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Nicolò S, Antonelli A, Tanturli M, Baccani I, Bonaiuto C, Castronovo G, Rossolini GM, Mattiuz G, Torcia MG. Bacterial Species from Vaginal Microbiota Differently Affect the Production of the E6 and E7 Oncoproteins and of p53 and p-Rb Oncosuppressors in HPV16-Infected Cells. Int J Mol Sci 2023; 24:ijms24087173. [PMID: 37108333 PMCID: PMC10138431 DOI: 10.3390/ijms24087173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 04/07/2023] [Accepted: 04/10/2023] [Indexed: 04/29/2023] Open
Abstract
Vaginal dysbiosis is characterized by a decrease in the relative abundance of Lactobacillus species in favor of other species. This condition facilitates infections by sexually transmitted pathogens including high risk (HR)-human papilloma viruses (HPVs) involved in the development of cervical cancer. Some vaginal dysbiosis bacteria contribute to the neoplastic progression by inducing chronic inflammation and directly activating molecular pathways involved in carcinogenesis. In this study, SiHa cells, an HPV-16-transformed epithelial cell line, were exposed to different representative vaginal microbial communities. The expression of the HPV oncogenes E6 and E7 and the production of relative oncoproteins was evaluated. The results showed that Lactobacillus crispatus and Lactobacillus gasseri modulated the basal expression of the E6 and E7 genes of SiHa cells and the production of the E6 and E7 oncoproteins. Vaginal dysbiosis bacteria had contrasting effects on E6/E7 gene expression and protein production. The expression of the E6 and E7 genes and the production of the relative oncoproteins was increased by strains of Gardnerella vaginalis and, to a lesser extent, by Megasphaera micronuciformis. In contrast, Prevotella bivia decreased the expression of oncogenes and the production of the E7 protein. A decreased amount of p53 and pRb was found in the cultures of SiHa cells with M. micronuciformis, and accordingly, in the same cultures, a higher percentage of cells progressed to the S-phase of the cell cycle compared to the untreated or Lactobacillus-stimulated cultures. These data confirm that L. crispatus represents the most protective component of the vaginal microbiota against neoplastic progression of HR-HPV infected cells, while M. micronuciformis and, to a lesser extent, G. vaginalis may directly interfere in the oncogenic process, inducing or maintaining the production of viral oncoproteins.
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Affiliation(s)
- Sabrina Nicolò
- Department of Clinical and Experimental Medicine, University of Florence, 50134 Florence, Italy
| | - Alberto Antonelli
- Department of Clinical and Experimental Medicine, University of Florence, 50134 Florence, Italy
- Clinical Microbiology and Virology Unit, Careggi University Hospital, 50139 Florence, Italy
| | - Michele Tanturli
- Department of Clinical and Experimental Medicine, University of Florence, 50134 Florence, Italy
| | - Ilaria Baccani
- Department of Clinical and Experimental Medicine, University of Florence, 50134 Florence, Italy
- Clinical Microbiology and Virology Unit, Careggi University Hospital, 50139 Florence, Italy
| | - Chiara Bonaiuto
- Department of Clinical and Experimental Medicine, University of Florence, 50134 Florence, Italy
- Clinical Microbiology and Virology Unit, Careggi University Hospital, 50139 Florence, Italy
| | - Giuseppe Castronovo
- Department of Clinical and Experimental Medicine, University of Florence, 50134 Florence, Italy
| | - Gian Maria Rossolini
- Department of Clinical and Experimental Medicine, University of Florence, 50134 Florence, Italy
- Clinical Microbiology and Virology Unit, Careggi University Hospital, 50139 Florence, Italy
| | - G Mattiuz
- Department of Clinical and Experimental Medicine, University of Florence, 50134 Florence, Italy
| | - M G Torcia
- Department of Clinical and Experimental Medicine, University of Florence, 50134 Florence, Italy
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Tubita A, Lombardi Z, Tusa I, Lazzeretti A, Sgrignani G, Papini D, Menconi A, Gagliardi S, Lulli M, Dello Sbarba P, Esparís-Ogando A, Pandiella A, Stecca B, Rovida E. Inhibition of ERK5 Elicits Cellular Senescence in Melanoma via the Cyclin-Dependent Kinase Inhibitor p21. Cancer Res 2022; 82:447-457. [PMID: 34799355 PMCID: PMC9397638 DOI: 10.1158/0008-5472.can-21-0993] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Revised: 10/06/2021] [Accepted: 11/15/2021] [Indexed: 01/07/2023]
Abstract
Melanoma is the deadliest skin cancer with a very poor prognosis in advanced stages. Although targeted and immune therapies have improved survival, not all patients benefit from these treatments. The mitogen-activated protein kinase ERK5 supports the growth of melanoma cells in vitro and in vivo. However, ERK5 inhibition results in cell-cycle arrest rather than appreciable apoptosis. To clarify the role of ERK5 in melanoma growth, we performed transcriptomic analyses following ERK5 knockdown in melanoma cells expressing BRAFV600E and found that cellular senescence was among the most affected processes. In melanoma cells expressing either wild-type or mutant (V600E) BRAF, both genetic and pharmacologic inhibition of ERK5 elicited cellular senescence, as observed by a marked increase in senescence-associated β-galactosidase activity and p21 expression. In addition, depletion of ERK5 from melanoma cells resulted in increased levels of CXCL1, CXCL8, and CCL20, proteins typically involved in the senescence-associated secretory phenotype. Knockdown of p21 suppressed the induction of cellular senescence by ERK5 blockade, pointing to p21 as a key mediator of this process. In vivo, ERK5 knockdown or inhibition with XMD8-92 in melanoma xenografts promoted cellular senescence. Based on these results, small-molecule compounds targeting ERK5 constitute a rational series of prosenescence drugs that may be exploited for melanoma treatment. SIGNIFICANCE: This study shows that targeting ERK5 induces p21-mediated cellular senescence in melanoma, identifying a prosenescence effect of ERK5 inhibitors that may be exploited for melanoma treatment.
