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Agnese R, Aralis T, Aramaki T, Arnquist IJ, Azadbakht E, Baker W, Banik S, Barker D, Bauer DA, Binder T, Bowles MA, Brink PL, Bunker R, Cabrera B, Calkins R, Cartaro C, Cerdeño DG, Chang YY, Cooley J, Cornell B, Cushman P, Di Stefano PCF, Doughty T, Fascione E, Figueroa-Feliciano E, Fink C, Fritts M, Gerbier G, Germond R, Ghaith M, Golwala SR, Harris HR, Hong Z, Hoppe EW, Hsu L, Huber ME, Iyer V, Jardin D, Jena C, Kelsey MH, Kennedy A, Kubik A, Kurinsky NA, Lawrence RE, Leyva JV, Loer B, Lopez Asamar E, Lukens P, MacDonell D, Mahapatra R, Mandic V, Mast N, Miller EH, Mirabolfathi N, Mohanty B, Morales Mendoza JD, Nelson J, Orrell JL, Oser SM, Page WA, Partridge R, Pepin M, Phipps A, Ponce F, Poudel S, Pyle M, Qiu H, Rau W, Reisetter A, Reynolds T, Roberts A, Robinson AE, Rogers HE, Romani RK, Saab T, Sadoulet B, Sander J, Scarff A, Schnee RW, Scorza S, Senapati K, Serfass B, So J, Speller D, Stanford C, Stein M, Street J, Tanaka HA, Toback D, Underwood R, Villano AN, von Krosigk B, Watkins SL, Wilson JS, Wilson MJ, Winchell J, Wright DH, Yellin S, Young BA, Zhang X, Zhao X. First Dark Matter Constraints from a SuperCDMS Single-Charge Sensitive Detector. PHYSICAL REVIEW LETTERS 2018; 121:051301. [PMID: 30118251 DOI: 10.1103/physrevlett.121.051301] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Revised: 06/20/2018] [Indexed: 06/08/2023]
Abstract
We present the first limits on inelastic electron-scattering dark matter and dark photon absorption using a prototype SuperCDMS detector having a charge resolution of 0.1 electron-hole pairs (CDMS HVeV, a 0.93 g CDMS high-voltage device). These electron-recoil limits significantly improve experimental constraints on dark matter particles with masses as low as 1 MeV/c^{2}. We demonstrate a sensitivity to dark photons competitive with other leading approaches but using substantially less exposure (0.49 g d). These results demonstrate the scientific potential of phonon-mediated semiconductor detectors that are sensitive to single electronic excitations.
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Agnese R, Aramaki T, Arnquist IJ, Baker W, Balakishiyeva D, Banik S, Barker D, Basu Thakur R, Bauer DA, Binder T, Bowles MA, Brink PL, Bunker R, Cabrera B, Caldwell DO, Calkins R, Cartaro C, Cerdeño DG, Chang Y, Chen Y, Cooley J, Cornell B, Cushman P, Daal M, Di Stefano PCF, Doughty T, Fascione E, Figueroa-Feliciano E, Fritts M, Gerbier G, Germond R, Ghaith M, Godfrey GL, Golwala SR, Hall J, Harris HR, Hong Z, Hoppe EW, Hsu L, Huber ME, Iyer V, Jardin D, Jastram A, Jena C, Kelsey MH, Kennedy A, Kubik A, Kurinsky NA, Loer B, Lopez Asamar E, Lukens P, MacDonell D, Mahapatra R, Mandic V, Mast N, Miller EH, Mirabolfathi N, Mohanty B, Morales Mendoza JD, Nelson J, Orrell JL, Oser SM, Page K, Page WA, Partridge R, Penalver Martinez M, Pepin M, Phipps A, Poudel S, Pyle M, Qiu H, Rau W, Redl P, Reisetter A, Reynolds T, Roberts A, Robinson AE, Rogers HE, Saab T, Sadoulet B, Sander J, Schneck K, Schnee RW, Scorza S, Senapati K, Serfass B, Speller D, Stein M, Street J, Tanaka HA, Toback D, Underwood R, Villano AN, von Krosigk B, Welliver B, Wilson JS, Wilson MJ, Wright DH, Yellin S, Yen JJ, Young BA, Zhang X, Zhao X. Results from the Super Cryogenic Dark Matter Search Experiment at Soudan. PHYSICAL REVIEW LETTERS 2018; 120:061802. [PMID: 29481237 DOI: 10.1103/physrevlett.120.061802] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Revised: 01/02/2018] [Indexed: 06/08/2023]
Abstract
We report the result of a blinded search for weakly interacting massive particles (WIMPs) using the majority of the SuperCDMS Soudan data set. With an exposure of 1690 kg d, a single candidate event is observed, consistent with expected backgrounds. This analysis (combined with previous Ge results) sets an upper limit on the spin-independent WIMP-nucleon cross section of 1.4×10^{-44} (1.0×10^{-44}) cm^{2} at 46 GeV/c^{2}. These results set the strongest limits for WIMP-germanium-nucleus interactions for masses >12 GeV/c^{2}.
