Camblor-Perujo, Santiago ORCID: 0000-0003-3345-428X (2024). The endocytic adaptor AP-2 interacts with γ-TuRC components o maintain centrosome integrity in neural progenitor cells. PhD thesis, Universität zu Köln.
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Abstract
Neurogenesis is the process by which a population of cells called Neural Progenitor Cells (NPCs) produces neurons and glia within the CNS. This is a crucial process for development, and it has been shown that in the adult brain continues in restricted areas to support functions like learning, memory formation, or injury recovery. NPCs can divide differently to maintain the pool of progenitor cells and produce newly differentiated cells. These different division modes are tightly modulated by the cell cycle, and disturbances in it can result in severe disorders in development and aging. Centrosomes are cellular structures essential for cell cycle progression, and the correct structure of this organelle in cycling cells is pivotal for the generation of neurons, and disruption of it leads to neurodevelopmental and neurodegenerative disorders. Interestingly, several studies have highlighted alternative roles of endocytic machinery proteins in the cell cycle, also called moonlighting. This thesis reports a novel role of Adaptor Protein Complex-2 (AP-2) in centrosome structure and cell cycle progression. AP-2 was found to interact with components of the gamma-tubulin ring complexes (γ-TuRC), a set of proteins crucial for centrosome formation and microtubule (MTs) nucleation. NPCs deficient for AP-2 reveal defects in centrosome formation and p53-dependent G1/S phase cell cycle arrest and senescence-related cell death. This function of AP-2 in regulating NPC proliferative capacity is independent of clathrin and requires its association with components of γ-TURC. AP-2-dependent γ-TuRC assembly at the centrosome prevents premature NPC differentiation. Taken together, our data identify a novel non-canonical function of the endocytic adaptor AP-2 in regulating the proliferative capacity of NPC and set directions for identifying novel therapeutic strategies for the treatment of neurodevelopmental and neurodegenerative disorders with AP-2 complex dysfunction.
Item Type: | Thesis (PhD thesis) | ||||||||||
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URN: | urn:nbn:de:hbz:38-722069 | ||||||||||
Date: | 2024 | ||||||||||
Language: | English | ||||||||||
Faculty: | Faculty of Mathematics and Natural Sciences | ||||||||||
Divisions: | CECAD - Cluster of Excellence Cellular Stress Responses in Aging-Associated Diseases | ||||||||||
Subjects: | Life sciences | ||||||||||
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Date of oral exam: | 27 February 2023 | ||||||||||
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Refereed: | Yes | ||||||||||
URI: | http://kups.ub.uni-koeln.de/id/eprint/72206 |
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