Autophagy最新文献

筛选
英文 中文
A molecular glue for Prkn/parkin.
Autophagy Pub Date : 2024-12-19 DOI: 10.1080/15548627.2024.2443232
Véronique Sauvé, Kalle Gehring
{"title":"A molecular glue for Prkn/parkin.","authors":"Véronique Sauvé, Kalle Gehring","doi":"10.1080/15548627.2024.2443232","DOIUrl":"https://doi.org/10.1080/15548627.2024.2443232","url":null,"abstract":"<p><p>Parkinson disease (PD) is a neurodegenerative disease characterized by the loss of dopaminergic neurons in the <i>substantia nigra</i>, primarily due to mitochondria dysfunction. PRKN (parkin RBR E3 ubiquitin protein ligase) and PINK1 (PTEN induced kinase 1) are linked to early-onset cases of PD and essential for the clearance of damaged mitochondria via selective mitochondrial autophagy (mitophagy). In a recent publication, we detail how a small molecule can activate PRKN mutants that are unable to be phosphorylated, restoring mitophagy in cellular assays. These findings offer hope for the design of therapeutic drugs for some forms of PD.</p>","PeriodicalId":93893,"journal":{"name":"Autophagy","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142855868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Autophagy induction by piplartine ameliorates axonal degeneration caused by mutant HSPB1 and HSPB8 in charcot-marie-tooth type 2 neuropathies.
Autophagy Pub Date : 2024-12-19 DOI: 10.1080/15548627.2024.2439649
Angela Sisto, Tamira van Wermeskerken, Michael Pancher, Pamela Gatto, Bob Asselbergh, Ágata Sofia Assunção Carreira, Vicky De Winter, Valentina Adami, Alessandro Provenzani, Vincent Timmerman
{"title":"Autophagy induction by piplartine ameliorates axonal degeneration caused by mutant HSPB1 and HSPB8 in charcot-marie-tooth type 2 neuropathies.","authors":"Angela Sisto, Tamira van Wermeskerken, Michael Pancher, Pamela Gatto, Bob Asselbergh, Ágata Sofia Assunção Carreira, Vicky De Winter, Valentina Adami, Alessandro Provenzani, Vincent Timmerman","doi":"10.1080/15548627.2024.2439649","DOIUrl":"https://doi.org/10.1080/15548627.2024.2439649","url":null,"abstract":"<p><p>HSPB1 [heat shock protein family B (small) member 1] and HSPB8 are essential molecular chaperones for neuronal proteostasis, as they prevent protein aggregation. Mutant HSPB1 and HSPB8 primarily harm peripheral neurons, resulting in axonal Charcot-Marie-Tooth neuropathies (CMT2). Macroautophagy/autophagy is a shared mechanism by which HSPB1 and HSPB8 mutations cause neuronal dysfunction. Autophagosome formation is reduced in mutant HSPB1-induced pluripotent stem-cell-derived motor neurons from CMT type 2F patients. Likewise, the HSPB8<sup>K141N</sup> knockin mouse model, mimicking CMT type 2 L, exhibits axonal degeneration and muscle atrophy, with SQSTM1/p62-positive deposits. We show here that mouse embryonic fibroblasts isolated from a HSPB8<sup>K141N</sup>/green fluorescent protein (GFP)-LC3 model have diminished autophagosome production under conditions of MTOR inhibition. To correct the autophagic deficits in the HSPB1 and HSPB8 models, we screened by high-throughput autophagosome quantification the repurposing Spectrum Collection library for molecules that could boost the autophagic activity above the canonical MTOR inhibition. Hit compounds were validated on motor neurons obtained by differentiation of HSPB1<sup>P182L</sup> and HSPB8<sup>K141N</sup> patient-derived induced pluripotent stem cells, focusing on autophagy induction as well as neurite network density, axonal degeneration, and mitochondrial morphology. We identified molecules that specifically stimulate autophagosome formation in the HSPB8<sup>K141N</sup> cells, without affecting autophagy flux. Two top lead compounds induced autophagy and reduced axonal degeneration, thus promoting neuronal network maturation in the CMT2 patient-derived motor neurons. Based on these findings, the phenotypical screen revealed that piplartine rescued autophagy deficiencies in both the HSPB1 and HSPB8 models, demonstrating autophagy induction as an effective therapeutic strategy for CMT neuropathies and other chaperonopathies.</p>","PeriodicalId":93893,"journal":{"name":"Autophagy","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142855869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dynamic mitophagy trajectories hallmark brain aging.
