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DNA ACTIVITY IN THE ENDOMETRIAL STROMA OF THE CYCLING RAT AS MEASURED BY FEULGEN STAINING AND BY [³H]THYMIDINE INCORPORATION

By using cytophotometry, Fautrez (1966) and his colleagues have shown in a variety of hormonal receptors (i.e. thyroid, adrenals, ovary and vagina) that specific stimulation leads to an increase of Feulgen-measured DNA within the nuclei of target cells. According to these authors, this phenomenon is not necessarily related to an enhanced mitotic rate but would witness to a hormonedependent metabolic activity.

As similar data were obtained in the uterus of spayed mice (Leroy, Manavian & Hubinont, 1967) and rats (Leroy & Manavian, 1969), the present work was undertaken in order to verify if this concept is applicable to the endometrial stroma during the oestrous cycle.

The oestrous cycles of groups of four animals (Wistar strain) were followed by daily vaginal smears and animals were killed around mid-day at various