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Jia J, Arif A, Willard B, Smith JD, Stuehr DJ, Hazen SL, Fox PL. Protection of Extraribosomal RPL13a by GAPDH and Dysregulation by S-Nitrosylation. Mol Cell 2023; 83:3941. [PMID: 37922873 PMCID: PMC10699088 DOI: 10.1016/j.molcel.2023.10.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2023]
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2
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Greenberg J, Desai M, Kulshrestha K, Guzman-Gomez A, Hogue S, Arif A, Ahmed H, Morales D, Zafar F. Can Comparative Outcomes Following Solid Organ Transplantation Serve as a Launchpad for Value-Based Research Funding? J Heart Lung Transplant 2023. [DOI: 10.1016/j.healun.2023.02.660] [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: 04/05/2023] Open
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3
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Arif A. Distribution of Suicides in India: A Decadal Data Analysis (2011-2020). Eur J Public Health 2022. [PMCID: PMC9594371 DOI: 10.1093/eurpub/ckac131.502] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Background India accounts for a significant proportion of suicide deaths globally. As per the Global Burden of Disease Study, India’s share of global suicides from 1990 to 2016 increased from 25·3% to 36·6% among women and 18·7% to 24·3% among men. However, medical factors are not the sole contributors to the suicide burden. Methods I analyze decadal data (2011-2020) on suicides in India provided by National Crime Records Bureau. This data contains the distribution of suicidal deaths based on age groups, causes, professions, gender, and residence zones. Results The analysis suggests that individuals aged ‘15-29 years’ were most affected (35.05%) by suicides, followed by those aged ‘30-44 years’ (32.61%). Family problems contribute to the highest burden of suicides among both these age groups. Such deaths can be attributed to personal reasons. Suicides due to dowry disputes are exclusive to women. Also, women report the highest instances of suicides due to marriage-related issues. While suicides due to drug abuse, bankruptcy, unemployment, poverty, and property disputes were mainly reported among males. In 2020, the rise in annual suicide rate was found to be highest among business persons (29.43%), especially tradesmen (49.9%) and vendors (26.11%) against other businesses (12.13%). Other professions which witnessed a steep rise in annual suicide rates in 2020 were agricultural laborers (17.90%) and daily wage earners (15.76%). This increase in suicide rates may be linked to economic reasons post lockdown imposition during the Covid-19 outbreak in 2020. Conclusions Women commit suicide mainly due to marriage-related causes, while men are more vulnerable to suicide due to economic factors. Not all suicides can be traced back to diagnosed mental illnesses. A significant proportion of suicides are attributed to personal, economic, and social problems. The insights generated from this analysis can help identify the vulnerable groups and target the much-needed interventions. Key messages • Suicide is a multifaceted problem involving various personal, economic, cultural, and social factors, besides medical reasons. • Multidimensional strategies targeted at vulnerable groups could be potentially effective in curbing suicide rate.
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Affiliation(s)
- A Arif
- IIM Ahmedabad Public Policy, , Ahmedabad, India
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4
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Sefiane K, Duursma G, Arif A. Patterns from dried drops as a characterisation and healthcare diagnosis technique, potential and challenges: A review. Adv Colloid Interface Sci 2021; 298:102546. [PMID: 34717206 DOI: 10.1016/j.cis.2021.102546] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Revised: 10/06/2021] [Accepted: 10/08/2021] [Indexed: 10/20/2022]
Abstract
When particulate-laden droplets evaporate, they leave behind complex patterns on the substrate depending on their composition and the dynamics of their evaporation. Over the past two decades, there has been an increased interest in interpreting these patterns due to their numerous applications in biomedicine, forensics, food quality analysis and inkjet printing. The objective of this review is to investigate the use of patterns from dried drops as a characterisation and diagnosis technique. The patterns left behind by dried drops of various complex fluids are categorised. The potential applications of these patterns are presented, focussing primarily on healthcare, where the future impact could be greatest. A discussion on the limitations which must be overcome and prospective works that may be carried out to allow for widespread implementation of this technique is presented in conclusion.
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5
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Reidelbach C, Garcia-Käufer M, Wingert N, Arif A, Vach K, Hellwig E, Gminski R, Polydorou O. Cytotoxicity and estrogenicity in simulated dental wastewater after grinding of resin-based materials. Dent Mater 2021; 37:1486-1497. [PMID: 34376295 DOI: 10.1016/j.dental.2021.07.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 08/24/2020] [Revised: 06/02/2021] [Accepted: 07/22/2021] [Indexed: 10/20/2022]
Abstract
OBJECTIVE This study evaluated the cytotoxic and estrogenic effects of dust and eluates released into simulated wastewater after grinding of dental resin-based materials. METHODS Four materials were used: ceram.x® universal, Filtek™ Supreme XTE, Lava™ Ultimate and Core-X™ flow. From each composite material, samples (5 × 2 mm, n = 50) were prepared according to the manufacturers' instructions. Lava™ Ultimate was used as blocks. All samples were ground to dust with a diamond bur (106 μm) and suspended in distilled water at 60 mg/mL. After storage for 72 h, the suspensions were separated into a soluble (eluate) and a particulate (dust) fraction. Eluates and dusts were evaluated for inhibition of Vibrio fischeri bioluminescence and cytotoxicity on human A549 lung cells (WST-1-Assay). The estrogenic activity was assessed by YES-Assay using Saccharomyces cerevisiae. Additionally, dental monomers (BisGMA, BisEMA, UDMA, TEGDMA, HEMA) and Bisphenol A were investigated. RESULTS All eluates showed inhibition of V. fischeri bioluminescence at concentrations above 1.1 mg/mL (p < 0.05). The activity of the eluates of ceram.x® universal and Filtek™ Supreme XTE was significantly higher than Lava™ Ultimate and Core-X™ flow (p < 0.05). In the WST-1-Assay, all materials induced cytotoxic effects at concentrations of 0.1 mg/mL (p < 0.05), while no significant differences were detected among them. The tested materials revealed no estrogenic activity. All dental monomers and Bisphenol A showed concentration dependent cytotoxic effects (p < 0.05), whereas only Bisphenol A induced an estrogenic effect (p < 0.01). SIGNIFICANCE Dust and eluates of resin-based dental materials released into wastewater exert bactericidal and cytotoxic effects in vitro. However, they reveal no estrogenic effect.
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Affiliation(s)
- C Reidelbach
- Department of Operative Dentistry and Periodontology, Center for Dental Medicine, Faculty of Medicine, Medical Center - University of Freiburg, Hugstetter Straße 55, 79106, Freiburg, Germany.
