The expression and significance of the multidrug resistance-related proteins P-gp, MRP and LRP in human non-small cell lung cancer tissues

Objective: To explore the expression and significance of the multidrug resistance-related proteins P-glycopro-tein (P-gp), multidrug resistance-related protein (MRP), lung resistance protein (LRP) in human non-small cell lung cancer (NSCLC) tissues and paratumor tissues. Methods: Immunohistochemistry (IHC) was used to examine the expression level of proteins P-gp, MRP and LRP in 43 samples of NSCLC and 15 samples of paratumor tissues. Results: The expression rates of P-gp, MRP and LRP in 43 tumor tissues were 74.42% (32/43), 67.44% (29/43) and 88.37% (38/43), respectively, while in 15 paratumor tissues were 13.33% (2/15), 20.00% (3/15) and 6.67% (1/15), respectively. There was significant difference in the expression of proteins (P-gp, MRP and LRP) between lung cancer tissues and paratumor tissues (P < 0.05). The expres-sion of proteins P-gp, LRP in lung adenocarcinoma were higher than that in other pathological carcinomas (P < 0.05). The expression of protein MRP was not related to pathological type, clinical stage and classification of histodifferentiation (P > 0.05). Conclusion: Multidrug resistance is more common in NSCLC. The proteins of P-gp, MRP and LRP participated in the formation of multidrug resistance in lung cancer. Detection of multidrug resistance-related proteins in lung cancer tissues may be useful to choice drugs.

Expression of lung resistance protein in patients with gastric carcinoma and its clinical significance

INTRODUCTION The efficacy of chemotherapy in the treatment of cance patients is often hampered by the presence or appearance of multidrug resistance(MDR) of tumor cells.

Relationship between Methylation Status of Multi-drug Resistance Protein(MRP) and Multi-drug Resistance in Lung Cancer Cell Lines

Objective： To study the relationship between the methylation status of multi-drug resistance protein （MRP） gene and the expression of its mRNA and protein in lung cancer cell lines. Methods： Human embryo lung cell line WI-38, lung adenocarcinoma cell line SPCA-1 and its drug-resistant cells induced by different concentrations of doxorubicin were treated with restriction endonuclease Eco47III. The methylation status of MRP was examined by PCR, and the expressions of its mRNA and protein were evaluated by in situ hybridization and immunohistochemistry. Results： MRP gene promoter region of WI-38 cells was in hypermethylation status, but the promoter region of MRP in SPCA-1 cells and their resistant derivatives induced by different concentrations of doxorubicin were in hypomethylation status. There were significant differences in the expression of MRP mRNA among WI-38 cell line, SPCA-1 cells and their drug-resistant derivatives induced by different concentration of doxorubicin. Consistently, MRP immunostaining presented similar significant differences. Conclusion： The promoter region of MRP in SPCA-1 lung adenocarcinoma cells was in hypomethylation status. The hypomethylation status of 5＇ regulatory region of MRP promoter is an important structural basis that can increase the activity of transcription and results in the development of drug resistance in lung cancer.

Differential expression of breast cancer-resistance protein,lung resistance protein,and multidrug resistance protein 1 in retinas of streptozotocin-induced diabetic mice

AIM：To investigate the altering expression profiles of efflux transporters such as breast cancer-resistance protein（BCRP）,lung resistance protein（LRP）,and multidrug resistance protein 1（MDR1） at the inner blood-retinal barrier（BRB） during the development of early diabetic retinopathy（DR） and/or aging in mice.METHODS：Relative m RNA and protein expression profiles of these three efflux transporters in the retina during the development of early DR and/or aging in mice were examined.The differing expression profiles of Zonula occludens 1（ ZO-1） and vascular endothelial growth factor-A（ VEGFA） in the retina as well as the perfusion characterization of fluorescein isothiocyanate（FITC）-dextran and Evans blue were examined to evaluate the integrity of the inner BRB.RESULTS：There were significant alterations in these three efflux transporters＇ expression profiles in the m RNA and protein levels of the retina during the development of diabetes mellitus and/or aging.The development of early DR was confirmed by the expression profiles of ZO-1 and VEGFA in the retina as well as the compromised integrity of the inner BRB.CONCLUSION：The expression profiles of some efflux transporters such as BCRP,LRP,and MDR1 in mice retina during diabetic and/or aging conditions are tested,and the attenuated expression of BCRP,LRP,and MDR1 along with the breakdown of the inner BRB is found,which may be linked to the pathogenesis of early DR.

