Transcriptional remodeling of cardiomyocytes and fibroblasts during post-myocardial infarction recovery.
Cardiomyocytes and fibroblasts exhibit significant transcriptional changes following myocardial infarction, indicating a complex recovery process that may inform future therapeutic strategies.
Where it sits
this study against the rest of the mgf (mechano growth factor) corpusSummary and findings
This study investigated transcriptional changes in cardiomyocytes and fibroblasts in mouse hearts following myocardial infarction (MI) at baseline, 1 week, and 4 weeks post-MI. Significant transcriptional shifts were observed in both cell types, indicating a response to ischemic stress. The findings may inform potential molecular targets for future research.
Abstract
Myocardial infarction (MI) results from reduced coronary blood flow, leading to oxygen deprivation and impaired systolic and diastolic function, which increases the risk of cardiac arrhythmias. Various cardiac cell types respond to this stress to preserve heart function, but the precise, cell-type-specific mechanisms remain poorly understood. To investigate these responses, we performed single-nucleus RNA sequencing (snRNA-seq) on left ventricular tissue from mouse hearts at baseline (Day 0) and at 1 and 4 weeks post-MI. This enabled us to characterize transcriptional changes across major cardiac cell types. We observed significant shifts in the transcriptional states of cardiomyocytes (CMs) and fibroblasts (FBs) cell populations following MI. CMs showed a major transcriptional modulation from healthy to diseased state during early chronic phase of post-MI, however, the recovery phenotype was observed during the late chronic phase, suggesting a natural compensatory response of CMs against the ischemic stress. FBs exhibited dynamic transcriptional changes consistent with roles in post-MI healing and fibrosis. In addition, inferred alterations in cell-cell communication networks highlighted changes in intercellular signaling pathways, shedding light on disrupted crosstalk in the injured heart. Together, our findings provide a comprehensive transcriptional landscape of cardiac cell populations, especially CMs and FBs, following MI and identify potential molecular targets for therapeutic intervention.
Background
This paper addresses the biological processes involved in the recovery of heart tissue following a myocardial infarction, focusing on the transcriptional changes in cardiomyocytes and fibroblasts. Prior research has indicated that cellular remodeling is critical for cardiac repair, but the specific roles of various growth factors, including MGF, remain unclear. Understanding these processes is essential for developing targeted therapies for heart disease.
Methods
Not reported in abstract.
Results
Not reported in abstract.
Interpretation
Not reported in abstract.
Key findings
- Not reported in abstract.
Limitations
- Not reported in abstract.