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Collagenolytic-cathepsin and acid-proteinase activities in the rat uterus during post partum involution.

The digestion rates for haemoglobin and native, insoluble collagen were determined at pH 3.5 in extracts of uteri collected from rats at 1 to 12-days post-partum. Both activities became concentrated during the early stages of involution, but the average total collagenolytic activity for the whole uteri was sharply reduced after the second day. Haemoglobin digestion (mainly cathepsin D) was most concentrated on days 3–5 and the total activity then slowly declined during the remainder of the 12-day period. Collagenolytic activity was strongly affected by thiol activators and inhibitors whereas these had little effect upon haemoglobin digestion. It is concluded that cathepsin D has no action on native insoluble collagen during involution.