EXPRESSION OF MULTIDRUG RESISTANCE-ASSOCIATED PROTEIN (MRP) AND ITS RELATIONSHIP WITH CLINICOPATHOLOGICAL FACTORS IN NON-SMALL CELL LUNG CANCER

Objective: To investigate the relationship between the expression of multidrug resistance-associated protein (MRP) and clinicopathological factors and prognosis. Methods: The expression of MRP in 62 cases with non-small cell lung cancer (NSCLC) was detected using immunohistochemistry method. The expression of MRP in 30 cases of NSCLC and corresponding normal lung tissues were detected using immunohistochemistry and Western Blot. Results: this study of tumor tissues confirmed the plasma membrane and/or cytoplasm locations of MRP. There was apparent difference between normal lung tissues and NSCLC in MRP. The survival analysis of 62 NSCLC showed that the mean survival time of the patients with negative MRP expression was 69.8117.41 months and that of patients with positive MRP expression, 25.384.46 months. Log-rank test suggested that the difference between them was significant (P=0.0156). It was also found that in squamous cell lung cancer the statistically significant difference between the mean survival time of patients with positive MRP expression and those with negative MRP expression (P=0.0153). Multivariate Cox model analysis suggested that the survival time was significantly related to expression of MRP (P=0.035) and lymphatic metastasis (P=0.038). Conclusion: MRP expression in NSCLC is significantly higher compared with normal lung tissues. The mean survival time of patients with negative MRP was relative longer and expression of MRP was an independent factor for prognosis.

Expression of multidrug-resistance associated proteins in human retinoblastoma treated by primary enucleation

AIM： To reveal the expression of multidrug-resistance associated proteins： glutathione-S-transferase π（GSTπ）, P-glycoprotein（P-gp） and vault protein lung resistance protein（LRP） in retinoblastoma（RB） without any conservative treatment before primary enucleation and to correlate this expression with histopathological tumor features. METHODS： A total of 42 specimens of RB undergone primary enucleation were selected for the research. Sections from the formalin-fixed, paraffin-embedded specimens were stained with HE and immunohistochemistry to detect the expression of GSTπ, P-gp and LRP.RESULTS： GSTπ was expressed in 39/42（92.86%） RBs and in 9/9（100%） well-differentiated RBs. P-gp/GSTπ was found in 30（71.42%） of 42 RBs. Totally 9（21.43%） tumors were well differentiated and 33（78.57%） were poorly differentiated. Totally 15（35.71%） eyes had optic nerve（ON） tumor invasion, 36（85.71%） had choroidal tumor invasion, and 14（33.33%） had simultaneous choroidal and ON invasion. There was no statistically significant relationship between P-gp, GSTπ, LRP positivity and the degree of ocular layer tumor invasion and ON tumor invasion（P〉0.05）. CONCLUSION： RB intrinsically expresses GSTπ, P-gp and LRP. GSTπ expression is positive in 100% welldifferentiation ones, so in which way it is correlated with differentiation. But the other two proteins expressions are not related to tumor differentiation and to the degree of tumor invasion. GSTπ may be a new target of chemotherapy in RB.