| | - M Garcia-Käufer
- Institute for Infection Prevention and Hospital Epidemiology, Faculty of Medicine, Medical Center - University of Freiburg, Breisacher Straße 115b, 79106 Freiburg, Germany
| | - N Wingert
- Institute for Infection Prevention and Hospital Epidemiology, Faculty of Medicine, Medical Center - University of Freiburg, Breisacher Straße 115b, 79106 Freiburg, Germany
| | - A Arif
- Institute for Infection Prevention and Hospital Epidemiology, Faculty of Medicine, Medical Center - University of Freiburg, Breisacher Straße 115b, 79106 Freiburg, Germany
| | - K Vach
- Institute for Medical Biometry and Statistics, Faculty of Medicine, Medical Center - University of Freiburg, Stefan-Meier-Straße 26, 79104 Freiburg, Germany
| | - E Hellwig
- Department of Operative Dentistry and Periodontology, Center for Dental Medicine, Faculty of Medicine, Medical Center - University of Freiburg, Hugstetter Straße 55, 79106, Freiburg, Germany
| | - R Gminski
- Institute for Infection Prevention and Hospital Epidemiology, Faculty of Medicine, Medical Center - University of Freiburg, Breisacher Straße 115b, 79106 Freiburg, Germany
| | - O Polydorou
- Department of Operative Dentistry and Periodontology, Center for Dental Medicine, Faculty of Medicine, Medical Center - University of Freiburg, Hugstetter Straße 55, 79106, Freiburg, Germany
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Marshall A, Young A, Levine M, Hill C, Hale D, Thirlwall J, Wilkie V, French K, Kakkar A, Lokare A, Maraveyas A, Chapman O, Arif A, Petrou S, Maredza M, Hobbs F, Dunn J. PO-36 Treatment of cancer-associated venous thromboembolism: 12-month outcomes of the placebo versus rivaroxaban randomisation of the SELECT-D trial. Thromb Res 2021. [DOI: 10.1016/s0049-3848(21)00209-7] [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: 11/16/2022]
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Abstract
INTRODUCTION Aerosol-generating procedures (AGPs) put the dental health care professionals (DHCPs) at a greater risk for acquiring severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. In late June 2020, the Centers for Disease Control and Prevention advised elective dental procedures provision to asymptomatic patients while mandating strict infection control protocol and suggested the use of preprocedural testing as an adjunct. A cost-effective method for mass preprocedural testing is pool testing, which has specificity and sensitivity similar to polymerase chain reaction. This article aims to assess the outcomes and utility of incorporating preprocedural testing protocol for SARS-CoV-2 in dental clinics before providing AGPs. METHOD The patients who were recommended AGPs where rubber dam placement was not possible were advised to undergo preprocedural testing for SARS-CoV-2. Pool testing strategy was employed, and patients were asked to get tested 48 h before the day of the procedure. RESULTS Out of a total of 1,000 patients, who presented from June 2020 to late July 2020, 464 were recommended dental procedures. In 194 of 464, AGPs could not be performed under rubber dam isolation; therefore, the patients were advised to get a preprocedural pool test. In total, 111 patients deferred the procedure and testing. Out of 83 who got tested, 7 were positive for SARS-CoV-2, 5 of whom were tested in early June 2020 and 2 in late July 2020. CONCLUSION Pool testing within its limitations can be a useful preprocedure test in asymptomatic low-risk patients for AGP in dentistry, especially when the disease prevalence is low or moderate (<10%). It has the potential of reducing testing costs significantly while conserving reagent and other resources. Preprocedure testing, however, also gives rise to certain ethical concerns that also need to be addressed. KNOWLEDGE TRANSFER STATEMENT The results of this study can be used by clinicians when deciding which preprocedure testing approach they wish to use when performing aerosol-generating procedures in asymptomatic patients with consideration of cost sensitivity and specificity values.
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Affiliation(s)
- F. Umer
- Department of Surgery, Aga Khan University Hospital, Karachi, Pakistan
| | - A. Arif
- Department of Surgery, Aga Khan University Hospital, Karachi, Pakistan
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Merchant A, Arif A, Ahmad S, Fatimi S. SPONTANEOUS RUPTURE OF ASPERGILLOMA LEADING TO LOCULATED PNEUMOTHORAX. Chest 2020. [DOI: 10.1016/j.chest.2020.05.120] [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: 11/26/2022] Open
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9
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Roberts JL, Liu G, Paglia DN, Kinter CW, Fernandes LM, Lorenzo J, Hansen MF, Arif A, Drissi H. Deletion of
Wnt5a
in osteoclasts results in bone loss through decreased bone formation. Ann N Y Acad Sci 2020; 1463:45-59. [DOI: 10.1111/nyas.14293] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Revised: 11/25/2019] [Accepted: 12/04/2019] [Indexed: 12/29/2022]
Affiliation(s)
- Joseph L. Roberts
- Department of Orthopaedics Emory University School of Medicine Atlanta Georgia
| | - Guanglu Liu
- Department of Orthopaedics Emory University School of Medicine Atlanta Georgia
| | - David N. Paglia
- Department of Orthopaedics, New Jersey Medical School Rutgers University Newark New Jersey
| | | | | | - Joseph Lorenzo
- Department of Medicine and Department of Orthopaedic Surgery University of Connecticut Health Farmington Connecticut
| | - Marc F. Hansen
- Center for Molecular Medicine University of Connecticut Health Farmington Connecticut
| | - Abul Arif
- Department of Orthopaedics Emory University School of Medicine Atlanta Georgia
| | - Hicham Drissi
- Department of Orthopaedics Emory University School of Medicine Atlanta Georgia
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Arif A, Muin M, Larekeng SH, Lestari PI. Survey and morphological identification of termites (Insecta: Isoptera) in Teaching Forest of Hasanuddin University, Indonesia. ACTA ACUST UNITED AC 2019. [DOI: 10.1088/1755-1315/270/1/012001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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11
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Arif A, Jia J, Willard B, Li X, Fox PL. Multisite Phosphorylation of S6K1 Directs a Kinase Phospho-code that Determines Substrate Selection. Mol Cell 2019; 73:446-457.e6. [PMID: 30612880 PMCID: PMC6415305 DOI: 10.1016/j.molcel.2018.11.017] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [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: 05/21/2018] [Revised: 10/16/2018] [Accepted: 11/15/2018] [Indexed: 01/02/2023]
Abstract
Multisite phosphorylation of kinases can induce on-off or graded regulation of catalytic activity; however, its influence on substrate specificity remains unclear. Here, we show that multisite phosphorylation of ribosomal protein S6 kinase 1 (S6K1) alters target selection. Agonist-inducible phosphorylation of glutamyl-prolyl tRNA synthetase (EPRS) by S6K1 in monocytes and adipocytes requires not only canonical phosphorylation at Thr389 by mTORC1 but also phosphorylation at Ser424 and Ser429 in the C terminus by cyclin-dependent kinase 5 (Cdk5). S6K1 phosphorylation at these additional sites induces a conformational switch and is essential for high-affinity binding and phosphorylation of EPRS, but not canonical S6K1 targets, e.g., ribosomal protein S6. Unbiased proteomic analysis identified additional targets phosphorylated by multisite phosphorylated S6K1 in insulin-stimulated adipocytes-namely, coenzyme A synthase, lipocalin 2, and cortactin. Thus, embedded within S6K1 is a target-selective kinase phospho-code that integrates signals from mTORC1 and Cdk5 to direct an insulin-stimulated, post-translational metabolon determining adipocyte lipid metabolism.
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Affiliation(s)
- Abul Arif
- Department of Cardiovascular and Metabolic Sciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA; Department of Orthopedics, Emory University School of Medicine, Atlanta, GA 30322, USA.
| | - Jie Jia
- Department of Cardiovascular and Metabolic Sciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Belinda Willard
- Lerner Research Institute Proteomics and Metabolomics Core, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, OH 44195, USA
| | - Xiaoxia Li
- Department of Inflammation and Immunity, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Paul L Fox
- Department of Cardiovascular and Metabolic Sciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA.
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12
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Gruffi TR, Peralta FM, Thakkar MS, Arif A, Anderson RF, Orlando B, Coffman JC, Nathan N, McCarthy RJ, Toledo P, Habib AS. Anesthetic management of parturients with Arnold Chiari malformation-I: a multicenter retrospective study. Int J Obstet Anesth 2018; 37:52-56. [PMID: 30414718 DOI: 10.1016/j.ijoa.2018.10.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 09/18/2018] [Accepted: 10/04/2018] [Indexed: 10/28/2022]
Abstract
BACKGROUND Consensus regarding the safest mode of delivery and anesthetic management for parturients with Arnold Chiari malformation-I (ACM-I) remains controversial. This study assessed their anesthetic management and reported anesthetic complications during hospitalization for delivery. METHODS This was a multicenter, retrospective, cohort study of patients with ACM-I undergoing vaginal or cesarean delivery. Data were obtained from the electronic databases of four United States academic institutions using International Classification of Diseases (ICD) codes from 2007-2017 at three sites and 2004-2017 at one site. The primary outcome was anesthetic complications. RESULTS Data were analyzed for 185 deliveries in 148 patients. Diagnosis of ACM-I was made prior to delivery in 147 (80%) cases. Pre-delivery neurosurgical consultation for management of ACM-I was performed in 53 (36%) patients. Pre-existing symptoms were recorded for 89 (48%) of the deliveries. Vaginal deliveries occurred in 80 (43%) cases, and 62 women (78%) received neuraxial labor analgesia. Cesarean delivery was performed in 105 (57%) cases, of which 70 women (67%) had neuraxial anesthesia and 34 (32%) received general anesthesia. Post-dural puncture headache was reported in three (2%) patients who had neuraxial anesthesia, and in two (12%) patients with syringomyelia. There was one (3%) reported case of aspiration pneumonia with general anesthesia. CONCLUSIONS The findings suggest that anesthetic complications occur infrequently in patients with ACM-I regardless of the anesthetic management. Although institutional preference in anesthetic and obstetric care appears to drive patient management, the findings suggest that an individualized approach has favorable outcomes in this population.
