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Podocytes maintain high basal levels of autophagy independent of mtor signaling

Identifieur interne : 000005 ( Hal/Checkpoint ); précédent : 000004; suivant : 000006

Podocytes maintain high basal levels of autophagy independent of mtor signaling

Auteurs : Tillmann Bork [Allemagne] ; Wei Liang [Allemagne] ; Kosuke Yamahara [Allemagne] ; Philipp Lee [Allemagne] ; Zhejia Tian [Allemagne] ; Shuya Liu [Allemagne] ; Christoph Schell [Allemagne] ; Kathrin Thedieck [Autriche] ; Bjoern Hartleben [Allemagne] ; Ketan Patel [Allemagne] ; Pierre-Louis Tharaux [France] ; Olivia Lenoir [France] ; Tobias Huber [Allemagne]

Source :

RBID : Hal:inserm-02439016

English descriptors

Abstract

While constant basal levels of macroautophagy/autophagy are a prerequisite to preserve long-lived podocytes at the filtration barrier, MTOR regulates at the same time podocyte size and compensatory hypertrophy. Since MTOR is known to generally suppress autophagy, the apparently independent regulation of these two key pathways of glomerular maintenance remained puzzling. We now report that long-term genetic manipulation of MTOR activity does in fact not influence high basal levels of autophagy in podocytes either in vitro or in vivo. Instead we present data showing that autophagy in podocytes is mainly controlled by AMP-activated protein kinase (AMPK) and ULK1 (unc-51 like kinase 1). Pharmacological inhibition of MTOR further shows that the uncoupling of MTOR activity and autophagy is time dependent. Together, our data reveal a novel and unexpected cell-specific mechanism, which permits concurrent MTOR activity as well as high basal autophagy rates in podocytes. Thus, these data indicate manipulation of the AMPK-ULK1 axis rather than inhibition of MTOR as a promising therapeutic intervention to enhance autophagy and preserve podocyte homeostasis in glomerular diseases.Abbreviations: AICAR: 5-aminoimidazole-4-carboxamide ribonucleotide; AMPK: AMP-activated protein kinase; ATG: autophagy related; BW: body weight; Cq: chloroquine; ER: endoplasmic reticulum; ESRD: end stage renal disease; FACS: fluorescence activated cell sorting; GFP: green fluorescent protein; i.p.: intra peritoneal; MAP1LC3/LC3: microtubule-associated protein 1 light chain 3; MTOR: mechanistic target of rapamycin kinase; NPHS1: nephrosis 1, nephrin; NPHS2: nephrosis 2, podocin; PLA: proximity-ligation assay; PRKAA: 5'-AMP-activated protein kinase catalytic subunit alpha; RPTOR/RAPTOR: regulatory associated protein of MTOR, complex 1; RFP: red fluorescent protein; TSC1: tuberous sclerosis 1; ULK1: unc-51 like kinase 1.


