In this study, thirty adult albino rats were used. They were classified as three groups; one control (10 rats) and two experimental groups (10 rats each). Rats of the first experimental group (group I) had received 3.5 mg of the broad-spectrum antifungal Nizoral every day for two weeks. While rats of the second experimental group (group II) had received the same dose for one month. At the end of drug administration, animals of both control and experimental groups were anaesthetized and the kidneys were enucleated and processed for histological and ultrastructural studies. Light microscopic examination of all specimens of control rats was similar and had revealed normal structure for the kidney. Comparing with control, specimens of group I experimental rats showed hypercellularity and hypertrophy of the capillary tuft of renal corpuscles, mild degree of degeneration affecting cells of the convoluted tubules, obliteration of tubular lumens, vascular congestion, presence of few scattered haemorrhagic spots and mild thickening of the basement membranes of the glomeruli and convoluted tubules as a result of deposition of extraordinary amount of collagen fibers. As regards group II experimental rats, the histological examination of rat kidney had revealed marked hypercellularity and proliferation of glomerular capillary tuft, marked hydropic degeneration of the cellular cytoplasm of the convoluted tubules, partial destruction of the brush border, hyaline red casts, massive tubulo-interstitial haemorrhage and marked deposition of extraordinary amount of collagen fibers around glomerular and tubular basement membrane.
At the electron microscopic level, specimens of the control group revealed normal structure of the rat kidney. In group I experimental rats, it was observed that the ultrastructural changes were not symmetrical, the basement membrane thickening was the prominent finding as well as fusion of minor and major foot processes which occurred at the expense of the filtration slits which were markedly reduced or completely obliterated and cellular degeneration of the convoluted tubules as evidenced from the presence of large number of degenerated mitochondria. Most of them were swollen or lost their internal cristae. But few of them clarified a destruction of a local area of the outer membrane. In group II experimental rats, it was observed focal widened areas of the glomerular basement membranes, fusion of some minor foot processes and obliteration of the filtration slits, and mitochondrial swelling and degeneration.
In conclusion, the long term administration of Nizoral induced variable degrees of renal damage. |
