1
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Morse KW, Sun J, Hu L, Bok S, Debnath S, Cung M, Yallowitz AR, Meyers KN, Iyer S, Greenblatt MB. Development of Murine Anterior Interbody and Posterolateral Spinal Fusion Techniques. J Bone Joint Surg Am 2024; 106:735-745. [PMID: 38194481 DOI: 10.2106/jbjs.23.00690] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/11/2024]
Abstract
BACKGROUND Multiple animal models have previously been utilized to investigate anterior fusion techniques, but a mouse model has yet to be developed. The purpose of this study was to develop murine anterior interbody and posterolateral fusion techniques. METHODS Mice underwent either anterior interbody or posterolateral spinal fusion. A protocol was developed for both procedures, including a description of the relevant anatomy. Samples were subjected to micro-computed tomography to assess fusion success and underwent biomechanical testing with use of 4-point bending. Lastly, samples were fixed and embedded for histologic evaluation. RESULTS Surgical techniques for anterior interbody and posterolateral fusion were developed. The fusion rate was 83.3% in the anterior interbody model and 100% in the posterolateral model. Compared with a control, the posterolateral model exhibited a greater elastic modulus. Histologic analysis demonstrated endochondral ossification between bridging segments, further confirming the fusion efficacy in both models. CONCLUSIONS The murine anterior interbody and posterolateral fusion models are efficacious and provide an ideal platform for studying the molecular and cellular mechanisms mediating spinal fusion. CLINICAL RELEVANCE Given the extensive genetic tools available in murine disease models, use of fusion models such as ours can enable determination of the underlying genetic pathways involved in spinal fusion.
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Affiliation(s)
- Kyle W Morse
- Department of Spine Surgery, Hospital for Special Surgery, New York, NY
| | - Jun Sun
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY
| | - Lingling Hu
- Department of Spine Surgery, Hospital for Special Surgery, New York, NY
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY
- Research Division, Hospital for Special Surgery, New York, NY
| | - Seoyeon Bok
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY
| | - Shawon Debnath
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY
| | - Michelle Cung
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY
| | - Alisha R Yallowitz
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY
| | - Kathleen N Meyers
- Department of Biomechanics, Hospital for Special Surgery, New York, NY
| | - Sravisht Iyer
- Department of Spine Surgery, Hospital for Special Surgery, New York, NY
| | - Matthew B Greenblatt
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY
- Research Division, Hospital for Special Surgery, New York, NY
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2
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Bok S, Yallowitz AR, Sun J, McCormick J, Cung M, Hu L, Lalani S, Li Z, Sosa BR, Baumgartner T, Byrne P, Zhang T, Morse KW, Mohamed FF, Ge C, Franceschi RT, Cowling RT, Greenberg BH, Pisapia DJ, Imahiyerobo TA, Lakhani S, Ross ME, Hoffman CE, Debnath S, Greenblatt MB. A multi-stem cell basis for craniosynostosis and calvarial mineralization. Nature 2023; 621:804-812. [PMID: 37730988 PMCID: PMC10799660 DOI: 10.1038/s41586-023-06526-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [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: 11/08/2021] [Accepted: 08/09/2023] [Indexed: 09/22/2023]
Abstract
Craniosynostosis is a group of disorders of premature calvarial suture fusion. The identity of the calvarial stem cells (CSCs) that produce fusion-driving osteoblasts in craniosynostosis remains poorly understood. Here we show that both physiologic calvarial mineralization and pathologic calvarial fusion in craniosynostosis reflect the interaction of two separate stem cell lineages; a previously identified cathepsin K (CTSK) lineage CSC1 (CTSK+ CSC) and a separate discoidin domain-containing receptor 2 (DDR2) lineage stem cell (DDR2+ CSC) that we identified in this study. Deletion of Twist1, a gene associated with craniosynostosis in humans2,3, solely in CTSK+ CSCs is sufficient to drive craniosynostosis in mice, but the sites that are destined to fuse exhibit an unexpected depletion of CTSK+ CSCs and a corresponding expansion of DDR2+ CSCs, with DDR2+ CSC expansion being a direct maladaptive response to CTSK+ CSC depletion. DDR2+ CSCs display full stemness features, and our results establish the presence of two distinct stem cell lineages in the sutures, with both populations contributing to physiologic calvarial mineralization. DDR2+ CSCs mediate a distinct form of endochondral ossification without the typical haematopoietic marrow formation. Implantation of DDR2+ CSCs into suture sites is sufficient to induce fusion, and this phenotype was prevented by co-transplantation of CTSK+ CSCs. Finally, the human counterparts of DDR2+ CSCs and CTSK+ CSCs display conserved functional properties in xenograft assays. The interaction between these two stem cell populations provides a new biologic interface for the modulation of calvarial mineralization and suture patency.
