101
|
Gupta A, Richardson M, Paquet M. Systematic Review of Oral Treatments for Seborrheic Dermatitis. J Eur Acad Dermatol Venereol 2013; 28:16-26. [DOI: 10.1111/jdv.12197] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2012] [Accepted: 05/15/2013] [Indexed: 11/26/2022]
|
102
|
Robb L, Richardson M, Peters A, Mullan CM, Robertson J, Intosh LM, Greening A, Rodgers H. 290 Relationship between serum 25-hydroxyvitamin D (25(OH)D) level and parathyroid hormone (PTH) level in adults with cystic fibrosis. J Cyst Fibros 2013. [DOI: 10.1016/s1569-1993(13)60431-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
103
|
Petrella R, Richardson M, Decaria J. THU0560 Hyaluronan Alone, Combined with Botulinus Toxin or Placebo Injection Therapy for Athletic Patients with Patellar Tendinopathy (Jumpers Knee). Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2013-eular.1088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
104
|
Ben Abda A, Hachulla E, Polge AS, Richardson M, Duva Pentiah A, Neicu D, De Groote P, Montaigne D, Lamblin N. Subclinical cardiac injury in systemic sclerosis assessed by speckle tracking strain analysis. Arch Cardiovasc Dis 2013. [DOI: 10.1016/j.acvd.2013.03.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
105
|
Perry D, Fine G, Richardson M. Atlavasc: an interactive vascular atlas. J Vasc Interv Radiol 2013. [DOI: 10.1016/j.jvir.2013.01.332] [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] Open
|
106
|
Vollmar C, O'Muirchearthaigh J, Symms M, Barker G, Thompson P, Kumari V, Duncan J, Richardson M, Koepp M. Nähe von Sprach-fMRT Aktivierung zu strukturellen Verbindungen des Sprachnetzwerkes korreliert mit Wortflüssigkeit bei Patienten mit linkseitiger Frontallappenepilepsie. KLIN NEUROPHYSIOL 2013. [DOI: 10.1055/s-0033-1337291] [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]
|
107
|
Braunlin E, Rosenfeld H, Kampmann C, Johnson J, Beck M, Giugliani R, Guffon N, Ketteridge D, Sá Miranda CM, Scarpa M, Schwartz IV, Leão Teles E, Wraith JE, Barrios P, Dias da Silva E, Kurio G, Richardson M, Gildengorin G, Hopwood JJ, Imperiale M, Schatz A, Decker C, Harmatz P. Enzyme replacement therapy for mucopolysaccharidosis VI: long-term cardiac effects of galsulfase (Naglazyme®) therapy. J Inherit Metab Dis 2013; 36:385-94. [PMID: 22669363 PMCID: PMC3590402 DOI: 10.1007/s10545-012-9481-2] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/17/2011] [Revised: 03/07/2012] [Accepted: 03/14/2012] [Indexed: 12/21/2022]
Abstract
Characteristic cardiac valve abnormalities and left ventricular hypertrophy are present in untreated patients with mucopolysaccharidosis type VI (MPS VI). Cardiac ultrasound was performed to investigate these findings in subjects during long-term enzyme replacement therapy (ERT) with recombinant human arylsulfatase B (rhASB, rhN-acetylgalactosamine 4-sulfatase, galsulfase, Naglazyme®). Studies were conducted in 54 subjects before ERT was begun and at specific intervals for up to 96 weeks of weekly infusions of rhASB at 1 mg/kg during phase 1/2, phase 2, and phase 3 trials of rhASB. At baseline, mitral and aortic valve obstruction was present and was significantly greater in those ≥12 years of age. Mild mitral and trace aortic regurgitation were present, the former being significantly greater in those <12 years. Left ventricular hypertrophy, with averaged z-scores ranging from 1.6-1.9 SD greater than normal, was present for ages both <12 and ≥12 years. After 96 weeks of ERT, ventricular septal hypertrophy regressed in those <12 years. For those ≥12 years, septal hypertrophy was unchanged, and aortic regurgitation increased statistically but not physiologically. Obstructive gradients across mitral and aortic valves remained unchanged. The results suggest that long-term ERT is effective in reducing intraventricular septal hypertrophy and preventing progression of cardiac valve abnormalities when administered to those <12 years of age.
