Montreal Heart Institute, Montréal, QC, Canada
| | - Christophe Cloutier-Tremblay
- Biomedical Engineering Institute, École Polytechnique de Montréal, Succursale Centre-ville, P.O. Box 6079, Montréal, QC, H3C 3A7, Canada
| | - Xuecong Lu
- Research Center of Montreal Heart Institute, Montréal, QC, Canada.,Biomedical Engineering Institute, École Polytechnique de Montréal, Succursale Centre-ville, P.O. Box 6079, Montréal, QC, H3C 3A7, Canada
| | - Ashok Kakkar
- Department of Chemistry, McGill University, Montréal, QC, Canada
| | - Frédéric Lesage
- Research Center of Montreal Heart Institute, Montréal, QC, Canada. .,Biomedical Engineering Institute, École Polytechnique de Montréal, Succursale Centre-ville, P.O. Box 6079, Montréal, QC, H3C 3A7, Canada.
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