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Affiliation(s)
- Seoyeon Bok
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Alisha R Yallowitz
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Jun Sun
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Jason McCormick
- Flow Cytometry Core Facility, Weill Cornell Medicine, New York, NY, USA
| | - Michelle Cung
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Lingling Hu
- Department of Orthopedic Surgery, Hospital for Special Surgery, New York, NY, USA
| | - Sarfaraz Lalani
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Zan Li
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Branden R Sosa
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Tomas Baumgartner
- Flow Cytometry Core Facility, Weill Cornell Medicine, New York, NY, USA
| | - Paul Byrne
- Flow Cytometry Core Facility, Weill Cornell Medicine, New York, NY, USA
| | - Tuo Zhang
- Genomics Resources Core Facility, Weill Cornell Medicine, New York, NY, USA
| | - Kyle W Morse
- Department of Orthopedic Surgery, Hospital for Special Surgery, New York, NY, USA
| | - Fatma F Mohamed
- Department of Periodontics, Prevention and Geriatrics, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - Chunxi Ge
- Department of Periodontics, Prevention and Geriatrics, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - Renny T Franceschi
- Department of Periodontics, Prevention and Geriatrics, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - Randy T Cowling
- Division of Cardiovascular Medicine, Department of Medicine, University of California, San Diego, CA, USA
| | - Barry H Greenberg
- Division of Cardiovascular Medicine, Department of Medicine, University of California, San Diego, CA, USA
| | - David J Pisapia
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Thomas A Imahiyerobo
- Division of Plastic Surgery, Department of Surgery, New York-Presbyterian Hospital and Columbia University Medical Center, New York, NY, USA
| | - Shenela Lakhani
- Center for Neurogenetics, Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, New York, NY, USA
| | - M Elizabeth Ross
- Center for Neurogenetics, Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, New York, NY, USA
| | - Caitlin E Hoffman
- Department of Neurological Surgery, Weill Cornell Medicine and New York-Presbyterian Hospital, New York, NY, USA
| | - Shawon Debnath
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA.
| | - Matthew B Greenblatt
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA.
- Research Division, Hospital for Special Surgery, New York, NY, USA.
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3
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Sun J, Hu L, Bok S, Yallowitz AR, Cung M, McCormick J, Zheng LJ, Debnath S, Niu Y, Tan AY, Lalani S, Morse KW, Shinn D, Pajak A, Hammad M, Suhardi VJ, Li Z, Li N, Wang L, Zou W, Mittal V, Bostrom MPG, Xu R, Iyer S, Greenblatt MB. A vertebral skeletal stem cell lineage driving metastasis. Nature 2023; 621:602-609. [PMID: 37704733 PMCID: PMC10829697 DOI: 10.1038/s41586-023-06519-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [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: 09/26/2022] [Accepted: 08/04/2023] [Indexed: 09/15/2023]
Abstract
Vertebral bone is subject to a distinct set of disease processes from long bones, including a much higher rate of solid tumour metastases1-4. The basis for this distinct biology of vertebral bone has so far remained unknown. Here we identify a vertebral skeletal stem cell (vSSC) that co-expresses ZIC1 and PAX1 together with additional cell surface markers. vSSCs display formal evidence of stemness, including self-renewal, label retention and sitting at the apex of their differentiation hierarchy. vSSCs are physiologic mediators of vertebral bone formation, as genetic blockade of the ability of vSSCs to generate osteoblasts results in defects in the vertebral neural arch and body. Human counterparts of vSSCs can be identified in vertebral endplate specimens and display a conserved differentiation hierarchy and stemness features. Multiple lines of evidence indicate that vSSCs contribute to the high rates of vertebral metastatic tropism observed in breast cancer, owing in part to increased secretion of the novel metastatic trophic factor MFGE8. Together, our results indicate that vSSCs are distinct from other skeletal stem cells and mediate the unique physiology and pathology of vertebrae, including contributing to the high rate of vertebral metastasis.
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Affiliation(s)
- Jun Sun
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Lingling Hu
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
- Department of Spine Surgery, Hospital for Special Surgery, New York, NY, USA
| | - Seoyeon Bok
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Alisha R Yallowitz
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Michelle Cung
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Jason McCormick
- Flow Cytometry Core Facility, Weill Cornell Medicine, New York, NY, USA
| | - Ling J Zheng
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Shawon Debnath
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Yuzhe Niu
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Adrian Y Tan
- Genomics Resources Core Facility, Weill Cornell Medicine, New York, NY, USA
| | - Sarfaraz Lalani
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Kyle W Morse
- Department of Spine Surgery, Hospital for Special Surgery, New York, NY, USA
| | - Daniel Shinn
- Department of Spine Surgery, Hospital for Special Surgery, New York, NY, USA
- Weill Cornell Medical College, New York, NY, USA
| | - Anthony Pajak
- Department of Spine Surgery, Hospital for Special Surgery, New York, NY, USA
| | - Mohammed Hammad
- Research Division, Hospital for Special Surgery, New York, NY, USA
| | - Vincentius Jeremy Suhardi
- Research Division, Hospital for Special Surgery, New York, NY, USA
- Department of Orthopedic Surgery, Hospital for Special Surgery, New York, NY, USA
| | - Zan Li
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Na Li
- State Key Laboratory of Cellular Stress Biology, School of Medicine, Xiamen University, Xiamen, China
| | - Lijun Wang
- Institute of Microsurgery on Extremities, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China
| | - Weiguo Zou
- Institute of Microsurgery on Extremities, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China
- State Key Laboratory of Cell Biology, Shanghai Institute of Biochemistry and Cell Biology, Center for Excellence in Molecular Cell Science, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai, China
| | - Vivek Mittal
- Department of Cardiothoracic Surgery, Weill Cornell Medicine, New York, NY, USA
| | - Mathias P G Bostrom
- Research Division, Hospital for Special Surgery, New York, NY, USA
- Department of Orthopedic Surgery, Hospital for Special Surgery, New York, NY, USA
- Department of Orthopedic Surgery, Weill Cornell Medicine, New York, NY, USA
| | - Ren Xu
- State Key Laboratory of Cellular Stress Biology, School of Medicine, Xiamen University, Xiamen, China
| | - Sravisht Iyer
- Department of Spine Surgery, Hospital for Special Surgery, New York, NY, USA
| | - Matthew B Greenblatt
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA.
- Research Division, Hospital for Special Surgery, New York, NY, USA.
