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. 1983 Oct;72(4):1298–1313. doi: 10.1172/JCI111086

Chlorpropamide action on renal concentrating mechanism in rats with hypothalamic diabetes insipidus.

E Kusano, J L Braun-Werness, D J Vick, M J Keller, T P Dousa
PMCID: PMC370414  PMID: 6313759

Abstract

To determine vasopressin (VP)-potentiating effect of chlorpropamide (CPMD), we studied the effect of CPMD in vivo and in vitro in kidneys and in specific tubule segments of rats with hypothalamic diabetes insipidus, homozygotes of the Brattleboro strain (DI rats). Rats on ad lib. water intake were treated with CPMD (20 mg/100 g body wt s.c. daily) for 7 d. While on ad lib. water intake, the urine flow, urine osmolality, urinary excretion of Na +, K +, creatinine, or total solute excretion did not change. However, corticopapillary gradient of solutes was significantly increased in CPMD-treated rats. Higher tissue osmolality was due to significantly increased concentration of Na +, and to a lesser degree urea, in the medulla and papilla of CPMD-treated rats. Consequently, the osmotic gradient between urine and papillary tissue of CPMD-treated rats (delta = 385 +/- 47 mosM) was significantly (P less than 0.001) higher compared with controls (delta = 150 +/- 26 mosM). Minimum urine osmolality after water loading was higher in CPMD-treated DI rats than in controls. Oxidation of [14C]lactate to 14CO2 coupled to NaCl cotransport was measured in thick medullary ascending limb of Henle's loop (MAL) microdissected from control and CPMD-treated rats. The rate of 14CO2 production was higher (delta + 113% +/- 20; P less than 0.01) in CPMD-treated MAL compared with controls, but 14CO2 production in the presence of 10(-3) M furosemide did not differ between MAL from control and from CPMD-treated rats. These observations suggest that CPMD treatment enhances NaCl transport in MAL. Cyclic AMP metabolism was analyzed in microdissected MAL and in medullary collecting tubule (MCT). MCT from control and from CPMD-treated rats did not differ in the basal or VP-stimulated accumulated of cAMP. The increase in cAMP content elicited by 10(-6) M VP in MAL from CPMD-treated rats (delta + 12.0 +/- 1.8 fmol cAMP/mm) was significantly (P less than 0.02) higher compared with MAL from control rats (delta + 5.1 +/- 1.0 fmol cAMP/mm). Preincubation of MAL dissected from Sprague-Dawley rats with 10(-4) M CPMD in vitro increased cAMP accumulation in the presence of VP, but no such enhancement was found in preincubated MCT. Adenylate cyclase activity, basal or stimulated by VP, 5'guanylimidodiphosphate, or by NaF, assayed in isotonic medium did not differ between MAL or MCT from control rats and MAL or MCT from CPMD-treated rats. When assayed in hypertonic medium (800 mosM), the adenylate cyclase activity in the presence of 10(-6) M VP was significantly higher in MAL of CPMD-treated rats. MAL and MCT from control and CPMD-treated rats did not differ in the activities of cAMP phosphodiesterase. The rate of [(14)C]prostaglandin E2 by medullary and papillary microsomes was not different between the control and CPMD-treated rats; likewise, there was no difference in accumulation of immunoreactive prostaglandin E2 in the medium of in vitro incubated medullary or papillary slices prepared from control and CPMD-treated rats. Based on the findings recounted above, we propose a hypothesis that CPMD administration enhances the antidiuretic effect of VP, primarily by increasing medullary and papillary tonicity dye to increased NaCl reabsorption in MAL. There is no evidence that CPMD sensitizes collecting tubules to the action of VP, at least at the camp-generation step. Therefore, increased antidiuretic response to VP in the kidneys of CPMD-treated DI rats is due to enhanced osmotic driving force for water reabsorption (lumen-to-interstitium osmotic gradient) in collecting tubules, rather than due to increased VP-dependent water permeability of tubular epithelium.

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Selected References

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