Collapse
|
108
|
Marttila E, Bowyer P, Sanglard D, Uittamo J, Kaihovaara P, Salaspuro M, Richardson M, Rautemaa R. Fermentative 2-carbon metabolism produces carcinogenic levels of acetaldehyde in Candida albicans. Mol Oral Microbiol 2013; 28:281-91. [PMID: 23445445 DOI: 10.1111/omi.12024] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/14/2013] [Indexed: 01/24/2023]
Abstract
UNLABELLED Acetaldehyde is a carcinogenic product of alcohol fermentation and metabolism in microbes associated with cancers of the upper digestive tract. In yeast acetaldehyde is a by-product of the pyruvate bypass that converts pyruvate into acetyl-Coenzyme A (CoA) during fermentation. THE AIMS OF OUR STUDY WERE (i) to determine the levels of acetaldehyde produced by Candida albicans in the presence of glucose in low oxygen tension in vitro; (ii) to analyse the expression levels of genes involved in the pyruvate-bypass and acetaldehyde production; and (iii) to analyse whether any correlations exist between acetaldehyde levels, alcohol dehydrogenase enzyme activity or expression of the genes involved in the pyruvate-bypass. Candida albicans strains were isolated from patients with oral squamous cell carcinoma (n = 5), autoimmune polyendocrinopathy-candidiasis-ectodermal dystrophy (APECED) patients with chronic oral candidosis (n = 5), and control patients (n = 5). The acetaldehyde and ethanol production by these isolates grown under low oxygen tension in the presence of glucose was determined, and the expression of alcohol dehydrogenase (ADH1 and ADH2), pyruvate decarboxylase (PDC11), aldehyde dehydrogenase (ALD6) and acetyl-CoA synthetase (ACS1 and ACS2) and Adh enzyme activity were analysed. The C. albicans isolates produced high levels of acetaldehyde from glucose under low oxygen tension. The acetaldehyde levels did not correlate with the expression of ADH1, ADH2 or PDC11 but correlated with the expression of down-stream genes ALD6 and ACS1. Significant differences in the gene expressions were measured between strains isolated from different patient groups. Under low oxygen tension ALD6 and ACS1, instead of ADH1 or ADH2, appear the most reliable indicators of candidal acetaldehyde production from glucose.
Collapse
|
109
|
Malev E, Zemtsovsky E, Zhelninova T, Dubrovskaya O, Perevoznikova M, Rudakov M, Luneva E, Khaletskaya L, Shlyakhto E, Magne J, Mahjoub H, Pibarot P, Elhonsali Z, Dulgheru R, Lancellotti P, Pierard L, Magne J, Mahjoub H, Elhonsali Z, Bologne J, Dulgheru R, Pierard L, Pibarot P, Lancellotti P, Cameli M, Lisi M, Righini F, Massoni A, Natali B, Tacchini D, Maccherini M, Chiavarelli M, Massetti M, Mondillo S, Le Tourneau T, Deswartes G, Richardson M, Foucher C, Polge A, Fayad G, Vincentelli A, Lamblin N, Trochu J, Bauters C. Oral Abstract Session * New insights into primary mitral regurgitation: Valvular heart disease associated with systemic conditions and others. Eur Heart J Cardiovasc Imaging 2012. [DOI: 10.1093/ehjci/jes259] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
110
|
Raval R, Richardson M, Kumar R, Mills N, Katulis L, Quon H. Gabapentin Therapy for Prevention and Management of the Pain Syndrome in Oropharyngeal Carcinoma Patients Treated With Radiation: A Retrospective Study. Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.1739] [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]
|
111
|
Gosling C, Richardson M, Brown G, Hau R, Pirpiris M, Edwards E. Patient outcomes following traumatic fracture of the femoral shaft. Does surgical approach influence outcomes? Inj Prev 2012. [DOI: 10.1136/injuryprev-2012-040590b.13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
112
|
Zylstra AB, Frenje JA, Séguin FH, Rosenberg MJ, Rinderknecht HG, Johnson MG, Casey DT, Sinenian N, Manuel MJE, Waugh CJ, Sio HW, Li CK, Petrasso RD, Friedrich S, Knittel K, Bionta R, McKernan M, Callahan D, Collins GW, Dewald E, Döppner T, Edwards MJ, Glenzer S, Hicks DG, Landen OL, London R, Mackinnon A, Meezan N, Prasad RR, Ralph J, Richardson M, Rygg JR, Sepke S, Weber S, Zacharias R, Moses E, Kilkenny J, Nikroo A, Sangster TC, Glebov V, Stoeckl C, Olson R, Leeper RJ, Kline J, Kyrala G, Wilson D. Charged-particle spectroscopy for diagnosing shock ρR and strength in NIF implosions. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2012; 83:10D901. [PMID: 23126905 DOI: 10.1063/1.4729672] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The compact Wedge Range Filter (WRF) proton spectrometer was developed for OMEGA and transferred to the National Ignition Facility (NIF) as a National Ignition Campaign diagnostic. The WRF measures the spectrum of protons from D-(3)He reactions in tuning-campaign implosions containing D and (3)He gas; in this work we report on the first proton spectroscopy measurement on the NIF using WRFs. The energy downshift of the 14.7-MeV proton is directly related to the total ρR through the plasma stopping power. Additionally, the shock proton yield is measured, which is a metric of the final merged shock strength.