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Affiliation(s)
- Alessandro Tubita
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
| | - Zoe Lombardi
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
| | - Ignazia Tusa
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
| | - Azzurra Lazzeretti
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
| | - Giovanna Sgrignani
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
| | - Dimitri Papini
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
| | - Alessio Menconi
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
| | - Sinforosa Gagliardi
- Core Research Laboratory - Institute for Cancer Research and Prevention (ISPRO), Florence, Italy
| | - Matteo Lulli
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
| | - Persio Dello Sbarba
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
| | - Azucena Esparís-Ogando
- Instituto de Biología Molecular y Celular del Cáncer (IBMCC-CIC), Instituto de Investigación Biomédica de Salamanca (IBSAL), CIBERONC, Salamanca, Spain
| | - Atanasio Pandiella
- Instituto de Biología Molecular y Celular del Cáncer (IBMCC-CIC), Instituto de Investigación Biomédica de Salamanca (IBSAL), CIBERONC, Salamanca, Spain
- CSIC, Salamanca, Spain
| | - Barbara Stecca
- Core Research Laboratory - Institute for Cancer Research and Prevention (ISPRO), Florence, Italy
| | - Elisabetta Rovida
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy.
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Yoshida T, Yamasaki K, Tadagaki K, Kuwahara Y, Matsumoto A, Sofovic AE, Kondo N, Sakai T, Okuda T. Tumor necrosis factor‑related apoptosis‑inducing ligand is a novel transcriptional target of runt‑related transcription factor 1. Int J Oncol 2021; 60:6. [PMID: 34958111 PMCID: PMC8727134 DOI: 10.3892/ijo.2021.5296] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Accepted: 11/23/2021] [Indexed: 11/26/2022] Open
Abstract
Runt-related transcription factor 1 (RUNX1), which is also known as acute myeloid leukemia 1 (AML1), has been frequently found with genomic aberrations in human leukemia. RUNX1 encodes a transcription factor that can regulate the expression of hematopoietic genes. In addition, tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) performs an important function for malignant tumors in immune surveillance. However, the regulatory mechanism of TRAIL expression remain to be fully elucidated. In the present study, tetradecanoylphorbol 13-acetate-treated megakaryocytic differentiated K562 cells was used to examine the effect of RUNX1 on TRAIL expression. Luciferase assay series of TRAIL promoters for the cells co-transfected with RUNX1 and core-binding factor β (CBFβ) expression vectors were performed to evaluate the nature of TRAIL transcriptional regulation. Electrophoresis mobility shift assay of the RUNX1 consensus sequence of the TRAIL promoter with recombinant RUNX1 and CBFβ proteins was also performed. BloodSpot database analysis for TRAIL expression in patients with acute myeloid leukemia were performed. The expression of TRAIL, its receptor Death receptor 4 and 5 and RUNX1 in K562 cells transfected with the RUNX1 expression vector and RUNX1 siRNA were evaluated by reverse transcription-quantitative PCR (RT-qPCR). TRAIL and RUNX1-ETO expression was also measured in Kasumi-1 cells transfected with RUNX1-ETO siRNA and in KG-1 cells transfected with RUNX1-ETO expression plasmid, both by RT-qPCR. Cell counting, lactate dehydrogenase assay and cell cycle analysis by flow cytometry were performed on Kasumi-1, KG-1, SKNO-1 and K562 cells treated with TRAIL and HDAC inhibitors sodium butyrate or valproic acid. The present study demonstrated that RUNX1 is a transcriptional regulator of TRAIL. It was initially found that the induction of TRAIL expression following the megakaryocytic differentiation of human leukemia cells was RUNX1-dependent. Subsequently, overexpression of RUNX1 was found to increase TRAIL mRNA expression by activating its promoter activity. Additional analyses revealed that RUNX1 regulated the expression of TRAIL in an indirect manner, because RUNX1 retained its ability to activate this promoter following the mutation of all possible RUNX1 consensus sites. Furthermore, TRAIL expression was reduced in leukemia cells carrying the t(8;21) translocation, where the RUNX1-ETO chimeric protein interfere with normal RUNX1 function. Exogenous treatment of recombinant TRAIL proteins was found to induce leukemia cell death. To conclude, the present study provided a novel mechanism, whereby TRAIL is a target gene of RUNX1 and TRAIL expression was inhibited by RUNX1-ETO. These results suggest that TRAIL is a promising agent for the clinical treatment of t(8;21) AML.
