Abstract
Cerebral microhemorrhages (CMHs; microbleeds), which are small focal intracerebral hemorrhages, importantly contribute to the pathogenesis of cognitive decline and dementia in older adults. Although recently it has been increasingly recognized that the venous side of the cerebral circulation likely plays a fundamental role in the pathogenesis of a wide spectrum of cerebrovascular and brain disorders, its role in the pathogenesis of CMHs has never been studied. The present study was designed to experimentally test the hypothesis that venous congestion can exacerbate the genesis of CMHs. Increased cerebral venous pressure was induced by internal and external jugular vein ligation (JVL) in C57BL/6 mice in which systemic hypertension was induced by treatment with angiotensin II plus L-NAME. Histological analysis (diaminobenzidine staining) showed that mice with JVL developed multiple CMHs. CMHs in mice with JVL were often localized adjacent to veins and venules and their morphology was consistent with venous origin of the bleeds. In brains of mice with JVL, a higher total count of CMHs was observed compared to control mice. CMHs were distributed widely in the brain of mice with JVL, including the cortical gray matter, brain stem, the basal ganglia, subcortical white matter, cerebellum, and the hippocampi. In mice with JVL, there were more CMHs predominantly in cerebral cortex, brain stem, and cerebellum than in control mice. CMH burden, defined as total CMH volume, also significantly increased in mice with JVL. Thus, cerebral venous congestion can exacerbate CMHs. These observations have relevance to the pathogenesis of cognitive impairment associated with right heart failure as well as elevated cerebral venous pressure due to jugular venous reflux in older adults.
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This work was supported by grants from the American Heart Association (AHA834339), the Oklahoma Center for the Advancement of Science and Technology, the National Institute on Aging (R01-AG055395, R01-AG047879; R01-AG038747; K01-AG073614), the National Institute of Neurological Disorders and Stroke (NINDS; R01-NS100782, R01-NS056218), a Pilot Grant from the Stephenson Cancer Center funded by the National Cancer Institute Cancer Center Support Grant P30CA225520 awarded to the University of Oklahoma Stephenson Cancer Center, the Oklahoma Shared Clinical and Translational Resources (OSCTR) program funded by the National Institute of General Medical Sciences (U54GM104938), the Presbyterian Health Foundation, the European Union–funded grants EFOP-3.6.1–16-2016–00008, 20765–3/2018/FEKUTSTRAT, EFOP-3.6.2.-16–2017-00008, GINOP-2.3.2–15-2016–00048, and GINOP-2.3.3–15-2016–00032; the National Research, Development and Innovation Office (NKFI-FK123798; Nemzeti Szivlabor), the Hungarian Academy of Sciences (Bolyai Research Scholarship BO/00634/15), and the ÚNKP-18–4-PTE-6 New National Excellence Program of the Ministry of Human Capacities (to PT). The Thematic Excellence Programme of the Ministry for Innovation and Technology was also supported by the National Research, Development and Innovation Fund of Hungary (Nos. TKP2020-IKA-04 and TKP2020-NKA-04) within the frameworks of the preclinical thematic programme of the University of Debrecen. The authors acknowledge the support from the NIA-funded Geroscience Training Program in Oklahoma (T32AG052363). The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.
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Dr. Anna Csiszar serves as Associate Editor for The Journal of Gerontology, Series A: Biological Sciences and Medical Sciences and GeroScience. Dr. Stefano Tarantini serves as Guest Editor for Frontiers in Aging Neuroscience. Dr. Zoltan Ungvari serves as Editor-in-Chief for GeroScience and as Consulting Editor for The American Journal of Physiology-Heart and Circulatory Physiology.
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Nyul-Toth, A., Fulop, G.A., Tarantini, S. et al. Cerebral venous congestion exacerbates cerebral microhemorrhages in mice. GeroScience 44, 805–816 (2022). https://doi.org/10.1007/s11357-021-00504-0
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DOI: https://doi.org/10.1007/s11357-021-00504-0