Effects of arsenic trioxide on drug transporting molecules in multidrug resistance malignant neoplasma MR2 cell line

Objective： To study the effect of arsenic trioxide （As203） on the expression of drug transporting molecules in multidrug resistance malignant neoplasma acute promyelocytic leukemia （APL） MR2 cell line. Methods： MR2 resistant to alltrans retinoic acid （ATRA） and non-ATRA resistant APL cell line NB4 were used. Expressions of P-glycoprotein （Pgp）, multidrug resistance protein （MRP） and lung resistance-related protein （LRP） were detected by immunocytochemical assay. Results： The expression of Pgp was significantly higher in MR2（30%-40%） than that in NB4（10%-20%） （P 〈 0.001）, and the expression of MRP was also higher in MR2 （56.9 ± 3.4 - 21.2 ± 1.1） than that in NB4 （20.6 ± 5.3 - 16.7 ± 1.2） （P 〈 0.001）. As2O3 ranging from 0.5-2.0 μmol/L, could significantly decrease the expressions of Pgp and MRP. The expression of Pgp and MRP in MR.2 cell line were negatively correlated with the dose and duration of action of As2O3. Conclusion： Pgp and MRP may be the sensitive targets of As2O3 to overcome drug-resistance. ATRA might be the substrates of Pgp and MRP.

肺耐药蛋白LRP在肺癌中的表达及意义

目的:检测LRP在不同分化阶段肺癌组织中的表达,探讨肺癌分化与LRP之间的关联;干扰LRP后,观察其对肺癌细胞A549侵袭能力的影响及其可能的分子机制。方法:应用免疫荧光检测肺癌组织中LRP蛋白及表达分布,Western blot检测肺癌组织及癌旁组织中LRP蛋白表达。通过RNAi技术干扰LRP后,运用RT-PCR、Western blot技术,观察干扰LRP基因效率,检测LRP在A549细胞的表达及对细胞侵袭能力的影响;同时用Western blot方法检测ERK及AKT信号通路、MMP金属蛋白酶及凋亡蛋白的表达。结果:肺癌中LRP阳性率与组织学分级相关,在低分化、中分化、高分化肺癌组织及癌旁组织中表达率分别为60.6%、39.3%、18.3%、8.3%,肺癌组织中LRP蛋白表达量明显高于癌旁组织。LRP-siRNA转染组侵袭率为(60.4±6.4)%高于对照组的(50.5±4.4)%,差异显著(P<0.05)。LRP-siRNA转染组AKT和ERK1/2磷酸化水平明显下降;MMP-2和MMP-9蛋白的表达水平受到抑制;凋亡相关蛋白Bcl-2降低,Bax升高。结论:LRP表达与肺癌的组织学分级有关,LRP蛋白有可能是肺癌浸润和转移的一个重要参考指标,可为肺癌治疗提供潜在的靶点。

GST-π、ERCC1、MRP和LRP在卵巢癌组织中的表达及意义

目的探讨谷胱甘肽S-转移酶π(GST-π)、切除修复交叉互补基因(ERCC1)、多药耐药相关蛋白(MRP)及肺耐药相关蛋白(LRP)在上皮性卵巢癌组织中的表达及临床意义。方法采用免疫组织化学技术检测67例卵巢恶性肿瘤、20例卵巢良性肿瘤和16例正常卵巢组织中GST-π、ERCC1、MRP及LRP的表达状况,并对相关的临床病理因素进行分析。结果①67例卵巢癌中,GST-π、MRP和LRP阳性表达均显著高于其在卵巢良性肿瘤和正常卵巢组织中的阳性表达(P<0.05),而ERCC1的阳性表达同卵巢良性肿瘤和正常卵巢组织比较差异无统计学意义(P>0.05)。②GST-π的表达与肿瘤分化程度有关,分化越低表达越高(P<0.05);而ERCC1、MRP和LRP的阳性表达与多种临床病理因素无关(P>0.05)。结论 GST-π、ERCC1、MRP及LRP蛋白在卵巢癌的发生发展及耐药机制中发挥重要作用,联合检测对卵巢癌治疗方案的合理制定及化疗反应性的评估具有积极的临床指导意义。

