N-cadherin、 β-连环素在肝癌组织中的表达及与Wnt信号途径的关系

目的 观察肝癌(HCC)中N-cadherin分子是否调控β-连环素(β-catenin)的表达及Wnt信号途径的活化。方法 免疫组织化学分析64例肝癌组织中N-cadherin及β-catenin的表达及相互关系。调控肝癌细胞株HCCLM3、SMMC-7721中N-cadherin表达并检测β-catenin的表达及Wnt信号途径的活化。结果 64例肝癌中,N-cadherin表达缺失34例;β-catenin在细胞膜上表达,无细胞核内聚集,且13例细胞膜表达缺失;细胞膜上β-catenin表达缺失与N-cadherin表达缺失呈正相关(P＜0.05)。下调HCCLM3细胞或上调SMMC-7721细胞中的N-cadherin表达导致细胞膜上β-catenin表达减弱或增强,但均未导致Wnt信号途径的活化。结论 在肝癌中,N-cadherin表达与细胞膜上β-catenin的表达水平呈正相关,但N-cadherin分子并不参与Wnt信号途径的调控。     

大鼠单侧睾丸损伤对对侧睾丸组织的影响及其机制的探讨

目的：研究大鼠单侧睾丸损伤后对侧睾丸组织变化及其发生机制。方法：选择SD雄性大鼠40只,随机分为4组：A组为对照组,B组为单侧睾丸挫伤组,c组为单侧睾丸裂伤组,D组为裂伤后腹腔注射环孢素A（cyclosporinA,CsA）组。分别于第2、4周观察大鼠后足垫反应（footpadreaction,FPR）,取对侧睾丸做苏木精一伊红（HE）染色和免疫组化检测CD4分子、CD8分子的表达。结果：注射睾丸抗原48h后,B、C组大鼠右足足垫较A、D组显著增厚（P〈0．01）,C组与B组差异亦有显著统计学意义（P〈0．05）,A组与D组差异无统计学意义（P〉0．05）。B、C组对侧睾丸组织学发生明显改变,A、D组改变不明显。B、C组中CU’T细胞平均光密度（oD）值高于CD。’T细胞（P〈0．05）,两种T细胞OD值均明显高于对照组（P〈0．01）,C组与B组比较,CD4＋T细胞OD值差异有统计学意义（P〈O．05）,CD4＋T细胞OD值差异无统计学意义（P〉0．05）。各组结果在第2、4周比较,差异均无统计学意义。结论：单侧睾丸损伤可引起对侧睾丸组织发生迟发型超敏反应（delayedtypehypersensitivity,DTH）,主要由CD4＋T细胞介导,且与睾丸损伤程度有关。CsA可抑制DTH的发生。     

Comparison between radial head replacement and open reduction and internal fixation in clinical treatment of unstable, multi-fragmented radial head fractures

The objective of this study was to compare replacement of the radial head by metal prostheses with open reduction and internal fixation (ORIF) for the treatment of unstable, multi-fragmented radial head fractures. A prospective randomised controlled trial was employed to investigate 45 patients with unstable, multi-fragmented fractures of the radial head, from January 2004 to June 2007. The patients were randomised to two groups: the ORIF group and the radial head replacement group. Over the next two years, follow-up assessments recorded Broberg and Morrey scores and postoperative complication rate. Statistical analysis was performed. According to Broberg and Morrey scores, patients receiving radial head replacement achieved significantly better clinical results with 91% (20/22) good or excellent compared to patients assigned to the ORIF group with 65.2% (15/23) good or excellent results (P < 0.01). Postoperative complication rate of the radial head replacement group (13.6%) was significantly lower than that of the ORIF group (47.9%; P < 0.01). Compared with open reduction and internal fixation, radial head replacement with a metal prostheses resulted in favourable joint function for the unstable, multi-fragmented fractures of the radial head.     