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Affiliation(s)
- T R Gruffi
- Department of Anesthesiology, Northwestern University Feinberg School of Medicine, Chicago, IL, United States
| | - F M Peralta
- Department of Anesthesiology, Northwestern University Feinberg School of Medicine, Chicago, IL, United States.
| | - M S Thakkar
- Department of Anesthesiology, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - A Arif
- Department of Anesthesiology, Icahn School of Medicine, Mount Sinai West Hospital, New York, NY, United States
| | - R F Anderson
- Department of Anesthesiology, Duke University Hospital, Durham, NC, United States
| | - B Orlando
- Department of Anesthesiology, Icahn School of Medicine, Mount Sinai West Hospital, New York, NY, United States
| | - J C Coffman
- Department of Anesthesiology, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - N Nathan
- Department of Anesthesiology, Northwestern University Feinberg School of Medicine, Chicago, IL, United States
| | - R J McCarthy
- Department of Anesthesiology, Rush University Medical Center, Chicago, IL, United States
| | - P Toledo
- Department of Anesthesiology, Northwestern University Feinberg School of Medicine, Chicago, IL, United States
| | - A S Habib
- Department of Anesthesiology, Duke University Hospital, Durham, NC, United States
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13
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Halawani D, Gogonea V, DiDonato JA, Pipich V, Yao P, China A, Topbas C, Vasu K, Arif A, Hazen SL, Fox PL. Structural control of caspase-generated glutamyl-tRNA synthetase by appended noncatalytic WHEP domains. J Biol Chem 2018; 293:8843-8860. [PMID: 29643180 DOI: 10.1074/jbc.m117.807503] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Revised: 03/26/2018] [Indexed: 02/02/2023] Open
Abstract
Aminoacyl-tRNA synthetases are ubiquitous, evolutionarily conserved enzymes catalyzing the conjugation of amino acids onto cognate tRNAs. During eukaryotic evolution, tRNA synthetases have been the targets of persistent structural modifications. These modifications can be additive, as in the evolutionary acquisition of noncatalytic domains, or subtractive, as in the generation of truncated variants through regulated mechanisms such as proteolytic processing, alternative splicing, or coding region polyadenylation. A unique variant is the human glutamyl-prolyl-tRNA synthetase (EPRS) consisting of two fused synthetases joined by a linker containing three copies of the WHEP domain (termed by its presence in tryptophanyl-, histidyl-, and glutamyl-prolyl-tRNA synthetases). Here, we identify site-selective proteolysis as a mechanism that severs the linkage between the EPRS synthetases in vitro and in vivo Caspase action targeted Asp-929 in the third WHEP domain, thereby separating the two synthetases. Using a neoepitope antibody directed against the newly exposed C terminus, we demonstrate EPRS cleavage at Asp-929 in vitro and in vivo Biochemical and biophysical characterizations of the N-terminally generated EPRS proteoform containing the glutamyl-tRNA synthetase and most of the linker, including two WHEP domains, combined with structural analysis by small-angle neutron scattering, revealed a role for the WHEP domains in modulating conformations of the catalytic core and GSH-S-transferase-C-terminal-like (GST-C) domain. WHEP-driven conformational rearrangement altered GST-C domain interactions and conferred distinct oligomeric states in solution. Collectively, our results reveal long-range conformational changes imposed by the WHEP domains and illustrate how noncatalytic domains can modulate the global structure of tRNA synthetases in complex eukaryotic systems.
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Affiliation(s)
- Dalia Halawani
- From the Department of Cellular and Molecular Medicine, Lerner Research Institute and
| | - Valentin Gogonea
- From the Department of Cellular and Molecular Medicine, Lerner Research Institute and .,the Department of Chemistry, Cleveland State University, Cleveland, Ohio 44115
| | - Joseph A DiDonato
- From the Department of Cellular and Molecular Medicine, Lerner Research Institute and
| | - Vitaliy Pipich
- the Jülich Center for Neutron Science, Outstation at Maier-Leibnitz Zentrum, Forschungszentrum Jülich, GmbH, Lichtenbergstrasse 1, 85747 Garching, Germany, and
| | - Peng Yao
- the Department of Medicine, Aab Cardiovascular Research Institute, University of Rochester, Rochester, New York 14642
| | - Arnab China
- From the Department of Cellular and Molecular Medicine, Lerner Research Institute and
| | - Celalettin Topbas
- From the Department of Cellular and Molecular Medicine, Lerner Research Institute and.,the Department of Chemistry, Cleveland State University, Cleveland, Ohio 44115
| | - Kommireddy Vasu
- From the Department of Cellular and Molecular Medicine, Lerner Research Institute and
| | - Abul Arif
- From the Department of Cellular and Molecular Medicine, Lerner Research Institute and
| | - Stanley L Hazen
- From the Department of Cellular and Molecular Medicine, Lerner Research Institute and.,Center for Cardiovascular Diagnostics and Prevention, and Department of Cardiovascular Medicine, Cleveland Clinic Foundation, Cleveland, Ohio 44195
| | - Paul L Fox
- From the Department of Cellular and Molecular Medicine, Lerner Research Institute and
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Tahas SA, Hetzel U, Altenbrunner-Martinek B, Martin Jurado O, Hammer S, Arif A, Hatt JM, Clauss M. Microanatomy of the digestive tract, hooves and some visceral organs of addax antelope (Addax nasomaculatus) following a concentrate or forage feeding regime. Anat Histol Embryol 2018. [PMID: 29520834 DOI: 10.1111/ahe.12351] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Subacute ruminal acidosis is a common disease in captive non-domesticated ruminants and is mainly diagnosed by rumen fluid pH and rumen histology. Furthermore, differences in ruminant gastrointestinal histology have been hypothesized to correlate with the browser-grazer continuum. Twelve surplus addax antelope (Addax nasomaculatus) were divided into two groups, fed either their usual diet, consisting of a concentrate feed with a limited amount of hay, or a diet of unlimited hay only, for 3 months. After culling, descriptive and morphometric histology and pH measurements were compared between groups. Significant variations in cellular subpopulations were noted between groups, with roughage-fed individuals presenting primarily with balloon cells of the Stratum corneum and living layer cell vacuolization, whereas parakeratosis and intermediate-type cells were more frequent in the concentrate-fed group. Lesions typical of subacute ruminal acidosis were significantly more pronounced in concentrate-fed individuals. Ruminal pH measurements did not differ significantly, but were more consistent in forage-fed individuals, indicating a more stable reticuloruminal environment. The results indicate that ruminal histology may be more appropriate in assessing ruminal health compared to a single post-mortem pH measurement. It is proposed that Stratum corneum balloon cells may indicate cell maturation and not, as previously assumed, hyperfunction. Concentrate-fed individuals scored higher on the presence of inflammatory cells on hoof corium histology. The study further emphasizes the adaptability of ruminant digestive tract microanatomy in adult animals even after a short period of time and the positive effects an increased roughage diet may have in populations of captive grazing ruminants.
