1
|
Qian F, Nettleford SK, Zhou J, Arner BE, Hall MA, Sharma A, Annageldiyev C, Rossi RM, Tukaramrao DB, Sarkar D, Hegde S, Gandhi UH, Finch ER, Goodfield L, Quickel MD, Claxton DF, Paulson RF, Prabhu KS. Activation of GPR44 decreases severity of myeloid leukemia via specific targeting of leukemia initiating stem cells. Cell Rep 2023; 42:112794. [PMID: 37459233 PMCID: PMC10428076 DOI: 10.1016/j.celrep.2023.112794] [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: 07/22/2022] [Revised: 03/25/2023] [Accepted: 06/27/2023] [Indexed: 07/29/2023] Open
Abstract
Relapse of acute myeloid leukemia (AML) remains a significant concern due to persistent leukemia-initiating stem cells (LICs) that are typically not targeted by most existing therapies. Using a murine AML model, human AML cell lines, and patient samples, we show that AML LICs are sensitive to endogenous and exogenous cyclopentenone prostaglandin-J (CyPG), Δ12-PGJ2, and 15d-PGJ2, which are increased upon dietary selenium supplementation via the cyclooxygenase-hematopoietic PGD synthase pathway. CyPGs are endogenous ligands for peroxisome proliferator-activated receptor gamma and GPR44 (CRTH2; PTGDR2). Deletion of GPR44 in a mouse model of AML exacerbated the disease suggesting that GPR44 activation mediates selenium-mediated apoptosis of LICs. Transcriptomic analysis of GPR44-/- LICs indicated that GPR44 activation by CyPGs suppressed KRAS-mediated MAPK and PI3K/AKT/mTOR signaling pathways, to enhance apoptosis. Our studies show the role of GPR44, providing mechanistic underpinnings of the chemopreventive and chemotherapeutic properties of selenium and CyPGs in AML.
Collapse
Affiliation(s)
- Fenghua Qian
- Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, PA 16802, USA
| | - Shaneice K Nettleford
- Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, PA 16802, USA
| | - Jiayan Zhou
- Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, PA 16802, USA
| | - Brooke E Arner
- Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, PA 16802, USA
| | - Molly A Hall
- Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, PA 16802, USA
| | - Arati Sharma
- Department of Medicine, Division of Hematology and Oncology, Penn State Cancer Institute, The Pennsylvania State University College of Medicine, Hershey, PA 17033, USA
| | - Charyguly Annageldiyev
- Department of Medicine, Division of Hematology and Oncology, Penn State Cancer Institute, The Pennsylvania State University College of Medicine, Hershey, PA 17033, USA
| | - Randy M Rossi
- Transgenic Core Facility, Huck Institute of the Life Sciences, The Pennsylvania State University, University Park, PA 16802, USA
| | - Diwakar B Tukaramrao
- Department of Medicine, Division of Hematology and Oncology, Penn State Cancer Institute, The Pennsylvania State University College of Medicine, Hershey, PA 17033, USA
| | - Deborpita Sarkar
- Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, PA 16802, USA
| | - Shailaja Hegde
- Hoxworth Blood Center, Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA
| | - Ujjawal H Gandhi
- Department of Hematology and Oncology, University of North Carolina Health, Cary, NC 27518, USA
| | - Emily R Finch
- Department of Biostatistics, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Laura Goodfield
- Immunooncology Division, Bicycle Therapeutics, Boston, MA 02140, USA
| | - Michael D Quickel
- Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, PA 16802, USA
| | - David F Claxton
- Department of Medicine, Division of Hematology and Oncology, Penn State Cancer Institute, The Pennsylvania State University College of Medicine, Hershey, PA 17033, USA
| | - Robert F Paulson
- Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, PA 16802, USA.
| | - K Sandeep Prabhu
- Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, PA 16802, USA.
| |
Collapse
|
2
|
Marriott AE, Dagley JL, Hegde S, Steven A, Fricks C, DiCosty U, Mansour A, Campbell EJ, Wilson CM, Gusovsky F, Ward SA, Hong WD, O'Neill P, Moorhead A, McCall S, McCall JW, Taylor MJ, Turner JD. Dirofilariasis mouse models for heartworm preclinical research. Front Microbiol 2023; 14:1208301. [PMID: 37426014 PMCID: PMC10324412 DOI: 10.3389/fmicb.2023.1208301] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Accepted: 05/30/2023] [Indexed: 07/11/2023] Open
Abstract
Introduction Dirofilariasis, including heartworm disease, is a major emergent veterinary parasitic infection and a human zoonosis. Currently, experimental infections of cats and dogs are used in veterinary heartworm preclinical drug research. Methods As a refined alternative in vivo heartworm preventative drug screen, we assessed lymphopenic mouse strains with ablation of the interleukin-2/7 common gamma chain (γc) as susceptible to the larval development phase of Dirofilaria immitis. Results Non-obese diabetic (NOD) severe combined immunodeficiency (SCID)γc-/- (NSG and NXG) and recombination-activating gene (RAG)2-/-γc-/- mouse strains yielded viable D. immitis larvae at 2-4 weeks post-infection, including the use of different batches of D. immitis infectious larvae, different D. immitis isolates, and at different laboratories. Mice did not display any clinical signs associated with infection for up to 4 weeks. Developing larvae were found in subcutaneous and muscle fascia tissues, which is the natural site of this stage of heartworm in dogs. Compared with in vitro-propagated larvae at day 14, in vivo-derived larvae had completed the L4 molt, were significantly larger, and contained expanded Wolbachia endobacteria titres. We established an ex vivo L4 paralytic screening system whereby assays with moxidectin or levamisole highlighted discrepancies in relative drug sensitivities in comparison with in vitro-reared L4 D. immitis. We demonstrated effective depletion of Wolbachia by 70%-90% in D. immitis L4 following 2- to 7-day oral in vivo exposures of NSG- or NXG-infected mice with doxycycline or the rapid-acting investigational drug, AWZ1066S. We validated NSG and NXG D. immitis mouse models as a filaricide screen by in vivo treatments with single injections of moxidectin, which mediated a 60%-88% reduction in L4 larvae at 14-28 days. Discussion Future adoption of these mouse models will benefit end-user laboratories conducting research and development of novel heartworm preventatives via increased access, rapid turnaround, and reduced costs and may simultaneously decrease the need for experimental cat or dog use.
Collapse
Affiliation(s)
- A. E. Marriott
- Department of Tropical Disease Biology, Centre for Drugs and Diagnostics, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool, United Kingdom
| | - J. L. Dagley
- Department of Tropical Disease Biology, Centre for Drugs and Diagnostics, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool, United Kingdom
| | - S. Hegde
- Department of Tropical Disease Biology, Centre for Drugs and Diagnostics, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool, United Kingdom
| | - A. Steven
- Department of Tropical Disease Biology, Centre for Drugs and Diagnostics, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool, United Kingdom
| | - C. Fricks
- TRS Laboratories Inc, Athens, GA, United States
| | - U. DiCosty
- TRS Laboratories Inc, Athens, GA, United States
| | - A. Mansour
- TRS Laboratories Inc, Athens, GA, United States
| | - E. J. Campbell
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA, United States
| | - C. M. Wilson
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA, United States
| | - F. Gusovsky
- Eisai Global Health, Cambridge, MA, United States
| | - S. A. Ward
- Department of Tropical Disease Biology, Centre for Drugs and Diagnostics, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool, United Kingdom
| | - W. D. Hong
- Department of Chemistry, University of Liverpool, Liverpool, United Kingdom
| | - P. O'Neill
- Department of Chemistry, University of Liverpool, Liverpool, United Kingdom
| | - A. Moorhead
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA, United States
| | - S. McCall
- TRS Laboratories Inc, Athens, GA, United States
| | - J. W. McCall
- TRS Laboratories Inc, Athens, GA, United States
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA, United States
| | - M. J. Taylor
- Department of Tropical Disease Biology, Centre for Drugs and Diagnostics, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool, United Kingdom
| | - J. D. Turner
- Department of Tropical Disease Biology, Centre for Drugs and Diagnostics, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool, United Kingdom
| |
Collapse
|
3
|
Abstract
PURPOSE OF REVIEW Hemorrhage is a major cause of preventable death in trauma and cancer. Trauma induced coagulopathy and cancer-associated endotheliopathy remain major therapeutic challenges. Early, aggressive administration of blood-derived products with hypothesized increased clotting potency has been proposed. A series of early- and late-phase clinical trials testing the safety and/or efficacy of lyophilized plasma and new forms of platelet products in humans have provided light on the future of alternative blood component therapies. This review intends to contextualize and provide a critical review of the information provided by these trials. RECENT FINDINGS The beneficial effect of existing freeze-dried plasma products may not be as high as initially anticipated when tested in randomized, multicenter clinical trials. A next-generation freeze dried plasma product has shown safety in an early phase clinical trial and other freeze-dried plasma and spray-dried plasma with promising preclinical profiles are embarking in first-in-human trials. New platelet additive solutions and forms of cryopreservation or lyophilization of platelets with long-term shelf-life have demonstrated feasibility and logistical advantages. SUMMARY Recent trials have confirmed logistical advantages of modified plasma and platelet products in the treatment or prophylaxis of bleeding. However, their postulated increased potency profile remains unconfirmed.
Collapse
Affiliation(s)
- Shailaja Hegde
- Hoxworth Blood Center, University of Cincinnati Academic Health Center
| | - Yi Zheng
- Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA
| | - Jose A Cancelas
- Hoxworth Blood Center, University of Cincinnati Academic Health Center
- Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA
| |
Collapse
|
4
|
Marron T, Maier B, LaMarche N, Hegde S, Belabed M, Mattiuz R, Hennequin C, LeBerichel J, Park M, Hall N, Ogrady D, Fitzgerald B, Gomez J, Doroshow D, Veluswamy R, Rolfo C, Smith C, Rohs N, Yankelevitz D, Chaddha U, Harkin T, Beasley M, Hirsch F, Merad M. P2.12-05 Cancer and Atopy: Parallel Drivers? IL-4 Blockade Synergizes with PD-L1 Blockade to Reverse Type-2Mediated Immunosuppression. J Thorac Oncol 2022. [DOI: 10.1016/j.jtho.2022.07.253] [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: 10/14/2022]
|
5
|
Hegde S, Gasilina A, Wunderlich M, Lin Y, Buchholzer M, Krumbach OHF, Akbarzadeh M, Ahmadian MR, Seibel W, Zheng Y, Perentesis JP, Mizukawa BE, Vinnedge LP, Cancelas JA, Nassar NN. Inhibition of the RacGEF VAV3 by the small molecule IODVA1 impedes RAC signaling and overcomes resistance to tyrosine kinase inhibition in acute lymphoblastic leukemia. Leukemia 2022; 36:637-647. [PMID: 34711926 PMCID: PMC8885421 DOI: 10.1038/s41375-021-01455-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [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: 06/28/2021] [Revised: 10/01/2021] [Accepted: 10/15/2021] [Indexed: 01/09/2023]
Abstract
Aberrant RHO guanine nucleotide exchange factor (RhoGEF) activation is chief mechanism driving abnormal activation of their GTPase targets in transformation and tumorigenesis. Consequently, a small-molecule inhibitor of RhoGEF can make an anti-cancer drug. We used cellular, mouse, and humanized models of RAC-dependent BCR-ABL1-driven and Ph-like acute lymphoblastic leukemia to identify VAV3, a tyrosine phosphorylation-dependent RacGEF, as the target of the small molecule IODVA1. We show that through binding to VAV3, IODVA1 inhibits RAC activation and signaling and increases pro-apoptotic activity in BCR-ABL1-transformed cells. Consistent with this mechanism of action, cellular and animal models of BCR-ABL1-induced leukemia in Vav3-null background do not respond to IODVA1. By durably decreasing in vivo RAC signaling, IODVA1 eradicates leukemic propagating activity of TKI-resistant BCR-ABL1(T315I) B-ALL cells after treatment withdrawal. Importantly, IODVA1 suppresses the leukemic burden in the treatment refractory pediatric Ph+ and TKI-resistant Ph+ B-ALL patient-derived xenograft models better than standard-of-care dasatinib or ponatinib and provides a more durable response after treatment withdrawal. Pediatric leukemia samples with diverse genetic lesions show high sensitivity to IODVA1 ex vivo and this sensitivity is VAV3 dependent. IODVA1 thus spearheads a novel class of drugs that inhibits a RacGEF and holds promise as an anti-tumor therapy.
