Autophagy最新文献

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Integrating bioengineering, super-resolution microscopy and mechanobiology in autophagy research: addendum to the guidelines (4th edition). 在自噬研究中整合生物工程、超分辨率显微镜和机械生物学:指南增编(第 4 版)。
Autophagy Pub Date : 2025-03-01 Epub Date: 2024-07-20 DOI: 10.1080/15548627.2024.2379065
Andrea Ravasio, Daniel J Klionsky, Cristina Bertocchi
{"title":"Integrating bioengineering, super-resolution microscopy and mechanobiology in autophagy research: addendum to the guidelines (4th edition).","authors":"Andrea Ravasio, Daniel J Klionsky, Cristina Bertocchi","doi":"10.1080/15548627.2024.2379065","DOIUrl":"10.1080/15548627.2024.2379065","url":null,"abstract":"<p><p>Recent key technological developments, such as super-resolution microscopy and microfabrication, enabled investigation of biological processes, including macroautophagy/autophagy, with unprecedented spatiotemporal resolution and control over experimental conditions. Such disruptive innovations deepened our capability to provide mechanistic understandings of the autophagic process and its causes. This addendum aims to expand the guidelines on autophagy in three key directions: optical methods enabling visualization of autophagic machinery beyond the diffraction-limited resolution; bioengineering enabling accurate designs and control over experimental conditions; and theoretical advances in mechanobiology connecting autophagy and mechanical processes of the cell. <b>Abbreviation:</b> 3D: three-dimensional; SIM: structured illumination microscopy; STORM: stochastic optical reconstruction microscopy.</p>","PeriodicalId":93893,"journal":{"name":"Autophagy","volume":" ","pages":"674-677"},"PeriodicalIF":0.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11849944/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141731696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
ATP6V1D drives hepatocellular carcinoma stemness and progression via both lysosome acidification-dependent and -independent mechanisms. ATP6V1D 通过溶酶体酸化依赖性和非依赖性机制驱动肝细胞癌的干性和进展。
Autophagy Pub Date : 2025-03-01 Epub Date: 2024-10-10 DOI: 10.1080/15548627.2024.2406186
Zhijie Xu, Ruiyang Liu, Haoying Ke, Fuyuan Xu, Pengfei Yang, Weiyu Zhang, Yi Zhan, Zhiju Zhao, Fei Xiao
{"title":"ATP6V1D drives hepatocellular carcinoma stemness and progression via both lysosome acidification-dependent and -independent mechanisms.","authors":"Zhijie Xu, Ruiyang Liu, Haoying Ke, Fuyuan Xu, Pengfei Yang, Weiyu Zhang, Yi Zhan, Zhiju Zhao, Fei Xiao","doi":"10.1080/15548627.2024.2406186","DOIUrl":"10.1080/15548627.2024.2406186","url":null,"abstract":"<p><p>Metabolic reprogramming is pivotal in cancer stem cell (CSC) self-renewal. However, the intricate regulatory mechanisms governing the crosstalk between metabolic reprogramming and liver CSCs remain elusive. Here, using a metabolic CRISPR-Cas9 knockout screen, we identify ATP6V1D, a subunit of the vacuolar-type H<sup>+</sup>-translocating ATPase (V-ATPase), as a key metabolic regulator of hepatocellular carcinoma (HCC) stemness. Elevated ATP6V1D expression correlates with poor clinical outcomes in HCC patients. ATP6V1D knockdown inhibits HCC stemness and malignant progression both <i>in vitro</i> and <i>in vivo</i>. Mechanistically, ATP6V1D enhances HCC stemness and progression by maintaining macroautophagic/autophagic flux. Specifically, ATP6V1D not only promotes lysosomal acidification, but also enhances the interaction between CHMP4B and IST1 to foster ESCRT-III complex assembly, thereby facilitating autophagosome-lysosome fusion to maintain autophagic flux. Moreover, silencing CHMP4B or IST1 attenuates HCC stemness and progression. Notably, low-dose bafilomycin A<sub>1</sub> targeting the V-ATPase complex shows promise as a potential therapeutic strategy for HCC. In conclusion, our study highlights the critical role of ATP6V1D in driving HCC stemness and progression via the autophagy-lysosomal pathway, providing novel therapeutic targets and approaches for HCC treatment.