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Minuk LM, Brode SK, Mehrabi M, Sharma MK, Stobart M, Soualhine H, Marras TK. Phenotypic amikacin resistance may not indicate poor response to amikacin in Mycobacterium avium complex pulmonary disease. Antimicrob Agents Chemother 2024:e0008424. [PMID: 38758004 DOI: 10.1128/aac.00084-24] [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] [Received: 01/21/2024] [Accepted: 04/20/2024] [Indexed: 05/18/2024] Open
Abstract
When using amikacin to treat Mycobacterium avium complex pulmonary disease (MAC-PD), a minimum inhibitory concentration resistance breakpoint of ≥64 mcg/mL is recommended. We explored whether amikacin resistance characterized by phenotypic drug susceptibility testing was associated with clinical outcomes or mutational resistance in a retrospective cohort of patients with MAC-PD. Despite little aminoglycoside exposure, amikacin resistance was common in our MAC-PD patients but was not associated with worse outcomes or rrs gene mutations.
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Affiliation(s)
- L M Minuk
- Division of Respirology, Department of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - S K Brode
- Division of Respirology, Department of Medicine, University of Toronto, Toronto, Ontario, Canada
- Division of Respirology, Department of Medicine, University Health Network, Mount Sinai Hospital, Toronto, Ontario, Canada
- Division of Respiratory Medicine, West Park Healthcare Centre, Toronto, Ontario, Canada
| | - M Mehrabi
- Division of Respirology, Department of Medicine, Toronto Western Hospital, Toronto, Ontario, Canada
| | - M K Sharma
- National Reference Centre for Mycobacteriology, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada
- Department of Medical Microbiology and Infectious Diseases, University of Manitoba, Winnipeg, Manitoba, Canada
| | - M Stobart
- Department of Medical Microbiology and Infectious Diseases, University of Manitoba, Winnipeg, Manitoba, Canada
| | - H Soualhine
- National Reference Centre for Mycobacteriology, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada
- Department of Medical Microbiology and Infectious Diseases, University of Manitoba, Winnipeg, Manitoba, Canada
- McGill International TB Centre, McGill University, Montreal, Quebec, Canada
| | - T K Marras
- Division of Respirology, Department of Medicine, University of Toronto, Toronto, Ontario, Canada
- Division of Respirology, Department of Medicine, University Health Network, Mount Sinai Hospital, Toronto, Ontario, Canada
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Lockhart EJ, Horowitz LF, Rodríguez A, Zhu S, Nguyen T, Mehrabi M, Gujral TS, Folch A. Drug testing of monodisperse arrays of live microdissected tumors using a valved multiwell microfluidic platform. Lab Chip 2024; 24:2683-2699. [PMID: 38651213 DOI: 10.1039/d4lc00016a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/25/2024]
Abstract
Cancer drug testing in animals is an extremely poor predictor of the drug's safety and efficacy observed in humans. Hence there is a pressing need for functional testing platforms that better predict traditional and immunotherapy responses in human, live tumor tissue or tissue constructs, and at the same time are compatible with the use of mouse tumor tissue to facilitate building more accurate disease models. Since many cancer drug actions rely on mechanisms that depend on the tumor microenvironment (TME), such platforms should also retain as much of the native TME as possible. Additionally, platforms based on miniaturization technologies are desirable to reduce animal use and sensitivity to human tissue scarcity. Present high-throughput testing platforms that have some of these features, e.g. based on patient-derived tumor organoids, require a growth step that alters the TME. On the other hand, microdissected tumors (μDTs) or "spheroids" that retain an intact TME have shown promising responses to immunomodulators acting on native immune cells. However, difficult tissue handling after microdissection has reduced the throughput of drug testing on μDTs, thereby constraining the inherent advantages of producing numerous TME-preserving units of tissue for drug testing. Here we demonstrate a microfluidic 96-well platform designed for drug treatment of hundreds of similarly-sized, cuboidal μDTs ("cuboids") produced from a single tumor sample. The platform organizes a monodisperse array of four cuboids per well in 384 hydrodynamic traps. The microfluidic device, entirely fabricated in thermoplastics, features 96 microvalves that fluidically isolate each well after the cuboid loading step for straightforward multi-drug testing. Since our platform makes the most of scarce tumor tissue, it can potentially be applied to human biopsies that preserve the human TME while minimizing animal testing.
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Affiliation(s)
- Ethan J Lockhart
- Department of Bioengineering, University of Washington, Seattle, USA.
| | - Lisa F Horowitz
- Department of Bioengineering, University of Washington, Seattle, USA.
| | - Adán Rodríguez
- Department of Bioengineering, University of Washington, Seattle, USA.
| | - Songli Zhu
- Human Biology Division, Fred Hutchinson Cancer Research Center, Seattle, USA
| | - Tran Nguyen
- Department of Bioengineering, University of Washington, Seattle, USA.
| | | | - Taranjit S Gujral
- Human Biology Division, Fred Hutchinson Cancer Research Center, Seattle, USA
| | - Albert Folch
- Department of Bioengineering, University of Washington, Seattle, USA.
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Seyedi S, Parvin P, Jafargholi A, Abbasian A, Mehdinejad M, Khorrami A, Mehrabi M, Moafi A. Fluorescence emission quenching of RdB fluorophores in attendance of various blood type RBCs based on Stern-Volmer formalism. Spectrochim Acta A Mol Biomol Spectrosc 2021; 248:119237. [PMID: 33307349 DOI: 10.1016/j.saa.2020.119237] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Revised: 11/09/2020] [Accepted: 11/14/2020] [Indexed: 06/12/2023]
Abstract
In this work, the optical properties of Rhodamine B (RdB) are investigated in the attendance of various red blood cells (RBCs). RdB fluorophores, as biological markers, is excited using SHG-CW Nd:YAG laser at 532 nm. In fact, the addition of biomolecules of interest to the reference fluorophore notably changes the fluorescence properties of the suspension. Here, laser induced fluorescence (LIF) spectrophotometry based on Stern-Volmer quenching formalism and field emission scanning electron microscope (FESEM) are employed here. According to the given fluorescence spectra, the spectral shift of emissions as well as quenching coefficients are assessed subsequently. The Stern-Volmer formalism is used to determine the quenching coefficients. In fact, RdB + RBCs suspensions contain a plenty of bioconjugates leading to the signal reduction and notable red shift in RdB fluorescence emissions. Furthermore, it is demonstrated that the positive blood type RBCs exhibit the higher quenching coefficients and the larger red shifts against those of negative blood types. This mainly arises from the nature of specific sugar antigens available on the RBC membranes as to N-acetylgalactosamine and galactose attached to the O-antigen terminal would enhance further quenching of the species. Moreover, a significant correlation appears between Stern-Volmer coefficients and the corresponding RBCs. In fact, distinct discrepancy takes place in quenching coefficients in terms various positive/negative blood types to envisage a facile method of blood typing.
