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Peters J, Giudici-Orticoni MT, Zaccai G, Guiral M. Dynamics measured by neutron scattering correlates with the organization of bioenergetics complexes in natural membranes from hyperthermophile and mesophile bacteria. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2013; 36:78. [PMID: 23880731 DOI: 10.1140/epje/i2013-13078-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2012] [Revised: 02/01/2013] [Accepted: 02/26/2013] [Indexed: 06/02/2023]
Abstract
Various models on membrane structure and organization of proteins and complexes in natural membranes emerged during the last years. However, the lack of systematic dynamical studies to complement structural investigations hindered the establishment of a more complete picture of these systems. Elastic incoherent neutron scattering gives access to the dynamics on a molecular level and was applied to natural membranes extracted from the hyperthermophile Aquifex aeolicus and the mesophile Wolinella succinogenes bacteria. The results permitted to extract a hierarchy of dynamic flexibility and atomic resilience within the samples, which correlated with the organization of proteins in bioenergetics complexes and the functionality of the membranes.
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Kemna M, Damoiseaux J, Austen J, Winkens B, Peters J, Van Paassen P, Cohen Tervaert J. Longitudinal ANCA measurements for predicting a relapse are useful in patients with severe disease but not in patients with limited disease. Presse Med 2013. [DOI: 10.1016/j.lpm.2013.02.241] [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: 11/24/2022] Open
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Schäfer S, Peters J, von Bohlen und Halbach O. The (pro)renin receptor / ATP6ap2 is expressed in the murine hippocampus by adult and newly generated neurons. Restor Neurol Neurosci 2013; 31:225-31. [DOI: 10.3233/rnn-120282] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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79
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Bergmann L, Großwendt T, Kahlert P, Konorza T, Wendt D, Thielmann M, Heusch G, Peters J, Kottenberg E. Arrhythmogenic risk of pulmonary artery catheterisation in patients with severe aortic stenosis undergoing transcatheter aortic valve implantation. Anaesthesia 2012; 68:46-51. [DOI: 10.1111/anae.12069] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/02/2012] [Indexed: 12/15/2022]
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80
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Bond M, Rogers G, Peters J, Anderson R, Hoyle M, Miners A, Moxham T, Davis S, Thokala P, Wailoo A, Jeffreys M, Hyde C. The effectiveness and cost-effectiveness of donepezil, galantamine, rivastigmine and memantine for the treatment of Alzheimer's disease (review of Technology Appraisal No. 111): a systematic review and economic model. Health Technol Assess 2012; 16:1-470. [PMID: 22541366 DOI: 10.3310/hta16210] [Citation(s) in RCA: 163] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND Alzheimer’s disease (AD) is the most commonly occurring form of dementia. It is predominantly a disease of later life, affecting 5% of those over 65 in the UK. OBJECTIVES Review and update guidance to the NHS in England and Wales on the clinical effectiveness and cost-effectiveness of donepezil, galantamine, rivastigmine [acetylcholinesterase inhibitors (AChEIs)] and memantine within their licensed indications for the treatment of AD, which was issued in November 2006 (amended September 2007 and August 2009). DATA SOURCES Electronic databases were searched for systematic reviews and/or metaanalyses, randomised controlled trials (RCTs) and ongoing research in November 2009 and updated in March 2010; this updated search revealed no new includable studies. The databases searched included The Cochrane Library (2009 Issue 4, Cochrane Database of Systematic Reviews and Cochrane Central Register of Controlled Trials), MEDLINE, MEDLINE In-Process & Other Non-Indexed Citations, EMBASE, PsycINFO, EconLit, ISI Web of Science Databases--Science Citation Index, Conference Proceedings Citation Index, and BIOSIS; the Centre for Reviews and Dissemination (CRD) databases--NHS Economic Evaluation Database, Health Technology Assessment, and Database of Abstracts of Reviews of Effects. REVIEW METHODS The clinical effectiveness systematic review was undertaken following the principles published by the NHS CRD. We included