非洛地平缓释剂治疗肾移植术后高血压患者的中远期疗效观察(附37例报告)

目的 研究非洛地平缓释剂治疗肾移植术后高血压患者的中远期疗效与安全性.方法 74例肾移植患者随机分为非洛地平缓释剂治疗组(研究组)和硝苯地平对照组(对照组)各37例.研究组给予口服非洛地平缓释剂,起始剂量为每次2.5 mg,每日1次;对照组给予口服硝苯地平,起始剂量为每次10 mg,每日3次.根据血压控制情况调整两组的...     

经闭孔行闭孔神经阻滞对预防膀胱侧壁肿瘤电切时闭孔神经反射的作用

目的探讨经闭孔行闭孔神经阻滞对预防膀胱侧壁肿瘤电切时闭孔神经反射的作用。方法回顾性分析67例膀胱侧壁浅表性肿瘤行经尿道膀胱肿瘤电切术的患者资料,根据术中是否行闭孔神经阻滞分为闭孔神经阻滞组（35例）和对照组（32例）,其中闭孔神经阻滞组术中辅以经闭孔法闭孔神经阻滞,而对照组未行闭孔神经阻滞。比较两组术中闭孔神经反射发生率、膀胱穿孔率、手术时间、及出血量,并术后随访观察肿瘤的复发情况。结果两组术中电切时间、出血量、术后1年肿瘤复发率均无统计学差异,但闭孔神经阻滞组闭孔神经反射率及膀胱穿孔率较对照组明显降低。结论经闭孔行闭孔神经阻滞能有效预防膀胱侧壁肿瘤电切时闭孔神经反射,可降低膀胱穿孔率,其操作要点是选择准确的穿刺点、掌握好穿刺方向和深度。     

广州天河社区绝经后妇女血清25羟维生素D水平与骨密度的相关性分析

目的调查广州天河区绝经后妇女维生素D水平及其与骨密度的关系。方法随机选取2015年4月至2015年8月在广州市天河区前进街社区卫生服务中心体检的109名绝经后妇女,年龄49~75岁。检测血清25(OH)D水平,分析血清25(OH)D水平与骨转换指标和骨密度(BMD)的相关性。结果 25.7%的受试者血清25(OH)D水平≥75 nmol/L,41.3%在50~75 nmol/L之间,33.0%低于50 nmol/L。双变量分析显示血清25(OH)D水平与血清PINP、β-CTX水平无相关性。股骨颈BMD与血清25(OH)D正相关(r=0.373,P=0.030),校正年龄和体重指数(BMI)后,相关性仍存在(r=0.174,P=0.049)。多元回归分析显示年龄、BMI、25(OH)D是股骨颈BMD的预测因子(R2=0.325)。结论绝经后女性广泛存在血清25(OH)D不足或缺乏,血清25(OH)D水平与股骨颈BMD正相关,适当补充维生素D对维持股骨颈区域的骨量至关重要。     

模拟飞行缺氧与吸氧对小鼠脏器自由基代谢的影响

目的 观察了两种模拟飞行条件（１５００ｍ轻度低压缺氧和５５００ｍ中度低压吸氧重复暴露下小鼠多脏器自由基代谢变化的特点。方法 昆明种小鼠６０只,随机分为６组（ｎ＝１０）进行缺氧与吸氧实验,实验完毕后,取小鼠尾血做血常规检查。次日,将小鼠断头处死,取脑、心、肺、肝、肾制备匀浆,测定丙二醛（ＭＤＡ）含量和超氧化物歧化酶（ＳＯＤ）活性。结果 １５００ｍ轻度低压缺氧重复暴露８ｗｋ使肺ＭＤＡ含量显著增高,提示     

离心机训练矫治+Gz耐力不良的高性能战斗机飞行员

目的 矫治两名＋Ｇｚ耐力不良的高性能战斗机飞行员。方法在离心机上高＋ＧＺ负荷下训练抗荷动作（ＡＧＳＭ）和加压呼吸（ＰＢＧ）动作。结果 ＡＧＳＭ的抗荷效果提高３．０－３．２５Ｇ,加压呼吸了系统的抗荷效果提高２．７５－３．０Ｇ,综合耐力比基础耐力高４．２５－４．５Ｇ,两人均顺利通过８Ｇ１０Ｓ的ＳＡＣＭ＋ＧＺ曲线,达到训练标准。     