Collapse
Affiliation(s)
- Shailaja Hegde
- Division of Experimental Hematology and Cancer Biology, Children's Hospital Research Foundation, 3333 Burnet Ave, Cincinnati, OH, 45229, USA
- Hoxworth Blood Center, University of Cincinnati Academic Health Center, Cincinnati, OH, USA
| | - Anjelika Gasilina
- Division of Experimental Hematology and Cancer Biology, Children's Hospital Research Foundation, 3333 Burnet Ave, Cincinnati, OH, 45229, USA
| | - Mark Wunderlich
- Division of Experimental Hematology and Cancer Biology, Children's Hospital Research Foundation, 3333 Burnet Ave, Cincinnati, OH, 45229, USA
| | - Yuan Lin
- Division of Experimental Hematology and Cancer Biology, Children's Hospital Research Foundation, 3333 Burnet Ave, Cincinnati, OH, 45229, USA
| | - Marcel Buchholzer
- Institute of Biochemistry and Molecular Biology II, Medical Faculty, Heinrich-Heine-University, Düsseldorf, 40225, Germany
| | - Oliver H F Krumbach
- Institute of Biochemistry and Molecular Biology II, Medical Faculty, Heinrich-Heine-University, Düsseldorf, 40225, Germany
| | - Mohammad Akbarzadeh
- Institute of Biochemistry and Molecular Biology II, Medical Faculty, Heinrich-Heine-University, Düsseldorf, 40225, Germany
| | - Mohammad Reza Ahmadian
- Institute of Biochemistry and Molecular Biology II, Medical Faculty, Heinrich-Heine-University, Düsseldorf, 40225, Germany
| | - William Seibel
- Division of Oncology, Cincinnati Children's Hospital Medical Center, Cancer and Blood Diseases Institute, 3333 Burnet Ave, Cincinnati, OH, 45229, USA
| | - Yi Zheng
- Division of Experimental Hematology and Cancer Biology, Children's Hospital Research Foundation, 3333 Burnet Ave, Cincinnati, OH, 45229, USA
- Department of Pediatrics, University of Cincinnati College of Medicine, 3230 Eden Ave, Cincinnati, OH, 45267, USA
| | - John P Perentesis
- Division of Oncology, Cincinnati Children's Hospital Medical Center, Cancer and Blood Diseases Institute, 3333 Burnet Ave, Cincinnati, OH, 45229, USA
| | - Benjamin E Mizukawa
- Division of Experimental Hematology and Cancer Biology, Children's Hospital Research Foundation, 3333 Burnet Ave, Cincinnati, OH, 45229, USA
| | - Lisa Privette Vinnedge
- Division of Oncology, Cincinnati Children's Hospital Medical Center, Cancer and Blood Diseases Institute, 3333 Burnet Ave, Cincinnati, OH, 45229, USA
- Department of Pediatrics, University of Cincinnati College of Medicine, 3230 Eden Ave, Cincinnati, OH, 45267, USA
| | - José A Cancelas
- Division of Experimental Hematology and Cancer Biology, Children's Hospital Research Foundation, 3333 Burnet Ave, Cincinnati, OH, 45229, USA
- Hoxworth Blood Center, University of Cincinnati Academic Health Center, Cincinnati, OH, USA
- Department of Pediatrics, University of Cincinnati College of Medicine, 3230 Eden Ave, Cincinnati, OH, 45267, USA
| | - Nicolas N Nassar
- Division of Experimental Hematology and Cancer Biology, Children's Hospital Research Foundation, 3333 Burnet Ave, Cincinnati, OH, 45229, USA.
- Department of Pediatrics, University of Cincinnati College of Medicine, 3230 Eden Ave, Cincinnati, OH, 45267, USA.
| |
Collapse
|
6
|
Onkaramurthy M, Vishwakarma KK, Singh P, Hegde S, Azeemuddin MM, Rafiq M, Babu UV. Herbal Formulations Ameliorates Chronic Venous Insufficiency, Venotonicity and Elastase Inhibition in the Management of Varicose Veins: A Preclinical Study. Indian J Pharm Sci 2022. [DOI: 10.36468/pharmaceutical-sciences.1000] [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: 11/22/2022] Open
|
7
|
Bhardwaj P, Thattaruparambil VP, Vellaisamy G, Mahadevaiah S, Hegde S. Gastric teratoma presenting as melena in the newborn: A case report. J Neonatal Perinatal Med 2022; 15:667-669. [PMID: 35694937 DOI: 10.3233/npm-210931] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Melena is reported in 1 of 350 to 400 new-borns. Significant upper gastrointestinal bleeding in a neonate with an antenatally diagnosed abdominal mass has not been reported before. This case highlights an unusual presentation of a gastric teratoma and proposes a probable embryological explanation for the site of occurrence.
Collapse
Affiliation(s)
- P Bhardwaj
- Department of Pediatric Surgery, St. John's Medical College Hospital, Bengaluru, India
| | - V P Thattaruparambil
- Department of Pediatric Surgery, St. John's Medical College Hospital, Bengaluru, India
| | - G Vellaisamy
- Department of Pathology, St. John's Medical College, Bengaluru, India
| | - S Mahadevaiah
- Department of Pediatric Surgery, St. John's Medical College Hospital, Bengaluru, India
| | - S Hegde
- Department of Pediatric Surgery, St. John's Medical College Hospital, Bengaluru, India
| |
Collapse
|
8
|
Nassar NN, Hegde S, Wunderlich K, Lin Y, Ahmadian R, Seibel W, Zheng Y, Mizukawa BE, Vinnedge LP, Cancelas JA. Abstract LB198: Inhibition of the RAC Activator VAV3 by the small molecule IODVA1 impedes RAC signaling & overcomes resistance to tyrosine kinase inhibition in lymphoblastic leukemia. Cancer Res 2021. [DOI: 10.1158/1538-7445.am2021-lb198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Aberrant activation of RHO guanine nucleotide exchange factors (RhoGEFs) is a chief mechanism driving abnormal activation of their RhoGTPase targets in transformation and tumorigenesis. Consequently, a small molecule inhibitor of RhoGEF activities can be used as an anti-cancer drug. Herein, we used cellular, mouse, and humanized models of RAC-dependent BCR-ABL1-driven and Ph-like lymphoblastic leukemia to identify VAV3, a tyrosine phosphorylation-dependent RacGEF, as the target of the small molecule IODVA1. We show that IODVA1 binds tightly to VAV3, inhibits RAC activation and signaling, and increases pro-apoptotic activity in BCR-ABL1-transformed cells only. Consistent with this mechanism of action, both VAV3-deficient leukemic cells and mouse models of BCR-ABL1 leukemia do not respond to IODVA1. IODVA1 eradicates leukemic propagating activity of TKI-resistant BCR-ABL1(T315I) B-ALL cells after treatment withdrawal by decreasing RAC signaling in vivo. Importantly, IODVA1 is superior to standard of care dasatinib and ponatinib at prolonging the survival of PDX models of relapsed pediatric Ph+ and TKI-resistant Ph+ B-ALL with commonly found genetic mutations especially after treatment withdrawal. Cells representing pediatric ALL patients with diverse genetic lesions are highly sensitive to IODVA1 ex vivo and this sensitivity is VAV3-dependent. IODVA1 thus spearheads a novel class of drugs that inhibits a RacGEF and holds promise as an anti-tumor therapeutic agent.
Citation Format: Nicolas N. Nassar, Shailaja Hegde, Kark Wunderlich, Yuan Lin, Reza Ahmadian, William Seibel, Yi Zheng, Benjamin E. Mizukawa, Lisa Privette Vinnedge, Jose A. Cancelas. Inhibition of the RAC Activator VAV3 by the small molecule IODVA1 impedes RAC signaling & overcomes resistance to tyrosine kinase inhibition in lymphoblastic leukemia [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2021; 2021 Apr 10-15 and May 17-21. Philadelphia (PA): AACR; Cancer Res 2021;81(13_Suppl):Abstract nr LB198.
Collapse
Affiliation(s)
| | - Shailaja Hegde
- 1Cincinnati Children's Hospital Medical Center, Cincinnati, OH
| | - Kark Wunderlich
- 1Cincinnati Children's Hospital Medical Center, Cincinnati, OH
| | - Yuan Lin
- 1Cincinnati Children's Hospital Medical Center, Cincinnati, OH
| | | | - William Seibel
- 1Cincinnati Children's Hospital Medical Center, Cincinnati, OH
| | - Yi Zheng
- 1Cincinnati Children's Hospital Medical Center, Cincinnati, OH
| | | | | | | |
Collapse
|
9
|
Serrano-Lopez J, Hegde S, Kumar S, Serrano J, Fang J, Wellendorf AM, Roche PA, Rangel Y, Carrington LJ, Geiger H, Grimes HL, Luther S, Maillard I, Sanchez-Garcia J, Starczynowski DT, Cancelas JA. Inflammation rapidly recruits mammalian GMP and MDP from bone marrow into regional lymphatics. eLife 2021; 10:e66190. [PMID: 33830019 PMCID: PMC8137144 DOI: 10.7554/elife.66190] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2021] [Accepted: 04/07/2021] [Indexed: 12/22/2022] Open
Abstract
Innate immune cellular effectors are actively consumed during systemic inflammation, but the systemic traffic and the mechanisms that support their replenishment remain unknown. Here, we demonstrate that acute systemic inflammation induces the emergent activation of a previously unrecognized system of rapid migration of granulocyte-macrophage progenitors and committed macrophage-dendritic progenitors, but not other progenitors or stem cells, from bone marrow (BM) to regional lymphatic capillaries. The progenitor traffic to the systemic lymphatic circulation is mediated by Ccl19/Ccr7 and is NF-κB independent, Traf6/IκB-kinase/SNAP23 activation dependent, and is responsible for the secretion of pre-stored Ccl19 by a subpopulation of CD205+/CD172a+ conventional dendritic cells type 2 and upregulation of BM myeloid progenitor Ccr7 signaling. Mature myeloid Traf6 signaling is anti-inflammatory and necessary for lymph node myeloid cell development. This report unveils the existence and the mechanistic basis of a very early direct traffic of myeloid progenitors from BM to lymphatics during inflammation.
