Related Experiment Video
Updated: May 5, 2026
Induction of Myocardial Infarction in Adult Zebrafish Using Cryoinjury
Published on: April 18, 2012
Gene expression and cellular changes in injured myocardium of Ciona intestinalis
Serenity Stokes1, Pooja Pardhanani Palmer2, Jeremy L Barth3
1Central Piedmont Community College, Natural Sciences Division, Charlotte, NC, United States.
Insights
Ciona intestinalis heart injury triggers significant gene expression changes, including upregulation of Fgf9/16/20. These findings offer insights into cardiac myocyte proliferation and regeneration mechanisms.
Area of Science:
- Cardiovascular Biology
- Regenerative Medicine
- Comparative Genomics
Background:
- Ciona intestinalis serves as a valuable invertebrate model for cardiovascular research.
- The organism exhibits tissue regeneration capabilities, making its cardiac myocyte proliferation mechanisms intriguing.
- Understanding cardiac repair in Ciona can provide insights into chordate cardiovascular biology.
Purpose of the Study:
- To identify genes differentially expressed in Ciona hearts following injury.
- To correlate gene expression changes with cellular alterations in the myocardium.
- To explore the regulatory mechanisms of cardiac myocyte proliferation.
Main Methods:
- Microarray analysis of RNA from normal and ligated Ciona hearts.
- Gene expression profiling after 24- and 48-hour recovery periods.
- Histological examination of injured myocardium.
Main Results:
- Ligation injury resulted in differential expression of 223 genes (5.8% false discovery rate).
- 117 differentially expressed genes have known human orthologs (68 upregulated, 49 downregulated).
- Upregulated genes include Fgf9/16/20, IGFBP, and Rab11b; a junctophilin ortholog was downregulated.
- Histology revealed thickened myocardium in injured hearts.
Conclusions:
- Cardiac injury in Ciona induces significant, specific gene expression changes.
- Identified genes provide potential targets for studying cardiac regeneration.
- This study links molecular changes to cellular responses, advancing understanding of cardiac myocyte proliferation in chordates.
Abstract:
Ciona intestinalis is an invertebrate animal model system that is well characterized and has many advantages for the study of cardiovascular biology. The regulatory mechanisms of cardiac myocyte proliferation in Ciona are intriguing since regeneration of functional tissue has been demonstrated in other organs of Ciona in response to injury. To identify genes that are differentially expressed in response to Ciona cardiac injury, microarray analysis was conducted on RNA from adult Ciona hearts with normal or damaged myocardium. After a 24- or 48-h recovery period, total RNA was isolated from damaged and control hearts. Initial results indicate significant changes in gene expression in hearts damaged by ligation in comparison to control hearts. Ligation injury shows differential expression of 223 genes as compared to control with limited false discovery (5.8%). Among these 223 genes, 117 have known human orthologs of which 68 were upregulated and 49 were downregulated. Notably, Fgf9/16/20, insulin-like growth factor binding protein and Ras-related protein Rab11b were significantly upregulated in injured hearts, whereas expression of a junctophilin ortholog was decreased. Histological analyses of injured myocardium were conducted in parallel to the microarray study which revealed thickened myocardium in injured hearts. Taken together, these studies will connect differences in gene expression to cellular changes in the myocardium of Ciona, which will help to promote further investigations into the regulatory mechanisms of cardiac myocyte proliferation across chordates.
