{"id":39410,"date":"2023-04-12T00:00:04","date_gmt":"2023-04-12T07:00:04","guid":{"rendered":"https:\/\/vermont.salk.edu\/?post_type=disclosure&p=39410"},"modified":"2024-01-30T14:15:53","modified_gmt":"2024-01-30T22:15:53","slug":"mitochondria-power-supply-failure-may-cause-age-related-cognitive-impairment","status":"publish","type":"disclosure","link":"https:\/\/www.salk.edu\/es\/news-release\/mitochondria-power-supply-failure-may-cause-age-related-cognitive-impairment\/","title":{"rendered":"La falla en el suministro de energ\u00eda de las mitocondrias puede causar deterioro cognitivo relacionado con la edad."},"content":{"rendered":"

LA JOLLA\u2014Brains are like puzzles, requiring many nested and codependent pieces to function well. The brain is divided into areas, each containing many millions of neurons connected across thousands of synapses. These synapses, which enable communication between neurons, depend on even smaller structures: message-sending boutons (swollen bulbs at the branch-like tips of neurons), message-receiving dendrites (complementary branch-like structures for receiving bouton messages), and power-generating mitochondria. To create a cohesive brain, all these pieces must be accounted for.<\/p>\n

\"Electron
Electron microscopic image of neurons in the brain showing the presynaptic boutons (yellow), mitochondria (purple), and synapses (blue).
Haga clic aqu\u00ed<\/a> para obtener una imagen en alta resoluci\u00f3n.
Cr\u00e9dito: Instituto Salk<\/figcaption><\/figure>\n

However, in the aging brain, these pieces can get lost or altered and no longer fit in the greater brain puzzle.<\/p>\n

\u201cFifty percent of people experience loss of working memory with old age, meaning their ability to hold and manipulate information in the short-term decreases,\u201d says co-first author Courtney Glavis-Bloom, a senior staff scientist in Salk Institute Professor John Reynolds\u2019<\/a> lab. \u201cWe set out to understand why some individuals maintain healthy working memory as they age, while others do not. In the process, we discovered a novel mechanism for the synaptic basis of cognitive impairment.\u201d<\/p>\n

Prior studies had found that brains lose synapses as they age, and the researchers saw this pattern in their animal model, too. But when they looked at the synapses that remained, they found evidence of a breakdown in coordination between the size of boutons and the mitochondria they contained. A fundamental neuroscientific principle, the ultrastructural size principle, explains that whenever one part of the synaptic complex changes in size, so too must all <\/em>the other parts. The synapse, the mitochondria, the boutons\u2014all these parts must scale in accordance with one another. Before the Salk team\u2019s study, published in Frontiers in Aging Neuroscience<\/em><\/a> on April 12, 2023, nobody had asked whether this principle could be violated with age or disease.<\/p>\n

\"Normally,
Normally, the different parts of the synaptic complex grow and shrink together. The researchers found evidence that this process can go awry in aging, which may contribute to cognitive impairment.
Haga clic aqu\u00ed<\/a> para obtener una imagen en alta resoluci\u00f3n.
Cr\u00e9dito: Instituto Salk<\/figcaption><\/figure>\n

“To examine this, we turned to electron microscopy,\u201d says co-first author Casey Vanderlip, a former research assistant in Reynolds\u2019 lab. \u201cThis enabled us to visualize these components across many synapses. We found that synaptic loss occurred with healthy and impaired aging, but what differed was the breakdown in the correlation between the sizes of boutons and their mitochondria.\u201d<\/p>\n

\u201cIt is a ripple effect, with unfathomably small synaptic structures altering networks of neurons, brain function, and behavior,\u201d says Glavis-Bloom. \u201cInvestigating these microscopic dysfunctions is uncharted territory that could revolutionize our understanding of aging and its impact on cognition.\u201d<\/p>\n

The team found that adherence to the ultrastructural size principle was essential for avoiding working memory impairment with age. By viewing violation of the ultrastructural size principle and mitochondria-related failures as the key to age-related cognitive impairment, the study ushers in a new era for aging research.<\/p>\n

\"
From left: John Reynolds, Courtney Glavis-Bloom, and Casey Vanderlip.
Haga clic aqu\u00ed<\/a> para obtener una imagen en alta resoluci\u00f3n.
Cr\u00e9dito: Instituto Salk<\/figcaption><\/figure>\n

\u201cThe images we have captured of synapses are snapshots of a dynamic process,\u201d says Reynolds, holder of the Fiona and Sanjay Jha Chair in Neuroscience. \u201cWith these snapshots in hand, we can begin to think first about the mechanisms that coordinate the expansion and contraction of the various parts of the synaptic complex, then ask how disruption of these mechanisms can explain age-related cognitive decline. This opens an entirely new way of thinking about cognitive decline that could lead to new targets for future therapeutics.\u201d<\/p>\n

Other authors include Sammy Weiser Novak and Uri Manor of the Salk Institute; and Masaaki Kuwajima, Lyndsey Kirk, and Kristen M. Harris of the University of Texas at Austin.<\/p>\n

The work was supported by an Allen Initiative in Brain Health and Cognitive Impairment award made jointly through the American Heart Association and the Paul G. Allen Frontiers Group (19PABH134610000AHA), the National Institutes of Health (1R21AG068967-01, P30014195), the National Science Foundation (2014862), the Kavli Institute for Brain and Mind at UC San Diego (Innovative Research Grant 2021), the Waitt Foundation, the Larry L. Hillblom Foundation, the Don and Lorraine Freeberg Foundation, and the Conrad Prebys Foundation.<\/p>","protected":false},"featured_media":39627,"template":"","faculty":[107],"disease-research":[127,146,124],"class_list":["post-39410","disclosure","type-disclosure","status-publish","has-post-thumbnail","hentry","faculty-john-reynolds","disease-research-alzheimers-disease","disease-research-aging-and-regenerative-medicine","disease-research-neuroscience-and-neurological-disorders"],"acf":[],"yoast_head":"\nMitochondria power-supply failure may cause age-related cognitive impairment - Salk Institute for Biological Studies<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.salk.edu\/es\/news-release\/mitochondria-power-supply-failure-may-cause-age-related-cognitive-impairment\/\" \/>\n<meta property=\"og:locale\" content=\"es_MX\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mitochondria power-supply failure may cause age-related cognitive impairment - Salk Institute for Biological Studies\" \/>\n<meta property=\"og:description\" content=\"LA JOLLA\u2014Brains are like puzzles, requiring many nested and codependent pieces to function well. 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