<b>Abbreviations:</b> 3-MA: 3-methyladenine; ANT: adjacent normal liver tissues; ATP6V1D: ATPase H+ transporting V1 subunit D; BafA1: bafilomycin A<sub>1</sub>; CHMP: charged multivesicular body protein; co-IP: co-immunoprecipitation; CSC: cancer stem cell; ESCRT: endosomal sorting complex required for transport; HCC: hepatocellular carcinoma; IF: immunofluorescence; IHC: immunohistochemical; LCSCs: liver cancer stem cells; qRT-PCR: quantitative real time PCR; V-ATPase: vacuolar-type H<sup>+</sup>- translocating ATPase; WB: western blot.</p>","PeriodicalId":93893,"journal":{"name":"Autophagy","volume":" ","pages":"513-529"},"PeriodicalIF":0.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11849949/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142334256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Autophagy modulates male fertility in Arabidopsis. 自噬调节拟南芥雄性生殖能力。
Autophagy Pub Date : 2025-03-01 Epub Date: 2024-12-30 DOI: 10.1080/15548627.2024.2441305
Zhen Lu, He Yan, Hao Wang
{"title":"Autophagy modulates male fertility in Arabidopsis.","authors":"Zhen Lu, He Yan, Hao Wang","doi":"10.1080/15548627.2024.2441305","DOIUrl":"10.1080/15548627.2024.2441305","url":null,"abstract":"<p><p>Macroautophagy/autophagy is a highly conserved catabolic process in eukaryotes and plays pivotal roles in regulating male fertility and sexual reproduction. In metazoans, mutations in core ATG (autophagy related) proteins frequently result in severe defects in sperm formation and maturation, resulting in male sterility. In contrast, autophagy has traditionally been considered dispensable for reproduction in <i>Arabidopsis thaliana</i>, as most <i>atg</i> mutants can complete fertilization and produce viable progeny without apparent reproductive defects. We recently systematically re-assessed the role of autophagy in Arabidopsis male gametophyte development and fertility using <i>atg5</i> and <i>atg7</i> mutants, and the double mutant. These mutants exhibited partial defects in pollen germination, pollen tube growth and seed production compared to the wild type (WT). Furthermore, our findings reveal that autophagy is essential for modulating actin dynamic organization during sperm cell formation within pollen grains and for supporting pollen tube elongation. This is achieved through the selective degradation of actin depolymerizing factors ADF7 and PFN2/Profilin2. NBR1 is identified as a key receptor mediating this process. This study provides valuable insights into the evolutionary conservation and functional divergence of autophagy in modulating male fertility, highlighting distinctions between plant and mammalian systems.</p>","PeriodicalId":93893,"journal":{"name":"Autophagy","volume":" ","pages":"686-688"},"PeriodicalIF":0.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11849951/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142814957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Deciphering melanophagy: role of the PTK2-ITCH-MLANA-OPTN cascade on melanophagy in melanocytes. 解密黑色素吞噬:PTK2-ITCH-MLANA-OPTN 级联在黑色素细胞黑色素吞噬中的作用。
Autophagy Pub Date : 2025-03-01 Epub Date: 2024-11-12 DOI: 10.1080/15548627.2024.2421695
