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Andersen P, Barksdale S, Barclay RA, Smith N, Fernandes J, Besse K, Goldfarb D, Barbero R, Dunlap R, Jones-Roe T, Kelly R, Miao S, Ruhunusiri C, Munns A, Mosavi S, Sanson L, Munns D, Sahoo S, Swahn O, Hull K, White D, Kolb K, Noroozi F, Seelam J, Patnaik A, Lepene B. Magnetic hydrogel particles improve nanopore sequencing of SARS-CoV-2 and other respiratory viruses. Sci Rep 2023; 13:2163. [PMID: 36750714 PMCID: PMC9903261 DOI: 10.1038/s41598-023-29206-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Accepted: 01/31/2023] [Indexed: 02/09/2023] Open
Abstract
Presented here is a magnetic hydrogel particle enabled workflow for capturing and concentrating SARS-CoV-2 from diagnostic remnant swab samples that significantly improves sequencing results using the Oxford Nanopore Technologies MinION sequencing platform. Our approach utilizes a novel affinity-based magnetic hydrogel particle, circumventing low input sample volumes and allowing for both rapid manual and automated high throughput workflows that are compatible with Nanopore sequencing. This approach enhances standard RNA extraction protocols, providing up to 40 × improvements in viral mapped reads, and improves sequencing coverage by 20-80% from lower titer diagnostic remnant samples. Furthermore, we demonstrate that this approach works for contrived influenza virus and respiratory syncytial virus samples, suggesting that it can be used to identify and improve sequencing results of multiple viruses in VTM samples. These methods can be performed manually or on a KingFisher automation platform.
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Affiliation(s)
- P Andersen
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA.
| | - S Barksdale
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA
| | - R A Barclay
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA
| | - N Smith
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA
| | - J Fernandes
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA
| | - K Besse
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA
| | - D Goldfarb
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA
| | - R Barbero
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA
| | - R Dunlap
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA
| | - T Jones-Roe
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA
| | - R Kelly
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA
| | - S Miao
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA
| | - C Ruhunusiri
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA
| | - A Munns
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA
| | - S Mosavi
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA
| | - L Sanson
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA
| | - D Munns
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA
| | - S Sahoo
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA
| | - O Swahn
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA
| | - K Hull
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA
| | - D White
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA
| | - K Kolb
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA
| | - F Noroozi
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA
| | - J Seelam
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA
| | - A Patnaik
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA
| | - B Lepene
- Ceres Nanosciences, Inc., Manassas, VA, 20110, USA.
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Terkeltaub R, Clark D, Tosone C, Kandinov B, Zhang P, Dahl N, Grujic D, Goldfarb D. POS1157 SAFETY AND EFFICACY OF ALLN-346 ORAL ENZYME THERAPY IN PATIENTS WITH HYPERURICEMIA AND CHRONIC KIDNEY DISEASE (CKD): RESULTS OF THE PHASE 2A STUDY 201. Ann Rheum Dis 2022. [DOI: 10.1136/annrheumdis-2022-eular.1662] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BackgroundCurrently available urate lowering therapies (ULTs) are limited in their use for gout patients with advanced CKD based on dosing restrictions, tolerability, safety concerns, and reduced effectiveness, compared to options for the broader gout population. In gout patients with advanced CKD, the intestinal tract becomes the major route of urate elimination, as opposed to in healthy people with normal kidney function where kidneys are the primary route of uric acid excretion.1 Considering some of the limitations of present urate-lowering therapies (ULTs) in gout & CKD and the extra-renal pathway of urate secretion, a new oral therapy, ALLN-346 (engineered urate oxidase), is under development as a non-absorbed, urate specific enzyme, designed to enhance degradation and secretion of urate in the intestinal tract.2ObjectivesTo assess the safety, tolerability, and initial bioactivity data of ALLN-346 in adults with hyperuricemia and CKD.MethodsThis one-week inpatient Phase 2a study (NCT04987242) was conducted at a clinical pharmacology unit. Eleven otherwise healthy adult patients with hyperuricemia (sUA ≥ 6.8 mg/dL) and normal to Stage 2 CKD (eGFR ≥60), not on concurrent ULTs, were randomized (2:1) to receive either 5 capsules of ALLN-346 or matching placebo, three times daily for 7 days. Serum urate was measured daily, and urine uric acid was assessed on days -2, -1, 1, 4, and 7. Safety was monitored throughout the study. To assess possible ALLN-346 systemic absorption, a specific ELISA was used on serum samples collected pre- and post-dose over 7 days.ResultsOf the 11 patients 7 received ALLN-346 and 4 received placebo. Most patients had Stage 2 CKD, including 5 of the 7 subjects treated with ALLN-346. A statistically significant reduction in mean sUA was recorded with ALLN-346 compared to placebo [Figure 1]. The largest mean % reduction in sUA was observed among patients with stage 2 CKD; sUA reduction was correlated with eGFR in the ALLN-346 group (r=0.95; P=0.003), but not the placebo group (r=-0.2; P=0.91). No serious adverse events were reported, and clinical and laboratory parameters revealed no significant safety signals. Lack of systemic absorption of ALLN-346 was confirmed by ELISA assays.Figure 1.Absolute and Percent Change from Baseline in Serum Urate over 7 -days of TreatmentConclusionIn this study, oral therapy with ALLN-346 for 7 days was well tolerated and resulted in a significant reduction in sUA. Consistent with the known pathophysiologic adaptation of increased intestinal elimination of uric acid in patients with impaired kidney function and the intestinal-based mechanism of action of ALLN-346, there was a strong correlation between the effect of ALLN-346 on sUA reduction and the level of kidney function. The generated data support proof of pharmacology for the intestinal mechanism of action of ALLN-346 to degrade urate either formed or secreted in the gut. Future studies in the larger gout population with CKD are underway.References[1]Sorensen BL. Role of the intestinal tract in the elimination of uric acid. Arthritis and Rheumatism, vol 8, part5 1965[2]Pierzynowska K, Deshpande A, Mosiichuk N, et al. Oral Treatment with an Engineered Uricase, ALLN-346, Reduces Hyperuricemia, and Uricosuria in Urate Oxidase-Deficient Mice. Front Med (Lausanne). 2020 Nov 24;7:569215.Disclosure of InterestsRobert Terkeltaub Consultant of: Allena, SOBI, Astra-Zeneca, Fortress, Grant/research support from: Astra-Zeneca, David Clark Shareholder of: Allena, Employee of: Allena, Christine Tosone Shareholder of: Allena, Employee of: Allena, Boris Kandinov Shareholder of: Allena, Employee of: Allena, Ping Zhang Shareholder of: Corbus, Employee of: Previous Corbus, Current Allena, Naomi Dahl Shareholder of: AbbVie shares, Allena options, Employee of: Allena, Danica Grujic Shareholder of: Allena, Employee of: Allena, David Goldfarb Consultant of: Allena, Alnylam, AstraZeneca, Cymabay, Dicerna, Sumitovant, Synlogic, Grant/research support from: Dicerna, Travere
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Von Seth M, Hillered L, Otterbeck A, Hanslin K, Larsson A, Sjölin J, Lipcsey M, Cove ME, Chew NS, Vu LH, Lim RZ, Puthucheary Z, Hanslin K, Wilske F, Skorup P, Tano E, Sjölin J, Lipcsey M, Derese I, Thiessen S, Derde S, Dufour T, Pauwels L, Bekhuis Y, Van den Berghe G, Vanhorebeek I, Khan M, Dwivedi D, Zhou J, Prat A, Seidah NG, Liaw PC, Fox-Robichaud AE, Von Seth M, Skorup P, Hillered L, Larsson A, Sjölin J, Lipcsey M, Otterbeck A, Hanslin K, Lipcsey M, Larsson A, Von Seth M, Correa T, Pereira J, Takala J, Jakob S, Skorup P, Maudsdotter L, Tano E, Lipcsey M, Castegren M, Larsson A, Sjölin J, Xue M, Xu JY, Liu L, Huang YZ, Guo FM, Yang Y, Qiu HB, Kuzovlev A, Moroz V, Goloubev A, Myazin A, Chumachenko A, Pisarev V, Takeyama N, Tsuda M, Kanou H, Aoki R, Kajita Y, Hashiba M, Terashima T, Tomino A, Davies R, O’Dea KP, Soni S, Ward JK, O’Callaghan DJ, Takata M, Gordon AC, Wilson J, Zhao Y, Singer M, Spencer J, Shankar-Hari M, Genga KR, Lo C, Cirstea MS, Walley KR, Russell JA, Linder A, Boyd JH, Sedlag A, Riedel C, Georgieff M, Barth E, Debain A, Jonckheer J, Moeyersons W, Van zwam K, Puis L, Staessens K, Honoré PM, Spapen HD, De Waele E, de Garibay APR, Bracht H, Ende-Schneider B, Schreiber C, Kreymann B, Bini A, Votino E, Giuliano G, Steinberg I, Vetrugno L, Trunfio D, Sidoti A, Essig A, Brogi E, Forfori F, Conroy M, Marsh B, O’Flynn J, Henne-Bruns D, Gebhard F, Orend K, Halatsch M, Weiss M, Chase M, Freinkman E, Uber A, Liu X, Cocchi MN, Donnino MW, Peetermans M, Liesenborghs L, Claes J, Vanassche T, Hoylaerts M, Jacquemin M, Vanhoorelbeke K, De Meyer S, Verhamme P, Vögeli A, Ottiger M, Meier M, Steuer C, Bernasconi L, Huber A, Christ-Crain M, Henzen C, Hoess C, Thomann R, Zimmerli W, Müller B, Schütz P, Hoppensteadt D, Walborn A, Rondina M, Tsuruta K, Fareed J, Tachyla