Effects of locally applied nerve growth factor to the inferior alveolar nerve histology in a rabbit model of mandibular distraction osteogenesis

Distraction osteogenesis (DO) is widely used in deformities and defects of the craniofacial bone. Accelerating inferior alveolar nerve (IAN) recovery would aid the process. Nerve growth factor (NGF) plays a vital role in peripheral nerve regeneration. In this study, the ability of locally applied human NGF beta (hNGFβ) to enhance the morphological recovery of the IAN in a rabbit model of mandibular DO was studied. Rabbits underwent bilateral DO with a rate of 0.5 mm per 12 h. Two doses of 40 μg hNGFβ in buffer were injected into callus at the beginning the of consolidation time. The contralateral side received injections of placebo. Rabbits were killed at 14 and 28 days. IAN specimens were subjected to histological and histomorphometric analysis. In both 14 and 28 days consolidation experiments, nerve histological analysis showed less degeneration and more regeneration in nerve fibers on the hNGFβ treated side than the control side. Histomorphometric analysis showed that the myelinated fiber density on the hNGFβ treated side was significantly higher than on the control side (p < 0.01). The data indicate that locally applied hNGFβ can accelerate the morphological recovery of the IAN and may play a role in reducing nerve injury in mandibular DO clinically.     

铅暴露对生长发育期大鼠肝、肾功能及血液学指标的损伤作用研究

目的通过检测铅中毒大鼠肝、肾功能及部分血液学指标,阐明铅暴露对发育期大鼠肝、肾功能及血液学指标的损伤作用,为铅中毒的毒性效应研究以及防治提供实验依据。方法大鼠醋酸铅饮水染毒建立模型,通过模型肝、肾功能及血液学指标的改变,探讨铅暴露对大鼠肝、肾功能的损伤作用。结果染铅大鼠血清天门冬氨酸氨基转移酶(AST)、碱性磷酸酶(ALP)水平较对照组显著增高,差异有统计学意义(P<0.05);血清胆碱酯酶(CHE)水平较对照组显著降低,差异有统计学意义(P<0.05),提示肝细胞损伤;染铅大鼠血清尿素氮(BUN)、胱抑素C(CYS-C)水平较对照组显著增高,差异有统计学意义(P<0.05),提示肾小球率过滤及肾功能损伤;铅暴露大鼠红细胞、血红蛋白、血小板数量下降显著,差异有统计学意义(P<0.05),提示贫血及凝血机制障碍。结论慢性铅暴露可以引起生长发育期大鼠的肝、肾功能损伤及贫血的发生。     

Research progress in transient receptor potential vanilloid 1 of sensory nervous system

The transient receptor potential vanilloid subfamily member 1 (TRPV1) is a protein mainly expressed in sensory neurons and fibers, such as in trigeminal ganglion and dorsal root ganglion, and has been indicated to be involved in several physiological and pathological processes. Studies on thermal activation have revealed that phosphorylation is involved in TRPV1 activation and 2 putative phosphorylation sites, Ser residues 502 (Ser-502) and Ser residues 800 (Ser-800), have been recently confirmed to possess the capability of resensitizing TRPV1. In addition to acidification, alkalization has also been proved to be a highly effective stimulator for TRPV1. TRPV1 could be regulated by various physical and chemical modulators, as well as the chronic pain. TRPV1 plays a crucial role in the transmission of pain signals, especially under inflammation and the neoplasm conditions, and it can also modulate nociceptive afferents by reinforcing morphine tolerance. The present review mainly focused on the structural and functional complexities of TRPV1, together with its activation and modulation by a wide variety of physical and chemical stimuli. Its pharmacological manipulation (sensitization/desensitization) and therapeutical targets were also discussed.     

RFID技术在伤员救治中的应用

介绍射频识别技术的特点、系统基本组成及工作原理，阐明野战卫勤保障指挥系统组成及各部分的功能，描述利用该系统救治伤员的流程，指出运用RFID技术具有高效、高准确度、适用范围广的优势，对野战伤员搜救很有帮助。     

半套式PCR扩增人抗HFRS病毒抗体基因及Fb段基因的克隆和序列分析

从肾综合征出血热恢复期患者外周血淋巴细胞(PBL)中提取细胞总RNA，反转录成cDNA。以之为模板，用半套式聚合酶链反应(PCR)扩增人IgG抗体Fd段及轻链基因，并将Fd段基因克隆入噬菌体载体pcomb3；经酶切鉴定后，再亚克隆入pGEM7zf，筛选阳性克隆测序。经计算机分析，Fd段基因的全长为639bp，编码213个氨基酸，属于人IgG2亚类。     

维生素D类似物EB1089对肝癌细胞增殖和凋亡的影响

目的探讨维生素D类似物EB1089对肝癌细胞增殖和凋亡的影响。方法体外培养维生素D3受体(VDR)阳性和阴性的肝癌细胞株HepG2和HCCT细胞,培养时添加100、10和1nmol/LEB1089,分别作用2、4和6d后,用四唑蓝比色实验(MTT)、平板克隆形成实验检测细胞的存活和生长;用反转录PCR(RTPCR)检测VDRmRNA的表达;用流式细胞仪和电子显微镜检测细胞凋亡。结果EB1089对VDRmRNA表达阳性的HepG2细胞的抑制率为175%～721%,对VDRmRNA表达阴性的HCCT细胞没有抑制作用;电镜结果显示EB1089可诱导HepG2细胞凋亡,流式细胞仪结果显示凋亡细胞的百分比为214%,并可阻滞细胞周期于G1期。结论EB1089对人肝癌细胞株HepG2的增殖具有抑制作用,可通过VDR受体抑制人肝癌细胞的增殖,并可诱导HepG2细胞凋亡。