冠心病不同临床类型患者血浆、血小板脂质过氧化损伤与TXA_2/PGI_2平衡的研究

作者观察98例正常人和109例不同临床类型冠心病人血浆、血小板LPO、SOD,SeGSHP_x,RBC—SOD及血浆TXB_2、6-keto-PGF_(1α)的变化,发现各型冠心病组均有LPO、PL—LPO、TxB_2、TxB_2/6-keto-PGF_(1α)比值明显升高,6-keto-PGF_(1α),SOD、PLSOD、RBC-SOD,SOD/LPO及SeGSHPX/LPO比值明显降低。但各型程度不同,以急性心肌梗塞和不稳定性心绞痛改变突出。血浆LPO与6-keto-PGF_(1α)呈显著负相关。提示脂质过氧化损伤与TXA_2/PGI_2平衡密切相关。认为SOD/LPO、SeGSHPx/LPO,TXB_2/6-keto-PGF_(1α)比值在冠心病诊断中是重要有意义的指标,血小板SOD/LPO比值能更敏感地反映冠心病人氧化与抗氧化能力的平衡状态。     

Sclerosing epithelioid fiberosarcoma: short T2 on MR imaging

A case of sclerosing epithelioid fibrosarcoma and its appearance on MRI is presented. The tumor showed a zonal architecture on MRI with a large central core of very low signal intensity and a peripheral rim of intermediate to high signal intensity on T1- and T2-weighted spin echo pulse sequences. The core showed decreased cellularity with dense collagen deposition on histologic examination, and the peripheral zone increased cellularity with increased nuclear atypia. The presence of a prominent region of very low signal intensity on T1- and T2-weighted images can be seen with neural tumors, giant cell tumor of the tendon sheath, aggressive fibromatosis, and, in rare instances, with soft tissue sarcomas rich in collagen.     

血清sIL—2r表达水平与脓毒血症的严重程度及预后的关系

目的：探讨脓毒血症患者血清中可溶性白细胞介素２受体（ｓＩＬ２ｒ）的表达水平以及与该病严重程度及预后的关系。方法：采用双抗体夹心酶联免疫分析法检测２９例脓毒血症患者血清ｓＩＬ２ｒ表达水平的动态变化，并以３０例正常人作为对照；用ＡＰＡＣＨＥⅡ评分方法对脓毒血症患者进行疾病严重度评分。结果：①脓毒血症患者血清ｓＩＬ２ｒ表达水平较正常人明显升高（Ｐ＜００１）；②脓毒血症患者中死亡者与存活者的血清ｓＩＬ２ｒ表达水平比较，感染初期及晚期死亡者明显高于存活者（Ｐ＜００５）；③以本组患者感染ｄ１的ＡＰＡＣＨＥⅡ评分的中位数１６为分界点，将患者分为２组，２组的血清ｓＩＬ２ｒ水平有显著差别（Ｐ＜００５）。结论：脓毒血症患者血清ｓＩＬ２ｒ表达水平明显升高；该指标与脓毒血症患者的疾病的严重程度及预后有密切的关系。此项指标的检测对判断脓毒血症患者的病情严重度及预后可能有重要意义     

Pharmacology of KB‐R7943: A Na+–Ca2+ exchange inhibitor

The Na⁺–Ca²⁺ exchange (NCX) system plays a pivotal role in regulating intracellular Ca²⁺ concentration in cardiomyocytes, neuronal cells, kidney and a variety of other cells. It performs a particularly important function in regulating cardiac contractility and electrical activity. One of the leading NCX inhibitors is KB‐R9743 (KBR) that appears to exhibit selectivity for Ca²⁺‐influx‐mode NCX activity (reverse mode of NCX). In this article we reviewed pharmacology of KBR and provide a brief summary of studies with other NCX inhibitors, such as SEA0400 (SEA) and SN‐6 (SN). Potential clinical usefulness of KBR and other NCX inhibitors is still controversial but the reviewed findings may be helpful in designing more selective and clinically useful NCX inhibitors for the treatment of cardiac, neuronal and kidney diseases.     

Development and proliferation of lymphocytes in mice deficient for both interleukins-2 and -4

Interleukin (IL)-2 and IL-4 are considered as important regulators of growth and differentiation of lymphocytes. We report that in mice made deficient for both IL-2 and IL-4 by gene targeting all major T cell subsets and B cells were normal, indicating that IL-2 and IL-4 are not essential for development of the immune system. Paradoxically, proliferation of T cells was increased in both IL-2- and IL-4-deficient homozygous mice.     

