Human Reproduction, Vol. 14, No. 6, 1599-1605,
June 1999
© 1999 European Society of Human Reproduction and Embryology
Human decidual stromal cells express 
-smooth muscle actin and show ultrastructural similarities with myofibroblasts
Unidad de Inmunología, Instituto de Biotecnología, Universidad de Granada, E-18012 Granada, Spain
Previous reports in human and mouse material demonstrated that decidual stromal cells expressed antigens associated with haematopoietic cells, exerted immune functions, and originated from bone marrow. These findings suggested that these cells belonged to the haematopoietic lineage. We purified and expanded in culture precursors of human decidual stromal cells, and found in electron microscopic images that the ultrastructure of these cells was similar to that of myofibroblasts, which are of mesenchymal origin. The relationship between these two types of cell was confirmed by the detection (by flow cytometry) in the decidual precursors of 
-smooth muscle actin, a contractile microfilament expressed solely by smooth muscle cells, myofibroblasts and related cells. This filament was also detected in decidual stromal cells decidualized in vitro by the effect of progesterone. We also found vimentin in decidual precursors and decidualized cells. This intermediate filament has been previously reported to be expressed by all decidual stromal cells and also by myofibroblasts. Desmin, another intermediate filament expressed by myofibroblasts, was not detected in the decidual precursors; however, this filament was observed in decidualized cells. The expression of -smooth muscle actin by decidual stromal cells was also found by immunostaining in cryostat sections of early decidua. Our results suggest that decidual stromal cells are related to myofibroblasts.
Key words:
decidual stromal cell/desmin/myofibroblast/
-smooth muscle actin/vimentin
1 To whom correspondence should be addressed at: Unidad de Inmunología, Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, Universidad de Granada, 18012-Granada, Spain
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