Collapse
|
113
|
Moore AS, Guymer TM, Kline JL, Morton J, Taccetti M, Lanier NE, Bentley C, Workman J, Peterson B, Mussack K, Cowan J, Prasad R, Richardson M, Burns S, Kalantar DH, Benedetti LR, Bell P, Bradley D, Hsing W, Stevenson M. A soft x-ray transmission grating imaging-spectrometer for the National Ignition Facility. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2012; 83:10E132. [PMID: 23126953 DOI: 10.1063/1.4742923] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A soft x-ray transmission grating spectrometer has been designed for use on high energy-density physics experiments at the National Ignition Facility (NIF); coupled to one of the NIF gated x-ray detectors it records 16 time-gated spectra between 250 and 1000 eV with 100 ps temporal resolution. The trade-off between spectral and spatial resolution leads to an optimized design for measurement of emission around the peak of a 100-300 eV blackbody spectrum. Performance qualification results from the NIF, the Trident Laser Facility and vacuum ultraviolet beamline at the National Synchrotron Light Source, evidence a <100 μm spatial resolution in combination with a source-size limited spectral resolution that is <10 eV at photon energies of 300 eV.
Collapse
|
114
|
Gosling C, Richardson M, Brown G, Hau R, Pirpiris M, Edwards E. TRAUMATIC SUBTROCHANTERIC FRACTURES. CLASSIFICATION, INTERVENTION, COMPLICATIONS AND PATIENT OUTCOMES. Inj Prev 2012. [DOI: 10.1136/injuryprev-2012-040580b.12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
115
|
Andrew N, Wolfe R, Cameron P, Richardson M, Page R, Bucknill A, Gabbe B. The impact of sport and active recreation injuries on physical activity levels at 12 months post-injury. Scand J Med Sci Sports 2012; 24:377-85. [PMID: 22937749 DOI: 10.1111/j.1600-0838.2012.01523.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/27/2012] [Indexed: 01/15/2023]
Abstract
The aim of this study was to evaluate the impact of serious sport and active recreation injury on 12-month physical activity levels. Adults admitted to hospital with sport and active recreation-related injuries, and captured by the Victorian Orthopaedic Trauma Outcomes Registry were recruited to the study. Changes between preinjury and 12 month post-injury physical activity was assessed using the short International Physical Activity Questionnaire (IPAQ). Independent demographic, injury, and hospital variables were assessed for associations with changes in physical activity levels, using multivariate linear regression. A total of 324 patients were recruited, of which 98% were followed up at 12 months. Mean short IPAQ scores decreased from 7650 METS (95% CI: 7180, 8120) preinjury to 3880 METS; (95% CI: 3530, 4250) post-injury, independent of functional recovery. Education level and occupation group were the only variables independently associated with changes in physical activity levels post-injury. These results highlighted that sport and active recreation injuries lead to significant reductions in physical activity levels. Hence, the prevention of sport and active recreation injuries is important when considering promotion of activity at a population level.