耐药相关基因MDR1、MRP、LRP及其表达产物P-gp、MRP、LRP在非小细胞肺癌组织中的表达及意义

目的:研究探讨非小细胞肺癌(NSCLC)组织和癌旁组织中多药耐药基因1(multidrug resistance gene1,MDR1)、多药耐药相关蛋白(multidrug resistance-related proteins,MRP)、肺耐药蛋白(lung resistance protein,LRP)mRNA及其相应蛋白P-gp、MRP、LRP的表达情况及临床意义。方法:运用聚合酶链反应(RT-PCR)、免疫组织化学法(IHC)检测43例NSCLC组织及癌旁组织标本中耐药基因MDR1、MRP、LRPmRNA及其蛋白P-gp、MRP、LRP的表达水平。结果:MDR1、MRP和LRP mRNA3种基因在43例肿瘤组织中的表达率分别为79.06%(34/43)、65.17%(28/43)和86.05%(37/43),癌旁组织中的表达率分别为20.00%(3/15)、13.33%(2/15)和13.33%(2/15);P-gp、MRP和LRP3种耐药蛋白在肺癌组织中的表达率分别为74.42%(32/43)、67.44%(29/43)和88.37%(38/43),癌旁组织中的表达率分别为13.33%(2/15)、20.00%(3/15)和6.67%(1/15),上述3种基因及其蛋白在肺癌组织与癌旁组织的表达差异有显著性(P<0.05)。肺癌组织中既存在耐药基因MDR1、MRP和LRP的共表达,也存在耐药蛋白P-gp、MRP和LRP的共表达,3种基因与其相应蛋白表达密切相关。肺腺癌组织中MDR1及其蛋白P-gp、LRPmRNA表达率较高,与其它病理类型相比差异有显著性(P<0.05),MRPmRNA及其蛋白MRP表达与肺癌病理类型、临床分期和组织学分级无关(P>0.05)。结论:NSCLC存在着广泛的原发性多药耐药现象,耐药基因MDR1、MRP和LRPmRNA及其相应蛋白参与了肺癌多药耐药的形成,检测多药耐药基因可为指导临床用药提供一定的理论依据及策略。

耐顺铂相关基因MDR1、MRP、LRP及GST-π在非小细胞肺癌中的表达及与生存相关的Meta分析

目的:采用循证医学系统分析方法了解肿瘤耐顺铂相关基因与非小细胞肺癌的相关性,为科学制定化疗方案提供理论依据。方法:检索中国学术期刊网(CNKI)全文数据库、维普科技期刊、美国国立图书馆PUBMED;检索时间段为1979-2011年;获得符合纳入标准的关于非小细胞肺癌耐药相关基因MDR1、MRP、LRP及GST-π的文献研究27篇;采用Stata11.0进行统计分析。结果:非小细胞肺癌组织与正常肺组织耐药基因表达合并效应显示,非小细胞肺癌组织耐顺铂相关基因表达水平明显高于正常肺组织。4种基因合并OR值并计算95%可信区间,各基因表达结果按照OR值大小顺序,OR值及95%可信区间依次为GST-π30.86(16.03,59.40)、LRP 13.96(9.27,21.01)、MRP 12.69(8.36,19.26)、MDR1 8.03(4.45,14.48),其中LRP及MRP基因3年死亡人数明显高于3年生存人数,OR值及9 5%可信区间分别为LRP 4.75(2.11,10.67)、MRP 4.61(2.28,9.32)。结论:耐顺铂相关基因MRP、LRP、GST-π及MDR1在非小细胞肺癌组织中呈高表达,尤以GST-π基因为著,其余依次是LRP、MRP、MDR1基因。各基因在非小细胞肺癌组织中表达的高低直接影响化疗效果和预后,是非小细胞肺癌化疗耐药中的重要基因。

