Abstract
Life expectancy has increased in most developed countries, which has led to an increase in the proportion of elderly people in the world’s population. However, this increase in life expectancy is not accompanied by a lengthening of the health span since aging is characterized with progressive deterioration in cellular and organ functions. The brain is particularly vulnerable to disease, and this is reflected in the onset of age-related neurodegenerative diseases such as Alzheimer’s disease. Research shows that dysfunction of two barriers in the central nervous system (CNS), the blood–brain barrier (BBB) and the blood–cerebrospinal fluid (CSF) barrier (BCSFB), plays an important role in the progression of these neurodegenerative diseases. The BBB is formed by the endothelial cells of the blood capillaries, whereas the BCSFB is formed by the epithelial cells of the choroid plexus (CP), both of which are affected during aging. Here, we give an overview of how these barriers undergo changes during aging and in Alzheimer’s disease, thereby disturbing brain homeostasis. Studying these changes is needed in order to gain a better understanding of the mechanisms of aging at the brain barriers, which might lead to the development of new therapies to lengthen the health span (including mental health) and reduce the chances of developing Alzheimer’s disease.
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Glossary
- Alzheimer’s disease
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Most common form of dementia, characterized by the aggregation of Aβ in extracellular senile plaques and the formation of intraneuronal neurofibrillary tangles composed of hyperphosphorylated tau protein
- Biondi rings
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Biondi rings are intracellular neurofibrillar inclusions found in the choroid plexus during aging
- Blood–brain barrier (BBB)
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One of the brain barriers, formed by tightly connected tight junctions between the endothelial cells in the brain. This barrier is supported by associated pericytes and astrocyte end-feet
- Blood–cerebrospinal fluid barrier (BCSFB)
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One of the brain barriers, formed by the choroid plexus epithelium. Tight junctions prevent contact between blood and cerebrospinal fluid (CSF)
- Dementia
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Progressive loss of cognitive functions, caused by severe neuronal death
- Inflammaging
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An important process during aging. It is a progressive low inflammatory state causing age-related diseases and death
- Lipofuscin
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Lipofuscins are granules filled with pigment composed of lipid-containing residues of lysosomal degradation. They can be found during aging in the liver, kidneys, neurons, and choroid plexus
- Pericyte
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Cells associated with the endothelial cells of capillaries and venules. They regulate blood flow and are important for the integrity of the blood–brain barrier
- Secretome
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Refers to all molecules secreted by cells, tissues, and organs
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Gorlé, N., Van Cauwenberghe, C., Libert, C. et al. The effect of aging on brain barriers and the consequences for Alzheimer’s disease development. Mamm Genome 27, 407–420 (2016). https://doi.org/10.1007/s00335-016-9637-8
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DOI: https://doi.org/10.1007/s00335-016-9637-8