S, Ikeda T, Ono S, Ueno T, Suda S, Nagura T, Damiani E, Domizi R, Scorcella C, Tondi S, Pierantozzi S, Ciucani S, Mininno N, Adrario E, Pelaia P, Donati A, Andersen MS, Lu S, Lopez G, Lassen AT, Ghiran I, Shapiro NI, Trahtemberg U, Sviri S, Beil M, Agur Z, Van Heerden P, Jahaj E, Vassiliou A, Mastora Z, Orfanos SE, Kotanidou A, Wirz Y, Sager R, Amin D, Amin A, Haubitz S, Hausfater P, Huber A, Kutz A, Mueller B, Schuetz P, Sager RS, Wirz YW, Amin DA, Amin AA, Hausfater PH, Huber AH, Haubitz S, Kutz A, Mueller B, Schuetz P, Gottin L, Dell’amore C, Stringari G, Cogo G, Ceolagraziadei M, Sommavilla M, Soldani F, Polati E, Meier M, Baumgartner T, Zurauskaité G, Gupta S, Mueller B, Devendra A, Schuetz P, Mandaci D, Eren G, Ozturk F, Emir N, Hergunsel O, Azaiez S, Khedher S, Maaoui A, Salem M, Chernevskaya E, Beloborodova N, Bedova A, Sarshor YU, Pautova A, Gusarov V, Öveges N, László I, Forgács M, Kiss T, Hankovszky P, Palágyi P, Bebes A, Gubán B, Földesi I, Araczki Á, Telkes M, Ondrik Z, Helyes Z, Kemény Á, Molnár Z, Spanuth E, Ebelt H, Ivandic B, Thomae R, Werdan K, El-Shafie M, Taema K, El-Hallag M, Kandeel A, Tayeh O, Taema K, Eldesouky M, Omara A, Winkler MS, Holzmann M, Nierhaus A, Mudersbach E, Schwedhelm E, Daum G, Kluge S, Zoellner C, Greiwe G, Sawari H, Schwedhelm E, Nierhaus A, Kluge S, Kubitz J, Jung R, Daum G, Reichenspurner H, Zoellner C, Winkler MS, Groznik M, Ihan A, Andersen LW, Chase M, Holmberg MJ, Wulff A, Cocchi MN, Donnino MW, Balci C, Haliloglu M, Bilgili B, Bilgin H, Kasapoglu U, Sayan I, Süzer M, Mulazımoglu L, Cinel I, Patel V, Shah S, Parulekar P, Minton C, Patel J, Ejimofo C, Choi H, Costa R, Caruso P, Nassar P, Fu J, Jin J, Xu Y, Kong J, Wu D, Yaguchi A, Klonis A, Ganguly S, Kollef M, Burnham C, Fuller B, Mavrommati A, Chatzilia D, Salla E, Papadaki E, Kamariotis S, Christodoulatos S, Stylianakis A, Alamanos G, Simoes M, Trigo E, Silva N, Martins P, Pimentel J, Baily D, Curran LA, Ahmadnia E, Patel BV, Adukauskiene D, Cyziute J, Adukauskaite A, Pentiokiniene D, Righetti F, Colombaroli E, Castellano G, Wilske F, Skorup P, Lipcsey M, Hanslin K, Larsson A, Sjölin J, Man M, Shum HP, Chan YH, Chan KC, Yan WW, Lee RA, Lau SK, Dilokpattanamongkol P, Thirapakpoomanunt P, Anakkamaetee R, Montakantikul P, Tangsujaritvijit V, Sinha S, Pati J, Sahu S, Adukauskiene D, Valanciene D, Dambrauskiene A, Adukauskiene D, Valanciene D, Dambrauskiene A, Hernandez K, Lopez T, Saca D, Bello M, Mahmood W, Hamed K, Al Badi N, AlThawadi S, Al Hosaini S, Salahuddin N, Cilloniz CC, Ceccato AC, Bassi GLL, Ferrer MF, Gabarrus AG, Ranzani OR, Jose ASS, Vidal CGG, de la Bella Casa JPP, Blasi FB, Torres AT, Adukauskiene D, Ciginskiene A, Dambrauskiene A, Simoliuniene R, Giuliano G, Triunfio D, Sozio E, Taddei E, Brogi E, Sbrana F, Ripoli A, Bertolino G, Tascini C, Forfori F, Fleischmann C, Goldfarb D, Schlattmann P, Schlapbach L, Kissoon N, Baykara N, Akalin H, Arslantas MK, Gavrilovic SG, Vukoja MV, Hache MH, Kashyap RK, Dong YD, Gajic OG, Ranzani O, Shankar-Hari M, Harrison D, Rabello L, Rowan K, Salluh J, Soares M, Markota AM, Fluher JF, Kogler DK, Borovšak ZB, Sinkovic AS, László I, Öveges N, Forgács M, Kiss T, Hankovszky P, Palágyi P, Bebes A, Gubán B, Földesi I, Araczki Á, Telkes M, Ondrik Z, Helyes Z, Kemény Á, Molnár Z, Fareed J, Siddiqui Z, Aggarwal P, Iqbal O, Hoppensteadt D, Lewis M, Wasmund R, Abro S, Raghuvir S, Tsuruta K, Barie PS, Fineberg D, Radford A, Tsuruta K, Casazza A, Vilardo A, Bellazzi E, Boschi R, Ciprandi D, Gigliuto C, Preda R, Vanzino R, Vetere M, Carnevale L, Kyriazopoulou E, Pistiki A, Routsi C, Tsangaris I, Giamarellos-Bourboulis E, Kyriazopoulou E, Tsangaris I, Routsi C, Pnevmatikos I, Vlachogiannis G, Antoniadou E, Mandragos K, Armaganidis A, Giamarellos-Bourboulis E, Allan P, Oehmen R, Luo J, Ellis C, Latham P, Newman J, Pritchett C, Pandya D, Cripps A, Harris S, Jadav M, Langford R, Ko B, Park H, Beumer CM, Koch R, Beuningen DV, Oudelashof AM, Vd Veerdonk FL, Kolwijck E, VanderHoeven JG, Bergmans DC, Hoedemaekers C, Brandt JB, Golej J, Burda G, Mostafa G, Schneider A, Vargha R, Hermon M, Levin P, Broyer C, Assous M, Wiener-Well Y, Dahan M, Benenson S, Ben-Chetrit E, Faux A, Sherazi R, Sethi A, Saha S, Kiselevskiy M, Gromova E, Loginov S, Tchikileva I, Dolzhikova Y, Krotenko N, Vlasenko R, Anisimova N, Spadaro S, Fogagnolo A, Remelli F, Alvisi V, Romanello A, Marangoni E, Volta C, Degrassi A, Mearelli F, Casarsa C, Fiotti N, Biolo G, Cariqueo M, Luengo C, Galvez R, Romero C, Cornejo R, Llanos O, Estuardo N, Alarcon P, Magazi B, Khan S, Pasipanodya J, Eriksson M, Strandberg G, Lipsey M, Larsson A, Rajput Z, Hiscock F, Karadag T, Uwagwu J, Jain S, Molokhia A, Barrasa H, Soraluce A, Uson E, Rodriguez A, Isla A, Martin A, Fernández B, Fonseca F, Sánchez-Izquierdo JA, Maynar FJ, Kaffarnik M, Alraish R, Frey O, Roehr A, Stockmann M, Wicha S, Shortridge D, Castanheira M, Sader HS, Streit JM, Flamm RK, Falsetta K, Lam T, Reidt S, Jancik J, Kinoshita T, Yoshimura J, Yamakawa K, Fujimi S, Armaganidis A, Torres A, Zakynthinos S, Mandragos C, Giamarellos-Bourboulis E, Ramirez P, De la Torre-Prados M, Rodriguez A, Dale G, Wach A, Beni L, Hooftman L, Zwingelstein C, François B, Colin G, Dequin PF, Laterre PF, Perez A, Welte R, Lorenz I, Eller P, Joannidis M, Bellmann R, Lim S, Chana S, Patel S, Higuera J, Cabestrero D, Rey L, Narváez G, Blandino A, Aroca M, Saéz S, De Pablo R, Thiessen S, Vanhorebeek I, Derde S, Derese I, Dufour T, Albert CN, Langouche L, Goossens C, Peersman N, Vermeersch P, Vander Perre S, Holst J, Wouters P, Van den Berghe G, Liu X, Uber AU, Holmberg M, Konanki V, McNaughton M, Zhang J, Donnino MW, Demirkiran O, Byelyalov A, Luengo C, Guerrero J, Cariqueo M, Scorcella C, Domizi R, Damiani E, Tondi S, Pierantozzi S, Rossini N, Falanga U, Monaldi V, Adrario E, Pelaia P, Donati A, Cole O, Scawn N, Balciunas M, Blascovics I, Vuylsteke A, Salaunkey K, Omar A, Salama A, Allam M, Alkhulaifi A, Verstraete S, Vanhorebeek I, Van Puffelen E, Derese I, Ingels C, Verbruggen S, Wouters P, Joosten K, Hanot J, Guerra G, Vlasselaers D, Lin J, Van den Berghe G, Haines R, Zolfaghari P, Hewson R, Offiah C, Prowle J, Park H, Ko B, Buter H, Veenstra JA, Koopmans M, Boerma EC, Veenstra JA, Buter H, Koopmans M, Boerma EC, Taha A, Shafie A, Hallaj S, Gharaibeh D, Hon H, Bizrane M, El Khattate AA, Madani N, Abouqal R, Belayachi J, Kongpolprom N, Sanguanwong N, Sanaie S, Mahmoodpoor A, Hamishehkar H, Biderman P, Van Heerden P, Avitzur Y, Solomon S, Iakobishvili Z, Carmi U, Gorfil D, Singer P, Paisley C, Patrick-Heselton J, Mogk M, Humphreys J, Welters I, Pierantozzi S, Scorcella C, Domizi R, Damiani E, Tondi S, Casarotta E, Bolognini S, Adrario E, Pelaia P, Donati A, Holmberg MJ, Moskowitz A, Patel P, Grossestreuer A, Uber A, Andersen LW, Donnino MW, Malinverni S, Goedeme D, Mols P, Langlois PL, Szwec C, D’Aragon F, Heyland DK, Manzanares W, Manzanares W, Szwec C, Langlois P, Aramendi I, Heyland D, Stankovic N, Nadler J, Uber A, Holmberg M, Sanchez L, Wolfe R, Chase M, Donnino M, Cocchi M, Atalan HK, Gucyetmez B, Kavlak ME, Aslan S, Kargi A, Yazici S, Donmez R, Polat KY, Piechota M, Piechota A, Misztal M, Bernas S, Pietraszek-Grzywaczewska I, Saleh M, Hamdy A, Hamdy A, Elhallag M, Atar F, Kundakci A, Gedik E, Sahinturk H, Zeyneloglu P, Pirat A, Popescu M, Tomescu D, Van Gassel R, Baggerman M, Schaap F, Bol M, Nicolaes G, Beurskens D, Damink SO, Van de Poll M, Horibe M, Sasaki M, Sanui M, Iwasaki E, Sawano H, Goto T, Ikeura T, Hamada T, Oda T, Mayumi T, Kanai T, Kjøsen G, Horneland R, Rydenfelt K, Aandahl E, Tønnessen T, Haugaa H, Lockett P, Evans L, Somerset L, Ker-Reid F, Laver S, Courtney E, Dalton S, Georgiou A, Robinson K, Lam T, Haas B, Reidt S, Bartlett K, Jancik J, Bigwood M, Hanley R, Morgan P, Marouli D, Chatzimichali A, Kolyvaki S, Panteli A, Diamantaki E, Pediaditis E, Sirogianni P, Ginos P, Kondili E, Georgopoulos D, Askitopoulou H, Zampieri FG, Liborio AB, Besen BA, Cavalcanti AB, Dominedò C, Dell’Anna AM, Monayer A, Grieco DL, Barelli R, Cutuli SL, Maddalena AI, Picconi E, Sonnino C, Sandroni C, Antonelli M, Gucyetmez B, Atalan HK, Tuzuner F, Cakar N, Jacob M, Sahu S, Singh YP, Mehta Y, Yang KY, Kuo S, Rai V, Cheng T, Ertmer C, Czempik P, Hutchings S, Watts S, Wilson C, Burton C, Kirkman E, Drennan D, O’Prey A, MacKay A, Forrest R, Oglinda A, Ciobanu G, Casian M, Oglinda C, Lun CT, Yuen HJ, Ng G, Leung A, So SO, Chan HS, Lai KY, Sanguanwit P, Charoensuk W, Phakdeekitcharoen B, Batres-Baires G, Kammerzell I, Lahmer T, Mayr U, Schmid R, Huber W, Spanuth E, Bomberg H, Klingele M, Thomae R, Groesdonk H, Bernas S, Piechota M, Mirkiewicz K, Pérez AG, Silva J, Ramos A, Acharta F, Perezlindo M, Lovesio L, Antonelli PG, Dogliotti A, Lovesio C, Baron J, Schiefer J, Baron DM, Faybik P, Shum HP, Yan WW, Chan TM, Marouli D, Chatzimichali A, Kolyvaki S, Panteli A, Diamantaki E, Pediaditis E, Sirogianni P, Ginos P, Kondili E, Georgopoulos D, Askitopoulou H, Vicka V, Gineityte D, Ringaitiene D, Sipylaite J, Pekarskiene J, Beurskens DM, Van Smaalen TC, Hoogland P, Winkens B, Christiaans MH, Reutelingsperger CP, Van Heurn E, Nicolaes GA, Schmitt FS, Salgado ES, Friebe JF, Fleming TF, Zemva JZ, Schmoch TS, Uhle FU, Kihm LK, Morath CM, Nusshag CN, Zeier MZ, Bruckner TB, Mehrabi AM, Nawroth PN, Weigand MW, Hofer SH, Brenner TB, Fotopoulou G, Poularas I, Kokkoris S, Brountzos E, Zakynthinos S, Routsi C, Saleh M, Elghonemi M, Nilsson KF, Sandin J, Gustafsson L, Frithiof R, Skorniakov I, Varaksin A, Vikulova D, Shaikh O, Whiteley C, Ostermann M, Di Lascio G, Anicetti L, Bonizzoli M, Fulceri G, Migliaccio ML, Sentina P, Cozzolino M, Peris A, Khadzhynov D, Halleck F, Staeck O, Lehner L, Budde K, Slowinski T, Slowinski T, Kindgen-Milles D, Khadzhynov D, Huysmans N, Laenen MV, Helmschrodt A, Boer W. 37th International Symposium on Intensive Care and Emergency Medicine (part 3 of 3). Crit Care 2017. [PMCID: PMC5374592 DOI: 10.1186/s13054-017-1629-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Alyazidi R, Hickman R, Li L, Osowicki J, Goldfarb D, Tilley P, Speert D, Zlosnik J. Evaluation of the performance of randomly amplified polymorphic DNA (RAPD) method for microbiological typing in an invasive Serratia marcescens NICU outbreak. Int J Infect Dis 2016. [DOI: 10.1016/j.ijid.2016.11.331] [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] Open
