Adelta and C primary afferents convey dorsal root reflexes after intradermal injection of capsaicin in rats

Antidromic activity was recorded in anesthetized rats from single afferent fibers in the proximal ends of cut dorsal root filaments at the L(4-6) level and tested for responses to acute cutaneous inflammation produced by intradermal injection of capsaicin. This antidromic activity included low-frequency spontaneous firing and dorsal root reflex (DRR) discharges evoked by applying von Frey hairs to the skin of the foot. DRRs could be recorded from both small myelinated (Adelta) and unmyelinated (C) afferent fibers, as well as from large myelinated (Abeta) fibers. After capsaicin was injected intradermally into the plantar skin of the foot, a significant enhancement of DRR activity was seen in Adelta and C fibers but not in Abeta fibers, and this increase lasted for approximately 1 h. This study supports the hypothesis that centrally mediated antidromic activity in Adelta and C primary afferent fibers contributes to the development of neurogenic inflammation, presumably by release of inflammatory substances in the periphery.     

Deficient expression of enhanced reactivation of parvovirus H-1 in ataxia telangiectasia cells irradiated with X-rays or u.v. light

Cells of patients with ataxia telangiectasia (AT), an inheriteddisease characterized by a high propensity to cancer, are hypersensitiveto ionizing radiation. We investigated whether the hyper-radiosensitivityof AT cells correlated with a defect in their constitutive and/orconditional ability to rescue a damaged exogenous virus. Forthat purpose, parvovirus H-1, a single-stranded DNA virus whoseintranuclear replication mostly relies on host cell functions,was used as a probe. The survival of u.v.-or -irradiated H-1was measured in X-, u.v.- or mock-irradiated human cells ofnormal (NB-E) or AT (AT5BIVA) origin. -irradiated H-1 survivedto similar extents in untreated normal and AT cell lines. BothX- and u.v.-irradiatlon induced normal cells to achieve an enhancedreactivation (ER) of -- or u.v.-damaged H-1. In contrast, neitherdose-effect curves nor time course revealed significant levelsof ER expression after X- or u.v.-irradiation in AT5BIVA cells.Our results suggest that the impairment of ER of damaged parvovirusesmay constitute a marker of the AT cell phenotype and be relatedto the radiosensitivity of AT cells.     

Radioprotective Effect of Whey Hydrolysate Peptides against γ-Radiation-Induced Oxidative Stress in BALB/c Mice

Radiation therapy is widely used in the treatment of tumor diseases, but it can also cause serious damage to the body, so it is necessary to find effective nutritional supplements. The main purpose of this study is to evaluate the protective effect of whey hydrolysate peptides (WHPs) against ⁶⁰Coγ radiation damage in mice and explore the mechanism. BALB/c mice were given WHPs by oral gavage administration for 14 days. Then, some mice underwent a 30-day survival test after 8 Gy radiation, and other mice received 3.5 Gy radiation to analyze the changes in body weight, hematology and bone marrow DNA after three and 14 days. In addition, through further analysis of the level of oxidative stress and intestinal barrier function, the possible mechanism of the radioprotective effect of WHPs was explored. The study found WHPs can prolong survival time, restore body weight, and increase the number of peripheral blood white blood cells and bone marrow DNA content in irradiated mice. In addition, WHPs can significantly improve the antioxidant capacity, inhibit pro-inflammatory cytokines and protect the intestinal barrier. These results indicate that WHPs have a certain radioprotective effect in mice, and the main mechanism is related to reducing oxidative damage.     

非开胸食管内翻剥脱术

目的　研讨非开胸食管内翻剥脱的手术方法、优缺点及适应症。方法 :分析我院 1 992年至 2 0 0 0年 6月非开胸食管内翻剥脱胃重建食管术的 1 8例病历 ,其中下咽癌 5例、甲状腺鳞癌 1例、喉癌侵犯下咽者 4例、食管颈段癌 8例。结果 :本组病人食管床出血量均在 1 0 0ml以下 ,无吻合口漏等严重并发症 ,无手术死亡。结论 :本手术安全具有简便创伤小的优点 ,适用于颈段食管癌、下咽癌及甲状腺癌和喉癌侵及下咽者、部分早期食管癌和贲门癌。     

多发伤的骨折内固定

目的：认识多发伤中骨折的主要特点,探讨内固定在救治中的意义。方法：回顾1994－08～1999－08间手术救治多发伤66例,对其161处骨折中的98处进行了“仿AO技术”有关方法内固定。结果：骨折均满意愈合;涉及骨折关节51个,功能恢复满意率为96．08％。结论：在多发伤中,骨折、合并伤与并发症远较“一般骨折”复杂、严重;有效固定骨折是一种重要的救命措施;内固定手术应争取在伤后24h进行,但如受条件制约,伤后1－3wk内手术也可获得满意效果;仿AO技术中的某些方法,如拉力螺钉、张力带钢丝及自动加压钢板等,用于内固定可使骨折获得卓有成效的稳定性。     

LT受体拮抗剂对大鼠肺纤维化LTB_4及血F_n的影响

45只大鼠随机分为 3组 ,对照组、模型组、治疗组各 15只。治疗组气管内单次灌注博莱霉素 (5 mg)后每日以安可来 (ACL,10 mg/ kg)灌胃 ;模型组气管内灌注同治疗组 ,灌胃以生理盐水代替。 3组动物在气管内灌注后分别于第 7、14、2 8d随机处死 5只 ,取左肺下叶 1g匀浆测 L TB4,心腔血测纤维联结蛋白 (Fn)。模型组和治疗组在气管内灌注后白三烯 B4(L TB4)迅速上升 ,第 7d达高峰 ,第 2 8d模型组 L TB4仍较高 ,治疗组 L TB4明显下降 ;Fn浓度模型组在第 7d明显升高 ,治疗组及对照组较低。结论 :在鼠实验性肺间质化过程中 L TB4明显增高 ,白三烯对肺间质纤维化的发生发展起一定作用     

^32P局部照射预防猪冠状动脉再狭窄研究

目的：评价^32P灌注球囊预防再狭窄的有效性、可行性和安全性。方法：对猪冠状动脉左前降支行过度球囊扩张术后,治疗组以^32P作血管内照射,对照组作假照射。术后35d收获目标血管、检测血管形态、细胞增殖百分比等。结果：治疗组血管腔面积较对照组明显增大（P＜0．01）,新生内膜面积、血管狭窄程度和各层PCNA阳性细胞明显减小（P均＜0．01）。结论：^31P灌注球囊照射预防冠状动脉再狭窄有效、安全而且可行。