Autophagy Pub Date : 2024-12-19 DOI: 10.1080/15548627.2024.2426115
Anna Rappe, Thomas G McWilliams
{"title":"Dynamic mitophagy trajectories hallmark brain aging.","authors":"Anna Rappe, Thomas G McWilliams","doi":"10.1080/15548627.2024.2426115","DOIUrl":"https://doi.org/10.1080/15548627.2024.2426115","url":null,"abstract":"<p><p>Studies using mitophagy reporter mice have established steady-state landscapes of mitochondrial destruction in mammalian tissues, sparking intense interest in basal mitophagy. Yet how basal mitophagy is modified by healthy aging in diverse brain cell types has remained a mystery. We present a comprehensive spatiotemporal analysis of mitophagy and macroautophagy dynamics in the aging mammalian brain, reporting critical region- and cell-specific turnover trajectories in a longitudinal study. We demonstrate that the physiological regulation of mitophagy in the mammalian brain is cell-specific, dynamic and complex. Mitophagy increases significantly in the cerebellum and hippocampus during midlife, while remaining unchanged in the prefrontal cortex (PFC). Conversely, macroautophagy decreases in the hippocampus and PFC, but remains stable in the cerebellum. We also describe emergent lysosomal heterogeneity, with subsets of differential acidified lysosomes accumulating in the aging brain. We further establish midlife as a critical inflection point for autophagy regulation, which may be important for region-specific vulnerability and resilience to aging. By mapping <i>in</i> <i>vivo</i> autophagy dynamics at the single cell level within projection neurons, interneurons and microglia, to astrocytes and secretory cells, we provide a new framework for understanding brain aging and offer potential targets and timepoints for further study and intervention in neurodegenerative diseases.</p>","PeriodicalId":93893,"journal":{"name":"Autophagy","volume":" ","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142856026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Blocking autophagosome closure manifests the roles of mammalian Atg8-family proteins in phagophore formation and expansion during nutrient starvation.
Autophagy Pub Date : 2024-12-18 DOI: 10.1080/15548627.2024.2443300
Van Bui, Xinwen Liang, Yansheng Ye, William Giang, Fang Tian, Yoshinori Takahashi, Hong-Gang Wang
{"title":"Blocking autophagosome closure manifests the roles of mammalian Atg8-family proteins in phagophore formation and expansion during nutrient starvation.","authors":"Van Bui, Xinwen Liang, Yansheng Ye, William Giang, Fang Tian, Yoshinori Takahashi, Hong-Gang Wang","doi":"10.1080/15548627.2024.2443300","DOIUrl":"https://doi.org/10.1080/15548627.2024.2443300","url":null,"abstract":"<p><p>Macroautophagy/autophagy, an evolutionarily conserved cellular degradation pathway, involves phagophores that sequester cytoplasmic constituents and mature into autophagosomes for subsequent lysosomal delivery. The <i>ATG8</i> gene family, comprising the <i>MAP1LC3/LC3</i> and <i>GABARAP/GBR</i> subfamilies in mammals, encodes ubiquitin-like proteins that are conjugated to phagophore membranes during autophagosome biogenesis. A central question in the field is how Atg8-family proteins are precisely involved in autophagosome formation, which remains controversial and challenging, at least in part due to the short lifespan of phagophores. In this study, we depleted the autophagosome closure regulator VPS37A to arrest autophagy at the vesicle completion step and determined the roles of mammalian Atg8-family proteins (mATG8s) in nutrient starvation-induced autophagosome biogenesis. Our investigation revealed that <i>LC3</i> loss hinders phagophore formation, while <i>GBR</i> loss impedes both phagophore formation and expansion. The defect in membrane expansion by <i>GBR</i> loss appears to be attributed to compromised recruitment of ATG proteins containing an LC3-interacting region (LIR), including ULK1 and ATG3. Moreover, a combined deficiency of both <i>LC3</i> and <i>GBR</i> subfamilies nearly completely inhibits phagophore formation, highlighting their redundant regulation of this process. Consequently, cells lacking all <i>mATG8</i> members exhibit defects in downstream events such as ESCRT recruitment and autophagic flux. Collectively, these findings underscore the critical roles of mammalian Atg8-family proteins in phagophore formation and expansion during autophagy.</p>","PeriodicalId":93893,"journal":{"name":"Autophagy","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142855871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
CKAP4 in hepatocellular carcinoma: competitive RETREG1/FAM134B binding, reticulophagy regulation, and cancer progression.