MRP、GST-π、TopoⅡα和LRP在胃癌组织中的表达及意义

背景与目的:多药耐药相关蛋白(multidrugresistance-associatedprotein,MRP)、肺耐药蛋白(lungresistanceprotein,LRP)、谷胱甘肽转移酶(glutathione-S-transferase-π,GST-π)和拓扑异构酶Ⅱα(topoisomeraseⅡα,TopoⅡα)均在多药耐药中发挥重要作用。联合检测它们在胃癌组织中的表达,目前国内外报道极少。本研究旨在探讨联合检测MRP、GST-π、TopoⅡα、LRP在胃癌组织中的表达及意义。方法:应用免疫组化SP法检测MRP、GST-π、TopoⅡα、LRP在90例胃癌标本中的表达,采用χ2检验和Fisher精确检验分析它们表达的意义。结果:(1)MRP、GST-π、TopoⅡα、LRP在胃癌组织中的阳性表达率分别为88.9%、91.1%、74.4%和87.7%,均高于在正常胃粘膜组织中的表达(P<0.05)。(2)MRP、GST-π、LRP在高、中分化腺癌中的表达均高于低分化腺癌,而TopoⅡα在高、中分化腺癌中的表达低于低分化腺癌(P<0.05);此四者的表达情况在不同浸润程度及有/无淋巴结转移的胃癌组织之间均无统计学差异(P>0.05)。(3)MRP、GST-π、TopoⅡα、LRP两两间均无相关性。结论:MRP、GST-π、TopoⅡα和LRP均在胃癌原发性多药耐药中起重要作用,它们在胃癌组织中的表达与肿瘤分化程度有关,而与肿瘤浸润程度及是否有淋巴结转移无关。

EGFR和LRP表达与卵巢癌化疗耐药及预后的关系

背景与目的:表皮生长因子受体(epidermal growth factor receptor,EGFR)的异常表达和活化能引起肿瘤细胞化疗耐药的产生,与卵巢癌化疗后复发及预后密切相关。肺耐药蛋白(lung resistance protein,LRP)是一种主要介导铂类等化疗药物耐药的多药耐药蛋白。研究表明,LRP是预测卵巢癌化疗敏感的独立预后因素。本研究探讨EGFR和LRP表达与卵巢癌化疗耐药及预后的关系。方法:采用免疫组化PV-6000二步法,检测76例恶性卵巢肿瘤、9例卵巢交界性肿瘤、17例卵巢良性肿瘤和15例卵巢正常组织中EGFR和LRP的表达,分析EGFR和LRP表达与卵巢癌化疗疗效及患者术后生存时间的关系。结果:卵巢癌组织中EGFR和LRP的阳性率分别为73.68%和71.79%,均显著高于正常卵巢组织和良性肿瘤组织(P<0.01);EGFR高表达于Ⅲ～Ⅳ期、低分化和有腹水的卵巢癌组织中(P<0.05)。EGFR和LRP阳性者近期化疗有效率分别为57.14%和53.70%,低于阴性者(P<0.05);化疗耐药型卵巢癌患者EGFR和LRP阳性率分别为92.86%和85.71%,高于化疗敏感型(P<0.05)。生存分析表明,卵巢癌患者3年生存率为53.00%。EGFR、LRP阳性和近期化疗疗效无效者术后生存时间短(P<0.01)。结论:EGFR和LRP可作为预测卵巢癌化疗耐药及预后的指标。

原发性双侧乳腺癌P-gp LRP的表达及其与预后相关性的研究

目的:探讨P-糖蛋白(P-gp)、肺耐药蛋白(LRP)在双侧乳腺癌中的表达特点及其预后意义。方法:收集我院1989～2000年收治的原发性双侧乳腺癌45例,同时随机选取单侧乳腺癌病例41例作为对照。应用免疫组化方法(S-P法)检测P-gp与LRP在双侧乳腺癌第一癌、第二癌及单侧乳腺癌中的表达。结果:1)双侧乳腺癌第一癌、第二癌及单侧乳腺癌中P-gp表达率分别为66.7%、46.7%、26.8%。显示双乳癌第一癌比单侧乳腺癌P-gp表达率高,差异有显著性(P<0.01)。双乳癌第一癌、第二癌及单乳癌中LRP表达率分别77.8%、75.6%、52.3%,显示双侧乳腺癌第一癌及第二癌比单侧乳腺癌LRP表达率高,差异有显著性(P<0.05)。2)P-gp、LRP表达与双乳癌原发肿瘤大小、组织学分级、病理类型无关,与临床分期有关。LRP与双侧乳腺癌淋巴结转移情况有关。3)双侧乳腺癌第二癌P-gp的表达情况与复发转移情况有关,P-gp、LRP的不同表达状态与双乳癌生存率的差异无统计学意义。结论:P-gp、LRP可能与双侧乳腺癌发病有关,它们有可能成为遴选双侧乳腺癌高危患者的蛋白检测指标和预后因子。

