[Glutamic dehydrogenase activities in renal tissue during experimental and human ehronie pyelonephritis (author's transl)].

OBJECTIVE

These studies are one part of systemic comparative investigations concerning biochemically feasible changes of renal cells and tissues due to chronic pyelonephritis (PN) as correlated to the histological results. The experiments aim at more detailed knowledge on the pathogenesis and conditions of the progressive chronicity of PN which could be of value for the further development of therapeutic measures. In previous papers (Esp. Path., vols. 8, 9 and 10) the author reported on the acid and alkaline phosphatase as well as on the glutaminase I activities. In the present study the glutamic dehydrogenase (GIDH) activities are analyzed.

METHODS

In 139 adult male rabbits (body weight 2.4 to 2.8 kg) unilateral pyelonephritis was experimentally induced in the left kidney. In additional 19 rabbits no PN developed despite of similar technique. 37 animals were used for controls. The animals were kept on standard diet in individual cages. Dependent on duration of the disease the 139 rabbits affected by experimental PN were divided into 6 groups: 1. Sacrification after 20 days, 2. Sacrification after 31 days, 3. Sacrification after 64 days 4. Sacrification after 100 days, 5. Sacrification after 212 days, 6. Sacrification after 261 days. The 19 rabbits which did not develop PN WERE LIKEWISE SACRIFICED AT DIFFERENT TERMS: AFTER 64 DAYS (5 ANIMALS), AFTER 100 DAYS (7 ANIMALS), AFTER 212 DAYS (7ANIMALS). These rabbits were designated "B-series". From 31 human kidneys with clinically quiescent pyelonephritic renal shrinkage wedge-shaped tissue samples were removed. Furthermore, 20 tissue samples of surgical specimens of extirpated human tumor kidneys were removed far distant from the site of the tumor. Induction of unilateral PN in the rabbits was done after the method of LEPPER (5) as modified by PRAT et al. (14). Coli of the strain O 55 K 59 were used for infection in a germ suspension of 500 millions of bacterial/ml 0.9% sterile physiological saline (control of the germ suspension by means of nephelometry). 24 hours after unilateral renal ligation each animal was i.v. administered 800-1000 millions of germs. At the end of the test the left side lesioned kidney was removed within maximally 100 sec after having been rinsed bloodless by means of cooled physiological saline (0 to 2 degrees C) during this period. On an ice-cooled glass plate the decapsulation and preparative separation of the medulla from the cortex was done using a magnifier; remnants of the capsule, hilar and fatty tissue were removed. Simultaneously tissue samples were obtained from 70 impaired kidneys and from 6 animals of the B-series (see above) for histological examination. The medullary and cortical parts were immediately swabbed with filter paper and weighed in moist state. Preparation for enzyme analysis: The renal medulla was minced and homogenized after the method of SCHMIDT, SCHMIDT and WILDHIRT (17) for 5 min at 0 degrees C...