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4
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Yallowitz AR, Shim JH, Xu R, Greenblatt M. An angiogenic approach to osteoanabolic therapy targeting the SHN3-SLIT3 pathway. Bone 2023; 172:116761. [PMID: 37030497 DOI: 10.1016/j.bone.2023.116761] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 03/30/2023] [Accepted: 04/05/2023] [Indexed: 04/10/2023]
Abstract
Often, disorders of impaired bone formation involve not only a cell intrinsic defect in the ability of osteoblasts to form bone, but moreover a broader dysfunction of the skeletal microenvironment that limits osteoblast activity. Developing approaches to osteoanabolic therapy that not only augment osteoblast activity but moreover correct this microenvironmental dysfunction may enable both more effective osteoanabolic therapies and also addressing a broader set of indications where vasculopathy or other forms microenvironment dysfunction feature prominently. We here review evidence that SHN3 acts as a suppressor of not only the cell intrinsic bone formation activity of osteoblasts, but moreover of the creation of a local osteoanabolic microenvironment. Mice lacking Schnurri3 (SHN3, HIVEP3) display a very robust increase in bone formation, that is due to de-repression of ERK pathway signaling in osteoblasts. In addition to loss of SHN3 augmenting the differentiation and bone formation activity of osteoblasts, loss of SHN3 increases secretion of SLIT3 by osteoblasts, which in a skeletal context acts as an angiogenic factor. Through this angiogenic activity, SLIT3 creates an osteoanabolic microenvironment, and accordingly treatment with SLIT3 can increase bone formation and enhance fracture healing. These features both validate vascular endothelial cells as a therapeutic target for disorders of low bone mass alongside the traditionally targeted osteoblasts and osteoclasts and indicate that targeting the SHN3/SLIT3 pathway provides a new mechanism to induce therapeutic osteoanabolic responses.
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Affiliation(s)
- Alisha R Yallowitz
- Department of Pathology and Laboratory Medicine, Weill Cornell Medical College, New York, NY 10065, United States of America
| | - Jae-Hyuck Shim
- Department of Medicine, Division of Rheumatology, University of Massachusetts Chan Medical School, USA; Horae Gene Therapy Center, University of Massachusetts Chan Medical School, Li Weibo Institute for Rare Diseases Research, University of Massachusetts Chan Medical School, Worcester, MA 01605, USA
| | - Ren Xu
- The First Affiliated Hospital of Xiamen University-ICMRS Collaborating Center for Skeletal Stem Cells, State Key Laboratory of Cellular Stress Biology, Faculty of Medicine and Life Sciences, Xiamen University, Xiamen 361005, China; Fujian Provincial Key Laboratory of Organ and Tissue Regeneration, School of Medicine, Xiamen University, Xiamen 361102, China
| | - Matthew Greenblatt
- Department of Pathology and Laboratory Medicine, Weill Cornell Medical College, New York, NY 10065, United States of America; Research Division, Hospital for Special Surgery, New York, NY 10065, United States of America.
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5
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Li MH, Kuetemeyer JM, Yallowitz AR, Wellik DM. Characterization of a novel Hoxa5eGFP mouse line. Dev Dyn 2023; 252:536-546. [PMID: 36577717 PMCID: PMC10066829 DOI: 10.1002/dvdy.563] [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: 11/02/2022] [Revised: 12/16/2022] [Accepted: 12/17/2022] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND Hox genes encode transcription factors that are important for establishing the body plan. Hoxa5 is a member of the mammalian Hox5 paralogous group that regulates the patterning and morphology of the cervical-thoracic region of the axial skeleton. Hoxa5 also plays crucial functions in lung morphogenesis. RESULTS We generated a Hoxa5eGFP reporter mouse line using CRISPR technology, allowing real-time visualization of Hoxa5 expression. Hoxa5eGFP recapitulates reported embryonic Hoxa5 mRNA expression patterns. Specifically, Hoxa5eGFP can be visualized in the developing mouse neural tube, somites, lung, diaphragm, foregut, and midgut, among other organs. In the stomach, posteriorly biased Hoxa5eGFP expression correlates with a drastic morphological reduction of the corpus in Hox5 paralogous mutants. Expression of Hoxa5eGFP in the lung continues in all lung fibroblast populations through postnatal and adult stages. CONCLUSIONS We identified cell types that express Hoxa5 in postnatal and adult mouse lungs, including various fibroblasts and vascular endothelial cells. This reporter line will be a powerful tool for studies of the function of Hoxa5 during mouse development, homeostasis, and disease processes.
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Affiliation(s)
- Mu-Hang Li
- Genetics Training Program, University of Wisconsin-Madison, Madison, WI, United States
- Department of Cell and Regenerative Biology, University of Wisconsin-Madison, School of Medicine and Public Health, Madison, WI, United States
| | - Julia M. Kuetemeyer
- Department of Cell and Regenerative Biology, University of Wisconsin-Madison, School of Medicine and Public Health, Madison, WI, United States
| | - Alisha R. Yallowitz
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, United States
| | - Deneen M. Wellik
- Department of Cell and Regenerative Biology, University of Wisconsin-Madison, School of Medicine and Public Health, Madison, WI, United States
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6
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Sun J, Hu L, Bok S, Yallowitz AR, Cung M, McCormick J, Zheng LJ, Debnath S, Niu Y, Tan AY, Lalani S, Morse KW, Shinn D, Pajak A, Li Z, Li N, Xu R, Iyer S, Greenblatt MB. Discovery of a Vertebral Skeletal Stem Cell Driving Spinal Metastases. Res Sq 2023:rs.3.rs-2106142. [PMID: 36747772 PMCID: PMC9901027 DOI: 10.21203/rs.3.rs-2106142/v1] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Vertebral bone is subject to a distinct set of disease processes from those of long bones, notably including a much higher rate of solid tumor metastases that cannot be explained by passive blood flow distribution alone. The basis for this distinct biology of vertebral bone has remained elusive. Here we identify a vertebral skeletal stem cell (vSSC), co-expressing the transcription factors ZIC1 and PAX1 together with additional cell surface markers, whose expression profile and function are markedly distinct from those of long bone skeletal stem cells (lbSSCs). vSSCs display formal evidence of stemness, including self-renewal, label retention and sitting at the apex of their differentiation hierarchy. Lineage tracing of vSSCs confirms that they make a persistent contribution to multiple mature cell lineages in the native vertebrae. vSSCs are physiologic mediators of spine mineralization, as genetic blockade of the ability of vSSCs to generate osteoblasts results in defects in the vertebral neural arch and body. Human counterparts of vSSCs can be identified in vertebral endplate specimens and display a conserved differentiation hierarchy and stemness. Multiple lines of evidence indicate that vSSCs contribute to the high rates of vertebral metastatic tropism observed clinically in breast cancer. Specifically, when an organoid system is used to place both vSSCs and lbSSCs in an identical anatomic context, vSSC-lineage cells are more efficient than lbSSC-lineage cells at recruiting metastases, a phenotype that is due in part to increased secretion of the novel metastatic trophic factor MFGE8. Similarly, genetically targeting loss-of-function to the vSSC lineage results in reduced metastasis rates in the native vertebral environment. Taken together, vSSCs are distinct from other skeletal stem cells and mediate the unique physiology and pathology of vertebrae, including contributing to the high rate of metastatic seeding of the vertebrae.