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Affiliation(s)
- Tatsushi Yoshida
- Department of Biochemistry and Molecular Biology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kawaramachi‑Hirokoji, Kamigyo‑ku, Kyoto 602‑8566, Japan
| | - Kenta Yamasaki
- Department of Biochemistry and Molecular Biology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kawaramachi‑Hirokoji, Kamigyo‑ku, Kyoto 602‑8566, Japan
| | - Kenjiro Tadagaki
- Department of Biochemistry and Molecular Biology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kawaramachi‑Hirokoji, Kamigyo‑ku, Kyoto 602‑8566, Japan
| | - Yasumichi Kuwahara
- Department of Biochemistry and Molecular Biology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kawaramachi‑Hirokoji, Kamigyo‑ku, Kyoto 602‑8566, Japan
| | - Akifumi Matsumoto
- Department of Biochemistry and Molecular Biology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kawaramachi‑Hirokoji, Kamigyo‑ku, Kyoto 602‑8566, Japan
| | - Adèm Ejub Sofovic
- Department of Biochemistry and Molecular Biology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kawaramachi‑Hirokoji, Kamigyo‑ku, Kyoto 602‑8566, Japan
| | - Noriko Kondo
- Department of Biochemistry and Molecular Biology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kawaramachi‑Hirokoji, Kamigyo‑ku, Kyoto 602‑8566, Japan
| | - Toshiyuki Sakai
- Department of Drug Discovery Medicine, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kawaramachi‑Hirokoji, Kamigyo‑ku, Kyoto 602‑8566, Japan
| | - Tsukasa Okuda
- Department of Biochemistry and Molecular Biology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kawaramachi‑Hirokoji, Kamigyo‑ku, Kyoto 602‑8566, Japan
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Tusa I, Gagliardi S, Tubita A, Pandolfi S, Menconi A, Lulli M, Dello Sbarba P, Stecca B, Rovida E. The Hedgehog-GLI Pathway Regulates MEK5-ERK5 Expression and Activation in Melanoma Cells. Int J Mol Sci 2021; 22:11259. [PMID: 34681917 PMCID: PMC8538987 DOI: 10.3390/ijms222011259] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Revised: 10/08/2021] [Accepted: 10/12/2021] [Indexed: 12/28/2022] Open
Abstract
Malignant melanoma is the deadliest skin cancer, with a poor prognosis in advanced stages. We recently showed that the extracellular signal-regulated kinase 5 (ERK5), encoded by the MAPK7 gene, plays a pivotal role in melanoma by regulating cell functions necessary for tumour development, such as proliferation. Hedgehog-GLI signalling is constitutively active in melanoma and is required for proliferation. However, no data are available in literature about a possible interplay between Hedgehog-GLI and ERK5 pathways. Here, we show that hyperactivation of the Hedgehog-GLI pathway by genetic inhibition of the negative regulator Patched 1 increases the amount of ERK5 mRNA and protein. Chromatin immunoprecipitation showed that GLI1, the major downstream effector of Hedgehog-GLI signalling, binds to a functional non-canonical GLI consensus sequence at the MAPK7 promoter. Furthermore, we found that ERK5 is required for Hedgehog-GLI-dependent melanoma cell proliferation, and that the combination of GLI and ERK5 inhibitors is more effective than single treatments in reducing cell viability and colony formation ability in melanoma cells. Together, these findings led to the identification of a novel Hedgehog-GLI-ERK5 axis that regulates melanoma cell growth, and shed light on new functions of ERK5, paving the way for new therapeutic options in melanoma and other neoplasms with active Hedgehog-GLI and ERK5 pathways.
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Affiliation(s)
- Ignazia Tusa
- Department of Experimental and Clinical Biomedical Sciences “Mario Serio”, University of Florence, 50134 Florence, Italy; (I.T.); (A.T.); (A.M.); (M.L.); (P.D.S.)
| | - Sinforosa Gagliardi
- Core Research Laboratory-Institute for Cancer Research and Prevention (ISPRO), 50134 Florence, Italy; (S.G.); (S.P.)
| | - Alessandro Tubita
- Department of Experimental and Clinical Biomedical Sciences “Mario Serio”, University of Florence, 50134 Florence, Italy; (I.T.); (A.T.); (A.M.); (M.L.); (P.D.S.)
| | - Silvia Pandolfi
- Core Research Laboratory-Institute for Cancer Research and Prevention (ISPRO), 50134 Florence, Italy; (S.G.); (S.P.)
| | - Alessio Menconi
- Department of Experimental and Clinical Biomedical Sciences “Mario Serio”, University of Florence, 50134 Florence, Italy; (I.T.); (A.T.); (A.M.); (M.L.); (P.D.S.)
| | - Matteo Lulli
- Department of Experimental and Clinical Biomedical Sciences “Mario Serio”, University of Florence, 50134 Florence, Italy; (I.T.); (A.T.); (A.M.); (M.L.); (P.D.S.)
| | - Persio Dello Sbarba
- Department of Experimental and Clinical Biomedical Sciences “Mario Serio”, University of Florence, 50134 Florence, Italy; (I.T.); (A.T.); (A.M.); (M.L.); (P.D.S.)
| | - Barbara Stecca
- Core Research Laboratory-Institute for Cancer Research and Prevention (ISPRO), 50134 Florence, Italy; (S.G.); (S.P.)
| | - Elisabetta Rovida
- Department of Experimental and Clinical Biomedical Sciences “Mario Serio”, University of Florence, 50134 Florence, Italy; (I.T.); (A.T.); (A.M.); (M.L.); (P.D.S.)