Na Yeon Park, Doo Sin Jo, Hyun Jun Park, Ji-Eun Bae, Yong Hwan Kim, Joon Bum Kim, Ha Jung Lee, Sung Hyun Kim, Hyunjung Choi, Hyun-Shik Lee, Tamotsu Yoshimori, Dong-Seok Lee, Jin-A Lee, Pansoo Kim, Dong-Hyung Cho
{"title":"Deciphering melanophagy: role of the PTK2-ITCH-MLANA-OPTN cascade on melanophagy in melanocytes.","authors":"Na Yeon Park, Doo Sin Jo, Hyun Jun Park, Ji-Eun Bae, Yong Hwan Kim, Joon Bum Kim, Ha Jung Lee, Sung Hyun Kim, Hyunjung Choi, Hyun-Shik Lee, Tamotsu Yoshimori, Dong-Seok Lee, Jin-A Lee, Pansoo Kim, Dong-Hyung Cho","doi":"10.1080/15548627.2024.2421695","DOIUrl":"10.1080/15548627.2024.2421695","url":null,"abstract":"<p><p>Melanosomes play a pivotal role in skin color and photoprotection. In contrast to the well-elucidated pathway of melanosome biogenesis, the process of melanosome degradation, referred to as melanophagy, is largely unexplored. Previously, we discovered that 3,4,5-trimethoxycinnamate thymol ester (TCTE) effectively inhibits skin pigmentation by activating melanophagy. In this study, we discovered a new regulatory signaling cascade that controls melanophagy in TCTE-treated melanocytes. ITCH (itchy E3 ubiquitin protein ligase) facilitates ubiquitination of the melanosome membrane protein MLANA (melan-A) during TCTE-induced melanophagy. This ubiquitinated MLANA is then recognized by an autophagy receptor protein, OPTN (optineurin). Additionally, a phospho-kinase antibody array revealed that TCTE activates PTK2 (protein tyrosine kinase 2), which phosphorylates ITCH, enhancing the ubiquitination of MLANA. Furthermore, inhibition of either PTK2 or ITCH disrupts the ubiquitination of MLANA and the MLANA-OPTN interaction in TCTE-treated cells. Taken together, our findings highlight the critical role of the PTK2-ITCH-MLANA-OPTN cascade in orchestrating melanophagy progression.<b>Abbreviations</b>: α-MSH: alpha-melanocyte-stimulating hormone; dichlone: 2,3-dichloro-1,4-naphthoquinone; ITCH: itchy E3 ubiquitin protein ligase; MITF: melanocyte inducing transcription factor; MLANA: melan-A; NBR1: NBR1 autophagy cargo receptor; OPTN: optineurin; PINK1: PTEN induced kinase 1; PTK2: protein tyrosine kinase 2; SQSTM1/p62: sequestosome 1; TCTE: 3,4,5-trimethoxycinnamate thymol ester; TPC2: two pore segment channel 2; VDAC1: voltage dependent anion channel 1.</p>","PeriodicalId":93893,"journal":{"name":"Autophagy","volume":" ","pages":"664-673"},"PeriodicalIF":0.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11849925/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142549513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Janus-like behavior of intrinsically disordered regions in reticulophagy. 网状吞噬中内在无序区域的双面样行为。
Autophagy Pub Date : 2025-03-01 Epub Date: 2025-01-03 DOI: 10.1080/15548627.2024.2437652
Sergio Alejandro Poveda-Cuevas, Kateryna Lohachova, Borna Markusic, Ivan Dikic, Gerhard Hummer, Ramachandra M Bhaskara
{"title":"Janus-like behavior of intrinsically disordered regions in reticulophagy.","authors":"Sergio Alejandro Poveda-Cuevas, Kateryna Lohachova, Borna Markusic, Ivan Dikic, Gerhard Hummer, Ramachandra M Bhaskara","doi":"10.1080/15548627.2024.2437652","DOIUrl":"10.1080/15548627.2024.2437652","url":null,"abstract":"<p><p>Intrinsically disordered regions (IDRs) are crucial to homeostatic and organellar remodeling pathways. In reticulophagy/ER-phagy, long cytosolic IDR-containing receptors (e.g. RETREG1/FAM134B) house the LC3-interacting region (LIR) motif to recruit the phagophore. The precise functions of the IDR beyond engaging the autophagic machinery are unclear. Here, we comment on the role of the