The peptide material of the 2nd and 3rd fractions of the natriuretic factor did not affect the passive sodium transport while inhibiting the active transport in slices of the rat kidney cortex. This inhibition was accompanied by a decrease of both the succinic dehydrase system and Na+, K+-activated ATPase activities in the slices. The natriuresis caused by the natriuretic factor seems to be due to the inhibition of the active sodium transport.

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