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Tusa I, Cheloni G, Poteti M, Silvano A, Tubita A, Lombardi Z, Gozzini A, Caporale R, Scappini B, Dello Sbarba P, Rovida E. In Vitro Comparison of the Effects of Imatinib and Ponatinib on Chronic Myeloid Leukemia Progenitor/Stem Cell Features. Target Oncol 2020; 15:659-671. [PMID: 32780298 PMCID: PMC7568716 DOI: 10.1007/s11523-020-00741-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Background The development of molecularly tailored therapeutic agents such as the BCR/ABL-active tyrosine kinase inhibitors (TKi) resulted in an excellent treatment option for chronic myeloid leukemia (CML) patients. However, following TKi discontinuation, disease relapses in 40–60% of patients, an occurrence very likely due to the persistence of leukemic stem cells that are scarcely sensitive to TKi. Nevertheless, TKi are still the only current treatment option for CML patients. Objective The aim of this study was to compare the effects of TKi belonging to different generations, imatinib and ponatinib (first and third generation, respectively), on progenitor/stem cell expansion potential and markers. Patients and Methods We used stabilized CML cell lines (KCL22, K562 and LAMA-84 cells), taking advantage of the previous demonstration of ours that cell lines contain cell subsets endowed with progenitor/stem cell properties. Primary cells explanted from CML patients were also used. The effects of TKi on the expression of stem cell related genes were compared by quantitative PCR. Flow cytometry was performed to evaluate aldehyde-dehydrogenase (ALDH) activity and the expression of cluster of differentiation (CD) cell surface hematopoietic stem cell markers. Progenitor/stem cell potential was estimated by serial colony formation ability (CFA) assay. Results Ponatinib was more effective than imatinib for the reduction of cells with ALDH activity and progenitor/stem cell potential of CML patient-derived cells and cell lines. Furthermore, ponatinib was more effective than imatinib in reducing the percentage of CD26-expressing cells in primary CML cells, whereas imatinib and ponatinib showed similar efficacy on KCL22 cells. Both drugs strongly upregulated NANOG and SOX2 in CML cell lines, but in KCL22 cells this upregulation was significantly lower with ponatinib than with imatinib, an outcome compatible with a lower level of enrichment of the stem cell compartment upon ponatinib treatment. Conclusion Ponatinib seems to target CML progenitor/stem cells better than imatinib. Electronic supplementary material The online version of this article (10.1007/s11523-020-00741-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Ignazia Tusa
- Department of Experimental and Clinical Biomedical Science, University of Florence, Viale GB Morgagni 50, 50134, Florence, Italy
| | - Giulia Cheloni
- Department of Experimental and Clinical Biomedical Science, University of Florence, Viale GB Morgagni 50, 50134, Florence, Italy
| | - Martina Poteti
- Department of Experimental and Clinical Biomedical Science, University of Florence, Viale GB Morgagni 50, 50134, Florence, Italy
| | - Angela Silvano
- Department of Experimental and Clinical Biomedical Science, University of Florence, Viale GB Morgagni 50, 50134, Florence, Italy
| | - Alessandro Tubita
- Department of Experimental and Clinical Biomedical Science, University of Florence, Viale GB Morgagni 50, 50134, Florence, Italy
| | - Zoe Lombardi
- Department of Experimental and Clinical Biomedical Science, University of Florence, Viale GB Morgagni 50, 50134, Florence, Italy
| | | | - Roberto Caporale
- Dipartimento DAI Oncologico e di Chirurgia ad Indirizzo Robotico SOD Centro Diagnostico di Citofluorimetria e Immunoterapia, AOU Careggi, Florence, Italy
| | | | - Persio Dello Sbarba
- Department of Experimental and Clinical Biomedical Science, University of Florence, Viale GB Morgagni 50, 50134, Florence, Italy.
| | - Elisabetta Rovida
- Department of Experimental and Clinical Biomedical Science, University of Florence, Viale GB Morgagni 50, 50134, Florence, Italy.
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Bono S, Lulli M, D'Agostino VG, Di Gesualdo F, Loffredo R, Cipolleschi MG, Provenzani A, Rovida E, Dello Sbarba P. Different BCR/Abl protein suppression patterns as a converging trait of chronic myeloid leukemia cell adaptation to energy restriction. Oncotarget 2018; 7:84810-84825. [PMID: 27852045 PMCID: PMC5356700 DOI: 10.18632/oncotarget.13319] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Accepted: 10/28/2016] [Indexed: 02/07/2023] Open
Abstract
BCR/Abl protein drives the onset and progression of Chronic Myeloid Leukemia (CML). We previously showed that BCR/Abl protein is suppressed in low oxygen, where viable cells retain stem cell potential. This study addressed the regulation of BCR/Abl protein expression under oxygen or glucose shortage, characteristic of the in vivo environment where cells resistant to tyrosine kinase inhibitors (TKi) persist. We investigated, at transcriptional, translational and post-translational level, the mechanisms involved in BCR/Abl suppression in K562 and KCL22 CML cells. BCR/abl mRNA steady-state analysis and ChIP-qPCR on BCR promoter revealed that BCR/abl transcriptional activity is reduced in K562 cells under oxygen shortage. The SUnSET assay showed an overall reduction of protein synthesis under oxygen/glucose shortage in both cell lines. However, only low oxygen decreased polysome-associated BCR/abl mRNA significantly in KCL22 cells, suggesting a decreased BCR/Abl translation. The proteasome inhibitor MG132 or the pan-caspase inhibitor z-VAD-fmk extended BCR/Abl expression under oxygen/glucose shortage in K562 cells. Glucose shortage induced autophagy-dependent BCR/Abl protein degradation in KCL22 cells. Overall, our results showed that energy restriction induces different cell-specific BCR/Abl protein suppression patterns, which represent a converging route to TKi-resistance of CML cells. Thus, the interference with BCR/Abl expression in environment-adapted CML cells may become a useful implement to current therapy.
