• 제목/요약/키워드: radiation response

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P53 OVEREXPRESSION AND OUTCOME OF RADIOTHERAPY IN HEAD & NECK CANCERS

  • Kim, In-Ah;Choi, Ihl-Bhong;Kang, Ki-Mun;Choi, Byung-Ok;Kim, Kyung-Mi;Park, Kyung-Shin;Cho, Seong-Ho;Kim, Hyung-Tae;Kim, Young-Shin;Kang, Chang-Suk
    • 한국생물물리학회:학술대회논문집
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    • 한국생물물리학회 1999년도 학술발표회 진행표 및 논문초록
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    • pp.70-70
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    • 1999
  • Experimental studies have implicated the wild type p53 in cellular response to radiation. Whether altered p53 function can lead to changes in clinical radiocurability remains an area of ongoing study. This study was performed to investigate whether any correlation between change of p53 and outcome of curative radiation therapy in patients with head and neck cancers.(omitted)

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Bacillus lentimorbus WJ5의 감마선유도 돌연변이체들에서 공통으로 발현되는 방사선 관련 유전자의 microarray 분석 (Microarray Analysis of Radiation Related Gene Expression in Mutants of Bacillus lentimorbus WJ5 Induced by Gamma Radiation)

  • 이영근;장화형;장유신;허재호;형석원;정혜영
    • 환경생물
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    • 제22권3호
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    • pp.472-477
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    • 2004
  • 본 연구에서는 감마선으로 유도된 돌연변이체들에서 공통으로 발현되는 방사선 관련 유전자들의 발현을 연구하기 위하여, B. lentimorbus WJ5 의 방사선 유도 돌연변이체에서 발현되는 유전자를 DNA microarray로 동시에 탐색하였다. DNA microarray는 B. lentimorbus WJ5 genome을 무작위로 절단하여 2,000 단편으로 구성하였으며, 감마선 $(^{60}/Co)$으로 유도된 7 돌연변이체의 발현을 정량적으로 관찰하였다. 클러스터 분석결과 발현된 408 유전자 중 27개가 감마선 유도 돌연변이체 모두에서 유의하게 발현이 증가되었다. 특히, 복구(mutL, mutM) 에너지 대사 (acsA, sdhB, pgk, yhjB, citB), protease (npr), 산화자극에 대한 환원 (HMM)관련 유전자들이 동시에 증가되었다. 이는 감마선 유도 돌연변이체들에서 자발적인 직/간접 복구 관련 유전자의 발현 증가는 방사선 노출 직후 보이는 stress response와는 다른 현상임을 나타내는 것으로 생각된다.

Treatment results of radiotherapy following CHOP or R-CHOP in limited-stage head-and-neck diffuse large B-cell lymphoma: a single institutional experience

  • Jeong, Jae-Uk;Chung, Woong-Ki;Nam, Taek-Keun;Yang, Deok-Hwan;Ahn, Sung-Ja;Song, Ju-Young;Yoon, Mee Sun;Kim, Yong-Hyeob
    • Radiation Oncology Journal
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    • 제35권4호
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    • pp.317-324
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    • 2017
  • Purpose: This study evaluated outcomes of radiotherapy (RT) after chemotherapy in limited-stage head-and-neck diffuse large B-cell lymphoma (DLBCL). Materials and Methods: Eighty patients who were treated for limited-stage head-and-neck DLBCL with CHOP (n = 43) or R-CHOP (n = 37), were analyzed. After chemotherapy, RT was administered to the extended field (n = 60) or the involved field (n = 16), or the involved site (n = 4). The median dose of RT ranged from 36 Gy in case of those with a complete response, to 45-60 Gy in those with a partial response. Results: In all patients, the 5-year overall survival (OS) and disease-free survival (DFS) rates were 83.9% and 80.1%, respectively. In comparison with the CHOP regimen, the R-CHOP regimen showed a better 5-year DFS (86.5% vs. 73.9%, p = 0.027) and a lower rate of treatment failures (25.6% vs. 8.1%, p = 0.040). The volume (p = 0.047) and dose of RT (p < 0.001) were significantly reduced in patients treated with R-CHOP compared to that in those treated with CHOP. Conclusion: The outcomes of RT after chemotherapy with R-CHOP were better than those of CHOP regimen for limited-stage head-and-neck DLBCL. In patients treated with R-CHOP, a reduced RT dose and volume might be feasible without increasing treatment failures.

