DPY30 knockdown suppresses colorectal carcinoma progression via inducing Raf1/MST2-mediated apoptosis

Colorectal Carcinoma (CRC) is one of the most common malignant tumors of the digestive tract, with a high mortality rate. DPY30 is one of the core subunits of the histone methyltransferase complex, which was involved in many cancer processes. However, the role of DPY30 in the occurrence and progression of CRC remains unclear. In this study, we sought to evaluate the role and mechanism of DPY30 in CRC cells apoptosis. Here, we identified that knockdown of DPY30 significantly inhibited the HT29 and HCT116 cells proliferation in vitro. Moreover, the knockdown of DPY30 significantly increased the apoptosis rate and promoted the expression of apoptosis-related proteins in CRC cells. Meanwhile, DPY30 knockdown promoted CRC cells apoptosis through endogenous programmed death and in a caspase activation-dependent manner. Furthermore, RNA-seq analysis revealed that the action of DPY30 is closely related to the apoptosis biological processes, and screened its potential effectors Raf1. Mechanistically, DPY30 downregulation promotes MST2-induced apoptosis by inhibiting Raf1 transcriptional activity through histone H3 lysine 4 trimethylation (H3K4me3). In vivo experiments showed that DPY30 was correlated with Raf1 in nude mouse subcutaneous xenografts tissues significantly. Clinical colorectal specimens further confirmed that overexpression of DPY30 in malignant tissues was significantly correlated with Raf1 level. The vital role of the DPY30/Raf1/MST2 signaling axis in the cell death and survival rate of CRC cells was disclosed, which provides potential new targets for early diagnosis and clinical treatment of CRC.

DPY30 promotes colorectal carcinoma metastasis by upregulating ZEB1 transcriptional expression

DPY30 belongs to the core subunit of components of the histone lysine methyltransferase complex, which is implicated in tumorigenesis, cell senescence, and other biological events. However, its contribution to colorectal carcinoma (CRC) progression and metastasis has yet to be elucidated. Therefore, this study aimed to investigate the biological function of DPY30 in CRC metastasis both in vitro and in vivo. Herein, our results revealed that DPY30 overexpression is significantly positively correlated with positive lymph nodes, epithelial-mesenchymal transition (EMT), and CRC metastasis. Moreover, DPY30 knockdown in HT29 and SW480 cells markedly decreased EMT progression, as well as the migratory and invasive abilities of CRC cells in vitro and lung tumor metastasis in vivo. Mechanistically, DPY30 increased histone H3K4me3 level and promoted EMT and CRC metastasis by upregulating the transcriptional expression of ZEB1. Taken together, our findings indicate that DPY30 may serve as a therapeutic target and prognostic marker for CRC.

[Clinical characteristics and prognosis in 84 patients with angioimmunoblastic T-cell lymphoma: a single-center analysis]

目的

对就诊于我院的初治血管免疫母细胞性T细胞淋巴瘤（AITL）患者进行回顾性研究，探讨AITL患者的临床特征及影响预后的因素。

方法

收集2009年7月至2018年9月就诊于福建医科大学附属协和医院，经淋巴结病理及免疫组织化学检查确诊为AITL患者的临床资料，采用Log-rank检验及Cox比例风险回归模型分析影响患者总生存（OS）期和无进展生存（PFS）期的预后因素。

结果

纳入患者84例，中位发病年龄62（39~86）岁，年龄>60岁者44例（52.4%），男60例（71.4%），男女比例2.5∶1，Ann Arbor分期Ⅲ~Ⅳ期者80例（95.2%），伴B症状者53例（63.1%）。国际预后指数（IPI）评分0~2分者25例（29.8%），3~5分者59例（70.2%）。外周T细胞淋巴瘤预后指数（PIT）评分0~1分者42例（50.0%），2~4分者42例（50.0%）。可评估疗效的61例患者中有16例（26.2%）获得完全缓解/不确定的完全缓解，25例（41.0%）获得部分缓解，总体反应率为67.2%，5年OS率和PFS率分别为46.0%和38.3%。单因素分析显示，年龄、IPI评分、PIT评分、HGB水平、是否有浆膜腔积液、是否化疗对AITL的OS有预后意义，而年龄>60岁、HGB<110 g/L及存在浆膜腔积液是影响PFS的不良因素。多因素分析显示，年龄>60岁、有浆膜腔积液是OS的独立不良预后因素。

结论

AITL是一种侵袭性高、进展快、预后差的非霍奇金淋巴瘤，初诊时多为Ⅲ~Ⅳ期。治疗前的年龄、IPI评分、PIT评分、HGB水平及是否有浆膜腔积液可作为评价预后的参考指标。