Collapse
Affiliation(s)
- Juana Serrano-Lopez
- Divisions of Experimental Hematology, Cincinnati Children’s Hospital Medical Center, University of Cincinnati College of MedicineCincinnatiUnited States
| | - Shailaja Hegde
- Divisions of Experimental Hematology, Cincinnati Children’s Hospital Medical Center, University of Cincinnati College of MedicineCincinnatiUnited States
- Hoxworth Blood Center, University of Cincinnati College of MedicineCincinnatiUnited States
| | - Sachin Kumar
- Divisions of Experimental Hematology, Cincinnati Children’s Hospital Medical Center, University of Cincinnati College of MedicineCincinnatiUnited States
| | - Josefina Serrano
- Hematology Department, Reina Sofía University Hospital/Maimonides Biomedical Research Institute of Córdoba (IMIBIC)/University of CórdobaCórdobaSpain
| | - Jing Fang
- Divisions of Experimental Hematology, Cincinnati Children’s Hospital Medical Center, University of Cincinnati College of MedicineCincinnatiUnited States
| | - Ashley M Wellendorf
- Divisions of Experimental Hematology, Cincinnati Children’s Hospital Medical Center, University of Cincinnati College of MedicineCincinnatiUnited States
| | - Paul A Roche
- Center for Cancer Research, National Cancer InstituteBethesdaUnited States
- Experimental Immunology Branch, National Cancer Institute, National Institutes of HealthBethesdaUnited States
| | - Yamileth Rangel
- Hematology Department, Reina Sofía University Hospital/Maimonides Biomedical Research Institute of Córdoba (IMIBIC)/University of CórdobaCórdobaSpain
| | | | - Hartmut Geiger
- Divisions of Experimental Hematology, Cincinnati Children’s Hospital Medical Center, University of Cincinnati College of MedicineCincinnatiUnited States
- Institute of Molecular Medicine, Ulm UniversityUlmGermany
| | - H Leighton Grimes
- Immunobiology, Department of Pediatrics, Cincinnati Children’s Hospital Medical Center, University of Cincinnati College of MedicineCincinnatiUnited States
| | - Sanjiv Luther
- Center for Immunity and Infection, Department of Biochemistry, University of LausanneEpalingesSwitzerland
| | - Ivan Maillard
- University of Pennsylvania Perelman School of MedicinePhiladelphiaUnited States
| | - Joaquin Sanchez-Garcia
- Hematology Department, Reina Sofía University Hospital/Maimonides Biomedical Research Institute of Córdoba (IMIBIC)/University of CórdobaCórdobaSpain
| | - Daniel T Starczynowski
- Divisions of Experimental Hematology, Cincinnati Children’s Hospital Medical Center, University of Cincinnati College of MedicineCincinnatiUnited States
- Department of Cancer Biology, University of CincinnatiCincinnatiUnited States
| | - Jose A Cancelas
- Divisions of Experimental Hematology, Cincinnati Children’s Hospital Medical Center, University of Cincinnati College of MedicineCincinnatiUnited States
- Hoxworth Blood Center, University of Cincinnati College of MedicineCincinnatiUnited States
| |
Collapse
|
10
|
Hegde S, Wellendorf AM, Zheng Y, Cancelas JA. Antioxidant prevents clearance of hemostatically competent platelets after long-term cold storage. Transfusion 2020; 61:557-567. [PMID: 33247486 DOI: 10.1111/trf.16200] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [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: 08/16/2020] [Revised: 09/27/2020] [Accepted: 10/23/2020] [Indexed: 12/16/2022]
Abstract
BACKGROUND Cold storage of platelets (PLTs) has the potential advantage of prolonging storage time while reducing posttransfusion infection given the decreased likelihood of bacterial outgrowth during storage and possibly beneficial effects in treating bleeding patients. However, cold storage reduces PLT survival through the induction of complex storage lesions, which are more accentuated when storage is prolonged. STUDY DESIGN AND METHODS Whole blood-derived PLT-rich plasma concentrates from seven PLT pools (n = 5 donors per pool). PLT additive solution was added (67%/33% plasma) and the product was split into 50-mL bags. Split units were stored in the presence or absence of 1 mM of N-acetylcysteine (NAC) under agitation for up to 14 days at room temperature or in the cold and were analyzed for PLT activation, fibrinogen-dependent spreading, microparticle formation, mitochondrial respiratory activity, reactive oxygen species (ROS) generation, as well as in vivo survival and bleeding time correction in immunodeficient mice. RESULTS Cold storage of PLTs for 7 days or longer induces significant PLT activation, cytoskeletal damage, impaired fibrinogen spreading, enhances mitochondrial metabolic decoupling and ROS generation, and increases macrophage-dependent phagocytosis and macrophage-independent clearance. Addition of NAC prevents PLT clearance and allows a correction of the prolonged bleeding time in thrombocytopenic, aspirin-treated, immunodeficient mice. CONCLUSIONS Long-term cold storage induces mitochondrial uncoupling and increased proton leak and ROS generation. The resulting ROS is a crucial contributor to the increased macrophage-dependent and -independent clearance of functional PLTs and can be prevented by the antioxidant NAC in a magnesium-containing additive solution.
Collapse
Affiliation(s)
- Shailaja Hegde
- Hoxworth Blood Center, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA.,Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | - Ashley M Wellendorf
- Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | - Yi Zheng
- Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | - Jose A Cancelas
- Hoxworth Blood Center, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA.,Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| |
Collapse
|
11
|
Shariff M, Doshi R, Pedreira Vaz I, Adalja D, Krishnan A, Hegde S, Kumar A. Impella versus intra-aortic balloon pump in cardiogenic shock: a meta-analysis assessing 30-days mortality. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.1130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Introduction
Cardiogenic shock is linked with eminent morbidity and mortality despite advances in treatment modality. Adjuvant treatment modalities to provide mechanical haemodynamic support in the form of intra-aortic balloon pump (IABP) or Impella are being used among patients with cardiogenic shock. The Impella prunes left ventricular preload, whereas, IABP persuades after load reduction and both contribute to improved cardiac output. A few underpowered randomised control trials (RCTs) and observational studies compared short term mortality benefit of Impella juxtaposed to IABP among patients with cardiogenic shock.
Purpose
A meta-analysis of RCTs and observational studies researching the short-term mortality in cardiogenic shock comparing Impella to IABP was executed.
Methods
The databases PubMed, EMBASE and Cochrane were searched systematically to identify relevant RCTs and observational studies contrasting Impella to IABP and reporting 30-days mortality as outcomes. The search terms used were “Impella”, “IAPB”, “intra-aortic balloon pump” and all word variations were utilised. The search was conducted from the debut of the databases up to January 2020. Two reviewers independently and in tandem performed data screening and extraction from identified articles. Inverse variance method with Paule-Mandel estimator for tau2 and Hartung-Knapp adjustment was used to calculate Risk Ratio with 95% confidence interval. Heterogeneity was assessed using I2 statistics. Furthermore, we calculated the 95% predictive interval for the pooled estimate. All statistical analysis for this meta-analysis was carried out using R statistical software version 3.6.2 using the package meta ( ). Additionally, Grading of Recommendations, Assessment, Development and Evaluations (GRADE) criteria were used to assess the certainty of evidence.
Results
Five studies constituting 728 patients were included in the final analysis. Two were RCTs (ISAR-SHOCK trial and IMPRESS in Severe Shock trial), one study was a propensity score matched observational study and two were unmatched observational studies. There was no difference in the risk of 30-days mortality in patients treated with Impella as compared to IABP [Risk Ratio: 0.97, 95% confidence interval: 0.66–1.41, I2: 32%]. To account for the heterogeneity, we calculated 95% predictive interval: 0.46–2.02. Thus, very low certainty of evidence concluded no difference in the risk of 30-days mortality among cardiogenic shock patients treated with Impella in opposition to IABP.
Conclusion
This meta-analysis comparing Impella juxtaposed with IABP demonstrated no difference in the risk of 30-days mortality among patients with cardiogenic shock.
30-days Mortality
Funding Acknowledgement
Type of funding source: None
Collapse
Affiliation(s)
- M Shariff
- St John's Medical College Hospital, Critical Care Medicine, Bangalore, India
| | - R Doshi
- University of Nevada, Internal Medicine, Reno, United States of America
| | - I Pedreira Vaz
- Jackson Memorial Hospital, Internal Medicine, Miami, United States of America
| | - D Adalja
- Gotri Medical Education and Research Centre, Internal Medicine, Vadodara, India
| | - A Krishnan
- JJM Medical College, Internal Medicine, Davangere, India
| | - S Hegde
- Sri Jayadeva Institute of Cardiovascular Sciences and Research, Cardiology, Mysore, India
| | - A Kumar
- St John's Medical College Hospital, Critical Care Medicine, Bangalore, India
| |
Collapse
|
12
|
Hengst JA, Hegde S, Paulson RF, Yun JK. Development of SKI-349, a dual-targeted inhibitor of sphingosine kinase and microtubule polymerization. Bioorg Med Chem Lett 2020; 30:127453. [PMID: 32736077 DOI: 10.1016/j.bmcl.2020.127453] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [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: 05/07/2020] [Revised: 07/22/2020] [Accepted: 07/24/2020] [Indexed: 11/28/2022]
Abstract
Our sphingosine kinase inhibitor (SKI) optimization studies originated with the optimization of the SKI-I chemotype by replacement of the substituted benzyl rings with substituted phenyl rings giving rise to the discovery of SKI-178. We have recently reported that SKI-178 is a dual-targeted inhibitor of both sphingosine kinase isoforms (SphK1/2) and a microtubule disrupting agent (MDA). In mechanism-of-action studies, we have shown that these two separate actions synergize to induce cancer cell death in acute myeloid leukemia (AML) cell and animal models. Owning to the effectiveness of SKI-178, we sought to further refine the chemotype while maintaining "on-target" SKI and MDA activities. Herein, we modified the "linker region" between the substituted phenyl rings of SKI-178 through a structure guided approach. These studies have yielded the discovery of an SKI-178 congener, SKI-349, with log-fold enhancements in both SphK inhibition and cytotoxic potency. Importantly, SKI-349 also demonstrates log-fold improvements in therapeutic efficacy in a retro-viral transduction model of MLL-AF9 AML as compared to previous studies with SKI-178. Together, our results strengthen the hypothesis that simultaneous targeting of the sphingosine kinases (SphK1/2) and the induction of mitotic spindle assembly checkpoint arrest, via microtubule disruption, might be an effective therapeutic strategy for hematological malignancies including AML.
