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Mauro L, Naimo GD, Gelsomino L, Malivindi R, Bruno L, Pellegrino M, Tarallo R, Memoli D, Weisz A, Panno ML, Andò S. Uncoupling effects of estrogen receptor α on LKB1/AMPK interaction upon adiponectin exposure in breast cancer. FASEB J 2018. [PMID: 29513571 DOI: 10.1096/fj.201701315r] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Adipose tissue is a metabolic and endocrine organ that secretes bioactive molecules called adipocytokines. Among these, adiponectin has a crucial role in obesity-associated breast cancer. The key molecule of adiponectin signaling is AMPK, which is mainly activated by liver kinase B1 (LKB1). Here, we demonstrated that estrogen receptor-α (ERα)/LKB1 interaction may negatively interfere with the LKB1 capability to phosphorylate AMPK and inhibit its downstream signaling TSC2/mTOR/p70S6k. In adiponectin-treated MCF-7 cells, AMPK signaling was not working, resulting in its downstream target acetyl-CoA carboxylase (ACC) being still active. In contrast, in MDA-MB-231 cells, AMPK and ACC phosphorylation was enhanced by adiponectin, inhibiting lipogenesis and cell growth. Upon adiponectin, ERα signaling switched the energy balance of breast cancer cells toward a lipogenic phenotype. Therefore, adiponectin played an inhibitory role on ERα-negative cell growth and progression in vitro and in vivo. In contrast, low adiponectin levels, similar to those circulating in obese patients, acted on ERα-positive cells as a growth factor, stimulating proliferation. The latter effect was blunted in vivo by high adiponectin concentration. All this may have translational relevance, addressing how the handling of adiponectin, as a therapeutic tool in breast cancer treatment, needs to be carefully considered in ERα-positive obese patients, where circulating levels of this adipocytokine are relatively low. In other words, in ERα-positive breast cancer obese patients, higher adiponectin doses should be administered with respect to ERα-negative breast cancer, also opportunely combined with antiestrogen therapy. -Mauro, L., Naimo, G. D., Gelsomino, L., Malivindi, R., Bruno, L., Pellegrino, M., Tarallo, R., Memoli, D., Weisz, A., Panno, M. L., Andò, S. Uncoupling effects of estrogen receptor α on LKB1/AMPK interaction upon adiponectin exposure in breast cancer.
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Affiliation(s)
- Loredana Mauro
- Department of Pharmacy, Health, and Nutritional Sciences, University of Calabria, Rende, Italy
| | | | - Luca Gelsomino
- Department of Pharmacy, Health, and Nutritional Sciences, University of Calabria, Rende, Italy
| | - Rocco Malivindi
- Department of Pharmacy, Health, and Nutritional Sciences, University of Calabria, Rende, Italy
| | - Leonardo Bruno
- Department of Biology, Ecology, and Earth Sciences, University of Calabria, Rende, Italy
| | - Michele Pellegrino
- Department of Pharmacy, Health, and Nutritional Sciences, University of Calabria, Rende, Italy
| | - Roberta Tarallo
- Laboratory of Molecular Medicine and Genomics, Department of Medicine, Surgery, and Dentistry, Scuola Medica Salernitana, Baronissi, Italy
| | - Domenico Memoli
- Laboratory of Molecular Medicine and Genomics, Department of Medicine, Surgery, and Dentistry, Scuola Medica Salernitana, Baronissi, Italy
| | - Alessandro Weisz
- Laboratory of Molecular Medicine and Genomics, Department of Medicine, Surgery, and Dentistry, Scuola Medica Salernitana, Baronissi, Italy
| | - Maria Luisa Panno
- Department of Pharmacy, Health, and Nutritional Sciences, University of Calabria, Rende, Italy
| | - Sebastiano Andò
- Department of Pharmacy, Health, and Nutritional Sciences, University of Calabria, Rende, Italy
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Giurato G, Nassa G, Salvati A, Alexandrova E, Rizzo F, Nyman TA, Weisz A, Tarallo R. Quantitative mapping of RNA-mediated nuclear estrogen receptor β interactome in human breast cancer cells. Sci Data 2018; 5:180031. [PMID: 29509190 PMCID: PMC5839158 DOI: 10.1038/sdata.2018.31] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Accepted: 01/22/2018] [Indexed: 12/13/2022] Open
Abstract
The nuclear receptor estrogen receptor 2 (ESR2, ERβ) modulates cancer cell proliferation and tumor growth, exerting an oncosuppressive role in breast cancer (BC). Interaction proteomics by tandem affinity purification coupled to mass spectrometry was previously applied in BC cells to identify proteins acting in concert with ERβ to control key cellular functions, including gene transcription, RNA splicing and post-transcriptional mRNA regulation. These studies revealed an involvement of RNA in ERβ interactome assembly and functions. By applying native protein complex purification followed by nano LC-MS/MS before and after in vitro RNA removal, we generated a large dataset of newly identified nuclear ERβ interactors, including a subset associating with the receptor via RNA bridging. These datasets will be useful to investigate further the role of ERβ, nuclear RNAs and the other proteins identified here in BC and other cell types.