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Affiliation(s)
- S Seyedi
- Physics Department, Amirkabir University of Technology, Tehran 15875-4413, Iran
| | - P Parvin
- Physics Department, Amirkabir University of Technology, Tehran 15875-4413, Iran.
| | - A Jafargholi
- Physics Department, Amirkabir University of Technology, Tehran 15875-4413, Iran
| | - A Abbasian
- Tehran Blood Transfusion Center, P.O. Box 1416613141, Tehran, Iran
| | - M Mehdinejad
- Tehran Blood Transfusion Center, P.O. Box 1416613141, Tehran, Iran
| | - A Khorrami
- CinnaGen Medical Biotechnology Research Center, Alborz University of Medical Sciences, P.O. Box 3165933155, Alborz, Iran; CinnaGen Research and Production Co., P.O. Box 3165933155, Alborz, Iran
| | - M Mehrabi
- Department of Physics, Persian Gulf University, P.O. Box 7516913817, Bushehr, Iran
| | - A Moafi
- Physics Department, Amirkabir University of Technology, Tehran 15875-4413, Iran
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Horowitz LF, Rodriguez AD, Au-Yeung A, Bishop KW, Barner LA, Mishra G, Raman A, Delgado P, Liu JTC, Gujral TS, Mehrabi M, Yang M, Pierce RH, Folch A. Microdissected "cuboids" for microfluidic drug testing of intact tissues. Lab Chip 2021; 21:122-142. [PMID: 33174580 PMCID: PMC8205430 DOI: 10.1039/d0lc00801j] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
As preclinical animal tests often do not accurately predict drug effects later observed in humans, most drugs under development fail to reach the market. Thus there is a critical need for functional drug testing platforms that use human, intact tissues to complement animal studies. To enable future multiplexed delivery of many drugs to one small biopsy, we have developed a multi-well microfluidic platform that selectively treats cuboidal-shaped microdissected tissues or "cuboids" with well-preserved tissue microenvironments. We create large numbers of uniformly-sized cuboids by semi-automated sectioning of tissue with a commercially available tissue chopper. Here we demonstrate the microdissection method on normal mouse liver, which we characterize with quantitative 3D imaging, and on human glioma xenograft tumors, which we evaluate after time in culture for viability and preservation of the microenvironment. The benefits of size uniformity include lower heterogeneity in future biological assays as well as facilitation of their physical manipulation by automation. Our prototype platform consists of a microfluidic circuit whose hydrodynamic traps immobilize the live cuboids in arrays at the bottom of a multi-well plate. Fluid dynamics simulations enabled the rapid evaluation of design alternatives and operational parameters. We demonstrate the proof-of-concept application of model soluble compounds such as dyes (CellTracker, Hoechst) and the cancer drug cisplatin. Upscaling of the microfluidic platform and microdissection method to larger arrays and numbers of cuboids could lead to direct testing of human tissues at high throughput, and thus could have a significant impact on drug discovery and personalized medicine.
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Affiliation(s)
- Lisa F Horowitz
- Department of Bioengineering, University of Washington, Seattle, WA, USA.
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Mehrabi M, Salehi B, Rassi H, Dehghan A. Evaluating the antibiotic resistance and frequency of adhesion markers among Escherichia coli isolated from type 2 diabetes patients with urinary tract infection and its association with common polymorphism of mannose-binding lectin gene. New Microbes New Infect 2020; 38:100827. [PMID: 33364032 PMCID: PMC7750139 DOI: 10.1016/j.nmni.2020.100827] [Citation(s) in RCA: 1] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2020] [Revised: 10/25/2020] [Accepted: 11/20/2020] [Indexed: 01/11/2023] Open
Abstract
The present paper aims to determine the frequency and antibiotic resistance patterns of pathogenic bacteria, the virulence factor profile of Escherichia coli and mannose-binding lectin (MBL) gene polymorphism in individuals with diabetes mellitus (DM) and urinary tract infection (UTI). The population under study was 130 individuals with type 2 diabetes mellitus (T2DM) and UTI. The patients' clinical characteristics and urine and blood samples (5 mL) were collected. Antibiotic resistance was determined using a disc diffusion method, and the results were interpreted according to CLSI. The presence of virulence genes was detected by multiplex PCR. To detect the MBL gene polymorphism, PCR and restriction fragment length polymorphism methods were applied. The predominant Gram-negative and Gram-positive bacteria included E. coli and Streptococcus spp.viridans group, respectively. Women were more susceptible to the incidence of UTI than men. The E. coli isolates showed a high level of resistance to amoxicillin-clavulanic acid (87.35%), and nitrofurantoin and ceftizoxime were the most effective antimicrobial agents for E. coli. Cefotaxime and ceftizoxime were the most effective antimicrobial agents for Enterobacter spp., norfloxacin and ciprofloxacin were the most effective antimicrobial agents for Staphylococcus epidermidis and Staphylococcus saprophyticus. papGII (52.87%) and papEF (1.14%) had the highest and lowest frequency among examined genes in E. coli isolates, respectively. The GG genotype had the highest frequency among patients with T2DM and UTI. Results showed that the detection of E. coli in individuals with an AA genotype, codon 54 of the MBL gene, can play an important role in the molecular diagnosis and timely treatment of bacterial infections in individuals with diabetes.