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Affiliation(s)
- Jun Sun
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Lingling Hu
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
- Department of Spine Surgery, Hospital for Special Surgery, New York, NY, USA
| | - Seoyeon Bok
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Alisha R Yallowitz
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Michelle Cung
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Jason McCormick
- Flow Cytometry Core Facility, Weill Cornell Medicine, New York, NY, USA
| | - Ling J Zheng
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Shawon Debnath
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Yuzhe Niu
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Adrian Y Tan
- Genomics Resources Core Facility, Weill Cornell Medicine, New York, NY, USA
| | - Sarfaraz Lalani
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Kyle W Morse
- Department of Spine Surgery, Hospital for Special Surgery, New York, NY, USA
| | - Daniel Shinn
- Department of Spine Surgery, Hospital for Special Surgery, New York, NY, USA
- Weill Cornell Medical College, 1300 York Avenue, New York, NY 10065, USA
| | - Anthony Pajak
- Department of Spine Surgery, Hospital for Special Surgery, New York, NY, USA
| | - Zan Li
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Na Li
- State Key Laboratory of Cellular Stress Biology, School of Medicine, Xiamen University, Xiamen, Fujian, China
| | - Ren Xu
- State Key Laboratory of Cellular Stress Biology, School of Medicine, Xiamen University, Xiamen, Fujian, China
| | - Sravisht Iyer
- Department of Spine Surgery, Hospital for Special Surgery, New York, NY, USA
| | - Matthew B Greenblatt
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
- Research Division, Hospital for Special Surgery, New York, NY, USA
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7
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Sun J, Feng H, Xing W, Han Y, Suo J, Yallowitz AR, Qian N, Shi Y, Greenblatt MB, Zou W. Histone demethylase LSD1 is critical for endochondral ossification during bone fracture healing. Sci Adv 2020; 6:6/45/eaaz1410. [PMID: 33148658 PMCID: PMC7673679 DOI: 10.1126/sciadv.aaz1410] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/14/2019] [Accepted: 09/16/2020] [Indexed: 06/11/2023]
Abstract
Bone fracture is repaired predominantly through endochondral ossification. However, the regulation of endochondral ossification by key factors during fracture healing remains largely enigmatic. Here, we identify histone modification enzyme LSD1 as a critical factor regulating endochondral ossification during bone regeneration. Loss of LSD1 in Prx1 lineage cells severely impaired bone fracture healing. Mechanistically, LSD1 tightly controls retinoic acid signaling through regulation of Aldh1a2 expression level. The increased retinoic acid signaling in LSD1-deficient mice suppressed SOX9 expression and impeded the cartilaginous callus formation during fracture repair. The discovery that LSD1 can regulate endochondral ossification during fracture healing will benefit the understanding of bone regeneration and have implications for regenerative medicine.
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Affiliation(s)
- Jun Sun
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, 320 Yueyang Road, Shanghai 200031, China
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY 10065, USA
| | - Heng Feng
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, 320 Yueyang Road, Shanghai 200031, China
| | - Wenhui Xing
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, 320 Yueyang Road, Shanghai 200031, China
| | - Yujiao Han
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, 320 Yueyang Road, Shanghai 200031, China
| | - Jinlong Suo
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, 320 Yueyang Road, Shanghai 200031, China
| | - Alisha R Yallowitz
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY 10065, USA
| | - Niandong Qian
- Shanghai Key Laboratory for Prevention and Treatment of Bone and Joint Diseases with Integrated Chinese-Western Medicine, Shanghai Institute of Traumatology and Orthopedics, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, 197 Ruijin 2nd Road, Shanghai 200025, China
| | - Yujiang Shi
- Newborn Medicine Division, Boston Children's Hospital and Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA
| | - Matthew B Greenblatt
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY 10065, USA
| | - Weiguo Zou
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, 320 Yueyang Road, Shanghai 200031, China.
