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Updated: Feb 11, 2026
Fabrication of 3D Cardiac Microtissue Arrays using Human iPSC-Derived Cardiomyocytes, Cardiac Fibroblasts, and Endothelial Cells
Published on: March 14, 2021
Unveiling Human Cardiac Fibroblast Membrane Proteome
Maria João Sebastião1,2, Rute Pereira1,2, Margarida Serra1,2
1Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. Da República, 2780-157, Oeiras, Portugal.
Insights
Researchers identified novel membrane proteins specific to human cardiac fibroblasts (hCFs). This discovery aids in distinguishing hCFs from other cardiac cells, advancing fibrosis and homeostasis research.
Area of Science:
- Cardiovascular Biology
- Proteomics
- Cellular Biology
Background:
- Cardiac fibroblasts (CFs) are crucial for heart homeostasis and fibrosis.
- Current CF markers lack specificity, hindering research and identity confirmation.
- Distinguishing CFs from similar cardiac cell populations remains a challenge.
Purpose of the Study:
- To comprehensively analyze the membrane proteome of human cardiac fibroblasts (hCFs).
- To identify unique membrane proteins that can serve as specific markers for hCFs.
- To advance the understanding of hCF function in cardiac health and disease.
Main Methods:
- Utilized advanced mass spectrometry-based proteomic tools.
- Analyzed membrane-enriched protein fractions from hCFs.
- Compared hCF proteome data with cardiac stem cells, mesenchymal stem cells, and dermal fibroblasts.
Main Results:
- Identified a total of 1478 proteins, with 774 (52%) being membrane proteins.
- Discovered a subset of 30 membrane proteins exclusively found in hCFs.
- Established a proteomic dataset for hCF membrane proteins.
Conclusions:
- The identified proteins provide a potential molecular signature for hCFs.
- This work represents a significant step towards reliable hCF identification and isolation.
- Findings will facilitate future research on membrane proteins critical for hCF function in cardiac homeostasis and disease.
Abstract:
Cardiac fibroblasts (CFs) are one of the main cell populations in the heart and play important roles in tissue homeostasis and myocardial fibrosis. The study of these cells has been hampered by the lack of reliable membrane markers: none of the antigens currently used for characterization and isolation of CFs is unique for this cell type. This issue has also raised doubts regarding a distinct identity of cardiac fibroblasts when compared to other myocardium cell populations with similar morphologies. In this work, we report a comprehensive description and functional analysis of human CFs (hCFs) membraneenriched fraction proteome by advanced mass spectrometry-based proteomic tools. A total number of 1478 proteins were identified, including 774 membrane proteins (52%). We also report the identification of a subset of 30 membrane proteins that in this workflow were only identified in hCFs by comparison with the membrane-enriched proteome lists of human cardiac stem cells, human mesenchymal stem cells, and human dermal fibroblasts. The data reported in this work are a valuable source of information for further studies aiming at defining a membrane molecular signature of human cardiac fibroblasts (hCFs), and a step forward in research regarding membrane proteins with key roles in hCF function in homeostasis and disease.
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