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Updated: Mar 6, 2026
Sub-acute Cerebral Microhemorrhages Induced by Lipopolysaccharide Injection in Rats
Published on: October 17, 2018
Cerebral microhemorrhages: mechanisms, consequences, and prevention
Zoltan Ungvari1,2, Stefano Tarantini3,2, Angelia C Kirkpatrick4,5
1Reynolds Oklahoma Center on Aging, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; zoltan-ungvari@ouhsc.edu.
Abstract:
The increasing prevalence of multifocal cerebral microhemorrhages (CMHs, also known as "cerebral microbleeds") is a significant, newly recognized problem in the aging population of the Western world. CMHs are associated with rupture of small intracerebral vessels and are thought to progressively impair neuronal function, potentially contributing to cognitive decline, geriatric psychiatric syndromes, and gait disorders. Clinical studies show that aging and hypertension significantly increase prevalence of CMHs. CMHs are also now recognized by the National Institutes of Health as a major factor in Alzheimer's disease pathology. Moreover, the presence of CMHs is an independent risk factor for subsequent larger intracerebral hemorrhages. In this article, we review the epidemiology, detection, risk factors, clinical significance, and pathogenesis of CMHs. The potential age-related cellular mechanisms underlying the development of CMHs are discussed, with a focus on the structural determinants of microvascular fragility, age-related alterations in cerebrovascular adaptation to hypertension, the role of oxidative stress and matrix metalloproteinase activation, and the deleterious effects of arterial stiffening, increased pulse pressure, and impaired myogenic autoregulatory protection on the brain microvasculature. Finally, we examine potential treatments for the prevention of CMHs based on the proposed model of aging- and hypertension-dependent activation of the reactive oxygen species-matrix metalloproteinases axis, and we discuss critical questions to be addressed by future studies.
Insights
Cerebral microhemorrhages (CMHs) are increasingly common in older adults, linked to aging and hypertension. These microbleeds may impair brain function and increase stroke risk.
Area of Science:
- Neurology
- Gerontology
- Vascular Biology
Background:
- Cerebral microhemorrhages (CMHs) are increasingly prevalent in aging populations.
- CMHs result from small vessel rupture and are linked to cognitive decline, psychiatric issues, and gait disorders.
- Aging and hypertension are key risk factors for CMHs, which are also implicated in Alzheimer's disease pathology and predict larger strokes.
Purpose of the Study:
- To review the epidemiology, detection, risk factors, clinical significance, and pathogenesis of CMHs.
- To discuss age-related cellular mechanisms contributing to microvascular fragility and cerebrovascular dysfunction.
- To explore potential treatments targeting the reactive oxygen species-matrix metalloproteinases axis.
Main Methods:
- Literature review of epidemiological, clinical, and mechanistic studies on CMHs.
- Analysis of age-related cellular processes affecting brain microvasculature.
- Examination of therapeutic strategies based on proposed pathogenic pathways.
Main Results:
- CMHs are significantly associated with aging, hypertension, and Alzheimer's disease.
- Microvascular fragility, oxidative stress, and arterial stiffening are critical in CMH development.
- The reactive oxygen species-matrix metalloproteinases axis is a potential therapeutic target.
Conclusions:
- CMHs represent a growing concern in aging populations, impacting neurological function and increasing hemorrhage risk.
- Understanding the cellular mechanisms of CMHs is crucial for developing preventative strategies.
- Future research should focus on validating therapeutic interventions for CMH prevention.
