Dlx2在胚胎间充质细胞成骨分化中的作用

目的研究Distal-less homeobox 2(Dlx2)在胚胎间充质细胞成骨分化中的作用。方法 Bmp4诱导小鼠胚胎间充质细胞系C3H10T1/2细胞体外成骨分化。逆转录病毒转染构建过表达及基因敲除的Dlx2细胞稳定转染细胞,进行Dlx2获得性及丧失性功能研究。碱性磷酸酶活性实验检测成骨早期分化指标-碱性磷酸酶活性,实时荧光定量反转录PCR(real time reverse transcription PCR,qRT-PCR)检测成骨分化相关基因-Sp7转录因子、碱性磷酸酶和骨钙素的表达。结果结果显示过表达Dlx2明显增强胚胎间充质细胞C3H10T1/2的碱性磷酸酶活性。qRT-PCR结果显示过表达Dlx2明显促进Sp7转录因子、碱性磷酸酶和骨钙素的表达。基因敲除Dlx2明显抑制C3H10T1/2细胞的碱性磷酸酶活性,qRT-PCR结果显示基因敲除Dlx2明显抑制Sp7转录因子、碱性磷酸酶和骨钙素的表达。结论 Dlx2具有促进胚胎间充质细胞体外成骨分化的功能。

DLX2基因促进脐带干细胞成骨分化

目的研究Distal-less homeobox 2(DLX2)对脐带干细胞成骨定向分化能力的影响。方法成骨分化诱导培养基诱导脐带干细胞体外成骨分化;逆转录病毒转染构建过表达DLX2的脐带干细胞,进行DLX2获得性功能研究;碱性磷酸酶活性实验检测成骨早期分化指标—碱性磷酸酶活性;茜素红染色及钙离子定量分析检测干细胞体外矿化能力;实时荧光定量反转录PCR(real time reverse transcription PCR,qRT-PCR)检测DLX2及成骨分化相关基因-Sp7转录因子、骨涎蛋白和骨钙素的表达。结果 qRT-PCR结果显示,DLX2在牙周膜干细胞的表达明显高于非牙源性干细胞—脐带干细胞、骨髓干细胞、脂肪干细胞。碱性磷酸酶活性结果显示过表达DLX2明显增强脐带干细胞的碱性磷酸酶活性;茜素红染色及钙离子定量分析结果显示过表达DLX2明显增强脐带干细胞体外矿化能力;qRT-PCR结果显示过表达DLX2明显促进Sp7转录因子、骨涎蛋白和骨钙素的表达。结论 DLX2具有促进脐带干细胞体外成骨分化的潜能。

DLX2在结肠癌中的表达及其临床意义

目的探讨DLX2在结肠癌组织及癌旁正常组织中的表达差异及在结肠癌中的意义。方法收集96例结肠癌患者的癌组织及相应癌旁正常组织,应用免疫组织化学技术检测DLX2的表达,分析其表达与结肠癌临床病理参数的关系。结果结肠癌组织中DLX2呈阳性表达,与癌旁正常组织相比,其表达水平显著升高(P<0.01)。DLX2的表达在结肠癌的不同TNM分期、不同分化程度和是否有淋巴结转移之间,差异均有统计学意义(P<0.05)。结论 DLX2的高表达可能促进结肠癌的发生发展,深入研究其功能有可能为结肠癌的诊断治疗及预后提供新的靶标。

Increased expression of DLX2 correlates with advanced stage of gastric adenocarcinoma

AIM:To investigate the expression of distal-less homeobox 2 (DLX2) in gastric adenocarcinoma and its clinicopathological significance. METHODS:Gastric adenocarcinoma tissues were obtained from gastrectomy specimens of 129 patients from the Department of Surgery and Pathology, the Second Affiliated Hospital of Kunming Medical University. Sixty cases of normal gastric tissues were collected from gastrectomy specimens of adjacent gastric cancer margins greater than 5 cm. Patient diagnosis was established pathologically, and no patient had received chemotherapy or radiotherapy before surgery. All tissue specimens were formalin-fixed and paraffin-embedded. Immunohistochemistry was carried out to investigate the expression of DLX2 in 129 gastric adenocarcinoma tissues and 60 adjacent normal tissues. The immunos-taining reaction was semiquantitatively evaluated based on the proportion of positive cells and the median staining intensity in normal gastric epithelial cells or tumor cells. All patients had follow-up records for more than 5 years. Correlations of DLX2 expression with clinicopathological features and prognosis of patients with gastric adenocarcinoma were analyzed. All statistical analyses were performed using the SPSS 17.0 software. RESULTS:The positive expression of DLX2 was detected in 68 (52.7%) cases of 129 gastric adenocarcinoma tissues and 14 (23.3%) cases of 60 adjacent normal tissues. The difference in DLX2 expression between gastric adenocarcinoma tissues and adjacent normal tissues was statistically significant (Ⅹ2 = 14.391, P < 0.001). Moreover, high expression of DLX2 was detected in 48 (37.2%) cases of 129 human gastric cancer tissues, but not in adjacent normal tissues. The expression of DLX2 correlated with the size of tumor (P = 0.001), depth of invasion (P = 0.008), lymph node metastasis (P = 0.023) and tumor-node-metastasis stages (P = 0.020), but was not correlated with age, gender, histological differentiation and distant metastasis. The Kaplan-Meier survival analysis revealed that survival time of patients with high DLX2 expression was significantly shorter than that with low DLX2 expression. However, the multivariate analysis showed that invasion depth (P < 0.001), lymph nodes metastasis (P = 0.001) and distant metastasis (P < 0.001) were independent prognostic factors for patients with gastric adenocarcinoma, but DLX2 expression, tumor location and tumor size were not. CONCLUSION:These results suggest that increased expression of DLX2 may correlate with the advanced stage of gastric adenocarcinoma, and it may contribute to tumor development.