Comparing the transcriptional profile of mesenchymal cells to cardiac and skeletal muscle cells.

Marrow-derived stroma cells (MSCs) can differentiate into multiple lineages including myogenic cells. However, the molecular mechanisms that direct MSCs to each differentiation pathway are poorly understood. Our study was designed to gain insights into the potential regulatory pathways that may assist in defining MSC commitment and differentiation properties. This will delineate the similarities or differences in the expression of genes between several cell types of mesenchymal origin. In this study, we established in vitro models, which allow following the discrete stages of differentiation of cardio- and myogenic-cells compared with MSC. Gene expression of each cell type at several stages of their differentiation path was evaluated by means of Affymetrix Gene Chips. Bioinformatic clustering of genes confirmed that with time in culture the myogenic cells ceased proliferating and commenced with differentiation. The expression profile analysis revealed the similarity and differences between myogenic cells and MSCs. This research compared at the molecular levels snapshots of gene expression patterns and elaborated on the overlap or differences between the analyzed cellular systems. Our results shed light on gene profiles of cells throughout their differentiation pathways. Establishing the gene signature of the differentiation process of cells that belong to several mesenchymal lineages may contribute to the understanding of molecular pathways that underlay mesenchymal tissue remodeling.