Insulin-like growth factor-I regulates proliferation and osteoblastic differentiation of calcifying vascular cells via extracellular signal-regulated protein kinase and phosphatidylinositol 3-kinase pathways

Vascular calcification develops within atherosclerotic lesions and results from a process similar to osteogenesis. One of the paracrine regulators of bone-derived osteoblasts, insulin-like growth factor-I (IGF-I), is also present in atherosclerotic lesions. To evaluate its possible role in vascular calcification, we assessed its in vitro effects on proliferation and differentiation in calcifying vascular cells (CVCs), a subpopulation of bovine aortic medial cells. Results showed that IGF-I inhibited spontaneous CVC differentiation and mineralization as evidenced by decreased alkaline phosphatase (AP) activity and decreased matrix calcium incorporation, respectively. Furthermore, IGF-I inhibited the AP activity induced by bacterial lipopolysaccharide, TNF-alpha, or H2O2. It also induced CVC proliferation based on 3H-thymidine incorporation. Results from Northern analysis and tests using IGF-I analogs suggest that IGF-I effects are mediated through the IGF-I receptor. IGF-I also activated both the extracellular signal-regulated protein kinase (ERK) and phosphatidylinositol 3-kinase (PI3K) pathways. Inhibition of either the ERK or PI3K pathway reversed IGF-I effects on CVC proliferation and AP activity, suggesting a common downstream target. Overexpression of ERK activator also mimicked IGF-I inhibition of lipopolysaccharide-induced AP activity. These results suggest that IGF-I promotes proliferation and inhibits osteoblastic differentiation and mineralization of vascular cells via both ERK and PI3K pathways.     

非杓型高血压对左心室肥厚的影响及其临床意义

目的：以杓型高血压患者为对照，探讨非杓型高血压在左心室肥厚发生和发展中的作用。方法：应用２４小时动态血压和超声心动图检测２３０例高血压患者，选择年龄、病程、昼间血压基本相同的杓型、非杓型高血压患者１５０例，其中男性各４５例，女性各３０例。结果：非杓型高血压患者舒张末期左心房内径显著大于杓型高血压患者，男性分别为３５．８±２．９ｍｍ与３１．２±２．７ｍｍ（Ｐ＜０．０１）；女性分别为３２．４±２．５ｍｍ与２９．４±１．８ｍｍ（Ｐ＜０．０５）。女性杓型、非杓型高血压患者间舒张末期左心室内径的差异（４９．５±３．２ｍｍ与５４．８±３．７ｍｍ，Ｐ＜０．０１）比男性（５３．８±４．６ｍｍ与５７．４±４．５ｍｍ，Ｐ＜０．０５）更为显著。非杓型高血压患者左心室重量指数显著大于杓型高血压患者，男性分别为１５８．０±７．９ｇ／ｍ２与１３０．０±６．７ｇ／ｍ２（Ｐ＜０．０１）；女性分别为１３８．０±５．６ｇ／ｍ２与１１５．０±４．７ｇ／ｍ２（Ｐ＜０．０１）。结论：非杓型高血压患者左心室肥厚的检出率比杓型高血压患者为高。     

Localization of denaturation bubbles in random DNA sequences

We study the thermodynamic and dynamic behaviors of twist-induced denaturation bubbles in a long, stretched random sequence of DNA. The small bubbles associated with weak twist are delocalized. Above a threshold torque, the bubbles of several tens of bases or larger become preferentially localized to AT-rich segments. In the localized regime, the bubbles exhibit "aging" and move around subdiffusively with continuously varying dynamic exponents. These properties are derived by using results of large-deviation theory together with scaling arguments and are verified by Monte Carlo simulations.     

Comparison of sotalol versus amiodarone in maintaining stability of sinus rhythm in patients with atrial fibrillation (Sotalol-Amiodarone Fibrillation Efficacy Trial [Safe-T])

The Sotalol-Amiodarone Fibrillation Efficacy Trial (SAFE-T) is a randomized, double-blind, multicenter, placebo-controlled trial in which the effects of sotalol and amiodarone in maintaining stability of sinus rhythm are being examined in patients with persistent atrial fibrillation at 20 Veterans Affairs medical centers. The time to the occurrence of atrial fibrillation or flutter in patients with atrial fibrillation converted to sinus rhythm is the primary outcome measure, with a number of parameters as secondary end points. SAFE-T had randomized 665 patients when enrollment terminated on October 31, 2001. Follow-up of patients continued until October 31, 2002, for a maximum period of 54 months and a minimum period of 12 months for all patients.     

Relationship between Fas/FasL expression and apoptosis of colon adenocarcinoma cell lines

INTRODUCTIONFas/ FasL system has been identified as a keymediator of apoptosis in tumor cells[1-4]. Theoccurrence and development of neoplasm are closelyrelated to apoptosis[5-7] Most chemotherapeuticdrugs kill cancer cells mainly by inducingapoptosis[8-14].'     