RCTs whose population was people with AD. The intervention and comparators depended on disease severity, measured by the Mini Mental State Examination (MMSE). INTERVENTIONS mild AD (MMSE 21-26)--donepezil, galantamine and rivastigmine; moderate AD (MMSE 10-20)--donepezil, galantamine, rivastigmine and memantine; severe AD (MMSE < 10)--memantine. Comparators: mild AD (MMSE 21-26)--placebo or best supportive care (BSC); moderate AD (MMSE 10-20)--donepezil, galantamine, rivastigmine, memantine, placebo or BSC; severe AD (MMSE < 10)--placebo or BSC. The outcomes were clinical, global, functional, behavioural, quality of life, adverse events, costs and cost-effectiveness. Where appropriate, data were pooled using pair-wise meta-analysis, multiple outcome measures, metaregression and mixedtreatment comparisons. The decision model was based broadly on the structure of the three-state Markov model described in the previous technology assessment report, based upon time to institutionalisation, parameterised with updated estimates of effectiveness, costs and utilities. RESULTS Notwithstanding the uncertainty of our results, we found in the base case that the AChEIs are probably cost saving at a willingness-to-pay (WTP) of £’30,000 per qualityadjusted life-year (QALY) for people with mild-to-moderate AD. For this class of drugs, there is a > 99% probability that the AChEIs are more cost-effective than BSC. These analyses assume that the AChEIs have no effect on survival. For the AChEIs, in people with mild to moderate AD, the probabilistic sensitivity analyses suggested that donepezil is the most cost-effective, with a 28% probability of being the most cost-effective option at a WTP of £’30,000 per QALY (27% at a WTP of £’20,000 per QALY). In the deterministic results, donepezil dominates the other drugs and BSC, which, along with rivastigmine patches, are associated with greater costs and fewer QALYs. Thus, although galantamine has a slightly cheaper total cost than donepezil (£’69,592 vs £’69,624), the slightly greater QALY gains from donepezil (1.616 vs 1.617) are enough for donepezil to dominate galantamine.The probability that memantine is cost-effective in a moderate to severe cohort compared with BSC at a WTP of £’30,000 per QALY is 38% (and 28% at a WTP of £’20,000 per QALY). The deterministic ICER for memantine is £’32,100 per/QALY and the probabilistic ICER is £’36,700 per/QALY. LIMITATIONS Trials were of 6 months maximum follow-up, lacked reporting of key outcomes, provided no subgroup analyses and used insensitive measures. Searches were limited to English language, The model does not include behavioural symptoms and there is uncertainty about the model structure and parameters. CONCLUSIONS The additional clinical effectiveness evidence identified continues to suggest clinical benefit from the AChEIs in alleviating AD symptoms, although there is debate about the magnitude of the effect. Although there is also new evidence on the effectiveness of memantine, it remains less supportive of this drug’s use than the evidence for AChEIs. The conclusions concerning cost-effectiveness are quite different from the previous assessment. This is because both the changes in effectiveness and costs between drug use and non-drug use underlying the ICERs are very small. This leads to highly uncertain results, which are very sensitive to change. RESEARCH PRIORITIES: RCTs to include mortality, time to institutionalisation and quality of life, powered for subgroup analysis. FUNDING The National Institute for Health Research Health Technology Assessment programme.
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Kinne J, Wani NA, Wernery U, Peters J, Knospe C. Is there a two-humped stage in the embryonic development of the dromedary? Anat Histol Embryol 2012; 39:479-80. [PMID: 20608925 DOI: 10.1111/j.1439-0264.2010.01011.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
It has been postulated that the one-humped (Arabian) dromedary and the two-humped (Bactrian) camel originated from a single ancestor. Consequently, the dromedary was considered a breed of the two-humped camel, based on an anatomical study by Lombardini L, 1879: Ann. Del. Universita Toscane, 259, 147, who described a reduced second hump like structure in foetal and adult dromedaries. To resolve this lingering issue, we analysed dromedary foetuses and calves. In contrast to the situation in two-humped camels, we never observed any rudimentary second hump in the dromedary foetuses or calves.
