| RRC ID |
44454
|
| 著者 |
Onodera A, Kawai Y, Kashimura A, Ogita F, Tsutsumi Y, Itoh N.
|
| タイトル |
Suppression of alkylating agent induced cell transformation and gastric ulceration by low-dose alkylating agent pretreatment.
|
| ジャーナル |
Biochem Biophys Res Commun
|
| Abstract |
Exposure to mild stress by chemicals and radiation causes DNA damage and leads to acquired stress resistance. Although the linear no-threshold (LNT) model of safety assessment assumes risk from any dose, evidence from radiological research demonstrates a conflicting hormetic phenomenon known as the hormesis effect. However, the mechanisms underlying radiation hormesis have not yet been clarified, and little is known about the effects of low doses of chemical carcinogens. We analyzed the efficacy of pretreatment with low doses of the alkylating agent N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) on the subsequent induction of cell transformation and gastric ulceration by high-dose MNNG. We used an in vitro Balb/3T3 A31-1-1 cell transformation test and monitored the formation of gastric ulcers in 5-week-old male ICR mice that were administered MNNG in drinking water. The treatment concentrations of MNNG were determined by the cell survival rate and past reports. For low-dose in vitro and in vivo experiments, MNNG was used at 0.028 μM, and 2.8 μg/mL, respectively. The frequency of cell transformation induced by 10 μm MNNG was decreased by low-dose MNNG pretreatment to levels similar to that of spontaneous transformation. In addition, reactive oxygen species (ROS) and mutation frequencies induced by 10 μm MNNG were decreased by low-dose MNNG pretreatment. Importantly, low-dose MNNG pretreatment had no effect on cell proliferation. In vivo studies showed that the number of gastric ulcers induced by 1 mg/mL MNNG decreased after low-dose MNNG pretreatment. These data indicate that low-dose pretreatment with carcinogens may play a beneficial role in the prevention of chemical toxicity under specified conditions.
|
| 巻・号 |
435(4)
|
| ページ |
714-9
|
| 公開日 |
2013-6-14
|
| DOI |
10.1016/j.bbrc.2013.05.049
|
| PII |
S0006-291X(13)00832-2
|
| PMID |
23702486
|
| MeSH |
Alkylating Agents / administration & dosage
Alkylating Agents / adverse effects
Animals
Dose-Response Relationship, Drug
Hormesis*
Male
Methylnitronitrosoguanidine / administration & dosage*
Methylnitronitrosoguanidine / adverse effects*
Mice
Mice, Inbred ICR
Oxidative Stress / drug effects*
Stomach Ulcer / chemically induced*
Stomach Ulcer / drug therapy*
Treatment Outcome
|
| IF |
2.985
|
| 引用数 |
2
|
|
WOS 分野
|
BIOPHYSICS
BIOCHEMISTRY & MOLECULAR BIOLOGY
|
| リソース情報 |
| ヒト・動物細胞 |
BALB/3T3 clone A31(RCB0005) |
