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中华腔镜泌尿外科杂志(电子版) ›› 2021, Vol. 15 ›› Issue (05) : 367 -372. doi: 10.3877/cma.j.issn.1674-3253.2021.05.002

总编专栏

年龄相关钙蛋白酶2上调C499促进前列腺间质细胞增生导致前列腺增生的发生机制
梁伟聪1, 孙卓伦1, 毛云华1, 王喻1, 李科1, 高新1,()   
  1. 1. 510600 广州,中山大学附属第三医院泌尿外科
  • 收稿日期:2021-06-18 出版日期:2021-10-01
  • 通信作者: 高新
  • 基金资助:
    2017年国家重点研发计划(2017YFC0908004); 2017年国家自然科学基金面上项目(8177102020); 2017年广东省科技计划项目(2017B020227008)

Calpain 2 up-regulate C499 in the prostatic stroma and promotes the proliferation of interstitial cells, leading to the occurrence of BPH

Weicong Liang1, Zhuolun Sun1, Yunhua Mao1, Yu Wang1, Ke Li1, Xin Gao1,()   

  1. 1. Department of Urology, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou 510630, China
  • Received:2021-06-18 Published:2021-10-01
  • Corresponding author: Xin Gao
引用本文:

梁伟聪, 孙卓伦, 毛云华, 王喻, 李科, 高新. 年龄相关钙蛋白酶2上调C499促进前列腺间质细胞增生导致前列腺增生的发生机制[J/OL]. 中华腔镜泌尿外科杂志(电子版), 2021, 15(05): 367-372.

Weicong Liang, Zhuolun Sun, Yunhua Mao, Yu Wang, Ke Li, Xin Gao. Calpain 2 up-regulate C499 in the prostatic stroma and promotes the proliferation of interstitial cells, leading to the occurrence of BPH[J/OL]. Chinese Journal of Endourology(Electronic Edition), 2021, 15(05): 367-372.

目的

探讨前列腺增生(BPH)的发病机制。我们前期发现塌陷反应调节蛋白4(CRMP4)受前列腺组织内钙调蛋白2切割产生两个片段,其中N端产物为C499(1-498aa),C499进入细胞核作用E2F1促进细胞增殖。我们认为C499上升促进前列腺间质细胞增生导致BPH的发生。

方法

收集BPH病例按年龄建立队列。分别做CD86+M1巨噬细胞、钙蛋白酶2、C499、CRMP4的免疫组化(IHC),评估CD86+M1巨噬细胞、钙蛋白酶2与C499表达与年龄和BPH间质组织增生的联系。C499基因质粒转染RWPE-1细胞,观察细胞增殖。

结果

在60例BPH患者各年龄组,IHC检测显示CD86+M1巨噬细胞、钙蛋白酶2、C499在前列腺间质表达,随年龄增长而升高;而前列腺上皮细胞内CRMP4表达随年龄增加而逐渐减少。CCK-8实验显示C499促进RWPE-1生长。

结论

随着年龄增长,BPH患者前列腺间质细胞CD86+M1巨噬细胞增加,激活钙蛋白酶2活性;切割因上皮间质细胞转化至前列腺间质细胞的CRMP4,促使C499在前列腺间质表达升高,C499促进前列腺间质细胞增殖,导致BPH的发生。

Objective

To explore the pathogenesis of benign prostatic hyperplasia (BPH). Previously we found that C499 (1-498aa), the N-terminal product of collapsin response mediator protein 4 (CRMP4), increases with age. Basically, C499 enters the nucleus and binds with promoter of E2F1 to promote cell proliferation. Accordingly, we believe that the accumulation of C499 promotes prostatic stromal cell proliferation and leads to the occurrence of BPH.

Methods

60 patients with BPH were enrolled to establish a cohort by age. Immunohistochemistry (IHC) of M1 macrophages, calpain 2, C499, and CRMP4 were respectively performed to evaluate the number of M1 macrophages, the expression status of calpain 2 and C499 in BPH paraffin samples in accordance with aging and stromal cell proliferation in patients with BPH. In addition, The C499 gene plasmid was transfected into RWPE-1 cells, and the cell proliferation was observed.

Results

60 patients were divided into 4 group according with age (50~, 60~, 70~, 80~. In each group, IHC analysis showed that the number of M1 macrophages increased in the prostatic interstitium with age; calpain 2 was expressed in prostatic interstitial cells and elevated with age; C499 was mainly expressed in the prostatic stromal was up-regulated with age whereas CRMP4 in epithelial cell was reduced along with age. The CCK-8 experiment showed that C499 promoted the growth of RWPE-1.

Conclusion

With age increases, M1 type macrophages in prostate mesenchymal cells in BPH patients was gradually accumulated and thus activated calpain 2 activity. Given epithelial-mesenchymal transition is evolutionary processed with age in BPH, CRMP4 in prostate epithelial cells was moved to prostate stromal and cleaved by calpain 2. Accumulation of C499 in prostatic stromal stimulated to proliferation of stromal cells, leading to the occurrence of BPH.

表1 各年龄组BPH患者临床指标的比较(±s
图1 ΔC499和CRMP4在不同年龄分组BPH患者的前列腺上皮与间质组织中的表达情况(免疫组化×100和×200) 注:a:ΔC499在不同年龄分组BPH患者的前列腺上皮与间质组织中的表达情况;b:ΔC499蛋白质IRS评分的柱状图;c:CRMP4在不同年龄分组BPH患者的前列腺上皮与间质组织中的表达情况;d:CRMP4蛋白质IRS评分的柱状图。*表示P<0.05,柱状图中各组数据均以(±s)表示(n=15)
图2 CD86+M1巨噬细胞和Calpain-2蛋白在不同年龄分组BPH患者的前列腺上皮与间质组织中的表达情况(免疫组化×100和×200) 注:a:CD86+M1型巨噬细胞在不同年龄分组BPH患者的前列腺上皮与间质组织中的表达情况;b:前列腺间质组织中CD86+M1型巨噬细胞数量的柱状图/×200视野;c:Calpain-2在不同年龄分组BPH患者的前列腺上皮与间质组织中的表达情况;d:前列腺间质组织中Calpain-2蛋白颗粒数量的柱状图/×200视野。*表示P<0.05,**表示P<0.01。柱状图中各组数据均以(±s)表示(n=15)
图3 ΔC499促进正常前列腺上皮细胞RWPE-1增殖功能,而CRMP4抑制RWPE-1细胞增殖功能 注:a:RWPE-1细胞转染ΔC499过表达质粒后通过CCK-8实验检测细胞增殖能力;b:RWPE-1细胞转染CRMP4过表达质粒后通过CCK-8实验检测细胞增殖能力。*表示P<0.05,折线图中各组数据均以(±s)表示(n=3)
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