重组腺病毒Ad-HGF抑制博来霉素致大鼠肺纤维化的作用

目的:观察携带肝细胞生长因子基因的重组腺病毒(Ad-HGF)对博莱霉素(BLM)致大鼠肺纤维化的抑制作用,为基因防治肺纤维化探索有效途径. 方法: BLM气管内滴注0.5 mL(2 mg)制作大鼠肺损伤模型60只,分为Ad-HGF治疗组(A组)、Ad-GFP治疗组(B组)和模型对照组(C组),各20只. 造模次日A组给予1×109 pfu Ad-HGF,B组给予1×109 pfu Ad-GFP,C组给予0.5 mL生理盐水灌注治疗;于14 d处死动物,检测肺组织匀浆中羟脯氨酸含量;做石蜡切片,用1 g/L苦味酸天狼猩红染色,偏振光显微镜观察胶原及其类型,并对切片中I型胶原进行半定量评估. 结果: Ad-HGF组羟脯氨酸含量(1.91±0.16) mg/g较Ad-GFP组(3.27±0.43) mg/g和模型对照组(3.04±0.26) mg/g低(P<0. 05);肺组织切片中的I型胶原Ad-HGF组(2.12±0.61)明显较Ad-GFP组(3.17±0.56)和模型对照组(3.38±0.66)稀少(P<0.05). 结论: 重组腺病毒Ad-HGF对肺损伤后纤维化有抑制作用.     

CD44V6，HIF-1α，VEGF与非小细胞肺癌侵袭和转移的关系

目的 探讨CD44V6、HIF-1α、VEGF在非小细胞肺癌(NSCLC)中的表达与非小细胞肺癌侵袭和转移的关系.方法 通过免疫组化的方法(SP法)测定粘附分子 (CD44V6 )、血管内皮细胞生长因子(VEGF)和缺氧诱导因子(HIF-1α)在非小细胞肺癌组织中的表达情况.结果 CD44V6 、HIF-1α和VEGF在NSCLC组织中阳性表达率分别为85.07%、61.19%和74.63%;CD44V6 、HIF-1α、VEGF蛋白表达与肿块大小、病理类型、组织分程度、淋巴结转移、临床分期密切相关,并且在非小细胞肺癌中的表达相互之间存在相关性;这3种蛋白的共表达与淋巴结转移、临床分期相关.结论 CD44V6 、HIF-1α和VEGF在NSCLC中的阳性表达与NSCLC的侵袭和转移密切相关.     

血管紧张素Ⅱ对成人脂肪间充质干细胞向心肌细胞分化的影响

目的:观察血管紧张素Ⅱ(AngⅡ)对成人脂肪间充质干细胞(ADMSCs)向心肌细胞方向分化的诱导作用,并与5-氮杂胞苷(5-aza)作比较.方法:自成人脂肪组织中分离培养ADMSCs,分别用Ang Ⅱ(Ⅰ组)和5-aza(Ⅱ组)诱导ADM-SCs,同时设立对照组(Ⅲ组),光镜下观察细胞的生长情况及形态学变化,电镜下观察细胞的超微结构,免疫细胞化学方法检测心肌特异性肌钙蛋白-Ⅰ(cTn-Ⅰ),MTT法检测细胞活性,流式细胞术分析细胞周期及凋亡.结果:Ⅰ,Ⅱ组ADM-SCs诱导后呈现类似心肌细胞的形态学特征,第28日Ⅰ,Ⅱ组均表达cTn-Ⅰ,两组间诱导转化率无差别,其中Ⅰ组ADM-SCs增殖迅速,较少凋亡细胞.结论:AngⅡ在促进ADMSCs增殖的同时诱导其向心肌细胞分化,优于传统的化学诱导剂5-aza.     

CD_(44)v_6与肿瘤侵袭和转移研究进展

CD44是由单一基因所编码的具有高度异质性的单链膜表面糖蛋白家族,介导细胞与细胞、细胞与细胞外基质之间的黏附作用,其拼接变异体的不同构成了其基因产物的多样性;尤其拼接变异体V6(CD44v6)被认为具有致瘤性;CD44v6在一定程度上参与了肿瘤的发生发展,是预后因子之一,并且可能作为肿瘤进展的标志物。CD44v6的过表达与肿瘤的侵袭、转移和临床分期有关。对CD44v6的检测不仅能预测患者的预后,而且还可为肿瘤的个体化治疗直接提供信息。     

247. H?modynamische Charakteristika der akut nekrotisierenden Pankreatitis

Zusammenfassung Bei 23 Patienten mit nekrotisierender Pankreatitis wurden hämodynamische Messungen mit einem Swan-Ganz-Katheter vorgenommen. Der mittlere arterielle Druck war signifikant erniedrigt, die Herzfrequenz dagegen erhöht. Charakteristisch war für alle Patienten ein niedriger peripherer Gefäßwiderstand und ein erhöhtes Herz-Zeit-Volumen sowie ein erhöhter Kardiac-Index. Patienten mit nekrotisierender Pankreatitis haben also einen hyperdynamischen Schockzustand, wie er auch im septischen Schock beobachtet wird.     

两种不同基质环丙沙星栓在家兔体内的药物动力学研究

研制了两种不同基质的环内沙星栓剂，并对其在家兔体内的药物动力学与市售片剂进行了比较。实验表明，两种栓剂的Ｃ＿（ＰＫ），ＡＵＣ值等均明显高于片剂（ｐ＜０．００１），预示可以通过改变给药途径提高环丙沙星的生物利用度。     

Transferrin saturation, plasma iron turnover, and transferrin uptake in normal humans

The relationship between plasma iron, transferrin saturation, and plasma iron turnover was studied in 53 normal subjects whose transferrin saturation varied between 17% and 57%, in 25 normal subjects whose transferrin saturation was increased by iron infusion to between 67% and 100%, and in five subjects with early untreated idiopathic hemochromatosis whose transferrin saturation was continually elevated to between 61% and 86%. The plasma iron turnover of all of these subjects ranged from 0.45 to 1.22 mg/dL whole blood/d. The mean values for the above-mentioned three groups were 0.71 +/- 0.17, 1.01 +/- 0.11, and 1.01 +/- 0.13 mg/dL whole blood/d, respectively. Most of this variation, estimated at 72% by regression analysis, was due to a direct relationship between transferrin saturation and plasma iron turnover. This effect was attributed to a competitive advantage of diferric over monoferric transferrin in delivering iron to tissues. This was confirmed by the demonstration of a more rapid clearance of diferric as compared to monoferric transferrin in an additional group of eight normal subjects. Calculations were made of the amount of transferrin reacting with membrane receptors per unit time. Allowance was made for the noncellular (extravascular) exchange and for the 4.2:1 preference of diferric over monoferric transferrin demonstrated in vitro. The amount of iron-bearing transferrin leaving the plasma to bind to tissue receptors for 53 subjects with a transferrin saturation between 17% and 57% was 71 +/- 13; for 25 subjects with a saturation from 67% to 100%, 72 +/- 12; and for five subjects with early idiopathic hemochromatosis, 82 +/- 11 mumol/L whole blood/d. There were no significant differences among these groups. These studies indicate that while the number of iron atoms delivered to the tissues increases with increasing plasma iron and transferrin saturation, the number of iron-bearing transferrin molecules that leave the plasma per unit time to bind to tissue receptors is relatively constant and within the limits studied, independent of transferrin saturation.