Low-dose of Ultraviolet radiation-, Ethyl methanesulfonateor Bleomycin-lnduced Adaptive Response in Chinese hamster ovary Cells

  • Lee, Dong-Wook;Shin, Eun-Joo;Um, Kyung-Il
    • 한국환경성돌연변이발암원학회지
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    • 제15권2호
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    • pp.94-99
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    • 1995
  • The adaptive response and cross-adaptive response to sister chromatid exchanges (SCEs) and DNA single-strand breaks (SSBs) in Chinese hamster ovary (CHO)-K$_1$ cells treated with ultraviolet radiation (UV), ethyl methanesuffonate (EMS), or bleomycin (BLM) were investigated. Two assays were used in this study; SCEs and alkaline elution. The pretreatment with low conditioning dose of 2 mM EMS or 1 J/m$^2$ UV decreased the yield of SCEs induced by subsequent treatment with 8 mM EMS, 5 J/m$^2$ UV or 5 $\mu$g/ml BLM. And the pretreatment with low conditioning dose of 1 $\mu$g/ml BLM decreased the yield of SCEs induced by subsequent treatment with 5 $\mu$g/ml BLM or 5 J/m$^2$ UV. The rejoining of DNA SSBs in cells subsequently treated with 2 J/m$^2$ UV, 50 mM EMS or 400 $\mu$g/ml BLM is higher than that only treated with 2 J/m$^2$ UV, 50 mM EMS or 400 $\mu$g/ml BLM. These results suggest that there are the adaptive response and cross-adaptive response to SCEs, and is the adaptive response to the rejoining of DNA SSBs in CHO cells.

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Overexpression of Rb and E2F-1 in Ataxia-Telangiectasia Lymphocytes

  • Varghese, Susan;Jung, Mi-Ra
    • Archives of Pharmacal Research
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    • 제21권6호
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    • pp.640-644
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    • 1998
  • AT cells exhibit defective cell cycle regulation following DNA damage. Previous studies have shown that induction of p53 and p2i proteins are delayed in response to ionizing rad iation, resulting in the failure of G1/S checkpoint in AT cells. In this study, further investigation of the molecular mechanisms underlying G1/S phase progression in AT cells was conducted. Exponentially growing normal and AT cells were exposed to 2 Gly of ionizing radiation and the expression levels and functional activities of Rb and E2F-1 proteins were determined. We observed overexpression of hyperphosphorylated Rb and E2F-1 proteins in AT cells, which was unaffected post-irradiation. Furthermore, gel shift assays showed that E2F-1-DNA binding was constitutive in AT cells, whereas it was inhibited in control cells following exposure to ionizing radiation. The data suggests that abnormalities in the function of Rb and E2F-1 proteins may also be responsible for the failure of AT cells to arrest in the G1/S checkpoint in response to DNA damage.

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Evaluation of apoptosis after ionizing radiation in feeding and starving rats

  • Lee, Jae-Hyun;Cho, Kyung-Ja;Hong, Seok-Il;Park, Min-Kyung
    • 한국수의병리학회지
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    • 제2권1호
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    • pp.37-46
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    • 1998
  • It has been known that $\gamma$-irradiation usually induces cell death in regenerating stem cell in normal tissues like skin, intestine and hematopoietic organ. The experiment were carried out to evaluate the early response of radiation injury in radiosensitive and intermediate radiosensitive tissues in feeding and starving rats with the doses of 3.5 and 7.0 Gy. The results of the study showed that the histological phenomenon was apoptosis in the doses of the radiation as the early response of tissue injury. Apoptosis were showed organ-specific and cellular specific responses suggesting that the selection of apoptosis be exactly focused on highly renewal organs and cells. It was interesting that the rats starved for 72 hours prior to irradiation induced less apoptosis in liver than fed rats. As for cellular responses it appeared that apoptotic cells were mostly distributed in ductal or periportal cells in liver of feeding rats unlikely in liver of Starving rots which showed no difference in zonal distribution. In salivary gland apoptotic cells in fed rats were highly induced in intercalating and ductal cell population than in acinar cell population although unlikely in starved rats. This study showed the value of apoptosis using the detection system of TUNEL for evaluating cellular damage after radiation injury and the diminished effect of starvation on cell damage after ionizing irradiation.

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자궁 경부암에서 방사선 단독치료와 방사선 및 화학요법 병행치료의 비교 (Comparison of the Result of Radiation Alone and Chemoradiation in Cervical Cancer)