Autophagy Pub Date : 2024-12-17 DOI: 10.1080/15548627.2024.2435236
Jie Mo, Chen Su, Pengcheng Li, Zhenhua Yang, Ran Tao, Qiumeng Liu, Chaoyi Yuan, Lei Xu, Qianyun Ge, Deng Ning, Huifang Liang, Haidan Zhu, Yan Luo, Xiaoping Chen, Jin Chen, Bixiang Zhang
{"title":"CKAP4 in hepatocellular carcinoma: competitive RETREG1/FAM134B binding, reticulophagy regulation, and cancer progression.","authors":"Jie Mo, Chen Su, Pengcheng Li, Zhenhua Yang, Ran Tao, Qiumeng Liu, Chaoyi Yuan, Lei Xu, Qianyun Ge, Deng Ning, Huifang Liang, Haidan Zhu, Yan Luo, Xiaoping Chen, Jin Chen, Bixiang Zhang","doi":"10.1080/15548627.2024.2435236","DOIUrl":"https://doi.org/10.1080/15548627.2024.2435236","url":null,"abstract":"<p><p>RETREG1/FAM134B is known for its role as a reticulophagy receptor. Our previous study established that RETREG1 is upregulated in hepatocellular carcinoma (HCC) and contributes to disease progression by activating the AKT signaling pathway. However, the specific mechanisms underlying the elevated expression of RETREG1 in HCC remain unclear. This study unveils the interaction of RETREG1 with CKAP4 and TRIM21. We demonstrated that TRIM21 ubiquitinates RETREG1 at K247 and K252, facilitating its proteasomal degradation. Conversely, CKAP4 shields RETREG1 from degradation by competitively binding to it, revealing a novel post-translational modification mechanism for RETREG1. By modulating RETREG1 expression, CKAP4, and TRIM21 intricately regulate reticulophagy. Additionally, we observed that stress-induced TRIM21 upregulation mitigates the function of RETREG1 to restore ER stress equilibrium. The oncogenic potential of CKAP4 in HCC was demonstrated using various animal models. Clinical sample analyses suggested that CKAP4 is a potential biomarker for HCC prognosis and diagnosis.<b>Abbreviation</b>: AKT: thymoma viral proto-oncogene; aa: amino acid; bp: base pair; CHX: cycloheximide; co-IP: co-Immunoprecipitation; CQ: chloroquine; CKAP4: cytoskeleton-associated protein 4; DKK1: dickkopf WNT signaling pathway inhibitor 1; DUBs: deubiquitinating enzymes; EBSS: Earle's balanced salt solution; EGFP: enhanced green fluorescent protein; ER: endoplasmic reticulum; GAPDH: glyceraldehyde-3-phosphate dehydrogenase; GFP: green fluorescent protein; HCC: hepatocellular carcinoma; HFD: high-fat diet; HiTV: hyperdynamic tail vein injection; IF: immunofluorescence; IHC: immunohistochemistry; IP-MS: immunoprecipitation-mass spectrometry; LIR: LC3-interacting region; mAbs: monoclonal antibodies; MAP1LC3B/LC3B: microtubule-associated protein 1 light chain 3 beta; mCherry: monomeric cherry; oe: overexpression; PDX: patient-derived tumor xenograft; reticulophagy: endoplasmic reticulum selective autophagy; RETREG1: reticulophagy regulator 1; RHD: reticulon-homology domain; Tg: thapsigargin; Tm: tunicamycin; TRIM21: tripartite motif-containing 21; UB: ubiquitin; WT: wild-type.</p>","PeriodicalId":93893,"journal":{"name":"Autophagy","volume":" ","pages":"1-20"},"PeriodicalIF":0.0,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142848383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Endogenous interactomes of MFN1 and MFN2 provide novel insights into interorganelle communication and autophagy. MFN1和MFN2的内源相互作用组提供了关于细胞器间通讯和自噬的新见解。
Autophagy Pub Date : 2024-12-15 DOI: 10.1080/15548627.2024.2440843
Isabel Gordaliza-Alaguero, Paula Sànchez-Fernàndez-de-Landa, Dragana Radivojevikj, Laura Villarreal, Gianluca Arauz-Garofalo, Marina Gay, Marta Martinez-Vicente, Jorge Seco, Pau Martin-Malpartida, Marta Vilaseca, María J Macías, Manuel Palacin, Saška Ivanova, Antonio Zorzano
