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Liu L, Xiao B, Hirukawa A, Smith HW, Zuo D, Sanguin-Gendreau V, McCaffrey L, Nam AJ, Muller WJ. Ezh2 promotes mammary tumor initiation through epigenetic regulation of the Wnt and mTORC1 signaling pathways. Proc Natl Acad Sci U S A 2023; 120:e2303010120. [PMID: 37549258 PMCID: PMC10438390 DOI: 10.1073/pnas.2303010120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Accepted: 06/22/2023] [Indexed: 08/09/2023] Open
Abstract
The regulation of gene expression through histone posttranslational modifications plays a crucial role in breast cancer progression. However, the molecular mechanisms underlying the contribution of histone modification to tumor initiation remain unclear. To gain a deeper understanding of the role of the histone modifier Enhancer of Zeste homology 2 (Ezh2) in the early stages of mammary tumor progression, we employed an inducible mammary organoid system bearing conditional Ezh2 alleles that faithfully recapitulates key events of luminal B breast cancer initiation. We showed that the loss of Ezh2 severely impairs oncogene-induced organoid growth, with Ezh2-deficient organoids maintaining a polarized epithelial phenotype. Transcriptomic profiling showed that Ezh2-deficient mammary epithelial cells up-regulated the expression of negative regulators of Wnt signaling and down-regulated genes involved in mTORC1 (mechanistic target of rapamycin complex 1) signaling. We identified Sfrp1, a Wnt signaling suppressor, as an Ezh2 target gene that is derepressed and expressed in Ezh2-deficient epithelium. Furthermore, an analysis of breast cancer data revealed that Sfrp1 expression was associated with favorable clinical outcomes in luminal B breast cancer patients. Finally, we confirmed that targeting Ezh2 impairs mTORC1 activity through an indirect mechanism that up-regulates the expression of the tumor suppressor Pten. These findings indicate that Ezh2 integrates the mTORC1 and Wnt signaling pathways during early mammary tumor progression, arguing that inhibiting Ezh2 or therapeutically targeting Ezh2-dependent programs could be beneficial for the treatment of early-stage luminal B breast cancer.
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Affiliation(s)
- Linshan Liu
- Rosalind and Morris Goodman Cancer Research Institute, McGill University, Montreal, QCH3A 1A3, Canada
- Department of Biochemistry, McGill University, Montreal, QCH3A 1A3, Canada
| | - Bin Xiao
- Rosalind and Morris Goodman Cancer Research Institute, McGill University, Montreal, QCH3A 1A3, Canada
- Department of Biochemistry, McGill University, Montreal, QCH3A 1A3, Canada
| | - Alison Hirukawa
- Rosalind and Morris Goodman Cancer Research Institute, McGill University, Montreal, QCH3A 1A3, Canada
- Department of Biochemistry, McGill University, Montreal, QCH3A 1A3, Canada
| | - Harvey W. Smith
- Rosalind and Morris Goodman Cancer Research Institute, McGill University, Montreal, QCH3A 1A3, Canada
| | - Dongmei Zuo
- Rosalind and Morris Goodman Cancer Research Institute, McGill University, Montreal, QCH3A 1A3, Canada
- Department of Biochemistry, McGill University, Montreal, QCH3A 1A3, Canada
| | - Virginie Sanguin-Gendreau
- Rosalind and Morris Goodman Cancer Research Institute, McGill University, Montreal, QCH3A 1A3, Canada
| | - Luke McCaffrey
- Department of Biochemistry, McGill University, Montreal, QCH3A 1A3, Canada
- Department of Medicine, McGill University, Montreal, QCH3A 1A3, Canada
- Department of Oncology, McGill University, Montreal, QCH3A0G4, Canada
| | - Alice Jisoo Nam
- Rosalind and Morris Goodman Cancer Research Institute, McGill University, Montreal, QCH3A 1A3, Canada
