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Khan MI, Al Johani A, Hamid A, Ateeq B, Manzar N, Adhami VM, Lall RK, Rath S, Sechi M, Siddiqui IA, Choudhry H, Zamzami MA, Havighurst TC, Huang W, Ntambi JM, Mukhtar H. Proproliferative function of adaptor protein GRB10 in prostate carcinoma. FASEB J 2019; 33:3198-3211. [PMID: 30379590 PMCID: PMC6404554 DOI: 10.1096/fj.201800265rr] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Growth factor receptor-binding protein 10 (GRB10) is a well-known adaptor protein and a recently identified substrate of the mammalian target of rapamycin (mTOR). Depletion of GRB10 increases insulin sensitivity and overexpression suppresses PI3K/Akt signaling. Because the major reason for the limited efficacy of PI3K/Akt-targeted therapies in prostate cancer (PCa) is loss of mTOR-regulated feedback suppression, it is therefore important to assess the functional importance and regulation of GRB10 under these conditions. On the basis of these background observations, we explored the status and functional impact of GRB10 in PCa and found maximum expression in phosphatase and tensin homolog (PTEN)-deficient PCa. In human PCa samples, GRB10 inversely correlated with PTEN and positively correlated with pAKT levels. Knockdown of GRB10 in nontumorigenic PTEN null mouse embryonic fibroblasts and tumorigenic PCa cell lines reduced Akt phosphorylation and selectively activated a panel of receptor tyrosine kinases. Similarly, overexpression of GRB10 in PTEN wild-type PCa cell lines accelerated tumorigenesis and induced Akt phosphorylation. In PTEN wild-type PCa, GRB10 overexpression promoted mediated PTEN interaction and degradation. PI3K (but not mTOR) inhibitors reduced GRB10 expression, suggesting primarily PI3K-driven regulation of GRB10. In summary, our results suggest that GRB10 acts as a major downstream effector of PI3K and has tumor-promoting effects in prostate cancer.-Khan, M. I., Al Johani, A., Hamid, A., Ateeq, B., Manzar, N., Adhami, V. M., Lall, R. K., Rath, S., Sechi, M., Siddiqui, I. A., Choudhry, H., Zamzami, M. A., Havighurst, T. C., Huang, W., Ntambi, J. M., Mukhtar, H. Proproliferatve function of adaptor protein GRB10 in prostate carcinoma.
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Affiliation(s)
- Mohammad Imran Khan
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia;,Cancer Metabolism and Epigenetic Unit, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia;,Department of Dermatology, School of Medicine and Public Health, University of Wisconsin, Madison, Wisconsin, USA;,Correspondence: Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia. E-mail:
| | - Ahmed Al Johani
- Department of Biochemistry, School of Medicine and Public Health, University of Wisconsin, Madison, Wisconsin, USA
| | - Abid Hamid
- Department of Dermatology, School of Medicine and Public Health, University of Wisconsin, Madison, Wisconsin, USA
| | - Bushra Ateeq
- Department of Biological Sciences and Bioengineering, Molecular Oncology Laboratory, Indian Institute of Technology–Kanpur (IIT–K), Kanpur, India
| | - Nishat Manzar
- Department of Biological Sciences and Bioengineering, Molecular Oncology Laboratory, Indian Institute of Technology–Kanpur (IIT–K), Kanpur, India
| | - Vaqar Mustafa Adhami
- Department of Dermatology, School of Medicine and Public Health, University of Wisconsin, Madison, Wisconsin, USA
| | - Rahul K. Lall
- Department of Dermatology, School of Medicine and Public Health, University of Wisconsin, Madison, Wisconsin, USA
| | - Suvasmita Rath
- Department of Dermatology, School of Medicine and Public Health, University of Wisconsin, Madison, Wisconsin, USA
| | - Mario Sechi
- Department of Chemistry and Pharmacy, University of Sassari, Sassari, Italy
| | - Imtiaz Ahmad Siddiqui
- Department of Dermatology, School of Medicine and Public Health, University of Wisconsin, Madison, Wisconsin, USA
| | - Hani Choudhry
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia;,Cancer Metabolism and Epigenetic Unit, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Mazin A. Zamzami
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia;,Cancer Metabolism and Epigenetic Unit, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Thomas C. Havighurst
- Department of Biostatistics and Medical Informatics, School of Medicine and Public Health, University of Wisconsin, Madison, Wisconsin, USA
| | - Wei Huang
- Department of Pathology and Laboratory Medicine, School of Medicine and Public Health, University of Wisconsin, Madison, Wisconsin, USA
| | - James M. Ntambi
- Department of Biochemistry, School of Medicine and Public Health, University of Wisconsin, Madison, Wisconsin, USA
| | - Hasan Mukhtar
- Department of Dermatology, School of Medicine and Public Health, University of Wisconsin, Madison, Wisconsin, USA
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