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Affiliation(s)
- S A Tahas
- Clinic for Zoo Animals, Exotic Pets and Wildlife, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - U Hetzel
- Institute of Veterinary Pathology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | | | - O Martin Jurado
- Clinic for Zoo Animals, Exotic Pets and Wildlife, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - S Hammer
- Al Wabra Wildlife Preservation, Doha, Qatar
| | - A Arif
- Al Wabra Wildlife Preservation, Doha, Qatar
| | - J-M Hatt
- Clinic for Zoo Animals, Exotic Pets and Wildlife, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - M Clauss
- Clinic for Zoo Animals, Exotic Pets and Wildlife, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
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15
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Almeida R, Arif A, Cheung A. A192 PRIMARY SCLEROSING CHOLANGITIS WITH CHOLELITHIASIS IS A DISTINCT PHENOTYPE WITH WORSE SYMPTOMS, DECOMPENSATION-FREE & TRANSPLANT-FREE SURVIVAL. J Can Assoc Gastroenterol 2018. [DOI: 10.1093/jcag/gwy008.193] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- R Almeida
- Gastroenterology, University of Toronto, Toronto, ON, Canada
| | - A Arif
- University of Toronto, Toronto, ON, Canada
| | - A Cheung
- University of Toronto, Toronto, ON, Canada
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16
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Abidin R, Ahamat M, Arif A, Ahmad T, Murad M. Investigation on spring characteristics for small arms. J Fundam and Appl Sci 2018. [DOI: 10.4314/jfas.v9i3s.28] [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] Open
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17
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Affiliation(s)
- Abul Arif
- a Department of Cellular and Molecular Medicine , Lerner Research Institute, Cleveland Clinic , Cleveland , OH , USA
| | - Paul L Fox
- a Department of Cellular and Molecular Medicine , Lerner Research Institute, Cleveland Clinic , Cleveland , OH , USA
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18
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Arif A, Yao P, Terenzi F, Jia J, Ray PS, Fox PL. The GAIT translational control system. Wiley Interdiscip Rev RNA 2017; 9. [PMID: 29152905 PMCID: PMC5815886 DOI: 10.1002/wrna.1441] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Revised: 07/12/2017] [Accepted: 07/31/2017] [Indexed: 01/19/2023]
Abstract
The interferon (IFN)‐γ‐activated inhibitor of translation (GAIT) system directs transcript‐selective translational control of functionally related genes. In myeloid cells, IFN‐γ induces formation of a multiprotein GAIT complex that binds structural GAIT elements in the 3′‐untranslated regions (UTRs) of multiple inflammation‐related mRNAs, including ceruloplasmin and VEGF‐A, and represses their translation. The human GAIT complex is a heterotetramer containing glutamyl‐prolyl tRNA synthetase (EPRS), NS1‐associated protein 1 (NSAP1), ribosomal protein L13a (L13a), and glyceraldehyde‐3‐phosphate dehydrogenase (GAPDH). A network of IFN‐γ‐stimulated kinases regulates recruitment and assembly of GAIT complex constituents. Activation of cyclin‐dependent kinase 5 (Cdk5), mammalian target of rapamycin complex 1 (mTORC1), and S6K1 kinases induces EPRS release from its parental multiaminoacyl tRNA synthetase complex to join NSAP1 in a ‘pre‐GAIT’ complex. Subsequently, the DAPK‐ZIPK kinase axis phosphorylates L13a, inducing release from the 60S ribosomal subunit and binding to GAPDH. The subcomplexes join to form the functional GAIT complex. Each constituent has a distinct role in the GAIT system. EPRS binds the GAIT element in target mRNAs, NSAP1 negatively regulates mRNA binding, L13a binds eIF4G to block ribosome recruitment, and GAPDH shields L13a from proteasomal degradation. The GAIT system is susceptible to genetic and condition‐specific regulation. An N‐terminus EPRS truncate is a dominant‐negative inhibitor ensuring a ‘translational trickle’ of target transcripts. Also, hypoxia and oxidatively modified lipoproteins regulate GAIT activity. Mouse models exhibiting absent or genetically modified GAIT complex constituents are beginning to elucidate the physiological role of the GAIT system, particularly in the resolution of chronic inflammation. Finally, GAIT‐like systems in proto‐chordates suggests an evolutionarily conserved role of the pathway in innate immunity. WIREs RNA 2018, 9:e1441. doi: 10.1002/wrna.1441 This article is categorized under:
Translation > Translation Regulation RNA Interactions with Proteins and Other Molecules > RNA–Protein Complexes Regulatory RNAs/RNAi/Riboswitches > Riboswitches
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Affiliation(s)
- Abul Arif
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Peng Yao
- Aab Cardiovascular Research Institute, University of Rochester School of Medicine & Dentistry, Rochester, NY, USA
| | - Fulvia Terenzi
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Jie Jia
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Partho Sarothi Ray
- Department of Biological Sciences, Indian Institute of Science Education and Research, Kolkata, India
| | - Paul L Fox
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
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Aziz-ur-Rehman, Arif A, Abbasi MA, Siddiqui SZ, Rasool S, Shah SAA. Synthesis and pharmacological screening: Sulfa derivatives of 2-pipecoline-bearing 1,3,4-oxadiazole core. Russ J Bioorg Chem 2017. [DOI: 10.1134/s1068162017030025] [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] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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20
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Tahas SA, Martin Jurado O, Hammer S, Arif A, Reese S, Hatt JM, Clauss M. Gross Measurements of the Digestive Tract and Visceral Organs of Addax Antelope (Addax nasomaculatus
) Following a Concentrate or Forage Feeding Regime. Anat Histol Embryol 2017; 46:282-293. [DOI: 10.1111/ahe.12268] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Accepted: 02/04/2017] [Indexed: 11/28/2022]
Affiliation(s)
- S. A. Tahas
- Clinic for Zoo Animals, Exotic Pets and Wildlife; Vetsuisse Faculty; University of Zurich; 8057 Zurich Switzerland
| | - O. Martin Jurado
- Clinic for Zoo Animals, Exotic Pets and Wildlife; Vetsuisse Faculty; University of Zurich; 8057 Zurich Switzerland
| | - S. Hammer
- Al Wabra Wildlife Preservation; P.O. Box 44069 Doha Qatar
| | - A. Arif
- Al Wabra Wildlife Preservation; P.O. Box 44069 Doha Qatar
| | - S. Reese
- Institute of Veterinary Anatomy, Histology and Embryology; Veterinary Faculty; LMU Munich; Veterinärstr. 13 80539 Munich Germany
| | - J.-M. Hatt
- Clinic for Zoo Animals, Exotic Pets and Wildlife; Vetsuisse Faculty; University of Zurich; 8057 Zurich Switzerland
| | - M. Clauss
- Clinic for Zoo Animals, Exotic Pets and Wildlife; Vetsuisse Faculty; University of Zurich; 8057 Zurich Switzerland
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21
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Arif A, Terenzi F, Potdar AA, Jia J, Sacks J, China A, Halawani D, Vasu K, Li X, Brown JM, Chen J, Kozma SC, Thomas G, Fox PL. EPRS is a critical mTORC1-S6K1 effector that influences adiposity in mice. Nature 2017; 542:357-361. [PMID: 28178239 PMCID: PMC5480610 DOI: 10.1038/nature21380] [Citation(s) in RCA: 101] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Accepted: 01/11/2017] [Indexed: 12/26/2022]
Abstract
Metabolic pathways that contribute to adiposity and ageing are activated by the mammalian target of rapamycin complex 1 (mTORC1) and p70 ribosomal protein S6 kinase 1 (S6K1) axis. However, known mTORC1-S6K1 targets do not account for observed loss-of-function phenotypes, suggesting that there are additional downstream effectors of this pathway. Here we identify glutamyl-prolyl-tRNA synthetase (EPRS) as an mTORC1-S6K1 target that contributes to adiposity and ageing. Phosphorylation of EPRS at Ser999 by mTORC1-S6K1 induces its release from the aminoacyl tRNA multisynthetase complex, which is required for execution of noncanonical functions of EPRS beyond protein synthesis. To investigate the physiological function of EPRS phosphorylation, we generated Eprs knock-in mice bearing phospho-deficient Ser999-to-Ala (S999A) and phospho-mimetic (S999D) mutations. Homozygous S999A mice exhibited low body weight, reduced adipose tissue mass, and increased lifespan, similar to S6K1-deficient mice and mice with adipocyte-specific deficiency of raptor, an mTORC1 constituent. Substitution of the EprsS999D allele in S6K1-deficient mice normalized body mass and adiposity, indicating that EPRS phosphorylation mediates S6K1-dependent metabolic responses. In adipocytes, insulin stimulated S6K1-dependent EPRS phosphorylation and release from the multisynthetase complex. Interaction screening revealed that phospho-EPRS binds SLC27A1 (that is, fatty acid transport protein 1, FATP1), inducing its translocation to the plasma membrane and long-chain fatty acid uptake. Thus, EPRS and FATP1 are terminal mTORC1-S6K1 axis effectors that are critical for metabolic phenotypes.
