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1998 Fiscal Year Final Research Report Summary

COMPREHENSIVE ANALYSIS OF PROLIFERATIVE RESPONSES IN MURINE JEJUNAL CRYPT DURING MULTIPLE FRACTIONATION

Research Project

Project/Area Number 09670908
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Radiation science
Research InstitutionHIROSAKI UNIVERSITY

Principal Investigator

ABE Yoshinao  SCHOOL OF MEDICINE PROFESSOR, 医学部, 教授 (10167950)

Co-Investigator(Kenkyū-buntansha) MATSUTANI Hideya  SCHOOL OF MEDICINE RESEARCH ASSISTANT, 医学部, 助手 (30241483)
Project Period (FY) 1997 – 1998
KeywordsJEJUNAL CRYPT / FRACTIONATION / REPOPULATION / CELL LOSS FACTOR / APOPTOSIS / POTENTIAL DOUBLING TIME / MULTIPLE FRACTIONS A DAY / PROLIFEARTIVE RESPONSE
Research Abstract

To improve the efficacy of radiation therapy, the cause of radioresistance due to tumor repopulation during fractionation should be solved. Through these fiscal years of 1997-1998, we obtained the following experimental data regarding proliferative responses during fractionation in murine jejunal crypt. Through the experiments, fraction (fx) size was 2 Gy. 1) Clonogenic cells in the crypt were rapidly repopulating during fractionation and the extent of repopulation was dependent on fraction size a day : 2-fx-a-day treatment induced more than 1-fx-a-day treatment. 2) Number of cells in the crypt increased significantly during 2-ft-a-day treatment compared with 1-fx-a-day treatment. 3) Both treatments caused faster potential doubling time (Tpot) during fractionation and did not vary the Tpot. 4) Transition time from crypt to villi showed slower during 2-fx- a-day treatment than 1-ft-a-day treatment ; i.e. decreased cell loss factor. 5) Number of apoptosis was more increased during 2-fx-a-day treatment than 1-fx-a-day treatment.
To summarize these results, repopulation during fractionation inmurine jejunal crypt was observed and was dependent on the fraction number a day. Such proliferative responses increased the number of cells in the crypt and, thus, maintained the number of clonogenic cells in the crypt. Shortening of Tpot and decreased cell loss factor is the causes of repopulation during fractionation. These papaers are in prepare for publications.
Clinical data regarding repopulation were also reported inrelationship to such as overall treatment time, accelerated fractionation and DNA ploidy. Another clinical data suggesting importance in timing of chemotherapy during fractionations which caused an excellent results were also reported.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Y.Abe et al.: "A phase II study of cisplatin, oral administration of etoposide, OK-432 and radiation therapy for inoperable stage III non-small cell lung cancer." Int J Clin Oncol. 3. 365-369 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Mariya et al.: "The impact of biologically effective dose corrected for overall treatment time upon tumor control of stage I and II laryngeal cancers." J Jpn Soc Ther Radiol Oncol. 10. 215-222 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Mariya et al.: "Enhanced regeneration response of laryngeal and hypopharyngeal mucosa with accelerated hyperfractionated radiation therapy for glottic cancers." Radiat Med. 16. 469-472 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 真里谷靖他: "舌癌T1T2症例の226Ra組織内照射治療成績および予後測定因子としてのploidy, potential doubling timeの臨床的意義." 日本放射線腫瘍学会誌. 9. 15-24 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 場崎 潔他: "マウス小腸腺窩細胞の分裂遅延、アポトーシス高感受性細胞群生存率およびコロニー形成能をエンドポイントとした炭素線ビームのRBE." 日本放射線腫瘍学会誌. 10. 27-33 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 青木昌彦他: "頭頚部癌照射例におけるflow cytometryによる核DNA量解析." 癌の臨床. 44. 195-196 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 阿部由直他: "田中他編「癌の放射線治療」金芳堂" 「放射線治療における4(5)R」, 179-189 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 福田 寛他: "田中他編「癌の放射線治療」金芳堂" [PETによる放射線感受性予測」, 154-161 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.ABE,J.TAKAHASHI,H.FUKUDA,S.ONO,S.YOSHIOKA,T.AKAIZAWA,K.KUBOTA,K.YAMADA,T.TAKAHASHI,K.OHKUDA,N.ASOH,M.YONECHI,N.MAEHIRA,Y.MARIYA AND M.AOKI: "A PHASE II STUDY OF CISPLATIN,ORAL ADMINISTRATION OF ETOPOSIDE,OK-432 AND RADIATION THERAPY FOR INOPERABLE STAGE III NON-SMALL CELL LUNG CANCER." INTERNATIONAL JOURNAL OF CLINICAL ONCOLOGY. 3-6. 365-369 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.MARIYA,M.AOKI,A.ANBAI,H.MATSUKURA,Y.ABE,T.KIMURA,K.MATSUDA,H.OHNUMA,S.YOKOYAMA: "RESPONSE OF UNRESECTABLE PANCREATIC CANCER TO INTRAOPERATIVE RADIOTHERAPY." RADIATION MEDICINE. 16-3. 195-200 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.MARIYA,S.WATANABE,K.KATTOU,Y.ABE,M.AOKI,A.ANBAI,H.MATSUKURA,K.BASAKI,M.ABO: "THE IMPACT OF BIOLOGICALLY EFFECTIVE DOSE CORRECTED FOR OVERALL TREATMENT TIME UPON TUMOR CONTROL OF STAGE I AND II LARYNGEAL CANCERS." JOURNAL OF JAPANESE SOCIETY OF THERAPEUTIC RADIOLOGY ONCOLOGY. 10-3. 215-222 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.MARIYA,H.MATSUTANI,Y.ABE,S.NAKAJI: "ENHANCED REGENERATION RESPONSE OF LARYNGEAL AND HYPOPHARYNGEAL MUCOSA WITH ACCELERATED HYPERFRACTIONATED RADIATION THERAPY FOR GLOTTIC CANCERS." RADIATION MEDICINE. 16-6. 469-472 (1998)

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      「研究成果報告書概要(欧文)」より

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Published: 1999-12-08  

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