RETREG1-IDR based on our recent computer modeling and molecular dynamics (MD) simulations. Extensive analysis of the RETREG1-IDR indicates a continuum of conformations between expanded and compact structures, displaying a Janus-like feature. Using an adapted MARTINI model, we find that the IDR ensemble properties vary widely depending on the membrane anchor. IDRs alone are sufficient to promote and sense membrane curvature and can act as entropic tethers. When anchored to the Reticulon homology domain (RHD), they adopt compact collapsed conformations, acting as effector scaffolds that amplify RHD membrane remodeling properties, enhancing receptor-clustering and accelerating spontaneous budding. These findings expand the operational scope of IDRs within reticulophagy, offering fresh insights into a mechanistic understanding of membrane remodeling.</p>","PeriodicalId":93893,"journal":{"name":"Autophagy","volume":" ","pages":"681-683"},"PeriodicalIF":0.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11849913/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142804080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","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. 结核分枝杆菌脂质,PDIM,抑制NADPH氧化酶和自噬。
Autophagy Pub Date : 2025-03-01 Epub 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":"684-685"},"PeriodicalIF":0.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11849942/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142815080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Correction. 修正。
Autophagy Pub Date : 2025-03-01 Epub Date: 2025-01-15 DOI: 10.1080/15548627.2024.2431342
{"title":"Correction.","authors":"","doi":"10.1080/15548627.2024.2431342","DOIUrl":"10.1080/15548627.2024.2431342","url":null,"abstract":"","PeriodicalId":93893,"journal":{"name":"Autophagy","volume":" ","pages":"iii"},"PeriodicalIF":0.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11849914/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143018066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Copper aggravated synaptic damage after traumatic brain injury by downregulating BNIP3-mediated mitophagy. 铜通过下调 BNIP3 介导的有丝分裂,加剧了创伤性脑损伤后的突触损伤。
Autophagy Pub Date : 2025-03-01 Epub Date: 2024-10-16 DOI: 10.1080/15548627.2024.2409613
Hanxiao Chang, Weiwei Zhang, Lei Xu, Zheng Li, Chao Lin, Yuqi Shen, Guangjian Zhang, Lei Mao, Chencheng Ma, Ning Liu, Hua Lu
{"title":"Copper aggravated synaptic damage after traumatic brain injury by downregulating BNIP3-mediated mitophagy.","authors":"Hanxiao Chang, Weiwei Zhang, Lei Xu, Zheng Li, Chao Lin, Yuqi Shen, Guangjian Zhang, Lei Mao, Chencheng Ma, Ning Liu, Hua Lu","doi":"10.1080/15548627.2024.2409613","DOIUrl":"10.1080/15548627.2024.2409613","url":null,"abstract":"<p><p>Synaptic damage is a crucial pathological process in traumatic brain injury. However, the mechanisms driving this process remain poorly understood. In this report, we demonstrate that the accumulation of damaged mitochondria, resulting from impaired mitphagy, plays a significant role in causing synaptic damage. Moreover, copper induced downregulation of BNIP3 is a key player in regulating mitophagy. DMSA alleviates synaptic damage and mitochondrial dysfunction by promoting urinary excretion of copper. Mechanistically, we find that copper downregulate BNIP3 by increasing the nuclear translocation of NFKB, which is triggered by TRIM25-mediated ubiquitination-dependent degradation of NFKBIA. Our study underscores the importance of copper accumulation in the regulation of BNIP3-mediated mitophagy and suggests that therapeutic targeting of the copper-TRIM25-NFKB-BNIP3 axis holds promise to attenuate synaptic damage after traumatic brain injury.</p>","PeriodicalId":93893,"journal":{"name":"Autophagy","volume":" ","pages":"548-564"},"PeriodicalIF":0.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11849941/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142482855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
