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Enzyme activities in different cell compartments of the involuting rat myometrium.

Marker enzymes for various intracellular fractions were measured in rat uterus myometrium during the post-partum involution. Following a lag phase of 48 h after delivery, the activities of the cytoplasmic enzymes aldolase, glucose-6-phosphate dehydrogenase and creatine kinase, decreased at equal rates. The plasma membrane marker 5′-nucleotidase, again after a lag phase of 48 h, showed a decrease in activity which was parallel to that of the cytoplasmic enzymes when allowance was made for the geometry of the cell. 
 
 
 
The mitochondrial glutamate dehydrogenase and succinate dehydrogenase activities decreased in parallel together after a lag phase of 72 h. The significantly longer lag phase of the mitochondrial enzymes can be explained in terms of the importance of the mitochondria as a source of the energy which is necessary for intracellular protein degradation. 
 
 
 
The activity of the lysosomal acid phosphatase showed no significant decrease until the involution of the tissue was essentially complete. 
 
 
 
The activities of cytosol, mitochondria and plasma membrane enzymes all fell during involution to levels below those measured in non-pregnant control animals. This can be explained by the absence of estrogenic stimulation of the uterus during the post-partum period, which results from suppression of ovarian function by lactation.