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Changes in pyruvate kinase isozymes of rat small intestine during development and the synergistic effect on them of thyroid and glucocorticoid hormones.

Pyruvate kinase isozymes in rat small intestine changed markedly during the postnatal period. The activities of type M2 subunits rapidly increased before weaning, while those of type L subunits decreased slightly. The administration of hydrocortisone induced normal changes prematurely, whereas the administration of thyroxine increased their extent. On simultaneous administration, the two hormones had synergistic effects.