肿瘤第一线 · 学术知识传播

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PI3K/Akt信号通路在胃癌干细胞中的表达及意义

2021-11-19 涂江江 涂江江

为了研究研究 PI3K/Akt 信号通路在胃癌干细胞中的表达及意义。使用收集笔者所在医院普外科胃癌切除术患者胃癌组织标本的方法,应用肿瘤球悬浮分选法从组织标本中分选出胃癌干细胞和普通肿瘤细胞,再比较两

为了研究研究 PI3K/Akt 信号通路在胃癌干细胞中的表达及意义。使用收集笔者所在医院普外科胃癌切除术患者胃癌组织标本的方法,应用肿瘤球悬浮分选法从组织标本中分选出胃癌干细胞和普通肿瘤细胞,再比较两组细胞中 PI3K、Akt 的蛋白及 mRNA 的表达情况。


胃癌属于普外科常见的恶性肿瘤,源于胃黏膜上皮细胞。 研究发现,肿瘤是一种信号通路疾病。磷脂酰肌醇 3- 激酶 (PI3K)/ 蛋白质丝氨酸/苏氨酸激酶 (Akt) 是参与肿瘤发生发展的重要细胞信号通路,因此抑制该信号通路成为胃癌靶点治疗和预防转 移和复发的关键 [2-3]。但目前 PI3K/Akt 信号通路在胃癌干细胞中的表达研究罕见报道。本研究通过收集胃癌切除术患者胃癌组织标本,应用肿瘤球悬浮分选法从组织标本中分选出胃癌干细胞和普通肿瘤细胞,比较两组细胞 PI3K、Akt 的蛋白及 mRNA 表达量,以期能够为胃癌的预防和治疗提供新的依据和策略


胃干细胞是具有自我更新、无限增殖、定向分化能力的细胞。一旦胃干细胞的基因发生突变或者微环境发生改变时,就会出现增殖不受调控的干细胞,向肿瘤干细胞发生转变,引起胃癌的发生。PI3K信号通路在肿瘤的发生、发展上起着重要的调节作用,具有抑制凋亡、促进增殖的关键作用。在乳腺癌卵巢癌、非小细胞肺癌、成神经管细胞瘤等多种人类肿瘤中,均发现有PI3K信号通路的异常活化。


对PI3K 信号通路进行深入研究,对胃癌的诊断及治疗有着深远的意义.早期胃癌、中晚期胃癌中PI3K蛋白和Akt蛋白的阳性表达率均较正常胃黏膜组织高,表明PI3K、Akt与胃癌的形成和恶性进展有关,可能主要通过促进肿瘤细胞增殖和抑制肿瘤细胞凋亡起作用。研究发现,抑制PI3K活性可诱导凋亡的发生。PI3K/Akt 通路在胃癌细胞的生长、增殖及转移、侵袭表达方面都具有重要的作用叫。本课题组推测PI3K/Akt 信号通路在胃癌干细胞中可能存在异常表达。本次研究中,通过肿瘤球悬浮分选法分选组织标本中的胃癌干细胞,并进行鉴定均呈阳性表达CD44.通过与普通胃癌细胞比较,发现RT-PCR检测结果显示,胃癌干细胞组的PI3K及Akt的mRNA相对表达量为分别为0.680±0.122和0.513±0.121,明显高于普通胃癌细胞组的0.235±0.086和0.205±0.069,差异有统计学意义(P<0.05);Westem blot检测结果显示,胃癌干细胞组的PI3K及Akt的蛋白相对表达量为0.771±0.206和0.601±0.182,明显高于普通胃癌细胞组的0.215±0.012和0.218±0.028,差异有统计学意义P<0.05),表明PI3K/Akt 信号通路在胃癌干细胞中异常激活,可能参与胃癌的发生与发展,但在PI3K/Akt 信号通路如何调控胃癌干细胞的增殖、凋亡及侵袭转移上还尚不清楚,需下一步着重探讨研究。


综上所述,PI3k/Akt 信号通路在胃癌干细胞中高表达,表明它可能参与了胃癌的发生发展。

 

评论区 (6)
#插入话题
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    2022-04-28 xfpan20

    #Akt#

    0

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    2022-07-19 lidong40

    #PI3K/AKT#

    0

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    2021-12-15 fanweitanzhen
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    2021-11-22 ms1292405679162969

    #PI3K#

    0

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