Molecular characterization of glutathione S-transferase, endothelial nitric oxide synthase and Vitamin D receptor genes in breast cancer cases | ||||
| The Egyptian Journal of Hospital Medicine | ||||
| Article 5, Volume 49, Issue 1, October 2012, Page 573-588 PDF (408.44 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejhm.2012.16199 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| Rizk El-Baz1; Azza Ismail2; Maher Amer2; Mai Elshahat3; Amira Kazamel2; Ahmad Settin1 | ||||
| 1Genetics Unit, Children Hospital, Mansoura University, Egypt | ||||
| 2Physiology Department, Faculty of Science, Mansoura University, Egypt | ||||
| 3Clinical Oncology & Radiology, Mansoura University, Egypt | ||||
| Abstract | ||||
| Background: Enzymes of the Glutathione S-transferase system (GST) modulate the effects of exposure to several cytotoxic and genotoxic agents. Nitric oxide (NO) is constitutively synthesized in the endothelium by endothelial nitric oxide synthase (eNOS) and acts as a pleiotropic regulator involved in carcinogenesis. Vitamin D levelsmay influence breast cancer development. The vitamin D receptor(VDR) is a crucial mediator for the cellular effects of vitaminD and additionally interacts with other cell-signaling pathwaysthat influence cancer development. Objectives: To check for the association of polymorphisms of GST, eNOS3 and VDR genes with the susceptibility and severity of breast cancer in Egyptian cases. Subjects: This work included 100 cases with breast cancer and 100 healthy individuals. The mean age of cases was 48.31±11.40 years. They included 100 females. Methods: DNA was amplified using PCR-RFLP for detection of polymorphisms related to eNOS3 and VDR , also DNA was amplified using PCR-SSP for detection of polymorphisms related to GST and calculating the odds ratios and their 95% confidence intervals. Results: Total cases showed high significant frequency of eNOS3-786 CC (P<0.05, OR=18.58) genotypes, GSTT1(null) (OR = 2.68; CI 95%=1.51-4.75; p=0.001). These were considered risk genotypes for disease susceptibility. On the other hand, total cases showed low significant frequency with homozygosity for eNOS3-786 TT (P=0.01) and the GSTT1 gene was present in 42.0% of the cancers and in 66.0% of controls (OR = 0.37; CI 95%= 0.21-0.66; p=0.001). These may be considered low risk genotypes. No significant difference in frequencies of null and present genotypes of GSTM1 and VDR FOKI in total cases compared to controls. Conclusions: Polymorphisms related to eNOS3-786, GSTT1 and VDR FOKI genes may be considered genetic markers for BC among Egyptian cases. This may have potential impact on family counselling as well as future management plans. | ||||
| Keywords | ||||
| BC: Breast Cancer; eNOS: Endothelial nitric oxide synthase; PCR-RFLP: polymerase chain reaction with Restriction fragment length polymorphism; PCR-SSP: polymerase chain reaction with sequence specific primers. SNP: single nucleotide | ||||
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