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Affiliation(s)
- M. Mehrabi
- Department of Microbiology, Karaj Branch, Islamic Azad University, Karaj, Iran
| | - B. Salehi
- Department of Microbiology, Karaj Branch, Islamic Azad University, Karaj, Iran
| | - H. Rassi
- Department of Microbiology, Karaj Branch, Islamic Azad University, Karaj, Iran
| | - A. Dehghan
- Department of Pathobiology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
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Mehrabi M, Montazeri H, Mohamadpour Dounighi N, Rashti A, Vakili-Ghartavol R. Chitosan-based Nanoparticles in Mucosal Vaccine Delivery. Arch Razi Inst 2018; 73:165-176. [PMID: 30280836 DOI: 10.22092/ari.2017.109235.1101] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Accepted: 06/18/2018] [Indexed: 09/30/2022]
Abstract
Most infectious diseases are caused by pathogenic infiltrations from the mucosal tract. Nowadays, the use of vaccines has been widely investigated for the prevention of different infectious diseases, infertility, immune disorders, malignancies, and allergies. Broad-spectrum adjuvant substances have been studied for immune system stimulation with a greater efficiency against specific antigens. Various adjuvants have been developed such as inorganic, oil-based, and emulsion adjuvants, bacterial products and their derivatives, cytokines, cytosine-guanine dinucleotide (CpG) motifs, and particulate systems. Mucosal vaccine delivery is an alternative route to induce both humoral and cellular immune responses. Applying nanoparticles in vaccine formulations allows not only improved antigen stability and immunogenicity, but also targeted delivery, and consequently, more specific release of the agent of interest. Chitosan nanoparticles have immunological activity and mucoadhesive properties. They have been used as a mucosal vaccine delivery system for many antigens. This review provides an overview of the recent advances in chitosan nanoparticles as a novel mucosal vaccine delivery system.
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Affiliation(s)
- M Mehrabi
- Department of Medical Nanotechnology, School of Medicine, Shahroud University of Medical Sciences, Shahroud, Iran
| | - H Montazeri
- Department of Medical Nanotechnology, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - N Mohamadpour Dounighi
- Department of Human Vaccine and Serum, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization, Karaj Iran.,Department of Human Vaccine and Serum, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization, Karaj Iran
| | - A Rashti
- Department of Medical Nanotechnology, School of Medicine, Shahroud University of Medical Sciences, Shahroud, Iran
| | - R Vakili-Ghartavol
- Department of Medical Nanotechnology, School of Medicine, Shahroud University of Medical Sciences, Shahroud, Iran
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9
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Zamora JC, Svensson M, Kirschner R, Olariaga I, Ryman S, Parra LA, Geml J, Rosling A, Adamčík S, Ahti T, Aime MC, Ainsworth AM, Albert L, Albertó E, García AA, Ageev D, Agerer R, Aguirre-Hudson B, Ammirati J, Andersson H, Angelini C, Antonín V, Aoki T, Aptroot A, Argaud D, Sosa BIA, Aronsen A, Arup U, Asgari B, Assyov B, Atienza V, Bandini D, Baptista-Ferreira JL, Baral HO, Baroni T, Barreto RW, Beker H, Bell A, Bellanger JM, Bellù F, Bemmann M, Bendiksby M, Bendiksen E, Bendiksen K, Benedek L, Bérešová-Guttová A, Berger F, Berndt R, Bernicchia A, Biketova AY, Bizio E, Bjork C, Boekhout T, Boertmann D, Böhning T, Boittin F, Boluda CG, Boomsluiter MW, Borovička J, Brandrud TE, Braun U, Brodo I, Bulyonkova T, Burdsall HH, Buyck B, Burgaz AR, Calatayud V, Callac P, Campo E, Candusso M, Capoen B, Carbó J, Carbone M, Castañeda-Ruiz RF, Castellano MA, Chen J, Clerc P, Consiglio G, Corriol G, Courtecuisse R, Crespo A, Cripps C, Crous PW, da Silva GA, da Silva M, Dam M, Dam N, Dämmrich F, Das K, Davies L, De Crop E, De Kesel A, De Lange R, De Madrignac Bonzi B, dela Cruz TEE, Delgat L, Demoulin V, Desjardin DE, Diederich P, Dima B, Dios MM, Divakar PK, Douanla-Meli C, Douglas B, Drechsler-Santos ER, Dyer PS, Eberhardt U, Ertz D, Esteve-Raventós F, Salazar JAE, Evenson V, Eyssartier G, Farkas E, Favre A, Fedosova AG, Filippa M, Finy P, Flakus A, Fos S, Fournier J, Fraiture A, Franchi P, Molano AEF, Friebes G, Frisch A, Fryday A, Furci G, Márquez RG, Garbelotto M, García-Martín JM, Otálora MAG, Sánchez DG, Gardiennet A, Garnica S, Benavent IG, Gates G, da Cruz Lima Gerlach A, Ghobad-Nejhad M, Gibertoni TB, Grebenc T, Greilhuber I, Grishkan B, Groenewald JZ, Grube M, Gruhn G, Gueidan C, Gulden G, Gusmão LFP, Hafellner J, Hairaud M, Halama M, Hallenberg N, Halling RE, Hansen K, Harder CB, Heilmann-Clausen J, Helleman S, Henriot A, Hernandez-Restrepo M, Herve R, Hobart C, Hoffmeister M, Høiland K, Holec J, Holien H, Hughes K, Hubka V, Huhtinen