软脂酸对人脐静脉血内皮祖细胞增殖、凋亡及Bcl-2表达的影响

目的探讨软脂酸（PA）对人脐静脉血内皮祖细胞（EPC）增殖、凋亡及Bcl-2表达的影响。方法密度梯度离心法获取人脐静脉血单个核细胞,培养7d后,收集贴壁细胞并加入不同浓度软脂酸（分别为200mmol/L、400mmol/L、600mmol/L）干预48h。MTT法检测PA对EPC增殖能力的影响;流式细胞仪检测PA对细胞凋亡率的影响;提取细胞RNA,采用逆转录一聚台酶链式反应（RT-PCR）技术检测Bcl-2mRNA表达;采用免疫组织化学法检测Bcl-2蛋白表达水平。结果PA呈浓度依赖性抑制EPC增殖,诱导EPC凋亡（P〈0.05或P〈0.01）;基础状态下EPC表达Bcl-2mRNA及蛋白,PA处理能抑制其表达,并存在量效关系（P〈0.05或P〈0.01）。结论PA通过下调Bcl-2表达诱导EPC凋亡、抑制EPC增殖,这可能影响血管内皮的修复及新生血管的形成。     

甘木通乙酸乙酯提取物对低糖缺氧诱导的神经细胞的保护作用

目的研究甘木通乙酸乙酯提取物对低糖缺氧诱导神经细胞凋亡的保护作用。方法 PC12细胞结合物理缺氧方式建立缺血性中风的细胞模型,CCK-8检测细胞活性,测定乳酸脱氢酶(LDH)漏出分析细胞膜完整性,流式细胞术和Hoechst 33258染色检测细胞凋亡,JC-1法测定细胞内线粒体膜电位,Western blot检测凋亡相关蛋白Bcl-2、Bax、cleaved caspase-3蛋白表达,检测SOD、MDA水平分析甘木通乙酸乙酯提取物的抗氧化能力。结果与模型组比较,甘木通乙酸乙酯提取物可以有效提高缺氧PC12细胞的存活率(P<0.01),降低LDH漏出量(P<0.01),提高线粒体膜电位,增加细胞内SOD水平,降低MDA水平,增加Bcl-2蛋白表达,减少Bax,cleaved caspase-3蛋白的表达(P<0.05,P<0.01),降低细胞凋亡率。结论甘木通乙酸乙酯提取物可抑制低糖缺氧诱导PC12细胞凋亡,该神经保护作用可能与细胞的线粒体凋亡途径有关。     

淋巴细胞凋亡异常在AITP患儿中的作用研究

目的 探讨急性特发性血小板减少性紫癜（AITP）患儿外周血淋巴细胞凋亡情况及凋亡蛋白Bcl-2和Bax蛋白表达情况.方法 采AITP患儿外周血,分离淋巴细胞,用原位细胞凋亡方法检测淋巴细胞凋亡率,用免疫组化法检测淋巴细胞Bcl-2及Bax蛋白表达率.结果 AITP患儿治疗前可见少量凋亡淋巴细胞,正常对照组未见明显凋亡细胞,Bcl-2蛋白表达率较正常对照组明显升高,Bax蛋白表达率较正常对照组降低.结论 淋巴细胞凋亡异常在AITP发病机制中起重要作用.     

乳香诱导急性非淋巴细胞白血病细胞凋亡中对Bcl-2基因调节

研究乳香诱导急性非淋巴细胞白血病细胞凋亡中对Bcl-2基因蛋白的影响。采用DNA片段百分率及免疫组化法检测30例急性非淋巴细胞白血病细胞及白血病细胞株HL60细胞经100μg/ml乳香处理前、后Bcl-2基因蛋白表达水平。结果：乳香具有诱导急性非淋巴细胞白血病细胞及HL60细胞凋亡^[1]及下调Bcl-2基因蛋白表达水平。结论：乳香具有诱导急性非淋巴细胞白血病细胞及HL60细胞凋亡作用及下调Bcl-2基因蛋白。Bcl-2基因蛋白表达水平下调可能是乳香提取物诱导急性非淋巴细胞白血病细胞凋亡重要机制之一。     

The Roles of Reelin, Bcl2, and Serotonin in Cerebellar Pathology in Autism

This review describes involvement of serotonin, Reelin, and Bcl2 in cerebellar pathology in autism. The literature regarding neurochemical, neuropathologic, and imaging aspects of autistic pathology as related to cerebellum is discussed. Where appropriate, relevant animal data are also presented to explain the impact of environmental and genetic influences on development of autism.     

Formaldehyde induces neurotoxicity to PC12 cells involving inhibition of paraoxonase-1 expression and activity

1. Formaldehyde (FA) has been found to cause toxicity to neurons. However, its neurotoxic mechanisms have not yet been clarified. Increasing evidence has shown that oxidative damage is one of the most critical effects of formaldehyde exposure. Paraoxonase-1 (PON-1) is a pivotal endogenous anti-oxidant. Thus, we hypothesized that FA-mediated downregulation of PON1 is associated with its neurotoxicity. 2. In the present work, we used PC12 cells to study the neurotoxicity of FA and explore whether PON-1 is implicated in FA-induced neurotoxicity. 3. We found that FA has potent cytotoxic and apoptotic effects on PC12 cells. FA induces an accumulation of intracellular reactive oxygen species along with downregulation of Bcl-2 expression, as well as increased cytochrome c release. FA significantly suppressed the expression and activity of PON-1 in PC12 cells. Furthermore, H(2)S, an endogenous anti-oxidant gas, antagonizes FA-induced cytotoxicity as well as 2-hydroxyquinoline, a specific inhibitor of PON-1, which also induces cytotoxicity to PC12 cells. 4. The results of the present study provide, for the first time, evidence that the inhibitory effect on PON-1 expression and activity is involved in the neurotoxicity of FA, and suggest a promising role of PON-1 as a novel therapeutic strategy for FA-mediated toxicity.     

Medulloblastomas: a correlative study of MIB-1 proliferation index along with expression of c-Myc,ERBB2, and anti-apoptotic proteins along with histological typing and clinical outcome

Background  Medulloblastoma (MB) is the most common pediatric brain tumor. It is however rare in adults. The genetic and protein expression profile of medulloblastoma is complex, which is worthwhile in terms of prognostication and development or selection of targeted therapy. Aims and objectives  The aims and objectives to correlate the MIB-1 proliferation index and protein expression profiles of c-Myc, ERBB2, and anti-apoptotic proteins (Bcl2 and Bcl-xL) in tumor cells with histological subtypes and clinical outcome. Methods and material  In 50 cases, histopathological subtyping was done, and protein expression profiling by immunohistochemical technique was performed by stains for MIB-1, Bcl2, Bcl-xL, c-Myc, and ERBB2 in 30 cases. The findings were correlated with histological types and patient’s average follow-up data. Results  Histological subtypes were similar to that described in literatures. The average expression of Bcl2, Bcl-xL, MIB-1, c-Myc, and ERBB2 were as follows: 50.38%, 38.18%, 59.03%, 46.16%, and 59.62%, respectively. Bcl2 expression showed statistically significant correlation with progress-free survival (PFS) [p = 0.046], while ERBB2 and MIB-1 showed a trend of higher expression in progressive disease. The protein expression pattern did not correlate with histological subtypes. Conclusion  Though Bcl-2, ERBB2, and MIB-1 LI came out to be potential markers of aggressive behavior, c-Myc did not correlate with PFS in MB.