Collapse
Affiliation(s)
- Jeremy A Hengst
- Department of Pharmacology, Pennsylvania State University College of Medicine, 500 University Drive, Hershey, PA, USA
| | - Shailaja Hegde
- Hoxworth Blood Center, University of Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
| | - Robert F Paulson
- Department of Veterinary and Biomedical Sciences, Pennsylvania State University, University Park, PA, USA
| | - Jong K Yun
- Department of Pharmacology, Pennsylvania State University College of Medicine, 500 University Drive, Hershey, PA, USA.
| |
Collapse
|
13
|
Misra U, TcR R, Kumaravelu S, Arjundas D, Wadia R, Nair R, Alurkar A, Pujarai S, Udhar M, Palasdeonkar N, Buddha S, Kumar S, Salvadeeswaran M, Deasai S, Pammidimukkala V, Sharma M, Kumar K, Percival G, Hegde S, Machhavada K. Indian registry in ischemic stroke- tenecteplase (IRIS- TNK)- An interim analysis. J Neurol Sci 2019. [DOI: 10.1016/j.jns.2019.10.690] [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: 11/30/2022]
|
14
|
N V, Hegde S, Kamble N, Yadav R, Pal PK. Cognitive profile of Parkinson’s disease with and without deficits in motor speed. J Neurol Sci 2019. [DOI: 10.1016/j.jns.2019.10.378] [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: 10/25/2022]
|
15
|
Hegde S, Patodia A, Shah K, Dixit U. The applicability of the Demirjian, Willems and Chaillet standards to age estimation of 5-15 year old Indian children. J Forensic Odontostomatol 2019; 37:40-50. [PMID: 31187742 PMCID: PMC6875241] [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] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
BACKGROUND Demirjian's method of age estimation has been reported to overestimate age and Willems' method to give consistently more accurate results. Not enough, however, is known about the applicability of Chaillet's standards. AIM The present study aimed to compare the accuracy of Demirjian's, Willems' and Chaillet's standards in age estimation of 5 to 15 year-old Indian children. DESIGN In this cross-sectional observational study, three methods were compared for accuracy in estimating the age of 1200 Indian children aged 5-15 years. RESULTS Demirjian's method overestimated age by +0.24 ± 0.80 years, +0.11 ± 0.81years and +0.19 ± 0.80 years in boys, girls and the total sample, respectively. With Willems' method, overestimations of +0.09 ± 0.80 years, +0.08 ± 0.80 years and +0.09 ± 0.80 years were obtained in boys, girls and the total sample, respectively. Chaillet's method underestimated age by -0.12 ± 0.69 years, -0.45 ± 0.88 years and -0.25 ± 0.83 years in boys, girls and the total sample, respectively. Statistically significant differences were observed between dental and chronological ages with all methods (p < 0.001). Significant sex-based differences were observed only with Demirjian's and Chaillet's methods (p < 0.05). CONCLUSION Willems' method was the most accurate in age estimation, followed by Demirjian's and Chaillet's methods. While Demirjian's method was more accurate than Chaillet's in females, Chaillet's method better predicted the age of males.
Collapse
Affiliation(s)
- S Hegde
- Department of Pediatric Dentistry, Pacific Dental College and Hospital, Udaipur, Rajasthan, India
| | - A Patodia
- Department of Pediatric Dentistry, Pacific Dental College and Hospital, Udaipur, Rajasthan, India
| | - K Shah
- Department of Pediatric Dentistry, Pacific Dental College and Hospital, Udaipur, Rajasthan, India
| | - U Dixit
- Department of Pediatric and Preventive Dentistry, D. Y. Patil University- School of Dentistry, Navi Mumbai, Maharashtra, India
| |
Collapse
|
16
|
Nayak RC, Hegde S, Althoff MJ, Wellendorf AM, Mohmoud F, Perentesis J, Reina-Campos M, Reynaud D, Zheng Y, Diaz-Meco MT, Moscat J, Cancelas JA. The signaling axis atypical protein kinase C λ/ι-Satb2 mediates leukemic transformation of B-cell progenitors. Nat Commun 2019; 10:46. [PMID: 30610188 PMCID: PMC6320370 DOI: 10.1038/s41467-018-07846-y] [Citation(s) in RCA: 17] [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: 12/30/2017] [Accepted: 11/21/2018] [Indexed: 01/01/2023] Open
Abstract
Epigenetically regulated transcriptional plasticity has been proposed as a mechanism of differentiation arrest and resistance to therapy. BCR-ABL leukemias result from leukemic stem cell/progenitor transformation and represent an opportunity to identify epigenetic progress contributing to lineage leukemogenesis. Primary human and murine BCR-ABL+ leukemic progenitors have increased activation of Cdc42 and the downstream atypical protein kinase C (aPKC). While the isoform aPKCζ behaves as a leukemic suppressor, aPKCλ/ι is critically required for oncogenic progenitor proliferation, survival, and B-cell differentiation arrest, but not for normal B-cell lineage differentiation. In vitro and in vivo B-cell transformation by BCR-ABL requires the downregulation of key genes in the B-cell differentiation program through an aPKC λ/ι-Erk dependent Etv5/Satb2 chromatin repressive signaling complex. Genetic or pharmacological targeting of aPKC impairs human oncogenic addicted leukemias. Therefore, the aPKCλ/ι-SATB2 signaling cascade is required for leukemic BCR-ABL+ B-cell progenitor transformation and is amenable to non-tyrosine kinase inhibition. The upstream pathways regulating leukemic transcriptional plasticity for differentiation arrest and resistance to therapy are unclear. Here the authors show that aPKC λ/ι-controls leukemic B-cell precursor differentiation arrest trough RAC/MEK/ERK/SATB2 epigenetic repression
Collapse
Affiliation(s)
- R C Nayak
- Division of Experimental Hematology, Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, 3333 Burnet Ave., Cincinnati, OH, 45229, USA
| | - S Hegde
- Division of Experimental Hematology, Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, 3333 Burnet Ave., Cincinnati, OH, 45229, USA.,Hoxworth Blood Center, University of Cincinnati, 3130 Highland Ave., Cincinnati, OH, 45267, USA
| | - M J Althoff
- Division of Experimental Hematology, Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, 3333 Burnet Ave., Cincinnati, OH, 45229, USA.,Hoxworth Blood Center, University of Cincinnati, 3130 Highland Ave., Cincinnati, OH, 45267, USA.,Graduate Program of Cancer & Cell Biology, University of Cincinnati College of Medicine, Cincinnati, OH, 45267, USA
| | - A M Wellendorf
- Division of Experimental Hematology, Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, 3333 Burnet Ave., Cincinnati, OH, 45229, USA
| | - F Mohmoud
- Graduate Program of Cancer & Cell Biology, University of Cincinnati College of Medicine, Cincinnati, OH, 45267, USA
| | - J Perentesis
- Division of Oncology, Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, 3333 Burnet Ave., Cincinnati, OH, 45229, USA
| | - M Reina-Campos
- Cancer Metabolism and Signaling Networks Program, Sanford Burnham Prebys Medical Discovery Institute, 10901 North Torrey Pines Road, La Jolla, CA, 92037, USA
| | - D Reynaud
- Division of Experimental Hematology, Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, 3333 Burnet Ave., Cincinnati, OH, 45229, USA
| | - Y Zheng
- Division of Experimental Hematology, Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, 3333 Burnet Ave., Cincinnati, OH, 45229, USA
| | - M T Diaz-Meco
- Cancer Metabolism and Signaling Networks Program, Sanford Burnham Prebys Medical Discovery Institute, 10901 North Torrey Pines Road, La Jolla, CA, 92037, USA
| | - J Moscat
- Cancer Metabolism and Signaling Networks Program, Sanford Burnham Prebys Medical Discovery Institute, 10901 North Torrey Pines Road, La Jolla, CA, 92037, USA
| | - J A Cancelas
- Division of Experimental Hematology, Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, 3333 Burnet Ave., Cincinnati, OH, 45229, USA. .,Hoxworth Blood Center, University of Cincinnati, 3130 Highland Ave., Cincinnati, OH, 45267, USA. .,Graduate Program of Cancer & Cell Biology, University of Cincinnati College of Medicine, Cincinnati, OH, 45267, USA.
| |
Collapse
|
17
|
Hegde S, Bawa M, Mahajan JK, Rao KLN. Erb's palsy complicating a case of annular pancreas. J Neonatal Perinatal Med 2018; 11:97-99. [PMID: 29689736 DOI: 10.3233/npm-1816156] [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] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
We report an unusual presentation of annular pancreas with pneumoperitoneum in a newborn with an associated left sided Erb's palsy. The neurological deficit caused considerable confusion in the diagnosis and unexpected complications after surgery. We highlight the importance of clinical examination and the complications that an Erb's palsy can cause. This unusual triad of Erb's palsy, eventration of diaphragm and annular pancreas has hitherto not been described in literature.
Collapse
Affiliation(s)
- S Hegde
- Department of Pediatric Surgery, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - M Bawa
- Department of Pediatric Surgery, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - J K Mahajan
- Department of Pediatric Surgery, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - K L N Rao
- Department of Pediatric Surgery, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| |
Collapse
|
18
|
Pathak G, Agostino MJ, Bishara K, Capell WR, Fisher JL, Hegde S, Ibrahim BA, Pilarzyk K, Sabin C, Tuczkewycz T, Wilson S, Kelly MP. PDE11A negatively regulates lithium responsivity. Mol Psychiatry 2017; 22:1714-1724. [PMID: 27646265 PMCID: PMC5359083 DOI: 10.1038/mp.2016.155] [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] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Revised: 07/13/2016] [Accepted: 07/18/2016] [Indexed: 01/15/2023]
Abstract
Lithium responsivity in patients with bipolar disorder has been genetically associated with Phosphodiesterase 11A (PDE11A), and lithium decreases PDE11A mRNA in induced pluripotent stem cell-derived hippocampal neurons originating from lithium-responsive patients. PDE11 is an enzyme uniquely enriched in the hippocampus that breaks down cyclic AMP and cyclic GMP. Here we determined whether decreasing PDE11A expression is sufficient to increase lithium responsivity in mice. In dorsal hippocampus and ventral hippocampus (VHIPP), lithium-responsive C57BL/6J and 129S6/SvEvTac mice show decreased PDE11A4 protein expression relative to lithium-unresponsive BALB/cJ mice. In VHIPP, C57BL/6J mice also show differences in PDE11A4 compartmentalization relative to BALB/cJ mice. In contrast, neither PDE2A nor PDE10A expression differ among the strains. The compartment-specific differences in PDE11A4 protein expression are explained by a coding single-nucleotide polymorphism (SNP) at amino acid 499, which falls within the GAF-B homodimerization domain. Relative to the BALB/cJ 499T, the C57BL/6J 499A decreases PDE11A4 homodimerization, which removes PDE11A4 from the membrane. Consistent with the observation that lower PDE11A4 expression correlates with better lithium responsiveness, we found that Pde11a knockout mice (KO) given 0.4% lithium chow for 3+ weeks exhibit greater lithium responsivity relative to wild-type (WT) littermates in tail suspension, an antidepressant-predictive assay, and amphetamine hyperlocomotion, an anti-manic predictive assay. Reduced PDE11A4 expression may represent a lithium-sensitive pathophysiology, because both C57BL/6J and Pde11a KO mice show increased expression of the pro-inflammatory cytokine interleukin-6 (IL-6) relative to BALB/cJ and PDE11A WT mice, respectively. Our finding that PDE11A4 negatively regulates lithium responsivity in mice suggests that the PDE11A SNPs identified in patients may be functionally relevant.