Collapse
|
116
|
Richardson M. Designer/Maker: The Rise of Additive Manufacturing, Domestic-Scale Production and the Possible Implications for the Automotive Industry. ACTA ACUST UNITED AC 2012. [DOI: 10.3722/cadaps.2012.pace.33-48] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
117
|
Suranadi IW, Demaison L, Chaté V, Peltier S, Richardson M, Leverve X. An increase in the redox state during reperfusion contributes to the cardioprotective effect of GIK solution. J Appl Physiol (1985) 2012; 113:775-84. [PMID: 22797310 DOI: 10.1152/japplphysiol.01153.2011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
This study aimed at determining whether glucose-insulin-potassium (GIK) solutions modify the NADH/NAD(+) ratio during postischemic reperfusion and whether their cardioprotective effect can be attributed to this change in part through reduction of the mitochondrial reactive oxygen species (ROS) production. The hearts of 72 rats were perfused with a buffer containing glucose (5.5 mM) and hexanoate (0.5 mM). They were maintained in normoxia for 30 min and then subjected to low-flow ischemia (0.5% of the preischemic coronary flow for 20 min) followed by reperfusion (45 min). From the beginning of ischemia, the perfusate was subjected to various changes: enrichment with GIK solution, enrichment with lactate (2 mM), enrichment with pyruvate (2 mM), enrichment with pyruvate (2 mM) plus ethanol (2 mM), or no change for the control group. Left ventricular developed pressure, heart rate, coronary flow, and oxygen consumption were monitored throughout. The lactate/pyruvate ratio of the coronary effluent, known to reflect the cytosolic NADH/NAD(+) ratio and the fructose-6-phosphate/dihydroxyacetone-phosphate (F6P/DHAP) ratio of the reperfused myocardium, were evaluated. Mitochondrial ROS production was also estimated. The GIK solution improved the recovery of mechanical function during reperfusion. This was associated with an enhanced cytosolic NADH/NAD(+) ratio and reduced mitochondrial ROS production. The cardioprotection was also observed when the hearts were perfused with fluids known to increase the cytosolic NADH/NAD(+) ratio (lactate, pyruvate plus ethanol) compared with the other fluids (control and pyruvate groups). The hearts with a high mechanical recovery also displayed a low F6P/DHAP ratio, suggesting that an accelerated glycolysis rate may be responsible for increased cytosolic NADH production. In conclusion, the cardioprotection induced by GIK solutions could occur through an increase in the cytosolic NADH/NAD(+) ratio, leading to a decrease in mitochondrial ROS production.
Collapse
|
118
|
Udovicich C, Richardson M, Cormack J. The effect of continuous interscalene nerve blockade on hospital length of stay following shoulder surgery. BMC Proc 2012. [PMCID: PMC3425995 DOI: 10.1186/1753-6561-6-s4-o31] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
119
|
Vollmar C, O'Muircheartaigh J, Koepp M, Richardson M, Duncan J. Diffusion tensor imaging reveals altered structural connectivity of the mesial frontal lobe in juvenile myoclonic epilepsy. KLIN NEUROPHYSIOL 2012. [DOI: 10.1055/s-0032-1301458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
120
|
Freemantle N, Richardson M, Wood J, Ray D, Khosla S, Shahian D, Roche WR, Stephens I, Keogh B, Pagano D. Weekend hospitalization and additional risk of death: an analysis of inpatient data. J R Soc Med 2012; 105:74-84. [PMID: 22307037 DOI: 10.1258/jrsm.2012.120009] [Citation(s) in RCA: 224] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
OBJECTIVE To assess whether weekend admissions to hospital and/or already being an inpatient on weekend days were associated with any additional mortality risk. DESIGN Retrospective observational survivorship study. We analysed all admissions to the English National Health Service (NHS) during the financial year 2009/10, following up all patients for 30 days after admission and accounting for risk of death associated with diagnosis, co-morbidities, admission history, age, sex, ethnicity, deprivation, seasonality, day of admission and hospital trust, including day of death as a time dependent covariate. The principal analysis was based on time to in-hospital death. PARTICIPANTS National Health Service Hospitals in England. MAIN OUTCOME MEASURES 30 day mortality (in or out of hospital). RESULTS There were 14,217,640 admissions included in the principal analysis, with 187,337 in-hospital deaths reported within 30 days of admission. Admission on weekend days was associated with a considerable increase in risk of subsequent death compared with admission on weekdays, hazard ratio for Sunday versus Wednesday 1.16 (95% CI 1.14 to 1.18; P < .0001), and for Saturday versus Wednesday 1.11 (95% CI 1.09 to 1.13; P < .0001). Hospital stays on weekend days were associated with a lower risk of death than midweek days, hazard ratio for being in hospital on Sunday versus Wednesday 0.92 (95% CI 0.91 to 0.94; P < .0001), and for Saturday versus Wednesday 0.95 (95% CI 0.93 to 0.96; P < .0001). Similar findings were observed on a smaller US data set. CONCLUSIONS Admission at the weekend is associated with increased risk of subsequent death within 30 days of admission. The likelihood of death actually occurring is less on a weekend day than on a mid-week day.