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Affiliation(s)
- Abul Arif
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio 44195, USA
| | - Fulvia Terenzi
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio 44195, USA
| | - Alka A Potdar
- F. Widjaja Foundation Inflammatory Bowel and Immunobiology Research Institute, Cedars-Sinai Medical Center, Los Angeles, California 90048, USA
| | - Jie Jia
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio 44195, USA
| | - Jessica Sacks
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio 44195, USA
| | - Arnab China
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio 44195, USA
| | - Dalia Halawani
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio 44195, USA
| | - Kommireddy Vasu
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio 44195, USA
| | - Xiaoxia Li
- Department of Immunology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio 44195, USA
| | - J Mark Brown
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio 44195, USA
| | - Jie Chen
- Department of Cell and Developmental Biology, University of Illinois, Urbana, Illinois 61801, USA
| | - Sara C Kozma
- Catalan Institute of Oncology, ICO, Bellvitge Biomedical Research Institute, IDIBELL, Barcelona, Spain.,Department of Physiological Sciences II, Faculty of Medicine, University of Barcelona, 08908 Barcelona, Spain
| | - George Thomas
- Catalan Institute of Oncology, ICO, Bellvitge Biomedical Research Institute, IDIBELL, Barcelona, Spain.,Department of Physiological Sciences II, Faculty of Medicine, University of Barcelona, 08908 Barcelona, Spain.,Division of Hematology and Oncology, Department of Internal Medicine, College of Medicine, University of Cincinnati, Cincinnati, Ohio, USA
| | - Paul L Fox
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio 44195, USA
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Body J, Terpos E, Tombal B, Hadji P, Arif A, Young A, Aapro M, Coleman R. Bone health in the elderly cancer patient: A SIOG position paper. Cancer Treat Rev 2016; 51:46-53. [DOI: 10.1016/j.ctrv.2016.10.004] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Accepted: 10/19/2016] [Indexed: 01/13/2023]
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Arif A, Jia J, Halawani D, Fox PL. Experimental approaches for investigation of aminoacyl tRNA synthetase phosphorylation. Methods 2016; 113:72-82. [PMID: 27729295 DOI: 10.1016/j.ymeth.2016.10.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Revised: 10/04/2016] [Accepted: 10/06/2016] [Indexed: 02/04/2023] Open
Abstract
Phosphorylation of many aminoacyl tRNA synthetases (AARSs) has been recognized for decades, but the contribution of post-translational modification to their primary role in tRNA charging and decryption of genetic code remains unclear. In contrast, phosphorylation is essential for performance of diverse noncanonical functions of AARSs unrelated to protein synthesis. Phosphorylation of glutamyl-prolyl tRNA synthetase (EPRS) has been investigated extensively in our laboratory for more than a decade, and has served as an archetype for studies of other AARSs. EPRS is a constituent of the IFN-γ-activated inhibitor of translation (GAIT) complex that directs transcript-selective translational control in myeloid cells. Stimulus-dependent phosphorylation of EPRS is essential for its release from the parental multi-aminoacyl tRNA synthetase complex (MSC), for binding to other GAIT complex proteins, and for regulating the binding to target mRNAs. Importantly, phosphorylation is the common driving force for the context- and stimulus-dependent release, and non-canonical activity, of other AARSs residing in the MSC, for example, lysyl tRNA synthetase (KARS). Here, we describe the concepts and experimental methodologies we have used to investigate the influence of phosphorylation on the structure and function of EPRS. We suggest that application of these approaches will help to identify new functional phosphorylation event(s) in other AARSs and elucidate their possible roles in noncanonical activities.
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Affiliation(s)
- Abul Arif
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Jie Jia
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Dalia Halawani
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Paul L Fox
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA.
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Rashid M, Yousaf Z, Haider MS, Khalid S, Rehman HA, Younas A, Arif A. Genetic diversity of functional food species Spinacia oleracea L. by protein markers. Nat Prod Res 2014; 28:782-7. [PMID: 24499432 DOI: 10.1080/14786419.2014.881359] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Exploration of genetic diversity contributes primarily towards crop improvement. Spinaciaoleracea L. is a functional food species but unfortunately the genetic diversity of this vegetable is still unexplored. Therefore, this research was planned to explore the genetic diversity of S. oleracea by using morphological and protein markers. Protein profile of 25 accessions was generated on sodium dodecyl sulphate polyacrylamide gel. Total allelic variation of 27 bands was found. Out of these, 20 were polymorphic and the rest of the bands were monomorphic. Molecular weights of the bands ranged from 12.6 to 91.2 kDa. Major genetic differences were observed in accession 20541 (Peshawar) followed by 20180 (Lahore) and 19902 (AVRDC). Significant differences exist in the protein banding pattern. This variation can further be studied by advanced molecular techniques, including two-dimensional electrophoresis and DNA markers.
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Affiliation(s)
- M Rashid
- a Department of Botany , Lahore College for Women University , Jail Road, Lahore , Pakistan
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Jia J, Yao P, Arif A, Fox PL. Regulation and dysregulation of 3'UTR-mediated translational control. Curr Opin Genet Dev 2013; 23:29-34. [PMID: 23312843 DOI: 10.1016/j.gde.2012.12.004] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2012] [Revised: 11/29/2012] [Accepted: 12/12/2012] [Indexed: 10/27/2022]
Abstract
Translational control provides numerous advantages in regulation of gene expression including rapid responsiveness, intracellular localization, nondestruction of template mRNA, and coordinated regulation of transcript ensembles. Transcript-selective, translational control is driven by the specific interaction of factor(s) with the 5' or 3' untranslated region (UTR), thereby influencing initiation, elongation, or termination of mRNA translation. The mean length of human 3'UTRs is greater than that of 5'UTR, indicating the expanded potential for motifs, structural elements, and binding sites for trans-acting factors that exert transcript-selective translation control. New and unexpected mechanisms of 3'UTR-mediated translational control and their contributions to disease have received increasing attention during the last decade. Here, we briefly review a few recent and representative discoveries of 3'UTR-mediated translational control, emphasizing the novel aspects of these regulatory mechanisms and their potential pathophysiological significance.
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Affiliation(s)
- Jie Jia
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Avenue/NC10, Cleveland, OH 44195, USA
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26
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Jia J, Arif A, Stuehr DJ, Hazen SL, Fox PL. Protection of extraribosomal RPL13a by GAPDH and dysregulation by S-nitrosylation. Mol Cell 2012; 47:656-63. [PMID: 22771119 PMCID: PMC3635105 DOI: 10.1016/j.molcel.2012.06.006] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [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: 04/06/2012] [Revised: 05/03/2012] [Accepted: 05/21/2012] [Indexed: 11/26/2022]
Abstract
Multiple eukaryotic ribosomal proteins (RPs) are co-opted for extraribosomal "moonlighting" activities, but paradoxically, RPs exhibit rapid turnover when not ribosome-bound. In one illustrative case of a functional extraribosomal RP, interferon (IFN)-γ induces ribosome release of L13a and assembly into the IFN-gamma-activated inhibitor of translation (GAIT) complex for translational control of a subset of inflammation-related proteins. Here we show GAPDH functions as a chaperone, shielding newly released L13a from proteasomal degradation. However, GAPDH protective activity is lost following cell treatment with oxidatively modified low density lipoprotein and IFN-γ. These agonists stimulate S-nitrosylation at Cys(247) of GAPDH, which fails to interact with L13a, causing proteasomal degradation of essentially the entire cell complement of L13a and defective translational control. Evolution of extraribosomal RP activities might require coevolution of protective chaperones, and pathological disruption of either protein, or their interaction, presents an alternative mechanism of diseases due to RP defects, and targets for therapeutic intervention.
