Although p21-activated kinase 2(PAK2)is an essential serine/threonine protein kinase,its role in the progression of lung squamous cell carcinoma(LUSC)has yet to be fully understood.We analyzed PAK2 mRNA levels,DNA cop...Although p21-activated kinase 2(PAK2)is an essential serine/threonine protein kinase,its role in the progression of lung squamous cell carcinoma(LUSC)has yet to be fully understood.We analyzed PAK2 mRNA levels,DNA copy numbers,and protein levels by quantitative reverse transcription-PCR and immunohistochemical staining in both human LUSC tissues and adjacent normal tissues.Then,we performed colony formation assays,cell counting kit-8 assays,Matrigel invasion assays,wound healing assays,and xenograft models in nude mice to investigate the functions of PAK2 in LUSC progression.We demonstrated that PAK2 mRNA levels,DNA copy numbers,and protein levels were upregulated in human LUSC tissues,compared with adjacent normal tissues.Additionally,higher PAK2 expression was associated with poorer prognosis in LUSC patients.In the in vitro study,we found that PAK2 promoted cell growth,migration,invasion,epithelialmesenchymal transition,and cell morphology regulation in LUSC cells.Mechanistically,PAK2 promoted tumor cell proliferation,migration,and invasion by regulating actin dynamics through the LIMK1/cofilin signaling pathway.Our findings indicate that the PAK2/LIMK1/cofilin signaling pathway may serve as a potential clinical marker and therapeutic target for LUSC.展开更多
目的探讨p57kip2mRNA、LIMK-1mRNA及其蛋白在胃腺癌组织中的表达,了解其与肿瘤组织分化程度及临床病理特征的关系。方法采用显色原位杂交(chromogenic in situ hybridizations,CISH)技术和免疫组化EnVision法检测40例胃腺癌及癌旁正常...目的探讨p57kip2mRNA、LIMK-1mRNA及其蛋白在胃腺癌组织中的表达,了解其与肿瘤组织分化程度及临床病理特征的关系。方法采用显色原位杂交(chromogenic in situ hybridizations,CISH)技术和免疫组化EnVision法检测40例胃腺癌及癌旁正常胃黏膜组织中p57kip2mRNA、LIMK-1mRNA及其蛋白的表达。结果 (1)正常胃黏膜组织中p57kip2高表达,在胃腺癌组织中低表达,差异具有统计学意义(P<0.05);(2)p57kip2的表达与胃腺癌组织分化程度呈负相关(P<0.05);(3)p57kip2、LIMK-1蛋白表达与胃腺癌组织中微脉管计数微淋巴管密度(lymphaticmicrovessel density,LVD)、微血管密度(microvesseldensi-ty,MVD)呈正相关(P<0.05)。结论胃腺癌存在p57kip2基因组印记缺失,致p57kip2mRNA及其蛋白表达减少或缺失,并与胃腺癌组织分化程度有关,LIMK-1蛋白高表达与肿瘤的浸润转移及微脉管的生成有关,检测胃癌活检标本中LIMK-1蛋白的表达,对预测胃腺癌预后及浸润转移有辅助诊断意义。展开更多
基金National Natural Science Foundation of China(Grant No.32300615)Nanjing Medical Science and Technique Development Foundation(Grant No.JQX19010)。
文摘Although p21-activated kinase 2(PAK2)is an essential serine/threonine protein kinase,its role in the progression of lung squamous cell carcinoma(LUSC)has yet to be fully understood.We analyzed PAK2 mRNA levels,DNA copy numbers,and protein levels by quantitative reverse transcription-PCR and immunohistochemical staining in both human LUSC tissues and adjacent normal tissues.Then,we performed colony formation assays,cell counting kit-8 assays,Matrigel invasion assays,wound healing assays,and xenograft models in nude mice to investigate the functions of PAK2 in LUSC progression.We demonstrated that PAK2 mRNA levels,DNA copy numbers,and protein levels were upregulated in human LUSC tissues,compared with adjacent normal tissues.Additionally,higher PAK2 expression was associated with poorer prognosis in LUSC patients.In the in vitro study,we found that PAK2 promoted cell growth,migration,invasion,epithelialmesenchymal transition,and cell morphology regulation in LUSC cells.Mechanistically,PAK2 promoted tumor cell proliferation,migration,and invasion by regulating actin dynamics through the LIMK1/cofilin signaling pathway.Our findings indicate that the PAK2/LIMK1/cofilin signaling pathway may serve as a potential clinical marker and therapeutic target for LUSC.
