| Project/Area Number |
12671141
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
General surgery
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| Research Institution | CHIBA UNIVERSITY |
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Principal Investigator |
KITA Kazuko (2001) Chiba University, Graduate School of Medicine, Lecturer, 大学院・医学研究院, 講師 (80302545)
山森 秀夫 (2000) 千葉大学, 医学部, 助教授 (00166836)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAHASHL Shunji Chiba University, Graduate School of Medicine, Assistant, 大学院・医学研究院, 助手 (30311608)
NOMURA Jun Chiba University, Graduate School of Medicine, Assistant, 大学院・医学研究院, 助手 (30252886)
SUZUKI Nobuo Chiba University, Graduate School of Medicine, Professor, 大学院・医学研究院, 教授 (90111426)
喜多 和子 千葉大学, 医学部, 講師 (80302545)
高木 一也 千葉大学, 医学部, 助手 (80251164)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2001: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2000: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | PANCREATIC CANCER / K- / RAS CODON 12 / GENE MUTATION / GENE EXPRESSION / MOLECUALR CHAPERONE / HUMAN CELLS |
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| Research Abstract |
The molecular mechanisms that regulate mutability of human cells are intriguing biological problems. The present study revealed that mutability of human RS cell strain was enhanced by serum factors From pancreatic cancer patients and conditioned medium from cultures of a human pancreatic cancer cell line. RS cells, established from human fetal fibroblasts, are highly sensitive to far-rultraviolet light (UV) mutagenicity. Preculture of human RS cells with the serum factors or the medium prior to irradiation with UV resulted in an increase in the frequency of ouabain resistance (Oua^R) mutations, compared with cells irradiated but not treated with either the serum factors or the medium. Decreases in expression levels of the molecular chaperone GRP78/Bip mRNA and protein were observed in the medium-treated RSa cells. Studies using antisense oligonucleotides for GRF78/Bip mRNA showed that the antisense oligonucieotide-treated RSb cells were more susceptible to UV-induced K-ras codon 12 base substitution mutations than mock-treated cells, as determined by PCR and differential dot-blot hybridization. Thus, down-regulation of GRP78/Bip was suggested to be involved in the enhancement of mutability of human cells.
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