S, Ivančević B, Jagers M, Jaklitsch W, Jansen A, Jayawardena RS, Jeppesen TS, Jeppson M, Johnston P, Jørgensen PM, Kärnefelt I, Kalinina LB, Kantvilas G, Karadelev M, Kasuya T, Kautmanová I, Kerrigan RW, Kirchmair M, Kiyashko A, Knapp DG, Knudsen H, Knudsen K, Knutsson T, Kolařík M, Kõljalg U, Košuthová A, Koszka A, Kotiranta H, Kotkova V, Koukol O, Kout J, Kovács GM, Kříž M, Kruys Å, Kučera V, Kudzma L, Kuhar F, Kukwa M, Arun Kumar TK, Kunca V, Kušan I, Kuyper TW, Lado C, Læssøe T, Lainé P, Langer E, Larsson E, Larsson KH, Laursen G, Lechat C, Lee S, Lendemer JC, Levin L, Lindemann U, Lindström H, Liu X, Hernandez RCL, Llop E, Locsmándi C, Lodge DJ, Loizides M, Lőkös L, Luangsa-ard J, Lüderitz M, Lumbsch T, Lutz M, Mahoney D, Malysheva E, Malysheva V, Manimohan P, Marin-Felix Y, Marques G, Martínez-Gil R, Marson G, Mata G, Matheny PB, Mathiassen GH, Matočec N, Mayrhofer H, Mehrabi M, Melo I, Mešić A, Methven AS, Miettinen O, Romero AMM, Miller AN, Mitchell JK, Moberg R, Moreau PA, Moreno G, Morozova O, Morte A, Muggia L, González GM, Myllys L, Nagy I, Nagy LG, Neves MA, Niemelä T, Nimis PL, Niveiro N, Noordeloos ME, Nordin A, Noumeur SR, Novozhilov Y, Nuytinck J, Ohenoja E, Fiuza PO, Orange A, Ordynets A, Ortiz-Santana B, Pacheco L, Pál-Fám F, Palacio M, Palice Z, Papp V, Pärtel K, Pawlowska J, Paz A, Peintner U, Pennycook S, Pereira OL, Daniëls PP, Pérez-De-Gregorio Capella MÀ, del Amo CMP, Gorjón SP, Pérez-Ortega S, Pérez-Vargas I, Perry BA, Petersen JH, Petersen RH, Pfister DH, Phukhamsakda C, Piątek M, Piepenbring M, Pino-Bodas R, Esquivel JPP, Pirot P, Popov ES, Popoff O, Álvaro MP, Printzen C, Psurtseva N, Purahong W, Quijada L, Rambold G, Ramírez NA, Raja H, Raspé O, Raymundo T, Réblová M, Rebriev YA, de Dios Reyes García J, Ripoll MÁR, Richard F, Richardson MJ, Rico VJ, Robledo GL, Barbosa FR, Rodriguez-Caycedo C, Rodriguez-Flakus P, Ronikier A, Casas LR, Rusevska K, Saar G, Saar I, Salcedo I, Martínez SMS, Montoya CAS, Sánchez-Ramírez S, Sandoval-Sierra JV, Santamaria S, Monteiro JS, Schroers HJ, Schulz B, Schmidt-Stohn G, Schumacher T, Senn-Irlet B, Ševčíková H, Shchepin O, Shirouzu T, Shiryaev A, Siepe K, Sir EB, Sohrabi M, Soop K, Spirin V, Spribille T, Stadler M, Stalpers J, Stenroos S, Suija A, Sunhede S, Svantesson S, Svensson S, Svetasheva TY, Świerkosz K, Tamm H, Taskin H, Taudière A, Tedebrand JO, Lahoz RT, Temina M, Thell A, Thines M, Thor G, Thüs H, Tibell L, Tibell S, Timdal E, Tkalčec Z, Tønsberg T, Trichies G, Triebel D, Tsurykau A, Tulloss RE, Tuovinen V, Sosa MU, Urcelay C, Valade F, Garza RV, van den Boom P, Van Vooren N, Vasco-Palacios AM, Vauras J, Velasco Santos JM, Vellinga E, Verbeken A, Vetlesen P, Vizzini A, Voglmayr H, Volobuev S, von Brackel W, Voronina E, Walther G, Watling R, Weber E, Wedin M, Weholt Ø, Westberg M, Yurchenko E, Zehnálek P, Zhang H, Zhurbenko MP, Ekman S. Considerations and consequences of allowing DNA sequence data as types of fungal taxa. IMA Fungus 2018; 9:167-175. [PMID: 30018877 PMCID: PMC6048565 DOI: 10.5598/imafungus.2018.09.01.10] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Accepted: 05/21/2018] [Indexed: 11/11/2022] Open
Abstract
Nomenclatural type definitions are one of the most important concepts in biological nomenclature. Being physical objects that can be re-studied by other researchers, types permanently link taxonomy (an artificial agreement to classify biological diversity) with nomenclature (an artificial agreement to name biological diversity). Two proposals to amend the International Code of Nomenclature for algae, fungi, and plants (ICN), allowing DNA sequences alone (of any region and extent) to serve as types of taxon names for voucherless fungi (mainly putative taxa from environmental DNA sequences), have been submitted to be voted on at the 11th International Mycological Congress (Puerto Rico, July 2018). We consider various genetic processes affecting the distribution of alleles among taxa and find that alleles may not consistently and uniquely represent the species within which they are contained. Should the proposals be accepted, the meaning of nomenclatural types would change in a fundamental way from physical objects as sources of data to the data themselves. Such changes are conducive to irreproducible science, the potential typification on artefactual data, and massive creation of names with low information content, ultimately causing nomenclatural instability and unnecessary work for future researchers that would stall future explorations of fungal diversity. We conclude that the acceptance of DNA sequences alone as types of names of taxa, under the terms used in the current proposals, is unnecessary and would not solve the problem of naming putative taxa known only from DNA sequences in a scientifically defensible way. As an alternative, we highlight the use of formulas for naming putative taxa (candidate taxa) that do not require any modification of the ICN.
