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Cytokine-Mediated Alterations of Human Cardiac Fibroblast's Secretome.

ABSTRACT: Fibroblasts contribute to approximately 20% of the non-cardiomyocytic cells in the heart. They play important roles in the myocardial adaption to stretch, inflammation, and other pathophysiological conditions. Fibroblasts are a major source of extracellular matrix (ECM) proteins whose production is regulated by cytokines, such as TNF-α or TGF-β. The resulting myocardial fibrosis is a hallmark of pathological remodeling in dilated cardiomyopathy (DCM). Therefore, in the present study, the secretome and corresponding transcriptome of human cardiac fibroblasts from patients with DCM was investigated under normal conditions and after TNF-α or TGF-β stimulation. Secreted proteins were quantified via mass spectrometry and expression of genes coding for secreted proteins was analyzed via Affymetrix Transcriptome Profiling. Thus, we provide comprehensive proteome and transcriptome data on the human cardiac fibroblast's secretome. In the secretome of quiescent fibroblasts, 58% of the protein amount belonged to the ECM fraction. Interestingly, cytokines were responsible for 5% of the total protein amount in the secretome and up to 10% in the corresponding transcriptome. Furthermore, cytokine gene expression and secretion were upregulated upon TNF-α stimulation, while collagen secretion levels were elevated after TGF-β treatment. These results suggest that myocardial fibroblasts contribute to pro-fibrotic and to inflammatory processes in response to extracellular stimuli.

SUBMITTER: Brauninger H

PROVIDER: S-EPMC8617966 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:RationaleCardiac progenitor cells are an attractive cell type for tissue regeneration, but their mechanism for myocardial remodeling is still unclear.ObjectiveThis investigation determines how chronological age influences the phenotypic characteristics and the secretome of human cardiac progenitor cells (CPCs), and their potential to recover injured myocardium.Methods and resultsAdult (aCPCs) and neonatal (nCPCs) cells were derived from patients aged >40 years or <1 month, respectively, and their functional potential was determined in a rodent myocardial infarction model. A more robust in vitro proliferative capacity of nCPCs, compared with aCPCs, correlated with significantly greater myocardial recovery mediated by nCPCs in vivo. Strikingly, a single injection of nCPC-derived total conditioned media was significantly more effective than nCPCs, aCPC-derived TCM, or nCPC-derived exosomes in recovering cardiac function, stimulating neovascularization, and promoting myocardial remodeling. High-resolution accurate mass spectrometry with reverse phase liquid chromatography fractionation and mass spectrometry was used to identify proteins in the secretome of aCPCs and nCPCs, and the literature-based networking software identified specific pathways affected by the secretome of CPCs in the setting of myocardial infarction. Examining the TCM, we quantified changes in the expression pattern of 804 proteins in nCPC-derived TCM and 513 proteins in aCPC-derived TCM. The literature-based proteomic network analysis identified that 46 and 6 canonical signaling pathways were significantly targeted by nCPC-derived TCM and aCPC-derived TCM, respectively. One leading candidate pathway is heat-shock factor-1, potentially affecting 8 identified pathways for nCPC-derived TCM but none for aCPC-derived TCM. To validate this prediction, we demonstrated that the modulation of heat-shock factor-1 by knockdown in nCPCs or overexpression in aCPCs significantly altered the quality of their secretome.ConclusionsA deep proteomic analysis revealed both detailed and global mechanisms underlying the chronological age-based differences in the ability of CPCs to promote myocardial recovery via the components of their secretome.

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Cytokine-Mediated Alterations of Human Cardiac Fibroblast's Secretome.

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