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Ramteke P, Seenu V, Prashad R, Gupta SD, Iyer V, Deo S, Gogia A, Mathur S. Alteration in steroid hormone and Her-2/neu receptor status following neoadjuvant chemotherapy in locally advanced breast cancer: Experience at a tertiary care centre in India. Indian J Cancer 2017; 53:366-371. [PMID: 28244460 DOI: 10.4103/0019-509x.200669] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
CONTEXT Use of neoadjuvant chemotherapy (NACT) in locally advanced breast cancer (LABC) enables tumor reduction and conservative surgery. It is proposed in some studies that there may be an alteration in the hormonal receptor (HR) status and human epidermal growth factor receptor 2 (Her-2)/neu immune-expression following NACT. AIMS To study the status of estrogen receptor (ER), progesterone receptor (PR), and Her-2/neu receptor before and after NACT in LABC. MATERIALS AND METHODS HR and Her-2/neu status were evaluated by immunohistochemistry on 100 core needle biopsy of primary tumors and surgical specimens after receiving NACT (NACT group); fifty patients without NACT served as non-NACT group, and discordance was compared between the two groups. RESULTS In the NACT group, discordance of 17%, 13%, and 11% was noted in ER, PR, and Her-2/neu status, while in non-NACT group, discordance seen in ER, PR, and Her-2/neu was 8%, 8%, and 4%, respectively. CONCLUSIONS There was a significant alteration in ER and Her-2/neu status from the core biopsy to the treated resected tumor in the study group. As these changes may impact treatment, HR and Her-2/neu expression reanalysis in final surgical specimens is recommended.
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Bohnen MS, Peng G, Robey SH, Terrenoire C, Iyer V, Sampson KJ, Kass RS. Molecular Pathophysiology of Congenital Long QT Syndrome. Physiol Rev 2017; 97:89-134. [PMID: 27807201 PMCID: PMC5539372 DOI: 10.1152/physrev.00008.2016] [Citation(s) in RCA: 107] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Ion channels represent the molecular entities that give rise to the cardiac action potential, the fundamental cellular electrical event in the heart. The concerted function of these channels leads to normal cyclical excitation and resultant contraction of cardiac muscle. Research into cardiac ion channel regulation and mutations that underlie disease pathogenesis has greatly enhanced our knowledge of the causes and clinical management of cardiac arrhythmia. Here we review the molecular determinants, pathogenesis, and pharmacology of congenital Long QT Syndrome. We examine mechanisms of dysfunction associated with three critical cardiac currents that comprise the majority of congenital Long QT Syndrome cases: 1) IKs, the slow delayed rectifier current; 2) IKr, the rapid delayed rectifier current; and 3) INa, the voltage-dependent sodium current. Less common subtypes of congenital Long QT Syndrome affect other cardiac ionic currents that contribute to the dynamic nature of cardiac electrophysiology. Through the study of mutations that cause congenital Long QT Syndrome, the scientific community has advanced understanding of ion channel structure-function relationships, physiology, and pharmacological response to clinically employed and experimental pharmacological agents. Our understanding of congenital Long QT Syndrome continues to evolve rapidly and with great benefits: genotype-driven clinical management of the disease has improved patient care as precision medicine becomes even more a reality.
