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METAPLASIA IN ENDOCERVICAL TISSUE MAINTAINED IN ORGAN CULTURE–AN EXPERIMENTAL MODEL

Endocervical columnar epithelium with stroma intact, was maintained in organ culture for up to ten days. Many explants showed a progressive dedifferentiation, pyknosis and eventual loss of columnar cells with a gradual replacement of these with metaplastic cells apparently of stromal origin. This was a progression of changes similar to squamous metaplasia seen in vivo. Studies of the surface characteristics of the cultured tissue, with the scanning electron microscope, showed a change of cell type from columnar cells with closely packed micro‐villi, to a flattened squamous type with interdigitating cell boundaries and a mixed surface structure of micro‐ridges and micro‐villi.