Abstract 1615
Background
AKT/PKB is a protein kinase that plays a key role in pancreatic adenocarcinoma. Three isoforms with a similar structure but non-overlapping functions have been described: AKT1/PKBα, AKT2/PKBβ and AKT3/PKBγ. Our project studies the molecular routes of adaption to single AKT isoform silencing.
Methods
We have individually silenced AKT isoforms using short hairpin RNAs (shRNAs) delivered by lentivirus. A shRNA against an irrelevant gene was used as control. When cells adapted to the modification, high-throughput quantitative proteomics analyses were performed to evaluate the differentially altered molecular routes. Mitochondrial protein expression was determined by Western Blot. Mitochondrial function was evaluated using Agilent SeaHorse XF. Cancer stem-cell like phenotype was determined by CD44 and EpCAM expression. A subsequent silencing of the escape routes discovered was performed.
Results
Only cells adapted to AKT1 silencing, but not AKT2 or AKT3, exhibited a cancer stem-cell like phenotype with a sharp increase in CD44/EpCAM expression compared to the other cell lines or control (p < 0.0001). shAKT1 expressing cells presented a potentiation of mitochondrial functions determined both by quantitative proteomics, and by basal and maximal oxygen consumption rate (p < 0.0001). Double silencing of AKT1 and the mitochondrial protein TFB2M caused a prolonged cell growth arrest.
Conclusions
When exposed to stable AKT1 inhibition, pancreatic adenocarcinoma cells adapt by switching their metabolism from glycolysis to mitochondrial respiratorion, which suggests a reversion of Warburg effect, and adopting cancer stem-cell like phenotype. Cancer stem cells have been proposed as one of the main factors favouring therapy resistance. Targeting mitochondrial metabolism might improve the efficacy of conventional treatments.
Clinical trial identification
Editorial acknowledgement
Legal entity responsible for the study
Grupo de Inmunomodulación.
Funding
Grupo de Inmunomodulación.
Disclosure
All authors have declared no conflicts of interest.
Resources from the same session
3305 - A phase I dose-escalation and expansion trial of intratumorally administered CV8102, alone and in combination with anti-PD-1 in patients with advanced solid tumors
Presenter: Jürgen Krauss
Session: Poster Display session 1
Resources:
Abstract
5353 - Phase 1/2 Study of 9-ING-41, a small molecule selective Glycogen Synthase Kinase-3 Beta (GSK-3β) Inhibitor, as a Single Agent and Combined with Chemotherapy, in Patients with Refractory Hematological Malignancies or Solid Tumors
Presenter: Benedito Carneiro
Session: Poster Display session 1
Resources:
Abstract
3946 - Trial in progress: a Phase I, open-label study of GSK1795091 administered in combination with immunotherapies in participants with advanced solid tumors (NCT03447314).
Presenter: Aaron Hansen
Session: Poster Display session 1
Resources:
Abstract
3449 - Radiographic Phenotyping to Identify Intracranial Disseminated Recurrence in Brain metastases Treated With Radiosurgery Using Contrast-enhanced MR Imaging
Presenter: CheYu Hsu
Session: Poster Display session 1
Resources:
Abstract
4553 - Association between TP53 mutations and efficacy of Osimertinib for brain metastasis from EGFR-mutant lung cancer
Presenter: Lijuan Chen
Session: Poster Display session 1
Resources:
Abstract
4942 - Response assessment of melanoma brain metastases treated by stereotactic radiotherapy or immunotherapy or both: a comparison of RECIST 1.1, RANO and iRANO criteria
Presenter: Emilie Le Rhun
Session: Poster Display session 1
Resources:
Abstract
3529 - Management of multiple brain metastases by Staged SRS focusing on utmost risk lesions
Presenter: shaoqun Li
Session: Poster Display session 1
Resources:
Abstract
5315 - Whole brain radiotherapy plus simultaneous in-field boost versus whole brain radiotherapy plus fractionated stereotactic radiotherapy for multiple brain metastases of non-small cell lung cancer
Presenter: Lu Li
Session: Poster Display session 1
Resources:
Abstract
1116 - 3D based texture analysis serving as potential diagnostic factor in discriminating primary central nervous system lymphoma from metastatic brain tumors: A preliminary study
Presenter: Wen Guo
Session: Poster Display session 1
Resources:
Abstract
5344 - Global trends in population-based survival for 303,169 adults diagnosed with glioblastoma in 44 countries during 2000-2014 (CONCORD-3)
Presenter: Fabio Girardi
Session: Poster Display session 1
Resources:
Abstract