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Vallejo-Díaz J, Olazabal-Morán M, Cariaga-Martínez AE, Pajares MJ, Flores JM, Pio R, Montuenga LM, Carrera AC. Targeted depletion of PIK3R2 induces regression of lung squamous cell carcinoma. Oncotarget 2018; 7:85063-85078. [PMID: 27835880 PMCID: PMC5356720 DOI: 10.18632/oncotarget.13195] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Accepted: 10/21/2016] [Indexed: 02/03/2023] Open
Abstract
Oncogenic mutations in the PI3K/AKT pathway are present in nearly half of human tumors. Nonetheless, inhibitory compounds of the pathway often induce pathway rebound and tumor resistance. We find that lung squamous cell carcinoma (SQCC), which accounts for ~20% of lung cancer, exhibits increased expression of the PI3K subunit PIK3R2, which is at low expression levels in normal tissues. We tested a new approach to interfere with PI3K/AKT pathway activation in lung SQCC. We generated tumor xenografts of SQCC cell lines and examined the consequences of targeting PIK3R2 expression. In tumors with high PIK3R2 expression, and independently of PIK3CA, KRAS, or PTEN mutations, PIK3R2 depletion induced lung SQCC xenograft regression without triggering PI3K/AKT pathway rebound. These results validate the use PIK3R2 interfering tools for the treatment of lung squamous cell carcinoma.
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Affiliation(s)
- Jesús Vallejo-Díaz
- Department of Immunology and Oncology, Centro Nacional de Biotecnología (CNB-CSIC), Universidad Autónoma de Madrid, Cantoblanco, Madrid
| | - Manuel Olazabal-Morán
- Department of Immunology and Oncology, Centro Nacional de Biotecnología (CNB-CSIC), Universidad Autónoma de Madrid, Cantoblanco, Madrid
| | - Ariel E Cariaga-Martínez
- Department of Immunology and Oncology, Centro Nacional de Biotecnología (CNB-CSIC), Universidad Autónoma de Madrid, Cantoblanco, Madrid
| | - María J Pajares
- Program in Solid Tumors and Biomarkers, Center for Applied Medical Research (CIMA), Pamplona, Spain.,Navarra Health Research Institute (IDISNA), University of Navarra, Pamplona, Spain.,Department of Histology and Pathology, School of Medicine, University of Navarra, Pamplona, Spain
| | - Juana M Flores
- Department of Animal Medicine and Surgery, School of Veterinary Medicine, Complutense University of Madrid, Spain
| | - Ruben Pio
- Program in Solid Tumors and Biomarkers, Center for Applied Medical Research (CIMA), Pamplona, Spain.,Navarra Health Research Institute (IDISNA), University of Navarra, Pamplona, Spain.,Department of Biochemistry and Genetics, School of Science, University of Navarra, Pamplona, Spain
| | - Luis M Montuenga
- Program in Solid Tumors and Biomarkers, Center for Applied Medical Research (CIMA), Pamplona, Spain.,Navarra Health Research Institute (IDISNA), University of Navarra, Pamplona, Spain.,Department of Histology and Pathology, School of Medicine, University of Navarra, Pamplona, Spain
| | - Ana Clara Carrera
- Department of Immunology and Oncology, Centro Nacional de Biotecnología (CNB-CSIC), Universidad Autónoma de Madrid, Cantoblanco, Madrid
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