Url:
DOI: 10.1080/15548627.2019.1705007

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Hal:inserm-02439016

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<idno type="DOI">10.1080/15548627.2019.1705007</idno>
<series>
<title level="j">Autophagy</title>
<idno type="ISSN">1554-8627</idno>
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<date type="datePub">2019-12</date>
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<term>AMPK</term>
<term>LC3</term>
<term>MTOR</term>
<term>Raptor</term>
<term>Tsc1</term>
<term>autophagy</term>
<term>glomerulus</term>
<term>kidney</term>
<term>podocyte</term>
<term>rapamycin</term>
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<div type="abstract" xml:lang="en">
<p>While constant basal levels of macroautophagy/autophagy are a prerequisite to preserve long-lived podocytes at the filtration barrier, MTOR regulates at the same time podocyte size and compensatory hypertrophy. Since MTOR is known to generally suppress autophagy, the apparently independent regulation of these two key pathways of glomerular maintenance remained puzzling. We now report that long-term genetic manipulation of MTOR activity does in fact not influence high basal levels of autophagy in podocytes either in vitro or in vivo. Instead we present data showing that autophagy in podocytes is mainly controlled by AMP-activated protein kinase (AMPK) and ULK1 (unc-51 like kinase 1). Pharmacological inhibition of MTOR further shows that the uncoupling of MTOR activity and autophagy is time dependent. Together, our data reveal a novel and unexpected cell-specific mechanism, which permits concurrent MTOR activity as well as high basal autophagy rates in podocytes. Thus, these data indicate manipulation of the AMPK-ULK1 axis rather than inhibition of MTOR as a promising therapeutic intervention to enhance autophagy and preserve podocyte homeostasis in glomerular diseases.Abbreviations: AICAR: 5-aminoimidazole-4-carboxamide ribonucleotide; AMPK: AMP-activated protein kinase; ATG: autophagy related; BW: body weight; Cq: chloroquine; ER: endoplasmic reticulum; ESRD: end stage renal disease; FACS: fluorescence activated cell sorting; GFP: green fluorescent protein; i.p.: intra peritoneal; MAP1LC3/LC3: microtubule-associated protein 1 light chain 3; MTOR: mechanistic target of rapamycin kinase; NPHS1: nephrosis 1, nephrin; NPHS2: nephrosis 2, podocin; PLA: proximity-ligation assay; PRKAA: 5'-AMP-activated protein kinase catalytic subunit alpha; RPTOR/RAPTOR: regulatory associated protein of MTOR, complex 1; RFP: red fluorescent protein; TSC1: tuberous sclerosis 1; ULK1: unc-51 like kinase 1.</p>
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<funder>This work was supported by the German Research Foundation [CRC1140, CRC1192]; European Foundation for the Study of Diabetes (EFSD); German Research Foundation Heisenberg Program [HU1016/ 5-1]; German Research Foundation Heisenberg Program [HU1016/8-2]; EC | European Research Council (ERC); H2020-IMI2 BEAt-DKD [115974]; BMBF-STOP-FSGS [01GM1518C]; Excellence Initiative of the German Federal and State Governments BIOSS, FRIAS Freiburg Institute of Advanced Studies; Alexander von Humboldt Foundation; German Research Foundation [CRC992]; National Natural Science Foundation of China (NSFC) [81470912]; Berta Ottenstein Program; Else Kroener Fresenius Foundation NAKSYS;BMBF GlioPATH [01ZX1402B]; BMBF MAPTor-NET [031A426B]; German Research Foundation [TH 1358/3-1]; MESI-STRAT [754688]; Uehara Memorial Foundation; German TS Foundation, Stichting TSC Fonds (calls 2015 and 2017); PoLiMeR Innovative Training Network (Marie SklodowskaCurie grant agreement No. 812616; Rosalind-Franklin Fellowship of the Universitiy of Groningen.</funder>
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<idno type="stamp" n="UNIV-PARIS5">Université Paris Descartes (Paris 5)</idno>
<idno type="stamp" n="CHU-UNIV-PARIS5">Les centres hospitaliers de Paris Descartes</idno>
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<title xml:lang="en">Podocytes maintain high basal levels of autophagy independent of mtor signaling</title>
<author role="aut">
<persName>
<forename type="first">Tillmann</forename>
<surname>Bork</surname>
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<author role="aut">
<persName>
<forename type="first">Wei</forename>
<surname>Liang</surname>
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<affiliation ref="#struct-580222"></affiliation>
<affiliation ref="#struct-580224"></affiliation>
</author>
<author role="aut">
<persName>
<forename type="first">Kosuke</forename>
<surname>Yamahara</surname>
</persName>
<idno type="halauthorid">11723365</idno>
<affiliation ref="#struct-580222"></affiliation>
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</author>
<author role="aut">
<persName>
<forename type="first">Philipp</forename>
<surname>Lee</surname>
</persName>
<idno type="halauthorid">11723366</idno>
<affiliation ref="#struct-580222"></affiliation>
</author>
<author role="aut">