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Sharma JB, Singh N, Dharmendra S, Singh UB, P V, Kumar S, Roy KK, Hari S, Iyer V, Sharma SK. Six months versus nine months anti-tuberculous therapy for female genital tuberculosis: a randomized controlled trial. Eur J Obstet Gynecol Reprod Biol 2016; 203:264-73. [PMID: 27391900 DOI: 10.1016/j.ejogrb.2016.05.035] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2016] [Revised: 05/19/2016] [Accepted: 05/21/2016] [Indexed: 10/21/2022]
Abstract
OBJECTIVE To compare six months versus nine months anti-tuberculous therapy in patients of female genital tuberculosis. STUDY DESIGN It was a randomized controlled trial in a tertiary referral center teaching institute on 175 women presenting with infertility and found to have female genital tuberculosis on clinical examination and investigations. Group I women (86 women) were given 9 months of intermitted anti-tuberculous therapy under directly observed treatment short course (DOTS) strategy while Group II (89 women) were given 6 months of anti-tuberculous therapy under DOTS. Patients were evaluated for primary end points (complete cure, partial response, no response) and secondary end points (recurrence rate, pregnancy rate) during treatment. All patients were followed up further for one year after completion of therapy to assess recurrence of disease and further pregnancies. RESULTS Baseline characteristics were similar between two randomized groups. There was no difference in the complete clinical response rate (95.3% vs 97.7%, p=0.441) between 9-months and 6-months groups. Four patients in 9-months group and two patients in 6-months group had recurrence of disease and required category II anti tuberculous therapy (p=0.441). Pregnancy rate during treatment and up to one year follow up was also similar in the two groups (23.2% vs 21.3%, p=0.762). Side effects occurred in 27(31.4%) and 29(32.6%) in 9-months and 6-months of therapy and were similar (p=0.866). CONCLUSIONS There was no difference in complete cure rate, recurrent rate and pregnancy rate for either 6-months or 9-months of intermittent directly observed treatment short course anti-tuberculous therapy in female genital tuberculosis. CLINICAL TRIAL REGISTRATION The trial was registered in clinicaltrials.gov with registration no: CTRI/2009/091/001088.
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Alzahrani M, El-Galaly TC, Hutchings M, Hansen JW, Loft A, Johnsen HE, Iyer V, Wilson D, Sehn LH, Savage KJ, Connors JM, Gascoyne RD, Johansen P, Clasen-Linde E, Brown P, Villa D. The value of routine bone marrow biopsy in patients with diffuse large B-cell lymphoma staged with PET/CT: a Danish-Canadian study. Ann Oncol 2016; 27:1095-1099. [PMID: 27002106 DOI: 10.1093/annonc/mdw137] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2016] [Accepted: 03/10/2016] [Indexed: 12/28/2022] Open
Abstract
BACKGROUND The added diagnostic and prognostic value of routine bone marrow biopsy (BMB) in patients with diffuse large B-cell lymphoma (DLBCL) undergoing positron emission tomography combined with computed tomography (PET/CT) staging is controversial. PATIENTS AND METHODS Patients with newly diagnosed DLBCL who underwent both staging PET/CT and BMB were retrospectively identified in British Columbia, Aalborg, and Copenhagen. Original written PET/CT and pathology reports were retrospectively reviewed to determine Ann Arbor stage and outcomes, with and without the contribution of BMB. RESULTS A total of 530 patients were identified: 146 (28%) had focal bone marrow (BM) lesions on PET/CT and 87 (16%) had positive BMB. Fifty-two of 146 patients (36%) with positive PET/CT had a positive BMB [39 DLBCL, 13 indolent non-Hodgkin lymphoma (iNHL)], while 35 of 384 patients (9%) with negative PET/CT had positive BMB (12 DLBCL, 23 iNHL). BMB upstaged 12/209 (6%) of stage I/II patients to stage IV, although this was the case for only 3 (1%) patients with DLBCL in the BMB. PET/CT identified BM involvement by BMB with sensitivity 60%, specificity 79%, positive predictive value 36%, and negative predictive value 91%. Concordant histological involvement of the BM by DLBCL was associated with worse overall survival and progression-free survival than discordant or no involvement in univariate and multivariate analyses. CONCLUSIONS In patients with DLBCL, staging PET/CT can miss BM involvement with concordant DLBCL (less common) or discordant iNHL (more common). Routine BMB does not add relevant diagnostic or prognostic value over PET/CT alone in the majority of patients with DLBCL.