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8
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Debnath S, Yallowitz AR, McCormick J, Lalani S, Zhang T, Xu R, Li N, Liu Y, Yang YS, Eiseman M, Shim JH, Hameed M, Healey JH, Bostrom MP, Landau DA, Greenblatt MB. Discovery of a periosteal stem cell mediating intramembranous bone formation. Nature 2018; 562:133-139. [PMID: 30250253 PMCID: PMC6193396 DOI: 10.1038/s41586-018-0554-8] [Citation(s) in RCA: 349] [Impact Index Per Article: 58.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Accepted: 08/13/2018] [Indexed: 01/15/2023]
Abstract
Bone consists of separate inner endosteal and outer periosteal compartments, each with distinct contributions to bone physiology and each maintaining separate pools of cells owing to physical separation by the bone cortex. The skeletal stem cell that gives rise to endosteal osteoblasts has been extensively studied; however, the identity of periosteal stem cells remains unclear1-5. Here we identify a periosteal stem cell (PSC) that is present in the long bones and calvarium of mice, displays clonal multipotency and self-renewal, and sits at the apex of a differentiation hierarchy. Single-cell and bulk transcriptional profiling show that PSCs display transcriptional signatures that are distinct from those of other skeletal stem cells and mature mesenchymal cells. Whereas other skeletal stem cells form bone via an initial cartilage template using the endochondral pathway4, PSCs form bone via a direct intramembranous route, providing a cellular basis for the divergence between intramembranous versus endochondral developmental pathways. However, there is plasticity in this division, as PSCs acquire endochondral bone formation capacity in response to injury. Genetic blockade of the ability of PSCs to give rise to bone-forming osteoblasts results in selective impairments in cortical bone architecture and defects in fracture healing. A cell analogous to mouse PSCs is present in the human periosteum, raising the possibility that PSCs are attractive targets for drug and cellular therapy for skeletal disorders. The identification of PSCs provides evidence that bone contains multiple pools of stem cells, each with distinct physiologic functions.
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Affiliation(s)
- Shawon Debnath
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Alisha R Yallowitz
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Jason McCormick
- Flow Cytometry Core Facility, Weill Cornell Medicine, New York, NY, USA
| | - Sarfaraz Lalani
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Tuo Zhang
- Genomics Resources Core Facility, Weill Cornell Medicine, New York, NY, USA
| | - Ren Xu
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Na Li
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Yifang Liu
- Pathology and Laboratory Medicine Core Facility, Weill Cornell Medicine, New York, NY, USA
| | - Yeon Suk Yang
- Department of Medicine, University of Massachusetts Medical School, North Worcester, MA, USA
| | - Mark Eiseman
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Jae-Hyuck Shim
- Department of Medicine, University of Massachusetts Medical School, North Worcester, MA, USA
| | - Meera Hameed
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - John H Healey
- Orthopaedic Service, Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Mathias P Bostrom
- Research Division, Department of Orthopaedic Surgery, Hospital for Special Surgery, New York, NY, USA.,Division of Adult Reconstruction and Joint Replacement, Department of Orthopaedic Surgery, Hospital for Special Surgery, New York, NY, USA
| | - Dan Avi Landau
- Cancer Genomics and Evolutionary Dynamics, Weill Cornell Medicine, New York, NY, USA.,New York Genome Center, New York, NY, USA
| | - Matthew B Greenblatt
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA.
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9
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Alexandrova EM, Yallowitz AR, Li D, Xu S, Schulz R, Proia DA, Lozano G, Dobbelstein M, Moll UM. Corrigendum: Improving survival by exploiting tumour dependence on stabilized mutant p53 for treatment. Nature 2015; 527:398. [PMID: 26416737 DOI: 10.1038/nature15720] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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10
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Yallowitz AR, Hanel W, Moll UM. Expansion of the hematopoietic stem cell compartment is necessary but not sufficient for gain-of-function mutant p53 R248Q to accelerate lymphomagenesis. Cell Death Differ 2015; 22:1397. [PMID: 26045050 PMCID: PMC4495365 DOI: 10.1038/cdd.2015.63] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Affiliation(s)
- A R Yallowitz
- Department of Pathology, Stony Brook University, Stony Brook, NY, USA
| | - W Hanel
- Department of Pathology, Stony Brook University, Stony Brook, NY, USA
| | - U M Moll
- Department of Pathology, Stony Brook University, Stony Brook, NY, USA
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11
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Alexandrova EM, Yallowitz AR, Li D, Xu S, Schulz R, Proia DA, Lozano G, Dobbelstein M, Moll UM. Improving survival by exploiting tumour dependence on stabilized mutant p53 for treatment. Nature 2015; 523:352-6. [PMID: 26009011 PMCID: PMC4506213 DOI: 10.1038/nature14430] [Citation(s) in RCA: 259] [Impact Index Per Article: 28.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2014] [Accepted: 03/20/2015] [Indexed: 12/12/2022]
Abstract
Missense mutations in p53 generate aberrant proteins with abrogated tumor suppressor functions that can also acquire oncogenic gain-of-functions (GOF) that promote malignant progression, invasion, metastasis and chemoresistance1–5. Mutant p53 (mutp53) proteins undergo massive constitutive stabilization specifically in tumors, which is the key requisite for GOF6–8. Although currently 11 million patients worldwide live with tumors expressing highly stabilized mutp53, it is unknown whether mutp53 is a therapeutic target in vivo. Here we use a novel mutp53 mouse model expressing an inactivatible R248Q hotspot mutation (floxQ) to show that tumors depend on sustained mutp53 expression. Upon Tamoxifen-induced mutp53 ablation, allo-transplanted and autochthonous tumors curb their growth, thus extending animal survival by 37%, and advanced tumors undergo apoptosis and tumor regression or stagnation. The HSP90/HDAC6 chaperone machinery, which is significantly upregulated in cancer compared to normal tissues, is a major determinant of mutp53 stabilization9–12. We show that long-term HSP90 inhibition significantly extends the survival of mutp53 Q/−2 and H/H (R172H allele3) mice by 59% and 48%, respectively, but not their respective p53−/− littermates. This mutp53-dependent drug effect occurs in H/H mice treated with 17DMAG+SAHA and in H/H and Q/− mice treated with the potent Hsp90 inhibitor ganetespib. Notably, drug activity correlates with induction of mutp53 degradation, tumor apoptosis and prevention of T-lymphomagenesis. These proof-of-principle data identify mutp53 as an actionable cancer-specific drug target.
