cardiovascular system
• mean blood pressure of anesthetized mice is lower than in controls
• mean blood pressure of unanesthetized and unrestrained males is lower than in control throughout the 24 hour observation period, with a significant difference during the dark cycle
• hypotension is exacerbated by a low-salt diet
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homeostasis/metabolism
• arterial bicarbonate levels are higher
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• mice fed a low-salt diet exhibit higher plasma aldosterone levels than those on a regular diet
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• plasma potassium shows a trend toward hyperkalemia however, renal handling of potassium is normal
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• plasma chloride levels are lower in 10-12 week old mice
• mice fed a low-salt diet maintain the hypochloremia that is seen on a regular diet
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• renal loss of chloride, with fractional excretion of chloride increased by 1.79-fold and absolute excretion of chloride increased by 1.96-fold
• mice fed a low-salt diet maintain the chloriuresis that is seen on a regular diet
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• the reduction of urinary sodium excretion is slower in mutants from regular to low-salt diet, indicating defects in low-salt-induced renal reabsorption
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• renal loss of sodium, with fractional excretion increased by 1.52-fold and absolute excretion increased by 1.66-fold
• mice fed a low-salt diet maintain the natriuresis that is seen on a regular diet
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• arterial bicarbonate levels are higher, however arterial pH is maintained at similar levels to controls, indicating compensated metabolic alkalosis
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renal/urinary system
• renal loss of chloride, with fractional excretion of chloride increased by 1.79-fold and absolute excretion of chloride increased by 1.96-fold
• mice fed a low-salt diet maintain the chloriuresis that is seen on a regular diet
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• renal loss of sodium, with fractional excretion increased by 1.52-fold and absolute excretion increased by 1.66-fold
• mice fed a low-salt diet maintain the natriuresis that is seen on a regular diet
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• the reduction of urinary salt excretion (chloride and sodium) is slower in mutants from regular to low-salt diet, indicating defects in low-salt-induced renal reabsorption
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• the reduction of urinary sodium excretion is slower in mutants from regular to low-salt diet, indicating defects in low-salt-induced renal reabsorption
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• urinary volume is higher in 10-12 week old mice
• however, glomerular filtration rates are similar to wild-type mice and urinary osmotic pressure is normal
• mice fed a low-salt diet for 5 days exhibit a more severe urinary volume loss than on a regular diet (53% vs. 31% loss)
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growth/size/body
• mice fed a low-salt diet for 5 days show a decrease in body weight
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hematopoietic system
• mice fed a low-salt diet exhibit higher hematocrit levels than on a regular diet
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