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Affiliation(s)
- Silvia Bono
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", Università degli Studi di Firenze, Florence, Italy
| | - Matteo Lulli
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", Università degli Studi di Firenze, Florence, Italy
| | | | - Federico Di Gesualdo
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", Università degli Studi di Firenze, Florence, Italy
| | - Rosa Loffredo
- Centre For Integrative Biology (CIBIO), Università degli Studi di Trento, Trento, Italy
| | - Maria Grazia Cipolleschi
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", Università degli Studi di Firenze, Florence, Italy
| | - Alessandro Provenzani
- Centre For Integrative Biology (CIBIO), Università degli Studi di Trento, Trento, Italy
| | - Elisabetta Rovida
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", Università degli Studi di Firenze, Florence, Italy
| | - Persio Dello Sbarba
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", Università degli Studi di Firenze, Florence, Italy
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The Leukemic Stem Cell Niche: Adaptation to "Hypoxia" versus Oncogene Addiction. Stem Cells Int 2017; 2017:4979474. [PMID: 29118813 PMCID: PMC5651121 DOI: 10.1155/2017/4979474] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Accepted: 04/05/2017] [Indexed: 02/08/2023] Open
Abstract
Previous studies based on low oxygen concentrations in the incubation atmosphere revealed that metabolic factors govern the maintenance of normal hematopoietic or leukemic stem cells (HSC and LSC). The physiological oxygen concentration in tissues ranges between 0.1 and 5.0%. Stem cell niches (SCN) are placed in tissue areas at the lower end of this range (“hypoxic” SCN), to which stem cells are metabolically adapted and where they are selectively hosted. The data reported here indicated that driver oncogenic proteins of several leukemias are suppressed following cell incubation at oxygen concentration compatible with SCN physiology. This suppression is likely to represent a key positive regulator of LSC survival and maintenance (self-renewal) within the SCN. On the other hand, LSC committed to differentiation, unable to stand suppression because of addiction to oncogenic signalling, would be unfit to home in SCN. The loss of oncogene addiction in SCN-adapted LSC has a consequence of crucial practical relevance: the refractoriness to inhibitors of the biological activity of oncogenic protein due to the lack of their molecular target. Thus, LSC hosted in SCN are suited to sustain the long-term maintenance of therapy-resistant minimal residual disease.
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Lee SH, Manandhar S, Lee YM. Roles of RUNX in Hypoxia-Induced Responses and Angiogenesis. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 962:449-469. [PMID: 28299673 DOI: 10.1007/978-981-10-3233-2_27] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
During the past two decades, Runt domain transcription factors (RUNX1, 2, and 3) have been investigated in regard to their function, structural elements, genetic variants, and roles in normal development and pathological conditions. The Runt family proteins are evolutionarily conserved from Drosophila to mammals, emphasizing their physiological importance. A hypoxic microenvironment caused by insufficient blood supply is frequently observed in developing organs, growing tumors, and tissues that become ischemic due to impairment or blockage of blood vessels. During embryonic development and tumor growth, hypoxia triggers a stress response that overcomes low-oxygen conditions by increasing erythropoiesis and angiogenesis and triggering metabolic changes. This review briefly introduces hypoxic conditions and cellular responses, as well as angiogenesis and its related signaling pathways, and then describes our current knowledge on the functions and molecular mechanisms of Runx family proteins in hypoxic responses, especially in angiogenesis.
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Affiliation(s)
- Sun Hee Lee
- National Basic Research Laboratory of Vascular Homeostasis Regulation, BK21 Plus KNU Multi-Omics based Creative Drug Research Team, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Kyungpook National University, Daegu, 41566, South Korea
| | - Sarala Manandhar
- National Basic Research Laboratory of Vascular Homeostasis Regulation, BK21 Plus KNU Multi-Omics based Creative Drug Research Team, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Kyungpook National University, Daegu, 41566, South Korea
| | - You Mie Lee
- National Basic Research Laboratory of Vascular Homeostasis Regulation, BK21 Plus KNU Multi-Omics based Creative Drug Research Team, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Kyungpook National University, Daegu, 41566, South Korea.
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Digiacomo G, Tusa I, Bacci M, Cipolleschi MG, Dello Sbarba P, Rovida E. Fibronectin induces macrophage migration through a SFK-FAK/CSF-1R pathway. Cell Adh Migr 2016; 11:327-337. [PMID: 27588738 DOI: 10.1080/19336918.2016.1221566] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Integrins, following binding to proteins of the extracellular matrix (ECM) including collagen, laminin and fibronectin (FN), are able to transduce molecular signals inside the cells and to regulate several biological functions such as migration, proliferation and differentiation. Besides activation of adaptor molecules and kinases, integrins transactivate Receptor Tyrosine Kinases (RTK). In particular, adhesion to the ECM may promote RTK activation in the absence of growth factors. The Colony-Stimulating Factor-1 Receptor (CSF-1R) is a RTK that supports the survival, proliferation, and motility of monocytes/macrophages, which are essential components of innate immunity and cancer development. Macrophage interaction with FN is recognized as an important aspect of host defense and wound repair. The aim of the present study was to investigate on a possible cross-talk between FN-elicited signals and CSF-1R in macrophages. FN induced migration in BAC1.2F5 and J774 murine macrophage cell lines and in human primary macrophages. Adhesion to FN determined phosphorylation of the Focal Adhesion Kinase (FAK) and Src Family Kinases (SFK) and activation of the SFK/FAK complex, as witnessed by paxillin phosphorylation. SFK activity was necessary for FAK activation and macrophage migration. Moreover, FN-induced migration was dependent on FAK in either murine macrophage cell lines or human primary macrophages. FN also induced FAK-dependent/ligand-independent CSF-1R phosphorylation, as well as the interaction between CSF-1R and β1. CSF-1R activity was necessary for FN-induced macrophage migration. Indeed, genetic or pharmacological inhibition of CSF-1R prevented FN-induced macrophage migration. Our results identified a new SFK-FAK/CSF-1R signaling pathway that mediates FN-induced migration of macrophages.