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Affiliation(s)
- E M Alexandrova
- Department of Pathology, Stony Brook University, Stony Brook, New York 11794, USA
| | - A R Yallowitz
- Department of Pathology, Stony Brook University, Stony Brook, New York 11794, USA
| | - D Li
- Department of Pathology, Stony Brook University, Stony Brook, New York 11794, USA
| | - S Xu
- Department of Pathology, Stony Brook University, Stony Brook, New York 11794, USA
| | - R Schulz
- Institute of Molecular Oncology, University of Göttingen, 37077 Göttingen, Germany
| | - D A Proia
- Synta Pharmaceuticals Corp., Lexington, Massachusetts 02421, USA
| | - G Lozano
- Department of Cancer Genetics, University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030, USA
| | - M Dobbelstein
- Institute of Molecular Oncology, University of Göttingen, 37077 Göttingen, Germany
| | - U M Moll
- 1] Department of Pathology, Stony Brook University, Stony Brook, New York 11794, USA [2] Institute of Molecular Oncology, University of Göttingen, 37077 Göttingen, Germany
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12
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Yallowitz AR, Li D, Lobko A, Mott D, Nemajerova A, Marchenko N. Mutant p53 Amplifies Epidermal Growth Factor Receptor Family Signaling to Promote Mammary Tumorigenesis. Mol Cancer Res 2015; 13:743-54. [PMID: 25573952 DOI: 10.1158/1541-7786.mcr-14-0360] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2014] [Accepted: 12/17/2014] [Indexed: 12/14/2022]
Abstract
UNLABELLED The EGFR family (ErbB2/Her2 and EGFR/ErbB1/Her1) often modulates the transcriptional program involved in promoting mammary tumorigenesis. In humans, the majority of ErbB2-positive sporadic breast cancers harbor p53 mutations, which correlate with poor prognosis. Also, the extremely high incidence of ErbB2-positive breast cancer in women with p53 germline mutations (Li-Fraumeni syndrome) suggests a key role of mutant p53 specifically in ErbB2-mediated mammary tumorigenesis. To examine the role of mutant p53 during ErbB2-mediated mammary tumorigenesis, a mutant p53 allele (R172H) was introduced into the (MMTV)-ErbB2/Neu mouse model system. Interestingly, we show in heterozygous p53 mice that mutant p53 R172H is a more potent activator of ErbB2-mediated mammary tumorigenesis than simple loss of p53. The more aggressive disease in mutant p53 animals was reflected by earlier tumor onset, increased mammary tumor multiplicity, and shorter survival. These in vivo and in vitro data provide mechanistic evidence that mutant p53 amplifies ErbB2 and EGFR signaling to promote the expansion of mammary stem cells and induce cell proliferation. IMPLICATIONS This study identifies mutant p53 as an essential player in ErbB2 and EGFR-mediated mammary tumorigenesis and indicates the potential translational importance of targeting mutant p53 in this subset of patients with breast cancer.
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Affiliation(s)
- Alisha R Yallowitz
- Department of Pathology, School of Medicine, Stony Brook University, Stony Brook, New York
| | - Dun Li
- Department of Pathology, School of Medicine, Stony Brook University, Stony Brook, New York
| | - Anthony Lobko
- Department of Pathology, School of Medicine, Stony Brook University, Stony Brook, New York
| | - Daniel Mott
- Department of Pathology, School of Medicine, Stony Brook University, Stony Brook, New York
| | - Alice Nemajerova
- Department of Pathology, School of Medicine, Stony Brook University, Stony Brook, New York
| | - Natalia Marchenko
- Department of Pathology, School of Medicine, Stony Brook University, Stony Brook, New York.
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13
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Manthey AL, Terrell AM, Wang Y, Taube JR, Yallowitz AR, Duncan MK. The Zeb proteins δEF1 and Sip1 may have distinct functions in lens cells following cataract surgery. Invest Ophthalmol Vis Sci 2014; 55:5445-55. [PMID: 25082886 DOI: 10.1167/iovs.14-14845] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
PURPOSE Posterior capsular opacification (PCO), the most prevalent side effect of cataract surgery, occurs when residual lens epithelial cells (LECs) undergo fiber cell differentiation or epithelial-to-mesenchymal transition (EMT). Here, we used a murine cataract surgery model to investigate the role of the Zeb proteins, Smad interacting protein 1 (Sip1) and δ-crystallin enhancer-binding factor 1 (δEF1), during PCO. METHODS Extracapsular extraction of lens fiber cells was performed on wild-type and Sip1 knockout mice. Protein expression patterns were assessed at multiple time points after surgery using confocal immunofluorescence. βB1-Crystallin mRNA levels were measured using quantitative RT-PCR. We used Transfac searches to identify δEF1 binding sites in the βB1-crystallin promoter and transfection analysis to test the ability of δEF1 to regulate βB1-crystallin expression. RESULTS δEF1, which, in other systems, can activate fibrotic genes (e.g., α-smooth muscle actin) and repress epithelial genes, upregulates by 48 hours after fiber cell removal. In culture, δEF1 repressed βB1-crystallin promoter activity, suggesting that it may also turn off lens gene expression following surgery, contributing to "fibrotic PCO" development. Sip1 also upregulates in LECs by 48 hours, but analysis of Sip1 knockout lenses demonstrated that Sip1 does not play a major role in EMT or fiber cell differentiation after surgery. However, Sip1 knockout LECs do express the ectodermal marker keratin 8, suggesting that Sip1 may limit the reprogramming of residual LECs to an embryonic state. CONCLUSIONS Zeb transcription factors likely play important, but distinct roles in PCO development after cataract surgery.
