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Protein tyrosine phosphatases receptor type D is a potential tumour suppressor gene inactivated by deoxyribonucleic acid methylation in paediatric acute myeloid leukaemia
Author(s) -
Song Lei,
Jiang Wen,
Liu Wei,
Ji JuHua,
Shi TaiFeng,
Zhang Jie,
Xia ChunQiu
Publication year - 2016
Publication title -
acta paediatrica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 115
eISSN - 1651-2227
pISSN - 0803-5253
DOI - 10.1111/apa.13284
Subject(s) - dna methylation , cancer research , methylation , demethylating agent , downregulation and upregulation , tumor suppressor gene , microbiology and biotechnology , epigenetics , protein tyrosine phosphatase , cell growth , gene knockdown , biology , cyclin d1 , cell cycle , apoptosis , gene , gene expression , carcinogenesis , tyrosine , genetics , biochemistry
Aim Protein tyrosine phosphatases receptor type D ( PTPRD ) is a tumour suppressor gene, and its epigenetic silencing is frequently found in glioblastoma. As aberrant deoxyribonucleic acid ( DNA ) methylation patterning has been shown to play a role in leukaemogenesis, we studied the promoter methylation, expression profiles and molecular functions of PTPRD in paediatric patients with acute myeloid leukaemia ( AML ). Methods Bone marrow specimens were obtained from 32 Chinese patients with a mean age of 7.2 years (range 1.1–16.5). PTPRD and methylation status were evaluated by real‐time polymerase chain reaction ( PCR ) and methylation‐specific PCR . Western blot and flow cytometry techniques were also used. Results PTPRD expression was decreased by promoter region methylation in six AML cells and methylated in 21 (65.6%) of the 32 samples. In addition, PTPRD expression could be induced by the DNA demethylating agent 5‐aza‐2′‐deoxycytidine. Furthermore, functional studies showed that overexpression of PTPRD in AML cells inhibited cell proliferation and clonogenicity as well as inducing apoptosis. However, PTPRD knockdown increased cell proliferation. These effects were associated with downregulation of cyclin D1, c‐myc and upregulation of Bax. Conclusion The results of this study demonstrated that PTPRD was a potential tumour suppressor gene inactivated by DNA methylation in paediatric AML .