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Affiliation(s)
- Juan Carlos Zamora
- Museum of Evolution, Uppsala University, Norbyvägen 16, 75236 Uppsala, Sweden
| | - Måns Svensson
- Museum of Evolution, Uppsala University, Norbyvägen 16, 75236 Uppsala, Sweden
| | | | - Ibai Olariaga
- Universidad Rey Juan Carlos, 28933 Móstoles, Madrid, Spain
| | - Svengunnar Ryman
- Museum of Evolution, Uppsala University, Norbyvägen 16, 75236 Uppsala, Sweden
| | | | - József Geml
- Naturalis Biodiversity Center, Vondellaan 55, 2332AA Leiden, The Netherlands
| | - Anna Rosling
- Evolutionary Biology Centre, Uppsala University, Norbyvägen 18D, 75236 Uppsala, Sweden
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- Museum of Evolution, Uppsala University, Norbyvägen 16, 75236 Uppsala, Sweden
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Affiliation(s)
- Mehdi Mehrabi
- Department of Plant Protection, Faculty of Agriculture, University of Zanjan, Zanjan, Iran
| | - Roghayeh Hemmati
- Department of Plant Protection, Faculty of Agriculture, University of Zanjan, Zanjan, Iran
| | - Bita Asgari
- Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran
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Affiliation(s)
- Mehdi Mehrabi
- Department of Plant Protection, Faculty of Agriculture, University of Zanjan, Zanjan, Iran
| | - Roghayeh Hemmati
- Department of Plant Protection, Faculty of Agriculture, University of Zanjan, Zanjan, Iran
| | - Jafar Abdollahzadeh
- Department of Plant Protection, Faculty of Agriculture, University of Kurdistan, P.O. Box 416, Sanandaj, Iran
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Wichmann H, Hugdahl L, Rotko N, Mehrabi M, Holst M, Ellegard L. SUN-P024: Nutrition Practice in Nordic ICÙS- A Questionnaire Investigation Among Physicians and Nurses. Clin Nutr 2016. [DOI: 10.1016/s0261-5614(16)30367-3] [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]
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14
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Mehrabi M, Javid A, Hashemi A, Rezaei-Zarchi S. Investigation of the Effect of Folic Acid Based Iron Oxide Nanoparticles on Human Leukemic CCRF-CEM Cell Line. Iran J Ped Hematol Oncol 2013; 3:47-53. [PMID: 24575269 PMCID: PMC3915447] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Accepted: 06/02/2013] [Indexed: 12/01/2022]
Abstract
BACKGROUND Nanoparticulate drug delivery systems have attracted significant attention in the field of cancer nanotechnology. This study determines the effect of folate-based Fe2O3 nanoparticles. This study aimed to decorate nanoparticles with folate (FA), a molecular ligand for 'active' targeting of cancerous cells and the application of modified-nanoparticles in cancer treatment. MATERIALS AND METHODS The nanoparticles were prepared by a solvent evaporation and emulsification cross-linking method and anticancer activity of agent was evaluated on CCRF CEM cells, derived from human blood cancer samples. RESULTS The physicochemical properties of the nanoparticles were characterized by various techniques, and uniform nanoparticles with an average particle size of 110±15 nm were obtained. Cytotoxicity tests showed that the SPIO-FA had higher cell toxicity, and confocal microscopy analysis confirmed excellent cellular uptake efficiency. CONCLUSION These results indicate that FA based SPIO-NPs have potential uses as anticancer drug carriers and also have an enhanced anticancer effect.
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Affiliation(s)
- M Mehrabi
- Genetics Group, Jehad Daneshgahi University, Yazd, Iran
| | - A Javid
- Department of Biochemistry, Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran.
| | - A Hashemi
- Department of Pediatrics, Hematology, Oncology and Genetics Research Center, Shahid Sadoughi University of Medical Sciences and Health Services,Yazd, Iran
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15
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Mortazavi M, Akbarzadeh A, Farhangi A, Mehrabi M, Hosseinian Z, Mokhtari MJ, Saffari Z. Immunosuppressive proteins isolated from spiral and coccoid cytoplasmic solutions of Helicobacter pylori. Pak J Biol Sci 2011; 14:128-32. [PMID: 21916264 DOI: 10.3923/pjbs.2011.128.132] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The aim of this study was to investigate the antiproliferative proteins that probably have a role in Helicobacter pylori evade of immune response and cause chronic infection disease and also to see if coccoid form had a role in its chronicity. H. pylori strain VacA s2/m2 positive and CagA negative, from a gastric biopsy of a patient with peptic ulcer disease, was isolated and cultured in brucella agar. Both spiral and coccoid forms were harvested and ruptured by sonication. The cytoplasmic solutions of both forms were collected and their fractions obtained by gel chromatography and preparative polyacrylamide gel electrophoresis. The fractions were analyzed by MTT assay for their antiproliferative activity. We isolated two proteins with a significant dose dependent antiproliferative activity that analyzed with sodium dodecyl sulfate-polyacrylamide gel electrophoresis, one of them that was urease positive showed two bands with 61 and 27 kDa, which is resumed to urease of H. pylori, another consist of 57 and 63 kDa. Helicobacterpylori secret some proteins like urease that inhibit immune cells proliferation response against its antigens.
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Affiliation(s)
- M Mortazavi
- Department of Pilot Biotechnology, Pasteur institute of Iran, Tehran, Iran
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16
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Kargarfard M, Eetemadifar M, Mehrabi M, Maghzi AH, Hayatbakhsh MR. Fatigue, depression, and health-related quality of life in patients with multiple sclerosis in Isfahan, Iran. Eur J Neurol 2011; 19:431-7. [PMID: 21967324 DOI: 10.1111/j.1468-1331.2011.03535.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND AND PURPOSE Quality of life (QoL) of patients with multiple sclerosis (MS) is worse than that of other chronic diseases. There is a need to examine the impact of fatigue and depression on the QoL independent of level of physical disability in MS. The aim of this study is to explore physical, psychological, and social aspects of health-related QoL (HRQoL) of MS patients in association with physical disability, fatigue, and depression. METHODS In a cross-sectional study, 281 (63.4% women, 36.6% men) patients with MS participated in the study. The HRQoL was assessed by the Persian version of the multiple sclerosis quality of life (MSQoL-54) questionnaires. Other covariates included in the study were disease type, physical disability, fatigue, disease impact, and depression. RESULTS In univariate analysis disease type, physical disability, fatigue, disease impact, and depression were significantly associated with both physical and mental health composite summaries of MSQoL-54. In multivariate regression analysis, patients' physical disability remained significantly associated with both components of MSQoL-54, whilst fatigue and depression were associated with physical and mental composite summaries, respectively. CONCLUSIONS Our findings suggest that MS-related physical disability, fatigue, and depression affect the HRQoL of MS patients, independently of each other and other potential confounding factors. Effective interventions that target fatigue and depression may help improve the QoL of patients, regardless of their disease type and level of disability.
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Affiliation(s)
- M Kargarfard
- Faculty of Physical Education and Sport Sciences, University of Isfahan, Isfahan, Iran.
