AMPK/FOXO3a Pathway Increases Activity and/or Expression of ATM, DNA-PKcs, Src, EGFR, PDK1, and SOD2 and Induces Radioresistance under Nutrient Starvation.
AMPK
ATM
DNA-PKcs
EGFR
FOXO3a
PDK1
SOD2
apoptosis
nutrient starvation
radiation sensitivity
Journal
International journal of molecular sciences
ISSN: 1422-0067
Titre abrégé: Int J Mol Sci
Pays: Switzerland
ID NLM: 101092791
Informations de publication
Date de publication:
15 Aug 2023
15 Aug 2023
Historique:
received:
11
07
2023
revised:
13
08
2023
accepted:
14
08
2023
medline:
28
8
2023
pubmed:
26
8
2023
entrez:
26
8
2023
Statut:
epublish
Résumé
Most solid tumors contain hypoxic and nutrient-deprived microenvironments. The cancer cells in these microenvironments have been reported to exhibit radioresistance. We have previously reported that nutrient starvation increases the expression and/or activity of ATM and DNA-PKcs, which are involved in the repair of DNA double-strand breaks induced by ionizing radiation. In the present study, to elucidate the molecular mechanisms underlying these phenomena, we investigated the roles of AMPK and FOXO3a, which play key roles in the cellular response to nutrient starvation. Nutrient starvation increased clonogenic cell survival after irradiation and increased the activity and/or expression of AMPKα, FOXO3a, ATM, DNA-PKcs, Src, EGFR, PDK1, and SOD2 in MDA-MB-231 cells. Knockdown of AMPKα using siRNA suppressed the activity and/or expression of FOXO3a, ATM, DNA-PKcs, Src, EGFR, PDK1, and SOD2 under nutrient starvation. Knockdown of FOXO3a using siRNA suppressed the activity and/or expression of AMPKα, ATM, DNA-PKcs, FOXO3a, Src, EGFR, PDK1, and SOD2 under nutrient starvation. Nutrient starvation decreased the incidence of apoptosis after 8 Gy irradiation. Knockdown of FOXO3a increased the incidence of apoptosis after irradiation under nutrient starvation. AMPK and FOXO3a appear to be key molecules that induce radioresistance under nutrient starvation and may serve as targets for radiosensitization.
Identifiants
pubmed: 37629008
pii: ijms241612828
doi: 10.3390/ijms241612828
pmc: PMC10454868
pii:
doi:
Substances chimiques
AMP-Activated Protein Kinases
EC 2.7.11.31
RNA, Small Interfering
0
ErbB Receptors
EC 2.7.10.1
DNA
9007-49-2
EGFR protein, human
EC 2.7.10.1
ATM protein, human
EC 2.7.11.1
Ataxia Telangiectasia Mutated Proteins
EC 2.7.11.1
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Subventions
Organisme : The Ministry of Education, Culture, Sports, Science and Technology of Japan
ID : 20H03616
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