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Affiliation(s)
- Jie Jia
- Department of Cell Biology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Abul Arif
- Department of Cell Biology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Dennis J. Stuehr
- Department of Pathobiology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Stanley L. Hazen
- Department of Cell Biology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Paul L. Fox
- Department of Cell Biology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
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Arif A. Extraneuronal activities and regulatory mechanisms of the atypical cyclin-dependent kinase Cdk5. Biochem Pharmacol 2012; 84:985-93. [PMID: 22795893 DOI: 10.1016/j.bcp.2012.06.027] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2012] [Revised: 06/26/2012] [Accepted: 06/27/2012] [Indexed: 12/13/2022]
Abstract
Cyclin-dependent kinase, Cdk5, is an atypical but essential member of the Cdk family of proline-directed serine/threonine kinases with no evident role in cell cycle progression. Cdk5 is present in post-mitotic and terminally differentiated neuronal/glial cells and is also known to arrest cell cycle. Also atypical is the activation of Cdk5 by binding of a non-cyclin activator protein, namely, the Cdk5 regulatory proteins Cdk5R1 (p35), truncated Cdk5R1 (p25), or Cdk5R2 (p39). Despite its ubiquitous presence in all cells and tissues, Cdk5 is often referred to as a neuron-specific kinase largely due to the abundant presence of the activator proteins in neuronal cells. Recently, this concept of a canonical neuronal function of Cdk5 has been extended, if not challenged, by the observation of p35 and p39 expression, as well as Cdk5 activity, in multiple non-neuronal cells. Extraneuronal Cdk5 regulates critical biological processes including transcript-selective translation control for regulation of macrophage gene expression, glucose-inducible insulin secretion, hematopoietic cell differentiation, vascular angiogenesis, cell migration, senescence, and wound-healing, among others. Recent advances in the extraneuronal functions of Cdk5 are reviewed and discussed here in the context of their physiological activities and pathophysiological implications with some speculative comments on the endogenous control mechanisms that might "turn on" Cdk5 activity. The potential importance of targeted inhibition of Cdk5 as therapeutic agents against glucotoxicity, diabetes, cardiovascular diseases, and cancer is also discussed.
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Affiliation(s)
- Abul Arif
- Department of Cell Biology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA.
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28
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Yao P, Potdar AA, Arif A, Ray PS, Mukhopadhyay R, Willard B, Xu Y, Yan J, Saidel GM, Fox PL. Coding region polyadenylation generates a truncated tRNA synthetase that counters translation repression. Cell 2012; 149:88-100. [PMID: 22386318 DOI: 10.1016/j.cell.2012.02.018] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2011] [Revised: 10/29/2011] [Accepted: 02/09/2012] [Indexed: 12/21/2022]
Abstract
Posttranscriptional regulatory mechanisms superimpose "fine-tuning" control upon "on-off" switches characteristic of gene transcription. We have exploited computational modeling with experimental validation to resolve an anomalous relationship between mRNA expression and protein synthesis. The GAIT (gamma-interferon-activated inhibitor of translation) complex repressed VEGF-A synthesis to a low, constant rate independent of VEGF-A mRNA expression levels. Dynamic model simulations predicted an inhibitory GAIT-element-interacting factor to account for this relationship and led to the identification of a truncated form of glutamyl-prolyl tRNA synthetase (EPRS), a GAIT constituent that mediates binding to target transcripts. The truncated protein, EPRS(N1), shields GAIT-element-bearing transcripts from the inhibitory GAIT complex, thereby dictating a "translational trickle" of GAIT target proteins. EPRS(N1) mRNA is generated by polyadenylation-directed conversion of a Tyr codon in the EPRS-coding sequence to a stop codon (PAY(∗)). Genome-wide analysis revealed multiple candidate PAY(∗) targets, including the authenticated target RRM1, suggesting a general mechanism for production of C terminus-truncated regulatory proteins.
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Affiliation(s)
- Peng Yao
- Department of Cell Biology, The Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
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Goswami D, Arif A, Saxena A, Batra S. Idiopathic primary ovarian insufficiency: a study of serial hormonal profiles to assess ovarian follicular activity. Hum Reprod 2011; 26:2218-25. [DOI: 10.1093/humrep/der174] [Citation(s) in RCA: 5] [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: 01/11/2023] Open
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Gullipalli D, Arif A, Aparoy P, Svenson GJ, Whiting MF, Reddanna P, Dutta-Gupta A. Identification of a developmentally and hormonally regulated Delta-Class glutathione S-transferase in rice moth Corcyra cephalonica. Comp Biochem Physiol B Biochem Mol Biol 2010; 156:33-9. [PMID: 20138238 DOI: 10.1016/j.cbpb.2010.01.016] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2009] [Revised: 01/29/2010] [Accepted: 01/30/2010] [Indexed: 10/19/2022]
Abstract
Glutathione S-transferases (GSTs) are a large family of multifunctional enzymes, known for their role in cellular detoxification. Here we report a cytosolic GST with optimal activity at alkaline pH (8.3) from the visceral fat body of late-last instar (LLI) larvae of a lepidopteran insect rice moth Corcyra cephalonica. All previously known GSTs are active between pH 6.0 to 6.5. Purification and characterization revealed the Corcyra cephalonica GST (CcGST) as a 23-kDa protein. HPLC and 2D analysis showed a single isoform of the protein in the LLI visceral fat body. Degenerate primer based method identified a 701-nucleotide cDNA and the longest open reading frame contained 216 amino acids. Multiple sequence and structural alignment showed close similarity with delta-class GSTs. CcGST is present mainly in the fat body with highest activity at the late-last instar larval stage. Juvenile hormone (JH) negatively inhibits the CcGST activity both ex vivo and in vivo. We speculate that high expression and activity of CcGST in the fat body of the late-last instar larvae, when endogenous JH titer is low may have role in the insect post-embryonic development unrelated to their previously known function.
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Luján L, Crespo T, Deb A, Arif A, Borjal R, Salazar E, Álvarez N, Pérez M, Dorrestein G, Hammer S. Aa Amyloidosis in Captive Beira Antelopes (Dorcatragus Megalotis) Linked to Mycoplasmal Pleuropneumonia. J Comp Pathol 2009. [DOI: 10.1016/j.jcpa.2009.08.074] [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: 10/20/2022]
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Mukhopadhyay R, Jia J, Arif A, Ray PS, Fox PL. The GAIT system: a gatekeeper of inflammatory gene expression. Trends Biochem Sci 2009; 34:324-31. [PMID: 19535251 DOI: 10.1016/j.tibs.2009.03.004] [Citation(s) in RCA: 174] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2009] [Revised: 03/26/2009] [Accepted: 03/26/2009] [Indexed: 12/25/2022]
Abstract
Functionally related genes are coregulated by specific RNA-protein interactions that direct transcript-selective translational control. In myeloid cells, interferon (IFN)-gamma induces formation of the heterotetrameric, IFN-gamma-activated inhibitor of translation (GAIT) complex comprising glutamyl-prolyl tRNA synthetase (EPRS), NS1-associated protein 1 (NSAP1), ribosomal protein L13a and glyceraldehyde-3-phosphate dehydrogenase (GAPDH). This complex binds defined 3' untranslated region elements within a family of inflammatory mRNAs and suppresses their translation. IFN-gamma-dependent phosphorylation, and consequent release of EPRS and L13a from the tRNA multisynthetase complex and 60S ribosomal subunit, respectively, regulates GAIT complex assembly. EPRS recognizes and binds target mRNAs, NSAP1 negatively regulates RNA binding, and L13a inhibits translation initiation by binding eukaryotic initiation factor 4G. Repression of a post-transcriptional regulon by the GAIT system might contribute to the resolution of chronic inflammation.
