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An in vitro model of the regenerative phase of the human endometrial cycle was developed in order to study the growth of Chlamydia trachomatis during the period following menses. Glandular epithelial fragments were prepared from curettings of endometria and explanted onto coated substrata. Epithelial cells migrated rapidly from the explant in a fashion which closely mimicked the regeneration of the surface epithelium after menses. The cultures were then experimentally infected with C. trachomatis serotype E at various times during formation of the outgrowth. Chlamydial inclusions developed both within the explants and in the outgrowing epithelial sheets. They were also found in isolated epithelial and non-epithelial cells. However, the most striking feature of chlamydial inclusion development within these cultures was the tendency for inclusions to be located in cells at the periphery of the epithelial sheets. This was partly due to the failure of the cells within the sheets to bind chlamydiae after centrifugation of the organisms onto the culture and partly due to a phenomenon similar to phagokinesis. During this process infectious chlamydial particles were cleared from the substratum by migrating cells with free motile edges, which occasionally led to internalization and inclusion development within these cells.

An in vitro Model of Chlamydia trachomatis Infection in the Regenerative Phase of the Human Endometrial Cycle