In JoVE (1)
Other Publications (1)
Articles by Skyler Hunter in JoVE
Caenorhabditis Sieve: A Low-tech Instrument and Methodology for Sorting Small Multicellular Organisms Skyler Hunter*1,2, Malabika Maulik*3, Courtney Scerbak4, Elena Vayndorf2, Barbara E. Taylor5 1Department of Biology and Wildlife, University of Alaska Fairbanks, 2Institute of Arctic Biology, University of Alaska Fairbanks, 3Department of Chemistry and Biochemistry, University of Alaska Fairbanks, 4Departments of Biology and Chemistry, Earlham College, 5Department of Biological Sciences, College of Natural Science and Mathematics, California State University Long Beach The current protocol includes a methodology for the sorting and cleaning of age-matched populations of Caenorhabditis elegans. It uses a simple, inexpensive, and efficient custom-made tool to obtain a large experimental population of nematodes for research.
Other articles by Skyler Hunter on PubMed
Morphological Remodeling of C. Elegans Neurons During Aging is Modified by Compromised Protein Homeostasis NPJ Aging and Mechanisms of Disease. 2016 | Pubmed ID: 27347427 Understanding cellular outcomes, such as neuronal remodeling, that are common to both healthy and diseased aging brains is essential to the development of successful brain aging strategies. Here, we used Caenorhabdits elegans to investigate how the expression of proteotoxic triggers, such as polyglutamine (polyQ)-expanded huntingtin and silencing of proteostasis regulators, such as the ubiquitin-proteasome system (UPS) and protein clearance components, may impact the morphological remodeling of individual neurons as animals age. We examined the effects of disrupted proteostasis on the integrity of neuronal cytoarchitecture by imaging a transgenic C. elegans strain in which touch receptor neurons express the first 57 amino acids of the human huntingtin (Htt) gene with expanded polyQs (128Q) and by using neuron-targeted RNA interference in adult wild-type neurons to knockdown genes encoding proteins involved in proteostasis. We found that proteostatic challenges conferred by polyQ-expanded Htt and knockdown of specific genes involved in protein homeostasis can lead to morphological changes that are restricted to specific domains of specific neurons. The age-associated branching of PLM neurons is suppressed by N-ter polyQ-expanded Htt expression, whereas ALM neurons with polyQ-expanded Htt accumulate extended outgrowths and other soma abnormalities. Furthermore, knockdown of genes important for ubiquitin-mediated degradation, lysosomal function, and autophagy modulated these age-related morphological changes in otherwise normal neurons. Our results show that the expression of misfolded proteins in neurodegenerative disease such as Huntington's disease modifies the morphological remodeling that is normally associated with neuronal aging. Our results also show that morphological remodeling of healthy neurons during aging can be regulated by the UPS and other proteostasis pathways. Collectively, our data highlight a model in which morphological remodeling during neuronal aging is strongly affected by disrupted proteostasis and expression of disease-associated, misfolded proteins such as human polyQ-Htt species.