Tehran University Medical Journal

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Background: Breast cancer is the most common non- skin cancer among women and it’s the second leading cause of cancer related death in women. Ubiquitin and ubiquitin like proteins are member of signal transduction pathways which have several cellular functions. It has shown that Ubiquitin like protein D (UBD) has accelerated the cancer progress. The aims of this study is evaluation of UBD gene expression in women suffering from breast cancer and its correlation with disease progression. Methods: In this study 30 FFPE (Formalin-fixed, paraffin-embedded) samples 20 cases from breast cancer and 10 cases from mammoplasty were collected from Parsian and Kasra Hospitals in Tehran after confirmation by pathologist. For each sample collection characters included ER-positive, lymph node negative, tumor size less than 5 cm in diameter were considered. Samples belonged to May 2010 up to April 2012. At first paraffin was removed by adding xylene then xylene removed with replacing ethanol 98%. After removing ethanol, RNA was extracted from samples by using RNX plus solution and cDNA synthesis were performed by using Moloney murine leukemia virus (M-MuLV) enzyme. UBD gene expression were examined in all samples cDNA by relative Real Time PCR. In this study GAPDH gene expression was also used as internal control. Results: UBD gene expression was obtained by calculating ΔΔCT and RQ. The average incensement of UBD gene expression in comparison of normal samples was 11 times. The results have shown that the level of UBD expression was related to the development and extend of the disease. In patients with stage 1 of disease, UBD gene expression had 2.73 times increase (P=0.001) compared to the control samples. However in stage 4 of disease, this number has increased up to 19.4 times (P=0.0005) more than normal. Conclusion: Considering the results of this study, it could be said that UBD gene expression as useful biomarker has an important role in detection of breast cancer. In addition as UBD gene expression levels increased stages of disease increased too. So that evaluation of UBD gene expression can be useful in early detection of disease.

Keywords: breast neoplasms, gene expression, Real-time polymerase chain reaction, UBD protein

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