Akt和8－OHdG在铁过载肝细胞中的表达

目的：铁过载可以促进肝细胞增生甚至肝的纤维化,但其中的确切机制尚不清楚。本文通过喂食大鼠羰基铁致铁过载,后行大部分肝切除建立动物模型,检测不同时间点的目标蛋白来研究铁过载对肝细胞增殖影响的机制。方法：通过免疫组织化学方法分别检测了Akt和8－OHdG水平。结果：正常组0小时肝实质细胞的核中8－OHdG的表达。24小时8－OHdG的表达显著增加并且达到顶峰。实验组同样在细胞核中有表达,12小时8－OHdG的表达显著增加并且达到顶峰,在这之后这种表达逐渐减弱（图1F）。正常组肝实质细胞细胞质中Akt有表达,在36小时Akt表达最强。在实验组0小时同样检测出 Akt表达,到24小时这种表达最为显著。结论：铁过载的肝细胞通过 PI3K／AKt信号通路引起了肝细胞的再生。     

学龄前儿童机体铁营养状况及膳食的影响因素

目的了解学龄前儿童机体铁的营养状况及膳食影响因素.方法膳食调查采用称重记帐法,连续调查5d.发铁含量测定采用原子吸收光谱法.结果膳食中铁的摄入量为22.01mg/人日,达膳食营养供给量(RDA)的220%,其中植物性铁占82.48%,动物性铁仅占17.52%.发铁含量均值为(26.19±12.42)μg/g,发铁不足率为33%.结论被调查对象铁营养状况不良,铁的食物来源不合理,应增加血红素铁、维生素C及维生素B2的摄入量,以提高铁的生物利用率.     

西安市城区孕妇铁营养状况的动态观察

调查西安市城区孕妇铁营养状况。方法 随机测查不同孕期孕妇的血红蛋白(Hb)、锌原卟啉(ZPP)、血清铁蛋H(SF)、红细胞内铁蛋白(EF)。结果 妊娠20～40周期间,Hb、SF、EF值逐渐降低,ZPP逐渐增高。结论 从孕中期起,随孕期的增加孕妇铁营养状况持续变差。采取预防性补铁措施十分迫切。     

559例婴幼儿铁缺乏症调查与防治

本文对6月～3岁559名婴幼儿进行铁缺乏症调查与防治。缺铁性贫血(IDA)患病率为53.85％,无贫血儿铁减少期(ID)及红细胞生成铁缺乏期(IDE)共48.11％,且各年龄组IDE均明显高于ID。贫血与发Fe、Zn无明显差异,而与发铜有非常明显差异。以调整饮食,铁强化食品,果味维生素C对轻度贫血232例分别进行防治观察,均有同样效果。     

幽门螺杆菌感染与儿童缺铁性贫血关系的临床研究

目的探讨幽门螺杆菌(Hp)感染与儿童缺铁性贫血(IDA)之间的关系。方法从因再发性腹痛就诊的患儿中,抽取13C呼气试验阳性者26例为观察组,13C呼气试验阴性者22例为对照组。两组分别检测血清铁蛋白(SF)和血常规。结果观察组和对照组比较SF、血红蛋白、红细胞计数、平均红细胞体积和平均血红蛋白浓度差异有统计学意义(P<0.05或<0.01)。白细胞数和血小板数两组差异无统计学意义(P>0.05)。结论Hp感染与儿童IDA发病有关,Hp感染可能是IDA的发病因素之一。     

应用血清铁蛋白与运铁蛋白受体比值评价儿童铁营养状况

目的利用运铁蛋白受体、血清运铁蛋白受体与血清铁蛋白比值评价儿童铁补充干预效果。方法选择某幼儿园3~6岁健康儿童,按班随机分为3组,A组为每日补充组(一周补充5次微量营养素补充剂)、B组为间歇性补充组(每周补充一次微量营养素补充剂)、C组为空白对照组。从3组儿童中,每组随机抽取30名儿童,测定干预前后血清铁蛋白(SF)和运铁蛋白受体(sTfR)含量,并计算运铁蛋白受体含量与血清铁蛋白含量比值(RF)和机体铁含量(BFe)。结果干预前,三组儿童的sTfR、SF、RF、BFe含量差异无统计学意义(P>0.05)。干预后,A、B组儿童的sTfR、RF显著降低,BFe含量显著升高,而C组儿童的sTfR、RF、BFe无明显变化(P>0.05);干预后,A组、B组儿童的sTfR、RF显著低于C组(P<0.05),BFe含量显著高于C组(P<0.05);A组与B组之间sTfR、BFe含量及RF比值差异无统计学意义(P>0.05)。结论血清运铁蛋白受体含量与血清铁蛋白比值以及计算出的机体铁含量能够很好地用于评价儿童铁干预效果。     

