Abstract
The effect of glucocorticoids on renal net glucose release in vivo in normal and diabetic rats was studied by the isotope-dilution method. Administration of hydrocortisone to normal fed rats increased renal net glucose release from 0.93 +/- 0.25 to 2.27 +/- 0.21 mg . dl-1 . min-1 and increased its contribution to blood glucose from 27.0 +/- 4.5 to 46.6 +/- 4.0%. The renal net glucose release and its contribution to blood glucose in adrenalectomized rats were 0.40 +/- 0.06 mg . dl-1 . min-1 and 16.3 +/- 1.4%, respectively, significantly less than those of normal control rats, and these parameters were raised to the levels of normal control rats by the administration of hydrocortisone. In rats with streptozotocin-induced diabetes, the renal net glucose release and its contribution to blood glucose were significantly increased to 2.22 +/- 0.51 mg . dl-1 . min-1 and 46.7 +/- 4.9%, respectively, and these parameters were normalized by adrenalectomy. These data indicate that glucocorticoids play an important role in regulation of renal net glucose release and its contribution to blood glucose in both normal and diabetic rats.
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