Karyomegaly of tubular cells as early stage marker of the nephrotoxicity induced by ochratoxin A in rats.
Cases of karyomegaly were described by Sclare and by Mihatch in patients affected with tubular-interstitial nephropathy. The Karyomegalic cells showed enlarged nuclei with accumulation of genetic material. No aetiology was suggested. Our study of rats experimentally intoxicated by ochratoxin A, a well-known nephrotoxic compound, indicates the presence of karyomegaly with alteration of the tubular tissue. In control animals no karyomegalic cells were detected. These observations suggest that karyomegaly with megacytosis may be caused by the nephrotoxic ochratoxin A in the kidney. In addition abnormal mitosis together with karyomegalic cells were observed at an earlier stage of the intoxication (30 days) suggesting possible regeneration if the OTA insults are stopped. After 90 days of treatment, the degeneration increased and only karyomegalic and apoptotic-like cells were observed indicating that the regeneration no longer occurs and that the degeneration becomes irreversible.
Maaroufi
K
K
Laboratoire de Biochimie et de Toxicologie Moléculaire, Faculté de Médecine Dentaire, Tunisia.
Zakhama
A
A
Baudrimont
I
I
Achour
A
A
Abid
S
S
Ellouz
F
F
Dhouib
S
S
Creppy
E E
EE
Bacha
H
H
D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D002467:Cell Nucleus / Q000187:drug effects* / Q000473:pathology*; D007668:Kidney / Q000033:anatomy & histology / Q000187:drug effects / Q000378:metabolism / Q000473:pathology; D007674:Kidney Diseases / Q000139:chemically induced* / Q000235:genetics / Q000473:pathology*; D007684:Kidney Tubules / Q000187:drug effects / Q000378:metabolism / Q000473:pathology / Q000648:ultrastructure*; D009183:Mycotoxins / Q000097:blood / Q000493:pharmacokinetics / Q000633:toxicity* / Q000652:urine; D009793:Ochratoxins / Q000097:blood / Q000493:pharmacokinetics / Q000633:toxicity* / Q000652:urine; D009929:Organ Size / Q000187:drug effects; D051381:Rats; D017208:Rats, Wistar
D009183:Mycotoxins; D009793:Ochratoxins; C025589:ochratoxin A