Abstract
The mechanisms underlying the menstrual lysis leading to shedding of the human endometrium and its accompanying bleeding are still largely unknown. In particular, whether breakdown of the endometrial fibrillar extra-cellular matrix that precedes bleeding depends on aspartic-, cysteine-, serine-, or metalloproteinases remains unclear. In the present study, menstrual regression of the human endometrium was mimicked in organ culture. Whereas sex steroids could preserve tissue integrity only in nonperimenstrual explants, matrix breakdown upon sex steroid deprivation was completely and reversibly inhibited at all stages of the menstrual cycle by specific inhibitors of matrix metalloproteinases, but not by inhibitors of the other classes of proteinases. Matrix metalloproteinases are thus identified as the key class of proteinases involved in the initiation of menstruation.
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