Catherine Yeates, Ankita Sarkar, Prajakta Deshpande
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Alzheimer’s disease (AD) is a debilitating neurodegenerative disorder that currently has no cure and few effective treatments. One process that underlies the pathology of AD is the accumulation of amyloid beta 42 (Aβ42) plaques, which leads to aberrant activation of cell signaling pathways and neurodegeneration. Many transgenic models use the expression of human Aβ42 throughout the entire central nervous system or developing eye. Here we use a Drosophila eye model of AD to investigate interactions between wild-type and Aβ42-expressing neurons. We have developed a two-clone system using the FLP/FRT and Gal80/Gal4/UAS approaches to generate animals with GFP-negative wild-type (WT) clones of cells adjacent to GFP-positive Aβ42-expressing clones. Surprisingly, we found that WT clones, which do not express Aβ42, are eliminated by cell death, leading to a significant decrease in clone size compared to Aβ42-expressing clones. Furthermore, the evolutionarily conserved c-Jun N-terminal kinase (JNK) signaling pathway is induced in Aβ42-expressing cells. However, it is the WT sister clones that are preferentially affected by the increase in JNK activity from Aβ42-expressing cells. Downregulating JNK signaling in the Aβ42-expressing cells restores the size of the wild-type clones. This suggests that complex crosstalk between Aβ42-expressing cells and adjacent WT cells leads to JNK-mediated neurodegeneration of WT tissue.
Madhuri Kango-Singh, Amit Singh
Primary Advisor's Department
Stander Symposium project, College of Arts and Sciences
United Nations Sustainable Development Goals
Good Health and Well-Being
"Activation of JNK Signaling in Aβ42-expressing Neurons Triggers Cell Death in Wild-Type Neurons in a Drosophila Eye Model of Alzheimer’s Disease" (2020). Stander Symposium Projects. 1979.