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- Title
Activation of SNAT1/SLC38A1 in human breast cancer: correlation with p-Akt overexpression.
- Authors
Kuo Wang; Fang Cao; Wenzheng Fang; Yongwei Hu; Ying Chen; Houzhong Ding; Guanzhen Yu; Wang, Kuo; Cao, Fang; Fang, Wenzheng; Hu, Yongwei; Chen, Ying; Ding, Houzhong; Yu, Guanzhen
- Abstract
<bold>Background: </bold>SNAT1 is a subtype of the amino acid transport system A that has been implicated to play a potential role in cancer development and progression, yet its role in breast cancer remains unclear. In present study, we detected SNAT1 expression in breast cancers and explored its underlying mechanism in promoting breast carcinogenesis.<bold>Methods: </bold>RT-PCR and Western blotting were performed to analyze the transcription and protein levels of SNAT1 in breast cancer cell lines and fresh tissues. Tissue microarray blocks containing breast cancer specimens obtained from 210 patients were constructed. Expression of SNAT1 in these specimens was analyzed using immunohistochemical studies. SNAT1 was down-regulated by SNAT1-shRNA in breast cancer cells and the functional significance was measured.<bold>Results: </bold>SNAT1 was up-regulated in breast cancer cell lines and breast cancer tissues. Overexpression of SNAT1 was observed in 127 cases (60.5%). Expression of SNAT1 was significantly associated with tumor size, nodal metastasis, advanced disease stage, Ki-67, and ER status. Suppression of endogenous SNAT1 leads to cell growth inhibition, cell cycle arrest, and apoptosis of 4T1 cells and lowered the phosphorylation level of Akt. SNAT1 expression correlated significantly with p-Akt expression in human breast cancer samples.<bold>Conclusions: </bold>The cross-talk between Akt signaling and SNAT1 might play a critical role in the development and progression of breast cancer, providing an important molecular basis for novel diagnostic markers and new attractive targets in the treatment of breast cancer patients.
- Subjects
BREAST cancer treatment; PROTEIN kinase B; GENE expression; REVERSE transcriptase polymerase chain reaction; IMMUNOHISTOCHEMISTRY; DISEASE progression
- Publication
BMC Cancer, 2013, Vol 13, Issue 1, p1
- ISSN
1471-2407
- Publication type
journal article
- DOI
10.1186/1471-2407-13-343