Neuropathological Hallmarks During The Chronic Phase Of Ischemic Stroke In Mice And Humans
Many individuals who survive a stroke experience persistent neurological and cognitive difficulties long after the initial event. Recent research sheds light on why these challenges endure, revealing that a stroke triggers a cascade of changes in the brain that resemble an accelerated aging process. The study found that, in both mice and human brain samples, stroke leads to enduring neurodegenerative-like changes, meaning there’s ongoing damage to brain cells and their connections. This includes the breakdown of white matter, which is crucial for communication between different brain regions. Additionally, there’s a significant increase in “senescent” cells, which are cells that have stopped dividing but remain metabolically active and can release harmful substances, contributing to inflammation. The brain’s immune cells, called microglia, also become dysregulated and contribute to a state of chronic inflammation. These persistent changes, collectively termed “inflamm-aging,” contribute to the long-term cognitive and motor impairments observed in stroke survivors. Understanding these chronic processes opens new avenues for developing therapies that could target cellular aging and inflammation to improve long-term recovery and quality of life after a stroke.
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