P-gp、MRP、LRP、P53及c-erbB-2在非小细胞肺癌中的表达

目的:探讨P糖蛋白(P-gp)、多药耐药相关蛋白(MRP)、肺耐药蛋白(LRP)、P53蛋白及c-erbB-2蛋白在术前未经治疗的非小细胞肺癌(NSCLC)中的表达及相互间的关系。方法:采用免疫组化法检测78例NSCLC癌组织及15例癌旁肺组织(距癌灶5 cm)中P-gp、MRP、LRP、P53及c-erbB-2的蛋白表达情况。结果:免疫组化显示P-gp、MRP、LRP、P53及c-erbB-2在肺癌组织中的阳性表达率分别是65.4%(51/78)、39.7%(31/78)、56.4%(44/78)、53.8%(42/78)及43.6%(34/78),均显著高于癌旁肺组织中的表达水平(P<0.05);MRP和LRP蛋白表达在不同病理类型(腺癌、鳞癌及大细胞癌)之间比较均具有显著性差异(P分别为0.008和<0.001),LRP及P53蛋白表达在不同病理分化程度之间具有显著性差异(P分别为0.025和0.026);c-erbB-2表达与P-gp、MRP、LRP、P53均有相关性(Spearman相关系数分别为0.317、0.401、0.519和0.341,P值分别为0.005、<0.001、<0.001和0.002),P53与MRP之间(Spearman相关系数为=0.260,P=0.022)以及LRP与MRP之间(Spearman相关系数为0.371,P=0.001)有相关性。结论:P-gp、MRP、LRP、P53及c-erbB-2这些蛋白的表达在NSCLC的多药耐药形成及肿瘤的发生发展中可能具有一定的协同作用。

鼻咽癌组织中P-gp、MRP和LRP的表达及其临床意义

目的探讨多药耐药基因蛋白(P-gp)、多药耐药相关蛋白(MRP)和肺耐药相关蛋白(LRP)在鼻咽癌组织中的表达情况及其临床意义。方法应用单克隆抗体多药耐药相关蛋白(P-gp),多药耐药基因蛋白(MRP),肺耐药相关蛋白(LRP),对54例鼻咽癌初诊患者的肿瘤组织进行免疫组化检测。结果3项多药耐药指标在54例患者中有不同程度表达。P-gp、MRP、LRP的表达与鼻咽癌病理类型、临床分期及有无淋巴结转移不相关;P-gp表达与MRP、LRP表达不相关,MRP与LRP表达间呈正相关。结论联合检测LP-gp、MRP、LRP在鼻咽癌组织中的表达,对鼻咽癌化疗药物的选择及预后的判断都有重要的参考价值。

LRP与MRP在乳腺癌组织中的表达及意义

目的研究乳腺癌组织中肺耐药蛋白(LRP)、多药耐药相关蛋白(MRP)的表达及其意义。方法应用流式细胞术检测51例乳腺癌组织中LRP及MRP的表达情况,分析其与患者年龄、肿瘤大小、腋窝淋巴结转移及雌激素受体(ER)、孕激素受体(PR)表达状态等因素的关系,并探讨两者表达的相关性。结果LRP、MRP相对表达水平(用荧光强度表示)分别为0.46±0.84、1.51±1.57;除MRP与肿瘤大小相关外,两者与患者年龄、腋窝淋巴结转移、激素受体等均无相关性;乳腺癌组织中LRP与MRP表达水平间存在高度正相关(r=0.434,P=0.004)。结论部分乳腺癌具有原发性耐药,多药耐药表型隐含在乳腺癌组织中,不受化学药物的诱导,与恶性表型同时发生,且不受疾病发展的影响;MRP与肿瘤细胞增殖能力有一定关系,在肿瘤的发展过程中起重要作用;LRP似未参与乳腺癌的多药耐药机制,但与MRP在引起乳腺癌耐药方面具很大的协同性。

