Over-representation of specific regions of chromosome 22 in cells from human glioma correlate with resistance to 1,3-bis(2-chloroethyl)-1-nitrosourea
<p>Abstract</p> <p>Background</p> <p>Glioblastoma multiforme is the most malignant form of brain tumor. Despite treatment including surgical resection, adjuvant chemotherapy, and radiation, these tumors typically recur. The recurrent tumor is often resistant to further...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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BMC
2006-01-01
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| Series: | BMC Cancer |
| Online Access: | http://www.biomedcentral.com/1471-2407/6/2 |
| _version_ | 1818936303557804032 |
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| author | Scheck Adrienne C Shapiro Joan Hank Nicole C |
| author_facet | Scheck Adrienne C Shapiro Joan Hank Nicole C |
| author_sort | Scheck Adrienne C |
| collection | DOAJ |
| description | <p>Abstract</p> <p>Background</p> <p>Glioblastoma multiforme is the most malignant form of brain tumor. Despite treatment including surgical resection, adjuvant chemotherapy, and radiation, these tumors typically recur. The recurrent tumor is often resistant to further therapy with the same agent, suggesting that the surviving cells that repopulate the tumor mass have an intrinsic genetic advantage. We previously demonstrated that cells selected for resistance to 1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU) are near-diploid, with over-representation of part or all of chromosomes 7 and 22. While cells from untreated gliomas often have over-representation of chromosome 7, chromosome 22 is typically under-represented.</p> <p>Methods</p> <p>We have analyzed cells from primary and recurrent tumors from the same patient before and after <it>in vitro </it>selection for resistance to clinically relevant doses of BCNU. Karyotypic analyses were done to demonstrate the genetic makeup of these cells, and fluorescent <it>in situ </it>hybridization analyses have defined the region(s) of chromosome 22 retained in these BCNU-resistant cells.</p> <p>Results</p> <p>Karyotypic analyses demonstrated that cells selected for BCNU resistance were near-diploid with over-representation of chromosomes 7 and 22. In cells where whole copies of chromosome 22 were not identified, numerous fragments of this chromosome were retained and inserted into several marker and derivative chromosomes. Fluorescent <it>in situ </it>hybridization analyses using whole chromosome paints confirmed this finding. Additional FISH analysis using bacterial artificial chromosome probes spanning the length of chromosome 22 have allowed us to map the over-represented region to 22q12.3–13.32.</p> <p>Conclusion</p> <p>Cells selected for BCNU resistance either <it>in vivo </it>or <it>in vitro </it>retain sequences mapped to chromosome 22. The specific over-representation of sequences mapped to 22q12.3–13.32 suggest the presence of a DNA sequence important to BCNU survival and/or resistance located in this region of chromosome 22.</p> |
| first_indexed | 2024-12-20T05:33:55Z |
| format | Article |
| id | doaj.art-b342fe98afd64bc3a59eaab8b0609efb |
| institution | Directory Open Access Journal |
| issn | 1471-2407 |
| language | English |
| last_indexed | 2024-12-20T05:33:55Z |
| publishDate | 2006-01-01 |
| publisher | BMC |
| record_format | Article |
| series | BMC Cancer |
| spelling | doaj.art-b342fe98afd64bc3a59eaab8b0609efb2022-12-21T19:51:41ZengBMCBMC Cancer1471-24072006-01-0161210.1186/1471-2407-6-2Over-representation of specific regions of chromosome 22 in cells from human glioma correlate with resistance to 1,3-bis(2-chloroethyl)-1-nitrosoureaScheck Adrienne CShapiro JoanHank Nicole C<p>Abstract</p> <p>Background</p> <p>Glioblastoma multiforme is the most malignant form of brain tumor. Despite treatment including surgical resection, adjuvant chemotherapy, and radiation, these tumors typically recur. The recurrent tumor is often resistant to further therapy with the same agent, suggesting that the surviving cells that repopulate the tumor mass have an intrinsic genetic advantage. We previously demonstrated that cells selected for resistance to 1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU) are near-diploid, with over-representation of part or all of chromosomes 7 and 22. While cells from untreated gliomas often have over-representation of chromosome 7, chromosome 22 is typically under-represented.</p> <p>Methods</p> <p>We have analyzed cells from primary and recurrent tumors from the same patient before and after <it>in vitro </it>selection for resistance to clinically relevant doses of BCNU. Karyotypic analyses were done to demonstrate the genetic makeup of these cells, and fluorescent <it>in situ </it>hybridization analyses have defined the region(s) of chromosome 22 retained in these BCNU-resistant cells.</p> <p>Results</p> <p>Karyotypic analyses demonstrated that cells selected for BCNU resistance were near-diploid with over-representation of chromosomes 7 and 22. In cells where whole copies of chromosome 22 were not identified, numerous fragments of this chromosome were retained and inserted into several marker and derivative chromosomes. Fluorescent <it>in situ </it>hybridization analyses using whole chromosome paints confirmed this finding. Additional FISH analysis using bacterial artificial chromosome probes spanning the length of chromosome 22 have allowed us to map the over-represented region to 22q12.3–13.32.</p> <p>Conclusion</p> <p>Cells selected for BCNU resistance either <it>in vivo </it>or <it>in vitro </it>retain sequences mapped to chromosome 22. The specific over-representation of sequences mapped to 22q12.3–13.32 suggest the presence of a DNA sequence important to BCNU survival and/or resistance located in this region of chromosome 22.</p>http://www.biomedcentral.com/1471-2407/6/2 |
| spellingShingle | Scheck Adrienne C Shapiro Joan Hank Nicole C Over-representation of specific regions of chromosome 22 in cells from human glioma correlate with resistance to 1,3-bis(2-chloroethyl)-1-nitrosourea BMC Cancer |
| title | Over-representation of specific regions of chromosome 22 in cells from human glioma correlate with resistance to 1,3-bis(2-chloroethyl)-1-nitrosourea |
| title_full | Over-representation of specific regions of chromosome 22 in cells from human glioma correlate with resistance to 1,3-bis(2-chloroethyl)-1-nitrosourea |
| title_fullStr | Over-representation of specific regions of chromosome 22 in cells from human glioma correlate with resistance to 1,3-bis(2-chloroethyl)-1-nitrosourea |
| title_full_unstemmed | Over-representation of specific regions of chromosome 22 in cells from human glioma correlate with resistance to 1,3-bis(2-chloroethyl)-1-nitrosourea |
| title_short | Over-representation of specific regions of chromosome 22 in cells from human glioma correlate with resistance to 1,3-bis(2-chloroethyl)-1-nitrosourea |
| title_sort | over representation of specific regions of chromosome 22 in cells from human glioma correlate with resistance to 1 3 bis 2 chloroethyl 1 nitrosourea |
| url | http://www.biomedcentral.com/1471-2407/6/2 |
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