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Schold JD, Buccini LD, Poggio ED, Flechner SM, Goldfarb DA. Association of Candidate Removals From the Kidney Transplant Waiting List and Center Performance Oversight. Am J Transplant 2016; 16:1276-84. [PMID: 26762606 DOI: 10.1111/ajt.13594] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Revised: 10/21/2015] [Accepted: 10/25/2015] [Indexed: 01/25/2023]
Abstract
Approximately 59 000 kidney transplant candidates have been removed from the waiting list since 2000 for reasons other than transplantation, death, or transfers. Prior studies indicate that low-performance (LP) center evaluations by the Scientific Registry of Transplant Recipients (SRTR) are associated with reductions in transplant volume. There is limited information to determine whether performance oversight impacts waitlist management. We used national SRTR data to evaluate outcomes of 315 796 candidates on the kidney transplant waiting list (2007-2014). Compared to centers without LP, rates of waitlist removal (WLR) were higher at centers with LP evaluations (44.6/1000 follow-up years, 95% confidence interval [CI] 44.0, 45.1 versus 68.0/1000 follow-up years, 95% CI 66.6, 69.4), respectively, which was consistent after risk adjustment (adjusted hazard ratio [AHR] = 1.59, 95% CI 1.55, 1.63). Candidate mortality following waitlist removal was lower at LP centers (AHR = 0.90, 95% CI 0.87, 0.94). Analyses limited to LP centers indicated a significant increase in WLR (+28.6 removals/1000 follow-up years, p < 0.001), a decrease in transplant rates (-11.9/1000 follow-up years, p < 0.001) and a decrease in mortality after removal (-67.5 deaths/1000 follow-up years, p < 0.001) following LP evaluation. There is a significant association between LP evaluations and transplant center processes of care for waitlisted candidates. Further understanding is needed to determine the impact of performance oversight on transplant center quality of care and patient outcomes.
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Affiliation(s)
- J D Schold
- Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, OH.,Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH
| | - L D Buccini
- Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH.,Digestive Disease Institute, Cleveland Clinic, Cleveland, OH
| | - E D Poggio
- Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH.,Glickman Urological and Kidney Institute, Cleveland Clinic, Cleveland, OH
| | - S M Flechner
- Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH.,Glickman Urological and Kidney Institute, Cleveland Clinic, Cleveland, OH
| | - D A Goldfarb
- Glickman Urological and Kidney Institute, Cleveland Clinic, Cleveland, OH
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6
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Collauto A, Feintuch A, Qi M, Godt A, Meade T, Goldfarb D. Gd(III) complexes as paramagnetic tags: Evaluation of the spin delocalization over the nuclei of the ligand. J Magn Reson 2016; 263:156-163. [PMID: 26802219 DOI: 10.1016/j.jmr.2015.12.025] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Revised: 12/28/2015] [Accepted: 12/30/2015] [Indexed: 05/15/2023]
Abstract
Complexes of the Gd(III) ion are currently being established as spin labels for distance determination in biomolecules by pulse dipolar spectroscopy. Because Gd(III) is an f ion, one expects electron spin density to be localized on the Gd(III) ion - an important feature for the mentioned application. Most of the complex ligands have nitrogens as Gd(III) coordinating atoms. Therefore, measurement of the (14)N hyperfine coupling gives access to information on the localization of the electron spin on the Gd(III) ion. We carried out W-band, 1D and 2D (14)N and (1)H ENDOR measurements on the Gd(III) complexes Gd-DOTA, Gd-538, Gd-595, and Gd-PyMTA that serve as spin labels for Gd-Gd distance measurements. The obtained (14)N spectra are particularly well resolved, revealing both the hyperfine and nuclear quadrupole splittings, which were assigned using 2D Mims ENDOR experiments. Additionally, the spectral contributions of the two different types of nitrogen atoms of Gd-PyMTA, the aliphatic N atom and the pyridine N atom, were distinguishable. The (14)N hyperfine interaction was found to have a very small isotropic hyperfine component of -0.25 to -0.37MHz. Furthermore, the anisotropic hyperfine interactions with the (14)N nuclei and with the non-exchangeable protons of the ligands are well described by the point-dipole approximation using distances derived from the crystal structures. We therefore conclude that the spin density is fully localized on the Gd(III) ion and that the spin density distribution over the nuclei of the ligands is rightfully ignored when analyzing distance measurements.
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Affiliation(s)
- A Collauto
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - A Feintuch
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - M Qi
- University Bielefeld, Faculty of Chemistry and Center for Molecular Materials, D-33615 Bielefeld, Germany
| | - A Godt
- University Bielefeld, Faculty of Chemistry and Center for Molecular Materials, D-33615 Bielefeld, Germany
| | - T Meade
- Department of Chemistry, Northwestern University, Evanston, IL 60208, USA
| | - D Goldfarb
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot 76100, Israel.
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7
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Collauto A, Frydman V, Lee MD, Abdelkader EH, Feintuch A, Swarbrick JD, Graham B, Otting G, Goldfarb D. RIDME distance measurements using Gd(iii) tags with a narrow central transition. Phys Chem Chem Phys 2016; 18:19037-49. [DOI: 10.1039/c6cp03299k] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Methods based on pulse electron paramagnetic resonance allow measurement of the electron–electron dipolar coupling between two high-spin labels.
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Affiliation(s)
- A. Collauto
- Department of Chemical Physics
- Weizmann Institute of Science
- Rehovot 7610001
- Israel
| | - V. Frydman
- Department of Chemical Research Support
- Weizmann Institute of Science
- Rehovot 7610001
- Israel
| | - M. D. Lee
- Monash Institute of Pharmaceutical Sciences
- Monash University
- Parkville
- Australia
| | - E. H. Abdelkader
- Research School of Chemistry
- Australian National University
- Canberra
- Australia
| | - A. Feintuch
- Department of Chemical Physics
- Weizmann Institute of Science
- Rehovot 7610001
- Israel
| | - J. D. Swarbrick
- Monash Institute of Pharmaceutical Sciences
- Monash University
- Parkville
- Australia
| | - B. Graham
- Monash Institute of Pharmaceutical Sciences
- Monash University
- Parkville
- Australia
| | - G. Otting
- Research School of Chemistry
- Australian National University
- Canberra
- Australia
| | - D. Goldfarb
- Department of Chemical Physics
- Weizmann Institute of Science
- Rehovot 7610001
- Israel
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8
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Schold JD, Buccini LD, Rodrigue JR, Mandelbrot D, Goldfarb DA, Flechner SM, Kayler LK, Poggio ED. Critical Factors Associated With Missing Follow-Up Data for Living Kidney Donors in the United States. Am J Transplant 2015; 15:2394-403. [PMID: 25902877 DOI: 10.1111/ajt.13282] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [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: 11/18/2014] [Revised: 01/25/2015] [Accepted: 02/11/2015] [Indexed: 01/25/2023]
Abstract
Follow-up care for living kidney donors is an important responsibility of the transplant community. Prior reports indicate incomplete donor follow-up information, which may reflect both donor and transplant center factors. New UNOS regulations require reporting of donor follow-up information by centers for 2 years. We utilized national SRTR data to evaluate donor and center-level factors associated with completed follow-up for donors 2008-2012 (n = 30 026) using multivariable hierarchical logistic models. We compared center follow-up compliance based on current UNOS standards using adjusted and unadjusted models. Complete follow-up at 6, 12, and 24 months was 67%, 60%, and 50% for clinical and 51%, 40%, and 30% for laboratory data, respectively, but have improved over time. Donor risk factors for missing laboratory data included younger age 18-34 (adjusted odds ratio [AOR] = 2.03, 1.58-2.60), black race (AOR = 1.17, 1.05-1.30), lack of insurance (AOR = 1.25, 1.15-1.36), lower educational attainment (AOR = 1.19, 1.06-1.34), >500 miles to center (AOR = 1.78, 1.60-1.98), and centers performing >40 living donor transplants/year (AOR = 2.20, 1.21-3.98). Risk-adjustment moderately shifted classification of center compliance with UNOS standards. There is substantial missing donor follow-up with marked variation by donor characteristics and centers. Although follow-up has improved over time, targeted efforts are needed for donors with selected characteristics and at centers with higher living donor volume. Adding adjustment for donor factors to policies regulating follow-up may function to provide more balanced evaluation of center efforts.