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Affiliation(s)
- Abby L Manthey
- Department of Biological Sciences, University of Delaware, Newark, Delaware, United States
| | - Anne M Terrell
- Department of Biological Sciences, University of Delaware, Newark, Delaware, United States
| | - Yan Wang
- Department of Biological Sciences, University of Delaware, Newark, Delaware, United States
| | - Jennifer R Taube
- Department of Biological Sciences, University of Delaware, Newark, Delaware, United States
| | - Alisha R Yallowitz
- Department of Biological Sciences, University of Delaware, Newark, Delaware, United States
| | - Melinda K Duncan
- Department of Biological Sciences, University of Delaware, Newark, Delaware, United States
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14
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Yallowitz AR, Alexandrova EM, Talos F, Xu S, Marchenko ND, Moll UM. p63 is a prosurvival factor in the adult mammary gland during post-lactational involution, affecting PI-MECs and ErbB2 tumorigenesis. Cell Death Differ 2014; 21:645-54. [PMID: 24440910 DOI: 10.1038/cdd.2013.199] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2013] [Revised: 12/13/2013] [Accepted: 12/13/2013] [Indexed: 01/31/2023] Open
Abstract
In embryogenesis, p63 is essential to develop mammary glands. In the adult mammary gland, p63 is highly expressed in the basal cell layer that comprises myoepithelial and interspersed stem/progenitor cells, and has limited expression in luminal epithelial cells. In adult skin, p63 has a crucial role in the maintenance of epithelial stem cells. However, it is unclear whether p63 also has an equivalent role as a stem/progenitor cell factor in adult mammary epithelium. We show that p63 is essential in vivo for the survival and maintenance of parity-identified mammary epithelial cells (PI-MECs), a pregnancy-induced heterogeneous population that survives post-lactational involution and contain multipotent progenitors that give rise to alveoli and ducts in subsequent pregnancies. p63+/- glands are normal in virgin, pregnant and lactating states. Importantly, however, during the apoptotic phase of post-lactational involution p63+/- glands show a threefold increase in epithelial cell death, concomitant with increased activation of the oncostatin M/Stat3 and p53 pro-apoptotic pathways, which are responsible for this phase. Thus, p63 is a physiologic antagonist of these pathways specifically in this regressive stage. After the restructuring phase when involution is complete, mammary glands of p63+/- mice again exhibit normal epithelial architecture by conventional histology. However, using Rosa(LSL-LacZ);WAP-Cre transgenics (LSL-LacZ, lox-stop-lox β-galactosidase), a genetic in vivo labeling system for PI-MECs, we find that p63+/- glands have a 30% reduction in the number of PI-MEC progenitors and their derivatives. Importantly, PI-MECs are also cellular targets of pregnancy-promoted ErbB2 tumorigenesis. Consistent with their PI-MEC pool reduction, one-time pregnant p63+/- ErbB2 mice are partially protected from breast tumorigenesis, exhibiting extended tumor-free and overall survival, and reduced tumor multiplicity compared with their p63+/+ ErbB2 littermates. Conversely, in virgin ErbB2 mice p63 heterozygosity provides no survival advantage. In sum, our data establish that p63 is an important survival factor for pregnancy-identified PI-MEC progenitors in breast tissue in vivo.
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Affiliation(s)
- A R Yallowitz
- Department of Pathology, Stony Brook University, School of Medicine, Stony Brook, NY 11794, USA
| | - E M Alexandrova
- Department of Pathology, Stony Brook University, School of Medicine, Stony Brook, NY 11794, USA
| | - F Talos
- Department of Pathology, Stony Brook University, School of Medicine, Stony Brook, NY 11794, USA
| | - S Xu
- Department of Pathology, Stony Brook University, School of Medicine, Stony Brook, NY 11794, USA
| | - N D Marchenko
- Department of Pathology, Stony Brook University, School of Medicine, Stony Brook, NY 11794, USA
| | - U M Moll
- Department of Pathology, Stony Brook University, School of Medicine, Stony Brook, NY 11794, USA
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15
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Vaseva AV, Yallowitz AR, Marchenko ND, Xu S, Moll UM. Blockade of Hsp90 by 17AAG antagonizes MDMX and synergizes with Nutlin to induce p53-mediated apoptosis in solid tumors. Cell Death Dis 2011; 2:e156. [PMID: 21562588 PMCID: PMC3122118 DOI: 10.1038/cddis.2011.39] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2011] [Accepted: 03/10/2011] [Indexed: 12/15/2022]
Abstract
Strategies to induce p53 activation in wtp53-retaining tumors carry high potential in cancer therapy. Nutlin, a potent highly selective MDM2 inhibitor, induces non-genotoxic p53 activation. Although Nutlin shows promise in promoting cell death in hematopoietic malignancies, a major roadblock is that most solid cancers do not undergo apoptosis but merely reversible growth arrest. p53 inhibition by unopposed MDMX is one major cause for apoptosis resistance to Nutlin. The Hsp90 chaperone is ubiquitously activated in cancer cells and supports oncogenic survival pathways, many of which antagonize p53. The Hsp90 inhibitor 17-allylamino-17-demethoxygeldanamycin (17AAG) is known to induce p53-dependent apoptosis. We show here that in multiple difficult-to-kill solid tumor cells 17AAG modulates several critical components that synergize with Nutlin-activated p53 signaling to convert Nutlin's transient cytostatic response into a cytotoxic killing response in vitro and in xenografts. Combined with Nutlin, 17AAG destabilizes MDMX, reduces MDM2, induces PUMA and inhibits oncogenic survival pathways, such as PI3K/AKT, which counteract p53 signaling at multiple levels. Mechanistically, 17AAG interferes with the repressive MDMX-p53 axis by inducing robust MDMX degradation, thereby markedly increasing p53 transcription compared with Nutlin alone. To our knowledge Nutlin+17AAG represents the first effective pharmacologic knockdown of MDMX. Our study identifies 17AAG as a promising synthetic lethal partner for a more efficient Nutlin-based therapy.