人结肠癌裸鼠移植瘤热疗和化疗及放疗后凋亡相关基因的变化

目的探讨热疗、化疗、放疗对人结肠癌裸鼠移植瘤凋亡相关基因表达的影响。方法将人类结肠癌细胞株——HT29移植于裸鼠双侧后肢。于实验室模拟热疗条件（43℃，60rain），并参照人类结肠癌临床化疗及放疗方案。实验共分6组，即热疗、化疗、放疗、热化疗、热放疗及热放化疗组。于治疗前后不同时间点处死裸鼠。取肿瘤组织备用。利用免疫组织化学染色检测肿瘤细胞膜、细胞浆及细胞核Bcl－2和Bax基因及P53表达的形态学变化。结果6种治疗方法均能不同程度下调P53和Bcl－2、上调Bax的表达。热放化疗组治疗后48hP53及Bcl－2达到最低水平，Bax达高峰。与另外5组比较差异有统计学意义（P〈0．01）；热疗、热化疗及热放疗3组间对P53表达的下调作用差异无统计学意义，但均较化疗、放疗组下调明显。治疗后48h热放疗组和热放化疗组Bcl－2的表达明显低于其他各组（P〈0．05），热疗组下调Bcl－2作用最小，与另外5组的差异均有统计学意义（P〈0．05和P〈0．01）。热放化疗组上调Bax基因表达的作用发生时间最早（2h）：作用最强，与另外5组的差异均有统计学意义（P〈0．05和P〈0．01）；热疗组发生时间最晚（24h），作用最小，与另外5组的差异均有统计学意义（P〈0．05和P〈0．01）。结论热疗可能通过增强放化疗对凋亡相关基因的表达发挥其增敏作用。热疗联合应用化疗和（或）放疗对人结肠癌裸鼠移植瘤凋亡相关基因表达的改变更为显著。     

Treatment of osteonecrosis of femoral head with BMSCs-seeded bio-derived bone materials combined with rhBMP-2 in rabbits

Objective： To evaluate the effect of autologous bone marrow mesenchymal stem cells （BMSCs） seeded bio-derived bone materials （BBM） combined with recombinant human bone morphogenetic protein-2 （rhBMP-2） in repairing defect of osteonecrosis of femoral head （ONFH）.
Methods： Early-stage osteonecrosis in the left hip was induced in 36 adult New Zealand white rabbits （provided by the Animal Center of Guangxi Medical University, Nanning, China） after core decompression and delivery of liquid nitrogen into the femoral head. Then the animals were divided into three groups according to the type of implants for bone repair： 12 rabbits with nothing （Group Ⅰ, the blank control group）, 12 with BBM combined with rhBMP-2 （Group Ⅱ）, and 12 with BMSCs-seeded BBM combined with rhBMP-2 （Group Ⅲ）. At 4, 8, and 12 weeks after surgery, X-ray of the femoral head of every 4 rabbits in each group was taken, and then they were killed and the femoral heads were collected at each time point, respectively. Gross observation was made on the femoral heads. After hematoxylin and eosin staining, Lane-sandhu scores of X-ray and bone densitometry were calculated and the histomorphometric measurements were made for the new bone trabeculae.
Results： At 12 weeks after surgery, two femoral heads collapsed in Group Ⅰ, but none in Group Ⅱ or Group Ⅲ. X-ray examination showed that the femoral heads in Group I had defect shadow or collapsed while those in Group II had a low density and those in Group III presented with a normal density. Histologically, the defects of femoral heads were primarily filled with no new bone but fibrous tissues in Group Ⅰ. In contrast, new bone regeneration and fibrous tissues occurred in Group II and only new bone regeneration occurrd in Group Ⅲ. Lane-sandhu scores of X-ray, bone mineral density and rate of new bone in trabecular area in Group Ⅲ were higher significantly than those of the other two groups. Conclusions： Our findings indicate a superior choice of