双源CT与传统CTA-DSA技术在头颈部血管成像的对比应用

目的：探讨炫速双源CT双能量成像在头颈部动脉血管中应用的价值。方法96例患者随机分成两组：A组炫速双源组(n=48),使用炫速双源行头颈部CTA双能量检查,扫描参数140 kV/Sn80 kV,210/105 mAs;月组传统Neuro-DSA组(n=48),使用炫速双源内的传统Neuro-DSA常规扫描方法,参数120 kV/245 mAs;同时比较两组检查的悦栽容积剂量指数(CTDI vol)以及进行图像质量主观评分。结果两组间影像质量的主观评估差异有统计学意义(P<0.05),两组间辐射剂量差异有统计学意义(P<0.05),A组有效剂量为(7.54±0.05)mGy,较B组的(10.67±0.08)mGy降低<25豫。结论头颈部血管炫速双源双能量成像与传统Neuro-DSA成像对比双能成像辐射小,成像质量效果好,但颅底骨存在过度减影的缺点,技术亟需改进。     

中西医结合治疗骨折后膝关节粘连性僵硬的临床疗效

目的：探讨中西医结合治疗骨折后膝关节粘连性僵硬患者的临床效果。方法：运用随机抽样的方法选取我院2013年1月～2014年9月收治的140例骨折后膝关节粘连性僵硬患者,依据随机数字表法将这些患者分为研究组和对照组两组,各70例。给予对照组患者单纯西医治疗,给予研究组患者中西医结合治疗,然后对两组患者的临床疗效进行统计分析。结果：研究组患者中显效46例,有效22例,治疗的总有效率为97.1%（68/70）;对照组患者中显效36例,有效18例,治疗的总有效率为77.1%（54/70）。研究组患者治疗的总有效率显著高于对照组。结论：中西医结合治疗骨折后膝关节粘连性僵硬患者的临床效果显著。     

地氯雷他定联合复方甘草酸苷治疗慢性荨麻疹的临床观察

目的观察地氯雷他定联合复方甘草酸苷对慢性荨麻疹患者的临床疗效。方法将笔者医院从2013年1~6月收治的140例慢性荨麻疹患者按随机数表法均分为实验组70例和对照组70例,实验组采用地氯雷他定联合复方甘草酸苷治疗,对照组单用地氯雷他定治疗。比较两组CD4+和CD8+淋巴细胞比例的变化、临床疗效、治疗后复发率以及药物不良反应的发生率。结果治疗前两组CD4+和CD8+淋巴细胞亚群比例差异无统计学意义(P>0.05);治疗后,CD8+淋巴细胞两组均出现显著减低(P<0.05),CD4+淋巴细胞和CD4+/CD8+比值两组均出现显著升高(P<0.05),但治疗后实验组CD4+淋巴细胞和CD4+/CD8+比值均显著高于对照组(P<0.05),而CD8+淋巴细胞实验组又显著低于对照组(P<0.05)。实验组临床治疗有效率为87.1%显著高于对照组的75.8%(P<0.05)。随访6个月后实验组和对照组复发率分别为55.7%和72.9%,两组之间差异具有统计学意义(P<0.05)。实验组不良反应发生率为8.6%,对照组不良反应发生率为7.1%,两组之间差异无统计学意义(P>0.05)。结论地氯雷他定联合复方甘草酸苷能有效治疗慢性荨麻疹,安全有效,且能减少复发。     

阿魏酸哌嗪联合血液透析治疗肾综合征出血热急性肾衰竭的临床疗效及安全性分析

目的 探讨运用阿魏酸哌嗪联合血液透析治疗肾综合征出血热急性肾衰竭的临床疗效及安全性.方法 选取遂宁市中心医院2011年1月至2014年3月收治的肾综合征出血热致急性肾衰竭患者120例作为研究对象,随机分为对照组60例,试验组60例,均给予常规治疗,对照组加用血液透析治疗,试验组在对照组基础上联合阿魏酸哌嗪治疗,200 mg/次,3次/d,治疗4周,观察两组治疗效果及治疗前后血浆内皮素及血清肌酐变化情况,同时记录两组患者血尿素氮(BUN)达标时间及尿蛋白消失时间,并观察不良反应.结果 试验组治愈率为91.67％,与对照组83.33％比较,差异无统计学意义(P＞0.05);两组治疗前血浆内皮素及血清肌酐水平差异无统计学意义(P＞0.05),治疗后明显低于治疗前,且治疗后试验组血浆内皮素及血清肌酐水平较对照组明显降低(P＜0.05);试验组BUN达标及尿蛋白消失时间较对照组明显缩短(P＜0.05);试验组不良反应发生率为13.33％,与对照组15.00％比较,差异无统计学意义(P＞0.05).结论 对于肾综合征出血热导致的急性肾衰竭患者,运用血液透析联合阿魏酸哌嗪治疗,效果显著,能有效促进肾功能恢复,且安全性较高.