Key result
Ischemic cardiac stromal fibroblasts exhibit altered secretion of protein mediators including CRSP2, HSP27, IL-8, Cofilin-1, and HSP90, which correspond to distinct pro-healing and pathological sub-phenotypes.
Why the study?
To screen major secreted proteins from ischemia-challenged cardiac stromal fibroblasts, assess their expression and functional role in post-ischemic left ventricle and cell culture, and phenotype fibroblasts at single-cell resolution.
Ischemia-challenged cardiac stromal fibroblasts exhibit distinct protein secretion profiles and transcriptomic sub-phenotypes that differ between MI and CABG models, offering potential translational targets for cardiac repair.
This article focuses on screening the major secreted proteins by the ischemia-challenged cardiac stromal fibroblasts (CF), the assessment of their expression status and functional role in the post-ischemic left ventricle (LV) and in the ischemia-challenged CF culture and to phenotype CF at single cell resolution based on the positivity of the identified mediators. The expression level of CRSP2, HSP27, IL-8, Cofilin-1, and HSP90 in the LV tissues following coronary artery bypass graft (CABG) and myocardial infarction (MI) and CF cells followed the screening profile derived from the MS/MS findings. The histology data unveiled ECM disorganization, inflammation and fibrosis reflecting the ischemic pathology. CRSP2, HSP27, and HSP90 were significantly upregulated in the LV-CABG tissues with a concomitant reduction ion LV-MI whereas Cofilin-1, IL8, Nrf2, and Troponin I were downregulated in LV-CABG and increased in LV-MI. Similar trends were exhibited by ischemic CF. Single cell transcriptomics revealed multiple sub-phenotypes of CF based on their respective upregulation of CRSP2, HSP27, IL-8, Cofilin-1, HSP90, Troponin I and Nrf2 unveiling pathological and pro-healing phenotypes. Further investigations regarding the underlying signaling mechanisms and validation of sub-populations would offer novel translational avenues for the management of cardiac diseases.
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Cha et al. (2024) studied Myocardial Infarction (n=8). Ischemia (in vivo MI/CABG and in vitro) vs. Non-ischemic control was evaluated on Expression levels of secreted protein mediators (CRSP2, HSP27, IL-8, Cofilin-1, HSP90). Ischemic cardiac stromal fibroblasts exhibit altered secretion of protein mediators including CRSP2, HSP27, IL-8, Cofilin-1, and HSP90, which correspond to distinct pro-healing and pathological sub-phenotypes.
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