| Project/Area Number |
09470344
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Urology
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| Research Institution | Kanazawa University |
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Principal Investigator |
KOSHIDA Kiyoshi University Hospital, Kanazawa University Assistant Professor, 医学部・附属病院, 講師 (70186667)
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| Co-Investigator(Kenkyū-buntansha) |
HIRANO Kazuyuki Gifu drag Unversity, Professor, 薬学部, 教授 (90057365)
NAMIKI Mikio School of Medicine, Professor, 医学部, 教授 (70155985)
UCHIBAYASHI Tadao School of Medicine, Assistant Professor, 医学部, 助教授 (90151894)
YOKOYAMA Kunihiko University Hospital, Assistant Proessor, 医学部・附属病院, 講師 (60230661)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1998: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | prostate cancer / Gene therapy / Targeting radiotherapy / 標的放射線療法 |
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| Research Abstract |
Sensitivity of human prostate cancer cell lines : LNCaP, DU-145, PC-3 to 5FU in vitro was as follows ; LNCaP>DU-145>PC-3. Cytotoxic effect of 5FC to these cell lines to which cytosine deaminase gene was transfected, was shown for only LNCaP/CD, mostly depending on the efficiency of gene transfection. The order of sensitivity to 5FC was the same as that of intact cell lines to 5FU following selection of these cells with G418. Then we developed an in vivo model by injection of LNCaP or LNCaP/CD cells into the testis of SCID mice. A significant anti-tumor effect was shown by systemic administration of 15 mg/kg, 30 mg/kg of 5FU with mild weight loss. Also equivalent anti-tumor effect was shown for LNCaP/CD tumor by administration of 5FC without weight loss. The tissue and serum concentration of 5FU corresponded to the anti-tumor effect and the adverse reaction observed. This might represent the advantages of the gene therapy. Then the potential of combination with radioimmunotherapy was investigated. I-131 labeled anti-PSA Ab was injected following 5FC administration to enhance anti-tumor effect. However, no anti-tumor effect was obtained in combination of RIT and gene therapy, probably due to poor accumulation of the Ab to tumors. We need dose escalation study of I-131 labeled Ab and to improve the specificity of the Ab as well.
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