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Iyer V, McKusick M, Friese J, Bjarnason H, Stockland A, Fleming C, Andrews J. Outcomes of IVC stenting with Gianturco-Z stents in non-thrombotic IVC stenosis: a 11-year experience. J Vasc Interv Radiol 2016. [DOI: 10.1016/j.jvir.2015.12.367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Kaloff C, Anastassiadis K, Ayadi A, Baldock R, Beig J, Birling MC, Bradley A, Brown S, Bürger A, Bushell W, Chiani F, Collins F, Doe B, Eppig J, Finnell R, Fletcher C, Flicek P, Fray M, Friedel R, Gambadoro A, Gates H, Hansen J, Herault Y, Hicks G, Hörlein A, Hrabé de Angelis M, Iyer V, de Jong P, Koscielny G, Kühn R, Liu P, Lloyd K, Lopez R, Marschall S, Martínez S, McKerlie C, Meehan T, von Melchner H, Moore M, Murray S, Nagy A, Nutter L, Pavlovic G, Pombero A, Prosser H, Ramirez-Solis R, Ringwald M, Rosen B, Rosenthal N, Rossant J, Ruiz Noppinger P, Ryder E, Skarnes W, Schick J, Schnütgen F, Schofield P, Seisenberger C, Selloum M, Smedley D, Simpson E, Stewart A, Teboul L, Tocchini Valentini G, Valenzuela D, West A, Wurst W. Genome wide conditional mouse knockout resources. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.ddmod.2017.08.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Kumar A, Rani L, Matur N, Maqbool M, Gupta R, Iyer V, Sundar D, Pal S, Shukla N, Thulkar S, Sharma A. To Study the Gene Expression Profile of Advanced Gall Bladder Cancer. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu334.109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Brognaro E, Chang S, Cha J, Choi K, Choi C, DePetro J, Binding C, Blough M, Kelly J, Lawn S, Chan J, Weiss S, Cairncross G, Eisenbeis A, Goldbrunner R, Timmer M, Gabrusiewicz K, Cortes-Santiago N, Fan X, Hossain MB, Kaminska B, Heimberger A, Rao G, Yung WKA, Marini F, Fueyo J, Gomez-Manzano C, Halle B, Marcusson E, Aaberg-Jessen C, Jensen SS, Meyer M, Schulz MK, Andersen C, Bjarne, Kristensen W, Hashizume R, Ihara Y, Ozawa T, Parsa A, Clarke J, Butowski N, Prados M, Perry A, McDermott M, James D, Jensen R, Gillespie D, Martens T, Zamykal M, Westphal M, Lamszus K, Monsalves E, Jalali S, Tateno T, Ezzat S, Zadeh G, Nedergaard MK, Kristoffersen K, Poulsen HS, Stockhausen MT, Lassen U, Kjaer A, Ohka F, Natsume A, Zong H, Liu C, Hatanaka A, Katsushima K, Shinjo K, Wakabayashi T, Kondo Y, Picotte K, Li L, Westerhuis B, Zhao H, Plotkin S, James M, Kalamarides M, Zhao WN, Kim J, Stemmer-Rachamimov A, Haggarty S, Gusella J, Ramesh V, Nunes F, Rao G, Doucette T, Yang Y, Fuller G, Rao A, Schmidt NO, Humke N, Meissner H, Mueller FJ, Westphal M, Schnell O, Jaehnert I, Albrecht V, Fu P, Tonn JC, Schichor C, Shackleford G, Swanson K, Shi XH, D'Apuzzo M, Gonzalez-Gomez I, Sposto R, Seeger R, Erdreich-Epstein A, Moats R, Sirianni RW, Heffernan JM, Overstreet DJ, Sleire L, Skeie BS, Netland IA, Heggdal J, Pedersen PH, Enger PO, Stiles C, Sun Y, Mehta S, Taylor C, Alberta J, Sundstrom T, Wendelbo I, Daphu I, Hodneland E, Lundervold A, Immervoll H, Skaftnesmo KO, Babic M, Jendelova P, Sykova E, Lund-Johansen M, Bjerkvig R, Thorsen F, Synowitz M, Ku MC, Wolf SA, Respondek D, Matyash V, Pohlmann A, Waiczies S, Waiczies H, Niendorf T, Glass R, Kettenmann H, Thompson N, Elder D, Hopkins K, Iyer V, Cohen N, Tavare J, Thorsen F, Fite B, Mahakian LM, Seo JW, Qin S, Harrison V, Sundstrom T, Harter PN, Johnson S, Ingham E, Caskey C, Meade T, Skaftnesmo KO, Ferrara KW, Tschida BR, Lowy AR, Marek CA, Ringstrom T, Beadnell TJ, Wiesner SM, Largaespada DA, Wenger C, Miranda PC, Mekonnen A, Salvador R, Basser P, Yoon J, Shin H, Choi K, Choi C. TUMOR MODELS (IN VIVO/IN VITRO). Neuro Oncol 2013. [DOI: 10.1093/neuonc/not193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Huber K, Iyer V, Huber W, Wazer D. Sequence Dependent Radiosensitization of EGFR Mutant Non-small Cell Lung Cancer by Gefitinib Is Mediated by Senescence. Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Birks S, Altinkaya M, Altinkaya A, Pilkington G, Kurian KM, Crosby C, Hopkins K, Williams M, Donovan L, Birks S, Eason A, Bosak V, Pilkington G, Birks S, Holliday J, Corbett I, Pilkington G, Keeling M, Bambrough J, Simpson J, Higgins S, Dogra H, Pilkington G, Kurian KM, Zhang Y, Bradley M, Schmidberger C, Hafizi S, Noorani I, Price S, Dubocq A, Jaunky T, Chatelain C, Evans L, Gaissmaier T, Pilkington GJ, An Q, Hurwitz V, Logan J, Bhangoo R, Ashkan K, Gullan A, Beaney R, Brazil L, Kokkinos S, Blake R, Singleton A, Shaw A, Iyer V, Kurian KM, Jeyapalan JN, Morley IC, Hill AA, Mumin MA, Tatevossian RG, Qaddoumi I, Ellison DW, Sheer D, Frary A, Price S, Jefferies S, Harris F, Burnet N, Jena R, Watts C, Haylock B, Leow-Dyke S, Rathi N, Wong H, Dunn J, Baborie A, Crooks D, Husband D, Shenoy A, Brodbelt A, Walker C, Bahl A, Larsen J, Craven I, Metherall P, McKevitt F, Romanowski C, Hoggard N, Jellinek DA, Bell S, Murray E, Muirhead R, James A, Hanzely Z, Jackson R, Stewart W, O'Brien A, Young A, Bell S, Hanzely Z, Stewart W, Shepherd S, Cavers D, Wallace L, Hacking B, Scott S, Bowyer D, Elmahdi A, Frary AJ, O'Donovan DG, Price SJ, Kia A, Przystal JM, Nianiaris N, Mazarakis ND, Mintz PJ, Hajitou A, Karakoula K, Phipps K, Harkness W, Hayward R, Thompson D, Jacques T, Harding B, Darling J, Warr T, Leow-Dyke S, Rathi N, Haylock B, Crooks D, Jenkinson M, Walker C, Brodbelt A, Zhou L, Ercolano E, Ammoun S, Schmid MC, Barczyk M, Hanemann CO, Rowther F, Dawson T, Ashton K, Darling J, Warr T, Maherally Z, Hatherell KE, Kroese K, Hafizi S, Pilkington GJ, Singh P, McQuaid S, Al-Rashid S, Prise K, Herron B, Healy E, Shoakazemi A, Donnelly M, McConnell R, Harney J, Conkey D, McGrath E, Lunsford L, Kondziolka D, Niranjan A, Kano H, Hamilton R, Flannery T, Majani Y, Smith S, Grundy R, Rahman R, Saini S, Hall G, Davis C, Rowther F, Lawson T, Ashton K, Potter N, Goessl E, Darling J, Warr T, Brodbelt A, Jenkinson M, Walker C, Leow-Dyke S, Haylock B, Dunn J, Wilkins S, Smith T, Petinou V, Nicholl I, Singh J, Lea R, Welsby P, Spiteri I, Sottoriva A, Marko N, Tavare S, Collins P, Price SJ, Watts C, Su Z, Gerhard A, Hinz R, Roncaroli F, Coope D, Thompson G, Karabatsou K, Sofat A, Leggate J, du Plessis D, Turkheimer F, Jackson A, Brodbelt A, Jenkinson M, Das K, Crooks D, Herholz K, Price SJ, Whittle IR, Ashkan K, Grundy P, Cruickshank G, Berry V, Elder D, Iyer V, Hopkins K, Cohen N, Tavare J, Zilidis G, Tibarewal P, Spinelli L, Leslie NR, Coope DJ, Karabatsou K, Green S, Wall G, Bambrough J, Brennan P, Baily J, Diaz M, Ironside J, Sansom O, Brunton V, Frame M, Young A, Thomas O, Mohsen L, Frary A, Lupson V, McLean M, Price S, Arora M, Shaw L, Lawrence C, Alder J, Dawson T, Hall G, Rada L, Chen K, Shivane A, Ammoun S, Parkinson D, Hanemann C, Pangeni RP, Warr TJ, Morris MR, Mackinnon M, Williamson A, James A, Chalmers A, Beckett V, Joannides A, Brock R, McCarthy K, Price S, Singh A, Karakoula K, Dawson T, Ashton K, Darling J, Warr T, Kardooni H, Morris M, Rowther F, Darling J, Warr T, Watts C, Syed N, Roncaroli F, Janczar K, Singh P, O'Neil K, Nigro CL, Lattanzio L, Coley H, Hatzimichael E, Bomalaski J, Szlosarek P, Crook T, Pullen NA, Anand M, Birks S, Van Meter T, Pullen NA, Anand M, Williams S, Boissinot M, Steele L, Williams S, Chiocca EA, Lawler S, Al Rashid ST, Mashal S, Taggart L, Clarke E, Flannery T, Prise KM. Abstracts from the 2012 BNOS Conference. Neuro Oncol 2012. [DOI: 10.1093/neuonc/nos198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Grankvist J, Fisker R, Iyer V, Fründ E, Simonsen C, Christensen T, Stenbygaard L, Ewertz M, Larsson EM. MRI and PET/CT of patients with bone metastases from breast carcinoma. Eur J Radiol 2012; 81:e13-8. [DOI: 10.1016/j.ejrad.2010.10.024] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2010] [Revised: 10/14/2010] [Accepted: 10/20/2010] [Indexed: 11/25/2022]