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Affiliation(s)
- A V Vaseva
- Graduate program in Molecular and Cellular Biology, Stony Brook University, Stony Brook, NY 11794, USA
- Department of Pathology, Stony Brook University, Stony Brook, NY 11794, USA
| | - A R Yallowitz
- Department of Pathology, Stony Brook University, Stony Brook, NY 11794, USA
| | - N D Marchenko
- Department of Pathology, Stony Brook University, Stony Brook, NY 11794, USA
| | - S Xu
- Department of Pathology, Stony Brook University, Stony Brook, NY 11794, USA
| | - U M Moll
- Department of Pathology, Stony Brook University, Stony Brook, NY 11794, USA
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16
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Koyama E, Yasuda T, Minugh-Purvis N, Kinumatsu T, Yallowitz AR, Wellik DM, Pacifici M. Hox11 genes establish synovial joint organization and phylogenetic characteristics in developing mouse zeugopod skeletal elements. Development 2010; 137:3795-800. [PMID: 20978074 DOI: 10.1242/dev.053447] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Hox11 genes are essential for zeugopod skeletal element development but their roles in synovial joint formation remain largely unknown. Here, we show that the elbow and knee joints of mouse embryos lacking all Hox11 paralogous genes are specifically remodeled and reorganized. The proximal ends of developing mutant ulna and radius elements became morphologically similar and formed an anatomically distinct elbow joint. The mutant ulna lacked the olecranon that normally attaches to the triceps brachii muscle tendon and connects the humerus to the ulna. In its place, an ulnar patella-like element developed that expressed lubricin on its ventral side facing the joint and was connected to the triceps muscle tendon. In mutant knees, both tibia and fibula fully articulated with an enlarged femoral epiphyseal end that accommodated both elements, and the neo-tripartite knee joint was enclosed in a single synovial cavity and displayed an additional anterior ligament. The mutant joints also exhibited a different organization of the superficial zone of articular cartilage that normally exerts an anti-friction function. In conclusion, Hox11 genes co-regulate and coordinate the development of zeugopod skeletal elements and adjacent elbow and knee joints, and dictate joint identity, morphogenesis and anatomical and functional organization. Notably, the ulnar patella and tripartite knee joints in the mouse mutants actually characterize several lower vertebrates, including certain reptiles and amphibians. The re-emergence of such anatomical structures suggests that their genetic blueprint is still present in the mouse genome but is normally modified to the needs of the mammalian joint-formation program by distinct Hox11 function.
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Affiliation(s)
- Eiki Koyama
- Department of Orthopaedic Surgery, College of Medicine, Thomas Jefferson University, Philadelphia, PA 19107, USA.
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Abstract
During embryonic development, the anterior-posterior body axis is specified in part by the combinatorial activities of Hox genes. Given the poor DNA binding specificity of Hox proteins, their interaction with cofactors to regulate target genes is critical. However, few regulatory partners or downstream target genes have been identified. Herein, we demonstrate that Hox11 paralogous proteins form a complex with Pax2 and Eya1 to directly activate expression of Six2 and Gdnf in the metanephric mesenchyme. We have identified the binding site within the Six2 enhancer necessary for Hox11-Eya1-Pax2-mediated activation and demonstrate that this site is essential for Six2 expression in vivo. Furthermore, genetic interactions between Hox11 and Eya1 are consistent with their participation in the same pathway. Thus, anterior-posterior-patterning Hox proteins interact with Pax2 and Eya1, factors important for nephrogenic mesoderm specification, to directly regulate the activation of downstream target genes during early kidney development.
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Affiliation(s)
- Ke-Qin Gong
- Division of Molecular Medicine and Genetics, Department of Internal Medicine, University of Michigan Medical Center, 109 Zina Pitcher, 3045 BSRB, Ann Arbor, MI 48109-2200, USA
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18
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Abstract
Unlike the rest of the axial skeleton, which develops solely from somitic mesoderm, patterning of the rib cage is complicated by its derivation from two distinct tissues. The thoracic skeleton is derived from both somitic mesoderm,which forms the vertebral bodies and ribs, and from lateral plate mesoderm,which forms the sternum. By generating mouse mutants in Hox5, Hox6and Hox9 paralogous group genes, along with a dissection of the Hox10 and Hox11 group mutants, several important conclusions regarding the nature of the `Hox code' in rib cage and axial skeleton development are revealed. First, axial patterning is consistently coded by the unique and redundant functions of Hox paralogous groups throughout the axial skeleton. Loss of paralogous function leads to anterior homeotic transformations of colinear regions throughout the somite-derived axial skeleton. In the thoracic region, Hox genes pattern the lateral plate-derived sternum in a non-colinear manner, independent from the patterning of the somite-derived vertebrae and vertebral ribs. Finally, between adjacent sets of paralogous mutants, the regions of vertebral phenotypes overlap considerably;however, each paralogous group imparts unique morphologies within these regions. In all cases examined, the next-most posterior Hox paralogous group does not prevent the function of the more-anterior Hox group in axial patterning. Thus, the `Hox code' in somitic mesoderm is the result of the distinct, graded effects of two or more Hox paralogous groups functioning in any anteroposterior location.
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Affiliation(s)
- Daniel C McIntyre
- Division of Molecular Medicine and Genetics, Department of Internal Medicine, University of Michigan Medical Center, 109 Zina Pitcher, Ann Arbor, MI 48109-2200, USA
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