{"title":"Endogenous interactomes of MFN1 and MFN2 provide novel insights into interorganelle communication and autophagy.","authors":"Isabel Gordaliza-Alaguero, Paula Sànchez-Fernàndez-de-Landa, Dragana Radivojevikj, Laura Villarreal, Gianluca Arauz-Garofalo, Marina Gay, Marta Martinez-Vicente, Jorge Seco, Pau Martin-Malpartida, Marta Vilaseca, María J Macías, Manuel Palacin, Saška Ivanova, Antonio Zorzano","doi":"10.1080/15548627.2024.2440843","DOIUrl":"https://doi.org/10.1080/15548627.2024.2440843","url":null,"abstract":"<p><p>MFN1 (mitofusin 1) and MFN2 are key players in mitochondrial fusion, endoplasmic reticulum (ER)-mitochondria juxtaposition, and macroautophagy/autophagy. However, the mechanisms by which these proteins participate in these processes are poorly understood. Here, we studied the interactomes of these two proteins by using CRISPR-Cas9 technology to insert an HA-tag at the C terminus of MFN1 and MFN2, and thus generating HeLa cell lines that endogenously expressed MFN1-HA or MFN2-HA. HA-affinity isolation followed by mass spectrometry identified potential interactors of MFN1 and MFN2. A substantial proportion of interactors were common for MFN1 and MFN2 and were regulated by nutrient deprivation. We validated novel ER and endosomal partners of MFN1 and/or MFN2 with a potential role in interorganelle communication. We characterized RAB5C (RAB5C, member RAS oncogene family) as an endosomal modulator of mitochondrial homeostasis, and SLC27A2 (solute carrier family 27 (fatty acid transporter), member 2) as a novel partner of MFN2 relevant in autophagy. We conclude that MFN proteins participate in nutrient-modulated pathways involved in organelle communication and autophagy.</p>","PeriodicalId":93893,"journal":{"name":"Autophagy","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142831044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Restoration of lysosomal function attenuates autophagic flux impairment in nucleus pulposus cells and protects against mechanical overloading-induced intervertebral disc degeneration. 恢复溶酶体功能可减轻髓核细胞的自噬通量损伤,防止机械过载引起的椎间盘退化。
Autophagy Pub Date : 2024-12-15 DOI: 10.1080/15548627.2024.2440844
Sheng Liu, Yiqiang Hu, Weihua Xu, Weijian Liu, Bingjin Wang, Xianlin Zeng, Zengwu Shao, Cao Yang, Liming Xiong, Xianyi Cai
{"title":"Restoration of lysosomal function attenuates autophagic flux impairment in nucleus pulposus cells and protects against mechanical overloading-induced intervertebral disc degeneration.","authors":"Sheng Liu, Yiqiang Hu, Weihua Xu, Weijian Liu, Bingjin Wang, Xianlin Zeng, Zengwu Shao, Cao Yang, Liming Xiong, Xianyi Cai","doi":"10.1080/15548627.2024.2440844","DOIUrl":"https://doi.org/10.1080/15548627.2024.2440844","url":null,"abstract":"<p><p>Intervertebral disc degeneration (IVDD) is a leading cause of low back pain that incurs large socioeconomic burdens. Growing evidence reveals that macroautophagy/autophagy dysregulation contributes to IVDD, but the exact role of autophagy and its regulatory mechanisms remain largely unknown. Here, we found that mechanical overloading impaired the autophagic flux of nucleus pulposus (NP) cells <i>in vivo</i> and <i>in vitro</i>. Mechanistically, the impairment of autophagic flux was attributed to lysosomal dysfunction induced by overloading. Overloading could also lead to lysosomal membrane permeabilization and consequent lysosome-dependent cell death. As critical effectors of lysosomal quality control pathways, CHMP4B (charged multivesicular body protein 4B) and TFEB (transcription factor EB) were downregulated in overloading-treated NP cells and degenerative discs. Restoring lysosomal function by CHMP4B or TFEB overexpression attenuated autophagic flux impairment of NP cells and protected against overloading-induced IVDD. Additionally, human IVDD was associated with impaired autophagy, and defective lysosomal quality control was also linked to human IVDD. Collectively, these findings highlighted that lysosomal defects were crucial for mechanical overloading-induced autophagic flux impairment and death of NP cells, suggesting the potential therapeutic relevance of restoring lysosomal function for IVDD.</p>","PeriodicalId":93893,"journal":{"name":"Autophagy","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142831072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Mycobacterium tuberculosis lipid, PDIM, inhibits the NADPH oxidase and autophagy.
