Renal urinary kallikrein in normotensive and hypertensive rats during enhanced excretion of water and electrolytes.
1. Urinary kallikrein excreted by normal rats is significantly increased (P less than 0-001) 2 h after: (a) water loading, (b) water loading plus frusemide, 0-27 mmol (10 mg) per rat, (c) salt loading. In water-loaded rats, 5 i.u. of renin strikingly reduced kallikrein excretion (P less than 0-01) but considerably increased sodium excretion (P less than 0-001). 2. Renal kallikrein, measured by its kininogenase activity within 2 h of water loading, was significantly increased (P less than 0-05); after water loading and frusemide it was 40% decreased (P less than 0-001) and after salt loading it was reduced by approximately 50% (P less than 0-02). Renin did not change renal kallikrein. 3. Severely hypertensive (one-kidney) rats (blood pressure greater than 150 mmHg) showed no increase of urinary kallikrein after water loading, although there was a marked natriuresis, in moderately hypertensive rats (blood pressure less than 150 mmHg) urinary kallikrein was only one-third of that observed in control normotensive rats, after an equal degree of water loading.
D000818:Animals; D004231:Diuresis; D005260:Female; D005665:Furosemide / Q000494:pharmacology; D006973:Hypertension / Q000652:urine*; D007610:Kallikreins / Q000652:urine*; D007668:Kidney / Q000187:drug effects; D011188:Potassium / Q000652:urine; D051381:Rats; D012964:Sodium / Q000652:urine
D005665:Furosemide; D012964:Sodium; D007610:Kallikreins; D011188:Potassium