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To study the role of epithelial-mesenchymal interactions in myometrial development, uteri from neonatal Balb/c mice 1 to 60 days postpartum were utilized. Intact (untrypsinized) uteri, trypsinized but unseparated uteri, homotypic uterine tissue recombinants (separated-recombined), or uterine mesenchyme alone were grafted beneath the renal capsule of syngeneic female hosts and grown for 1 mo. Uterine mesenchyme from 1-day mice grafted alone produced small amounts of smooth muscle, most of which was associated with vasculature, whereas uterine mesenchyme from older donors possessing a rudimentary myometrium at the time of grafting formed intermediate amounts of myometrium (actin-positive smooth muscle bundles). In contrast, all specimens containing epithelium (intact, trypsinized, and separated-recombined) developed large amounts of myometrium. Uterine epithelia from neonatal through adult stages were equally effective in permissively inducing myometrial development in 1-day uterine mesenchyme. From these data, it is apparent that uterine epithelium plays an important promotional role in the differentiation and possibly the spatial organization of the myometrium.

Role of Uterine Epithelium in the Development of Myometrial Smooth Muscle Cells1