人源化抗体构建过程中假链的产生及应对策略

目的在人源化抗体构建过程中，采用方便、快捷的分子克隆手段。消除SP2／0内源性畸形轻链转录本以获得正确的轻链cDNA。方法在mRNA抽提时，不用常规的TRIZOL法抽提总RNA，而采用经腹腔培养。生长状态良好的杂交瘤细胞。用QIAGEN公司Oligotex Direct mRNA Purification Kit，将polyA^＋的mRNA富集。可有效减少畸变转录本的含量，提高功能型mRNA的丰度。利用polyA^＋RNA。采用RT-PCR，我们成功地克隆到了轻链可变区序列，序列分析证实读码框完全正确，属于轻链可变区基因。结果NCBI数据库BLAST显示。克隆的基因序列符合小鼠lg可变区特征，具有正确的CDR和FR功能区及VJ连接区。结论采用polyA^＋ mRNA富集技术，成功克隆获得阻断型抗人CD154 mAb（4F1）单克隆抗体的轻链、重链可变区基因，成功地消除了SP2／0内源性畸形转录本对免疫球蛋白功能性轻链基因的影响。     

麻痹性痴呆12例临床分析

目的探讨麻痹性痴呆(GPI)患者的临床表现,实验室检查、影像学、脑电图特征以及诊断、治疗及预后。方法回顾性分析经临床和实验室确诊的12例GPI患者的相关资料。结果GPI患者临床以智能障碍、精神异常、癫痫最常见。12例患者血清甲苯胺红凝集试验(TRUST)和梅毒螺旋体明胶凝集试验(TPPA)均( ),脑脊液TPPA均( ),而TRUST( )9例。头颅MRI检查结果示大脑皮质萎缩。3例以肢体抽搐为表现者脑电图可见广泛中高幅尖慢波,余脑电图为弥漫性慢波。经抗梅毒治疗,痊愈4例,显效5例,好转3例。结论GPI现已是我国神经梅毒分型中极常见类型,多见于中年男性,临床表现多变,早期误诊率高,早期发现、及时正规治疗预后好。     

Short-term suppression of plasma free fatty acids fails to improve insulin sensitivity when intramyocellular lipid is elevated.

AIMS: Metabolic responses to manipulation of the plasma free fatty acid (FFA) concentration were assessed in six healthy men via cross-over design to determine whether FFAs independently influence insulin sensitivity. METHODS: Intramyocellular lipid (IMCL) was measured by proton magnetic resonance spectroscopy and insulin sensitivity via frequently sampled intravenous glucose tolerance test (IVGTT) after 67 h of two identical low carbohydrate/high fat (LC) diets which were used to elevate IMCL and plasma FFAs. To uncouple the influence of FFAs and IMCL on insulin sensitivity, FFAs were suppressed 30 min prior to and during IVGTT in one treatment [LC + nicotinic acid (NA)] by NA ingestion. RESULTS: Vastus lateralis IMCL was significantly elevated in LC (13.3 +/- 1.1 x 10(-3)) and LC + NA (13.5 +/- 1.1 x 10(-3)) (P < 0.01 for both), but was not different between conditions (P > 0.05). Plasma FFAs were raised in LC (0.79 +/- 0.08 mmol/l) and LC + NA (0.80 +/- 0.11 mmol/l) (P < 0.01 for both) and were significantly reduced by NA ingestion prior to (0.36 +/- 0.05 mmol/l, P < 0.01) and during IVGTT (P < 0.05) in LC + NA. Despite marked differences in plasma FFA availability, insulin sensitivity and glucose tolerance were not different between LC and LC + NA (P > 0.05 for both). CONCLUSIONS: Plasma FFAs appear to exert no immediate effect on insulin sensitivity/glucose tolerance independent of their action on intracellular lipid moieties. Further research is required to elucidate the duration of FFA suppression required to restore insulin sensitivity following lipid-induced insulin resistance.     

adaptive fourier threshold filtering: A method to reduce noise and incoherent artifacts in high resolution cardiac images

We introduce an image processing method which reduces white noise and random artifacts in sets of high resolution, time resolved images. At each pixel, the processing consists of: (1) the isolation of a time intensity curve (TIC), (2) Fourier transformation of each TIC, (3) application of a threshold to remove low intensity coefficients, (4) inverse transformation to generate noise reduced TICS which are recombined to form images with improved signal-to-noise ratio (SNR). Noise filtering by Fourier thresholding is demonstrated on a set of cardiac images, resulting in a reduction of the noise energy by approximately 90%.     

Ultrasound biomicroscopic features of spherophakia

Background: Spherophakia is an uncommon diagnosis. This is the first case report of spherophakia evaluated by ultrasound biomicroscopy.
Methods: Ultrasound biomicroscopy is a new diagnostic technique developed by one of the authors and provides images with microscopic resolution of the anterior segment. A patient with spherophakia was evaluated by ultrasound biomicroscopy (Zeiss-Humphrey, 50MHz) before and after YAG laser iridotomy.
Results: Ultrasound biomicroscopic assessment revealed a shallow anterior chamber, a very steep anterior lens curvature, iridolenticular contact, elongated zonules, and an increased distance between the lens equator and the ciliary processes. Angle closure glaucoma was due to a pupil block mechanism. The pupil block was relieved by YAG laser iridotomy.
Conclusions: Ultrasound biomicroscopy is a useful technique to confirm the diagnosis of spherophakia. The pupil block in spherophakia is relieved by YAG laser iridotomy.     

颅内肿瘤影像学诊断及进展

颅内肿瘤是中枢神经系统常见病,它包括起源于颅内各种组织的原发性肿瘤及其他部位转移到颅内的继发性肿瘤。颅内肿瘤的诊断主要依靠影像学检查,伴随现代高科技的发展,常规影像学技术也正在发生着日新月异的进步,颅内肿瘤的诊断准确度越来越高。本文主要介绍颅内常见肿瘤的普通X线、CT、MRI图像特点及影像学进展。     

ApoMT对CdMT肾毒性保护作用研究

本文研究了去除金属离子的金属硫蛋白（ApoMT）对镉金属硫蛋白（CdMT）肾毒性作用的影响。结果发现，与单独给予CdMT比较，ApoMT能降低尿蛋白量和尿碱性磷酸酶（AKP）活性，并能促进尿Cd的排泄。肾组织形态学结果显示肾近曲小管损伤程度明显减轻。提示ApoMT对CdMT肾小管损伤具有保护作用。