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Affiliation(s)
- Rupak Mukhopadhyay
- Department of Cell Biology, Lerner Research Institute, Cleveland Clinic, OH 44195, USA
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Fox PL, Mukhopadhyay R, Ray PS, Arif A, Jia J. SY-4 The gait system defines a post-transcriptional regulon that limits myeloid expression of inflammatory genes. Cytokine 2008. [DOI: 10.1016/j.cyto.2008.07.034] [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: 11/28/2022]
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Arif A, Manohar D, Gullipalli D, Dutta-Gupta A. Regulation of hexamerin receptor phosphorylation by hemolymph protein HP19 and 20-hydroxyecdysone directs hexamerin uptake in the rice moth Corcyra cephalonica. Insect Biochem Mol Biol 2008; 38:307-319. [PMID: 18252245 DOI: 10.1016/j.ibmb.2007.11.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2007] [Revised: 11/10/2007] [Accepted: 11/21/2007] [Indexed: 05/25/2023]
Abstract
Hexamerins are stage specifically sequestered during the non-feeding stages mainly by the fat body cells from hemolymph through ecdysteroid regulated receptor-mediated endocytosis. 20-Hydroxyecdysone (20E) stimulates the tyrosine kinase-mediated phosphorylation of the 120kDa hexamerin receptor in the rice moth, Corcyra cephalonica. Here, we demonstrate that phosphorylation of the hexamerin receptor by HP19-regulated-20E-dependent-tyrosine kinase is a critical regulator for its activation, and is required for hexamerin uptake. Hexamerin receptor is phosphorylated only in the hexamerin sequestering tissues. The receptor phosphorylation is a prerequisite for hexamerin uptake and both phosphorylation and concomitant uptake are developmentally regulated. In addition, endogenous fat body tyrosine kinase activity is also developmentally and hormonally regulated. 20E induces the tyrosine kinase activity both in vivo as well as ex vivo, and the receptor phosphorylation is likely an extra-cellular event. The hemolymph protein, HP19 inhibits the 20E-induced phosphorylation by inhibiting tyrosine kinase activity. These inhibitions are rapid in homogenate preparations and are unaffected by the inhibitors of transcription and translation. We propose that hexamerin sequestration is negatively regulated by active HP19 at the feeding larval stage, thus preventing the uptake. During the non-feeding pupal stage, high ecdysteroid titer and negligible HP19 activity, positively regulates the receptor phosphorylation resulting in hexamerin uptake. These studies are therefore the first evidence of hexamerin uptake regulated by the orchestration of 20E and HP19 at a nongenomic level.
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Affiliation(s)
- Abul Arif
- Department of Animal Sciences, School of Life Sciences, University of Hyderabad, Hyderabad 500 046, India
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Arif A, Fox PL. Cyclin‐dependent kinase 5 mediated phosphorylation of GluProRS induces translational silencing of inflammatory gene expression. FASEB J 2008. [DOI: 10.1096/fasebj.22.1_supplement.638.2] [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)
- Abul Arif
- Department of Cell BiologyLerner Research InstituteCleveland Clinic, ClevelandOH
| | - Paul L. Fox
- Department of Cell BiologyLerner Research InstituteCleveland Clinic, ClevelandOH
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Fox PL, Mukhopadhyay R, Ray PS, Arif A. The GAIT (interferon‐gamma‐activated inhibitor of translation) system defines an auto‐regulatory, negative‐feedback circuit that controls inflammatory gene expression. FASEB J 2008. [DOI: 10.1096/fasebj.22.1_supplement.601.4] [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)
- Paul L Fox
- Cell BiologyLerner Research InstituteCleveland Clinic, ClevelandOH
| | | | - Partho S Ray
- Cell BiologyLerner Research InstituteCleveland Clinic, ClevelandOH
| | - Abul Arif
- Cell BiologyLerner Research InstituteCleveland Clinic, ClevelandOH
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Arif A, Gullipalli D, Scheller K, Dutta-Gupta A. Significance of the 19-kDa hemolymph protein HP19 for the development of the rice moth Corcyra cephalonica: morphological and biochemical effects caused by antibody application. Arch Insect Biochem Physiol 2007; 66:32-44. [PMID: 17694564 DOI: 10.1002/arch.20195] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The hemolymph protein HP19 of the rice moth, Corcyra cephalonica, mediates the 20-hydroxyecdysone (20E)-dependent acid phosphatase (ACP) activity at a nongenomic level. Affinity-purified polyclonal antibody against HP19 (alphaHP19-IgG) was used in the present study to understand the role of HP19 during the postembryonic development of Corcyra. In the in vitro studies, HP19 action was blocked either by immuno-precipitation using alphaHP19-IgG, prior to its addition to the fat body culture or by the addition of the antibody directly to the culture, along with 20E and hemolymph containing HP19. The alphaHP19-IgG blocked the HP19-mediated 20E-dependent ACP activation. In the in vivo studies, the alphaHP19-IgG was injected into the fully developed last (final/Vth) instar larvae of Corcyra, to complex the HP19 in vivo, in order to block the action of HP19. The injection of alphaHP19-IgG resulted in defective development of larvae, which grew either into non-viable larvae or larval-pupal/pupal-adult intermediates relative to the effect of pre-immune IgG injected controls. The present study shows that HP19 plays an important role in controlling the metamorphosis of Corcyra by regulating the 20E-dependent ACP activity. Coupled with the earlier findings, the ecdysteroid hormone regulates this action at a nongenomic level.
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Affiliation(s)
- Abul Arif
- Department of Animal Sciences, School of Life Sciences, University of Hyderabad, Hyderabad, India
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38
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Ray PS, Arif A, Fox PL. Macromolecular complexes as depots for releasable regulatory proteins. Trends Biochem Sci 2007; 32:158-64. [PMID: 17321138 DOI: 10.1016/j.tibs.2007.02.003] [Citation(s) in RCA: 110] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2006] [Revised: 01/25/2007] [Accepted: 02/13/2007] [Indexed: 10/23/2022]
Abstract
Multi-component, macromolecular complexes perform essential cellular functions that require spatial or temporal coordination of activities. Complexes also facilitate co-regulation of protein amounts and cellular localization of individual components. We propose a novel function of multi-component complexes as depots for regulatory proteins that, upon release, acquire new auxiliary functions. We further propose that component release is inducible and context-dependent. We describe two cases in which multi-component assemblies - the ribosome and tRNA multi-synthetase complex--function as depots. Both complexes have crucial roles in supporting protein synthesis but they also release regulatory proteins for inflammation-responsive, transcript-specific translational control. Recent evidence indicates that other macromolecular assemblies might be sources for proteins with auxiliary functions, and the depot mechanism might be widespread in nature.
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Affiliation(s)
- Partho Sarothi Ray
- Department of Cell Biology, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Avenue/NC10, Cleveland, OH 44195, USA
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Affiliation(s)
- S Singh
- St. George's Hospital, London, UK.
