結(jié)內(nèi)濾泡性淋巴瘤的新標(biāo)識—原鈣粘蛋白γA3
[Abstract]:Follicular lymphoma (FL) is a common inert B-cell lymphoma, accounting for 70% of inert lymphoma. 80% to 90% of follicular lymphoma cases have heterotopic chromosomes 14 and 18, resulting in positive expression of BCL-2 in these cases, but the remaining 10% to 20% of cases due to lack of t (14; 18) (q32; q21) but not expression of BCL-2. It is still difficult to diagnose follicular lymphoma with negative expression of-2 even if the expression of other markers is detected by immunochemical staining. Therefore, it is difficult to find a diagnostic marker for follicular lymphoma with high expression in all grades of follicular lymphoma and high expression in BCL-2 negative samples for follicular lymphoma. The purpose of this study is to identify the differentially expressed genes in intranodal follicular lymphoma (IFL) and reactive follicular hyperplasia (RFH) by gene chip, and to study their functions in order to find a novel FL diagnostic marker and explore the possible molecular mechanism of FL. Methods: (1) The genes differentially expressed between intranodal follicular lymphoma and reactive follicular hyperplasia were identified by gene chip analysis, and the most distinct genes were screened out. PCDHGA3 was selected as the research object by considering the limitation of antibody products. The expression of PCDHGA3 in different grades of intranodal follicular lymphoma and reactive follicular hyperplasia was detected by histochemical staining, and statistical analysis was carried out to explore whether PCDHGA3 could be used as a diagnostic marker of intranodal follicular lymphoma. (3) The expression of PCDHGA3 in intranodal follicular lymphoma cell lines was detected by RT-PCR. SiRNA was used to down-regulate the expression of PCDHGA3, and the effect of PCDHGA3 on cell proliferation was studied. The expression of genes related to NF-kappa B signaling pathway was detected by real-time quantitative PCR to explore the possible molecular mechanism of PCDHGA3 regulating cell proliferation. Results (1) Gene chip analysis showed that 13 members of the procadherin gamma family (procadherin gamma A2, A3, A5, A7, A8, A9, A12, B1, B3, B4, B6 and B7) were highly expressed in intranodal follicular lymphoma. (2) Immunohistochemical staining showed that the expression of procadherin gamma A3 in primary intranodal follicular lymphoma was 93.1% (27/29), that in grade 2 intranodal follicular lymphoma was 83.3% (5/6), and that in grade 3 intranodal follicular lymphoma was 55.6%. (5/9). At the same time, the expression rate was 100% (10/10) in the diffuse region of intranodal follicular lymphoma, but only 5.9% (1/17) in reactive follicular hyperplasia, and the expression of pro-cadherin gamma A3 was still high in BCL-2 negative intranodal follicular lymphoma (86.7%, 13/15). (3) PCR results confirmed that pro-cadherin gamma A3 was in follicular lymphoma. Both F18 and F318 were expressed in lymphoma cell lines. PCDHGA3 Si RNA was transfected into FL18 cells by electrotransfection. Real-time quantitative PCR and Western blot results showed that PCDHGA3 Si RNA 3 could down-regulate the expression of procadherin gamma A3 by 60% (p = 0.005). Cell counts showed that FL18 cells were down-regulated by down-regulating the expression of procadherin gamma A3. The proliferation of FL18 cells transfected with PCDHGA3si RNA 3 was significantly slower than that of untransfected cells (26 Proliferation of follicular lymphoma cells. By analyzing the differentially expressed gene data in intranodal follicular lymphoma and reactive follicular hyperplasia, five genes with the greatest positive correlation with the expression of PCDHGA3 gene were identified, namely OPRL1, TNFRSF6B, ADAMTSL5, ACCSL and CHST4, in which TNFRSF6B and PCDHGA3 proteins were FL. Conclusion (1) Compared with reactive follicular hyperplasia, PCDHGA3 was overexpressed in all grades of intranodal follicular lymphoma, and BCL-2 was negative. PCDHGA3 was also highly expressed in FL patients. Therefore, PCDHGA3 was a potential diagnostic marker for intranodal follicular lymphoma. (3) After PCDHGA3 gene silencing, FL18 cells proliferated slowly, and the expression levels of classical NF-kappa B signaling pathway related genes RELA, NFKB1 and NFKB2 were down-regulated. (4) The expression of TNFRSF6B protein in intranodal follicular lymphoma is related to PCDHGA3, suggesting that PCDHGA3 may regulate FL18 cell proliferation through TNFRSF6B.
【學(xué)位授予單位】:吉林大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2016
【分類號】:R733.1
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