PTP1B和ER-α36在乳腺癌转移中的作用及其临床病理学意义
[Abstract]:Breast cancer is one of the most common malignant tumors in women. Its high heterogeneity is the main reason that causes significant differences in clinical manifestations, reactivity and prognosis in breast cancer patients. In recent years, the concept of the molecular subtypes of breast cancer has played an important role in guiding clinical individualized treatment and judging prognosis. The molecular subtypes of breast cancer patients not only provide support for the individualized treatment of breast cancer, but also provide a basis for the in-depth study of the molecular mechanism of breast cancer. The characteristics of tumor invasion and metastasis are the main causes leading to the recurrence and poor prognosis of breast cancer patients. Stem cells (CSCs) may be the main source of invasion and metastasis, and this group of cells has little content in all tumor cells, but it has a unique self renewal, unlimited proliferation, multidirectional differentiation potential and the ability to reconstruct the tumor. Previous studies in our group have found that ER- alpha 36 positive breast cancer cells are positive for ALDH1 expression and have stem cell like phenotypes, suggesting ER- Alpha 36 is of great significance in breast cancer. The important mechanism of epithelial mesenchymal transition (EMT), which is closely related to tumor stem cells, is also considered to be an important cell biological event in the process of tumor metastasis. In addition, tumor cell metastasis requires the degradation of extracellular matrix, and matrix metalloproteinase (MMPs) is the degradation of extracellular matrix. The key enzymes in the matrix have been suggested that the invasion and metastasis of different subtypes of breast cancer are different. However, the molecular mechanism of the invasion and metastasis of different subtypes of breast cancer is unclear. Protein tyrosine phosphatase 1B (PTP1B) is a non transmembrane protein tyrosine irritable enzyme, which has been found in gastric cancer, colorectal cancer and prostate cancer. The high expression of cancer and other cancers is involved in the development of the tumor. In breast cancer, although PTP1B is highly expressed in the tumor, it is not clear whether it is expressed in various subtypes of breast cancer and how and how it affects the invasion and metastasis of breast cancer cells. Based on this, we first made molecular typing for 328 cases of breast cancer and detected PTP1 The expression of B in breast cancer, by knocking down or overexpressing PTP1B expression, observed whether PTP1B could affect the invasion and migration of breast cancer cells. Then, the mechanism of the effect of PTP1B on the invasion and migration of breast cancer cells was explored. Finally, the relationship between PTP1B and the molecular subtypes of breast cancer was observed and the clinical pathology of breast cancer patients was analyzed. The relationship between the parameters and the individual breast cancer subtypes can be used to guide the individual treatment of breast cancer. The main results and conclusions are as follows: 1, the identification results of the molecular subtypes of breast cancer. (1) the expression of ER, PR and HER2 protein and m RNA by cellular immunization (ICC) combined with the expression of PR and HER2 protein and m RNA, and to divide 12 normal and breast cancer cell lines into four subtypes.MCF7 And T47D is Luminal A type (ER+ and / or pr+, her2-); BT-474 and uacc-732 are luminal B type (er+ and pr+, her2+). And the expression level of Ki67 protein and its molecular typing. The four subtypes were luminala, 54 luminal B, 94 basal-like and 29 HER2 overexpressed. The total survival (overallsurvival, OS) and disease-free survival (disease-freesurvival, DFS) in different subtypes of breast cancer were significant. The difference (p0.001, p0.001). The prognosis of luminala type breast cancer patients is significantly better than any other subtype of breast cancer (p0.001).2, PTP1B is highly expressed in breast cancer and can significantly promote the invasion and migration of breast cancer cells. (1) the expression of PTP1B protein in breast cancer tissues is significantly higher than that of normal paracancerous tissue (p0.001). (2) PTP1B was significantly correlated with lymph node metastasis in breast cancer, and the lymph node metastasis of the patients with high expression was more likely to metastasize (P0.01). (3) in cell line MCF7, the invasion and migration ability of breast cancer cell lines could be significantly inhibited after the expression of low PTP1B (P0.01). (4) in cell line mda-m In b-231, overexpression of PTP1B can significantly promote the invasion and migration capacity of breast cancer cell lines (P0.01).3. PTP1B regulates the invasion and metastasis of breast cancer cells by regulating PTEN and MMPs. (1) PTP1B expression in low MCF7 cells can effectively inhibit Akt phosphorylation. This change is mainly by up regulation of PTEN eggs in the pi3k/akt upstream pathway. On the contrary, overexpression of PTP1B expression can inhibit changes in PTEN and thus promote Akt phosphorylation. (2) the expression of PTP1B in low MCF7 cells can effectively inhibit the change of mRNA and protein levels of matrix protease (MMP2 and MMP7). However, overexpression of PTP1B expression can effectively promote the expression of MMP2 and mmp7mrna and protein levels. (3) knock low or over. The expression of PTP1B had no significant effect on the expression of related dry factors in cell lines MCF7 and MDA-MB-231 (Oct4, Nanog, Sox2 and ALDH1, P0.05). In addition, the enrichment of breast cancer stem cells in MCF7 and MDA-MB-231 cells was enriched by spheroid culture, and there was no significant correlation between PTP1B expression and breast cancer stem cells. (4) low or overexpressed PTP1B was not affected. The related genes (E-cadherin, N-cadherin and vimentin, P0.05) mRNA and protein expressed.4. PTP1B was highly expressed in Luminal type breast cancer and was positively related to poor prognosis. (1) the expression of PTP1B protein in different subtypes of breast cancer tissues was expressed in the Luminal type and HER2 positive type, and the low expression of the protein in the Basal-like type was different. Subtype breast and breast cancer cell lines also showed differential expression, high expression in type Luminal and HER2 overexpressed cell lines, low expression in Basal-like type cell lines. (2) high expression of PTP1B was significantly positively correlated with patients' ER state (P0.05). (3) high expression of PTP1B was associated with poor prognosis of Luminal type breast cancer patients (P0.05, DFS), and other subtypes. There was no significant correlation between the prognosis of patients with breast cancer (P0.05).5, ER- alpha 36 in breast cancer tissue. (1) ER- alpha 36 was positively correlated with lymph node metastasis in breast cancer patients, and high expression of ER- alpha 36 indicated poor prognosis (P0.05). (2) ER- alpha 36 protein was expressed differently in different subtype breast cancer tissues, and high table in Luminal and HER2 positive types The subtype identification of the breast cancer cell lines provides a good basis for breast cancer research workers and provides a basis for the individual treatment and mechanism of breast cancer patients. At the same time, the subtypes of breast cancer molecules are significantly related to the prognosis of the patients. We should promote and improve the prognosis of the breast cancer molecules. We should promote and improve the Basal-like. Identification of the subtypes of breast cancer in order to better guide the diagnosis and treatment of patients and determine the clinical prognosis of.PTP1B in breast cancer high expression and related to LNM. The potential mechanism for promoting invasion and metastasis of breast cancer cells is mainly related to the PI3K/AKT pathway and MMPs, not CSCs and EMT dependent modulation pathway.ER- alpha 36 and lymph node metastasis of breast cancer patients The above study shows the biological characteristics of different molecular subtypes of breast cancer and the theoretical and experimental basis for elucidating the mechanism of metastasis of different molecular subtypes of breast cancer.
【学位授予单位】:第三军医大学
【学位级别】:博士
【学位授予年份】:2016
【分类号】:R737.9
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