BACKGROUND Necroptosis has emerged as a novel molecular pathway that can be targeted by chemotherapy agents in the treatment of cancer.OSW-1,which is derived from the bulbs of Ornithogalum saundersiae Baker,exerts a w...BACKGROUND Necroptosis has emerged as a novel molecular pathway that can be targeted by chemotherapy agents in the treatment of cancer.OSW-1,which is derived from the bulbs of Ornithogalum saundersiae Baker,exerts a wide range of pharmaco-logical effects.AIM To explore whether OSW-1 can induce necroptosis in colorectal cancer(CRC)cells,thereby expanding its range of clinical applications.METHODS We performed a sequence of functional experiments,including Cell Counting Kit-8 assays and flow cytometry analysis,to assess the inhibitory effect of OSW-1 on CRC cells.We utilized quantitative proteomics,employing tandem mass tag label-ing combined with liquid chromatography-tandem mass spectrometry,to analyze changes in protein expression.Subsequent bioinformatic analysis was conducted to elucidate the biological processes associated with the identified proteins.Transmission electron microscopy(TEM)and immunofluorescence studies were also performed to examine the effects of OSW-1 on necroptosis.Finally,western blotting,siRNA experiments,and immunoprecipitation were employed to evaluate protein interactions within CRC cells.RESULTS The results revealed that OSW-1 exerted a strong inhibitory effect on CRC cells,and this effect was accompanied by a necroptosis-like morphology that was observable via TEM.OSW-1 was shown to trigger necroptosis via activation of the RIPK1/RIPK3/MLKL pathway.Furthermore,the accumulation of p62/SQSTM1 was shown to mediate OSW-1-induced necroptosis through its interaction with RIPK1.CONCLUSION We propose that OSW-1 can induce necroptosis through the RIPK1/RIPK3/MLKL signaling pathway,and that this effect is mediated by the RIPK1-p62/SQSTM1 complex,in CRC cells.These results provide a theoretical foundation for the use of OSW-1 in the clinical treatment of CRC.展开更多
Autophagy plays a pivotal role in diverse biological processes,including the maintenance and differentiation of neural stem cells(NSCs).Interestingly,while complete deletion of Fip200 severely impairs NSC maintenance ...Autophagy plays a pivotal role in diverse biological processes,including the maintenance and differentiation of neural stem cells(NSCs).Interestingly,while complete deletion of Fip200 severely impairs NSC maintenance and differentiation,inhibiting canonical autophagy via deletion of core genes,such as Atg5,Atg16l1,and Atg7,or blockade of canonical interactions between FIP200 and ATG13(designated as FIP200-4A mutant or FIP200 KI)does not produce comparable detrimental effects.This highlights the likely critical involvement of the non-canonical functions of FIP200,the mechanisms of which have remained elusive.Here,utilizing genetic mouse models,we demonstrated that FIP200 mediates non-canonical autophagic degradation of p62/sequestome1,primarily via TAX1BP1 in NSCs.Conditional deletion of Tax1bp1 in fip200hGFAP conditional knock-in(cKI)mice led to NSC deficiency,resembling the fip200hGFAP conditional knockout(cKO)mouse phenotype.Notably,reintroducing wild-type TAX1BP1 not only restored the maintenance of NSCs derived from tax1bp1-knockout fip200hGFAP cKI mice but also led to a marked reduction in p62 aggregate accumulation.Conversely,a TAX1BP1 mutant incapable of binding to FIP200 or NBR1/p62 failed to achieve this restoration.Furthermore,conditional deletion of Tax1bp1 in fip200hGFAP cKO mice exacerbated NSC deficiency and p62 aggregate accumulation compared to fip200hGFAP cKO mice.Collectively,these findings illustrate the essential role of the FIP200-TAX1BP1 axis in mediating the non-canonical autophagic degradation of p62 aggregates towards NSC maintenance and function,presenting novel therapeutic targets for neurodegenerative diseases.展开更多