Collapse
Affiliation(s)
- G Pathak
- Department of Pharmacology, Physiology & Neuroscience, University of South Carolina School of Medicine, Columbia, SC, USA
| | | | - K Bishara
- Department of Pharmacology, Physiology & Neuroscience, University of South Carolina School of Medicine, Columbia, SC, USA
| | - W R Capell
- Department of Pharmacology, Physiology & Neuroscience, University of South Carolina School of Medicine, Columbia, SC, USA
| | - J L Fisher
- Department of Pharmacology, Physiology & Neuroscience, University of South Carolina School of Medicine, Columbia, SC, USA
| | - S Hegde
- Department of Pharmacology, Physiology & Neuroscience, University of South Carolina School of Medicine, Columbia, SC, USA
| | - B A Ibrahim
- Department of Pharmacology, Physiology & Neuroscience, University of South Carolina School of Medicine, Columbia, SC, USA
| | - K Pilarzyk
- Department of Pharmacology, Physiology & Neuroscience, University of South Carolina School of Medicine, Columbia, SC, USA
| | - C Sabin
- Department of Pharmacology, Physiology & Neuroscience, University of South Carolina School of Medicine, Columbia, SC, USA
| | | | - S Wilson
- Department of Pharmacology, Physiology & Neuroscience, University of South Carolina School of Medicine, Columbia, SC, USA
| | - M P Kelly
- Department of Pharmacology, Physiology & Neuroscience, University of South Carolina School of Medicine, Columbia, SC, USA
| |
Collapse
|
19
|
Roy A, Hegde S, Srinivas M. Sequelae of stroke a prospective study. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.2778] [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: 11/30/2022]
|
20
|
Kalz L, Kalz-Füller B, Hegde S, Schwanitz G. Polymorphisms of Q-band Heterochromatin: Qualitative and Quantitative Analyses of Features in 3 Ethnic Groups (Europeans, Indians, and Turks). INT J HUM GENET 2017. [DOI: 10.1080/09723757.2005.11885919] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- L. Kalz
- Institute for Human Genetics, Bonn, Germany
| | | | - S. Hegde
- Manipal Hospital, Bangalore, India
| | | |
Collapse
|
21
|
Hengst JA, Dick TE, Sharma A, Doi K, Hegde S, Tan SF, Geffert LM, Fox TE, Sharma AK, Desai D, Amin S, Kester M, Loughran TP, Paulson RF, Claxton DF, Wang HG, Yun JK. SKI-178: A Multitargeted Inhibitor of Sphingosine Kinase and Microtubule Dynamics Demonstrating Therapeutic Efficacy in Acute Myeloid Leukemia Models. Cancer Transl Med 2017; 3:109-121. [PMID: 28890935 DOI: 10.4103/ctm.ctm_7_17] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [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: 12/17/2022] Open
Abstract
AIM To further characterize the selectivity, mechanism-of-action and therapeutic efficacy of the novel small molecule inhibitor, SKI-178. METHODS Using the state-of-the-art Cellular Thermal Shift Assay (CETSA) technique to detect "direct target engagement" of proteins intact cells, in vitro and in vivo assays, pharmacological assays and multiple mouse models of acute myeloid leukemia (AML). RESULTS Herein, we demonstrate that SKI-178 directly target engages both Sphingosine Kinase 1 and 2. We also present evidence that, in addition to its actions as a Sphingosine Kinase Inhibitor, SKI-178 functions as a microtubule network disrupting agent both in vitro and in intact cells. Interestingly, we separately demonstrate that simultaneous SphK inhibition and microtubule disruption synergistically induces apoptosis in AML cell lines. Furthermore, we demonstrate that SKI-178 is well tolerated in normal healthy mice. Most importantly, we demonstrate that SKI-178 has therapeutic efficacy in several mouse models of AML. CONCLUSION SKI-178 is a multi-targeted agent that functions both as an inhibitor of the SphKs as well as a disruptor of the microtubule network. SKI-178 induced apoptosis arises from a synergistic interaction of these two activities. SKI-178 is safe and effective in mouse models of AML, supporting its further development as a multi-targeted anti-cancer therapeutic agent.
Collapse
Affiliation(s)
- Jeremy A Hengst
- Department of Pharmacology, Penn State Hershey College of Medicine, Hershey, PA, USA.,The Jake Gittlen Laboratories for Cancer Research, The Pennsylvania State University College of Medicine, Hershey, PA, USA
| | - Taryn E Dick
- Department of Pharmacology, Penn State Hershey College of Medicine, Hershey, PA, USA.,The Jake Gittlen Laboratories for Cancer Research, The Pennsylvania State University College of Medicine, Hershey, PA, USA
| | - Arati Sharma
- Department of Pharmacology, Penn State Hershey College of Medicine, Hershey, PA, USA
| | - Kenichiro Doi
- Department of Pediatrics, Penn State Hershey College of Medicine, Hershey, PA, USA
| | - Shailaja Hegde
- Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, PA, USA
| | - Su-Fern Tan
- University of Virginia Cancer Center, University of Virginia, Charlottesville, VA, USA
| | - Laura M Geffert
- Department of Pharmacology, Penn State Hershey College of Medicine, Hershey, PA, USA.,The Jake Gittlen Laboratories for Cancer Research, The Pennsylvania State University College of Medicine, Hershey, PA, USA
| | - Todd E Fox
- University of Virginia Cancer Center, University of Virginia, Charlottesville, VA, USA
| | - Arun K Sharma
- Department of Pharmacology, Penn State Hershey College of Medicine, Hershey, PA, USA
| | - Dhimant Desai
- Department of Pharmacology, Penn State Hershey College of Medicine, Hershey, PA, USA
| | - Shantu Amin
- Department of Pharmacology, Penn State Hershey College of Medicine, Hershey, PA, USA
| | - Mark Kester
- University of Virginia Cancer Center, University of Virginia, Charlottesville, VA, USA
| | - Thomas P Loughran
- University of Virginia Cancer Center, University of Virginia, Charlottesville, VA, USA
| | - Robert F Paulson
- Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, PA, USA
| | - David F Claxton
- Department of Hematology, Penn State Hershey Cancer Institute, Hershey, PA, USA
| | - Hong-Gang Wang
- Department of Pediatrics, Penn State Hershey College of Medicine, Hershey, PA, USA
| | - Jong K Yun
- Department of Pharmacology, Penn State Hershey College of Medicine, Hershey, PA, USA.,The Jake Gittlen Laboratories for Cancer Research, The Pennsylvania State University College of Medicine, Hershey, PA, USA
| |
Collapse
|
22
|
Hegde S, Cancelas JA. Dissecting the metabolic pathways controlling platelet survival in vivo: are our platelets what they eat? Transfusion 2016; 56:1928-31. [PMID: 27500916 DOI: 10.1111/trf.13684] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2016] [Accepted: 05/09/2016] [Indexed: 11/28/2022]
Affiliation(s)
- Shailaja Hegde
- Hoxworth Blood Center, University of Cincinnati College of Medicine.,Division of Experimental Hematology, Cincinnati Children's Research Foundation, Cincinnati Children's Hospital Medical Center, Cincinnati, OH
| | - Jose A Cancelas
- Hoxworth Blood Center, University of Cincinnati College of Medicine.,Division of Experimental Hematology, Cincinnati Children's Research Foundation, Cincinnati Children's Hospital Medical Center, Cincinnati, OH
| |
Collapse
|
23
|
Openshaw JJ, Hegde S, Sazzad HMS, Khan SU, Hossain MJ, Epstein JH, Daszak P, Gurley ES, Luby SP. Bat Hunting and Bat-Human Interactions in Bangladeshi Villages: Implications for Zoonotic Disease Transmission and Bat Conservation. Transbound Emerg Dis 2016; 64:1287-1293. [PMID: 27125493 PMCID: PMC5086320 DOI: 10.1111/tbed.12505] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [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: 02/11/2016] [Indexed: 01/03/2023]
Abstract
Bats are an important reservoir for emerging zoonotic pathogens. Close human–bat interactions, including the sharing of living spaces and hunting and butchering of bats for food and medicines, may lead to spillover of zoonotic disease into human populations. We used bat exposure and environmental data gathered from 207 Bangladeshi villages to characterize bat exposures and hunting in Bangladesh. Eleven percent of households reported having a bat roost near their homes, 65% reported seeing bats flying over their households at dusk, and 31% reported seeing bats inside their compounds or courtyard areas. Twenty percent of households reported that members had at least daily exposure to bats. Bat hunting occurred in 49% of the villages surveyed and was more likely to occur in households that reported nearby bat roosts (adjusted prevalence ratio [aPR] 2.3, 95% CI 1.1–4.9) and villages located in north‐west (aPR 7.5, 95% CI 2.5–23.0) and south‐west (aPR 6.8, 95% CI 2.1–21.6) regions. Our results suggest high exposure to bats and widespread hunting throughout Bangladesh. This has implications for both zoonotic disease spillover and bat conservation.