Collapse
|
121
|
Richardson J, Richardson M, Nijjar R. Fistula after pyloroplasty - A novel approach to the management of a leak following oesophagectomy. J Surg Case Rep 2012; 2012:9. [PMID: 24960785 PMCID: PMC3649494 DOI: 10.1093/jscr/2012.2.9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
Management of upper gastrointestinal anastomotic leaks is an inter-disciplinary challenge. We present a case of late pyloroplasty leak following 3-stage oesophagectomy. We describe a novel, combined endoscopic and fluroscopic procedure to introduce a T-tube into the anastomotic leak proving an ideal plug at the site of leak which enabled the patient to consume a normal diet and return home safely.
Collapse
|
122
|
Lamoth F, Cruciani M, Mengoli C, Castagnola E, Lortholary O, Richardson M, Marchetti O. -Glucan Antigenemia Assay for the Diagnosis of Invasive Fungal Infections in Patients With Hematological Malignancies: A Systematic Review and Meta-Analysis of Cohort Studies From the Third European Conference on Infections in Leukemia (ECIL-3). Clin Infect Dis 2011; 54:633-43. [DOI: 10.1093/cid/cir897] [Citation(s) in RCA: 227] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
|
123
|
de Souza A, Lima M, Drewes C, da Silva J, Torres K, Pereira E, de Castro C, Vieira L, Cordeiro M, Richardson M, Gomez R, Romano-Silva M, Ferreira J, Gomez M. Antiallodynic effect and side effects of Phα1β, a neurotoxin from the spider Phoneutria nigriventer: Comparison with ω-conotoxin MVIIA and morphine. Toxicon 2011; 58:626-33. [DOI: 10.1016/j.toxicon.2011.09.008] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2011] [Revised: 09/13/2011] [Accepted: 09/20/2011] [Indexed: 10/17/2022]
|
124
|
Skiada A, Pagano L, Groll A, Zimmerli S, Dupont B, Lagrou K, Lass-Florl C, Bouza E, Klimko N, Gaustad P, Richardson M, Hamal P, Akova M, Meis J, Rodriguez-Tudela JL, Roilides E, Mitrousia-Ziouva A, Petrikkos G. Zygomycosis in Europe: analysis of 230 cases accrued by the registry of the European Confederation of Medical Mycology (ECMM) Working Group on Zygomycosis between 2005 and 2007. Clin Microbiol Infect 2011; 17:1859-67. [DOI: 10.1111/j.1469-0691.2010.03456.x] [Citation(s) in RCA: 470] [Impact Index Per Article: 36.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
|
125
|
Nunes KP, Wynne BM, Cordeiro MN, Borges MH, Richardson M, Leite R, DeLima ME, Webb RC. Increased cavernosal relaxation by Phoneutria nigriventer toxin, PnTx2-6, via activation at NO/cGMP signaling. Int J Impot Res 2011; 24:69-76. [PMID: 21975567 PMCID: PMC3253321 DOI: 10.1038/ijir.2011.47] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Erectile dysfunction mechanisms in diabetic patients are multifactorial and often lead to resistance to current therapy. Animal toxins have been used as pharmacological tools to study penile erection. Human accidents involving the venom of Phoneutria nigriventer spider are characterized by priapism. We hypothesize that PnTx2-6 potentiates cavernosal relaxation in diabetic mice by increasing cGMP. This effect is nNOS dependent. Cavernosal strips were contracted with phenylephrine (10−5 M) and relaxed by electrical field stimulation (EFS, 20V, 1–32 Hz) in the presence or absence of PnTx2-6 (10−8 M).Cavernosal strips from nNOS and eNOS knocaut (KO) mice, besides nNOS inhibitor (10−5M), were used to evaluate the role of this enzyme in the potentiation effect evoked by PnTx2-6. Tissue cGMP levels were determined after stimulation with PnTx2-6 in presence or absence of L-NAME (10−4M) and ω-conotoxin GVIA (10−6M), an N-type calcium channel inhibitor. Results showed PnTx2-6 enhanced cavernosal relaxation in diabetic mice (65%) and eNOS KO mice, but not in nNOS KO mice. The toxin effect in the cavernosal relaxation was abolished by nNOS inhibitor. cGMP levels are increased by PnTx2-6, however L-NAME abolished this enhancement as well as ω-conotoxin GVIA. We conclude PnTx2-6 facilitates penile relaxation in diabetic mice through a mechanism dependent on nNOS, probably via increasing NO/cGMP production.
Collapse
|