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Smart K, Kramer AH, Smart S, Hodgson L, Sharp DJ. Fidgetin-like 2 depletion enhances cell migration by regulating GEF-H1, RhoA, and FAK. Biophys J 2023; 122:3600-3610. [PMID: 36523161 PMCID: PMC10541466 DOI: 10.1016/j.bpj.2022.12.018] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 10/31/2022] [Accepted: 12/14/2022] [Indexed: 12/23/2022] Open
Abstract
The microtubule (MT) cytoskeleton and its dynamics play an important role in cell migration. Depletion of the microtubule-severing enzyme Fidgetin-like 2 (FL2), a regulator of MT dynamics at the leading edge of migrating cells, leads to faster and more efficient cell migration. Here we examine how siRNA knockdown of FL2 increases cell motility. Förster resonance energy transfer biosensor studies shows that FL2 knockdown decreases activation of the p21 Rho GTPase, RhoA, and its activator GEF-H1. Immunofluorescence studies reveal that GEF-H1 is sequestered by the increased MT density resulting from FL2 depletion. Activation of the Rho GTPase, Rac1, however, does not change after FL2 knockdown. Furthermore, FL2 depletion leads to an increase in focal adhesion kinase activation at the leading edge, as shown by immunofluorescence studies, but no change in actin dynamics, as shown by fluorescence recovery after photobleaching. We believe these results expand our understanding of the role of MT dynamics in cell migration and offer new insights into RhoA and Rac1 regulation.
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Affiliation(s)
- Karishma Smart
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, New York
| | - Adam H Kramer
- Microcures, Inc., Research and Development, Bronx, New York
| | | | - Louis Hodgson
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, New York; Gruss-Lipper Biophotonics Center, Albert Einstein College of Medicine, Bronx, New York.
| | - David J Sharp
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, New York; Microcures, Inc., Research and Development, Bronx, New York.
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2
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Baker L, Tar M, Kramer AH, Villegas GA, Charafeddine RA, Vafaeva O, Nacharaju P, Friedman J, Davies KP, Sharp DJ. Fidgetin-like 2 negatively regulates axonal growth and can be targeted to promote functional nerve regeneration. JCI Insight 2021; 6:138484. [PMID: 33872220 PMCID: PMC8262307 DOI: 10.1172/jci.insight.138484] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [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: 03/26/2020] [Accepted: 04/01/2021] [Indexed: 02/05/2023] Open
Abstract
The microtubule (MT) cytoskeleton plays a critical role in axon growth and guidance. Here, we identify the MT-severing enzyme fidgetin-like 2 (FL2) as a negative regulator of axon regeneration and a therapeutic target for promoting nerve regeneration after injury. Genetic knockout of FL2 in cultured adult dorsal root ganglion neurons resulted in longer axons and attenuated growth cone retraction in response to inhibitory molecules. Given the axonal growth-promoting effects of FL2 depletion in vitro, we tested whether FL2 could be targeted to promote regeneration in a rodent model of cavernous nerve (CN) injury. The CNs are parasympathetic nerves that regulate blood flow to the penis, which are commonly damaged during radical prostatectomy (RP), resulting in erectile dysfunction (ED). Application of FL2-siRNA after CN injury significantly enhanced functional nerve recovery. Remarkably, following bilateral nerve transection, visible and functional nerve regeneration was observed in 7 out of 8 animals treated with FL2-siRNA, while no control-treated animals exhibited regeneration. These studies identify FL2 as a promising therapeutic target for enhancing regeneration after peripheral nerve injury and for mitigating neurogenic ED after RP - a condition for which, at present, only poor treatment options exist.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | - David J. Sharp
- Department of Physiology and Biophysics
- Dominick P. Purpura Department of Neuroscience, and
- Department of Ophthalmology and Visual Sciences, Albert Einstein College of Medicine, Bronx, New York, USA
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3
