论著

兔VX2移植瘤内间质液压的分布异质性

Heterogeneity of interstitial fluid pressure distribution in VX2 xenografts of rabbits

:26-31
 
目的 探索实体肿瘤内部不同区域的间质液压(IFP)分布的异质性。方法 通过建立新西兰大白兔的皮下浅肌层VX2移植瘤模型,通过超声造影观察肿瘤的大小、形状、血流灌注等成瘤情况,并在超声引导下通过针芯法(WIN法)测量41只荷瘤兔VX2移植瘤内部不同区域的IFP。结果 41只荷瘤兔的VX2移植瘤的中央IFP为(23.79±8.07) mmHg、肿瘤外周1/2IFP为(15.58±5.22)mmHg、肿瘤外周1/4IFP为(8.29±5.47)mmHg,IFP从中央到外周逐步降低(F=70.85,P<0.001)。结论 VX2移植瘤内不同区域的IFP存在异质性,即从中央到外周IFP呈梯度显著降低。
Objective To explore the heterogeneity of interstitial fluid pressure(IFP)distribution in different regions of solid tumors.Methods The model of VX2 tumor was established in New Zealand white rabbits.The size,shape and blood perfusion of the tumor were observed by contrast-enhanced ultrasound,the IFP of VX2 tumor in 41 rabbits was measured by the wick-in-needle method(WIN method)under the guidance of ultrasound.Results The mean values of central IFP,peripheral 1/2 IFP and peripheral 1/4 IFP were(23.79±8.07) mmHg,(15.58±5.22 )mmHg and (8.29±5.47) mmHg,respectively by statistical analysis,the IFP values changed significantly with different regions(F=70.85,P<0.001).Conclusions There is heterogeneity of IFP in different regions of VX2 xenografts,that is,from the center to the periphery,the IFP decreased significantly.
临床诊疗

细胞间质液压升高对肝星状细胞的影响

Influence of interstitial cell fluid pressure rising to hepatic stellate cell

:130-134
 
目的 从生物力学应力调控角度,探讨组织间质液压升高诱发肝纤维化的分子细胞机制。方法 人肝星状细胞随机分为3组,模型组:将其置于压力箱中施加恒定的高于大气压50 mmHg压力;实验组:加入ROCK抑制剂Y-27632(浓度10 μmol)置于与实验组相同条件;对照组:不加压置于相同培养箱中。应用RC-PCR检测其α-SMA、RhoA、ROCK mRNA的表达量,并应用免疫荧光染色分析其α-SMA、ROCK1、ROCK2蛋白表达情况。结果 间质液压变化对人肝星状细胞中α-SMAmRNA的表达量比对照组表达量增加,RhoA mRNA的表达先上升后下降,只对早期压力有变化,而 ROCK mRNA的表达量无明显变化。抑制剂组和压力组α-SMA 、ROCK1荧光强度较对照组增强,ROCK2荧光强度无明显变化,其中模型变化更显著。结论 细胞间质液压升高能通过RhoA/ROCK1信号通路引起肝星状细胞的活化。
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