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Corbet AK, Bikorimana E, Boyd RI, Shokry D, Kries K, Gupta A, Paton A, Sun Z, Fazal Z, Freemantle SJ, Nelson ER, Spinella MJ, Singh R. G0S2 promotes antiestrogenic and pro-migratory responses in ER+ and ER- breast cancer cells. Transl Oncol 2023; 33:101676. [PMID: 37086619 DOI: 10.1016/j.tranon.2023.101676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 04/12/2023] [Accepted: 04/14/2023] [Indexed: 04/24/2023] Open
Abstract
G0/G1 switch gene 2 (G0S2) is known to inhibit lipolysis by inhibiting adipose triglyceride lipase (ATGL). In this report, we dissect the role of G0S2 in ER+ versus ER- breast cancer. Overexpression of G0S2 in ER- cells increased cell proliferation, while G0S2 overexpression in ER+ cells decreased cell proliferation. Transcriptome analysis revealed that G0S2 mediated distinct but overlapping transcriptional responses in ER- and ER+ cells. G0S2 reduced genes associated with an epithelial phenotype, especially in ER- cells, including CDH1, ELF3, STEAP4 and TACSTD2, suggesting promotion of the epithelial-mesenchymal transition (EMT). G0S2 also repressed estrogen signaling and estrogen receptor target gene signatures, especially in ER+ cells, including TFF1 and TFF3. In addition, G0S2 overexpression increased cell migration in ER- cells and increased estrogen deprivation sensitivity in ER+ cells. Interestingly, two genes downstream of ATGL in fat utilization and very important in steroid hormone biosynthesis, HMGCS1 and HMGCS2, were downregulated in G0S2 overexpressing ER+ cells. In addition, HSD17B11, a gene that converts estradiol to its less estrogenic derivative, estrone, was highly upregulated in G0S2 overexpressing ER+ cells, suggesting G0S2 overexpression has a negative effect on estradiol production and maintenance. High expression of G0S2 and HSD17B11 was associated with improved relapse-free survival in breast cancer patients while high expression of HMGSC1 was associated with poor survival. Finally, we deleted G0S2 in breast cancer-prone MMTV-PyMT mice. Our data indicates a complex role for G0S2 in breast cancer, dependent on ER status, that may be partially mediated by suppression of the estrogen signaling pathway.
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Affiliation(s)
- Andrea K Corbet
- Department of Comparative Biosciences, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA
| | - Emmanuel Bikorimana
- Department of Comparative Biosciences, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA
| | - Raya I Boyd
- Department of Comparative Biosciences, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA
| | - Doha Shokry
- Department of Comparative Biosciences, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA
| | - Kelly Kries
- Department of Comparative Biosciences, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA
| | - Ayush Gupta
- Department of Comparative Biosciences, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA
| | - Anneliese Paton
- Department of Comparative Biosciences, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA
| | - Zhengyang Sun
- Department of Comparative Biosciences, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA
| | - Zeeshan Fazal
- Department of Comparative Biosciences, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA
| | - Sarah J Freemantle
- Department of Comparative Biosciences, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA
| | - Erik R Nelson
- Department of Molecular and Integrative Physiology, University of Illinois Urbana-Champaign, Urbana, IL 61801, USA; Carle Illinois College of Medicine University of Illinois Urbana-Champaign, Urbana IL 61801, USA; Carl R. Woese Institute for Genomic Biology, Anticancer Discovery from Pets to People Theme, University of Illinois Urbana-Champaign, Urbana IL 61801, USA; Cancer Center of Illinois, University of Illinois Urbana-Champaign, Urbana IL 61801, USA
| | - Michael J Spinella
- Department of Comparative Biosciences, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA; Carle Illinois College of Medicine University of Illinois Urbana-Champaign, Urbana IL 61801, USA; Carl R. Woese Institute for Genomic Biology, Anticancer Discovery from Pets to People Theme, University of Illinois Urbana-Champaign, Urbana IL 61801, USA; Cancer Center of Illinois, University of Illinois Urbana-Champaign, Urbana IL 61801, USA.
| | - Ratnakar Singh
- Department of Comparative Biosciences, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA.
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Riegler-Berket L, Wechselberger L, Cerk IK, Padmanabha Das KM, Viertlmayr R, Kulminskaya N, Rodriguez Gamez CF, Schweiger M, Zechner R, Zimmermann R, Oberer M. Residues of the minimal sequence of G0S2 collectively contribute to ATGL inhibition while C-and N-terminal extensions promote binding to ATGL. Biochim Biophys Acta Mol Cell Biol Lipids 2022; 1867:159105. [PMID: 35026402 DOI: 10.1016/j.bbalip.2021.159105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 11/29/2021] [Accepted: 12/17/2021] [Indexed: 11/25/2022]
Abstract
The protein encoded by the G0/G1 switch gene 2 (G0S2) is a potent inhibitor of adipose triglyceride lipase (ATGL) and thus an important regulator of intracellular lipolysis. Since dysfunction of lipolysis is associated with metabolic diseases including diabetes and obesity, inhibition of ATGL is considered a therapeutic strategy. G0S2 interacts with ATGL's patatin-domain to mediate non-competitive inhibition, however atomic details of the inhibition mechanism are incompletely understood. Sequences of G0S2 from higher organisms show a highly conserved N-terminal part, including a hydrophobic region covering amino acids 27 to 42. We show that predicted G0S2 orthologs from platypus, chicken and Japanese rice-fish are able to inhibit human and mouse ATGL, emphasizing the contribution of conserved amino acid to ATGL inhibition. Our site directed mutagenesis and truncation studies give insights in the protein-protein interaction on a per-residue level. We determine that the minimal sequence required for ATGL inhibition ranges from amino acids 20 to 44. Residues Y27, V28, G30, A34 G37, V39 or L42 within this sequence play a substantial role in ATGL inhibition. Furthermore, we show that unspecific interactions of the N-terminal part (amino acids 20-27) of the minimal sequence facilitate the interaction to ATGL. Our studies also demonstrate that full-length G0S2 shows higher tolerance to specific single amino acid exchanges in the hydrophobic region due to the stronger contributions of unspecific interactions. However, exchanges of more than one amino-acid in the hydrophobic region also result in the loss of function as ATGL inhibitor even in the full-length protein.
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Affiliation(s)
- L Riegler-Berket
- Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria
| | - L Wechselberger
- Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria
| | - I K Cerk
- Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria
| | - K M Padmanabha Das
- Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria; Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA
| | - R Viertlmayr
- Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria
| | - N Kulminskaya
- Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria
| | | | - M Schweiger
- Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria; BioTechMed Graz, 8010 Graz, Austria
| | - R Zechner
- Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria; BioTechMed Graz, 8010 Graz, Austria; BioHealth Field of Excellence, University of Graz, 8010 Graz, Austria
| | - R Zimmermann
- Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria; BioTechMed Graz, 8010 Graz, Austria; BioHealth Field of Excellence, University of Graz, 8010 Graz, Austria
| | - M Oberer
- Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria; BioTechMed Graz, 8010 Graz, Austria; BioHealth Field of Excellence, University of Graz, 8010 Graz, Austria.
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