Collapse
Affiliation(s)
- J J Openshaw
- Infectious Diseases and Geographic Medicine, Stanford University, Stanford, CA, USA
| | - S Hegde
- International Centre for Diarrheal Diseases, Bangladesh, Dhaka, Bangladesh
| | - H M S Sazzad
- International Centre for Diarrheal Diseases, Bangladesh, Dhaka, Bangladesh
| | - S U Khan
- International Centre for Diarrheal Diseases, Bangladesh, Dhaka, Bangladesh
| | - M J Hossain
- International Centre for Diarrheal Diseases, Bangladesh, Dhaka, Bangladesh
| | | | - P Daszak
- EcoHealth Alliance, New York, NY, USA
| | - E S Gurley
- International Centre for Diarrheal Diseases, Bangladesh, Dhaka, Bangladesh
| | - S P Luby
- Infectious Diseases and Geographic Medicine, Stanford University, Stanford, CA, USA.,International Centre for Diarrheal Diseases, Bangladesh, Dhaka, Bangladesh
| |
Collapse
|
24
|
|
25
|
Hegde S, Jain M, Shubha AB. A Rare Bilateral Presentation of Multiple Dens Invaginatus, Shovel-Shaped Incisor and Talon Cusp With Mesiodens. ACTA ACUST UNITED AC 2015; 12:292-5. [DOI: 10.3126/kumj.v12i4.13737] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The aim of this paper is to describe a unique and unusual case of concomitant appearance of morphological dental anomalies in the maxillary anterior region, along with its management in a patient with no systemic abnormality. This case report describes the clinical and radiographic features of talon cusp, dens invaginatus, shovel-shaped incisors and a supernumerary tooth occurring in a single patient, which is a rare presentation. All 4 permanent maxillary incisors had dens invaginatus, the permanent maxillary canines showed the presence of talon cusps, the permanent maxillary central incisors were shovel-shaped and an erupted mesiodens was also observed. Treatment included restorative, surgical and orthodontic approaches.Kathmandu University Medical Journal Vol.12(4) 2014; 292-295
Collapse
|
26
|
Hall DP, Cost NG, Hegde S, Kellner E, Mikhaylova O, Stratton Y, Ehmer B, Abplanalp WA, Pandey R, Biesiada J, Harteneck C, Plas DR, Meller J, Czyzyk-Krzeska MF. TRPM3 and miR-204 establish a regulatory circuit that controls oncogenic autophagy in clear cell renal cell carcinoma. Cancer Cell 2014; 26:738-53. [PMID: 25517751 PMCID: PMC4269832 DOI: 10.1016/j.ccell.2014.09.015] [Citation(s) in RCA: 139] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Revised: 08/06/2014] [Accepted: 09/25/2014] [Indexed: 12/14/2022]
Abstract
Autophagy promotes tumor growth by generating nutrients from the degradation of intracellular structures. Here we establish, using shRNAs, a dominant-negative mutant, and a pharmacologic inhibitor, mefenamic acid (MFA), that the Transient Receptor Potential Melastatin 3 (TRPM3) channel promotes the growth of clear cell renal cell carcinoma (ccRCC) and stimulates MAP1LC3A (LC3A) and MAP1LC3B (LC3B) autophagy. Increased expression of TRPM3 in RCC leads to Ca(2+) influx, activation of CAMKK2, AMPK, and ULK1, and phagophore formation. In addition, TRPM3 Ca(2+) and Zn(2+) fluxes inhibit miR-214, which directly targets LC3A and LC3B. The von Hippel-Lindau tumor suppressor (VHL) represses TRPM3 directly through miR-204 and indirectly through another miR-204 target, Caveolin 1 (CAV1).
Collapse
Affiliation(s)
- Daniel P Hall
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0521, USA
| | - Nicholas G Cost
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0521, USA; Division of Pediatric Urology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Shailaja Hegde
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0521, USA
| | - Emily Kellner
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0521, USA
| | - Olga Mikhaylova
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0521, USA
| | - Yiwen Stratton
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0521, USA
| | - Birgit Ehmer
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0521, USA
| | - William A Abplanalp
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0521, USA
| | - Raghav Pandey
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0521, USA
| | - Jacek Biesiada
- Division of Biomedical Informatics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Christian Harteneck
- Department of Pharmacology and Experimental Therapy, Institute of Experimental and Clinical Pharmacology and Toxicology, Eberhard Karls University Hospitals and Clinics, and Interfaculty Center of Pharmacogenomics and Drug Research, University of Tübingen, 72074 Tübingen, Germany
| | - David R Plas
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0521, USA
| | - Jarek Meller
- Department of Environmental Health, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0056, USA; Division of Biomedical Informatics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA; Department of Informatics, Nicolas Copernicus University, 87-100 Torun, Poland
| | - Maria F Czyzyk-Krzeska
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0521, USA; Department of Veterans Affairs, VA Research Service, Cincinnati, OH 45220, USA.
| |
Collapse
|
27
|
Manoor Maiya V, Vaid N, Basu S, Vatyam S, Hegde S, Deshmukh S, Zade B. The Use of Xylitol for the Prevention of Xerostomia in Patients Receiving Intensity Modulated Radiation Therapy for Head and Neck Cancers. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.1700] [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: 10/24/2022]
|
28
|
Sullivan JA, Jankowska-Gan E, Shi L, Roenneburg D, Hegde S, Greenspan DS, Wilkes DS, Denlinger LC, Burlingham WJ. Differential requirement for P2X7R function in IL-17 dependent vs. IL-17 independent cellular immune responses. Am J Transplant 2014; 14:1512-22. [PMID: 24866539 PMCID: PMC4295495 DOI: 10.1111/ajt.12741] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [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: 01/03/2014] [Revised: 02/24/2014] [Accepted: 03/10/2014] [Indexed: 01/25/2023]
Abstract
IL17-dependent autoimmunity to collagen type V (Col V) has been associated with lung transplant obliterative bronchiolitis. Unlike the T helper 1 (Th1)-dependent immune responses to Tetanus Toxoid (TT), the Th17 response to Col V in lung transplant patients and its Th1/17 variant observed in coronary artery disease patients requires IL-1β, tumor necrosis factor α and CD14(+) cells. Given the involvement of the P2X7 receptor (P2X7R) in monocyte IL-1β responses, we investigated its role in Th17-, Th1/17- and Th1-mediated proinflammatory responses. Transfer of antigen-pulsed peripheral blood mononucleated cells (PBMCs) from Col V-reactive patients into SCID mouse footpads along with P2X7R antagonists revealed a selective inhibition of Col V-, but not TT-specific swelling responses. P2X7R inhibitors blocked IL-1β induction from monocytes, including both Col V-α1 peptide-induced (T-dependent), as well as native Col V-induced (T-independent) responses. Significantly higher P2X7R expression was found on CXCR3(neg) CCR4(+)/6(+) CD4(+) [Th17] versus CXCR3(+)CCR4/6(neg) CD4(+) [Th1] subsets in PBMCs, suggesting that the paradigm of selective dependence on P2X7R might extend beyond Col V autoimmunity. Indeed, P2X7R inhibitors suppressed not only anti-Col V, but also Th1/17-mediated alloimmunity, in a heart transplant patient without affecting anti-viral Epstein-Barr virus responses. These results suggest that agents targeting the P2X7R might effectively treat Th17-related transplant pathologies, while maintaining Th1-immunity to infection.
Collapse
Affiliation(s)
- JA Sullivan
- Department of Surgery, University of Wisconsin, 600 Highland Avenue, Madison, WI 53792
| | - E Jankowska-Gan
- Department of Surgery, University of Wisconsin, 600 Highland Avenue, Madison, WI 53792
| | - L Shi
- Department of Medicine, University of Wisconsin, 600 Highland Avenue, Madison, WI 53792
| | - D Roenneburg
- Department of Surgery, University of Wisconsin, 600 Highland Avenue, Madison, WI 53792
| | | | - DS Greenspan
- Department of Cell & Regenerative Biology, University of Wisconsin, 600 Highland Avenue, Madison, WI 53792
| | - DS Wilkes
- Department of Medicine, University of Indiana, 340 W 10th St Suite 6200 Indianapolis, IN 46202
| | - LC Denlinger
- Department of Medicine, University of Wisconsin, 600 Highland Avenue, Madison, WI 53792
| | - WJ Burlingham
- Department of Surgery, University of Wisconsin, 600 Highland Avenue, Madison, WI 53792,To whom correspondence should be addressed: 600 Highland Avenue, Room G4/702, Madison, WI 53792. Tel: (608) 263-0119 Fax: (608) 262-6280
| |
Collapse
|
29
|
Gandhi UH, Kaushal N, Hegde S, Finch ER, Kudva AK, Kennett MJ, Jordan CT, Paulson RF, Prabhu KS. Selenium suppresses leukemia through the action of endogenous eicosanoids. Cancer Res 2014; 74:3890-901. [PMID: 24872387 DOI: 10.1158/0008-5472.can-13-3694] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Eradicating cancer stem-like cells (CSC) may be essential to fully eradicate cancer. Metabolic changes in CSC could hold a key to their targeting. Here, we report that the dietary micronutrient selenium can trigger apoptosis of CSC derived from chronic or acute myelogenous leukemias when administered at supraphysiologic but nontoxic doses. In leukemia CSC, selenium treatment activated ATM-p53-dependent apoptosis accompanied by increased intracellular levels of reactive oxygen species. Importantly, the same treatment did not trigger apoptosis in hematopoietic stem cells. Serial transplantation studies with BCR-ABL-expressing CSC revealed that the selenium status in mice was a key determinant of CSC survival. Selenium action relied upon the endogenous production of the cyclooxygenase-derived prostaglandins Δ(12)-PGJ2 and 15d-PGJ2. Accordingly, nonsteroidal anti-inflammatory drugs and NADPH oxidase inhibitors abrogated the ability of selenium to trigger apoptosis in leukemia CSC. Our results reveal how selenium-dependent modulation of arachidonic acid metabolism can be directed to trigger apoptosis of primary human and murine CSC in leukemia.