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Wang J, Dey A, Kramer AH, Miao Y, Liu J, Baker L, Friedman JM, Nacharaju P, Chuck RS, Zhang C, Sharp DJ. A Novel Therapeutic Approach to Corneal Alkaline Burn Model by Targeting Fidgetin-Like 2, a Microtubule Regulator. Transl Vis Sci Technol 2021; 10:17. [PMID: 33510956 PMCID: PMC7804583 DOI: 10.1167/tvst.10.1.17] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 06/19/2020] [Accepted: 12/11/2020] [Indexed: 12/26/2022] Open
Abstract
Purpose The purpose of this study was to determine the efficacy of nanoparticle-encapsulated Fidgetin-like 2 (FL2) siRNA (FL2-NPsi), a novel therapeutic agent targeting the FL2 gene, for the treatment of corneal alkaline chemical injury. Methods Eighty 12-week-old, male Sprague-Dawley rats were divided evenly into 8 treatment groups: prednisolone, empty nanoparticles, control-NPsi (1 µM, 10 µM, and 20 µM) and FL2-NPsi (1 µM, 10 µM, and 20 µM). An alkaline burn was induced onto the cornea of each rat, which was then treated for 14 days according to group assignment. Clinical, histopathologic, and immunohistochemical analyses were conducted to assess for wound healing. FL2-NPsi-mediated knockdown of FL2 was confirmed by in vitro quantitative polymerase chain reaction (qPCR). Toxicity assays were performed to assess for apoptosis (terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate nick-end labeling [TUNEL] assay) and nerve damage (whole mount immunochemical staining). Statistical analyses were performed using Student's t-test and ANOVA. Results Compared with controls, FL2-NPsi-treated groups demonstrated enhanced corneal wound healing, with the 10 and 20 µM FL2-NPsi-treated groups demonstrating maximum rates of corneal re-epithelialization as assessed by ImageJ software, enhanced corneal transparency, and improved stromal organization on histology. Immunohistochemical analysis of vascular endothelial cells, macrophages, and neutrophils did not show significant differences between treatment groups. FL2-NPsi was not found to be toxic to nerves or induce apoptosis (p = 0.917). Conclusions Dose-response studies found both 10 and 20 µM FL2-NPsi to be efficacious in this rat model. FL2-NPsi may offer a novel treatment for corneal alkaline chemical injuries. Translational Relevance Basic cell biology findings about the microtubule cytoskeleton were used to design a therapeutic to enhance corneal cell migration, highlighting the promise of targeting microtubules to regulate corneal wound healing.
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Affiliation(s)
- Jessie Wang
- Department of Ophthalmology & Visual Sciences, Montefiore Medical Center, Albert Einstein College of Medicine, Bronx, NY, USA.,MicroCures, Inc., Bronx, NY, USA
| | | | | | - Yuan Miao
- Department of Ophthalmology & Visual Sciences, Montefiore Medical Center, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Juan Liu
- Department of Ophthalmology & Visual Sciences, Montefiore Medical Center, Albert Einstein College of Medicine, Bronx, NY, USA
| | | | - Joel M Friedman
- Department of Physiology & Biophysics, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Parimala Nacharaju
- Department of Physiology & Biophysics, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Roy S Chuck
- Department of Ophthalmology & Visual Sciences, Montefiore Medical Center, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Cheng Zhang
- Department of Ophthalmology & Visual Sciences, Montefiore Medical Center, Albert Einstein College of Medicine, Bronx, NY, USA
| | - David J Sharp
- Department of Ophthalmology & Visual Sciences, Montefiore Medical Center, Albert Einstein College of Medicine, Bronx, NY, USA.,MicroCures, Inc., Bronx, NY, USA.,Department of Physiology & Biophysics, Albert Einstein College of Medicine, Bronx, NY, USA.,Dominick P. Purpura Department of Neuroscience, Albert Einstein College of Medicine, Bronx, NY, USA
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4
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O'Rourke BP, Kramer AH, Cao LL, Inayathullah M, Guzik H, Rajadas J, Nosanchuk JD, Sharp DJ. Fidgetin-Like 2 siRNA Enhances the Wound Healing Capability of a Surfactant Polymer Dressing. Adv Wound Care (New Rochelle) 2019; 8:91-100. [PMID: 30911440 PMCID: PMC6430983 DOI: 10.1089/wound.2018.0827] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [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: 08/01/2018] [Accepted: 09/07/2018] [Indexed: 02/02/2023] Open