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Affiliation(s)
- J D Schold
- Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, OH.,Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH
| | - L D Buccini
- Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, OH.,Digestive Disease Institute, Cleveland Clinic, Cleveland, OH
| | - J R Rodrigue
- Beth Israel Deaconess Medical Center, Boston, MA
| | | | - D A Goldfarb
- Glickman Urological and Kidney Institute, Cleveland Clinic, Cleveland, OH
| | - S M Flechner
- Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH.,Glickman Urological and Kidney Institute, Cleveland Clinic, Cleveland, OH
| | | | - E D Poggio
- Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH.,Glickman Urological and Kidney Institute, Cleveland Clinic, Cleveland, OH
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9
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Hovav Y, Shimon D, Kaminker I, Feintuch A, Goldfarb D, Vega S. Effects of the electron polarization on dynamic nuclear polarization in solids. Phys Chem Chem Phys 2015; 17:6053-65. [DOI: 10.1039/c4cp05625f] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The effect of the electron polarization distribution on the DNP line-shapes: theory and a demonstration on a 40 mM TEMPOL sample.
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Affiliation(s)
- Y. Hovav
- Weizmann institute of Science
- Rehovot
- Israel
| | - D. Shimon
- Weizmann institute of Science
- Rehovot
- Israel
| | | | | | | | - S. Vega
- Weizmann institute of Science
- Rehovot
- Israel
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10
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Hovav Y, Kaminker I, Shimon D, Feintuch A, Goldfarb D, Vega S. The electron depolarization during dynamic nuclear polarization: measurements and simulations. Phys Chem Chem Phys 2015; 17:226-44. [DOI: 10.1039/c4cp03825h] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Measurements and simulations of the electron spin polarization along the EPR spectrum of TEMPOL and trityl radicals, under DNP conditions.
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Affiliation(s)
- Y. Hovav
- Weizmann Institute of Science
- Rehovot
- Israel
| | | | - D. Shimon
- Weizmann Institute of Science
- Rehovot
- Israel
| | | | | | - S. Vega
- Weizmann Institute of Science
- Rehovot
- Israel
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11
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Abdelkader EH, Feintuch A, Yao X, Adams LA, Aurelio L, Graham B, Goldfarb D, Otting G. Protein conformation by EPR spectroscopy using gadolinium tags clicked to genetically encoded p-azido-l-phenylalanine. Chem Commun (Camb) 2015; 51:15898-901. [DOI: 10.1039/c5cc07121f] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
First example of gadolinium tags attached to a pair of unnatural amino acids for distance measurements by double electron–electron resonance.
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Affiliation(s)
- E. H. Abdelkader
- Research School of Chemistry
- Australian National University
- Canberra
- Australia
| | - A. Feintuch
- Department of Chemical Physics
- Weizmann Institute of Science
- Rehovot 76100
- Israel
| | - X. Yao
- Research School of Chemistry
- Australian National University
- Canberra
- Australia
| | - L. A. Adams
- Monash Institute of Pharmaceutical Sciences
- Monash University
- Parkville VIC 3052
- Australia
| | - L. Aurelio
- Monash Institute of Pharmaceutical Sciences
- Monash University
- Parkville VIC 3052
- Australia
| | - B. Graham
- Monash Institute of Pharmaceutical Sciences
- Monash University
- Parkville VIC 3052
- Australia
| | - D. Goldfarb
- Department of Chemical Physics
- Weizmann Institute of Science
- Rehovot 76100
- Israel
| | - G. Otting
- Research School of Chemistry
- Australian National University
- Canberra
- Australia
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12
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Schold JD, Buccini LD, Reese PP, Poggio ED, Goldfarb DA. Effect of dialysis initiation for preemptively listed candidates in the revised kidney allocation policy. Am J Transplant 2014; 14:2855-60. [PMID: 25278446 DOI: 10.1111/ajt.12957] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Revised: 07/27/2014] [Accepted: 08/03/2014] [Indexed: 01/25/2023]
Abstract
The new allocation policy for deceased donor kidneys in the United States is expected to begin in late 2014. As part of this policy, prioritization to the highest quality deceased donor kidneys is dependent on candidate's estimated posttransplant survival (EPTS) score. In particular, candidates with low (≤20%) EPTS (indicating better estimated survival) will have greater access to donor offers. We evaluated the effect of dialysis initiation on preemptively listed candidates' EPTS score. Using current estimates, approximately 10% (n = 19,406) of candidates placed on the waiting list between 2008 and 2013 were listed preemptively and would have qualified for top 20% status. These patients were more likely younger, female, Caucasian and nondiabetic compared to other candidates. Among nondiabetic preemptively listed candidates, dialysis initiation decreases EPTS score (indicating better estimated survival and higher allocation priority) for approximately 5 months. In contrast, diabetic patients' EPTS score significantly increases (approximately 6%) immediately upon dialysis initiation. Our results reveal a counterintuitive aberration in the EPTS formula, which is important for decision making regarding organ selection and timing of dialysis initiation in the new allocation system. Revision of the EPTS formula should be considered to address these findings and further understanding of the impact of the new allocation system on candidates' prognosis is important.
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Affiliation(s)
- J D Schold
- Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, OH; Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH
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13
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Raitsimring A, Dalaloyan A, Collauto A, Feintuch A, Meade T, Goldfarb D. Zero field splitting fluctuations induced phase relaxation of Gd3+ in frozen solutions at cryogenic temperatures. J Magn Reson 2014; 248:71-80. [PMID: 25442776 PMCID: PMC4495766 DOI: 10.1016/j.jmr.2014.09.012] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2014] [Revised: 09/14/2014] [Accepted: 09/16/2014] [Indexed: 05/18/2023]
Abstract
Distance measurements using double electron-electron resonance (DEER) and Gd(3+) chelates for spin labels (GdSL) have been shown to be an attractive alternative to nitroxide spin labels at W-band (95GHz). The maximal distance that can be accessed by DEER measurements and the sensitivity of such measurements strongly depends on the phase relaxation of Gd(3+) chelates in frozen, glassy solutions. In this work, we explore the phase relaxation of Gd(3+)-DOTA as a representative of GdSL in temperature and concentration ranges typically used for W-band DEER measurements. We observed that in addition to the usual mechanisms of phase relaxation known for nitroxide based spin labels, GdSL are subjected to an additional phase relaxation mechanism that features an increase in the relaxation rate from the center to the periphery of the EPR spectrum. Since the EPR spectrum of GdSL is the sum of subspectra of the individual EPR transitions, we attribute this field dependence to transition dependent phase relaxation. Using simulations of the EPR spectra and its decomposition into the individual transition subspectra, we isolated the phase relaxation of each transition and found that its rate increases with |ms|. We suggest that this mechanism is due to transient zero field splitting (tZFS), where its magnitude and correlation time are scaled down and distributed as compared with similar situations in liquids. This tZFS induced phase relaxation mechanism becomes dominant (or at least significant) when all other well-known phase relaxation mechanisms, such as spectral diffusion caused by nuclear spin diffusion, instantaneous and electron spin spectral diffusion, are significantly suppressed by matrix deuteration and low concentration, and when the temperature is sufficiently low to disable spin lattice interaction as a source of phase relaxation.
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Affiliation(s)
| | - A Dalaloyan
- Weizmann Institute of Science, Rehovot, Israel
| | - A Collauto
- Weizmann Institute of Science, Rehovot, Israel
| | - A Feintuch
- Weizmann Institute of Science, Rehovot, Israel
| | - T Meade
- Northwestern University, Evanston, IL 60208, USA
| | - D Goldfarb
- Weizmann Institute of Science, Rehovot, Israel.
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14
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Urcuyo D, Nassar A, Liu Q, Baldwin W, Poggio E, Fairchild R, Miller C, Goldfarb D, Quintini C. Acellular Perfusion of Porcine Kidneys: Lessons Learned. Transplantation 2014. [DOI: 10.1097/00007890-201407151-01195] [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: 11/25/2022]
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15
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Heaphy ELG, Poggio ED, Flechner SM, Goldfarb DA, Askar M, Fatica R, Srinivas TR, Schold JD. Risk factors for retransplant kidney recipients: relisting and outcomes from patients' primary transplant. Am J Transplant 2014; 14:1356-67. [PMID: 24731101 DOI: 10.1111/ajt.12690] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Revised: 01/14/2014] [Accepted: 02/02/2014] [Indexed: 01/25/2023]
Abstract
As of November 2013, 14.5% of the waitlist for a donor kidney comprised patients awaiting a retransplant. We performed a retrospective cohort study of 11,698 adult solitary kidney recipients using national Scientific Registry of Transplant Recipients data transplanted between 2002 and 2011. The aim was to investigate whether outcomes from patients' initial transplants are significant risk factors for patients' repeat transplants or for likelihood of relisting after a failed primary transplant. Retransplant recipients were more likely to be treated for acute rejection [adjusted odds ratio (AOR), 95% confidence interval (CI) = 1.26 (1.07-1.48), p = 0.0053] or hospitalized (AOR = 1.19, 95% CI 1.08-1.31, p = 0.0005) within a year of retransplantation if these outcomes were experienced within a year of primary transplant. Delayed graft function following primary transplants was associated with 35% increased likelihood of recurrence (AOR = 1.35, 95% CI = 1.18-1.54, p < 0.0001). An increase in 1-year GFR after primary transplant was associated with GFR 1 year postretransplant (β = 6.82, p < 0.0001), and retransplant graft failure was inversely associated with 1-year primary transplant GFR (adjusted hazard ratio = 0.74, 95% CI = 0.71-0.76 per 10 mL/min/1.73 m(2) ). A decreased likelihood for relisting was associated with hospitalization and higher GFR following primary transplantation. The increasing numbers of individuals requiring retransplants highlights the importance of incorporating prior transplant outcomes data to better inform relisting decisions and prognosticating retransplant outcomes.
