PAQR3 suppresses the growth of non-small cell lung cancer cells via modulation of EGFR-mediated autophagy

Macroautophagy/autophagy is an evolutionarily conserved intracellular process that recycles and degrades intracellular components to sustain homeostasis in response to deficiency of nutrients or growth factors. PAQR3 is a newly discovered tumor suppressor that also regulates autophagy induced by nut...

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Veröffentlicht in:Autophagy 2020-07, Vol.16 (7), p.1236-1247
Hauptverfasser: Cao, Qianqian, You, Xue, Xu, Lijiao, Wang, Lin, Chen, Yan
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container_title Autophagy
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creator Cao, Qianqian
You, Xue
Xu, Lijiao
Wang, Lin
Chen, Yan
description Macroautophagy/autophagy is an evolutionarily conserved intracellular process that recycles and degrades intracellular components to sustain homeostasis in response to deficiency of nutrients or growth factors. PAQR3 is a newly discovered tumor suppressor that also regulates autophagy induced by nutrient starvation via AMPK and MTORC1 signaling pathways. In this study, we investigated whether PAQR3 modulates EGFR-mediated autophagy and whether such regulation is associated with the tumor suppressive activity of PAQR3. PAQR3 is able to inhibit the in vitro and in vivo growth of non-small cell lung cancer (NSCLC) cells. PAQR3 potentiates autophagy induced by EGFR inhibitor erlotinib. Knockdown of PAQR3 abrogates erlotinib-mediated reduction of BECN1 interaction with autophagy inhibitory proteins RUBCN/Rubicon and BCL2. PAQR3 blocks the interaction of BECN1 with the activated form of EGFR and inhibits tyrosine phosphorylation of BECN1. Furthermore, inhibition of autophagy by knocking down ATG7 abrogates the tumor suppressive activity of PAQR3 in NSCLC cells. Collectively, these data indicate that PAQR3 suppresses tumor progression of NSCLC cells through modulating EGFR-regulated autophagy. AKT: thymoma viral proto-oncogene; ATG5: autophagy related 5; ATG7: autophagy related 7; ATG14: autophagy related 14; BCL2: B cell leukemia/lymphoma 2; BECN1: beclin 1; CCK-8: cell counting kit-8; CQ: chloroquine diphosphate; DMEM: Dulbecco's modified Eagle's medium; EdU: 5-ethynyl-2ʹ-deoxyuridine; EGFR: epidermal growth factor receptor; FBS: fetal bovine serum; GAPDH: glyceraldehyde-3-phosphate dehydrogenase; IgG: Immunoglobulin G; MAP1LC3B/LC3B: microtubule-associated protein 1 light chain 3 beta; MTOR: mechanistic target of rapamycin kinase; MTORC1: mechanistic target of rapamycin kinase complex 1; MTT: thiazolyl blue tetrazolium bromide; NSCLC: Non-small cell lung cancer; MAP2K/MEK: mitogen-activated protein kinase kinase; MAPK/ERK: mitogen-activated protein kinase; PAQR3: progestin and adipoQ receptor family member 3; PI3K: phosphatidylinositol-4,5-bisphosphate 3-kinase; PIK3C3/VPS34: phosphatidylinositol 3-kinase catalytic subunit type 3; PIK3R4/VPS15: phosphoinositide-3-kinase regulatory subunit 4; PRKAA/AMPK: protein kinase, AMP-activated alpha catalytic; RUBCN: rubicon autophagy regulator; RPS6: ribosomal protein S6; RAS: Ras proto-oncogene; RAF: Raf proto-oncogene; TKI: tyrosine kinase inhibitor; TUBA4A: tubulin alpha 4a; UVRAG: UV radiation resistance associated.