Abstract
Microtubules (MTs) are intracellular polymers that provide structure to the cell, serve as railways for intracellular transport, and regulate many cellular activities, including cell migration. The dynamicity and function of the MT cytoskeleton are determined in large part by its regulatory proteins, including the recently discovered MT severing enzyme Fidgetin-like 2 (FL2). Downregulation of FL2 expression with small interfering RNA (siRNA) results in a more than twofold increase in cell migration rate in vitro as well as translates into improved wound-healing outcomes in in vivo mouse models. Here we utilized a commercially available surfactant polymer dressing (SPD) as a vehicle to deliver FL2 siRNA. To this end we incorporated collagen microparticles containing FL2 siRNA into SPD (SPD-FL2-siRNA) for direct application to the injury site. Topical application of SPD-FL2 siRNA to murine models of full-thickness excision wounds and full-thickness burn wounds resulted in significant improvements in the rate and quality of wound healing, as measured clinically and histologically, compared with controls. Wound healing occurred more rapidly and with high fidelity, resulting in properly organized collagen substructure. Taken together, these findings indicate that the incorporation of FL2 siRNA into existing treatment options is a promising avenue to improve wound outcomes.
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Affiliation(s)
| | - Adam H. Kramer
- Physiology and Biophysics, and Albert Einstein College of Medicine, Bronx, New York
| | - Longyue L. Cao
- Department of Medicine, Children's Hospital Boston, Boston, Massachusetts
- Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, Bronx, New York
| | - Mohammed Inayathullah
- Biomaterials and Advanced Drug Delivery Laboratory, Stanford University, Palo Alto, California
| | - Hillary Guzik
- Analytical Imaging Facility, Albert Einstein College of Medicine, Bronx, New York
| | - Jayakumar Rajadas
- Biomaterials and Advanced Drug Delivery Laboratory, Stanford University, Palo Alto, California
| | - Joshua D. Nosanchuk
- Department of Medicine, Albert Einstein College of Medicine, Bronx, New York
- Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, New York
| | - David J. Sharp
- MicroCures, Inc., Research and Development, Bronx, New York
- Physiology and Biophysics, and Albert Einstein College of Medicine, Bronx, New York
- Department of Ophthalmology and Visual Sciences, and Albert Einstein College of Medicine, Bronx, New York
- Department of Neuroscience, Albert Einstein College of Medicine, Bronx, New York
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Wang Y, Wu B, Lu P, Zhang D, Wu B, Varshney S, Del Monte-Nieto G, Zhuang Z, Charafeddine R, Kramer AH, Sibinga NE, Frangogiannis NG, Kitsis RN, Adams RH, Alitalo K, Sharp DJ, Harvey RP, Stanley P, Zhou B. Uncontrolled angiogenic precursor expansion causes coronary artery anomalies in mice lacking Pofut1. Nat Commun 2017; 8:578. [PMID: 28924218 PMCID: PMC5603578 DOI: 10.1038/s41467-017-00654-w] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [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: 01/11/2017] [Accepted: 07/18/2017] [Indexed: 12/13/2022] Open
Abstract
Coronary artery anomalies may cause life-threatening cardiac complications; however, developmental mechanisms underpinning coronary artery formation remain ill-defined. Here we identify an angiogenic cell population for coronary artery formation in mice. Regulated by a DLL4/NOTCH1/VEGFA/VEGFR2 signaling axis, these angiogenic cells generate mature coronary arteries. The NOTCH modulator POFUT1 critically regulates this signaling axis. POFUT1 inactivation disrupts signaling events and results in excessive angiogenic cell proliferation and plexus formation, leading to anomalous coronary arteries, myocardial infarction and heart failure. Simultaneous VEGFR2 inactivation fully rescues these defects. These findings show that dysregulated angiogenic precursors link coronary anomalies to ischemic heart disease.Though coronary arteries are crucial for heart function, the mechanisms guiding their formation are largely unknown. Here, Wang et al. identify a unique, endocardially-derived angiogenic precursor cell population for coronary artery formation in mice and show that a DLL4/NOTCH1/VEGFA/VEGFR2 signaling axis is key for coronary artery development.
