Enzyme-linked immunosorbent assay of human placenta type glutathione s-transferase and its application in the diagnosis of hepatocarcinoma

GST-π was purified from human placenta and its antiserum was raised in rabbits. The antibody IgC was purified and degraded into Fab' fragment which was conjugated with horseradish peroxidase (HRP) using N-succinimidyl-4-(N-maleimido-methyl) cyclo-hexane-1-carboxylate (SMCC) as crosslinking reagent to produce Fab'-HRP conjugate. A sandwich ELISA was established for the microquantitative determination of GST-π. The sensitivity was 11 pg/tube, which was far more sensitive than the radioimmunoassay so far reported. Using this method, the serum GST-π of 41 cases normal adult was found to be 1.06±0.94 ng/ml. The upper limit of the normal value was 2.6 ng/ml. In 30 cases of primary hepatocarcinoma, the level of serum GST-π was 24.4± 17.4 ng/ml, which was 23 times higher than the normal average value (P<0.01). The positive rate was 90%. In contrast, serum GST-π in 25 cases of chronic hepatitis was determined to be 1.74±1.16 ng/ml, which was not significantly different from the normal value (P>0.05). The     

Copolymerization of propene with 1-alkenes using a MgCl2/TiCl4 catalyst

Copolymerization of propylene

1 System name: propene.

and 1-alkenes (1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene) were studied with the catalyst system MgCl₂/TiCl₄-Al(i-Bu)₃. It was found that the polymerization productivity and the consumption rate of propylene are improved significantly in the presence of the comonomer. The total productivity of propylene/1-alkene copolymerizations decreases as follows: 1-octene > 1-decene > 1-dodecene > 1-hexadecene > 1-tetradecene. The reactivity ratios were estimated from the copolymerization results.     

Neurological manifestations in chronic mountain sickness: the burning feet-burning hands syndrome

OBJECTIVE: To characterise the clinical features and nerve biopsy findings in patients with chronic mountain sickness (CMS) living in the Peruvian Andes, with particular attention to the occurrence of the "burning feet-burning hands" syndrome. METHODS: Symptoms and signs were documented clinically in 10 patients with CMS and compared with those in five healthy subjects all living at 4338 metres altitude. Sural nerve biopsies were obtained from three patients with CMS.The nerve fibre population and endoneurial microvessels were analyzed morphometrically. RESULTS: All patients with CMS experienced burning and tingling paraesthesiae in the distal parts of their limbs. Similar but milder symptoms confined to the feet occurred in four of five controls. Three patients with CMS had a mild sensory neuropathy on examination, controls were clinically normal. Nerve biopsies showed a mild demyelinating neuropathy in all three with a reduction in the unmyelinated axon population in one. The endoneurial blood vessels showed a reduced thickness in the basal laminal zone compared with control values but were otherwise normal. CONCLUSIONS: Apart from well recognised symptoms and signs of CMS, the study has shown that such patients may also exhibit a mild sensory neuropathy. Its relation to the burning feet-burning hands syndrome, which was not confined to the patients but was also found in controls at altitude, is uncertain. The time course and pattern of the centrifugal resolution of the burning paraesthesiae complex on low altitude sojourn of high altitude natives raises the possibility that a mechanism involving altered axonal transport may be involved. The reduced thickness of the basal laminal zone of microvessels implies that adaptive structural changes to hypobaric hypoxia may also occur in peripheral nerve and are similar to those reported in other tissues of high altitude natives.     

Intracellular processing and toxicity of the truncated androgen receptor: nuclear congophilia-associated cell death

The pathogenesis of the selective motor neuron death in spinal bulbar muscular atrophy (SBMA) is not fully understood. Similar to observations with other mutant polyglutamine (poly Q) expanded proteins, truncated androgen receptor (AR) with expanded poly Q tract cause intracellular aggregates; however, the precise relationship between aggregates and disease pathogenesis is unresolved. In order to have a better understanding of the cellular processing and toxicity of the mutant AR, we focused on a short N-terminal portion of AR containing normal or expanded poly Q repeats, and have carried out biochemical, immunocytochemical, cytochemical and ultrastructural studies of BHK cells at different intervals after transfection. In cells expressing mutant truncated AR, using an anti-AR N-terminal antibody, we observed no immune staining in the nucleus and identified immune negative aggregates surrounded by immunopositive material in the cytoplasm. Congo red staining identified a component of aggregates with a beta-pleated secondary structure in both cytosol and nucleus, while electron microscopy revealed a fibrillary-granular material as the ultrastructural correlate. In addition, acid phosphatase staining and ubiquitin immunocytochemistry demonstrated that in transfected cells, both lysosomal and nonlysosomal degradation systems are actively involved in handling the mutant truncated AR. The temporal relationship of nuclear congophilia to a subsequent massive cell death suggests that entry of proteolytic cleavage products into the nucleus, perhaps the expanded poly Q stretch itself, may play an important role in cell toxicity.     

