Cited by 152Drug Transport and Resistance MechanismsPI3K/AKT/mTOR signaling in cancerAntibiotic Resistance in Bacteria

The PI3K subunits, P110α and P110β are potential targets for overcoming P-gp and BCRP-mediated MDR in cancer

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Zhang, Lei, Li, Yidong, Wang, Qianchao, Chen, Zhuo, Li, Xiaoyun, Wu, Zhuoxun, Hu, Chaohua, Liao, Dan +2 more·2020·Molecular Cancer

Abstract

Background: PI3K/AKT is a vital signaling pathway in humans. Recently, several PI3K/AKT inhibitors were reported to have the ability to reverse cancer multidrug resistance (MDR); however, specific targets in the PI3K/AKT pathways and the mechanisms associated with MDR have not been found because many of the inhibitors have multiple targets within a large candidate protein pool. AKT activation is one presumed mechanism by which MDR develops during cancer treatment. Methods: The effects of inhibiting PI3K 110α and 110β by BAY-1082439 treatment and CRISPR/Cas9 knockout were examined to determine the possible functions of BAY-1082439 and the roles of PI3K 110α and 110β in the reversal of MDR that is mediated by the downregulation of P-gp and BCRP. Inhibition of AKT with GSK-2110183 showed that the downregulation of P-gp and BCRP is independent of generalized AKT inactivation. Immunofluorescence, immunoprecipitation, MTT, flow cytometry and JC-1 staining analyses were conducted to study the reversal of MDR that is mediated by P-gp and BCRP in cancer cells. An ATPase assay and a structural analysis were also used to analyze the potential mechanisms by which BAY-1082439 specifically targets PI3K 110α and 110β and nonspecifically influences P-gp and BCRP. Results: By inhibiting the activation of the PI3K 110α and 110β catalytic subunits through both the administration of BAY-1082439 and the CRISPR/Cas9 deletion of Pik3ca and Pik3cb , the ATP-binding cassette transporters P-gp/ABCB1 and BCRP/ABCG2 were downregulated, thereby reestablishing the drug sensitivity of human epidermoid carcinoma and non-small cell lung cancer (NSCLC) MDR cells. Inhibition of AKT did not reverse the MDR mediated by P-gp or BCRP. The ABC family proteins and AKT may play MDR-enhancing roles independently. Conclusions: The reversal of the dual functions of ABC-transporter-mediated and AKT-activation-enhanced MDR through the inhibition or knockout of PI3K 110α or 110β promises to improve current strategies based on combined drug treatments to overcome MDR challenges.

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Authors
Zhang, L., Li, Y., Wang, Q., Chen, Z., Li, X., Wu, Z., Hu, C., Liao, D., Zhang, W., & Chen, Z.-S.
Affiliations
  • St. John's University (US)
  • Chinese Academy of Sciences (CN)
  • Fujian Agriculture and Forestry University (CN)
  • Weifang Medical University (CN)
Corresponding author
  • Chen, Zhuo
  • Chen, Zhe-Sheng
Venue
Molecular Cancer
Published
2020-01-17
Volume
19
Issue
1
Pages
10-10
ISSN
1476-4598 (ISSN-L)
OpenAlex
W3004667471
Cited by
152
References
59
Citations by year
2026: 12 · 2025: 20 · 2024: 23 · 2023: 16 · 2022: 45 · 2021: 21 · 2020: 13 · 2019: 1
FWCI
8.58
Type
journal article
Language
en
Open access
Locations
  • Molecular Cancer (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Institute of Health - USA (1R15GM116043−01)
  • China Scholarship Council
  • St. John’s University Research Seed Grant (579−1110−7002)
  • National Nature Science Foundation of China (21877113, 31300650, 31771723)
  • Fujian Provincial Department of Science and Technology (2013N0039, 2017J01456)
Topics
  • Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Medicine › Antibiotic Resistance in Bacteria
Keywords
PI3K p110α, PI3K p110β, multidrug resistance, P-glycoprotein, ABCG2, ABC transporters, AKT inhibition, drug resistance reversal
MeSH terms
ATP Binding Cassette Transporter, Subfamily G, Member 2, Carcinoma, Squamous Cell, Humans, Neoplasm Proteins, Tumor Cells, Cultured, Biomarkers, Tumor, Gene Expression Regulation, Neoplastic, Apoptosis, Drug Resistance, Multiple, ATP Binding Cassette Transporter, Subfamily B, Drug Resistance, Neoplasm, Protein Kinase Inhibitors, Cell Proliferation, Class I Phosphatidylinositol 3-Kinases

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