Amyotrophic lateral sclerosis and frontotemporal lobar degeneration are multifaceted diseases with genotypic,pathological and clinical overlap.One such overlap is the presence of SQSTM1/p62 mutations.While traditional...Amyotrophic lateral sclerosis and frontotemporal lobar degeneration are multifaceted diseases with genotypic,pathological and clinical overlap.One such overlap is the presence of SQSTM1/p62 mutations.While traditionally mutations manifesting in the ubiquitin-associated domain of p62 were associated with Paget’s disease of bone,mutations affecting all functional domains of p62 have now been identified in amyotrophic lateral sclerosis and frontotemporal lobar degeneration patients.p62 is a multifunctional protein that facilitates protein degradation through autophagy and the ubiquitin-proteasome system,and also regulates cell survival via the Nrf2 antioxidant response pathway,the nuclear factor-kappa B signaling pathway and apoptosis.Dysfunction in these signaling and protein degradation pathways have been observed in amyotrophic lateral sclerosis and frontotemporal lobar degeneration,and mutations that affect the role of p62 in these pathways may contribute to disease pathogenesis.In this review we discuss the role of p62 in these pathways,the effects of p62 mutations and the effect of mutations in the p62 modulator TANK-binding kinase 1,in relation to amyotrophic lateral sclerosis-frontotemporal lobar degeneration pathogenesis.展开更多
回顾性分析1例散发性包涵体肌炎(sporadic inclusion body myositis, sIBM)患者的临床表现、肌肉影像学、肌肉组织病理学与免疫病理学、超微结构及肌炎抗体谱等特点。患者,男,69岁,双下肢无力3年余,逐渐出现握力差、吞咽费力感;肌酸激...回顾性分析1例散发性包涵体肌炎(sporadic inclusion body myositis, sIBM)患者的临床表现、肌肉影像学、肌肉组织病理学与免疫病理学、超微结构及肌炎抗体谱等特点。患者,男,69岁,双下肢无力3年余,逐渐出现握力差、吞咽费力感;肌酸激酶轻度升高;EMG示肌源性损害;大腿肌肉MRI示双侧股外侧肌、股内侧肌及股中间肌脂肪浸润,股直肌、半膜肌及半腱肌相对保留;肌肉组化示中度炎症性肌病改变,伴镶边空泡及p62(Sequestosome-1)、TDP-43(TAR DNA binding protein-43)在胞内聚集;电镜下肌丝间可见中等量涡轮状髓样小体;肌炎抗体谱示cN1A(cytoplasmic 5'-nucleotidase 1A)抗体阳性。sIBM的起病年龄及肌群受累模式有其特殊性,但早期临床表现缺乏特异性,诊断困难,分子生物标记物有助于确诊及机制研究。展开更多
文摘目的 基于c-Jun氨基末端激酶(JNK)-p62/螯合体(SQSTM1)信号通路探讨糖肾煎对2型糖尿病肾病(DN)大鼠足细胞的保护作用。方法 SD大鼠随机分成正常组、DN组、糖肾煎低、中、高[生药5、10、20 g/(kg·d)]剂量组(糖肾煎-L、M、H组)、二甲双胍组[100 mg/(kg·d)]。除正常组外,其余各组通过喂养高脂高糖饲料和腹腔注射链脲佐菌素(STZ)进行DN模型构建。药物干预结束后,检测大鼠血生化指标空腹血糖(FBG)、负荷后2 h血糖(P2 h BG)、血肌酐(SCr)、血尿素氮(BUN)水平;苏木素-伊红(HE)、六胺银(PASM)染色观察肾组织病理学变化;透射电镜(TEM)观察肾小球基底膜损伤和足细胞变化情况;Western印迹检测肾组织中微管相关蛋白1A/1B-轻链(LC)3、p-JNK、JNK、p62/SQSTM1、肾病蛋白(Nephrin)蛋白表达。结果 与正常组比较,DN组FBG、P2 h BG、SCr、BUN水平及p62/SQSTM1蛋白表达明显升高,LC3-Ⅱ、Nephrin蛋白表达和p-JNK/JNK明显降低(P<0.05);光镜下观察到肾小球缩小、管丛系膜明显扩张,并有基底膜增生增厚等现象;TEM下观察到肾小球基底膜增厚、足细胞排列紊乱、形态改变、足突融合等现象。与DN组比较,糖肾煎-L、M、H组和二甲双胍组FBG、P2 h BG、SCr、BUN水平及p62/SQSTM1蛋白表达明显降低,LC3-Ⅱ、Nephrin蛋白表达和p-JNK/JNK明显升高(P<0.05);并且肾小球基底膜增厚、足细胞足突融合等情况均获得一定程度减轻。结论 糖肾煎对2型DN大鼠足细胞具有一定保护作用,可能是通过调控JNK-p62/SQSTM1信号通路,提高足细胞自噬,从而起到肾脏保护功效。
基金Supported by the Natural Science Foundation of Liaoning Province,No.2022-MS-330and Key Projects in Liaoning Province,No.2020JH2/10300046.
文摘BACKGROUND Necroptosis has emerged as a novel molecular pathway that can be targeted by chemotherapy agents in the treatment of cancer.OSW-1,which is derived from the bulbs of Ornithogalum saundersiae Baker,exerts a wide range of pharmaco-logical effects.AIM To explore whether OSW-1 can induce necroptosis in colorectal cancer(CRC)cells,thereby expanding its range of clinical applications.METHODS We performed a sequence of functional experiments,including Cell Counting Kit-8 assays and flow cytometry analysis,to assess the inhibitory effect of OSW-1 on CRC cells.We utilized quantitative proteomics,employing tandem mass tag label-ing combined with liquid chromatography-tandem mass spectrometry,to analyze changes in protein expression.Subsequent bioinformatic analysis was conducted to elucidate the biological processes associated with the identified proteins.Transmission electron microscopy(TEM)and immunofluorescence studies were also performed to examine the effects of OSW-1 on necroptosis.Finally,western blotting,siRNA experiments,and immunoprecipitation were employed to evaluate protein interactions within CRC cells.RESULTS The results revealed that OSW-1 exerted a strong inhibitory effect on CRC cells,and this effect was accompanied by a necroptosis-like morphology that was observable via TEM.OSW-1 was shown to trigger necroptosis via activation of the RIPK1/RIPK3/MLKL pathway.Furthermore,the accumulation of p62/SQSTM1 was shown to mediate OSW-1-induced necroptosis through its interaction with RIPK1.CONCLUSION We propose that OSW-1 can induce necroptosis through the RIPK1/RIPK3/MLKL signaling pathway,and that this effect is mediated by the RIPK1-p62/SQSTM1 complex,in CRC cells.These results provide a theoretical foundation for the use of OSW-1 in the clinical treatment of CRC.