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Affiliation(s)
- Yidong Wang
- Departments of Genetics, Pediatrics, and Medicine (Cardiology), Wilf Cardiovascular Research Institute, Albert Einstein College of Medicine, Bronx, New York, 10461, USA
| | - Bingruo Wu
- Departments of Genetics, Pediatrics, and Medicine (Cardiology), Wilf Cardiovascular Research Institute, Albert Einstein College of Medicine, Bronx, New York, 10461, USA
| | - Pengfei Lu
- Departments of Genetics, Pediatrics, and Medicine (Cardiology), Wilf Cardiovascular Research Institute, Albert Einstein College of Medicine, Bronx, New York, 10461, USA
| | - Donghong Zhang
- Departments of Genetics, Pediatrics, and Medicine (Cardiology), Wilf Cardiovascular Research Institute, Albert Einstein College of Medicine, Bronx, New York, 10461, USA
| | - Brian Wu
- Departments of Genetics, Pediatrics, and Medicine (Cardiology), Wilf Cardiovascular Research Institute, Albert Einstein College of Medicine, Bronx, New York, 10461, USA
| | - Shweta Varshney
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY, 10461, USA
| | - Gonzalo Del Monte-Nieto
- Developmental and Stem Cell Biology Division, Victor Chang Cardiac Research Institute, Darlinghurst, NSW, 2010, Australia.,St. Vincent's Clinical School, University of New South Wales, Kensington, NSW, 2052, Australia
| | - Zhenwu Zhuang
- Department of Medicine, Yale University, New Haven, Connecticut, 06510, USA
| | - Rabab Charafeddine
- Department of Physiology and Biophysics, Albert Einstein College of Medicine, Bronx, New York, 10461, USA
| | - Adam H Kramer
- Department of Physiology and Biophysics, Albert Einstein College of Medicine, Bronx, New York, 10461, USA
| | - Nicolas E Sibinga
- Departments of Medicine, Developmental and Molecular Biology, Wilf Cardiovascular Research Institute, Albert Einstein College of Medicine, Bronx, New York, 10461, USA
| | - Nikolaos G Frangogiannis
- Departments of Medicine, Microbiology and Immunology, Wilf Cardiovascular Research Institute, Albert Einstein College of Medicine, Bronx, New York, 10461, USA
| | - Richard N Kitsis
- Departments of Medicine and Cell Biology, Wilf Cardiovascular Research Institute, Albert Einstein College of Medicine, Bronx, New York, 10461, USA
| | - Ralf H Adams
- Department of Tissue Morphogenesis, Max-Planck-Institute for Molecular Biomedicine, Röntgenstraße 20, and Faculty of Medicine, University of Münster, 48149, Münster, Germany
| | - Kari Alitalo
- Wihuri Research Institute, Biomedicum Helsinki, Haartmaninkatu 8, FI-00290, Helsinki, Finland
| | - David J Sharp
- Department of Physiology and Biophysics, Albert Einstein College of Medicine, Bronx, New York, 10461, USA
| | - Richard P Harvey
- Developmental and Stem Cell Biology Division, Victor Chang Cardiac Research Institute, Darlinghurst, NSW, 2010, Australia.,St. Vincent's Clinical School, University of New South Wales, Kensington, NSW, 2052, Australia.,School of Biotechnology and Biomolecular Science, University of New South Wales, Kensington, NSW, 2052, Australia
| | - Pamela Stanley
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY, 10461, USA
| | - Bin Zhou
- Departments of Genetics, Pediatrics, and Medicine (Cardiology), Wilf Cardiovascular Research Institute, Albert Einstein College of Medicine, Bronx, New York, 10461, USA. .,Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, 210029, China.