RP-HPLC进行甲氨蝶呤血药浓度监测时保留时间校准方法研究

目的 建立RP—HPLC进行MTX血药浓度监测时保留时间校准方法。方法应用容量因子与流动相比例的三次方多项式模型，建立MTX流动相比例与保留时间的函数，并通过此函数用保留时间求算流动相比例，与理论流动相比例比较，从而计算流动相应该补充组分的量，达到调整保留时间的目的。结果四种不同色谱条件下容量因子与流动相比例的三次方多项式模型拟合关系良好，R0均为1．000，保留时间经校准后RSD为0.9％(n=5)。结论本方法能准确校准因流动相比例引起变化的保留时间，适用于MTX血药浓度监测时保留时间的校准，方法新颖、有效、简单。     

干扰素α-1b治疗肾综合征出血热的临床疗效

目的 :观察干扰素α 1b对早期肾综合征出血热 (HFRS)的疗效。方法 :将诊断明确的早期HFRS 181例分成 2组。治疗组 94例 ,在液体综合疗法基础上给予干扰素α 1b ,10 0万U ,im ,qd ,疗程 3d ,少数重症患者适当增加剂量和疗程 ;对照组 87例仅采用液体综合疗法。结果 :治疗组用药后退热时间、低血压期、少尿期和多尿期持续时间 ,与对照组比较均明显缩短 (P <0 0 1)。治疗组未出现低血压期或少尿期 ,以及此 2期均未出现而直接进入多尿期的发生率较对照组明显升高 (P <0 0 1)。治疗组的并发症也较对照组减少。结论 :干扰素α 1b治疗早期HFRS临床疗效满意 ,不良反应少。     

降纤酶低分子肝素治疗短暂性脑缺血发作的研究

目的 观察降纤酶与低分子肝素治疗短暂性脑缺血发作的效果及副作用。方法 选择本院神经内科住院患者36例应用降纤酶10U加入加入250ml生理盐水中静脉滴注，隔日1次，共3次；低分子肝素0．5ml脐旁皮下注射，12h 1次，连用7—10d,同时常规给予复方丹参滴注，口服尼莫地平，维生素E，维生素C，停用低分了肝素后给予肠溶阿斯匹林75mg，每日1次口服。结果 治疗开始后TLA发作相继减少，停止发作时间分别为1d内9例，3d内15例，5d内12例。随访6个月—1年，1例2个月后复发，重新应用上药治愈。结论 降纤酶与低分子肝素治疗TLA安全有效、无明显副作用、不易复发。     

低分子肝素阿魏酸钠治疗不稳定型心绞痛

目的 了解低分子肝素与阿魏酸钠联合应用治疗不稳定型心绞痛的疗效，提高不稳定型心绞痛治疗效果。方法 选用本院治疗的120例病人，治疗组60例．对照组60例，对照组以静脉滴注二硝酸异山梨酯为主。治疗在对照组治疗基础上，采用低分子肝素5000U皮下注射，每日2次，连续7d，阿魏酸钠0．3加入5％葡萄糖液中缓慢滴注，1日1次，连用14d为一疗程。两组对比了心绞痛控制，心绞痛缓解和消失时间及心电图变化及治疗前后纤维蛋白原血浆比黏度等情况。结果 治疗组在心绞痛控制，心绞痛缓解和消失时间及心电图变化及血液比黏度，纤维蛋白原等情况，明显优于对照组。结论 低分子肝素联合阿魏酸钠治疗不稳定型心绞痛疗效显著。     

高效液相色谱法测定人血浆中氟尿嘧啶浓度

 目的测定人血浆中氟尿嘧啶的浓度。方法高效液相色谱法，测量氟尿嘧啶的波长λ_max=254nm，流动相为水-甲醇 冰醋酸(96.95∶3.0∶0.05),pH=3.5。结果回归方程为Y=11.82X+0.078(r=0.999 2)，其线性范围为0.66～42.00μg·mL^-1，最低检测浓度为0.154 9 μg·mL^-1(S/N=3)。结论该法简单、快速、结果准确，适用于临床氟尿嘧啶的药物浓度监测