doi_str_mv 10.1080/15548627.2019.1659654
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PAQR3 is a newly discovered tumor suppressor that also regulates autophagy induced by nutrient starvation via AMPK and MTORC1 signaling pathways. In this study, we investigated whether PAQR3 modulates EGFR-mediated autophagy and whether such regulation is associated with the tumor suppressive activity of PAQR3. PAQR3 is able to inhibit the in vitro and in vivo growth of non-small cell lung cancer (NSCLC) cells. PAQR3 potentiates autophagy induced by EGFR inhibitor erlotinib. Knockdown of PAQR3 abrogates erlotinib-mediated reduction of BECN1 interaction with autophagy inhibitory proteins RUBCN/Rubicon and BCL2. PAQR3 blocks the interaction of BECN1 with the activated form of EGFR and inhibits tyrosine phosphorylation of BECN1. Furthermore, inhibition of autophagy by knocking down ATG7 abrogates the tumor suppressive activity of PAQR3 in NSCLC cells. Collectively, these data indicate that PAQR3 suppresses tumor progression of NSCLC cells through modulating EGFR-regulated autophagy. 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PAQR3 is a newly discovered tumor suppressor that also regulates autophagy induced by nutrient starvation via AMPK and MTORC1 signaling pathways. In this study, we investigated whether PAQR3 modulates EGFR-mediated autophagy and whether such regulation is associated with the tumor suppressive activity of PAQR3. PAQR3 is able to inhibit the in vitro and in vivo growth of non-small cell lung cancer (NSCLC) cells. PAQR3 potentiates autophagy induced by EGFR inhibitor erlotinib. Knockdown of PAQR3 abrogates erlotinib-mediated reduction of BECN1 interaction with autophagy inhibitory proteins RUBCN/Rubicon and BCL2. PAQR3 blocks the interaction of BECN1 with the activated form of EGFR and inhibits tyrosine phosphorylation of BECN1. Furthermore, inhibition of autophagy by knocking down ATG7 abrogates the tumor suppressive activity of PAQR3 in NSCLC cells. Collectively, these data indicate that PAQR3 suppresses tumor progression of NSCLC cells through modulating EGFR-regulated autophagy. 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PAQR3 is a newly discovered tumor suppressor that also regulates autophagy induced by nutrient starvation via AMPK and MTORC1 signaling pathways. In this study, we investigated whether PAQR3 modulates EGFR-mediated autophagy and whether such regulation is associated with the tumor suppressive activity of PAQR3. PAQR3 is able to inhibit the in vitro and in vivo growth of non-small cell lung cancer (NSCLC) cells. PAQR3 potentiates autophagy induced by EGFR inhibitor erlotinib. Knockdown of PAQR3 abrogates erlotinib-mediated reduction of BECN1 interaction with autophagy inhibitory proteins RUBCN/Rubicon and BCL2. PAQR3 blocks the interaction of BECN1 with the activated form of EGFR and inhibits tyrosine phosphorylation of BECN1. Furthermore, inhibition of autophagy by knocking down ATG7 abrogates the tumor suppressive activity of PAQR3 in NSCLC cells. Collectively, these data indicate that PAQR3 suppresses tumor progression of NSCLC cells through modulating EGFR-regulated autophagy. AKT: thymoma viral proto-oncogene; ATG5: autophagy related 5; ATG7: autophagy related 7; ATG14: autophagy related 14; BCL2: B cell leukemia/lymphoma 2; BECN1: beclin 1; CCK-8: cell counting kit-8; CQ: chloroquine diphosphate; DMEM: Dulbecco's modified Eagle's medium; EdU: 5-ethynyl-2ʹ-deoxyuridine; EGFR: epidermal growth factor receptor; FBS: fetal bovine serum; GAPDH: glyceraldehyde-3-phosphate dehydrogenase; IgG: Immunoglobulin G; MAP1LC3B/LC3B: microtubule-associated protein 1 light chain 3 beta; MTOR: mechanistic target of rapamycin kinase; MTORC1: mechanistic target of rapamycin kinase complex 1; MTT: thiazolyl blue tetrazolium bromide; NSCLC: Non-small cell lung cancer; MAP2K/MEK: mitogen-activated protein kinase kinase; MAPK/ERK: mitogen-activated protein kinase; PAQR3: progestin and adipoQ receptor family member 3; PI3K: phosphatidylinositol-4,5-bisphosphate 3-kinase; PIK3C3/VPS34: phosphatidylinositol 3-kinase catalytic subunit type 3; PIK3R4/VPS15: phosphoinositide-3-kinase regulatory subunit 4; PRKAA/AMPK: protein kinase, AMP-activated alpha catalytic; RUBCN: rubicon autophagy regulator; RPS6: ribosomal protein S6; RAS: Ras proto-oncogene; RAF: Raf proto-oncogene; TKI: tyrosine kinase inhibitor; TUBA4A: tubulin alpha 4a; UVRAG: UV radiation resistance associated.</abstract><cop>United States</cop><pub>Taylor &amp; Francis</pub><pmid>31448672</pmid><doi>10.1080/15548627.2019.1659654</doi><tpages>12</tpages><orcidid>https://orcid.org/0000-0002-6630-0693</orcidid><oa>free_for_read</oa></addata></record>
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source MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; PubMed Central
subjects Animals
ATG7
autophagy
Autophagy - drug effects
Beclin-1 - metabolism
BECN1
Carcinoma, Non-Small-Cell Lung - drug therapy
Carcinoma, Non-Small-Cell Lung - metabolism
Carcinoma, Non-Small-Cell Lung - pathology
Cell Line, Tumor
Cell Proliferation - drug effects
EGFR
ErbB Receptors - metabolism
Erlotinib Hydrochloride - pharmacology
Erlotinib Hydrochloride - therapeutic use
HEK293 Cells
Humans
Intracellular Signaling Peptides and Proteins - metabolism
lung cancer
Lung Neoplasms - drug therapy
Lung Neoplasms - metabolism
Lung Neoplasms - pathology
Membrane Proteins - metabolism
Mice, Nude
Phosphorylation - drug effects
Proto-Oncogene Mas
Research Paper
tumor suppressor
title PAQR3 suppresses the growth of non-small cell lung cancer cells via modulation of EGFR-mediated autophagy
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