Collapse
Affiliation(s)
- Ujjawal H Gandhi
- Authors' Affiliations: Department of Veterinary and Biomedical Sciences, Center for Molecular Immunology and Infectious Disease and Center for Molecular Toxicology and Carcinogenesis, The Pennsylvania State University, University Park, Pennsylvania; and
| | - Naveen Kaushal
- Authors' Affiliations: Department of Veterinary and Biomedical Sciences, Center for Molecular Immunology and Infectious Disease and Center for Molecular Toxicology and Carcinogenesis, The Pennsylvania State University, University Park, Pennsylvania; and
| | - Shailaja Hegde
- Authors' Affiliations: Department of Veterinary and Biomedical Sciences, Center for Molecular Immunology and Infectious Disease and Center for Molecular Toxicology and Carcinogenesis, The Pennsylvania State University, University Park, Pennsylvania; and
| | - Emily R Finch
- Authors' Affiliations: Department of Veterinary and Biomedical Sciences, Center for Molecular Immunology and Infectious Disease and Center for Molecular Toxicology and Carcinogenesis, The Pennsylvania State University, University Park, Pennsylvania; and
| | - Avinash K Kudva
- Authors' Affiliations: Department of Veterinary and Biomedical Sciences, Center for Molecular Immunology and Infectious Disease and Center for Molecular Toxicology and Carcinogenesis, The Pennsylvania State University, University Park, Pennsylvania; and
| | - Mary J Kennett
- Authors' Affiliations: Department of Veterinary and Biomedical Sciences, Center for Molecular Immunology and Infectious Disease and Center for Molecular Toxicology and Carcinogenesis, The Pennsylvania State University, University Park, Pennsylvania; and
| | - Craig T Jordan
- Division of Hematology, Hematologic Malignancies, and Stem Cell Transplantation, University of Colorado, Anshutz Medical Campus, Aurora, Colorado
| | - Robert F Paulson
- Authors' Affiliations: Department of Veterinary and Biomedical Sciences, Center for Molecular Immunology and Infectious Disease and Center for Molecular Toxicology and Carcinogenesis, The Pennsylvania State University, University Park, Pennsylvania; and
| | - K Sandeep Prabhu
- Authors' Affiliations: Department of Veterinary and Biomedical Sciences, Center for Molecular Immunology and Infectious Disease and Center for Molecular Toxicology and Carcinogenesis, The Pennsylvania State University, University Park, Pennsylvania; and
| |
Collapse
|
30
|
Finch E, Kaushal N, Kudva A, Gandhi U, Hegde S, Whelan J, Paulson R, Prabhu KS. The effect of high dietary eicosapentaenoic acid supplementation in leukemic mice. FASEB J 2013. [DOI: 10.1096/fasebj.27.1_supplement.637.22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Emily Finch
- Department of Veterinary and Biomedical SciencesThe Pennsylvania State UniversityUniverisity ParkPA
| | - Naveen Kaushal
- Department of Veterinary and Biomedical SciencesThe Pennsylvania State UniversityUniverisity ParkPA
| | - Avinash Kudva
- Department of Veterinary and Biomedical SciencesThe Pennsylvania State UniversityUniverisity ParkPA
| | - Ujjawal Gandhi
- Department of Veterinary and Biomedical SciencesThe Pennsylvania State UniversityUniverisity ParkPA
| | - Shailaja Hegde
- Department of Veterinary and Biomedical SciencesThe Pennsylvania State UniversityUniverisity ParkPA
| | - Jay Whelan
- Department of NutritionThe Univerity of Tennessee KnoxvilleKnoxvilleTN
| | - Robert Paulson
- Department of Veterinary and Biomedical SciencesThe Pennsylvania State UniversityUniverisity ParkPA
| | - K. Sandeep Prabhu
- Department of Veterinary and Biomedical SciencesThe Pennsylvania State UniversityUniverisity ParkPA
| |
Collapse
|
31
|
Bennett C, Gangadhar B, Hegde S, Kashyap H, Keshav Kumar J, Mukundan C, Nehra A, Raguram A, Rajakumari K, Rajeswaran J, Rao S, Sadana D, Sadasivan A, Shereena E, Sudhir P, Thomas S. List of contributors. Neuropsychol Rehabil 2013. [DOI: 10.1016/b978-0-12-416046-0.00013-4] [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: 11/17/2022]
|
32
|
Sen P, Bhuwanesh K, Ashutosh K, Engineer Z, Hegde S, Sen P, Lal R. Micro-Scale Multi-Effect Distillation System for Low Steam Inputs. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.proeng.2013.03.089] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
33
|
|
34
|
Unnikrishnan B, Jagannath V, Ramapuram JT, Hegde S. Study of depression and its associated factors among women living with HIV AIDS in coastal South India. Retrovirology 2012. [PMCID: PMC3360354 DOI: 10.1186/1742-4690-9-s1-p137] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
35
|
Hegde S, Hankey P, Paulson RF. Self-renewal of leukemia stem cells in Friend virus-induced erythroleukemia requires proviral insertional activation of Spi1 and hedgehog signaling but not mutation of p53. Stem Cells 2012; 30:121-30. [PMID: 22083997 DOI: 10.1002/stem.781] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Friend virus induces erythroleukemia through a characteristic two-stage progression. The prevailing model proposes that during the initial, polyclonal stage of disease most of the infected cells terminally differentiate, resulting in acute erythrocytosis. In the late stage of disease, a clonal leukemia develops through the acquisition of new mutations--proviral insertional activation of Spi1/Pu.1 and mutation of p53. Previous work from our laboratory demonstrated that Friend virus activates the bone morphogenic protein 4 (BMP4)-dependent stress erythropoiesis pathway, which leads to the rapid expansion of stress erythroid progenitors, which are the targets for Friend virus in the spleen. We recently showed that stress erythroid progenitors have intrinsic self-renewal ability and therefore could function as leukemia stem cells (LSCs) when infected with Friend virus. Here, we show that the two stages of Friend virus-induced disease are caused by infection of distinct stress progenitor populations in the spleen. The development of leukemia relies on the ability of the virus to hijack the intrinsic self-renewal capability of stress erythroid progenitors leading to the generation of LSCs. Two signals are required for the self-renewal of Friend virus LSCs proviral insertional activation of Spi1/Pu.1 and Hedgehog-dependent signaling. Surprisingly, mutation of p53 is not observed in LSCs. These data establish a new model for Friend virus-induced erythroleukemia and demonstrate the utility of Friend virus as a model system to study LSC self-renewal.
Collapse
Affiliation(s)
- Shailaja Hegde
- Department of Veterinary and Biomedical Sciences, Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | | | | |
Collapse
|
36
|
Gandhi UH, Kaushal N, Ravindra KC, Hegde S, Nelson SM, Narayan V, Vunta H, Paulson RF, Prabhu KS. Selenoprotein-dependent up-regulation of hematopoietic prostaglandin D2 synthase in macrophages is mediated through the activation of peroxisome proliferator-activated receptor (PPAR) gamma. J Biol Chem 2011; 286:27471-82. [PMID: 21669866 DOI: 10.1074/jbc.m111.260547] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
The plasticity of macrophages is evident from their dual role in inflammation and resolution of inflammation that are accompanied by changes in the transcriptome and metabolome. Along these lines, we have previously demonstrated that the micronutrient selenium increases macrophage production of arachidonic acid (AA)-derived anti-inflammatory 15-deoxy-Δ(12,14)-prostaglandin J(2) (15d-PGJ(2)) and decreases the proinflammatory PGE(2). Here, we hypothesized that selenium modulated the metabolism of AA by a differential regulation of various prostaglandin (PG) synthases favoring the production of PGD(2) metabolites, Δ(12)-PGJ(2) and 15d-PGJ(2). A dose-dependent increase in the expression of hematopoietic-PGD(2) synthase (H-PGDS) by selenium and a corresponding increase in Δ(12)-PGJ(2) and 15d-PGJ(2) in RAW264.7 macrophages and primary bone marrow-derived macrophages was observed. Studies with organic non-bioavailable forms of selenium and the genetic manipulation of cellular selenium incorporation machinery indicated that selenoproteins were necessary for H-PGDS expression and 15d-PGJ(2) production. Treatment of selenium-deficient macrophages with rosiglitazone, a peroxisome proliferator-activated receptor γ ligand, up-regulated H-PGDS. Furthermore, electrophoretic mobility shift assays indicated the presence of an active peroxisome proliferator-activated receptor-response element in murine Hpgds promoter suggesting a positive feedback mechanism of H-PGDS expression. Alternatively, the expression of nuclear factor-κB-dependent thromboxane synthase and microsomal PGE(2) synthase was down-regulated by selenium. Using a Friend virus infection model of murine leukemia, the onset of leukemia was observed only in selenium-deficient and indomethacin-treated selenium-supplemented mice but not in the selenium-supplemented group or those treated with 15d-PGJ(2). These results suggest the importance of selenium in the shunting of AA metabolism toward the production of PGD(2) metabolites, which may have clinical implications.
Collapse
Affiliation(s)
- Ujjawal H Gandhi
- Graduate Program in Molecular Toxicology, Center for Molecular Immunology and Infectious Disease, Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
37
|
Abstract
Redox modulation by antioxidants, such as selenium (Se), has emerged as an important regulator of erythropoiesis. Using Se-deficient (0.04 ppm), Se-adequate (0.1 ppm), and Se-supplemented (0.4 ppm) C57/BL6 mice, we show that Se deficiency caused anemia, when compared to the Se-supplemented and Se-adequate groups. Increased denaturation of hemoglobin, methemoglobin, protein carbonyls, lipid peroxidation, Heinz bodies, and osmotic fragility of erythrocytes were observed in Se-deficient mice. Increased oxidative stress upregulated forkhead transcription factor (FoxO3a) and hypoxia-inducible factor-(HIF)1α in the spleen and kidney of Se-deficient murine as well as in the proerythroblast G1E cells cultured in Se-deficient media. A significant increase in the expression of erythropoietin, a downstream target of HIF1α, and expansion of stress erythroid progenitors (burst forming units-erythroid) were seen in the Se-deficient mice. Despite the increase in erythroid progenitors, lowered reticulocytes suggest a defective erythroid differentiation pathway. While Se deficiency led to increased nuclear levels of active FoxO3a, Se-adequate conditions reversed this effect and increased nuclear export by its binding partner, 14-3-3βζ, that is under the redox control of selenoproteins. In summary, these results provide insight into the importance of adequate Se nutrition in regulating red cell homeostasis by mitigating oxidative stress-dependent modulation of FoxO3a and HIF1α to effect differentiation of erythroid progenitors.
Collapse
Affiliation(s)
- Naveen Kaushal
- Department of Veterinary and Biomedical Sciences, Center for Molecular Immunology and Infectious Disease, The Pennsylvania State University, University Park, PA 16802, USA
| | | | | | | | | |
Collapse
|
38
|
Hegde S, Bajaj A, Entwisle J. Incidence of thrombosis in lung cancer. Lung Cancer 2008. [DOI: 10.1016/s0169-5002(08)70014-x] [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: 11/30/2022]
|
39
|
Abstract
Congenital alveolar dysplasia (CAD) is a rare disorder thought to represent alveolar growth arrest at the canalicular stage of development. An infant with CAD diagnosed on lung biopsy is reported, her respiratory problems resolved spontaneously and she was doing well at follow-up. The infant additionally suffered from systemic hypertension and hypertrophic pyloric stenosis. In conclusion, we speculate that the association of CAD with systemic hypertension and hypertrophic pyloric stenosis might be explained by abnormalities of isoforms of nitric oxide synthase (NOS) resulting in congenital deformities involving smooth muscles.