<persName>
<forename type="first">Zhejia</forename>
<surname>Tian</surname>
</persName>
<idno type="halauthorid">11723367</idno>
<affiliation ref="#struct-580222"></affiliation>
</author>
<author role="aut">
<persName>
<forename type="first">Shuya</forename>
<surname>Liu</surname>
</persName>
<idno type="halauthorid">11723368</idno>
<affiliation ref="#struct-580226"></affiliation>
</author>
<author role="aut">
<persName>
<forename type="first">Christoph</forename>
<surname>Schell</surname>
</persName>
<idno type="halauthorid">11723369</idno>
<affiliation ref="#struct-580222"></affiliation>
<affiliation ref="#struct-68615"></affiliation>
</author>
<author role="aut">
<persName>
<forename type="first">Kathrin</forename>
<surname>Thedieck</surname>
</persName>
<idno type="halauthorid">11723370</idno>
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<affiliation ref="#struct-162742"></affiliation>
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</author>
<author role="aut">
<persName>
<forename type="first">Bjoern</forename>
<surname>Hartleben</surname>
</persName>
<idno type="halauthorid">1559003</idno>
<affiliation ref="#struct-114644"></affiliation>
</author>
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<persName>
<forename type="first">Ketan</forename>
<surname>Patel</surname>
</persName>
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<affiliation ref="#struct-87301"></affiliation>
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<forename type="first">Pierre-Louis</forename>
<surname>Tharaux</surname>
</persName>
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</persName>
<idno type="halauthorid">1558999</idno>
<affiliation ref="#struct-81503"></affiliation>
</author>
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<surname>Huber</surname>
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<idno type="issn">1554-8627</idno>
<idno type="eissn">1554-8635</idno>
<title level="j">Autophagy</title>
<imprint>
<publisher>Taylor & Francis</publisher>
<biblScope unit="volume">23</biblScope>
<biblScope unit="pp">1-17</biblScope>
<date type="datePub">2019-12</date>
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<idno type="doi">10.1080/15548627.2019.1705007</idno>
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</langUsage>
<textClass>
<keywords scheme="author">
<term xml:lang="en">AMPK</term>
<term xml:lang="en">LC3</term>
<term xml:lang="en">MTOR</term>
<term xml:lang="en">Raptor</term>
<term xml:lang="en">Tsc1</term>
<term xml:lang="en">autophagy</term>
<term xml:lang="en">glomerulus</term>
<term xml:lang="en">kidney</term>
<term xml:lang="en">podocyte</term>
<term xml:lang="en">rapamycin</term>
<term xml:lang="en">signaling</term>
</keywords>
<classCode scheme="halDomain" n="sdv.mhep">Life Sciences [q-bio]/Human health and pathology</classCode>
<classCode scheme="halDomain" n="sdv.bc">Life Sciences [q-bio]/Cellular Biology</classCode>
<classCode scheme="halTypology" n="ART">Journal articles</classCode>
</textClass>
<abstract xml:lang="en">
<p>While constant basal levels of macroautophagy/autophagy are a prerequisite to preserve long-lived podocytes at the filtration barrier, MTOR regulates at the same time podocyte size and compensatory hypertrophy. Since MTOR is known to generally suppress autophagy, the apparently independent regulation of these two key pathways of glomerular maintenance remained puzzling. We now report that long-term genetic manipulation of MTOR activity does in fact not influence high basal levels of autophagy in podocytes either in vitro or in vivo. Instead we present data showing that autophagy in podocytes is mainly controlled by AMP-activated protein kinase (AMPK) and ULK1 (unc-51 like kinase 1). Pharmacological inhibition of MTOR further shows that the uncoupling of MTOR activity and autophagy is time dependent. Together, our data reveal a novel and unexpected cell-specific mechanism, which permits concurrent MTOR activity as well as high basal autophagy rates in podocytes. Thus, these data indicate manipulation of the AMPK-ULK1 axis rather than inhibition of MTOR as a promising therapeutic intervention to enhance autophagy and preserve podocyte homeostasis in glomerular diseases.Abbreviations: AICAR: 5-aminoimidazole-4-carboxamide ribonucleotide; AMPK: AMP-activated protein kinase; ATG: autophagy related; BW: body weight; Cq: chloroquine; ER: endoplasmic reticulum; ESRD: end stage renal disease; FACS: fluorescence activated cell sorting; GFP: green fluorescent protein; i.p.: intra peritoneal; MAP1LC3/LC3: microtubule-associated protein 1 light chain 3; MTOR: mechanistic target of rapamycin kinase; NPHS1: nephrosis 1, nephrin; NPHS2: nephrosis 2, podocin; PLA: proximity-ligation assay; PRKAA: 5'-AMP-activated protein kinase catalytic subunit alpha; RPTOR/RAPTOR: regulatory associated protein of MTOR, complex 1; RFP: red fluorescent protein; TSC1: tuberous sclerosis 1; ULK1: unc-51 like kinase 1.</p>
</abstract>
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