缺氧对海马神经元培养的影响及巴曲酶的保护作用—HSP70的表达及细胞形态学的研究

本文采用新生大鼠海马神经元培养技术，以细胞形态学及ＨＳＰ７０免疫阳性细胞表达为指标，首次观察了巴曲酶对缺氧海马神经元损伤的直接保护作用。结果发现：在缺氧前０．５ｈ给予巴曲酶（０．５ＢＵ／ｍｌ），海马神经细胞存活率以及ＨＳＰ７０免疫阳性细胞率均明显高于缺氧对照组（Ｐ＜０．０１），而在缺氧前２４ｈ给予巴曲酶后，二者与缺氧对照组均无明显差别。表明：巴曲酶对缺氧海马神经细胞损伤有直接的保护作用，而且其作用与给药的时机有关。     

Cytomegalovirus DNA can be detected in peripheral blood mononuclear cells from all seropositive and most seronegative healthy blood donors over time

BACKGROUND: A poor correlation between cytomegalovirus (CMV) seroreactivity and the risk of CMV transmission prompted an investigation of the presence of CMV DNA in peripheral blood mononuclear cells (PBMNCs) from seropositive and seronegative blood donors. Because latent CMV exists in monocytes, monocyte-enriched cells were analyzed separately. STUDY DESIGN AND METHODS: Samples from 270 blood donors were tested with a sensitive polymerase chain reaction (PCR) test that detects two CMV genes, and the results were correlated to CMV serology. Cross-reactivity with other herpesvirus genes was not recorded. RESULTS: PCR testing demonstrated that 71 percent of seropositive donors harbor CMV in PBMNCs. Thus, not all seropositive donors were CMV DNA positive when individual samples were tested. Tests repeated over a period of time showed that all seropositive individuals were positive. Increased sensitivity was obtained with enriched monocytes. Among seronegative donors, 55 percent harbored CMV DNA in monocyte-enriched PBMNCs, while 14 percent had CMV DNA in PBMNCs. CONCLUSION: All seropositive donors harbored latently infected PBMNCs, as demonstrated by the testing of samples collected over time. In addition, a substantial proportion of seronegative individuals are CMV carriers and might transfer infection. The findings concur with clinical evidence of CMV transmission by blood components from seronegative individuals and with in vitro reactivation of CMV in PBMNCs from seronegative donors.     

幽门螺杆菌相关胃黏膜疾病炎症、凋亡与乳酸杆菌的关系

幽门螺杆菌与慢性胃炎、消化性溃疡、胃癌及胃黏膜相关淋巴样组织淋巴瘤(MALT)等疾病的发生密切相关,后者是炎症发展以及凋亡-增殖失衡的渐进过程中不同阶段的表现形式．乳酸杆菌具有较好的抗H pylori的应用前景,能降低因以抗生素为主根治H pylori疗法引起的副作用,提高患者的依从性,调节菌群失调,其在H pylori诱导的胃黏膜炎症中具有抗炎作用．