Abstract
Urinary digoxin-like factor, ADH, sodium and potassium excretion and urine osmolality were studied during the development of two pathogenically different models of hypertension, DOCA-salt (low-renin) and Gold-blatt 2 kidney-1 clip (renin-dependent). Urinary digoxin-like factor was increased in rats that were given saline (NaCl 1%) to drink, uninephrectomized-salt and DOCA-salt rats, with no significant differences between the two groups urinary ADH was elevated in DOCA-salt rats during the study, compared with uninephrectomized-salt rats. Urinary digoxin-like factor and urinary ADH were not significantly modified in Goldblatt 2 kidney-1 clip and sham-operated rats. In addition, positive correlations between digoxin-like factor urinary excretion and urinary ADH and also with sodium urinary excretion were found. These data suggest that: a) digoxin-like factor and ADH could play a role in the pathogenesis of DOCA-salt but not in Goldblatt 2 kidney-1 clip hypertension. b) A common mechanism may stimulate ADH and digoxin-like factor simultaneously. c) Digoxin-like factor plays a role in the control of urinary sodium excretion.
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