Esophageal squamous cell carcinoma (ESCC), a common gastrointestinal tumor, is listed as the sixth leading cause of cancer-related death worldwide, with high morbidity and mortality as its important characteristics. In recent years, despite advances in diagnosis and treatment of ESCC, the mortality rate of ESCC is still very high, with an average overall 5-year survival rate of about 10% ∼ 41%.As with many other solid tumors, development and progression of ESCC are also considered gene regulatory disorders caused by oncogene activation and inactivation accumulation and disorders of tumor suppressor genes (TSG). Therefore, screening and exploring the key gene proteins for the occurrence, development, treatment and clinical prognosis of ESCC is an important topic in the field of ESCC research at present.
Reverse transcription-polymerase chain reaction (RT-PCR) and immunohistochemical (IHC) staining were employed to determine IBSP expression at the mRNA and protein levels in clinical ESCC samples. Moreover, functional studies were adopted to study the tumor-promoter function of IBSP.
IBSP up-regulation was found in 21 of 45 (46.7%) primary ESCC cells at mRNA level by transcription-polymerase chain reaction (RT-PCR). In addition, IHC staining further demonstrated that IBSP was up-regulated in ESCC cases and up-regulation of IBSP protein was significantly relevant to lymph node metastasis (P = 0.017), clinicopathologic stage (P = 0.001) and poor disease survival (P = 0.000) of ESCC patients. Moreover, functional studies illustrated that IBSP gene can promote the ability of proliferation and metastasis of ESCC cells. Furthermore, it was found that IBSP can regulate the EMT process by regulating MMP2 gene and N-cadherin, which promotes the metastasis of tumor cells.
the results of this study showed that IBSP up-regulation was often found in ESCC tumor specimens, indicating poor prognosis of ESCC patients. Moreover, it also demonstrated that IBSP could improve the ability of ESCC cell proliferation and tumor metastasis, which may be a valuable prognostic indicator in ESCC patients. Yet, the mechanism by which IBSP promotes tumorigenesis and development needs more researches.
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The author has declared no conflicts of interest.