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Mechanical stretch induced transcriptomic profiles in cardiac myocytes II

ABSTRACT: The effect of cyclic mecanical stretch on cardiac gene expression was studied in neonatal rat ventricular myocytes (NRVMs).

ORGANISM(S): Rattus norvegicus

PROVIDER: GSE107551 | GEO | 2018/03/17

REPOSITORIES: GEO

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Mechanical stretch induced transcriptomic profiles in cardiac myocytes [24-48 hours]

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Cardiac Stretch-Induced Transcriptomic Changes are Axis-Dependent

Project description:The goal of this study was to examine the effect of the major axis of biaxial mechanical stretch on cardiac myocyte gene expression and to identify the signaling pathways and transcription factors regulating these changes. Neonatal cardiac myocytes were cultured on a micropatterned substrate, and the primary stretch axis was applied either parallel or transverse to the myofibril direction. RNA sequencing was conducted to study whole genomic expression changes after acute cardiac myocyte stretch. The results showed a more robust gene response to longitudinal than to transverse stretch. After 30 minutes of stretch, 53 and 168 genes were considered differentially expressed (DE) from transverse and longitudinal stretch, respectively. After 4 hours, the number of DE genes increased to 795 in longitudinal stretch while it decreased to 35 in transverse stretch. Gene ontology term (GO) analysis indicated enrichment of TF activity and protein kinase activity by both stretch axes; whereas longitudinal but not transverse stretch caused expression of genes involved in sarcomere organization and cytoskeletal protein binding.

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