铁强化食盐预防缺铁性贫血效果的观察

本文试以食盐为载体,使在食盐中每日为学龄前儿童增加元素铁5～10mg,对象为5岁的幼儿园儿童165名,分别在城镇与农村观察一年。初步的结果是:实验组与对照组在开始时的血红蛋白水平一致,但一年后,实验组由原来的平均值11.78±0.57增加至12.72±0.72,比对照组有明显的改善,这是解决缺铁性贫血的一种实际方法。     

Metal ions-bridged J-aggregation mediated nanoassembly composition for breast cancer phototherapy

Recently, the highly ordered J-aggregates of organic dyes with intriguing optical properties have received considerable attention in biomedical applications. Herein, binary metal ions Mn(Ⅱ)/Fe(Ⅲ) are used to induce the formation of indocyanine green(ICG) J-aggregates.Further, the sheet-like J-aggregates are able to act as "carriers" for loading hydrophobic chemotherapeutic gambogic acid(GA), realizing the effect of "killing two birds with one stone" for both treatment and delivery. The as-design...     

Post-Traumatic Epilepsy: Cellular Mechanisms and Implications for Treatment

Summary: Epilepsy complicates severe head trauma. Development of persistent seizures appears to correlate with the extent of trauma. Although early reports suggested that prophylactic administration of antiepileptic drugs would prevent epileptogenesis, controlled studies have failed to corroborate this assumption. Head trauma initiates a sequence of responses that includes altered blood flow and vasoregulation, disruption of the blood-brain barrier, increases in intracranial pressure, focal or diffuse ischemia, hemorrhage, inflammation, necrosis, and disruption of fiber tracts. The presence of an intracranial hematoma has a robust association with the development of post-traumatic epilepsy. Extravasation of blood is followed by hemolysis and deposition of heme-containing compounds into the neuropil, initiating a sequence of univalent redox reactions and generating various free radical species, including superoxides, hydroxyl radicals, peroxides, and perferryl ions. Free radicals initiate peroxidation reactions by hydrogen abstraction from methylene groups adjacent to double bonds of fatty acids and lipids within cellular membranes. Intrinsic enzymatic mechanisms for control of free radical reactions include activation of catalase, peroxidase, and superoxide dismutase. Steroids, proteins, and tocopherol also terminate per-oxidative reactions. Tocopherol and selenium are effective in preventing tissue injury initiated by ferrous chloride and heme compounds. Treatment strategies for prevention or prophylaxis of post-traumatic epilepsy must await absolute knowledge of mechanisms. Antioxidants and chelators may be useful, given the speculation that peroxidative reactions may be an important component of brain injury responses. However, potential treatment strategies involving -y-aminobutyric acid (GABA) agonists, NMDA receptor antagonists, and barbiturates need further scientific assessment.     

ZnT7及游离锌离子在小鼠室管膜和脉络丛细胞的分布

目的 研究锌转运体7（ZnT7）和游离锌离子在小鼠脊髓室管膜和脉络丛上皮细胞中的分布.方法 应用ZnSe金属自显影技术（AMG）检测硒酸钠注射1.5h后小鼠脊髓室管膜细胞及脑室脉络丛上皮细胞的游离锌离子;应用免疫组织化学SABC法检测小鼠脊髓室管膜细胞及脑室脉络丛上皮细胞中ZnT7的表达.结果 光镜下观察AMG染色的切片,小鼠脊髓室管膜细胞及脑室脉络丛上皮细胞中均有游离锌离子的分布;免疫组织化学结果表明,脊髓室管膜细胞及脉络丛上皮细胞中均有ZnT7的表达,且与游离锌离子分布区域基本一致.结论 锌离子可能在脊髓室管膜细胞及脉络丛上皮细胞内发挥重要作用,脊髓室管膜细胞及脉络丛上皮细胞可能在脑脊液锌转运过程中发挥重要的作用.