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- Radiotherapy Response in Microsatellite Instability Related Rectal Cancer
- Joo-Shik Shin, Thein Ga Tut, Tao Yang, C. Soon Lee
- Korean J Pathol. 2013;47(1):1-8. Published online February 25, 2013
- DOI: https://doi.org/10.4132/KoreanJPathol.2013.47.1.1
- 9,910 View
- 95 Download
- 27 Crossref
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Abstract
PDF Preoperative radiotherapy may improve the resectability and subsequent local control of rectal cancers. However, the extent of radiation induced regression in these tumours varies widely between individuals. To date no reliable predictive marker of radiation sensitivity in rectal cancer has been identified. At the cellular level, radiation injury initiates a complex molecular network of DNA damage response (DDR) pathways that leads to cell cycle arrest, attempts at re-constituting the damaged DNA and should this fail, then apoptosis. This review presents the details which suggest the roles of DNA mismatch repair proteins, the lack of which define a distinct subset of colorectal cancers with microsatellite instability (MSI), in the DDR pathways. Hence routine assessment of the MSI status in rectal cancers may potentially serve as a predictor of radiotherapy response, thereby improving patient stratification in the administration of this otherwise toxic treatment.
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Citations
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- Potential risks associated with the use of ionizing radiation for imaging and treatment of colorectal cancer in Lynch syndrome patients
Original Articles
- The Role of gadd and p53 Genes in Apoptosis and Cell Cycle Delay by Genotoxic Agents.
- Jung Young Lee, Jung Duk Lee, Seung Myung Dong, Eun Young Na, Min Sun Shin, Su Young Kim, Sug Hyung Lee, Won Sang Park, Nam Jin Yoo
- Korean J Pathol. 1998;32(4):239-247.
- 1,832 View
- 28 Download
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Abstract
PDF
- The aim of this study was to investigate the relationships between the gadd genes expression and an apoptosis induction in two different growing cell types after treatments with cisplatin and methylmethan sulfonate (MMS). We have examined the kinetics and specificity of gadd45 and gadd153 expression following cisplatin and MMS treatments to HL-60 cells and primary cultured human kidney (HKN) cells. We have also determined an induction time of apoptosis by DNA fragmentation analysis and the presence of the cell cycle arrest by a flow cytometric measurement. The results were as follows. In non-adherent HL-60 cells, a typical ladder pattern was observed within 4 hours after treatments of 20 micrometer of cisplatin and 100 microgram/ml of MMS. At the same time while adherent HKN cells failed to exhibit a ladder pattern at even higher doses of genotoxic agents. Since HL-60 cells do not have p53 gene, these findings suggest the presence of a p53-independent apoptotic pathway. The increasing patterns of the mRNA levels of gadd45 and gadd153 varied with the type of genotoxic agents. In the case of MMS treatment, the induction was rapid and transient, regardless of the cell types. The mRNA level peaked at 4 hours after MMS treatment and markedly decreased after 12 hours. On the other hand, cisplatin-induced transcriptions of gadd45 and gadd153 continued to increase for at least 24 hours and reached a peak level at 48 hours after cisplatin treatment, regardless of the cell types. HL-60 cells revealed G2 arrest following 24 hours after cisplatin and MMS treatments. These findings suggest that the regulation mechanism of apoptosis between adherent and non-adherent cells, might be different and that gadd45 and gadd153 might have an important role in DNA repair rather than apoptosis. Also, the findings suggest that an expression pattern of gadd45 and gadd153 might be different according to the type of genotoxic agents.
- Identification of Differentially Expressed Genes Using RNA Fingerprinting in Cell after DNA Damage.
- Jung Young Lee, Min Sun Shin, Seung Myung Dong, Eun Young Na, Su Young Kim, Sug Hyung Lee, Won Sang Park, Nam Jin Yoo
- Korean J Pathol. 1998;32(5):321-327.
- 1,514 View
- 10 Download
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Abstract
- RNA fingerprinting using on arbitrary primed polymerase chain reaction (RAP-PCR) was carried out to identify differentially expressed genes in HL-60 cell after treatment of methylmethane sulfonate (MMS). Twenty differentially expressed PCR products were cloned and analyzed. We have successfully obtained eight partial cDNA sequences by TA cloning method. Among these, six cDNAs were up-regulated and two cDNAs were down-regulated after the MMS treatment. Of these six up-regulated cDNAs, 3 cDNAs were equivalent to known genes in the GenBank/EMBL databases with 98~100% homology searched by BLAST program: genomic DNA fragment containing CpGg island (clone 26h8), Human Rev interacting protein-1 (RIP-1), and human zinc finger protein-4 (HZF4). The sequences of the three remaining cDNA were entirely new genes, but we didn't try to identify a full cDNA sequence. Two clones called KIAA0060 and KIAA0065, were down-regulated in HL-60 cells after the MMS treatment. These findings suggest that the RNA fingerprinting method using RAP-PCR is an effective method which can identify and separate the differentially expressed cDNAs and that the isolated cDNAs might involve in regulation mechanism of apoptosis and/or cell cycle delay, especially a p53-independent pathway, in the cells after DNA damage. But the nature of cDNAs that we have isolated remains to be elucidated.
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