- Department of Biochemistry, McGill University, Montreal, QCH3A 1A3, Canada
| | - William J. Muller
- Rosalind and Morris Goodman Cancer Research Institute, McGill University, Montreal, QCH3A 1A3, Canada
- Department of Biochemistry, McGill University, Montreal, QCH3A 1A3, Canada
- Department of Medicine, McGill University, Montreal, QCH3A 1A3, Canada
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Glennon KI, Maralani M, Abdian N, Paccard A, Montermini L, Nam AJ, Arseneault M, Staffa A, Jandaghi P, Meehan B, Brimo F, Tanguay S, Rak J, Riazalhosseini Y. Rational Development of Liquid Biopsy Analysis in Renal Cell Carcinoma. Cancers (Basel) 2021; 13:cancers13225825. [PMID: 34830979 PMCID: PMC8616270 DOI: 10.3390/cancers13225825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Accepted: 11/15/2021] [Indexed: 11/16/2022] Open
Abstract
Simple Summary Among patients affected by renal cell carcinoma (RCC), the most common type of kidney cancer, it remains difficult to identify those who are at high risk for relapse or metastasis. This is in part due to the absence of reliable clinical biomarkers and robust methods to capture them. The aim of our study was to develop an improved assay to capture prognostic genomic biomarkers in circulating tumor DNA (ctDNA) in RCC. For this purpose, we first established a next generation sequencing (NGS) assay, targeting genes that are tailored for RCC and that are largely excluded from commercially available assays. Next, we showed the reliable performance of this assay to detect prognostic gene mutations in tumor DNA isolated from plasma, and from extracellular vesicles. Thus, our study provides a resource to facilitate ctDNA analysis for precision medicine in RCC. Abstract Renal cell carcinoma (RCC) is known for its variable clinical behavior and outcome, including heterogeneity in developing relapse or metastasis. Recent data highlighted the potential of somatic mutations as promising biomarkers for risk stratification in RCC. Likewise, the analysis of circulating tumor DNA (ctDNA) for such informative somatic mutations (liquid biopsy) is considered an important advance for precision oncology in RCC, allowing to monitor molecular disease evolution in real time. However, our knowledge about the utility of ctDNA analysis in RCC is limited, in part due to the lack of RCC-appropriate assays for ctDNA analysis. Here, by interrogating different blood compartments in xenograft models, we identified plasma cell-free (cf) DNA and extracellular vesicles (ev) DNA enriched for RCC-associated ctDNA. Additionally, we developed sensitive targeted sequencing and bioinformatics workflows capable of detecting somatic mutations in RCC-relevant genes with allele frequencies ≥ 0.5%. Applying this assay to patient-matched tumor and liquid biopsies, we captured tumor mutations in cf- and ev-DNA fractions isolated from the blood, highlighting the potentials of both fractions for ctDNA analysis. Overall, our study presents an RCC-appropriate sequencing assay and workflow for ctDNA analysis and provides a proof of principle as to the feasibility of detecting tumor-specific mutations in liquid biopsy in RCC patients.
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Affiliation(s)
- Kate I. Glennon
- McGill Genome Centre, McGill University, 740 Doctor Penfield Avenue, Montreal, QC H3A 0G1, Canada; (K.I.G.); (M.M.); (A.P.); (A.J.N.); (M.A.); (A.S.); (P.J.)
- Department of Human Genetics, McGill University, 1205 Doctor Penfield Avenue, Montreal, QC H3A 1B1, Canada
| | - Mahafarin Maralani
- McGill Genome Centre, McGill University, 740 Doctor Penfield Avenue, Montreal, QC H3A 0G1, Canada; (K.I.G.); (M.M.); (A.P.); (A.J.N.); (M.A.); (A.S.); (P.J.)