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40
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Arif A, Fox PL. Serine phosphorylation of the linker domain of bifunctional glutamyl‐prolyl tRNA synthetase is critical for transcript‐specific translational silencing. FASEB J 2006. [DOI: 10.1096/fasebj.20.4.a496-d] [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)
- Abul Arif
- Cell BiologyLerner Research InstituteCleveland Clinic Foundation9500 Euclid AvenueClevelandOH44195
| | - Paul L Fox
- Cell BiologyLerner Research InstituteCleveland Clinic Foundation9500 Euclid AvenueClevelandOH44195
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Arif A, Vasanthi P, Hansen IA, Scheller K, Dutta-Gupta A. The Insect Hemolymph Protein HP19 Mediates the Nongenomic Effect of Ecdysteroids on Acid Phosphatase Activity. J Biol Chem 2004; 279:28000-8. [PMID: 15117951 DOI: 10.1074/jbc.m402311200] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [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: 11/06/2022] Open
Abstract
The activity of acid phosphatase (ACP) in insect fat bodies is stimulated by the steroid hormone 20-hydoxyecdysone (20E) in vivo. However, in fat bodies kept in culture, a factor from the hemolymph is required to enhance the ACP activity. We identified the factor as a protein with a molecular mass of 19 kDa (HP19) from the hemolymph of a lepidopteran insect, the rice moth, Corcyra cephalonica. Western analysis of hemolymph proteins with denaturing and non-denaturing PAGE using antibodies raised against HP19 suggest that this protein exists as a monomer. It is synthesized by the hind gut-associated lobular fat body of the larvae and is released into the hemolymph. The stimulatory effect of HP19 on the ACP activity is developmentally regulated and exhibits its maximal effect shortly before the onset of metamorphosis. We cloned the HP19 cDNA by immunoscreening a hind gut-associated lobular fat body cDNA expression library. Analysis of the amino acid sequence shows that HP19 belongs to the family of glutathione S-transferase (GST) like proteins. However, affinity-purified GST from Corcyra failed to show any mediation effect on 20E-stimulated ACP activity, and HP19 lacks GST enzymatic activity. Notably, HP19 mediates the hormone-stimulated ACP activity in intact fat body tissue and homogenates even in the presence of inhibitors of transcription and translation, suggesting a nongenomic mode of action. In addition, we show that HP19 inhibits the 20E-induced phosphorylation of the hexamerin receptor protein.
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Affiliation(s)
- Abul Arif
- Department of Animal Sciences, School of Life Sciences, University of Hyderabad, Hyderabad 500 046, India
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Arif A, Scheller K, Dutta-Gupta A. Tyrosine kinase mediated phosphorylation of the hexamerin receptor in the rice moth Corcyra cephalonica by ecdysteroids. Insect Biochem Mol Biol 2003; 33:921-928. [PMID: 12915183 DOI: 10.1016/s0965-1748(03)00098-5] [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] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Hexamerins are multifunctional insect storage proteins utilized during metamorphosis of holometabolous insects. These proteins are stage specifically taken up by the fat body cells from the haemolymph due to receptor-mediated endocytosis. The hexamerin receptor and the concomitant hexamerin sequestration in the rice moth Corcyra cephalonica is controlled by the steroid hormone 20-hydroxy-ecdysone (20E). However, the mechanism of receptor activation for hexamerin uptake is not yet clear. We report here that 20E stimulates the phosphorylation of 120 kDa hexamerin binding protein which has been demonstrated to represent the receptor. Phosphorylation of the receptor is suggested to be essential for receptor activation and occurs prior to the hexamerin uptake. The 20E stimulated phosphorylation is mediated partly by a tyrosine kinase as phosphotyrosine antibodies cross-react with the receptor and its phosphorylation is blocked partly by genistein. Back phosphorylation study provides additional evidence for 20E regulation of hexamerin receptor phosphorylation in intact fat body. The receptor phosphorylation is developmentally regulated. This is the first report demonstrating that (i) the uptake of hexamerin is dependent on the phosphorylation of hexamerin receptor and (ii) the phosphorylation is catalyzed partly by a tyrosine kinase which is activated by 20E through a non-genomic action.
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Affiliation(s)
- Abul Arif
- Department of Animal Sciences, School of Life Sciences, University of Hyderabad, 500 046 Hyderabad, India
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Arif A, Shanavas A, Murthy CRK, Dutta-Gupta A. Juvenile hormone stimulated tyrosine kinase-mediated protein phosphorylation in the CNS of the silk worm, Bombyx mori. Arch Insect Biochem Physiol 2002; 50:139-146. [PMID: 12111974 DOI: 10.1002/arch.10038] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
In vitro studies with the larval CNS of the silkworm, Bombyx mori revealed the phosphorylation of a 48-kDa protein, which was not dependent on cyclic nucleotides. Studies also revealed modest phosphorylation of this protein by a calcium-dependent but calmodulin-independent mechanism. However, phosphorylation of this protein was greatly enhanced in the presence of juvenile hormone (JH) I by a calcium-independent mechanism. This stimulatory effect of JH was seen in both homogenates as well as in intact CNS of Bombyx. Immunoblotting studies revealed the cross-reaction of this 48-kDa protein with phosphotyrosine monoclonal antibody and the phosphorylation of this protein was inhibited by genistein. This study suggests that the 48-kDa protein is a substrate for tyrosine kinase. The phosphorylation of this protein was also observed in other larval tissues such as salivary gland, fat body, and epidermis of Bombyx.
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Affiliation(s)
- A Arif
- Department of Animal Sciences, School of Life Sciences, University of Hyderabad, Hyderabad, India
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Zuberi SJ, Arif A. Serotyping of the hepatitis C in Pakistan. J PAK MED ASSOC 2002; 52:218-9. [PMID: 12174495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
Affiliation(s)
- S J Zuberi
- PMRC Research Centre, Jinnah Postgraduate Medical Center, Karachi
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Arif A, Sutjipto A. A study of aplastic anemia at the Department of Child Health, School of Medicine University of North Sumatera/Dr. Pirngadi Hospital, Medan. Paediatr Indones 1991; 31:253-60. [PMID: 1780164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
A study of aplastic anemia in children in a period of June 1980 to June 1989 was done to evaluate the pattern of aplastic anemia in children. The cases consisted of 55 children, 30 males (54.55%) and 25 females (45.45%). Most of the patients (47.27%) were found in the age group of 10 to 15 years. The complaints were paleness (90.91%), fever (56.45%) and bleeding (52.72%). The hemoglobin concentration was 4.25 +/- 1.17 g/dl (mean +/- SD), and the thrombocytopenia was generally severe. Prednisone or combination of prednisone and oxymethalone was given in addition to blood transfusions, antibiotics and vitamins. The outcome was difficult to evaluate because of the irregularity of treatments. Of the 55 children, 9 (18.02%) contracted leukemia after 1-5 months.
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Affiliation(s)
- A Arif
- Department of Child Health, School of Medicine, University of North Sumatera/Dr. Pirngadi Hospital, Medan
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Arif A, Karetzky MS. Complications of caustic ingestion. N J Med 1991; 88:201-4. [PMID: 2034405] [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] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The use of steroid and antibiotic prophylaxis no longer is tenable on the basis of recent studies showing their inability to favorably influence the outcome of caustic injuries. The need for early endoscopic and radiologic assessment if not gastroesophagectomy for severe injuries now is the management of choice. Further efforts to identify high-risk populations and efforts to educate them of the dangers must continue.
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Affiliation(s)
- A Arif
- Division of Pulmonary/Critical Care Medicine, Newark Beth Israel Medical Center, NJ 07112
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Abstract
In this paper, drug prevention programs in 29 countries are reviewed and summarized. The material was gathered from the reports that each country had prepared for the World Health Organization project on Guidelines for Drug Abuse Prevention. Each report provided a detailed schedule of background data on drug abuse and prevention programs in that country. The sophistication of prevention programs varies considerably from one country to another and depends on the degree and nature of the problem. An analysis of this material indicates that the seriousness of the drug problem is well recognized in some countries but not in others. In some of the latter countries it is obvious that no real problem exists, while in others little is known about the extent of the problem and little effort is spent in this area.
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Affiliation(s)
- R G Smart
- Addiction Research Foundation, Toronto, Ontario, Canada
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Hughes PH, Canavan KP, Jarvis G, Arif A. Extent of drug abuse: an international review with implications for health planners. World Health Stat Q 1983; 36:394-497. [PMID: 6678088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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Smart RG, Arif A, Hughes PH, Medina Mora ME, Navaratnam V, Varma VK, Wadud KA. Drug use among non-student youth. WHO Offset Publ 1981:1-58. [PMID: 7336828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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