The effect of sodium intake on cystinuria with and without tiopronin treatment.

Abstract:

:As with many other amino acids the transport of cystine across the tubular epithelium is coupled to a parallel transport of sodium. We have studied the effect of a sodium-restricted diet on the urinary excretion of cystine in 13 patients with cystinuria, 7 of whom were treated with the SH compound tiopronin (2-mercaptopropionylglycine). Five of the patients with tiopronin and 5 without were also given sodium bicarbonate. The patients were instructed to follow a sodium-restricted diet during three periods of 2 weeks each. Four levels of sodium intake were obtained including the preexperimental unrestricted diet. The average 24-hour excretion of free cystine increased by 3.1 mumol (0.75 mg) for each millimole increase in urinary sodium (p < 0.001). There was a greater sodium-related increase in excretion of cystine among patients without tiopronin treatment compared with the group with tiopronin (p < 0.01). Withdrawal of sodium bicarbonate resulted in a decrease in the 24-hour cystine excretion (p < 0.05). In the patients treated with tiopronin the excretion of the mixed disulfide increased with increasing urinary sodium (p < 0.05) suggesting a sodium-dependent active tubular reabsorption of this compound as well. We conclude that in spite of a defective proximal tubular reabsorption of cystine in cystinuria the reabsorption can be increased by restricting the intake of sodium. This effect of sodium may have clinical consequences for some cystinuric patients.

journal_name

Nephron

journal_title

Nephron

authors

Lindell A,Denneberg T,Edholm E,Jeppsson JO

doi

10.1159/000188760

subject

Has Abstract

pub_date

1995-01-01 00:00:00

pages

407-15

issue

4

eissn

1660-8151

issn

2235-3186

journal_volume

71

pub_type

临床试验,杂志文章

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