基金National Natural Science Foundation of China(U2004138,81773132,81820108021)University Excellent Teaching Team of“Qinglan Project”in Jiangsu Province(2022-25)+1 种基金Henan Province Key Research and Development Project(232102521028)Excellent Youth Foundation of Henan Scientific Committee(21230040016)。
文摘Autophagy plays a pivotal role in diverse biological processes,including the maintenance and differentiation of neural stem cells(NSCs).Interestingly,while complete deletion of Fip200 severely impairs NSC maintenance and differentiation,inhibiting canonical autophagy via deletion of core genes,such as Atg5,Atg16l1,and Atg7,or blockade of canonical interactions between FIP200 and ATG13(designated as FIP200-4A mutant or FIP200 KI)does not produce comparable detrimental effects.This highlights the likely critical involvement of the non-canonical functions of FIP200,the mechanisms of which have remained elusive.Here,utilizing genetic mouse models,we demonstrated that FIP200 mediates non-canonical autophagic degradation of p62/sequestome1,primarily via TAX1BP1 in NSCs.Conditional deletion of Tax1bp1 in fip200hGFAP conditional knock-in(cKI)mice led to NSC deficiency,resembling the fip200hGFAP conditional knockout(cKO)mouse phenotype.Notably,reintroducing wild-type TAX1BP1 not only restored the maintenance of NSCs derived from tax1bp1-knockout fip200hGFAP cKI mice but also led to a marked reduction in p62 aggregate accumulation.Conversely,a TAX1BP1 mutant incapable of binding to FIP200 or NBR1/p62 failed to achieve this restoration.Furthermore,conditional deletion of Tax1bp1 in fip200hGFAP cKO mice exacerbated NSC deficiency and p62 aggregate accumulation compared to fip200hGFAP cKO mice.Collectively,these findings illustrate the essential role of the FIP200-TAX1BP1 axis in mediating the non-canonical autophagic degradation of p62 aggregates towards NSC maintenance and function,presenting novel therapeutic targets for neurodegenerative diseases.
基金supported by the NHMRC-ARC Dementia Research Development Fellowship Grant(AP1102977)an Australian Government Research Training Program(RTS)Scholarship。
文摘Amyotrophic lateral sclerosis and frontotemporal lobar degeneration are multifaceted diseases with genotypic,pathological and clinical overlap.One such overlap is the presence of SQSTM1/p62 mutations.While traditionally mutations manifesting in the ubiquitin-associated domain of p62 were associated with Paget’s disease of bone,mutations affecting all functional domains of p62 have now been identified in amyotrophic lateral sclerosis and frontotemporal lobar degeneration patients.p62 is a multifunctional protein that facilitates protein degradation through autophagy and the ubiquitin-proteasome system,and also regulates cell survival via the Nrf2 antioxidant response pathway,the nuclear factor-kappa B signaling pathway and apoptosis.Dysfunction in these signaling and protein degradation pathways have been observed in amyotrophic lateral sclerosis and frontotemporal lobar degeneration,and mutations that affect the role of p62 in these pathways may contribute to disease pathogenesis.In this review we discuss the role of p62 in these pathways,the effects of p62 mutations and the effect of mutations in the p62 modulator TANK-binding kinase 1,in relation to amyotrophic lateral sclerosis-frontotemporal lobar degeneration pathogenesis.
文摘回顾性分析1例散发性包涵体肌炎(sporadic inclusion body myositis, sIBM)患者的临床表现、肌肉影像学、肌肉组织病理学与免疫病理学、超微结构及肌炎抗体谱等特点。患者,男,69岁,双下肢无力3年余,逐渐出现握力差、吞咽费力感;肌酸激酶轻度升高;EMG示肌源性损害;大腿肌肉MRI示双侧股外侧肌、股内侧肌及股中间肌脂肪浸润,股直肌、半膜肌及半腱肌相对保留;肌肉组化示中度炎症性肌病改变,伴镶边空泡及p62(Sequestosome-1)、TDP-43(TAR DNA binding protein-43)在胞内聚集;电镜下肌丝间可见中等量涡轮状髓样小体;肌炎抗体谱示cN1A(cytoplasmic 5'-nucleotidase 1A)抗体阳性。sIBM的起病年龄及肌群受累模式有其特殊性,但早期临床表现缺乏特异性,诊断困难,分子生物标记物有助于确诊及机制研究。