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Affiliation(s)
- Graziana Digiacomo
- a Department of Experimental and Clinical Biomedical Sciences , Università degli Studi di Firenze and Istituto Toscano Tumori , Florence , Italy
| | - Ignazia Tusa
- a Department of Experimental and Clinical Biomedical Sciences , Università degli Studi di Firenze and Istituto Toscano Tumori , Florence , Italy
| | - Marina Bacci
- a Department of Experimental and Clinical Biomedical Sciences , Università degli Studi di Firenze and Istituto Toscano Tumori , Florence , Italy
| | - Maria Grazia Cipolleschi
- a Department of Experimental and Clinical Biomedical Sciences , Università degli Studi di Firenze and Istituto Toscano Tumori , Florence , Italy
| | - Persio Dello Sbarba
- a Department of Experimental and Clinical Biomedical Sciences , Università degli Studi di Firenze and Istituto Toscano Tumori , Florence , Italy
| | - Elisabetta Rovida
- a Department of Experimental and Clinical Biomedical Sciences , Università degli Studi di Firenze and Istituto Toscano Tumori , Florence , Italy
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10
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Del Poggetto E, Tanturli M, Ben-Califa N, Gozzini A, Tusa I, Cheloni G, Marzi I, Cipolleschi MG, Kashman Y, Neumann D, Rovida E, Dello Sbarba P. Salarin C inhibits the maintenance of chronic myeloid leukemia progenitor cells. Cell Cycle 2016; 14:3146-54. [PMID: 26291130 DOI: 10.1080/15384101.2015.1078029] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Abstract
We previously showed that incubation of chronic myeloid leukemia (CML) cells in very low oxygen selects a cell subset where the oncogenetic BCR/Abl protein is suppressed and which is thereby refractory to tyrosine kinase inhibitors used for CML therapy. In this study, salarin C, an anticancer macrolide extracted from the Fascaplysinopsis sponge, was tested as for its activity on CML cells, especially after their incubation in atmosphere at 0.1% oxygen. Salarin C induced mitotic cycle arrest, apoptosis and DNA damage. Salarin C also concentration-dependently inhibited the maintenance of stem cell potential in cultures in low oxygen of either CML cell lines or primary cells. Surprisingly, the drug also concentration-dependently enforced the maintenance of BCR/Abl signaling in low oxygen, an effect which was paralleled by the rescue of sensitivity of stem cell potential to IM. These results suggest a potential use of salarin C for the suppression of CML cells refractory to tyrosine kinase inhibitors.
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Affiliation(s)
- E Del Poggetto
- a Department of Experimental and Clinical Biomedical Sciences "Mario Serio" ; Universita degli Studi di Firenze ; Florence , Italy
| | - M Tanturli
- a Department of Experimental and Clinical Biomedical Sciences "Mario Serio" ; Universita degli Studi di Firenze ; Florence , Italy
| | - N Ben-Califa
- b Department of Cell and Developmental Biology; Sackler Faculty of Medicine ; Tel Aviv University ; Tel Aviv , Israel
| | - A Gozzini
- c Hematology Unit; "Careggi" University Hospital ; Florence , Italy
| | - I Tusa
- a Department of Experimental and Clinical Biomedical Sciences "Mario Serio" ; Universita degli Studi di Firenze ; Florence , Italy
| | - G Cheloni
- a Department of Experimental and Clinical Biomedical Sciences "Mario Serio" ; Universita degli Studi di Firenze ; Florence , Italy
| | - I Marzi
- a Department of Experimental and Clinical Biomedical Sciences "Mario Serio" ; Universita degli Studi di Firenze ; Florence , Italy
| | - M G Cipolleschi
- a Department of Experimental and Clinical Biomedical Sciences "Mario Serio" ; Universita degli Studi di Firenze ; Florence , Italy
| | - Y Kashman
- d School of Chemistry ; Tel Aviv University ; Tel Aviv , Israel
| | - D Neumann
- b Department of Cell and Developmental Biology; Sackler Faculty of Medicine ; Tel Aviv University ; Tel Aviv , Israel
| | - E Rovida
- a Department of Experimental and Clinical Biomedical Sciences "Mario Serio" ; Universita degli Studi di Firenze ; Florence , Italy
| | - P Dello Sbarba
- a Department of Experimental and Clinical Biomedical Sciences "Mario Serio" ; Universita degli Studi di Firenze ; Florence , Italy
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11
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McGrath JP, Williamson KE, Balasubramanian S, Odate S, Arora S, Hatton C, Edwards TM, O'Brien T, Magnuson S, Stokoe D, Daniels DL, Bryant BM, Trojer P. Pharmacological Inhibition of the Histone Lysine Demethylase KDM1A Suppresses the Growth of Multiple Acute Myeloid Leukemia Subtypes. Cancer Res 2016; 76:1975-88. [DOI: 10.1158/0008-5472.can-15-2333] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2015] [Accepted: 12/22/2015] [Indexed: 11/16/2022]
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12
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Cannito S, Turato C, Paternostro C, Biasiolo A, Colombatto S, Cambieri I, Quarta S, Novo E, Morello E, Villano G, Fasolato S, Musso T, David E, Tusa I, Rovida E, Autelli R, Smedile A, Cillo U, Pontisso P, Parola M. Hypoxia up-regulates SERPINB3 through HIF-2α in human liver cancer cells. Oncotarget 2016; 6:2206-21. [PMID: 25544768 PMCID: PMC4385846 DOI: 10.18632/oncotarget.2943] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Accepted: 12/09/2014] [Indexed: 02/04/2023] Open
Abstract
SERPINB3 is a cysteine-proteases inhibitor up-regulated in a significant number of cirrhotic patients carrying hepatocellular carcinoma (HCC) and recently proposed as a prognostic marker for HCC early recurrence. SERPINB3 has been reported to stimulate proliferation, inhibit apoptosis and, similar to what reported for hypoxia, to trigger epithelial-to-mesenchymal transition (EMT) and increased invasiveness in liver cancer cells. This study has investigated whether SERPINB3 expression is regulated by hypoxia-related mechanisms in liver cancer cells. Exposure of HepG2 and Huh7 cells to hypoxia up-regulated SERPINB3 transcription, protein synthesis and release in the extracellular medium. Hypoxia-dependent SERPINB3 up-regulation was selective (no change detected for SERPINB4) and operated through hypoxia inducible factor (HIF)-2α (not HIF-1α) binding to SERPINB3 promoter, as confirmed by chromatin immuno-precipitation assay and silencing experiments employing specific siRNAs. HIF-2α-mediated SERPINB3 up-regulation under hypoxic conditions required intracellular generation of ROS. Immuno-histochemistry (IHC) and transcript analysis, performed in human HCC specimens, revealed co-localization of the two proteins in liver cancer cells and the existence of a positive correlation between HIF-2α and SERPINB3 transcript levels, respectively. Hypoxia, through HIF-2α-dependent and redox-sensitive mechanisms, up-regulates the transcription, synthesis and release of SERPINB3, a molecule with a high oncogenic potential.