金复康口服液对耐药人肺腺癌A549/DDP膜转运蛋白LRP MRPmRNA表达的影响

目的:从逆转多药耐药的角度,研究金复康口服液对耐药人肺腺癌细胞A549/DDP的化疗增效的作用和分子机制。方法:应用血清药理学方法,选择A549、A549/DDP细胞,实验分为实验组和空白对照组,从细胞水平、分子水平进行研究。结果:金复康口服液低剂量能够逆转A549/DDP对DDP的耐药,逆转耐药倍数为3.45倍,与DDP(320μmol/L)合用,使DDP(320μmol/L)对A549/DDP细胞的抑制率由47.55%升高为73.32%,且q>1.15,表明金复康口服液与DDP合用有明显的协同增效作用,增加了DDP对A549/DDP细胞的敏感度;金复康口服液低剂量能够降低A549/DDP膜转运蛋白LRP、MRP的mRNA表达。结论:(1)低剂量金复康口服液与DDP合用能够增加DDP对A549/DDP的增殖抑制作用,二者具有显著的协同增效作用。(2)金复康口服液能够降低A549/DDP膜转运蛋白LRP、MRP的mRNA表达。金复康口服液可能通过降低耐药肿瘤细胞膜转运蛋白的表达而逆转肿瘤多药耐药,为扶正方药对化疗增效机理提供了新的实验依据。

COX-2与LRP在胃癌组织中的表达及其意义

目的:观察环氧合酶-2(cyclooxygenase-2,COX-2)及肺耐药蛋白(lung resistance protein,LRP)在胃癌组织中的表达,探讨COX-2介导胃癌耐药与LRP的关系.方法:采用免疫组织化学法,检测63例胃癌标本与30例非胃癌胃组织中COX-2和LRP的表达,并分析其表达与胃癌的组织学类型、分化程度、淋巴结转移及与患者的年龄、性别的关系.结果:COX-2和LRP在胃癌组织中阳性表达率高于非胃癌胃组织(87.3%vs53.3%,66.7%vs43.3%,均P<0.05).胃癌组织中COX-2和LRP的表达与患者的年龄、性别及组织的分化程度、浸润深度等无明显关系;COX-2在淋巴结转移患者的阳性表达率明显高于无转移者(100%vs69.2%,P<0.05),而LRP的表达与淋巴结转移无明显关系.在胃癌组织中COX-2与LRP的表达呈正相关(r=0.033,P<0.05).结论:LRP可能是引起胃癌原发性耐药的耐药蛋白之一;COX-2可能通过影响LRP的表达介导胃癌耐药性的发生.

LRP、P-gp、GST-π、Topo在肺癌中的表达及其临床意义

目的 探讨多药耐药 (MDR)基因产物肺耐药蛋白 (L RP)、P-糖蛋白 (P- gp)、谷胱甘肽 S-转移酶 -π(GST-π)、DNA拓扑异构酶 (Topo )在肺癌中的表达及其临床意义。 方法 应用单克隆抗体、免疫组化技术 SP法 ,对5 8例肺癌标本进行上述 4种 MDR指标检测。 结果 在肺癌组织中 L RP、P- gp、GST- π、Topo 表达的阳性率分别为 79.3%、70 .7%、82 .8%和 84 .5 % ,其表达与性别、年龄、部位、临床分期无关 (P>0 .0 5 ) ;在未分化、小细胞型肺癌中L RP、P- gp、GST- π表达的阳性率明显降低 (P<0 .0 5 ) ;鳞癌、腺癌、支气管肺泡癌与小细胞癌相比 ,L RP、GST- π表达的强度明显增高 (P<0 .0 5 ) ;L RP、GST-π的表达强度随分化程度的降低而降低 ,Topo 的表达强度随分化程度的降低而升高 (P<0 .0 5 )。 结论 L RP、P- gp、GST- π、Topo 在未化疗过的肺癌组织中均有不同程度的高表达 ,且与肺癌的某些生物学行为有关 ,联合检测有助于化疗药物的选择及预后的判断。