Vergleichende Untersuchungen �ber die h�matogene und die ascendierende Pyelonephritis bei Ratten

An experimental model for ascending acute pyelonephritis caused by Escherichia coli or proteus in rats

Experimental, ascending acute pyelonephritis in rats was produced by injecting 0 x 5 ml of 10(9) bacteria/ml into the urinary bladder via the urethra. No traumatic manipulation of the ureters of kidneys was necessary. A grading system for kidney lesions based on macro- and microscopical examination was used. The capacity of different Escherichia coli and proteus strains to induce acute pyelonephritis was tested, and the E. coli 06K13H1 strain and the Proteus mirabilis 03H1 strain were especially capable of causing urinary tract infection. For the P. mirabilis 03H1 strain, a dominance of right kidney lesions was noted in contrast to the E. coli 06K13H1 strain which did not show any side preference.

An electronmicroscopic study of experimental hematogenous pyelonephritis

This paper consists of an electronmicroscopic study of hematogenous experimental pyelonephritis. In the first 5 days cell degenerations mitochondrial swellings, slight lysosomal increase, rupture of the apical cell membranes, deterioration of the basal labyrinth and a leucocyte-predominant cell infiltration into the interstitial tissue were observed. On the 10th day, beside these common findings, the complete necrosis of the tubular cells was also observed and was supposed to be the result of an increase of lysosomes directly proportional with elapsed time and of the destruction and extreme contraction of the basal membrane. The cause of these destructions was supposed to be primary schaemia and probably the antigen-antibody-complement complex.