Autophagy Pub Date : 2024-12-15 DOI: 10.1080/15548627.2024.2439928
Ekansh Mittal, Jennifer A Philips
{"title":"The <i>Mycobacterium tuberculosis</i> lipid, PDIM, inhibits the NADPH oxidase and autophagy.","authors":"Ekansh Mittal, Jennifer A Philips","doi":"10.1080/15548627.2024.2439928","DOIUrl":"10.1080/15548627.2024.2439928","url":null,"abstract":"<p><p><i>Mycobacterium tuberculosis</i> (Mtb), the etiological agent of tuberculosis (TB), remains a significant global health challenge. Mtb is transmitted by respiratory aerosols and infects a variety of myeloid populations. Our recent study shows that the Mtb virulence lipid phthiocerol dimycocerosate (PDIM) promotes the intracellular survival of Mtb in macrophages by inhibiting NADPH oxidase, thereby impairing LC3-associated phagocytosis, and in vivo PDIM also antagonizes canonical macroautophagy/autophagy. In addition, mice defective in autophagy in myeloid cells fail to develop B-cell follicles in the lungs during chronic infection. Here, we present a summary of our recent publication, highlighting the most significant findings and discussing how they provide new insight into the role of autophagy and the diversity of lung myeloid cells in the pathogenesis of Mtb.</p>","PeriodicalId":93893,"journal":{"name":"Autophagy","volume":" ","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142815080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
AMPK protects proximal tubular epithelial cells from lysosomal dysfunction and dedifferentiation induced by lipotoxicity.
Autophagy Pub Date : 2024-12-15 DOI: 10.1080/15548627.2024.2435238
Louise Pierre, Florian Juszczak, Valentine Delmotte, Morgane Decarnoncle, Benjamin Ledoux, Laurent Bultot, Luc Bertrand, Marielle Boonen, Patricia Renard, Thierry Arnould, Anne-Emilie Declèves
{"title":"AMPK protects proximal tubular epithelial cells from lysosomal dysfunction and dedifferentiation induced by lipotoxicity.","authors":"Louise Pierre, Florian Juszczak, Valentine Delmotte, Morgane Decarnoncle, Benjamin Ledoux, Laurent Bultot, Luc Bertrand, Marielle Boonen, Patricia Renard, Thierry Arnould, Anne-Emilie Declèves","doi":"10.1080/15548627.2024.2435238","DOIUrl":"https://doi.org/10.1080/15548627.2024.2435238","url":null,"abstract":"&lt;p&gt;&lt;p&gt;Renal proximal tubules are a primary site of injury in metabolic diseases. In obese patients and animal models, proximal tubular epithelial cells (PTECs) display dysregulated lipid metabolism, organelle dysfunctions, and oxidative stress that contribute to interstitial inflammation, fibrosis and ultimately end-stage renal failure. Our research group previously pointed out AMP-activated protein kinase (AMPK) decline as a driver of obesity-induced renal disease. Because PTECs display high macroautophagic/autophagic activity and rely heavily on their endo-lysosomal system, we investigated the effect of lipid stress on autophagic flux and lysosomes in these cells. Using a model of highly differentiated primary PTECs challenged with palmitate, our data placed lysosomes at the cornerstone of the lipotoxic phenotype. As soon as 6 h after palmitate exposure, cells displayed impaired lysosomal acidification subsequently leading to autophagosome accumulation and activation of lysosomal biogenesis. We also showed the inability of lysosomal quality control to restore acidic pH which finally drove PTECs dedifferentiation. When palmitate-induced AMPK activity decline was prevented by AMPK activators, lysosomal acidification and the differentiation profile of PTECs were preserved. Our work provided key insights on the importance of lysosomes in PTECs homeostasis and lipotoxicity and demonstrated the potential of AMPK in protecting the organelle from lipid stress.