An Unbiased High-Throughput Screen to Identify Novel Effectors That Impact on Cardiomyocyte Aggregate Levels
| Autor: | Patrick M. McLendon, Jeffery D. Molkentin, Jeffrey Robbins, Na Xu, Sonia R. Singh, Gregory Davis, Nathan Salomonis, James Gulick |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Physiology Biology Article Desmin Small hairpin RNA 03 medical and health sciences Mice Crystallin Animals Myocytes Cardiac Cloning Molecular Gene Cells Cultured Cell Aggregation Genetics Janus kinase 1 Effector Autophagy RNA Janus Kinase 1 Crystallins Cell biology High-Throughput Screening Assays Rats 030104 developmental biology Cardiology and Cardiovascular Medicine Cardiomyopathies Transcriptome Tyrosine kinase |
| Zdroj: | Circulation research. 121(6) |
| ISSN: | 1524-4571 |
| Popis: | Rationale: Postmitotic cells, such as cardiomyocytes, seem to be particularly susceptible to proteotoxic stimuli, and large, proteinaceous deposits are characteristic of the desmin-related cardiomyopathies and crystallin cardiomyopathic diseases. Increased activity of protein clearance pathways in the cardiomyocyte, such as proteasomal degradation and autophagy, has proven to be beneficial in maintaining cellular and cardiac function in the face of multiple proteotoxic insults, holding open the possibility of targeting these processes for the development of effective therapeutics. Objective: Here, we undertake an unbiased, total genome screen for RNA transcripts and their protein products that affect aggregate accumulations in the cardiomyocytes. Methods and Results: Primary mouse cardiomyocytes that accumulate aggregates as a result of a mutant CryAB (αB-crystallin) causative for human desmin-related cardiomyopathy were used for a total genome-wide screen to identify gene products that affected aggregate formation. We infected cardiomyocytes using a short hairpin RNA lentivirus library in which the mouse genome was represented. The screen identified multiple candidates in many cell signaling pathways that were able to mediate significant decreases in aggregate levels. Conclusions: Subsequent validation of one of these candidates, Jak1 (Janus kinase 1), a tyrosine kinase of the nonreceptor type, confirmed the usefulness of this approach in identifying previously unsuspected players in proteotoxic processes. |
| Databáze: | OpenAIRE |
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