Identification of nephronectin as a new target for IGF1 action
| Autor: | Lena Lapkina-Gendler, Haim Werner, Rive Sarfstein, Zvi Laron, Karthik Nagaraj |
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| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
endocrine system Cancer Research Kidney development Biology Extracellular matrix 03 medical and health sciences Prostate cancer 0302 clinical medicine Cell Line Tumor Neoplasms medicine Laron syndrome Humans Gene silencing Insulin-Like Growth Factor I Protein kinase B Cell Proliferation Extracellular Matrix Proteins Lymphoblast medicine.disease Laron Syndrome 030104 developmental biology Oncology 030220 oncology & carcinogenesis Cancer research Signal transduction Signal Transduction |
| Zdroj: | European Journal of Cancer. 141:115-127 |
| ISSN: | 0959-8049 |
| Popis: | Introduction The growth hormone (GH)-insulin-like growth factor-1 (IGF1) endocrine axis has a key role in normal growth and development. Laron syndrome (LS) is a type of dwarfism that results from mutation of the GH receptor, leading to congenital IGF1 deficiency. Epidemiological studies have shown that LS patients are protected from cancer. Genome-wide profiling led to the identification of a series of metabolic genes whose differential expression in LS might be linked to cancer protection. Nephronectin (NPNT) is an intracellular and secreted extracellular matrix protein with important roles in kidney development. NPNT was identified as the top-downregulated gene in LS-derived cells in comparison with ethnic-, age- and gender-matched controls (p-value = 0.0148; fold-change = −3.12 versus controls). NPNT has not been previously linked to the IGF1 signaling pathway. The present study was aimed at evaluating the hypothesis that NPNT is a new target for IGF1 action and that decreased expression of NPNT in LS is correlated with cancer protection. Methods Basal and IGF1-stimulated NPNT expression were assessed in LS lymphoblastoid cells as well as in human breast and prostate cancer cells. NPNT silencing experiments were conducted using siRNA methodology. Results We provide evidence that IGF1 stimulates NPNT expression in LS-derived lymphoblastoids and various cancer cell lines. In addition, we demonstrate that NPNT silencing results in diminished activation of the AKT and ERK1/2 pathways, with ensuing decreases in cellular proliferation. Conclusions Our data identified the NPNT gene as a target for IGF1 action. The clinical implications of the functional and physical interactions between NPNT and the IGF1 pathway merit further investigation. |
| Databáze: | OpenAIRE |
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