丙戊酸钠对急性髓系白血病细胞株HL-60增殖和凋亡的影响

目的研究丙戊酸钠（VPA）对急性髓系白血病细胞株HL-60细胞的增殖抑制及诱导凋亡作用,探讨其可能作用机制。方法采用CCK-8法检测细胞生长抑制率;经瑞氏-姬姆萨（Wright—Giemsa）染色,光镜下观察经VPA处理后细胞的形态学改变;应用流式细胞仪检测细细胞周期和细胞凋亡率。结果VPA对HL-60细胞的增殖抑制作用呈时间和浓度依赖性。经2．0mmol／LVPA处理HL-60细胞48h后,显微镜下可见凋亡细胞胞体固缩、核固缩、核碎裂及凋亡小体。经1．0和2．0mmol／LVPA处理HL-160细胞48h后,流式细胞仪检查结果表明细胞凋亡率由处理前的（1．25±0．457）％分别上升为（3．27±0．984）％和（10．3±3．4）％,差并有统计学意义（P〈O．05）;G0／G1期细胞比例逐渐上升,S期细胞比例及细胞增殖指数（PI）呈下降趋势,细胞被阻滞在G0／G1期（P〈0．01）。结论VPA对HL-60细胞具有增殖抑制和诱导细胞凋亡作用。且呈剂量一时间依赖性;作用机制与细胞周期阻滞有关。     

硫酸镁对子痫前期患者血清胱抑素C和血浆血栓调节蛋白的影响

目的探讨硫酸镁对子痫前期患者血清胱抑素C(Cys C)和血浆血栓调节蛋白(TM)的影响。方法选择子痫前期患者50例为治疗组,同期住院分娩的正常孕妇30例为对照组。治疗组予25%硫酸镁4.0 g加入10%葡萄糖中静脉滴注,后以25%硫酸镁15 g加入10%葡萄糖500 ml中静脉滴注,每日1次;对照组予10%葡萄糖同等量,每日1次,静脉滴注,疗程均3d。治疗前后采用乳胶颗粒免疫比浊法测定血清Cys C的浓度,酶联免疫吸附试验方法测定血浆TM水平。结果治疗前治疗组血清Cys C和血浆TM均较对照组明显升高,差异有统计学意义(P<0.01);治疗后治疗组血清Cys C和血浆TM水平较治疗前明显下降(P<0.01),但仍然明显高于对照组(P<0.01)。结论硫酸镁可以降低子痫前期患者Cys C和TM水平,改善肾功能和内皮细胞功能。     

The nerve-heart connection in the pro-oxidant response to Mg-deficiency

Magnesium is a micronutrient essential for the normal functioning of the cardiovascular system, and Mg deficiency (MgD) is frequently associated in the clinical setting with chronic pathologies such as CHF, diabetes, hypertension, and other pathologies. Animal models of MgD have demonstrated a systemic pro-inflammatory/pro-oxidant state, involving multiple tissues/organs including neuronal, hematopoietic, cardiovascular, and gastrointestinal systems; during later stages of MgD, a cardiomyopathy develops which may result from a cascade of inflammatory events. In rodent models of dietary MgD, a significant rise in circulating levels of proinflammatory neuropeptides such as substance P (SP) and calcitonin gene-related peptide among others, was observed within days (1–7) of initiating the Mg-restricted diet, and implicated a neurogenic trigger for the subsequent inflammatory events; this early “neurogenic inflammation” phase may be mediated in part, by the Mg-gated N-methyl-D-aspartate (NMDA) receptor/channel complex. Deregulation of the NMDA receptor may trigger the abrupt release of neuronal SP from the sensory-motor C-fibers to promote the subsequent pro-inflammatory changes: elevations in circulating inflammatory cells, inflammatory cytokines, histamine, and PGE₂ levels, as well as formation of nitric oxide, reactive oxygen species, lipid peroxidation products, and depletion of key endogenous antioxidants. Concurrent elevations of tissue CD14, a high affinity receptor for lipopolyssacharide, suggest that intestinal permeability may be compromised leading to endotoxemia. If exposure to these early (1–3 weeks MgD) inflammatory/pro-oxidant events becomes prolonged, this might lead to impaired cardiac function, and when co-existing with other pathologies, may enhance the risk of developing chronic heart failure.     

The relationship between serum trace element levels and clinical parameters in patients with fibromyalgia

We examined the association between serum trace elements and clinical findings such as number of sensitive tender points, severity of fatigue and functional status in patients with fibromyalgia (FM). Thirty-two patients diagnosed as having FM according to the ACR 1990 criteria and 32 normal healthy controls (NHC) were included in this study. The demographic data, disease duration, number of tender points and accompanying symptoms (fatigue, sleep disorders, headache, paresthesia, irritable bowel syndrome, sicca symptoms, Raynaud's phenomena) of the patients were noted. Visual analog scale (10 cm) was implemented to estimate daily severity of pain and fatigue. Fibromyalgia impact questionnaire was used for functional assessment. Serum selenium (mug/dL) and serum zinc (mug/dL) levels were measured by atomic absorption spectrometer. Serum magnesium (mmol/L) level was measured by the original kits of Abbott Aeroset auto-analyzer. The mean age of patients in FM group and NHC were calculated as 42.9 (SD = 7.7) years and 41.3 (SD = 9.7) years, respectively. Serum levels of zinc (P = 0.001) and magnesium (P = 0.002) were significantly decreased by FM groups, whereas there was no considerable difference with selenium levels of both groups (P > 0.05). Association between serum zinc level and number of tender points (P = 0.008) and that between fatigue and magnesium level (P = 0.003) was found as meaningful. According to the results of this study, it was asserted that serum magnesium and zinc levels may play an important role in the pathophysiology of FM.     