凋亡调控因子在凝血酶诱导海马神经元凋亡中的变化

目的探讨凝血酶（TM）对海马神经元凋亡调控凶子Bcl-2、Bax及c-jun氨基末端激酶（JNK）表达的影响，阐明TM诱导凋亡的机制。方法海马神经元经40U／mLTM作用0h、6h、12h、24h、48h、72h后终止培养，应用免疫细胞化学方法检测Bcl-2及Bax蛋白表达，Western blot检测磷酸化JNK（P—JNK）及JNK蛋白表达。结果TM作用6h后，Bcl-2蛋白表达增加，12h后开始下降，到48h达到最低值（P〈0．01），72h后Bcl-2蛋白表达开始回升。TM作用6h后，Bax蛋白表达增加，随作用时间的延长，Bax蛋白表达水平逐渐上升，到48h达到最高值（P〈0．01）。Bcl-2／Bax比值逐渐降低，在48h达最低。TM作用0h时P-JNK蛋白无表达，6h后开始表达，与0h组比较差异存在显著性（P〈0．011，12h时达高峰（P〈0．01），并持续到24h，48h后逐渐降低。0h组可见有少量JNK蛋白表达，6h后JNK蛋白表达显著增加（P〈0．01），随TM作用时间的延长，JNK蛋白表达无明显变化。结论TM可能是通过抑制Bcl-2的表达，增强Bax的表达，降低Bcl-2和Bax的比值，激活JNK信号传导通路导致海马神经元凋亡。     

肺结核患者PBMC膜白介素-2受体(CD25)表达及其临床意义

目的:探讨外周血单个核细胞(PBMC)膜白介素-2受体(CD25)表达在肺结核病鉴别诊断中的应用价值.方法:用生物素-链霉亲和素(BSA)法检测肺结核、支气管肺炎患者T细胞亚群及植物血凝素(PHA)诱导前后CD25表达水平.结果:支气管肺炎患者CD3+、CD4+、CD8+水平分别为(62.32±6.34)%、(47.52±7.16)%、(32.12±6.55)%,CD4+/CD8+ 比值为1.52±0.43,PHA诱导前后CD25水平分别为(4.56±1.52)%、(35.12±7.21)%.空洞型肺结核CD3+、CD4+、CD8+、CD4+/CD8+水平分别为(41.13±5.25)%、(43.38±5.15)%、(36.25±3.46)%和1.15±0.21,非空洞型肺结核CD3+、CD4+、CD8+、CD4+/CD8+水平分别为(46.29±5.60)%、(47.21±4.86)%、(32.36±4.03)%、1.46±0.25,相互比较CD3+、CD4+/CD8+差异均有显著性(P＜0.01和P＜0.05).空洞型肺结核与非空洞型肺结核患者PHA诱导前后CD25水平分别为(2.13±1.14)%、(27.25±3.50)%和(3.43±1.35)%、(31.14±4.11)%,两者相比差异均有显著性(P＜0.01).结论:肺结核病患者体内存在明显的细胞免疫功能紊乱,主要表现为CD25表达水平降低,CD25表达水平与肺结核病的病情似有一定关系,其对肺结核病鉴别诊断具有重要价值.     

The prevalence of LRRK2 Gly2385Arg variant in Chinese Han population with Parkinson's disease.

We conducted a case-control study to determine the prevalence of the LRRK2 Gly2385Arg variant in patients with Parkinson's disease in Han population in mainland China. Heterozygous LRRK2 Gly2385Arg variant was identified in 14 of 235 patients with Parkinson's disease (5.69%), but not in 214 unrelated healthy controls. Multivariate analysis indicated the frequency of Gly2385Arg variant in the female patients with early age at onset is higher than their male counterparts. The founder haplotype analysis showed the variant carriers shared the same founder. Clinically, the LRRK2 Gly2385Arg carriers presented with classical Parkinson's disease symptoms. Our study indicates that the LRRK2 Gly2385Arg variant is a potential ethnic-specific genetic risk factor of Parkinson's disease within Chinese Han ethnicity.     

The distribution profiles of very low density and low density lipoproteins in poorly-controlled male,Type 2 (non-insulin-dependent) diabetic patients

Summary The distribution and composition of lipoproteins spanning the very low density and low density lipoprotein spectra have been analysed in ten poorly-controlled, male, Type 2 (non-insulin-dependent), diabetic patients pre-disposed to mild, secondary hypertriglyceridaemia. As compared to age-matched control subjects, the diabetic patients displayed grossly modified, distinctly atherogenic lipoprotein profiles. Modifications were not limited to the very low density lipoprotein profile, as would be expected from the pre-treatment hypertriglyceridaemia. There was also an aberrant low density lipoprotein profile, which was not evident from plasma cholesterol measurements, especially as the diabetic patients at entry were well matched to control subjects with respect to plasma levels of this lipid. Compositional abnormalities were also observed in the poorly-controlled diabetic group, although these were less marked than the distributional changes. There were substantial improvements of the abnormalities detailed above, even over a short treatment period (two weeks), with therapy designed primarily to ameliorate metabolic control. The data suggest that, in the presence of poor metabolic control and hypertriglyceridaemia, occult, atherogenic modifications of low density lipoproteins can occur. The results argue in favour of strict control of triglyceride levels even in diabetic patients with apparently acceptable cholesterol levels.