Functional expression of cAMP-dependent and independent urea transporters in Xenopus oocytes.

Examines the nature and tissue distribution of urea transporters in the kidney. Isolation of mRNA from different tissues and expression in Xenopus oocytes; Urea and methylglucose uptake; Existence of a urea transporting pathway in liver; Difference between cAMP-dependent urea transport in the renal medulla and in erythrocyte or liver; Lack of involvement of vesicular trafficking.