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Affiliation(s)
- Stefania Cannito
- Department of Clinical and Biological Sciences, Unit of Experimental Medicine and Interuniversity Center for Liver Pathophysiology, University of Torino, Italy
| | | | - Claudia Paternostro
- Department of Clinical and Biological Sciences, Unit of Experimental Medicine and Interuniversity Center for Liver Pathophysiology, University of Torino, Italy
| | | | | | - Irene Cambieri
- Department of Plastic Surgery and Burn Unit Skin Bank, CTO Hospital, Torino, Italy
| | | | - Erica Novo
- Department of Clinical and Biological Sciences, Unit of Experimental Medicine and Interuniversity Center for Liver Pathophysiology, University of Torino, Italy
| | - Elisabetta Morello
- Department of Clinical and Biological Sciences, Unit of Experimental Medicine and Interuniversity Center for Liver Pathophysiology, University of Torino, Italy
| | | | | | - Tiziana Musso
- Department of Public Health and Pediatric Sciences, University of Torino, Italy
| | - Ezio David
- Pathology Unit, San Giovanni Battista Hospital, Torino, Italy
| | - Ignazia Tusa
- Department of Biomedical, Experimental and Clinical Sciences "Mario Serio", University of Firenze, Italy
| | - Elisabetta Rovida
- Department of Biomedical, Experimental and Clinical Sciences "Mario Serio", University of Firenze, Italy
| | - Riccardo Autelli
- Department of Clinical and Biological Sciences, Unit of Experimental Medicine and Interuniversity Center for Liver Pathophysiology, University of Torino, Italy
| | - Antonina Smedile
- Gastroenterology and Hepatology Division, San Giovanni Battista Hospital, Torino, Italy
| | - Umberto Cillo
- Unit of Hepatobiliary Surgery and Liver Transplantation, University of Padova, Italy
| | | | - Maurizio Parola
- Department of Clinical and Biological Sciences, Unit of Experimental Medicine and Interuniversity Center for Liver Pathophysiology, University of Torino, Italy
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13
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An RNA interference screen identifies new avenues for nephroprotection. Cell Death Differ 2015; 23:608-15. [PMID: 26564400 DOI: 10.1038/cdd.2015.128] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2015] [Revised: 08/03/2015] [Accepted: 08/20/2015] [Indexed: 01/28/2023] Open
Abstract
Acute kidney injury is a major public health problem, which is commonly caused by renal ischemia and is associated with a high risk of mortality and long-term disability. Efforts to develop a treatment for this condition have met with very limited success. We used an RNA interference screen to identify genes (BCL2L14, BLOC1S2, C2ORF42, CPT1A, FBP1, GCNT3, RHOB, SCIN, TACR1, and TNFAIP6) whose suppression improves survival of kidney epithelial cells in in vitro models of oxygen and glucose deprivation. Some of the genes also modulate the toxicity of cisplatin, an anticancer agent whose use is currently limited by nephrotoxicity. Furthermore, pharmacological inhibition of TACR1 product NK1R was protective in a model of mouse renal ischemia, attesting to the in vivo relevance of our findings. These data shed new light on the mechanisms of stress response in mammalian cells, and open new avenues to reduce the morbidity and mortality associated with renal injury.