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17
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Oskarsson V, Mehrabi M, Orsini N, Hammarqvist F, Segersvärd R, Andrén-Sandberg A, Sadr Azodi O. Validation of the harmless acute pancreatitis score in predicting nonsevere course of acute pancreatitis. Pancreatology 2011; 11:464-8. [PMID: 21968430 DOI: 10.1159/000331502] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [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] [Received: 05/26/2011] [Accepted: 08/04/2011] [Indexed: 12/11/2022]
Abstract
BACKGROUND The Harmless Acute Pancreatitis Score (HAPS) is a scoring algorithm to identify patients with nonsevere acute pancreatitis. The aim of this study was to evaluate the reproducibility of HAPS outside its original study setting. METHOD Baseline information of all hospitalized patients with acute pancreatitis at Karolinska University Hospital, Stockholm, Sweden, between 2004 and 2009 was collected. The parameters constituting HAPS were signs of peritonitis, hematocrit and serum creatinine levels. Since hematocrit was not available in all patients, complete sample analysis was performed by replacing hematocrit with hemoglobin (strongly correlated with hematocrit; r = 0.86). RESULTS In total, 531 patients with a first-time or a recurrent attack of acute pancreatitis were included. Among 353 patients with complete information on parameters constituting HAPS, 79 patients were predicted to have a nonsevere course, of whom 1 patient developed severe acute pancreatitis. The specificity of HAPS in predicting a nonsevere course of acute pancreatitis was 96.3% (95% CI: 81.0-99.9) with a corresponding positive predictive value of 98.7% (95% CI: 93.1-100). Complete sample analysis replacing hematocrit with hemoglobin level predicted a nonsevere course in 182 patients, of whom 2 patients had severe acute pancreatitis (94.3% specificity and 98.9% positive predictive value). CONCLUSION HAPS is a highly specific scoring algorithm that predicts a nonsevere course of acute pancreatitis. Therefore, HAPS might be an additional tool in the clinical assessment of acute pancreatitis where early screening is important to treat the patients at an optimal level of care.
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Affiliation(s)
- V Oskarsson
- Department of Gastrointestinal Surgery, Karolinska University Hospital, Stockholm, Sweden.
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18
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Mehrabi M, Zargari F, Ghanbari M. Fast and low complexity method for content accessing and extracting DC-pictures from H.264 coded videos. IEEE Trans Consumer Electron 2010; 56:1801-1808. [DOI: 10.1109/tce.2010.5606329] [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: 08/31/2023]
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Mahdavi Zafarghandi R, Mehrabi M, Ghaior A, Mahdavi zafarghandi M. UP-1.143: Incisional Hernia of Surgical Site After Kidney Transplantation and its Repair with Propylene Mesh. Urology 2009. [DOI: 10.1016/j.urology.2009.07.590] [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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20
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Akbarzadeh A, Norouzian D, Farhangi A, Mehrabi M, Chiani M, Zare D, Saffari Z, Mortazavi M, Nikdel A. Immunotherapy of 347 Volunteer Outpatient Morphine Addicts by Human Therapeutic Morphine Vaccine in Kermanshah Province of Iran. ACTA ACUST UNITED AC 2008. [DOI: 10.3923/jpt.2009.30.35] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Karimi P, Bayati A, Mehrabi M. Childhood Infections and Vaccination History as a Risk of Multiple Sclerosis. Int J Infect Dis 2008. [DOI: 10.1016/j.ijid.2008.05.1295] [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] Open
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22
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Beutelspacher SC, Serbecic N, Mehrabi M, Völcker HE. Immunhistochemischer Nachweis einer verst�rkten Anreicherung von Isoprostan 8-epi-PGF2? in den Gef��l�sionen bei Arteriitis temporalis. Ophthalmologe 2004; 101:710-4. [PMID: 14999422 DOI: 10.1007/s00347-004-0995-3] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
BACKGROUND AND PURPOSE Oxidative injury caused by lipid oxidation is considered a major factor in the development of several ocular disorders including temporal arteritis. This study investigates the role of 8-epi-PGF2alpha as a marker of oxidative stress in vivo. PATIENTS AND METHODS Sections from isolated human temporal arteries, obtained from patients suspected of having giant cell arteritis ( n=22), were analyzed by semiquantitative immunohistochemistry and planimetry. RESULTS Immunoreactivity for 8-epi-PGF2alpha was significantly higher in patients with temporal arteritis (AT) compared to healthy temporal arteries (Co). The percentage of the areas stained positive in immunohistochemistry was higher in the AT group compared to the control group (Co). The enrichment values in the intimal layer containing the endothelium of the same temporal arteries were also significantly higher ( p<0.01) in temporal arteries of the AT group. CONCLUSIONS Our findings of an enhanced accumulation of 8-epi-PGF2alpha in areas of the arterial wall subjected to extensive vascular tissue destruction suggest that lipid peroxidation products may also play a role in the pathogenesis of this disease.
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Mahdavi R, Mehrabi M. Incisional hernia after renal transplantation and its repair with propylene mesh. Urol J 2004; 1:259-62. [PMID: 17914703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
PURPOSE Kidney recipients are susceptible to incisional hernia. We studied predisposing factors for incisional hernia in our patients and the results of its repair with propylene mesh. MATERIALS AND METHODS From 1989 to 2002, 589 patients had undergone kidney transplantation in our hospital. Of these, patients who developed incisional hernia were evaluated in this study. The following data were collected from their records: age, gender, weight, age at graft rejection, surgical complications, treatment method, and the treatment results with propylene mesh. RESULTS Of 589 recipients, 16 (3%) developed incisional hernia in surgical site. The median interval between kidney transplantation and developing of incisional hernia was 48 (range 12 to 425) days. Predisposing factors were overweight, age over fifty years, and female gender (P <0.005). In four patients, hernia was small, and the repair was performed without using mesh. Three patients were reluctant to hernia repair, and in 9, due to the large size of hernia, repair was done using propylene mesh. Having these 9 patients treated with propylene mesh, 2 developed serous collection in surgical site, which were managed successfully with multiple punctures. Hernia recurrence or infection was not noted in these patients during 3 to 36 months follow-up periods. CONCLUSION Incisional hernia is not a rare entity after kidney transplantation. Predisposing factors, such as overweight, age over 50 years, and female gender have a role in its development. Also, repeated surgeries in kidney recipients can increase the risk of incisional hernia. Managing this complication with propylene mesh is a safe and effective method.