- Department of Human Genetics, McGill University, 1205 Doctor Penfield Avenue, Montreal, QC H3A 1B1, Canada
- The Research Institute of the McGill University Health Centre, Montreal, QC H4A 3J1, Canada; (N.A.); (L.M.); (B.M.); (J.R.)
| | - Narges Abdian
- The Research Institute of the McGill University Health Centre, Montreal, QC H4A 3J1, Canada; (N.A.); (L.M.); (B.M.); (J.R.)
| | - Antoine Paccard
- McGill Genome Centre, McGill University, 740 Doctor Penfield Avenue, Montreal, QC H3A 0G1, Canada; (K.I.G.); (M.M.); (A.P.); (A.J.N.); (M.A.); (A.S.); (P.J.)
| | - Laura Montermini
- The Research Institute of the McGill University Health Centre, Montreal, QC H4A 3J1, Canada; (N.A.); (L.M.); (B.M.); (J.R.)
| | - Alice Jisoo Nam
- McGill Genome Centre, McGill University, 740 Doctor Penfield Avenue, Montreal, QC H3A 0G1, Canada; (K.I.G.); (M.M.); (A.P.); (A.J.N.); (M.A.); (A.S.); (P.J.)
| | - Madeleine Arseneault
- McGill Genome Centre, McGill University, 740 Doctor Penfield Avenue, Montreal, QC H3A 0G1, Canada; (K.I.G.); (M.M.); (A.P.); (A.J.N.); (M.A.); (A.S.); (P.J.)
| | - Alfredo Staffa
- McGill Genome Centre, McGill University, 740 Doctor Penfield Avenue, Montreal, QC H3A 0G1, Canada; (K.I.G.); (M.M.); (A.P.); (A.J.N.); (M.A.); (A.S.); (P.J.)
| | - Pouria Jandaghi
- McGill Genome Centre, McGill University, 740 Doctor Penfield Avenue, Montreal, QC H3A 0G1, Canada; (K.I.G.); (M.M.); (A.P.); (A.J.N.); (M.A.); (A.S.); (P.J.)
- Department of Human Genetics, McGill University, 1205 Doctor Penfield Avenue, Montreal, QC H3A 1B1, Canada
| | - Brian Meehan
- The Research Institute of the McGill University Health Centre, Montreal, QC H4A 3J1, Canada; (N.A.); (L.M.); (B.M.); (J.R.)
| | - Fadi Brimo
- Department of Pathology, McGill University, Montreal, QC H3A 2B4, Canada;
| | - Simon Tanguay
- Division of Urology, McGill University, Montreal, QC H4A 3J1, Canada;
| | - Janusz Rak
- The Research Institute of the McGill University Health Centre, Montreal, QC H4A 3J1, Canada; (N.A.); (L.M.); (B.M.); (J.R.)
| | - Yasser Riazalhosseini
- McGill Genome Centre, McGill University, 740 Doctor Penfield Avenue, Montreal, QC H3A 0G1, Canada; (K.I.G.); (M.M.); (A.P.); (A.J.N.); (M.A.); (A.S.); (P.J.)