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Fernandes TA, Iyer V, Apte SK. Differential responses of nitrogen-fixing cyanobacteria to salinity and osmotic stresses. Appl Environ Microbiol 2010; 59:899-904. [PMID: 16348897 PMCID: PMC202205 DOI: 10.1128/aem.59.3.899-904.1993] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Two nitrogen-fixing Anabaena strains were found to be differentially tolerant to salinity and osmotic stresses. Anabaena torulosa, a brackish-water, salt-tolerant strain, was relatively osmosensitive. Anabaena sp. strain L-31, a freshwater, salt-sensitive strain, on the other hand, displayed significant osmotolerance. Salinity and osmotic stresses affected nitrogenase activity differently. Nitrogen fixation in both of the strains was severely inhibited by the ionic, but not by the osmotic, component of salinity stress. Such differential sensitivity of diazotrophy to salinity-osmotic stresses was observed irrespective of the inherent tolerance of the two strains to salt-osmotic stress. Exogenously added ammonium conferred significant protection against salinity stress but was ineffective against osmotic stress. Salinity and osmotic stresses also affected stress-induced gene expression differently. Synthesis of several proteins was repressed by salinity stress but not by equivalent or higher osmotic stress. Salinity and osmotic stresses induced many common proteins. In addition, unique salt stress- or osmotic stress-specific proteins were also induced in both strains, indicating differential regulation of protein synthesis by the two stresses. These data show that cyanobacterial sensitivity and responses to salinity and osmotic stresses are distinct, independent phenomena.
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Sampson KJ, Iyer V, Marks AR, Kass RS. A computational model of Purkinje fibre single cell electrophysiology: implications for the long QT syndrome. J Physiol 2010; 588:2643-55. [PMID: 20498233 DOI: 10.1113/jphysiol.2010.187328] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Computer modelling has emerged as a particularly useful tool in understanding the physiology and pathophysiology of cardiac tissues. Models of ventricular, atrial and nodal tissue have evolved and include detailed ion channel kinetics and intercellular Ca(2+) handling. Purkinje fibre cells play a central role in the electrophysiology of the heart and in the genesis of cardiac arrhythmias. In this study, a new computational model has been constructed that incorporates the major membrane currents that have been isolated in recent experiments using Purkinje fibre cells. The model, which integrates mathematical models of human ion channels based on detailed biophysical studies of their kinetic and voltage-dependent properties, recapitulates distinct electrophysiological characteristics unique to Purkinje fibre cells compared to neighbouring ventricular myocytes. These characteristics include automaticity, hyperpolarized voltage range of the action potential plateau potential, and prolonged action potential duration. Simulations of selective ion channel blockade reproduce responses to pharmacological challenges characteristic of isolated Purkinje fibres in vitro, and importantly, the model predicts that Purkinje fibre cells are prone to severe arrhythmogenic activity in patients harbouring long QT syndrome 3 but much less so for other common forms of long QT. This new Purkinje cellular model can be a useful tool to study tissue-specific drug interactions and the effects of disease-related ion channel dysfunction on the cardiac conduction system.