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Affiliation(s)
- Giorgio Giurato
- Laboratory of Molecular Medicine and Genomics, Department of Medicine, Surgery and Dentistry "Scuola Medica Salernitana", University of Salerno, 84081 Baronissi (SA), Italy.,Genomix4Life srl, Department of Medicine, Surgery and Dentistry "Scuola Medica Salernitana", University of Salerno, 84081, Baronissi (SA), Italy
| | - Giovanni Nassa
- Laboratory of Molecular Medicine and Genomics, Department of Medicine, Surgery and Dentistry "Scuola Medica Salernitana", University of Salerno, 84081 Baronissi (SA), Italy
| | - Annamaria Salvati
- Laboratory of Molecular Medicine and Genomics, Department of Medicine, Surgery and Dentistry "Scuola Medica Salernitana", University of Salerno, 84081 Baronissi (SA), Italy
| | - Elena Alexandrova
- Laboratory of Molecular Medicine and Genomics, Department of Medicine, Surgery and Dentistry "Scuola Medica Salernitana", University of Salerno, 84081 Baronissi (SA), Italy
| | - Francesca Rizzo
- Laboratory of Molecular Medicine and Genomics, Department of Medicine, Surgery and Dentistry "Scuola Medica Salernitana", University of Salerno, 84081 Baronissi (SA), Italy
| | - Tuula A Nyman
- Department of Immunology, Institute of Clinical Medicine, University of Oslo and Rikshospitalet Oslo, 0372 Oslo, Norway
| | - Alessandro Weisz
- Laboratory of Molecular Medicine and Genomics, Department of Medicine, Surgery and Dentistry "Scuola Medica Salernitana", University of Salerno, 84081 Baronissi (SA), Italy
| | - Roberta Tarallo
- Laboratory of Molecular Medicine and Genomics, Department of Medicine, Surgery and Dentistry "Scuola Medica Salernitana", University of Salerno, 84081 Baronissi (SA), Italy
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Splicing of platelet resident pre-mRNAs upon activation by physiological stimuli results in functionally relevant proteome modifications. Sci Rep 2018; 8:498. [PMID: 29323256 PMCID: PMC5765118 DOI: 10.1038/s41598-017-18985-5] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Accepted: 12/19/2017] [Indexed: 12/12/2022] Open
Abstract
Platelet activation triggers thrombus formation in physiological and pathological conditions, such as acute coronary syndromes. Current therapies still fail to prevent thrombotic events in numerous patients, indicating that the mechanisms modulating platelet response during activation need to be clarified. The evidence that platelets are capable of de novo protein synthesis in response to stimuli raised the issue of how megakaryocyte-derived mRNAs are regulated in these anucleate cell fragments. Proteogenomics was applied here to investigate this phenomeon in platelets activated in vitro with Collagen or Thrombin Receptor Activating Peptide. Combining proteomics and transcriptomics allowed in depth platelet proteome characterization, revealing a significant effect of either stimulus on proteome composition. In silico analysis revealed the presence of resident immature RNAs in resting platelets, characterized by retained introns, while unbiased proteogenomics correlated intron removal by RNA splicing with changes on proteome composition upon activation. This allowed identification of a set of transcripts undergoing maturation by intron removal during activation and resulting in accumulation of the corresponding peptides at exon-exon junctions. These results indicate that RNA splicing events occur in platelets during activation and that maturation of specific pre-mRNAs is part of the activation cascade, contributing to a dynamic fine-tuning of the transcriptome.
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