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Affiliation(s)
- E L G Heaphy
- Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, OH
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16
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Hovav Y, Feintuch A, Vega S, Goldfarb D. Dynamic nuclear polarization using frequency modulation at 3.34 T. J Magn Reson 2014; 238:94-105. [PMID: 24333831 DOI: 10.1016/j.jmr.2013.10.025] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Revised: 10/09/2013] [Accepted: 10/29/2013] [Indexed: 06/03/2023]
Abstract
During dynamic nuclear polarization (DNP) experiments polarization is transferred from unpaired electrons to their neighboring nuclear spins, resulting in dramatic enhancement of the NMR signals. While in most cases this is achieved by continuous wave (cw) irradiation applied to samples in fixed external magnetic fields, here we show that DNP enhancement of static samples can improve by modulating the microwave (MW) frequency at a constant field of 3.34 T. The efficiency of triangular shaped modulation is explored by monitoring the (1)H signal enhancement in frozen solutions containing different TEMPOL radical concentrations at different temperatures. The optimal modulation parameters are examined experimentally and under the most favorable conditions a threefold enhancement is obtained with respect to constant frequency DNP in samples with low radical concentrations. The results are interpreted using numerical simulations on small spin systems. In particular, it is shown experimentally and explained theoretically that: (i) The optimal modulation frequency is higher than the electron spin-lattice relaxation rate. (ii) The optimal modulation amplitude must be smaller than the nuclear Larmor frequency and the EPR line-width, as expected. (iii) The MW frequencies corresponding to the enhancement maxima and minima are shifted away from one another when using frequency modulation, relative to the constant frequency experiments.
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Affiliation(s)
- Y Hovav
- Weizmann Institute of Science, Rehovot, Israel
| | - A Feintuch
- Weizmann Institute of Science, Rehovot, Israel
| | - S Vega
- Weizmann Institute of Science, Rehovot, Israel.
| | - D Goldfarb
- Weizmann Institute of Science, Rehovot, Israel.
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17
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Vigier FM, Shimon D, Mugnaini V, Veciana J, Feintuch A, Pons M, Vega S, Goldfarb D. The 13C solid DNP mechanisms with perchlorotriphenylmethyl radicals – the role of 35,37Cl. Phys Chem Chem Phys 2014; 16:19218-28. [DOI: 10.1039/c4cp02275k] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Chlorinated trityl radicals generate 13C DNP frequency sweeps that indicate contributions of e → 36,37Cl → 13C polarization transfer mechanism at low temperatures and that the relative contributions of the solid effect and cross effects mechanism can be controlled by the microwave irradiation power.
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Affiliation(s)
- F. Mentink Vigier
- Chemical Physics Department Weizmann Institute of Science
- 76100 Rehovot, Israel
| | - D. Shimon
- Chemical Physics Department Weizmann Institute of Science
- 76100 Rehovot, Israel
| | - V. Mugnaini
- Institut de Ciencia de Materials de Barcelona (ICMAB-CSIC)
- Bellaterra, Spain
- Networking Research Center on Bioengineering
- Biomaterials
- and NanoMedicine (CIBER-BBN)
| | - J. Veciana
- Institut de Ciencia de Materials de Barcelona (ICMAB-CSIC)
- Bellaterra, Spain
- Networking Research Center on Bioengineering
- Biomaterials
- and NanoMedicine (CIBER-BBN)
| | - A. Feintuch
- Chemical Physics Department Weizmann Institute of Science
- 76100 Rehovot, Israel
| | - M. Pons
- Biomolecular NMR laboratory
- Department of Organic Chemistry
- University of Barcelona
- 10-12 08028 Barcelona, Spain
| | - S. Vega
- Chemical Physics Department Weizmann Institute of Science
- 76100 Rehovot, Israel
| | - D. Goldfarb
- Chemical Physics Department Weizmann Institute of Science
- 76100 Rehovot, Israel
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18
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19
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Mentink-Vigier F, Collauto A, Feintuch A, Kaminker I, Tarle V, Goldfarb D. Increasing sensitivity of pulse EPR experiments using echo train detection schemes. J Magn Reson 2013; 236:117-125. [PMID: 24121563 DOI: 10.1016/j.jmr.2013.08.012] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2013] [Revised: 08/25/2013] [Accepted: 08/26/2013] [Indexed: 06/02/2023]
Abstract
Modern pulse EPR experiments are routinely used to study the structural features of paramagnetic centers. They are usually performed at low temperatures, where relaxation times are long and polarization is high, to achieve a sufficient Signal/Noise Ratio (SNR). However, when working with samples whose amount and/or concentration are limited, sensitivity becomes an issue and therefore measurements may require a significant accumulation time, up to 12h or more. As the detection scheme of practically all pulse EPR sequences is based on the integration of a spin echo--either primary, stimulated or refocused--a considerable increase in SNR can be obtained by replacing the single echo detection scheme by a train of echoes. All these echoes, generated by Carr-Purcell type sequences, are integrated and summed together to improve the SNR. This scheme is commonly used in NMR and here we demonstrate its applicability to a number of frequently used pulse EPR experiments: Echo-Detected EPR, Davies and Mims ENDOR (Electron-Nuclear Double Resonance), DEER (Electron-Electron Double Resonance|) and EDNMR (Electron-Electron Double Resonance (ELDOR)-Detected NMR), which were combined with a Carr-Purcell-Meiboom-Gill (CPMG) type detection scheme at W-band. By collecting the transient signal and integrating a number of refocused echoes, this detection scheme yielded a 1.6-5 folds SNR improvement, depending on the paramagnetic center and the pulse sequence applied. This improvement is achieved while keeping the experimental time constant and it does not introduce signal distortion.
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Affiliation(s)
- F Mentink-Vigier
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot 76100, Israel
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20
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Schold JD, Heaphy ELG, Buccini LD, Poggio ED, Srinivas TR, Goldfarb DA, Flechner SM, Rodrigue JR, Thornton JD, Sehgal AR. Prominent impact of community risk factors on kidney transplant candidate processes and outcomes. Am J Transplant 2013; 13:2374-83. [PMID: 24034708 PMCID: PMC3775281 DOI: 10.1111/ajt.12349] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2013] [Revised: 04/20/2013] [Accepted: 05/21/2013] [Indexed: 01/25/2023]
Abstract
Numerous factors impact patients' health beyond traditional clinical characteristics. We evaluated the association of risk factors in kidney transplant patients' communities with outcomes prior to transplantation. The primary exposure variable was a community risk score (range 0-40) derived from multiple databases and defined by factors including prevalence of comorbidities, access and quality of healthcare, self-reported physical and mental health and socioeconomic status for each U.S. county. We merged data with the Scientific Registry of Transplant Recipients (SRTR) and utilized risk-adjusted models to evaluate effects of community risk for adult candidates listed 2004-2010 (n = 209 198). Patients in highest risk communities were associated with increased mortality (adjusted hazard ratio [AHR] = 1.22, 1.16-1.28), decreased likelihood of living donor transplantation (adjusted odds ratio [AOR] = 0.90, 0.85-0.94), increased waitlist removal for health deterioration (AHR = 1.36, 1.22-1.51), decreased likelihood of preemptive listing (AOR = 0.85, 0.81-0.88), increased likelihood of inactive listing (AOR = 1.49, 1.43-1.55) and increased likelihood of listing for expanded criteria donor kidneys (AHR = 1.19, 1.15-1.24). Associations persisted with adjustment for rural-urban location; furthermore the independent effects of rural-urban location were largely eliminated with adjustment for community risk. Average community risk varied widely by region and transplant center (median = 21, range 5-37). Community risks are powerful factors associated with processes of care and outcomes for transplant candidates and may be important considerations for developing effective interventions and measuring quality of care of transplant centers.
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Affiliation(s)
- JD Schold
- Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, Ohio,Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio,Center for Health Disparities, MetroHealth Medical Center and Case Western Reserve University, Cleveland, Ohio
| | - ELG Heaphy
- Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, Ohio
| | - LD Buccini
- Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, Ohio,Digestive Disease Institute, Cleveland Clinic, Cleveland, Ohio
| | - ED Poggio
- Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio,Glickman Urological and Kidney Institute, Cleveland, Ohio
| | - TR Srinivas
- Department of Nephrology, Medical University of South Carolina, Charleston, South Carolina
| | - DA Goldfarb
- Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio,Glickman Urological and Kidney Institute, Cleveland, Ohio
| | - SM Flechner
- Glickman Urological and Kidney Institute, Cleveland, Ohio
| | - JR Rodrigue
- Transplant Institute, Beth Israel Deaconess Medical Center, Harvard University, Boston, Massachusetts
| | - JD Thornton
- Center for Health Disparities, MetroHealth Medical Center and Case Western Reserve University, Cleveland, Ohio
| | - AR Sehgal
- Center for Health Disparities, MetroHealth Medical Center and Case Western Reserve University, Cleveland, Ohio
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Schold JD, Buccini LD, Heaphy E, Goldfarb DA, Sehgal AR, Fung J, Poggio ED, Kattan MW. The prognostic value of kidney transplant center report cards. Am J Transplant 2013; 13:1703-12. [PMID: 23710661 PMCID: PMC3696034 DOI: 10.1111/ajt.12294] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2012] [Accepted: 02/25/2013] [Indexed: 01/25/2023]
Abstract
SRTR report cards provide the basis for quality measurement of US transplant centers. There is limited data evaluating the prognostic value of report cards, informing whether they are predictive of prospective patient outcomes. Using national SRTR data, we simulated report cards and calculated standardized mortality ratios (SMR) for kidney transplant centers over five distinct eras. We ranked centers based on SMR and evaluated outcomes for patients transplanted the year following reports. Recipients transplanted at the 50th, 100th and 200th ranked centers had 18% (AHR = 1.18, 1.13-1.22), 38% (AHR = 1.38, 1.28-1.49) and 91% (AHR = 1.91, 1.64-2.21) increased hazard for 1-year mortality relative to recipients at the top-ranked center. Risks were attenuated but remained significant for long-term outcomes. Patients transplanted at centers meeting low-performance criteria in the prior period had 40% (AHR = 1.40, 1.22-1.68) elevated hazard for 1-year mortality in the prospective period. Centers' SMR from the report card was highly predictive (c-statistics > 0.77) for prospective center SMRs and there was significant correlation between centers' SMR from the report card period and the year following (ρ = 0.57, p < 0.001). Although results do not mitigate potential biases of report cards for measuring quality, they do indicate strong prognostic value for future outcomes. Findings also highlight that outcomes are associated with center ranking across a continuum rather than solely at performance margins.
