中国药学(英文版) ›› 2023, Vol. 32 ›› Issue (11): 867-880.DOI: 10.5246/jcps.2023.11.070
收稿日期:
2023-03-24
修回日期:
2023-05-12
接受日期:
2023-06-08
出版日期:
2023-12-02
发布日期:
2023-12-02
通讯作者:
陈培杰
作者简介:
基金资助:
Peijie Chen1,2,*(), Yuntian Zhang3,4
Received:
2023-03-24
Revised:
2023-05-12
Accepted:
2023-06-08
Online:
2023-12-02
Published:
2023-12-02
Contact:
Peijie Chen
摘要:
肝星状细胞(HSCs)的活化是肝纤维化病程进展中的核心环节。肝纤维化是一个可逆的病理过程, 去除病因后, 肝纤维化可以通过活化的HSCs凋亡和失活发生逆转。我们前期研究发现, 蛋白酪氨酸磷酸酶1B(PTP1B)在肝纤维化进展期和逆转恢复期, 可分别促进HSC活化和抑制aHSCs失活。但其在肝纤维化逆转期, 对活化的HSCs凋亡的作用尚不明确。为了探究PTP1B对aHSCs凋亡的影响, 本实验构建了小鼠肝纤维化及逆转模型; 体外培养了大鼠肝星状细胞系HSC-T6, TGF-β1刺激活化后给予TRAIL诱导其凋亡以模拟肝纤维化逆转期aHSC凋亡过程。结果显示, PTP1B在肝纤维化肝组织中表达上调, 而在纤维化自发恢复后表达降低。PTP1B在活化的HSC-T6中表达上调, 在凋亡的aHSCs中表达下降。此外, PTP1B抑制了TRAIL的肝纤维化缓解效应, 表现为过表达PTP1B后, TRAIL无法降低α-平滑肌肌动蛋白(α-SMA)及胶原蛋白的表达。同时, 过表达PTP1B可以抑制TRAIL诱导的细胞凋亡, 减少凋亡细胞的数量, 降低凋亡蛋白的表达及活性。研究表明, PTP1B可以通过影响aHSCs的凋亡参与肝纤维化的逆转。
Supporting:
陈培杰, 张云天. PTP1B抑制肝纤维化逆转期TRAIL诱导的肝星状细胞凋亡[J]. 中国药学(英文版), 2023, 32(11): 867-880.
Peijie Chen, Yuntian Zhang. PTP1B restrains the apoptosis of activated hepatic stellate cells (HSCs) induced by TRAIL during the resolution of liver fibrosis[J]. Journal of Chinese Pharmaceutical Sciences, 2023, 32(11): 867-880.
Figure 1. The expression of PTP1B in the livers from control, model and recovery groups, n = 12 per group. (A) Pathology observation of the experimental mouse liver sections stained with hematoxylin eosin (H&E) staining and Masson staining. Representative views from each group are presented (×100). (B) The expression of PTP1B and α-SMA were analyzed by immune-histochemistry in control, model, and recovery livers. Representative views from each group are presented (×100). (C) The levels of PTP1B, Col1α1, TRAIL and α-SMA protein were assessed by WB. The results are expressed as relative expression against negative control expression. Representative blots of three independent experiments are shown. **P < 0.01 vs control; ##P < 0.01 vs model.
Figure 2. The expression of PTP1B in HSC-T6 cells. (A) After exposure to TGF-β1, activated HSC-T6 cells were treated with TRAIL to induce apoptosis. The apoptosis of activated HSC-T6 cells were measured by flow cytometry. One representative experiment of the three independent experiments is demonstrated. #P < 0.05 vs TGF-β1. (B) The mRNA level of PTP1B, Col1α1 and α-SMA in apoptotic HSCs induced by TRAIL were examined by Real-time PCR, which was normalized using β-actin mRNA from each sample. *P < 0.05 vs control; **P < 0.01 vs control; #P < 0.05 vs TGF-β1, ##P < 0.01 vs TGF-β1. (C) The protein level of PTP1B, Col1α1 and α-SMA in apoptotic HSCs induced by TRAIL were assessed by WB. Representative blots of three independent experiments are presented. **P < 0.01 vs control; ##P < 0.01 vs TGF-β1.
Figure 3. The effect of PTP1B on the synthesis of extracellular matrix of HSC-T6 cells during TRAIL exposure. HSC-T6 cells activated by TGF-β1 were transfected with PTP1B or control plasmid to produce PTP1B-overexpressing and control cells, respectively. The cells were then treated with TRAIL to induce apoptosis. (A) The mRNA levels of PTP1B, Col1α1, and α-SMA in HSCs were examined by Real-time PCR and normalized using β-actin mRNA from each sample. **P < 0.01 vs TGF-β1; #P < 0.05 vs TGF-β1 + TRAIL + pEX3-control, ##P < 0.01 vs TGF-β1 + TRAIL + pEX3-control. (B) Protein levels of PTP1B, Col1α1, and α-SMA were assessed by WB. Representative blots from three independent experiments are presented. **P < 0.01 vs TGF-β1; #P < 0.05 vs TGF-β1 + TRAIL + pEX3-control, ##P < 0.01 vs TGF-β1 + TRAIL + pEX3-control.
Figure 4. The effect of PTP1B on TRAIL-induced apoptosis of activated HSC-T6 cells. Activated HSC-T6 cells induced by TGF-β1 were transfected with PTP1B or control plasmid to produce PTP1B-overexpressing and control cells, respectively. The cells were then treated with TRAIL to induce apoptosis. (A) Apoptosis of activated HSC-T6 cells was measured using flow cytometry. A representative experiment of three independent experiments is shown. **P < 0.01 vs TGF-β1; ##P < 0.01 vs TGF-β1 + TRAIL + pEX3-control. (B) The Caspase-3 activity was measured using a Caspase-3 activity assay kit, according to the manufacturer’s instructions. **P < 0.01 vs TGF-β1; ##P < 0.01 vs TGF-β1 + TRAIL + pEX3-control. (C) Levels of apoptosis-related proteins, including Caspase-3, Bax, and Bcl-2, were assessed by WB. Representative blots from three independent experiments are presented.
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