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6
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Kramer AH, Kadye R, Houseman PS, Prinsloo E. Mitochondrial STAT3 and reactive oxygen species: A fulcrum of adipogenesis? JAKSTAT 2015; 4:e1084084. [PMID: 27127727 DOI: 10.1080/21623996.2015.1084084] [Citation(s) in RCA: 7] [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] [Received: 06/09/2015] [Revised: 08/07/2015] [Accepted: 08/11/2015] [Indexed: 02/08/2023] Open
Abstract
The balance between cellular lineages can be controlled by reactive oxygen species (ROS). Cellular differentiation into adipocytes is highly dependent on the production of ROS to initiate the process through activation of multiple interlinked factors that stimulate mitotic clonal expansion and cellular maturation. The signal transducer and activator of transcription family of signaling proteins have accepted roles in adipogenesis and associated lipogenesis. Non-canonical mitochondrial localization of STAT3 and other members of the STAT family however opens up new avenues for investigation of its role in the aforementioned processes. Following recent observations of differences in mitochondrially localized serine 727 phosphorylated STAT3 (mtSTAT3-pS727) in preadipocytes and adipocytes, here, we hypothesize and speculate further on the role of mitochondrial STAT3 in adipogenesis.
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Affiliation(s)
- Adam H Kramer
- Biotechnology Innovation Center; Rhodes University ; Grahamstown, South Africa
| | - Rose Kadye
- Biotechnology Innovation Center; Rhodes University ; Grahamstown, South Africa
| | | | - Earl Prinsloo
- Biotechnology Innovation Center; Rhodes University ; Grahamstown, South Africa
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7
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Kramer AH, Edkins AL, Hoppe HC, Prinsloo E. Dynamic Mitochondrial Localisation of STAT3 in the Cellular Adipogenesis Model 3T3-L1. J Cell Biochem 2015; 116:1232-40. [DOI: 10.1002/jcb.25076] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Accepted: 12/19/2014] [Indexed: 11/09/2022]
Affiliation(s)
- Adam H. Kramer
- Biomedical Biotechnology Research Unit; Biotechnology Innovation Centre; Rhodes University; PO Box 94 Grahamstown 6140 South Africa
| | - Adrienne L. Edkins
- Department of Biochemistry and Microbiology; Biomedical Biotechnology Research Unit; Rhodes University; PO Box 94 Grahamstown 6140 South Africa
| | - Heinrich C. Hoppe
- Department of Biochemistry and Microbiology; Rhodes University; PO Box 94 Grahamstown 6140 South Africa
| | - Earl Prinsloo
- Biomedical Biotechnology Research Unit; Biotechnology Innovation Centre; Rhodes University; PO Box 94 Grahamstown 6140 South Africa
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8
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Kadye R, Kramer AH, Joos-Vandewalle J, Parsons M, Njengele Z, Hoppe H, Prinsloo E. Guardian of the furnace: mitochondria, TRAP1, ROS and stem cell maintenance. IUBMB Life 2013; 66:42-5. [PMID: 24382805 DOI: 10.1002/iub.1234] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [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: 09/19/2013] [Accepted: 11/14/2013] [Indexed: 12/15/2022]
Abstract
Mitochondria are key to eukaryotic cell survival and their activity is linked to generation of reactive oxygen species (ROS) which in turn acts as both an intracellular signal and an effective executioner of cells with regards to cellular senescence. The mitochondrial molecular chaperone tumor necrosis factor receptor associated protein 1 (TRAP1) is often termed the cytoprotective chaperone for its role in cancer cell survival and protection from apoptosis. Here, we hypothesize that TRAP1 serves to modulate mitochondrial activity in stem cell maintenance, survival and differentiation.
