Abstract |
The present study was designed to determine the effects of NIK-333, a synthetic acyclic retinoid, on N- diethylnitrosamine (DEN)-induced hepatocarcinogenesis in male F344 rats. Animals were given DEN dissolved in drinking water at a concentration of 40 p.p.m. for 5 weeks and then provided with drinking water free of DEN for 15 weeks to induce hepatocellular neoplasms. NIK-333 was administered orally (once a day) to rats at doses of 10, 40 and 80 mg/kg body wt for 14 weeks, starting 1 week after the completion of administration of DEN. At 20 weeks after the start of DEN administration, histopathological evaluation was carried out on all animals. The effects of NIK-333 on the cell proliferation activity of non-tumorous areas and liver tumor cells and the immunohistochemical expression of transforming growth factor-alpha ( TGF-alpha) were also evaluated. NIK-333 at 40 and 80 mg/kg body wt significantly inhibited hepatocarcinogenesis (P < 0.05). In addition, NIK-333 at the same doses decreased DEN-induced overexpression of TGF-alpha in hepatocellular neoplasms ( adenomas and carcinomas) and their surrounding tissue. Furthermore, NIK-333 significantly inhibited cell proliferation activity in the lesions and in non-tumorous areas (P < 0.01). Our results suggest that NIK-333 inhibits DEN-induced hepatocarcinogenesis through suppression of TGF-alpha expression and cell proliferation.
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Authors | Masataka Kagawa, Tetsuro Sano, Naoto Ishibashi, Manabu Hashimoto, Masataka Okuno, Hisataka Moriwaki, Rikako Suzuki, Hiroyuki Kohno, Takuji Tanaka |
Journal | Carcinogenesis
(Carcinogenesis)
Vol. 25
Issue 6
Pg. 979-85
(Jun 2004)
ISSN: 0143-3334 [Print] England |
PMID | 14742314
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Anticarcinogenic Agents
- Retinoids
- Transforming Growth Factor alpha
- (2E,4E,6E,10E)-3,7,11,15-tetramethyl-2,4,6,10,14-hexadecapentaenoic acid
- Diethylnitrosamine
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Topics |
- Animals
- Anticarcinogenic Agents
(pharmacology)
- Cell Division
(drug effects)
- Diethylnitrosamine
(toxicity)
- Dose-Response Relationship, Drug
- Immunohistochemistry
- Liver Neoplasms, Experimental
(chemically induced, metabolism, pathology, prevention & control)
- Male
- Rats
- Rats, Inbred F344
- Retinoids
(pharmacology)
- Transforming Growth Factor alpha
(antagonists & inhibitors, metabolism)
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