Abstract
The human uterus mainly consists of two layers: an inner endometrium and an outer
layer, the myometrium, made of smooth muscle. The uterus is characterized by its unique
capacity for regeneration. This capacity permits cyclical regeneration and remodeling
of the tissue over the course of a woman's reproductive life. During each menstrual
cycle, the endometrium regenerates, and the uterus enlarges to make room for fetal
growth. This cyclic physiologic pattern suggests that myometrial stem/progenitor cells
are present in the tissue and play a role in myometrial functions. Our group (and
others) recently characterized and isolated putative stem/progenitor cells in the
myometrium. These findings are permitting a better understanding of myometrial physiology
and pathology. We review current studies of myometrial stem/progenitor cells and suggestions
that, in combination with hypoxia, these cells may contribute to uterine remodeling
during pregnancy and the formation of myomas.
Keywords
somatic stem cells - myomas (fibroids) - hypoxia - pregnancy - myometrium