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Affiliation(s)
- R Mahdavi
- Department of Urology, Imam Reza Hospital, Mashhad University of Medical Sciences, Mashhad, Iran.
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Beutelspacher SC, Serbecic N, Tamaddon F, Mehrabi M, Völcker HE. Immunhistochemischer Nachweis ver�nderter Low-density-Lipoproteine (ox-LDL) in der Gef��wand bei Patienten mit Arteriitis temporalis. Ophthalmologe 2003; 100:955-9. [PMID: 14669031 DOI: 10.1007/s00347-003-0818-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [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: 11/30/2022]
Abstract
BACKGROUND AND PURPOSE Recent data indicate that lipid peroxidation is implicated in the pathogenesis of giant cell arteritis with a close anatomic relationship between reactive oxygen species and oxidatively injured vascular tissue. PATIENTS AND METHODS Immunohistochemistry utilizing anti-ox-LDL was performed on paraffin sections of isolated temporal arteries obtained from patients (n=23) suspected of having temporal arteritis. Enrichment as well as staining intensity of ox-LDL in vascular tissue was analysed by digital image planimetry. RESULTS Temporal arteries with biopsy proven temporal arteritis (n=11) presented with significantly higher enrichment of ox-LDL in the intima (16.9+/-4.2% vs. 11.25+/-2.3%; p<0.01) and mean (9.6+/-2.4% vs. 6.75+/-1.8%; p<0.01) as compared to healthy controls. Comparable results for the staining intensity were found in the intimal (2.8+/-0.5 eU vs. 1.7+/-0.4 eU; p<0.01) and medial layer (1.55+/-0.5 eU vs. 1.04+/-0.6 eU; p<0.01) of diseased patients compared to controls. CONCLUSIONS Accumulation of ox-LDL in the intimal layer, especially at the intima-media-border, was closely related to disruption of the elastica interna and adjacent vascular tissue, presumably contributing to the underlying process of intimal hyperplasia through unimpeded migration of smooth muscle and accumulation inflammatory cells.
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Oguogho A, Mehrabi M, Sinzinger H. Increased plasma, serum and urinary 8-epi-prostaglandin F2 alpha in heterozygous hypercholesterolemia. Wien Klin Wochenschr 1999; 111:113-8. [PMID: 10093893] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
Oxidation injury results in foam cell formation, which is known to be a central mechanism in atherogenesis. We investigated in this study whether 8-epi-prostaglandin (PG) F2 alpha, an in vivo indicator of oxidative stress, is elevated in hyperlipoproteinemia. The isoprostane 8-epi-PGF2 alpha levels in plasma, serum and urine were determined in 123 patients (67 m, 56 f; 17-60 years) suffering from familial heterozygous hypercholesterolemia (FH). A group of 99 normocholesterolemic adults (51 m, 48 f; 20-63 years) served as controls. Plasma, serum and urine levels of 8-epi-PGF2 alpha were significantly (p < 0.01) higher in the FH group. Smokers showed elevated 8-epi-PGF2 alpha levels; however, no correlation was observed to hypertension, age and sex. Successful dietary and drug treatment of FH patients resulted in a significant decrease in 8-epi-PGF2 alpha levels in plasma, serum and urine. These findings indicate that FH is associated with increased oxidation injury, which is beneficially influenced by successful dietary and/or drug treatment.
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Affiliation(s)
- A Oguogho
- Department of Nuclear Medicine, University of Vienna, Austria
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Baumgartner H, Porenta G, Lau YK, Wutte M, Klaar U, Mehrabi M, Siegel RJ, Czernin J, Laufer G, Sochor H, Schelbert H, Fishbein MC, Maurer G. Assessment of myocardial viability by dobutamine echocardiography, positron emission tomography and thallium-201 SPECT: correlation with histopathology in explanted hearts. J Am Coll Cardiol 1998; 32:1701-8. [PMID: 9822099 DOI: 10.1016/s0735-1097(98)00436-7] [Citation(s) in RCA: 91] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
OBJECTIVES We examined the relationship among viability assessment by dobutamine echocardiography (DE), positron emission tomography (PET) and thallium-201 single-photon emission computed tomography (TI-SPECT) to the degree of fibrosis. BACKGROUND DE, PET and TI-SPECT have been shown to be sensitive in identifying viability of asynergic myocardium. However, PET and TI-SPECT indicated viability in a significant percentage of segments without dobutamine response or functional improvement after revascularization. METHODS Twelve patients with coronary artery disease and severely reduced left ventricular function (EF 14.5+/-5.2%) were studied with DE prior to cardiac transplantation: 5 had additional PET and 7 had TI-SPECT studies. Results of the three techniques were compared to histologic findings of the explanted hearts. RESULTS Segments with >75% viable myocytes by histology were determined to be viable in 78%, 89% and 87% by DE, PET and TI-SPECT; those with 50-75% viable myocytes in 71%, 50% and 87%, respectively. Segments with 25-50% viable myocytes showed response to dobutamine in only 15%, but were viable in 60% by PET and 82% by TI-SPECT. Segments with <25% viable myocytes responded to dobutamine in 19%; however, PET and TI-SPECT demonstrated viability in 33% and 38%, respectively. Discrepant segments without dobutamine response but viability by PET and SPECT had significantly more viable myocytes by pathology than did those classified in agreement to be nonviable but had significantly less viable myocytes than those classified in agreement to be viable (p < .001). CONCLUSIONS These findings suggest that contractile reserve as evidenced by a positive dobutamine response requires at least 50% viable myocytes in a given segment whereas scintigraphic methods also identify segments with less viable myocytes. Thus, the methods may provide complementary information: Nuclear techniques appear to be highly sensitive for the detection of myocardial viability, and negative tests make it highly unlikely that a significant number of viable myocytes are present in a given segment. Conversely, dobutamine echo may be particularly useful for predicting recovery of systolic function after revascularization.