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14
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Digiacomo G, Ziche M, Dello Sbarba P, Donnini S, Rovida E. Prostaglandin E2 transactivates the colony‐stimulating factor‐1 receptor and synergizes with colony‐stimulating factor‐1 in the induction of macrophage migration
via
the mitogen‐activated protein kinase ERK1/2. FASEB J 2015; 29:2545-54. [DOI: 10.1096/fj.14-258939] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Accepted: 02/17/2015] [Indexed: 11/11/2022]
Affiliation(s)
- Graziana Digiacomo
- Dipartimento di Scienze Biomediche Sperimentali e Cliniche “Mario Serio”Università degli Studi di FirenzeFlorenceItaly
- Istituto Toscano TumoriFlorenceItaly
| | - Marina Ziche
- Dipartimento di Scienze della VitaUniversità degli Studi di SienaSienaItaly
- Istituto Toscano TumoriFlorenceItaly
| | - Persio Dello Sbarba
- Dipartimento di Scienze Biomediche Sperimentali e Cliniche “Mario Serio”Università degli Studi di FirenzeFlorenceItaly
- Istituto Toscano TumoriFlorenceItaly
| | - Sandra Donnini
- Dipartimento di Scienze della VitaUniversità degli Studi di SienaSienaItaly
- Istituto Toscano TumoriFlorenceItaly
| | - Elisabetta Rovida
- Dipartimento di Scienze Biomediche Sperimentali e Cliniche “Mario Serio”Università degli Studi di FirenzeFlorenceItaly
- Istituto Toscano TumoriFlorenceItaly
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15
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Rogalska A, Marczak A. Epothilone B induces human ovarian cancer OV-90 cell apoptosis via external pathway. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2015; 39:700-712. [PMID: 25721485 DOI: 10.1016/j.etap.2015.01.023] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2014] [Revised: 01/28/2015] [Accepted: 01/31/2015] [Indexed: 06/04/2023]
Abstract
We evaluated molecular events associated with apoptosis induced by Epothilone B (EpoB, Patupilone) and paclitaxel (PTX) in human ovarian papillary serous adenocarcinoma cell line (OV-90). Epothilones are compounds of natural origin with mechanisms of action similar to taxanes, but with more potent antiproliferative activity. Apoptosis was one of the major forms of cell death induced by EpoB. The mode of cell death was assessed colorimetrically, fluorimetrically, cytometry, and by immunoblot analyses through measuring DNA fragmentation, the level of TRAIL, the cleavage of poly(ADP-ribose) polymerase (PARP) and the activation of caspase-9, -8 and -3. We measured also additional markers of apoptosis, like phosphatidylserine externalization and morphological changes. Moreover, we estimated glycoprotein P (P-gp) activity in OV-90 ovarian cancer cell line. The studies indicated that the extrinsic pathway of apoptosis, which is triggered by certain TNF family members and engages their respective receptors on the surface of the target cell, was predominant. We were the first to have demonstrated (using immunoassay) the release of TNF-related apoptosis-inducing ligand (TRAIL) after treatment with EpoB. EpoB and PTX mediate activation of both initiator caspases-8 and -9, leading to the appearance of caspase-3. In EpoB treated cells, DNA fragmentation was also detected. EpoB leads to the reduction in DNA repair capacity. In summary, we report that Epothilone B induces apoptosis in OV-90 cells via a TRAIL and caspase 8-dependent pathway. PTX leads to smaller apoptotic events in comparison to EpoB.
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Affiliation(s)
- Aneta Rogalska
- Department of Thermobiology, Institute of Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, Pomorska 141/143, 90-236 Lodz, Poland.
| | - Agnieszka Marczak
- Department of Thermobiology, Institute of Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, Pomorska 141/143, 90-236 Lodz, Poland
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16
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Bolkun L, Lemancewicz D, Jablonska E, Szumowska A, Bolkun-Skornicka U, Ratajczak-Wrona W, Dzieciol J, Kloczko J. The impact of TNF superfamily molecules on overall survival in acute myeloid leukaemia: correlation with biological and clinical features. Ann Hematol 2014; 94:35-43. [PMID: 25085377 PMCID: PMC4281378 DOI: 10.1007/s00277-014-2178-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Accepted: 07/26/2014] [Indexed: 12/24/2022]
Abstract
B cell-activating factor (BAFF), a proliferation-inducing ligand (APRIL) and apoptosis-inducing ligand (TRAIL) were demonstrated in several haematological diseases including acute myeloid leukemia (AML). Those cytokines are capable of activating a broad spectrum of intracellular signalling cascades that can either induce apoptosis or protect from programmed cell death. We have analysed BAFF, APRIL and TRAIL serum concentrations in 76 patients with newly diagnosed AML and 40 healthy volunteers. The values were significantly higher for APRIL and BAFF but lower for TRAIL compared to healthy volunteers. Induction therapy significantly reduced the values for BAFF and increased them for TRAIL. Moreover, the concentration of BAFF and APRIL was significantly lower and the concentration of TRAIL higher in a group of patients with complete remission compared to non-respondent AML patients. In addition, higher concentrations of BAFF and lower of TRAIL predicted a shorter overall survival, suggesting thereby an important prognostic marker and possible therapeutic target in AML.
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Affiliation(s)
- L Bolkun
- Department of Haematology, Medical University of Bialystok, 24a Sklodowskiej-Curie, Bialystok, 15-276, Poland,
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17
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Rogalska A, Gajek A, Marczak A. Epothilone B induces extrinsic pathway of apoptosis in human SKOV-3 ovarian cancer cells. Toxicol In Vitro 2014; 28:675-83. [DOI: 10.1016/j.tiv.2014.02.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Revised: 02/10/2014] [Accepted: 02/17/2014] [Indexed: 12/24/2022]
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18
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Chromatin-associated CSF-1R binds to the promoter of proliferation-related genes in breast cancer cells. Oncogene 2013; 33:4359-64. [PMID: 24362524 PMCID: PMC4141303 DOI: 10.1038/onc.2013.542] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2013] [Revised: 10/04/2013] [Accepted: 11/04/2013] [Indexed: 12/18/2022]
Abstract
The colony-stimulating factor-1 (CSF-1) and its receptor CSF-1R physiologically regulate the monocyte/macrophage system, trophoblast implantation and breast development. An abnormal CSF-1R expression has been documented in several human epithelial tumors, including breast carcinomas. We recently demonstrated that CSF-1/CSF-1R signaling drives proliferation of breast cancer cells via ‘classical' receptor tyrosine kinase signaling, including activation of the extracellular signal-regulated kinase 1/2. In this paper, we show that CSF-1R can also localize within the nucleus of breast cancer cells, either cell lines or tissue specimens, irrespectively of their intrinsic molecular subtype. We found that the majority of nuclear CSF-1R is located in the chromatin-bound subcellular compartment. Chromatin immunoprecipitation revealed that CSF-1R, once in the nucleus, binds to the promoters of the proliferation-related genes CCND1, c-JUN and c-MYC. CSF-1R also binds the promoter of its ligand CSF-1 and positively regulates CSF-1 expression. The existence of such a receptor/ligand regulatory loop is a novel aspect of CSF-1R signaling. Moreover, our results provided the first evidence of a novel localization site of CSF-1R in breast cancer cells, suggesting that CSF-1R could act as a transcriptional regulator on proliferation-related genes.
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