  • 김재철;박인규
    • Radiation Oncology Journal
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    • 제13권2호
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    • pp.191-198
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    • 1995
  • 목적: 자궁경부암의 치료에 있어 방사선 단독치료와 비교하여 방사선 및 화학요법 병행치료가 치료에 대한 반응, 생존율, 재발양상, 원격전이 및 부작용의 빈도 등에 영향를 주는가를 보고자 하였다. 방법: 경북대학교병원 치료방사선과에서 1985년 11월부터 1991년 12월까지 자궁경부암으로 근치적 방사선치료를 받은 135명의 환자를 대상으로 치료에 대한 반응, 생존율, 재발양상, 원격전이 및 부작용의 빈도에 대하여 후향적 분석을 하였다. 방사선 단독으로 치료한 환자는 56명이었고, cisplatin을 포함한 화학요법을 병행한 환자는 79명이었다. 대상 환자들의 추적조사기간은 5개월에서 105개월이었다(중간값: 47개월). FIGO 병기별 분류에 의하면, IB가 18명$(13.3\%),$ IIA가 7명 $(5.2\%),$ IIB가 97명 $(71.9\%),$ IIIB가 9명 $(6.7\%)E이었다. 결과: 방사선 단독치료군 중 51예 $(91.1\%),$ 병행치료군 중 68예 $(86.1\%)$에서 완전관해가 관찰되었다. 전체 환자의 5년생존율은 $73.3\%$였고, 병기별 5년생존율은 IB가 $88.9\%,$ IIA가 $85.7\%,$ IIB가 $73.8\%,$ IIIB가 $37.5\%$였다. 치료방법에 따른 5년생존율은 방사선 단독치료군에서 $81.9\%$였고, 병행치료군에서 $67.0\%$였다(p=0.22). 5년무병생존율은 방사선 단독치료군에서 $70.4\%$였고, 병행치료군에서 $68.5\%$였다 (p=0.85). 5년국소제어율은 방사선 단독치료군에서 $76.1\%$였고, 병행치료군에서 $73.8\%$였다(p=0.70). 5년원격제어율은 방사선 단독치료군에서 $83.9\%$였고, 병행치료군에서 $90.3\%$였다(p=0.59). 치료에 따른 골수억제는 방사선 단독치료군에서 3예 $(5.4\%),$ 병행치료관에서 14예 $(17.7\%)$가 관찰되었다(p<0.05). 내과적 치료로 호전되었던 방광염이 방사선 단독치료군에서 14예, 병행치료군에서 10예 관찰되었다. 내과적 치료로 호전되었던 직장염이 방사선 단독치료군에서 2예, 병행치료군에서 4예 관찰되었고, 외과적 치료를 요했던 직장천공이 병행치료군에서 1예 관찰되었다. 보존적 치료로 해결되었던 장폐쇄의 부작용은 방사선 단독치료군에서만 2예 관찰되었다. 양 군간의 방광염, 직장염, 소장폐쇄의 빈도에는 유의한 차이가 없었다. 결론: 방사선 단독치료군과 비교할 때 cisplatin을 포함한 화학요법의 병행은 치료에 대한 반응, 생존율, 재발양상, 원격전이에 영향을 미치지 않았고, 병행치료군에서 골수억제의 빈도가 더 높게 나타났다.

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Possible Biomarker Gene for Radiation Workers in Hospital

  • Jin, Young-Woo;Jeong, Mee-Seon;Moon, Kien;Lee, Chee-Young;Bae, Sang-Woo;Choi, Soo-Yong;Lee, Yun-Sil
    • Molecular & Cellular Toxicology
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    • 제5권2호
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    • pp.165-171
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    • 2009
  • Biomarkers indicating past exposure to radiation have not yet been entirely satisfactory. In this study, we validated several genes reported as radiation response genes, as biomarkers to detect past exposure to radiation in occupationally exposed workers, especially workers in the medical field. A total of 54 radiation workers in hospital were investigated for radiation exposure dose. Their average radiation dose of recent one year was 1.09 mSv ($\pm$1.63) with a 10.63 mSv ($\pm$12.91) cumulative dose. The results of the multiple regression analysis for the various variables indicate that the Hsc70 (P=0.0292) and ORAL (P=0.0045) may be candidate biomarkers for the recent 1 year radiation exposure in radiation workers, whereas AEN (P=0.0334) and PGAMI (P=0.0003) might be for cumulative exposure.

Granulocytic Sarcoma : 방사선 치료 성적 (Granulocytic Sarcoma: Results of Radiotherapy)

  • 송미희;정은지;성진실;서창옥
    • Radiation Oncology Journal
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    • 제10권2호
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    • pp.261-266
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    • 1992
  • 1987년 3월부터 1992년 3월까지 연세의료원 암쎈터 치료방사선과에서 방사선치료를 받은 Granulocytic sarcoma 환자를 대상으로 이들의 치료성적과 방사선 선량반응 관계를 알아보기 위해 후향성 분석을 하였다. 14예의 Granulocytic sarcoma 병변이 9예의 환자에서 발생하였고 급성, 만성 골수구성 백혈병 또는 무백헐병 상태 등과 같은 다양한 임상적 시기에 발생하였다. 병소부위는 내림 순으로 골, 임파절, 연부 조직과 피부이었다. 모든 14예의 병변은 외부 방사선(Co-60 또는 전자선)으로 치료 받았고 대다수의 병변이 2000 cGy 이상의 전 방사선 선량으로 국소 방사선 치료를 받았다. 연령 분포와 발생한 임상시기는 치료에 대한 반응과 관련이 없는 것으로 나타났다. 골에서 발생한 임상시기는 치료에 대한 반응과 관련이 없는 것으로 나타났다. 골에서 발생한 병변은 다른 부위에서 발생한 병변에 비해 치료에 대한 반응이 더 좋은 것 같았다. 2000 cGy이상의 방사선 선량을 받은 병변은 $100\%$ (l1/11)의 월등한 국소 제어율을 보였지만 2000 cGy이하의 방사선 선량을 받은 병변은 $33\%$ (1/3)의 감소된 국소 제어율을 보였다. 결론적으로 국소 방사선 치료는 Granulocytic sarcoma의 완화 또는 완치 목적의 치료에 있어 효과적이면 이때 2000 cGy이상의 방사선 선량이 필요한 것으로 생각된다.

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