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JOURNAL ARTICLE
REVIEW
What's in a name? On fibroblast phenotype and nomenclature 1 .
Fibroblasts have long been recognized as important stromal cells, playing key roles in synthesizing and maintaining the extracellular matrix, but historically were treated as a relatively uniform cell type. Studies in recent years have revealed a surprising level of heterogeneity of fibroblasts across tissues, and even within organs such as the skin and heart. This heterogeneity may have functional consequences, including during stress and disease. While the field has moved forward quickly to begin to address the scientific import of this heterogeneity, the descriptive language used for these cells has not kept pace, particularly when considering the phenotype changes that occur as fibroblasts convert to myofibroblasts in response to injury. We discuss here the nature and sources of the heterogeneity of fibroblasts, and review how our understanding of the complexity of the fibroblast to myofibroblast phenotype conversion has changed with increasing scrutiny. We propose that the time is opportune to reevaluate how we name and describe these cells, particularly as they transition to myofibroblasts through discrete stages. A standardized nomenclature is essential to address the confusion that currently exists in the literature as to the usage of terms like myofibroblast and the description of fibroblast phenotype changes in disease.
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