&lt;b&gt;Abbreviation&lt;/b&gt;: ACAC: acetyl-CoA carboxylase; ACTB: actin beta; AICAR: 5-aminoimidazole-4-carboxamide-1-β-D-ribofuranoside; AMPK: AMP-activated protein kinase; APQ1: aquaporin 1 (Colton blood group); BSA: bovine serum albumin; CDH16: cadherin 16; CKD: chronic kidney disease; CTSB: cathepsin B; CTSD: cathepsin D; EPB41L5: erythrocyte membrane protein band 4.1 like 5; EIF4EBP1: eukaryotic translation initiation factor 4E binding protein 1; EMT: epithelial-to-mesenchymal transition; FA: fatty acid; FCCP: carbonyl cyanide 4-(trifluoromethoxy)phenylhydrazone; GFP: green fluorescent protein; GUSB: glucuronidase beta; HEXB: hexosaminidase subunit beta; LAMP: lysosomal associated membrane protein; LD: lipid droplet; LGALS3: galectin 3; LLOMe: L-leucyl-L-leucine methyl ester hydrobromide; LMP: lysosomal membrane permeabilization; LRP2: LDL receptor related protein 2; LSD: lysosomal storage disorder; MAP1LC3/LC3: microtubule associated protein 1 light chain 3; MCOLN1: mucolipin TRP cation channel 1; MG132: N-benzyloxycarbonyl-L-leucyl-L-leucyl-L-leucinal; MmPTECs: Mus musculus (mouse) proximal tubular epithelial cells; MTORC1: mechanistic target of rapamycin kinase complex 1; OA: oleate; PA: palmitate; PIKFYVE: phosphoinositide kinase, FYVE-type zinc finger containing; PTs: proximal tubules; PTECs: proximal tubular epithelial cells; PRKAA: protein kinase AMP-activated catalytic subunit alpha; RFP: red fluorescent protein; RPS6KB: ribosomal protein S6 kinase B; SLC5A2: solute carrier family 5 member 2; ","PeriodicalId":93893,"journal":{"name":"Autophagy","volume":" ","pages":"1-21"},"PeriodicalIF":0.0,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142831025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Autophagy as a way to remove DNA lesions.
Autophagy Pub Date : 2024-12-15 DOI: 10.1080/15548627.2024.2434784
Yuchen Lei, Daniel J Klionsky
{"title":"Autophagy as a way to remove DNA lesions.","authors":"Yuchen Lei, Daniel J Klionsky","doi":"10.1080/15548627.2024.2434784","DOIUrl":"10.1080/15548627.2024.2434784","url":null,"abstract":"<p><p>Type I topoisomerases (TOP1) are critical to remove the topological stress when DNA double strands are unwound. The TOP1 cleavage complexes (TOP1cc) are normally transient, and the stabilization of TOP1cc by its inhibitors, such as camptothecin (CPT), may lead to DNA damage and become cytotoxic. The proteasome pathway degrades trapped TOP1, which is necessary for the repair machinery to gain access to the DNA; however, this process is mainly described when the CPT concentration is high, at levels which are clinically unachievable. In a recently published study, Lascaux et al. identify macroautophagy/autophagy as a new pathway to remove DNA lesions upon clinically relevant low-dose CPT treatment. The autophagy receptor TEX264 binds to TOP1 and brings this protein and its bound DNA fragments to the phagophore; subsequently, they are ultimately delivered to the lysosome for degradation. This study demonstrates the role of autophagy in maintaining genome stability from a new perspective and reveals potential targets to deal with the resistance to TOP1cc inhibitors during cancer treatment.</p>","PeriodicalId":93893,"journal":{"name":"Autophagy","volume":" ","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142787924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信