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Cellular distribution of cell cycle-related molecules in the renal tubules of rats treated with renal carcinogens for 28 days: relationship between cell cycle aberration and carcinogenesis

  • Genotoxicity and Carcinogenicity
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Abstract

Some renal carcinogens can induce karyomegaly, which reflects aberrant cell division in the renal tubules, from the early stages of exposure. To clarify the cell cycle-related changes during the early stages of renal carcinogenesis, we performed immunohistochemical analysis of tubular cells in male F344 rats treated with carcinogenic doses of representative renal carcinogens for 28 days. For this purpose, the karyomegaly-inducing carcinogens ochratoxin A (OTA), ferric nitrilotriacetic acid, and monuron, and the non-karyomegaly-inducing carcinogens tris(2-chloroethyl) phosphate and potassium bromate were examined. For comparison, a karyomegaly-inducing non-carcinogen, p-nitrobenzoic acid, and a non-carcinogenic non-karyomegaly-inducing renal toxicant, acetaminophen, were also examined. The outer stripe of the outer medulla (OSOM) and the cortex + OSOM were subjected to morphometric analysis of immunoreactive proximal tubular cells. Renal carcinogens, irrespective of their karyomegaly-inducing potential, increased proximal tubular cell proliferation accompanied by an increase in topoisomerase IIα−immunoreactive cells, suggesting a reflection of cell proliferation. Karyomegaly-inducing carcinogens increased nuclear Cdc2-, γH2AX-, and phosphorylated Chk2-immunoreactive cells in both areas, the former two acting in response to DNA damage and the latter one suggestive of sustained G2. OTA, an OSOM-targeting carcinogen, could easily be distinguished from untreated controls and non-carcinogens by evaluation of molecules responding to DNA damage and G2/M transition in the OSOM. Thus, all renal carcinogens examined facilitated proximal tubular proliferation by repeated short-term treatment. Among these, karyomegaly-inducing carcinogens may cause DNA damage and G2 arrest in the target tubular cells.

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Abbreviations

APAP:

Acetaminophen

Fe-NTA:

Ferric nitrilotriacetic acid

KBrO3 :

Potassium bromate

MON:

Monuron

OSOM:

The outer stripe of the outer medulla

OTA:

Ochratoxin A

p-Chk2:

Phosphorylated Chk2

p-Histone H3:

Phosphorylated-Histone H3

PNBA:

p-Nitrobenzoic acid

Topo IIα:

Topoisomerase IIα

TRCP:

Tris(2-chloroethyl) phosphate

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Acknowledgments

The authors thank Mrs. Shigeko Suzuki for her technical assistance in preparing the histological specimens. This work was supported by a Grant-in-Aid for Scientific Research (B) from the Ministry of Education, Culture, Sports, Science and Technology of Japan. Eriko Taniai is a Research Fellow of the Japan Society for the Promotion of Science.

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All authors disclose that there are no conflicts of interest that could inappropriately influence the outcome of the present study.

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Correspondence to Makoto Shibutani.

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Taniai, E., Hayashi, H., Yafune, A. et al. Cellular distribution of cell cycle-related molecules in the renal tubules of rats treated with renal carcinogens for 28 days: relationship between cell cycle aberration and carcinogenesis. Arch Toxicol 86, 1453–1464 (2012). https://doi.org/10.1007/s00204-012-0829-z

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