- Department of Human Genetics, McGill University, 1205 Doctor Penfield Avenue, Montreal, QC H3A 1B1, Canada
- Correspondence:
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Diaconu SC, McNichols CHL, Ngaage LM, Liang Y, Ikheloa E, Bai J, Grant MP, Nam AJ, Rasko YM. Closed-incision negative-pressure therapy decreases complications in ventral hernia repair with concurrent panniculectomy. Hernia 2018; 24:49-55. [PMID: 30560390 DOI: 10.1007/s10029-018-1865-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2018] [Accepted: 11/25/2018] [Indexed: 01/25/2023]
Abstract
PURPOSE Ventral hernia repair with concurrent panniculectomy (VHR-PAN) is associated with high wound complication rates despite reported increased patient satisfaction. Some surgeons believe negative-pressure therapy after primary closure of the surgical incision (ciNPT) may lower wound complications in high-risk abdominal wounds. This study aims to evaluate if ciNPT improves outcomes in patients undergoing VHR-PAN. METHODS An 8-year retrospective cohort study was performed on patients who underwent VHR-PAN. Patients were divided into two groups: those who received closed-incision negative-pressure therapy ("ciNPT") and those who received standard sterile dressings ("SSD"). The primary outcome of interest was the rate of postoperative complications between these groups. Complications were subdivided into surgical site occurrences (which included surgical site occurrences that required an intervention), return to the operating room, and hernia recurrence. RESULTS A total of 104 patients were analyzed: 62 in the ciNPT group and 42 in the SSD group. Median follow-up duration was similar between both groups (182 days vs 195 days, p = 0.624). Patients in the ciNPT group had fewer total complications (57% vs. 83%, p = 0.004) and fewer SSO (47% vs. 69%, p = 0.025). However, no differences were noted when comparing individual complications (SSI, wound dehiscence, skin necrosis, chronic wound, seroma, and hematoma). There was no difference in return to the operating room (27% vs. 26%, p = 0.890) or hernia recurrence (21% vs 19%, p = 0.811). Multivariate analysis showed that ciNPT decreased the risk of SSOPI nearly fourfold (odds ratio 0.28, 95% CI = 0.09-0.87, p = 0.027). CONCLUSIONS This study showed that closed-incision negative-pressure therapy in ventral hernia repair with concurrent panniculectomy may decrease the rate of wound complications in this high-risk population.
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Affiliation(s)
- S C Diaconu
- Division of Plastic, Reconstructive, and Maxillofacial Surgery, R Adams Cowley Shock Trauma Center, 110 S. Paca St., 21201, Baltimore, MD, USA
| | - C H L McNichols
- Division of Plastic and Reconstructive Surgery, University of Maryland Medical Center, 22 South Greene St., S8D18, 21201, Baltimore, MD, USA
| | - L M Ngaage
- Division of Plastic and Reconstructive Surgery, University of Maryland Medical Center, 22 South Greene St., S8D18, 21201, Baltimore, MD, USA
| | - Y Liang
- Division of Plastic and Reconstructive Surgery, University of Maryland Medical Center, 22 South Greene St., S8D18, 21201, Baltimore, MD, USA
| | - E Ikheloa
- Division of Plastic and Reconstructive Surgery, University of Maryland Medical Center, 22 South Greene St., S8D18, 21201, Baltimore, MD, USA
| | - J Bai
- Division of Plastic and Reconstructive Surgery, University of Maryland Medical Center, 22 South Greene St., S8D18, 21201, Baltimore, MD, USA
| | - M P Grant
- Division of Plastic, Reconstructive, and Maxillofacial Surgery, R Adams Cowley Shock Trauma Center, 110 S. Paca St., 21201, Baltimore, MD, USA
| | - A J Nam
- Division of Plastic, Reconstructive, and Maxillofacial Surgery, R Adams Cowley Shock Trauma Center, 110 S. Paca St., 21201, Baltimore, MD, USA
| | - Y M Rasko
- Division of Plastic and Reconstructive Surgery, University of Maryland Medical Center, 22 South Greene St., S8D18, 21201, Baltimore, MD, USA.