SMURF1 mediates damaged lysosomal homeostasis by ubiquitinating PPP3CB to promote the activation of TFEB. SMURF1 通过泛素化 PPP3CB 来促进 TFEB 的活化,从而介导受损溶酶体的稳态。
Autophagy Pub Date : 2025-03-01 Epub Date: 2024-10-14 DOI: 10.1080/15548627.2024.2407709
Qin Xia, Xuan Liu, Lu Zhong, Jun Qu, Lei Dong
{"title":"SMURF1 mediates damaged lysosomal homeostasis by ubiquitinating PPP3CB to promote the activation of TFEB.","authors":"Qin Xia, Xuan Liu, Lu Zhong, Jun Qu, Lei Dong","doi":"10.1080/15548627.2024.2407709","DOIUrl":"10.1080/15548627.2024.2407709","url":null,"abstract":"<p><p>The calcium-activated phosphatase PPP3/calcineurin dephosphorylates TFEB (transcription factor EB) to trigger its nuclear translocation and the activation of macroautophagic/autophagic targets. However, the detailed molecular mechanism regulating TFEB activation remains poorly understood. Here, we highlighted the importance of SMURF1 (SMAD specific E3 ubiquitin protein ligase 1) in the activation of TFEB for lysosomal homeostasis. SMURF1 deficiency prevents the calcium-triggered ubiquitination of the catalytic subunit of PPP3/calcineurin in a manner consistent with defective autophagic degradation of damaged lysosomes. Mechanically, PPP3CB/CNA2 plays a bridging role in the recruitment of SMURF1 by LGALS3 (galectin 3) upon lysosome damage. Importantly, PPP3CB increases the dissociation of the N-terminal tail (NT) and C-terminal carbohydrate-recognition domain (CRD) of LGALS3, which may promote the formation of open conformers in a PPP3CB dephosphorylation activity-dependent manner. In addition, PPP3CB is ubiquitinated at lysine 146 by the recruited SMURF1 in response to intracellular calcium stimulation. The K63-linked ubiquitination of PPP3CB enhances the recruitment of TFEB. Moreover, TFEB directly interacts with both PPP3CB and the regulatory subunit PPP3R1 which facilitate the conformational correction of TFEB for its activation for the transcription of TFEB-targeted genes. Altogether, our results highlighted a critical mechanism for the regulation of PPP3/calcineurin activity via its ubiquitin ligase SMURF1 in response to lysosomal membrane damage, which may account for a potential target for the treatment of stress-related diseases.<b>Abbreviation</b> AID: autoinhibitory domain; ATG: autophagy related; CD: catalytic domain; CRD: carbohydrate-recognition domain; CsA: cyclosporin A; DMSO: dimethyl sulfoxide; ESCRT: endosomal sorting complexes required for transport; GSK3B: glycogen synthase kinase 3 beta; LAMP1: lysosomal associated membrane protein 1; LGALS3: galectin 3; LLOMe: L-leucyl-L-leucine methyl ester; MAP1LC3/LC3: microtubule associated protein 1 light chain 3; ML-SA1: mucolipin synthetic agonist 1; MTORC1: mechanistic target of rapamycin kinase complex 1; NT: N-terminal tail; PPP3CB: protein phosphatase 3 catalytic subunit beta; PPP3R1: protein phosphatase 3 regulatory subunit B, alpha; SMURF1: SMAD specific E3 ubiquitin protein ligase 1; SQSTM1/p62: sequestosome 1; TFEB: transcription factor EB; VCP/p97: valosin containing protein; YWHA/14-3-3: tyrosine 3-monooxygenase/tryptophan 5-monooxygenase activation protein.</p>","PeriodicalId":93893,"journal":{"name":"Autophagy","volume":" ","pages":"530-547"},"PeriodicalIF":0.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11849922/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142334260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A novel ER stress regulator ARL6IP5 induces reticulophagy to ameliorate the prion burden. 新型ER应激调节因子ARL6IP5可诱导网状吞噬作用,从而减轻朊病毒的负担。