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Affiliation(s)
- H Baumgartner
- Department of Cardiology, Vienna General Hospital, University of Vienna, Wien, Austria
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Klappacher G, Franzen P, Haab D, Mehrabi M, Binder M, Plesch K, Pacher R, Grimm M, Pribill I, Eichler HG. Measuring extracellular matrix turnover in the serum of patients with idiopathic or ischemic dilated cardiomyopathy and impact on diagnosis and prognosis. Am J Cardiol 1995; 75:913-8. [PMID: 7733000 DOI: 10.1016/s0002-9149(99)80686-9] [Citation(s) in RCA: 187] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Circulating levels of extracellular matrix components were measured by radioimmunoassays and tested if they were useful for clinical staging in chronic heart failure. In 41 patients with dilated cardiomyopathy (33 idiopathic and 8 ischemic cases), the serum concentrations of procollagen type III aminoterminal peptide (PIIINP), type I collagen telopeptide (ICTP), and basement membrane laminin were significantly higher than in 30 healthy controls regardless of the underlying etiology. Patients with serum values of PIIINP, ICTP, and laminin > 7 micrograms/L, 7.6 micrograms/L, and 2.3 U/ml, respectively, were at higher relative risk for advanced clinical stage, poor hemodynamic condition, hyponatremia, heart transplantation, and death during follow-up than patients with low levels, with the exception that serum laminin > 2.3 U/ml was not significantly associated with hyponatremia and heart transplantation. Despite their interdependence on liver function, circulating levels of PIIINP and ICTP were independent predictors of mortality. In 17 of the 41 patients with cardiomyopathy whose explanted hearts were available for histologic evaluation, serum PIIINP, ICTP, and laminin significantly correlated with the myocardial area fractions of their tissue analogues (PIIINP vs myocardial collagen type III, r = 0.784, p = 0.0013; serum ICTP vs myocardial collagen type I, r = 0.603, p = 0.0527; and serum laminin vs myocardial laminin, r = 0.605, p = 0.0411). In conclusion, the increase in extracellular matrix turnover, which may partially be derived from fibrosis in the myocardium, can be measured in the serum of patients with dilated cardiomyopathy, and has an impact on risk stratification and prognosis.
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Affiliation(s)
- G Klappacher
- Department of Cardiology, University of Vienna, Austria
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Klappacher G, Mehrabi M, Franzen P, Plesch K, Binder M, Haab D, Urban S, Laufer G, Glogar HD, Eichler HG. Endomyocardial HLA expression is increased to the same extent in idiopathic and secondary dilated cardiomyopathy. Immunol Lett 1994; 41:59-66. [PMID: 7959904 DOI: 10.1016/0165-2478(94)90057-4] [Citation(s) in RCA: 5] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
In a total of 22 failing hearts from human transplant recipients, the expression of major histocompatibility complex (MHC) molecules, the CD phenotype of infiltrating mononuclear cells, and the number of fibroblasts were analyzed by immunohistochemistry. Compared with 10 non-failing control hearts, significantly higher morphometric area fractions of HLA-ABC and HLA-DR with a concomitant increase of CD3-, CD4- and CD8-positive cells were found to be comparable in 12 patients with idiopathic dilated cardiomyopathy and in 10 patients with secondary heart failure. Furthermore, the similarity of T-cell activation in idiopathic and secondary variants of the disease were substantiated by the following observations: (1) the site-specific distribution of MHC molecules and mononuclear cells in the myocardium was comparable in idiopathic and secondary dilated cardiomyopathy; (2) 6 individuals with lymphocytic aggregates in their myocardium in association with the highest levels of HLA-ABC expression were equally distributed among idiopathic and secondary patient subsets; and (3) expression of HLA-ABC and HLA-DR correlated with that of an endothelial cell marker, von Willebrand factor, in failing myocardia of both study groups. In conclusion, no difference was found in increased MHC molecule expression in failing myocardium of idiopathic and secondary variants of dilated cardiomyopathy, and these entities were not differentially associated with infiltration by increased numbers of T lymphocytes. Hence, we postulate that these immunopathological features are consequences rather than causative factors of myocardial degeneration and dilatation.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- G Klappacher
- Department of Clinical Pharmacology, University of Vienna, Austria
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Klappacher G, Mehrabi M, Plesch K, Mundigler G, Pec M, Kramer G, Pacher R, Ullrich R, Kukutschki W, Imhof M. Serum-soluble CD4 as clinical and immunological marker in patients with dilated cardiomyopathy. Immunol Lett 1993; 38:103-9. [PMID: 8294137 DOI: 10.1016/0165-2478(93)90174-z] [Citation(s) in RCA: 5] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Serological markers of cell-mediated immunity, i.e., soluble CD4, soluble interleukin-2 (Il-2) receptor and beta 2-microglobulin, were determined in 60 patients with dilated cardiomyopathy. Compared with normal healthy donors (n = 30) and controls who had coronary artery disease with preserved left ventricular function (n = 20), significantly increased levels associated with the New York Heart Association functional classes have been found in the cardiomyopathy patients, irrespectively of the etiology. Out of the immunological variables tested, serum-soluble CD4 most closely reflected the clinical and hemodynamic stage, predicted the presence of lymphocytic aggregates in the myocardium and correlated with the CD4/CD8 ratios of endomyocardial lymphocytes (r = 0.6, P < 0.05). Conversely, focal mononuclear infiltration of the myocardium was associated with significantly elevated CD4/CD8 ratios (2.1 +/- 0.6 vs. 1.3 +/- 0.2, P < 0.05), higher total numbers and percentages of endomyocardial lymphocytes expressing the pan T-markers CD2 and CD3, more CD45RO/UCHL1-positive cells and more CD4-positive T-helper cells, compared with non-reactive cases the lymphocytes of which were scattered throughout the myocardium. In conclusion, in a subset of cardiomyopathy patients lymphocytic clusters in the myocardium indicated an enhanced cellular immune response predominantly mediated by CD4-positive T-helper lymphocytes with active memory function. This immunopathological condition in the heart can be monitored by serum-soluble CD4.
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Affiliation(s)
- G Klappacher
- Department of Clinical Pharmacology, University of Vienna, Austria
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