- Title
- Alterations in γ-actin and tubulin-targeted drug resistance in childhood leukemia
- Creator
- Verrills, Nicole M.; Po'uha, Sela T.; Liu, Marjorie L. M.; Liaw, Tracy Y. E.; Larsen, Martin R.; Ivery, Michael T.; Marshall, Glenn M.; Gunning, Peter W.; Kavallaris, Maria
- Relation
- Journal of the National Cancer Institute Vol. 98, Issue 19, p. 1363-1374
- Publisher Link
- http://dx.doi.org/10.1093/jnci/djj372
- Publisher
- Oxford University Press
- Resource Type
- journal article
- Date
- 2006
- Description
- Background: Proteomic investigations have revealed alterations in cytoskeletal proteins expressed in human acute lymphoblastic leukemia cells that are resistant to microtubule-disrupting agents. We characterized γ-actin expression in antimicrotubule drug–resistant leukemia and examined the effect of altered γ-actin in resistance of acute lymphoblastic leukemia to antimicrotubule agents. Methods: Two-dimensional polyacrylamide gel electrophoresis and mass spectrometry were used to identify actin proteins in human acute lymphoblastic leukemia cell lines resistant to vinblastine (CCRF-CEM/VLB100 cells) and desoxyepothilone B (CCRF-CEM/dEpoB140 cells). Fluorescence-based cycle sequencing was used to detect gene mutations. Site-directed mutagenesis was used to generate mutant γ-actin expression plasmids, which were used to transfect mouse NIH/3T3 cells. Clonogenic analysis was used for drug sensitivity studies. A small interfering RNA (siRNA) was used to block γ-actin gene expression in human neuroblastoma SH-EP cells. Expression of γ-actin (normalized to that of β2-microglobulin [β₂M]) in primary leukemia cells obtained from patients at diagnosis (n = 44) and relapse (n = 25) was examined using semiquantitative reverse transcription–polymerase chain reaction. Statistical significance of changes in the ratio of γ-actin to β₂M expression between diagnosis and relapse samples was determined by two-sided unpaired Student's t tests. Results: We identified novel mutant forms of γ-actin and the concomitant loss of wild-type γ-actin in CCRF-CEM/VLB100 cells and CCRF-CEM/dEpoB140 cells. Mouse NIH/3T3 cells that expressed the mutant γ-actin proteins were more resistant to antimicrotubule agents than cells transfected with empty plasmid. Human neuroblastoma SH-EP cells transfected with γ-actin siRNA displayed higher relative resistance to paclitaxel (P<.001), vinblastine (P = .04), and epothilone B (P = .045) than mock-transfected cells. No γ-actin gene mutations were identified in 37 samples of primary leukemia cells (eight from patients at diagnosis, 29 from patients at relapse). γ-Actin gene expression was lower in acute lymphoblastic leukemia samples collected at clinical relapse (n = 25; mean γ-actin/β₂M = 0.53) than in samples collected at diagnosis (n = 44; mean ��-actin/������M = 0.68; difference = 0.15, 95% confidence interval [CI] = 0.04 to 0.27, P = .01). Conclusions: These data provide functional and associative clinical evidence of a novel form of drug resistance that involves interactions between γ-actin and microtubules.
- Subject
- childhood leukemia; drug resistance
- Identifier
- uon:992
- Identifier
- http://hdl.handle.net/1959.13/26636
- Identifier
- ISSN:0027-8874
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