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Affiliation(s)
- JD Schold
- Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, Ohio,Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio
| | - LD Buccini
- Digestive Disease Institute, Cleveland Clinic, Cleveland, Ohio
| | - E Heaphy
- Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, Ohio
| | - DA Goldfarb
- Glickman Urological and Kidney Institute, Cleveland Clinic, Cleveland, Ohio
| | - AR Sehgal
- Center for Reducing Health Disparities, MetroHealth Hospital and Case Western Reserve University Cleveland, Ohio
| | - J Fung
- Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio,Digestive Disease Institute, Cleveland Clinic, Cleveland, Ohio
| | - ED Poggio
- Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio,Glickman Urological and Kidney Institute, Cleveland Clinic, Cleveland, Ohio
| | - MW Kattan
- Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, Ohio,Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio
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22
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Raitsimring A, Astashkin AV, Enemark J, Kaminker I, Goldfarb D, Walter ED, Song Y, Meade TJ. Optimization of pulsed DEER measurements for Gd-based labels: choice of operational frequencies, pulse durations and positions, and temperature. Appl Magn Reson 2013; 44:649-670. [PMID: 23687407 PMCID: PMC3654798 DOI: 10.1007/s00723-012-0434-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
In this work, the experimental conditions and parameters necessary to optimize the long-distance (≥ 60 Å) Double Electron-Electron Resonance (DEER) measurements of biomacromolecules labeled with Gd(III) tags are analyzed. The specific parameters discussed are the temperature, microwave band, the separation between the pumping and observation frequencies, pulse train repetition rate, pulse durations and pulse positioning in the electron paramagnetic resonance spectrum. It was found that: (i) in optimized DEER measurements, the observation pulses have to be applied at the maximum of the EPR spectrum; (ii) the optimal temperature range for Ka-band measurements is 14-17 K, while in W-band the optimal temperatures are between 6-9 K; (iii) W-band is preferable to Ka-band for DEER measurements. Recent achievements and the conditions necessary for short-distance measurements (<15 Å) are also briefly discussed.
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Affiliation(s)
- A. Raitsimring
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721-0041, USA
| | - A. V. Astashkin
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721-0041, USA
| | - J.H. Enemark
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721-0041, USA
| | - I. Kaminker
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - D. Goldfarb
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - E. D. Walter
- Pacific Northwest National Laboratory, EMSL, 3335 Q Ave, Richland, WA 99354, USA
| | - Y. Song
- Department of Chemistry; Department of Biochemistry, Cell Biology, and Molecular Biology; Neurobiology & Physiology; Department of Radiology, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA
| | - T. J. Meade
- Department of Chemistry; Department of Biochemistry, Cell Biology, and Molecular Biology; Neurobiology & Physiology; Department of Radiology, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA
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23
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Heaphy ELG, Goldfarb DA, Poggio ED, Buccini LD, Flechner SM, Schold JD. The impact of deceased donor kidney risk significantly varies by recipient characteristics. Am J Transplant 2013; 13:1001-1011. [PMID: 23406350 DOI: 10.1111/ajt.12154] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2012] [Revised: 12/10/2012] [Accepted: 12/26/2012] [Indexed: 01/25/2023]
Abstract
As of May 2012, over 92 000 patients were awaiting a solitary kidney transplant in the United States and new waitlist registrations have been rising for over a decade. The decreasing availability of donor organs makes it imperative that organ allocation be as efficient and effective as possible. We performed a retrospective cohort study of adult recipients in the United States (n=109 392) using Scientific Registry of Transplant Recipients data. The primary aim was to evaluate the interaction of donor risk with recipient characteristics on posttransplant outcomes. Donor quality (based on kidney donor risk index [KDRI]) had significant interactions by race, primary diagnosis and age. The hazard of KDRI on overall graft loss in non-African Americans was 2.16 (95%CI 2.08-2.25) versus 1.85 (95%CI 1.75-1.95) in African Americans (p<0.0001), 2.16 (95%CI 2.08-2.24) in nondiabetics versus 1.84 (95%CI 1.74-1.94) in diabetics (p<0.0001), and 2.22 (95%CI 2.13-2.32) in recipients<60 years versus 1.83 (95%CI 1.74-1.92) in recipients≥60 (p<0.0001). The relative hazard for diabetics at KDRI=0.5 was 1.49 but at KDRI=2.0 the hazard was significantly attenuated to 1.17; among African Americans the respective risks were 1.50 and 1.17 and among recipients 60 and over, it was between 1.64 and 1.22. These findings are critical considerations for informed decision-making for transplant candidates.
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Affiliation(s)
- E L G Heaphy
- Department of Quantitative Health Sciences, Cleveland, Clinic, Cleveland, OH
| | - D A Goldfarb
- Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH.,Glickman Urological and Kidney Institute, Cleveland Clinic, Cleveland, OH
| | - E D Poggio
- Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH.,Glickman Urological and Kidney Institute, Cleveland Clinic, Cleveland, OH
| | - L D Buccini
- Department of Quantitative Health Sciences, Cleveland, Clinic, Cleveland, OH.,Digestive Disease Institute, Cleveland Clinic, Cleveland, OH
| | - S M Flechner
- Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH.,Glickman Urological and Kidney Institute, Cleveland Clinic, Cleveland, OH
| | - J D Schold
- Department of Quantitative Health Sciences, Cleveland, Clinic, Cleveland, OH.,Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH
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24
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Schold JD, Buccini LD, Srinivas TR, Srinivas RT, Poggio ED, Flechner SM, Soria C, Segev DL, Fung J, Goldfarb DA. The association of center performance evaluations and kidney transplant volume in the United States. Am J Transplant 2013; 13:67-75. [PMID: 23279681 DOI: 10.1111/j.1600-6143.2012.04345.x] [Citation(s) in RCA: 102] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2012] [Revised: 05/25/2012] [Accepted: 05/29/2012] [Indexed: 01/25/2023]
Abstract
Report cards evaluating transplant center performance have received significant attention in recent years corresponding with the Centers for Medicare and Medicaid Services issue of the 2007 Conditions of Participation. Our primary aim was to evaluate the association of report card evaluations with transplant center volume. We utilized data from the Scientific Registry of Transplant Recipients (SRTR) along with six consecutive program-specific reports from January 2007 to July 2009 for adult kidney transplant centers. Among 203 centers, 46 (23%) were low performing (LP) with statistically significantly lower than expected 1-year graft or patient survival at least once during the study period. Among LP centers, there was a mean decline in transplant volume of 22.4 cases compared to a mean increase of 7.8 transplants among other centers (p = 0.001). Changes in volume between LP and other centers were significant for living, standard and expanded criteria deceased donor (ECD) transplants. LPs had a reduction in use of donors with extended cold ischemia time (p = 0.04) and private pay recipients (p = 0.03). Centers without low performance evaluations were more likely to increase the proportion of overall transplants that were ECDs relative to other centers (p = 0.04). Findings indicate a significant association between reduced kidney transplant volume and low performance report card evaluations.
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Affiliation(s)
- J D Schold
- Department of Quantitative Health Sciences, Cleveland Clinic, OH, USA.
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25
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Schold J, Poggio E, Flechner S, Goldfarb D, Askar M, Buccini L, Srinivas T. Graft Survival from Kidney Recipients Primary Transplant: a Powerful Predictor for Re-Transplant Survival. Transplantation 2012. [DOI: 10.1097/00007890-201211271-00608] [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: 11/25/2022]
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26
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Bearden D, Brizzi K, Dlugos D, Goldfarb D, Kolson D, Lowenthal E, Steenhoff A, Kessler S. Epilepsy in Children with HIV/AIDS in Botswana: Prevalence, Risk Factors, and Outcomes (P01.260). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.p01.260] [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: 11/15/2022] Open
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27
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28
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Kaouk JH, Spana G, Hillyer SP, White MA, Haber GP, Goldfarb D. Robotic-assisted laparoscopic partial nephrectomy for a 7-cm mass in a renal allograft. Am J Transplant 2011; 11:2242-6. [PMID: 21827624 DOI: 10.1111/j.1600-6143.2011.03655.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Treatment options for a suspicious renal mass in a renal allograft include radical nephrectomy or nephron-sparing surgery (NSS). To our knowledge robotic-assisted laparoscopic partial nephrectomy (RPN) as treatment for a renal mass in a transplant kidney has not been previously reported. We report the case of RPN for a 7-cm renal mass in a transplanted kidney. A 35-year-old female with reflux nephropathy received a living-related donor kidney transplant in 1986. At 24 years after transplantation she had a 7-cm Bosniak III cystic mass of the allograft detected on computerized tomography (CT) scan. Preoperative creatinine was 2.2 mg/dL with an estimated glomerular filtration rate (eGFR) of 25 mL/min/1.73 m(2) . RPN was performed with bulldog clamping of the renal vessels, the graft was left in situ and immunosuppression was maintained postoperatively. Tumor diameter was 7.3 cm with a nephrometry score of 10a. Warm ischemia time (WIT) was 26.5 min. Estimated blood loss was 100 mL. There was no change between pre- and postoperative eGFR. There were no operative complications. Histology was papillary renal cell carcinoma type 1, nuclear grade 2. Margins were negative. RPN is a technically feasible treatment option for a suspicious renal mass in renal allografts.
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Affiliation(s)
- J H Kaouk
- Glickman Urological Institute Cleveland Clinic, Cleveland, OH, USA.
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29
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Krishnamurthi V, Subramanian V, Berglund R, Navia J, Nowicki E, Miocinovic R, Stephenson A, Goldfarb D, Klein E, Novick A. MP-06.11 Contemporary Vascular Bypass Approach for Treatment of Retroperitoneal Tumors with Inferior Vena Cava and Atrial Extension: A 20-Year Single Institution Experience. Urology 2011. [DOI: 10.1016/j.urology.2011.07.135] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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30
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Potapov A, Song Y, Meade TJ, Goldfarb D, Astashkin A, Raitsimring A. Distance measurements in model bis-Gd(III) complexes with flexible "bridge". Emulation of biological molecules having flexible structure with Gd(III) labels attached. J Magn Reson 2010; 205:38-49. [PMID: 20418132 PMCID: PMC2885582 DOI: 10.1016/j.jmr.2010.03.019] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2009] [Revised: 03/30/2010] [Accepted: 03/30/2010] [Indexed: 05/18/2023]
Abstract
In this work, we continue to explore Gd(III) as a possible spin label for high-field Double Electron-Electron Resonance (DEER) based distance measurements in biological molecules with flexible geometry. For this purpose, a bis-Gd(III) complex with a flexible "bridge" was used as a model. The distances in the model were expected to be distributed in the range of 5-26 A, allowing us to probe the shortest limits of accessible distances which were found to be as small as 13 A. The upper distance limit for these labels was also evaluated and was found to be about 60 A. Various pulse duration setups can result in apparent differences in the distribution function derived from DEER kinetics due to short distance limit variations. The advantages, such as the ability to perform measurements at cryogenic temperatures and high repetition rates simultaneously, the use of very short pumping and observation pulses without mutual interference, the lack of orientational selectivity, as well as the shortcomings, such as the limited mw operational frequency range and intrinsically smaller amplitude of oscillation related to dipolar interaction as compared with nitroxide spin labels are discussed. Most probably the use of nitroxide and Gd-based labels for distance measurements will be complementary depending on the particulars of the problem and the availability of instrumentation.