Collapse
Affiliation(s)
- S Hegde
- Division of Asthma, Allergy and Lung Biology, King's College London School of Medicine at Guy's, King's College and St. Thomas' Hospitals, London, UK
| | | | | | | |
Collapse
|
40
|
Paulson RF, Perry J, Harandi O, Porayette P, Hegde S, Wu DC, Shi L. BMP4-dependent signals regulate the expansion of a specialized population of erythroid progenitors during times of erythropoietic stress. Blood Cells Mol Dis 2007. [DOI: 10.1016/j.bcmd.2006.10.110] [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: 10/23/2022]
|
41
|
Subramanian A, Hegde S, Correll PH, Paulson RF. Mutation of the Lyn tyrosine kinase delays the progression of Friend virus induced erythroleukemia without affecting susceptibility. Leuk Res 2006; 30:1141-9. [PMID: 16527351 DOI: 10.1016/j.leukres.2006.02.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [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: 09/08/2005] [Revised: 01/24/2006] [Accepted: 02/03/2006] [Indexed: 11/29/2022]
Abstract
During the initial phase of Friend virus (FV) induced erythroleukemia, the interaction between the viral envelope glycoprotein gp55, the Erythropoietin receptor (EpoR) and the naturally occurring truncated version of the Mst1r receptor tyrosine kinase, called Sf-Stk, drives the polyclonal expansion of infected progenitors in an erythropoietin independent manner. Sf-Stk provides signals that cooperate with EpoR signals to effect expansion of erythroid progenitors. The latter phase of disease is characterized by a clonal expansion of transformed leukemic cells causing an acute erythroleukemia in mice. Signaling by Sf-Stk and EpoR mediated by gp55 renders erythroid progenitors Epo independent through the activation of the EpoR downstream pathways such as PI3K, MAPK and JAK/STAT. Previous work has shown that Src family kinases also play an important role in erythropoiesis. In particular, mutation of Src and Lyn can affect erythropoiesis. In this report we analyze the role of the Lyn tyrosine kinase in the pathogenesis of Friend virus. We demonstrate that during FV infection of primary erythroblasts, Lyn is not required for expansion of viral targets. Lyn deficient bone marrow and spleen cells are able to form Epo independent FV colonies in vitro. In vivo infection of Lyn deficient animals also results in a massive splenomegaly characteristic of the virus. However, we observe differences in the pathogenesis of Friend erythroleukemia in Lyn-/- mice. Lyn-/- mice infected with the polycythemia inducing strain of FV, FVP, do not develop polycythemia suggesting that Lyn-/- infected erythroblasts have a defect in terminal differentiation. Furthermore, the expansion of transformed cells in the spleen is reduced in Lyn-/- mice. Our data show that Lyn signals are not required for susceptibility to Friend erythroleukemia, but Lyn plays a role in later events, the terminal differentiation of infected cells and the expansion of transformed cells.
Collapse
MESH Headings
- Animals
- Bone Marrow/enzymology
- Bone Marrow/virology
- Cell Differentiation/genetics
- Cell Transformation, Viral/genetics
- Erythroid Precursor Cells/metabolism
- Erythroid Precursor Cells/virology
- Friend murine leukemia virus
- Leukemia, Erythroblastic, Acute/enzymology
- Leukemia, Erythroblastic, Acute/genetics
- Leukemia, Erythroblastic, Acute/virology
- Leukemia, Experimental/enzymology
- Leukemia, Experimental/genetics
- MAP Kinase Signaling System/genetics
- Mice
- Mice, Knockout
- Mutation
- Phosphotransferases/genetics
- Phosphotransferases/metabolism
- Receptors, Erythropoietin/metabolism
- Retroviridae Infections/enzymology
- Retroviridae Infections/genetics
- Spleen/enzymology
- Spleen/virology
- Tumor Virus Infections/enzymology
- Tumor Virus Infections/genetics
- Viral Envelope Proteins/metabolism
- src-Family Kinases/genetics
Collapse
Affiliation(s)
- Aparna Subramanian
- Graduate Program in Biochemistry, Microbiology and Molecular Biology, The Pennsylvania State University, University Park, PA 16802, USA
| | | | | | | |
Collapse
|
42
|
Miquel ME, Rhode KS, Acher PL, Macdougall ND, Blackall J, Gaston RP, Hegde S, Morris SL, Beaney R, Deehan C, Popert R, Keevil SF. Using combined x-ray and MR imaging for prostate I-125 post-implant dosimetry: phantom validation and preliminary patient work. Phys Med Biol 2006; 51:1129-37. [PMID: 16481682 DOI: 10.1088/0031-9155/51/5/005] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Post-implantation dosimetry is an important element of permanent prostate brachytherapy. This process relies on accurate localization of implanted seeds relative to the surrounding organs. Localization is commonly achieved using CT images, which provide suboptimal prostate delineation. On MR images, conversely, prostate visualization is excellent but seed localization is imprecise due to distortion and susceptibility artefacts. This paper presents a method based on fused MR and x-ray images acquired consecutively in a combined x-ray and MRI interventional suite. The method does not rely on any explicit registration step but on a combination of system calibration and tracking. A purpose-built phantom was imaged using MRI and x-rays, and the images were successfully registered. The same protocol was applied to three patients where combining soft tissue information from MRI with stereoscopic seed identification from x-ray imaging facilitated post-implant dosimetry. This technique has the potential to improve on dosimetry using either CT or MR alone.
Collapse
Affiliation(s)
- M E Miquel
- Division of Imaging Sciences, King's College London, London, SE1 9RT, UK
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
43
|
Sermesant M, Rhode K, Sanchez-Ortiz GI, Camara O, Andriantsimiavona R, Hegde S, Rueckert D, Lambiase P, Bucknall C, Rosenthal E, Delingette H, Hill DLG, Ayache N, Razavi R. Simulation of cardiac pathologies using an electromechanical biventricular model and XMR interventional imaging. Med Image Anal 2005; 9:467-80. [PMID: 16006170 DOI: 10.1016/j.media.2005.05.003] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Simulating cardiac electromechanical activity is of great interest for a better understanding of pathologies and for therapy planning. Design and validation of such models is difficult due to the lack of clinical data. XMR systems are a new type of interventional facility in which patients can be rapidly transferred between X-ray and MR systems. Our goal is to design and validate an electromechanical model of the myocardium using XMR imaging. The proposed model is computationally fast and uses clinically observable parameters. We present the integration of anatomy, electrophysiology, and motion from patient data. Pathologies are introduced in the model and simulations are compared to measured data. Initial qualitative comparison on the two clinical cases presented is encouraging. Once fully validated, these models will make it possible to simulate different interventional strategies.
Collapse
Affiliation(s)
- M Sermesant
- Cardiac MR Research Group, King's College London, 5th Floor Thomas Guy House, Guy's Hospital, London, UK.
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
44
|
Lambiase PD, Hegde S, Sermesant M, Rhode KS, Hill DL, Razavi R, Gill JS. Integrated X-ray & Magnetic Resonance imaging (XMR) -a novel strategy for guiding pulmonary vein ablation. Heart Rhythm 2005. [DOI: 10.1016/j.hrthm.2005.02.859] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
45
|
Hegde S, Paulson RF. Co-targeting a selectable marker to the Escherichia coli chromosome improves the recovery rate for mutations induced in BAC clones by homologous recombination. Biotechniques 2005; 36:936-8, 940. [PMID: 15211742 DOI: 10.2144/04366bm03] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [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: 11/23/2022] Open
|
46
|
Williams MR, Hegde S, Norton MR. Informed consent and surgeons in training: do patients consent to allow surgical trainees to operate on them? Ann R Coll Surg Engl 2005; 86:465-6. [PMID: 15527593 PMCID: PMC1964262 DOI: 10.1308/1478708041127] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Affiliation(s)
- M R Williams
- Department of Trauma and Orthopaedics, Royal Cornwall Hospitals NHS Trust, Treliske, Truro, Cornwall, UK
| | | | | |
Collapse
|
47
|
Affiliation(s)
- N E Moghal
- Department of Paediatric Nephrology, Royal Victoria Infirmary, Newcastle upon Tyne NE1 4LP, UK.
| | | | | |
Collapse
|
48
|
Hegde S, Coulthard MG. End stage renal disease due to bilateral renal malakoplakia. Arch Dis Child 2004; 89:78-9. [PMID: 14709516 PMCID: PMC1755936] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/03/2023]
Abstract
Malakoplakia typically affects the bladders of immunocompromised adults who have defective intracellular killing of Escherichia coli. Renal malakoplakia is rare in children and generally has a good outcome. In the case presented, however, it caused end stage renal failure in a 5 year old girl. The management dilemmas surrounding renal transplantation are highlighted.
Collapse
Affiliation(s)
- S Hegde
- Department of Paediatric Nephrology, Royal Victoria Infirmary, Newcastle, UK
| | | |
Collapse
|
49
|
Li K, Menon MP, Karur VG, Hegde S, Wojchowski DM. Attenuated signaling by a phosphotyrosine-null Epo receptor form in primary erythroid progenitor cells. Blood 2003; 102:3147-53. [PMID: 12869513 DOI: 10.1182/blood-2003-01-0078] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [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] [Indexed: 12/16/2022] Open
Abstract
Signals provided by the erythropoieitin receptor (EpoR) are required for erythroid development beyond the erythroid colony-forming unit (CFU-e) stage and are propagated via the EpoR-tethered Janus kinase, JAK2. JAK2 functions, in part, to phosphorylate 8 conserved EpoR phosphotyrosine (PY) sites for the binding of a diverse set of signaling factors. However, recent studies in transgenic and knock-in mice have demonstrated substantial bioactivity for PY-null EpoR forms. Presently, the activities of a PY-null EpoR-HM form in primary progenitor cells from knock-in mice were further assessed using optimized Epo dose-dependent proliferation, survival, and differentiation assays. As compared with the wild-type (wt)-EpoR, EpoR-HM activity was compromised several-fold in each context when Epo was limited to physiologic concentrations. Possible compensatory increases in serum growth factor levels also were investigated, and as assayed using embryonic stem (ES) cell-derived erythroid G1E2 cells, activities in serum from EpoR-HM mice were substantially elevated. In addition, when challenged with phenylhydrazine-induced anemia, EpoR-HM mice failed to respond with efficient splenic stress erythropoiesis. Thus, the function of this JAK2-coupled but minimal PY-null EpoR-HM form appears to be attenuated in several contexts and to be assisted in vivo by compensatory mechanisms. Roles normally played by EpoR PY sites and distal domains therefore should receive continued attention.
Collapse
Affiliation(s)
- Ke Li
- Immunobiology Program and Department of Veterinary Science, The Pennsylvania State University, University Park, PA 16802, USA
| | | | | | | | | |
Collapse
|
50
|
Vetting M, Roderick SL, Hegde S, Magnet S, Blanchard JS. What can structure tell us about in vivo function? The case of aminoglycoside-resistance genes. Biochem Soc Trans 2003; 31:520-2. [PMID: 12773148 DOI: 10.1042/bst0310520] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Resistance to antibiotics used in the treatment of bacterial infections is an expanding clinical problem. Aminoglycosides, one of the oldest classes of natural product antibiotics, exert their bactericidal effect as the result of inhibiting bacterial protein synthesis by binding to the acceptor site of the 30 S ribosomal subunit. The most common mechanism of clinical resistance to aminoglycosides results from the expression of enzymes that covalently modify the aminoglycoside. We will discuss the enzymology and structure of two representative chromosomally encoded aminoglycoside N-acetyltransferases, Mycobacterium tuberculosis AAC(2')-Ic and Salmonella enterica AAC(6')-Iy, and speculate about their possible physiological function and substrates.
Collapse
Affiliation(s)
- M Vetting
- Department of Biochemistry, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA
| | | | | | | | | |
Collapse
|