Browsing by Subject "Cell biology"
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Item Open Access Liquid-culture protocols for synchronous starvation, growth, dauer formation, and dietary restriction of Caenorhabditis elegans.(STAR protocols, 2021-03) Hibshman, Jonathan D; Webster, Amy K; Baugh, L RyanStandard laboratory culture of Caenorhabditis elegans utilizes solid growth media with a bacterial food source. However, this culture method limits control of food availability and worm population density, factors that impact many life-history traits. Here, we describe liquid-culture protocols for precisely modulating bacterial food availability and population density, facilitating reliable production of arrested L1 larvae, dauer larvae, dietarily restricted worms, or well-fed worms. Worms can be grown in small quantities for standard assays or in the millions for other applications. For complete details on the use and execution of these protocols, please refer to Hibshman et al. (2016), Webster et al. (2018), and Jordan et al. (2019).Item Open Access Multi-apical polarity of alveolar stem cells and their dynamics during lung development and regeneration.(iScience, 2022-10) Konkimalla, Arvind; Konishi, Satoshi; Kobayashi, Yoshihiko; Kadur Lakshminarasimha Murthy, Preetish; Macadlo, Lauren; Mukherjee, Ananya; Elmore, Zachary; Kim, So-Jin; Pendergast, Ann Marie; Lee, Patty J; Asokan, Aravind; Knudsen, Lars; Bravo-Cordero, Jose Javier; Tata, Aleksandra; Tata, Purushothama RaoEpithelial cells of diverse tissues are characterized by the presence of a single apical domain. In the lung, electron microscopy studies have suggested that alveolar type-2 epithelial cells (AT2s) en face multiple alveolar sacs. However, apical and basolateral organization of the AT2s and their establishment during development and remodeling after injury repair remain unknown. Thick tissue imaging and electron microscopy revealed that a single AT2 can have multiple apical domains that enface multiple alveoli. AT2s gradually establish multi-apical domains post-natally, and they are maintained throughout life. Lineage tracing, live imaging, and selective cell ablation revealed that AT2s dynamically reorganize multi-apical domains during injury repair. Single-cell transcriptome signatures of residual AT2s revealed changes in cytoskeleton and cell migration. Significantly, cigarette smoke and oncogene activation lead to dysregulation of multi-apical domains. We propose that the multi-apical domains of AT2s enable them to be poised to support the regeneration of a large array of alveolar sacs.