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Affiliation(s)
- A. Potapov
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Y. Song
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - T. J. Meade
- Department of Chemistry; Department of Biochemistry, Cell Biology, and Molecular Biology; Neurobiology & Physiology; Department of Radiology, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA
| | - D. Goldfarb
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - A.V. Astashkin
- Department of Chemistry, University of Arizona, Tucson, Arizona 85721-0041, USA
| | - A. Raitsimring
- Department of Chemistry, University of Arizona, Tucson, Arizona 85721-0041, USA
- Corresponding author: Dr. A. Raitsimring, University of Arizona, Department of Chemistry, 1306 E. University Blvd, Tucson, AZ 85721. ; tel (520)621-9968; fax (520)621-8407
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31
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Woodle ES, Daller JA, Aeder M, Shapiro R, Sandholm T, Casingal V, Goldfarb D, Lewis RM, Goebel J, Siegler M. Ethical considerations for participation of nondirected living donors in kidney exchange programs. Am J Transplant 2010; 10:1460-7. [PMID: 20553449 DOI: 10.1111/j.1600-6143.2010.03136.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Kidneys from nondirected donors (NDDs) have historically been allocated directly to the deceased donor wait list (DDWL). Recently, however, NDDs have participated in kidney exchange (KE) procedures, including KE 'chains', which have received considerable media attention. This increasing application of KE chains with NDD participation has occurred with limited ethical analysis and without ethical guidelines. This article aims to provide a rigorous ethical evaluation of NDDs and chain KEs. NDDs and bridge donors (BDs) (i.e. living donors who link KE procedures within KE chains) raise several ethical concerns including coercion, privacy, confidentiality, exploitation and commercialization. In addition, although NDD participation in KE procedures may increase transplant numbers, it may also reduce NDD kidney allocation to the DDWL, and disadvantage vulnerable populations, particularly O blood group candidates. Open KE chains (also termed 'never-ending' chains) result in a permanent diversion of NDD kidneys from the DDWL. The concept of limited KE chains is discussed as an ethically preferable means for protecting NDDs and BDs from coercion and minimizing 'backing out', whereas 'honor systems' are rejected because they are coercive and override autonomy. Recent occurrences of BDs backing out argue for adoption of ethically based protective measures for NDD participation in KE.
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Affiliation(s)
- E S Woodle
- The Paired Donation Network, Orlando, FL, USA.
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32
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Abstract
We performed renal function studies in dogs with chronic renovascular hypertension produced by complete occlusion of a renal artery. In addition, we evaluated in anesthetized dogs the acute effects of a novel angiotensin converting enzyme inhibitor, CGS 16,617, on renal function and plasma neurohormones (epinephrine, norepinephrine and vasopressin) 4 weeks after initiation of 2 kidney, 1 clip hypertension. CGS 16,617 effectively decreased blood pressure in renal hypertensive animals. This response was associated with suppression of angiotensin II indicating effective converting enzyme inhibition. In the non-clipped kidney, acute administration of CGS 16,617 increased effective renal plasma flow but not glomerular filtration rate and urinary sodium excretion. In the clipped kidney, CGS 16,617 caused no change in any parameter of renal function. Plasma norepinephrine, epinephrine and vasopressin were unaffected by administration of CGS 16,617. These studies showed that chronic occlusion of a renal artery does not result in renal infarction because of a compensatory increase in the amount of blood provided through capsular collateral vessels. The collateral circulation which has developed in the clipped kidney explains the lack of a converting enzyme inhibitor effect.
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Affiliation(s)
- Y Tsuji
- Department of Brain and Vascular Research, Cleveland Clinic Foundation, Ohio 44195
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33
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Goldfarb D, Harvey S, Jessamine K, Jessamine P, Toye B, Desjardins M. P70 Detection of plasmid mediated KPC-producing Klebsiella pneumo-niae in Ottawa, Canada: evidence of intra-hospital transmission. Int J Antimicrob Agents 2009. [DOI: 10.1016/s0924-8579(09)70289-4] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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34
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Stoll S, Epel B, Vega S, Goldfarb D. Ligand protons in a frozen solution of copper histidine relax via a T1e -driven three-spin mechanism. J Chem Phys 2008; 127:164511. [PMID: 17979364 DOI: 10.1063/1.2794329] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Davies electron-nuclear double resonance spectra can exhibit strong asymmetries for long mixing times, short repetition times, and large thermal polarizations. These asymmetries can be used to determine nuclear relaxation rates in paramagnetic systems. Measurements of frozen solutions of copper(L-histidine)(2) reveal a strong field dependence of the relaxation rates of the protons in the histidine ligand, increasing from low (g( parallel)) to high (g( perpendicular)) field. It is shown that this can be attributed to a concentration-dependent T(1e)-driven relaxation process involving strongly mixed states of three spins: the histidine proton, the Cu(II) electron spin of the same complex, and another distant electron spin with a resonance frequency differing from the spectrometer frequency approximately by the proton Larmor frequency. The protons relax more efficiently in the g( perpendicular) region, since the number of distant electrons able to participate in this relaxation mechanism is higher than in the g( parallel) region. Analytical expressions for the associated nuclear polarization decay rate Tau(een) (-1) are developed and Monte Carlo simulations are carried out, reproducing both the field and the concentration dependences of the nuclear relaxation.
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Affiliation(s)
- S Stoll
- Physical Chemistry Laboratory, ETH Zurich, 8093 Zurich, Switzerland.
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35
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Karakis I, Blumenfeld M, Carel R, Yagev Y, Goldfarb D. Usefulness of Linking Clinical Data Bases (DBs) for Epidemiological Research. Epidemiology 2006. [DOI: 10.1097/00001648-200611001-00737] [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: 11/25/2022]
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36
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Goldfarb D, Dong R, Luz Z, Zimmermann H. Deuterium N.M.R. relaxation and spectral densities in the discotic mesophase of hexahexyloxytriphenylene. Mol Phys 2006. [DOI: 10.1080/00268978500100941] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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37
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Poggio ED, Hila S, Stephany B, Fatica R, Krishnamurthi V, del Bosque C, Goldfarb D, Herts B, Dennis VW, Heeger PS, Braun W. Donor kidney volume and outcomes following live donor kidney transplantation. Am J Transplant 2006; 6:616-24. [PMID: 16468974 DOI: 10.1111/j.1600-6143.2005.01225.x] [Citation(s) in RCA: 121] [Impact Index Per Article: 6.7] [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: 01/25/2023]
Abstract
Pre-donation kidney volume and function may be crucial factors in determining graft outcomes in kidney transplant recipients. We measured living donor kidney volumes by 3D helical computed tomography scanning and glomerular filtration rate (GFR) by (125)I-iothalamate clearances in 119 donors, and correlated these values with graft function and incidence of acute rejection at 2 years post-transplantation. Kidney volume strongly correlated with GFR (Pearson r= 0.71, p < 0.001). Body size and male gender were independent correlates of larger kidney volumes, and body size and age were predictors of kidney function. The effects of transplanted kidney volume on graft outcome were studied in 104 donor-recipient pairs. A transplanted kidney volume greater than 120 cc/1.73 m(2) was independently associated with better estimated GFR at 2 years post-transplant when compared to recipients of lower transplanted kidney volumes (64 +/- 19 vs. 48 +/- 14 mL/min/1.73 m(2), p < 0.001). Moreover, recipients of lower volumes had a higher incidence of acute cellular rejection (16% vs. 3.7%, p = 0.046). In conclusion, kidney volume strongly correlates with function in living kidney donors and is an independent determinant of post-transplant graft outcome. The findings suggest that (1) transplantation of larger kidneys confers an outcome advantage and (2) larger kidneys should be preferred when selecting from otherwise similar living donors.
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Affiliation(s)
- E D Poggio
- Department of Nephrology and Hypertension, Cleveland Clinic Foundation, Cleveland, Ohio, USA.
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Gov N, Borukhov I, Goldfarb D. Morphological transitions during the formation of templated mesoporous materials: theoretical modeling. Langmuir 2006; 22:605-14. [PMID: 16401108 DOI: 10.1021/la052272r] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
We put forward a theoretical model for the morphological transitions of templated mesoporous materials. These materials consist of a mixture of surfactant molecules and inorganic compounds which evolve dynamically upon mixing to form different morphologies depending on the composition and conditions at which mixing occurs. Our theoretical analysis is based on the assumption that adsorption of the inorganic compounds onto mesoscopic assemblies of surfactant molecules changes the effective interactions between the surfactant molecules, consequently lowering the spontaneous curvature of the surfactant layer and inducing morphological changes in the system. On the basis of a mean field phase diagram, we are able to follow the trajectories of the system starting with different initial conditions, and predict the final morphology of the product. In a typical scenario, the reduction in the spontaneous curvature leads first to a smooth transition from compact spherical micelles to elongated worm-like micelles. In the second stage, the layer of inorganic material coating the micelles gives rise to attractive inter-micellar interactions that eventually induce a collapse of the system into a closely packed hexagonal array of coated cylinders. Other pathways may lead to different structures including disordered bicontinuous and ordered cubic phases. The model is in good qualitative agreement with experimental observations.
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Affiliation(s)
- N Gov
- Department of Chemical Physics, The Weizmann Institute of Science, P.O. Box 26, Rehovot, Israel 76100.
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Flechner SM, Friend PJ, Brockmann J, Ismail HR, Zilvetti M, Goldfarb D, Modlin C, Mastroianni B, Savas K, Devaney A, Simmonds M, Cook DJ. Alemtuzumab induction and sirolimus plus mycophenolate mofetil maintenance for CNI and steroid-free kidney transplant immunosuppression. Am J Transplant 2005; 5:3009-14. [PMID: 16303017 DOI: 10.1111/j.1600-6143.2005.01123.x] [Citation(s) in RCA: 86] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
We performed a pilot study in which 22 kidney recipients (14 LD: 8 DCD) were given alemtuzumab induction (30 mg day 0 and 1), steroids (500 mg mp day 0 and 1, none thereafter), mycophenolate mofetil (MMF) maintenance (500 mg b.i.d) and sirolimus (concentration controlled 8-12 ng/mL). With a mean follow-up of 15.9 months, patient survival is (21/22) 96% and graft survival (19/22) 87%. Acute rejections occurred in (8) 36.3% (two humoral). Of 19 surviving grafts, 18 (95%) remain steroid and 15 (79%) CNI-free. At 1 year, mean creatinine was 1.43 mg/dL. Overall infection rates were low, but 2 patients developed severe acute respiratory distress syndrome (ARDS) at month 3 and 7, respectively, resulting in mortality in one and a graft loss in the other. No cancer or PTLD was observed. Leukopenia was common and MMF dose was reduced or eliminated in 6/22 (27%) patients. The reported higher than expected rate of acute rejection, leukopenia and possible pulmonary toxicity suggests excessive morbidity. Modifications such as an initial period of CNI use should be considered.
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Affiliation(s)
- S M Flechner
- Transplant Center, Cleveland Clinic Foundation, Cleveland, Ohio, USA.