Autophagy Pub Date : 2025-03-01 Epub Date: 2024-10-24 DOI: 10.1080/15548627.2024.2410670
Kajal Kamble, Ujjwal Kumar, Harsh Aahra, Mohit Yadav, Sumnil Bhola, Sarika Gupta
{"title":"A novel ER stress regulator ARL6IP5 induces reticulophagy to ameliorate the prion burden.","authors":"Kajal Kamble, Ujjwal Kumar, Harsh Aahra, Mohit Yadav, Sumnil Bhola, Sarika Gupta","doi":"10.1080/15548627.2024.2410670","DOIUrl":"10.1080/15548627.2024.2410670","url":null,"abstract":"<p><p>Prion disease is a fatal and infectious neurodegenerative disorder caused by the trans-conformation conversion of PRNP/PrP<sup>C</sup> to PRNP/PrP<sup>Sc</sup>. Accumulated PRNP/PrP<sup>Sc</sup>-induced ER stress causes chronic unfolded protein response (UPR) activation, which is one of the fundamental steps in prion disease progression. However, the role of various ER-resident proteins in prion-induced ER stress is elusive. This study demonstrated that ARL6IP5 is compensatory upregulated in response to chronically activated UPR in the cellular prion disease model (RML-ScN2a). Furthermore, overexpression of ARL6IP5 overcomes ER stress by lowering the expression of chronically activated UPR pathway proteins. We discovered that ARL6IP5 induces reticulophagy to reduce the PRNP/PrP<sup>Sc</sup> burden by releasing ER stress. Conversely, the knockdown of ARL6IP5 leads to inefficient macroautophagic/autophagic flux and elevated PRNP/PrP<sup>Sc</sup> burden. Our study also uncovered that ARL6IP5-induced reticulophagy depends on Ca<sup>2+</sup>-mediated AMPK activation and can induce 3 MA-inhibited autophagic flux. The detailed mechanistic study revealed that ARL6IP5-induced reticulophagy involves interaction with soluble reticulophagy receptor CALCOCO1 and lysosomal marker LAMP1, leading to degradation in lysosomes. Here, we delineate the role of ARL6IP5 as a novel ER stress regulator and reticulophagy inducer that can effectively reduce the misfolded PRNP/PrP<sup>Sc</sup> burden. Our research opens up a new avenue of selective autophagy in prion disease and represents a potential therapeutic target.<b>Abbreviations</b>: ARL6IP5: ADP ribosylation factor-like GTPase 6 interacting protein 5; AMPK: adenosine 5'-monophosphate (AMP)-activated protein kinase; CALCOCO1: calcium binding and coiled-coil domain 1; CQ: chloroquine; DAPI: 4'6-diamino-2-phenylindole; ER: endoplasmic reticulum; ERPHS: reticulophagy/ER-phagy sites; KD: knockdown; KD-CON: knockdown control; LAMP1: lysosomal-associated membrane protein 1; MAP1LC3/LC3, microtubule-associated protein 1 light chain 3; MTOR: mechanistic target of rapamycin kinase; MβCD: methyl beta cyclodextrin; 3 MA: 3-methyladenine; OE: overexpression; OE-CON: empty vector control; PrDs: prion diseases; PRNP/PrP<sup>C</sup>: cellular prion protein (Kanno blood group); PRNP/PrP<sup>Sc</sup>: infectious scrapie misfolded PRNP; Tm: tunicamycin; UPR: unfolded protein response; UPS: ubiquitin-proteasome system.</p>","PeriodicalId":93893,"journal":{"name":"Autophagy","volume":" ","pages":"598-618"},"PeriodicalIF":0.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11849938/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142482851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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