长QT间期扭转型室性心动过速发病机制探讨

狗静脉注射氯化铯(CsCl)所致的多形性室性心动过速(室速)基本符合长QT间期扭转型室速(TdP)的特点。右室心内膜单相动作电位(MAP)记录表明,CsCl可诱发早期后除极电位(EAD),TdP发作与EAD密切相关,硫酸镁(MgSO_4)可使EAD消失,TdP也获控制,提示TdP为EAD触发活性所致。Cs~ 为细胞膜K~ 通道阻滞剂,延长复极时间,增加内向Na~ /Ca~(2 )流,由此产生EAD,而Mg~(2 )为细胞膜K~ 通道激动剂,因此,Mg~(2 )对Cs~ 具对抗作用。     

门冬氨酸钾镁治疗心力衰竭并心律失常的临床分析

目的探讨门冬氨酸钾镁治疗心力衰竭并心律失常的疗效。方法选择心力衰竭合并心律失常患者96例为治疗组，在常规综合控制心力衰竭、抗心律失常治疗的基础上，加用门冬氨酸钾镁注射液静滴；另随机抽取相应患者93例为对照组，进行疗效对比。结果治疗组用药后血清钾、镁分别为（4．50±0．31）mmol／L和（1．10±0．11）mmol／L，与用药前的（3．92±0．32）mmol／L和（0．77±0．10）mmol／L相比，差异有统计学意义（P〈O．05）。治疗前治疗组和对照组血BNP水平分别为（7560．5±56．3）pg／ml和（7620．2±54．4）pg／ml，治疗后分别为（1542．3±53．2）pg／ml和（2450．2±51．3）pg／ml，前后相比差异有统计学意义（P〈O．05）。治疗组总有效病例91例，有效率94．7％；对照组有效病例73例，有效率78．3％，两组比较差异有统计学意义（P〈0．05）。结论门冬氨酸钾镁治疗心力衰竭合并心律失常疗效较好，副作用少。     

硼镁石粉有效灭螺成分的探讨

目的阐明硼镁石粉灭螺作用的有效成分.方法矿石样品经HNO3及HNO3-HClO4方法消解后,采用石墨炉原子吸收法测其砷、铅、镉等元素的含量;采用WHO"杀螺剂实验室终筛方法"中的浸泡法进行灭螺试验.结果硼镁石粉(灭螺灵1号)及西藏改则的硼镁矿石中砷含量分别达34.10μg/g及61.70μg/g,远高于其他硼镁矿石,灭螺实验显示砷及硼化合物均具有灭螺作用.结论西藏硼镁石粉中的砷含量偏高,其杀灭钉螺的有效成分可能是砷及硼化合物.     

50%硫酸镁溶液中过氧化氢稳定性的影响因素分析

目的:考察pH值和加入不同浓度金属离子络合物乙二胺四乙酸二钠(EDTA-Na2)对50%硫酸镁溶液中过氧化氢稳定性的影响,为过氧化氢作为防腐剂使用提供试验依据。方法:在pH值3.69、3.80、4.02、4.77、6.40、6.81和加入EDTA-Na20.01%、0.02%、0.04%、0.08%、0.16%的条件下,测定2厂家50%硫酸镁溶液中过氧化氢在贮存60d过程中的含量变化,分析pH值和EDTA-Na2对过氧化氢稳定性的影响。结果:不同pH值条件下过氧化氢贮存5d后含量均为0;加入0.04%以下浓度的EDTA-Na2贮存60d后过氧化氢含量均为0,加入0.04%以上浓度的EDTA-Na2贮存60d后过氧化氢的含量均约为50%。结论:溶液pH值对过氧化氢无稳定作用,加入EDTA-Na2对过氧化氢有一定的稳定作用。     

还原型谷胱甘肽联合异甘草酸镁治疗酒精性肝病的对照研究

目的:观察还原型谷胱甘肽片联合异甘草酸镁注射液静脉滴注治疗酒精性肝病的临床疗效。方法:60例酒精性肝病患者均戒酒,随机分为治疗组(30例)和对照组(30例)。治疗组给予还原型谷胱甘肽片联合异甘草酸镁注射液静脉滴注,对照组仅给予异甘草酸镁注射液静脉滴注,疗程均为4周。结果:2组患者治疗后临床症状、体征、实验室检查及彩超检查结果均有一定程度的改善,且治疗组疗效优于对照组,2组比较差异有统计学意义(P<0.05)。结论:还原型谷胱甘肽片联合异甘草酸镁注射液治疗酒精性肝病疗效好,未见明显不良反应。