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Abstract
▪ Abstract Two current frontiers in EPR research are high-field ([Formula: see text]) electron paramagnetic resonance (EPR) and high-field electron-nuclear double resonance (ENDOR). This review focuses on recent advances in high-field ENDOR and its applications to the study of proteins containing native paramagnetic sites. It concentrates on two aspects; the first concerns the determination of the location of protons and is related to the site geometry, and the second focuses on the spin density distribution within the site, which is inherent to the electronic structure. Both spin density and proton locations can be derived from ligand hyperfine couplings determined by ENDOR measurements. A brief description of the experimental methods is presented along with a discussion of the advantages and disadvantages of high-field ENDOR compared with conventional X-band (∼ 9.5 GHz) experiments. Specific examples of both protein single crystals and frozen solutions are then presented. These include the determination of the coordinates of water ligand protons in the Mn(II) site of concanavalin A, the detection of hydrogen bonds in a quinone radical in the bacterial photosynthetic reaction center as well as in the tyrosyl radical in ribonuclease reductase, and the study of the spin distribution in copper proteins. The copper proteins discussed are the type I copper of azurin and the binuclear CuA center in a number of proteins. The last part of the review presents a brief discussion of the interpretation of hyperfine couplings using quantum chemical calculations, primarily density functional theory (DFT) methods. Such methods are becoming an integral part of the data analysis tools, as they can facilitate signal assignment and provide the ultimate relation between the experimental hyperfine couplings and the electronic wave function.
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Affiliation(s)
- D Goldfarb
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot, Israel 76100.
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Goldfarb D, Epel B, Zimmermann H, Jeschke G. 2D TRIPLE in orientationally disordered samples--a means to resolve and determine relative orientation of hyperfine tensors. J Magn Reson 2004; 168:75-87. [PMID: 15082251 DOI: 10.1016/j.jmr.2004.01.019] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2003] [Revised: 01/26/2004] [Indexed: 05/24/2023]
Abstract
The two-dimensional (2D) TRIPLE experiment provides correlations between electron-nuclear double resonance (ENDOR) frequencies that belong to the same electron-spin manifold, M(S), and therefore allows to assign ENDOR lines to their specific paramagnetic centers and M(S) manifolds. This, in turn, also provides the relative signs of the hyperfine couplings. So far this experiment has been applied only to single crystals, where the cross-peaks in the 2D spectrum are well resolved with regular shapes. Here we introduce the application of the 2D TRIPLE experiment to orientationally disordered systems, where it can resolve overlapping powder patterns. Moreover, analysis of the shape of the cross-peaks shows that it is highly dependent on the relative orientation of the hyperfine tensors of the two nuclei contributing to this particular peak. This is done initially through a series of simulations and then demonstrated experimentally at a high field (W-band, 95 GHz). The first example concerned the (1)H hyperfine tensors of the stable radical alpha,gamma-bisdiphenylene-beta-phenylallyl (BDPA) immobilized in a polystyrene matrix. Then, the experiment was applied to a more complex system, a frozen solution of Cu(II)-bis(2,2':6',2'' terpyridine) complex. There, the 2D TRIPLE experiment was combined with the variable mixing time (VMT) ENDOR experiment, which determined the absolute sign of the hyperfine couplings involved, and orientation selective ENDOR experiments. Analysis of the three experiments gave the hyperfine tensors of a few coupled protons.
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Affiliation(s)
- D Goldfarb
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot 76100, Israel.
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Abstract
A new and easy method for preparing blue sodalite pigments which involves high-temperature calcination of sodalite samples synthesized with aluminum sulfate and an organic template, is presented. Calcination generated the S(3)(-) and S(2)(-) radicals, and the effects of the Al/Si ratio and the calcination temperature on the nature and amounts of the radicals were examined. The radicals were characterized in detail by continuous wave and pulsed EPR at X- and W-band frequencies (approximately 9 and 95 GHz, respectively) complemented by UV-vis measurements. The high-field electron-paramagnetic resonance (EPR) measurements allowed us to clearly resolve the g anisotropy of S(3)(-) and W-band electron nuclear double resonance (ENDOR) measurements detected strong coupling with extra-framework (23)Na cations and weak coupling with framework (27)Al. On the basis of the spectroscopic results and density functional theory (DFT) calculations of the g-tensors of S(3)(-) and S(2)(-) radicals, the EPR signals were attributed to three different radicals, all with the open structure C(2v), that are located within the sodalite beta cages. While two of these radicals are well isolated, the third one is associated with an exchange-narrowed signal originating from S(3)(-) radicals in nearby sodalite cages.
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Affiliation(s)
- D Arieli
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot, Israel, 76100
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Abstract
The nuclear pore complex catalyses the import and export of both proteins and RNAs. The molecular mechanisms of RNA and protein translocation through the nuclear pore are likely to be similar; however, their signals and targeting apparatus may differ. Recent insights into RNA transport have come from studies of kinetic control mechanisms and the preconditions for translocation that include processing, RNP assembly, and a targeting function for 5' caps.
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Affiliation(s)
- D Goldfarb
- Department of Biology, University of Rochester, Rochester, NY 14627, USA
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Arieli D, Prisner TF, Hertel M, Goldfarb D. Resolving Mn framework sites in large cage aluminophosphate zeotypes by high field EPR and ENDOR spectroscopy. Phys Chem Chem Phys 2004. [DOI: 10.1039/b310800g] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
Two approaches for improving the signal-to-noise ratio (S/N) of W-band pulsed electron-nuclear double resonance (ENDOR) spectra are presented. One eliminates base-line problems while the other enhances the ENDOR effect. High field ENDOR spectra measured at low temperatures often suffer from highly distorted base-lines due to the heating effect of the RF pulses that causes some detuning of the cavity and therefore leads to a reduction in the echo intensity. This is a severe problem because it often masks broad and weak ENDOR signals. We show that it can be eliminated by recording the ENDOR spectrum in a random, rather than the standard sequential variation of the RF frequency. The S/N of the ENDOR spectrum can be significantly enhanced by the application of the pulse analog of the continuous wave (CW) special TRIPLE experiment. While this experiment is not applicable in the solid state at conventional X-band frequencies, at W-band it is most efficient. We demonstrate the efficiency of the special TRIPLE Davies and Mims experiments on single crystals and orientationally disordered systems.
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Affiliation(s)
- B Epel
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot 76100, Israel
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Derweesh IH, Flechner SM, Modlin C, Mastroianni B, Savas K, Krishnamurthi V, Goldfarb D. Ipsilateral dual-kidney transplantation using organs declined by other centers. Transplant Proc 2003; 35:856-7. [PMID: 12644165 DOI: 10.1016/s0041-1345(02)04028-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- I H Derweesh
- Section of Renal Transplantation, Urological Institute, Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA
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Arieli D, Delabie A, Groothaert M, Pierloot K, Goldfarb D. The Process of Mn(II) Incorporation into Aluminophosphate Zeotypes through High-Field ENDOR Spectroscopy and DFT Calculations. J Phys Chem B 2002. [DOI: 10.1021/jp020684s] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- D. Arieli
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot, Israel, 76100, and Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B-3001 Heverlee-Leuven, Belgium, and Center for Surface Chemistry and Catalysis, University of Leuven, Kasteelpark Arenberg 23, B-3001 Heverlee-Leuven, Belgium
| | - A. Delabie
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot, Israel, 76100, and Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B-3001 Heverlee-Leuven, Belgium, and Center for Surface Chemistry and Catalysis, University of Leuven, Kasteelpark Arenberg 23, B-3001 Heverlee-Leuven, Belgium
| | - M. Groothaert
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot, Israel, 76100, and Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B-3001 Heverlee-Leuven, Belgium, and Center for Surface Chemistry and Catalysis, University of Leuven, Kasteelpark Arenberg 23, B-3001 Heverlee-Leuven, Belgium
| | - K. Pierloot
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot, Israel, 76100, and Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B-3001 Heverlee-Leuven, Belgium, and Center for Surface Chemistry and Catalysis, University of Leuven, Kasteelpark Arenberg 23, B-3001 Heverlee-Leuven, Belgium
| | - D. Goldfarb
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot, Israel, 76100, and Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B-3001 Heverlee-Leuven, Belgium, and Center for Surface Chemistry and Catalysis, University of Leuven, Kasteelpark Arenberg 23, B-3001 Heverlee-Leuven, Belgium
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Arieli D, Delabie A, Vaughan DEW, Strohmaier KG, Goldfarb D. Isomorphous Substitution of Mn(II) into Aluminophosphate Zeotypes: A Combined High-Field ENDOR and DFT Study. J Phys Chem B 2002. [DOI: 10.1021/jp020502u] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- D. Arieli
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot, Israel, 76100, Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B-3001 Heverlee-Leuven, Belgium, Materials Research Laboratory, Pennsylvania State University, University Park, Pennsylvania 16802, and Exxon Research and Engineering Company, Route 22 East, Annandale, New Jersey 08801
| | - A. Delabie
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot, Israel, 76100, Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B-3001 Heverlee-Leuven, Belgium, Materials Research Laboratory, Pennsylvania State University, University Park, Pennsylvania 16802, and Exxon Research and Engineering Company, Route 22 East, Annandale, New Jersey 08801
| | - D. E. W. Vaughan
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot, Israel, 76100, Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B-3001 Heverlee-Leuven, Belgium, Materials Research Laboratory, Pennsylvania State University, University Park, Pennsylvania 16802, and Exxon Research and Engineering Company, Route 22 East, Annandale, New Jersey 08801
| | - K. G. Strohmaier
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot, Israel, 76100, Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B-3001 Heverlee-Leuven, Belgium, Materials Research Laboratory, Pennsylvania State University, University Park, Pennsylvania 16802, and Exxon Research and Engineering Company, Route 22 East, Annandale, New Jersey 08801
| | - D. Goldfarb
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot, Israel, 76100, Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B-3001 Heverlee-Leuven, Belgium, Materials Research Laboratory, Pennsylvania State University, University Park, Pennsylvania 16802, and Exxon Research and Engineering Company, Route 22 East, Annandale, New Jersey 08801
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Gordon SM, Carey W, Yen-Lieberman B, Dennis V, Nurko S, Hoeltge G, Goldfarb D. A fatal case of hepatitis C seroconversion following living related kidney transplantation: another argument for nucleic acid amplification testing of transplant recipients and donors. Transpl Infect Dis 2002; 4:113-4. [PMID: 12220250 DOI: 10.1034/j.1399-3062.2002.02001.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Thomann H, Bernardo M, Goldfarb D, Kroneck PMH, Ullrich V. Evidence for Water Binding to the Fe Center in Cytochrome P450cam Obtained by 17O Electron Spin-Echo Envelope Modulation Spectroscopy. J Am Chem Soc 2002. [DOI: 10.1021/ja00136a023] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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