Water, acidosis, and experimental pyelonephritis.

Area of Science:

• Nephrology
• Infectious Diseases
• Urology

Background:

• Escherichia coli (E. coli) is a common cause of pyelonephritis.
• Renal medullary composition influences susceptibility to kidney infections.

Purpose of the Study:

• To investigate the impact of water restriction and ammonium chloride-induced acidosis on E. coli pyelonephritis in rats.
• To determine the role of renal medullary hypertonicity in susceptibility to kidney infection.

Main Methods:

• Rats were subjected to water restriction or fed ammonium chloride solution to induce systemic acidosis.
• Urinary osmolality and susceptibility to E. coli pyelonephritis were assessed.
• The effect of ad libitum water access during acidosis was also evaluated.

Main Results:

• Water restriction significantly increased the incidence of coliform pyelonephritis.
• Ammonium chloride acidosis, leading to increased urinary osmolality, also predisposed rats to pyelonephritis.
• Ad libitum water access during acidosis reduced or eliminated pyelonephritis susceptibility, despite systemic acidosis.

Conclusions:

• Renal medullary hypertonicity, induced by water restriction or acidosis, is a critical factor in susceptibility to pyelonephritis.
• Water diuresis may counteract the complement-inactivating effects of ammonium chloride acidosis.
• Maintaining normal urinary osmolality is crucial for preventing kidney infections.