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Affiliation(s)
- Rose Kadye
- Biomedical Biotechnology Research Unit, Department of Biochemistry, Microbiology and Biotechnology, Rhodes University, Grahamstown, South Africa
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9
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Abstract
Heat shock protein 90 (Hsp90) functionally modulates signal transduction. The signal transducer and activator of transcription 3 (STAT3) mediates interleukin-6 family cytokine signaling. Aberrant activation and mutation of STAT3 is associated with oncogenesis and immune disorders, respectively. Hsp90 and STAT3 have previously been shown to colocalize and coimmunoprecipitate in common complexes. Surface plasmon resonance spectroscopy revealed a direct, high affinity specific interaction between recombinant Hsp90β and STAT3β in the presence and absence of adenosine triphosphate (ATP) in molar excess. Furthermore, comparative analysis using a phosphomimetic mutation at tyrosine 705 showed that the direct interaction appeared to favor neither unactivated nor activated STAT3. Destabilizing mutation of STAT3 at arginine residues 414/417 to alanine in the DNA-binding domain, previously shown to disrupt nuclear translocation in vivo, reduced interaction with a STAT3 DNA binding site oligonucleotide and Hsp90β in vitro, indicating that STAT3 requires a functional DNA-binding domain for full direct interaction with Hsp90. Site-directed mutagenesis of a mammalian STAT3-EGFP-N1 fusion construct at RR414/417 and subsequent transfection into human MCF7 epithelial breast cancer cells showed no impaired nuclear translocation when observed by confocal laser scanning microscopy. However, costaining for Hsp90α/β isoforms and colocalization analysis revealed a defined decrease in pixel-on-pixel colocalization compared with the wild-type confirming the requirement of the DNA-binding domain for high-affinity interaction.
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Affiliation(s)
- Earl Prinsloo
- Biomedical Biotechnology Research Unit, Department of Biochemistry, Microbiology and Biotechnology, Rhodes University, Grahamstown, South Africa.
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10
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Mul WP, Drent E, Jansens PJ, Kramer AH, Sonnemans MH. Chain end-groups reveal two states for palladium-based polyketone catalyst species. J Am Chem Soc 2001; 123:5350-1. [PMID: 11457399 DOI: 10.1021/ja003800i] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- W P Mul
- Shell Research and Technology Centre, Amsterdam P.O. Box 38000, 1030 BN Amsterdam, The Netherlands.
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11
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Kramer AH, McCullough DW. The prevalence of otitis media with effusion among Inuit children. Int J Circumpolar Health 1999; 57 Suppl 1:265-7. [PMID: 10093287] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023] Open
Abstract
PURPOSE Studies over the past 30 years have shown a decline in the prevalence of chronic otitis media in some parts of the Arctic, presumably largely due to more prompt treatment, preventing acute infections from becoming chronic. In contrast, some researchers have suggested that the prevalence of otitis media with effusion has increased. The purpose of this study was to determine the prevalence of otitis media with effusion among children aged 6-17 years in Sanikiluaq, an Inuit community in the Keewatin District of the Northwest Territories. METHODS A cohort of 126 children at the local community school was examined and assessed by otoscopy, audiometry, and impedance testing. RESULTS Four percent of children were found to have otitis media with effusion causing significant hearing loss. An additional 17% had otitis media with effusion, with minimal or no detectable hearing loss. Thus, the prevalence of otitis media with effusion in Sanikiluaq school-age children is 4% to 21%. There are few previously published data with which to compare these findings. In the past, otitis media with effusion was infrequently reported among the Inuit. Therefore, our results may suggest an increasing prevalence over the past several decades. If these results are representative of other communities, otitis media with effusion is a significant health problem among the Inuit.
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Affiliation(s)
- A H Kramer
- Faculty of Medicine, University of Manitoba, Winnipeg, Canada
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