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Barth RN, Rodriguez ED, Mundinger GS, Nam AJ, Ha JS, Hui-Chou H, Jones LS, Panda A, Shipley ST, Drachenberg CB, Kukuruga D, Bartlett ST. Vascularized bone marrow-based immunosuppression inhibits rejection of vascularized composite allografts in nonhuman primates. Am J Transplant 2011; 11:1407-16. [PMID: 21668624 DOI: 10.1111/j.1600-6143.2011.03551.x] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Vascularized composite allograft (VCA) transplantation (also referred to as composite tissue allotransplantation) has demonstrated clinical success in cases of hand, arm and face transplantation despite prior belief that skin provides an insurmountable barrier to allograft rejection. These overall good outcomes are facilitated by substantial immunosuppressive requirements in otherwise healthy patients, yet still demonstrate frequent rejection episodes. We developed a nonhuman primate model of facial segment allotransplantation to elucidate the unique pathophysiology and immunosuppressive requirements of VCA with addition of concomitant vascularized bone marrow (VBM). Heterotopically transplanted facial segment VCA with VBM treated only with tacrolimus and mycophenolate mofetil (MMF) demonstrated prolonged rejection-free survival, compared to VCA without VBM that demonstrated early rejection episodes and graft loss. While VCA with VBM demonstrated sporadic macrochimerism, acute and chronic rejection and graft loss occurred after discontinuation of immunosuppression. These data support an immunomodulatory role of VBM in VCA that reduces immunosuppressive requirements while providing improved outcomes.
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Affiliation(s)
- R N Barth
- Division of Transplantation, Program for Comparative Medicine Department of Pathology Immunogenetics Laboratory, University of Maryland School of Medicine, Baltimore, MD, USA.
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Mundinger GS, Hui-Chou HG, Nam AJ, Dorafshar AH, Sulek JE, Drachenberg CB, Kukuruga DL, Shipley ST, Jones LS, Bartlett ST, Barth RN, Rodriguez ED. 173B: COMBINED ANTI-CD28 COSTIMULATORY BLOCKADE AND LOW-DOSE TACROLIMUS THERAPY IN A NON-HUMAN PRIMATE VASCULARIZED FIBULA ALLOGRAFT MODEL. Plast Reconstr Surg 2010. [DOI: 10.1097/01.prs.0000371907.63605.06] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Nam AJ, Brower RG, Fessler HE, Simon BA. Biologic variability in mechanical ventilation rate and tidal volume does not improve oxygenation or lung mechanics in canine oleic acid lung injury. Am J Respir Crit Care Med 2000; 161:1797-804. [PMID: 10852747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023] Open
Abstract
Mechanical ventilation in patients with acute respiratory distress syndrome and acute lung injury (ALI) remains a difficult challenge because of the conflict between maintaining adequate gas exchange and furthering lung injury via overdistention. In a recent study, Lefevre and colleagues (Am. J. Respir. Crit. Care Med. 1996;154: 1567-1572) suggested that mechanical ventilation with natural biologic variability (BV) in breath-to-breath respiratory frequency (f) and VT could reduce lung injury and improve gas exchange without increases in mean airway pressure (Paw) or peak inspiratory pressure (PIP). However, significant differences in cardiac output (CO), Pa(CO(2)), pH, and delivered VT between the treatment groups in their study could have influenced these results. Because of the potential implications of these findings for patient care, we attempted to confirm these findings by Lefevre and colleagues in a canine model of oleic acid-induced lung injury. Eighteen mongrel dogs were anesthetized in the supine position, paralyzed, and mechanically ventilated with 50% O(2) at f = 15 breaths/min, and VT was adjusted to achieve an end-tidal CO(2) of 30 to 35 mm Hg. Lung injury was produced by infusion of 0.06 ml/kg oleic acid solution into the right atrium over a 30-min period. Animals were then randomized to either conventional ventilation at the baseline settings (n = 9) or to BV at the same mean VT and f (n = 9). Both groups received comparable degrees of injury, and hemodynamic and ventilatory parameters were closely matched, with no differences in mean VT, PIP, mean Paw, Pa(CO(2)), pH, CO, pulmonary artery occlusion pressure, or arterial pressure (Pa). However, no differences between the two groups were found in Pa(O(2)), shunt, or static compliance over a 4-h period. When hemodynamic and ventilatory parameters were well matched in a canine model of ALI, BV showed no advantage over conventional ventilation at constant VT and f.
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Affiliation(s)
- A J Nam
- Department of Environmental Physiology, Johns Hopkins Medical Institutions, Baltimore, Maryland, USA
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