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Joshi A, Iyer V, Hagan J, St. Sauver J, Boyce T. Low T Cell Count is Associated with Development of Malignancy in CVID: A Population Based Cohort Study. J Allergy Clin Immunol 2009. [DOI: 10.1016/j.jaci.2008.12.1024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Bharadwaj R, Joshi A, Iyer V, Balasubramaniam U, Kagal A. Comparison of efficacy of three commercially available antibiotic discs. Indian J Med Microbiol 2008; 26:160-2. [DOI: 10.4103/0255-0857.40533] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Erdemir E, Hoffmann K, Walczak A, Dashkoff N, Iyer V, Gopal A. SU-FF-I-125: Accuracy and Reliability of Manual Vessel Sizing Measurements Among Different Users and Systems. Med Phys 2007. [DOI: 10.1118/1.2760501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Vining C, Iyer V, Bhatnagar S. Intracerebroventricular administration of corticotrophin-releasing hormone receptor antagonists produces different effects on hypothalamic pituitary adrenal responses to novel restraint depending on the stress history of the animal. J Neuroendocrinol 2007; 19:198-207. [PMID: 17280593 DOI: 10.1111/j.1365-2826.2006.01522.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Corticotrophin-releasing hormone (CRH) regulates acute stress-induced changes in neuroendocrine function and behaviour. However, little is known about CRH functions in animals that have prior experience with repeated stress. Repeatedly-stressed rats exhibit a habituated hypothalamic-pituitary-adrenal (HPA) response to a familiar, homotypic stressor but exhibit maintained or enhanced HPA responses to a novel, heterotypic stressor. We examined the effects of intracerebroventricular (i.c.v.) administration of two different nonselective CRH receptor antagonists, alpha-helical CRH(9-41) (ahCRH) or D-Phe CRH(12-41) (D-PheCRH), on HPA responses to acute restraint in rats previously exposed to repeated cold stress (i.e. facilitated responses). Antagonists were administered as single i.c.v. injections prior to restraint to provide a general index of CRH function in control versus repeatedly-stressed rats. CRH receptor blockade with either ahCRH or D-PheCRH produced different effects on HPA responses to novel restraint depending on whether the animal had been previously cold stressed or not. Interestingly, some agonist-type effects were observed but only in repeatedly-stressed rats. In summary, these results indicate that manipulations of the CRH receptor have different effects on HPA activity depending on the stress history of the animal.
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Kuchi P, Iyer V, Hiremagalur R, Panchanathan S. Characteristics of gait of humans with incomplete spinal cord injury. CONFERENCE PROCEEDINGS : ... ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL CONFERENCE 2007; 2006:586-9. [PMID: 17271744 DOI: 10.1109/iembs.2004.1403225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Epidural spinal cord stimulation has been demonstrated to help the recovery of walking abilities of patients with incomplete spinal cord injury when combined with partial weight bearing therapy. However, no work has been done in studying the dynamics of these signals generated with and without stimulation. We show that the underlying dynamics of such signals is chaotic. We also estimate the correlation dimension of these signals and show the difference in the dynamics of gait with and without stimulation using the kinematic data of right knee and right hip. The correlation dimension thus estimated can be used to evaluate the efficiency of epidural spinal cord stimulation in patients.
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Bosiers M, Iyer V, Deloose K, Verbist J, Peeters P. Flemish experience using the Advanta V12 stent-graft for the treatment of iliac artery occlusive disease. THE JOURNAL OF CARDIOVASCULAR SURGERY 2007; 48:7-12. [PMID: 17308516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
AIM The aim of this study was to evaluate the technical feasibility and safety of implanting a polytetrafluoroethylene (PTFE) covered balloon expandable stent to treat iliac artery stenoses and occlusions. Additionally, the primary patency and clinical and hemodynamic efficacy at 1 year were analysed. METHODS This nonrandomized, prospective study involved patients with claudication and iliac artery occlusive disease at 2 participating centres. Patients with suitable lesions determined by clinical examination, ankle-brachial indices (ABIs), colour-flow duplex ultrasound (CFDU), magnetic resonance angiogram (MRA) and confirmed with biplanar digital subtraction angiography (DSA) were treated with PTFE-covered stainless steel stents. Procedural and 30-day periprocedural complications were recorded prospectively. According to in-hospital standards, follow-up with clinical ischemia category determination, ABI and CFDU was performed at 1, 6 and 12 months to determine treatment efficacy and primary limb patency. RESULTS In total, 91 limbs were treated in 65 patients (51 male; mean age 65 years). Stent-graft deployment was successful in 91 (100%) limbs. There were no limbs with residual stenosis >30%. There were no procedural or 30-day complications. The clinical ischemia category distribution improved significantly at 1, 6 and 12 months. The mean ABI rose significantly from 0.59 before treatment to 0.98, 0.98 and 0.99 at 1, 6 and 12 months after the procedure. Primary limb patency at 1-year was 91.1% CONCLUSIONS Implantation of Advanta V12 PTFE-covered stent for iliac occlusive disease shows to be safe and feasible with excellent clinical results at 1 year in the investigated patient cohort.
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Gupte T, Iyer V, Damle SG, Malik N, Halbe A. Osteogenesis imperfecta. J Indian Soc Pedod Prev Dent 2006; 24 Suppl 1:S44-6. [PMID: 16891753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/08/2023] Open
Abstract
Osteogenesis imperfecta is an inherited disorder of the connective tissue. The extreme bone fragility seen in patients suffering from osteogenesis imperfecta pose a series of problems with regard to behavior management and rendering of quality dental treatment. Presented here a case of a four year old child suffering from osteogenesis imperfecta.
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Birney E, Andrews D, Caccamo M, Chen Y, Clarke L, Coates G, Cox T, Cunningham F, Curwen V, Cutts T, Down T, Durbin R, Fernandez-Suarez XM, Flicek P, Gräf S, Hammond M, Herrero J, Howe K, Iyer V, Jekosch K, Kähäri A, Kasprzyk A, Keefe D, Kokocinski F, Kulesha E, London D, Longden I, Melsopp C, Meidl P, Overduin B, Parker A, Proctor G, Prlic A, Rae M, Rios D, Redmond S, Schuster M, Sealy I, Searle S, Severin J, Slater G, Smedley D, Smith J, Stabenau A, Stalker J, Trevanion S, Ureta-Vidal A, Vogel J, White S, Woodwark C, Hubbard TJP. Ensembl 2006. Nucleic Acids Res 2006; 34:D556-61. [PMID: 16381931 PMCID: PMC1347495 DOI: 10.1093/nar/gkj133] [Citation(s) in RCA: 323] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
The Ensembl () project provides a comprehensive and integrated source of annotation of large genome sequences. Over the last year the number of genomes available from the Ensembl site has increased from 4 to 19, with the addition of the mammalian genomes of Rhesus macaque and Opossum, the chordate genome of Ciona intestinalis and the import and integration of the yeast genome. The year has also seen extensive improvements to both data analysis and presentation, with the introduction of a redesigned website, the addition of RNA gene and regulatory annotation and substantial improvements to the integration of human genome variation data.
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Bhatnagar S, Vining C, Iyer V, Kinni V. Changes in hypothalamic-pituitary-adrenal function, body temperature, body weight and food intake with repeated social stress exposure in rats. J Neuroendocrinol 2006; 18:13-24. [PMID: 16451216 DOI: 10.1111/j.1365-2826.2005.01375.x] [Citation(s) in RCA: 149] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
These present studies aimed to compare changes in hypothalamic-pituitary-adrenal (HPA) activity and body temperature in response to acute social defeat, to repeated social stress and to novel restraint after repeated stress, as well as to assess effects on metabolic parameters by measuring body weight gain and food and water intake. We found that social defeat produced a marked increase in both adrenocorticotrophic hormone and corticosterone compared to placement in a novel cage. Similarly, body temperature was also increased during social defeat and during 30 min of recovery from defeat. We then examined the effects of 6 days of repeated social stress and observed minimal HPA responses to repeated social stress compared to control rats. These neuroendocrine responses were contrasted by robust increases in body temperature during stress and during recovery from stress during 6 days of repeated stress. However, in response to novel restraint, repeatedly stressed rats displayed facilitated body temperature responses compared to controls, similar to our previous findings with HPA activity. Food intake was increased during the light period during which defeat took place, but later intake during the dark period was not affected. Repeated stress decreased body weight gain in the dark period but food intake was increased overall during the 6 days of repeated stress in the light period. As a result, repeated stress increased cumulative food intake during the light period in the stressed rats but these relatively small increases in food intake were unable to prevent the diminished total weight gain in repeatedly stressed rats. Overall, the results demonstrate that, although acute social defeat has similar effects on temperature and HPA activity, repeated exposure to social stress has divergent effects on HPA activity compared to body temperature and that dampened weight gain produced by repeated social stress cannot be fully explained by changes in food intake.
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Iyer V, Kato Y, Sano H, Yoneda M, Kaito T, Kanno T. Clip reconstruction for a case of peripheral posterior inferior cerebellar artery aneurysm: case report. MINIMALLY INVASIVE NEUROSURGERY : MIN 2005; 48:244-6. [PMID: 16172972 DOI: 10.1055/s-2005-870902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The authors report an unusual surgical treatment for an aneurysm on the left peripheral posterior inferior cerebellar artery (PICA). The computed tomographic scan showed subarachnoid haemorrhage and a haematoma in the left cerebellar region close to the fourth ventricle. The 3D CT angiography demonstrated an aneurysm on the left peripheral PICA which was confirmed on four-vessel angiography. The aneurysm was approached through a posterior suboccipital craniotomy and the PICA was reconstructed with multiple clips. The literature concerning peripheral PICA aneurysms and their treatment is reviewed and discussed.
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