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Richter JE, Pandolfino JE, Vela MF, Kahrilas PJ, Lacy BE, Ganz R, Dengler W, Oelschlager BK, Peters J, DeVault KR, Fass R, Gyawali CP, Conklin J, DeMeester T. Utilization of wireless pH monitoring technologies: a summary of the proceedings from the esophageal diagnostic working group. Dis Esophagus 2012; 26:755-65. [PMID: 22882487 DOI: 10.1111/j.1442-2050.2012.01384.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Gastroesophageal reflux disease (GERD) can be difficult to diagnose - symptoms alone are often not enough, and thus, objective testing is often required. GERD is a manifestation of pathologic levels of reflux into the esophagus of acidic, nonacidic, and/or bilious gastric content. However, in our current evidence-based knowledge approach, we only have reasonable outcome data in regards to acid reflux, as this particular type of refluxate predictably causes symptoms and mucosal damage, which improves with medical or surgical therapy. While there are data suggesting that nonacid reflux may be responsible for ongoing symptoms despite acid suppression in some patients, outcome data about this issue are limited. Therefore, this working group believes that it is essential to confirm the presence of acid reflux in patients with 'refractory' GERD symptoms or extraesophageal symptoms thought to be caused by gastroesophageal reflux before an escalation of antireflux therapy is considered. If patients do not have pathologic acid reflux off antisecretory therapy, they are unlikely to have clinically significant nonacid or bile reflux. Patients who do not have pathologic acid gastroesophageal reflux parameters on ambulatory pH monitoring then: (i) could attempt to discontinue antisecretory medications like proton pump inhibitors and H2-receptor antagonists (which are expensive and which carry risks - i.e. C. diff, etc.); (ii) may undergo further evaluation for other causes of their esophageal symptoms (e.g. functional heartburn or chest pain, eosinophilic esophagitis, gastroparesis, achalasia, other esophageal motor disorders); and (iii) can be referred to an ear, nose, and throat/pulmonary/allergy physician for assessment of non-GERD causes of their extraesophageal symptoms.
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Reitter A, Peters J, Wittekindt B, Buxmann H, Geka F, Rolle U, Schlösser R, Louwen F. Prenatal management of diaphragmatic rhabdomyosarcoma presenting with fetal hydrops. ULTRASOUND IN OBSTETRICS & GYNECOLOGY : THE OFFICIAL JOURNAL OF THE INTERNATIONAL SOCIETY OF ULTRASOUND IN OBSTETRICS AND GYNECOLOGY 2012; 40:235-237. [PMID: 21997954 DOI: 10.1002/uog.10113] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 09/14/2011] [Indexed: 05/31/2023]
Abstract
Fetal malignant tumors are rare. We present a case of intrauterine diagnosis of a diaphragmatic tumor presenting with fetal hydrops at 32 weeks' gestation. The sonographic findings were bilateral pleural effusion, ascites and skin edema. A large right-sided diaphragmatic tumor was identified. Owing to the findings on ultrasound and magnetic resonance imaging a solid malignant tumor was suspected. The pleural effusions were drained and malignant cells identified. Because of rapid tumor progression Cesarean section was performed and a hydropic female newborn was delivered at 34 + 0 weeks' gestation. There was no sign of metastatic disease. Postnatally tumor biopsy revealed an alveolar rhabdomyosarcoma. Therapy included chemotherapy and secondary surgical intervention. After a good primary response with complete remission after 6 months, the rhabdomyosarcoma relapsed at 12 months with cerebral metastasis. The prognosis was poor.
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Peters J, Sahin M, Vogel-Farley V, Jeste S, Nelson C, Gregas M, Prabhu S, Scherrer B, Warfield S. Loss of White Matter Microstructural Integrity Is Associated with Adverse Neurological Outcome in Tuberous Sclerosis Complex (S28.003). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.s28.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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85
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Tomas-Fernandez M, Loddenkemper T, Van Putten M, Peters J. Behavioral Measures and EEG Monitoring Using the Brain Symmetry Index during the Wada-Test in Children (P04.029). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.p04.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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86
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Brassen S, Gamer M, Peters J, Gluth S, Buchel C. Don't Look Back in Anger! Responsiveness to Missed Chances in Successful and Nonsuccessful Aging. Science 2012; 336:612-4. [DOI: 10.1126/science.1217516] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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87
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Brendt P, Rehfeld I, Kamphausen A, Kreissig C, Peters J. Lipopolysaccharide interference in erythropoiesis in mice. Anaesthesia 2012; 67:493-500. [PMID: 22352462 DOI: 10.1111/j.1365-2044.2011.07001.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Anaemia is a common problem in septic patients. We tested whether lipopolysaccharide suppressed erythropoiesis and interfered with erythropoietin. Male mice (strain C57BL/6, n = 76) were injected Escherichia coli lipopolysaccharide (serotype O127:B8; 20 mg.kg(-1) intraperitoneally) or vehicle, followed by either erythropoietin (5000 IU.kg(-1) intraperitoneally) or vehicle, and killed after 24 or 72 h. Femur bone marrow cells were stained for Ter-119, CD71 and C-Kit antigen using specific flow cytometry gates for proerythroblasts, basophilic, polychromatic and orthochromatic erythroblasts, and peripheral blood reticulocytes were counted. Erythropoietin stimulated erythropoiesis, as evidenced by increased reticulocytes after 72 h by 197% and proerythroblasts by 50% (p < 0.05). Lipopolysaccharide alone decreased proerythroblasts by 53% and basophilic erythroblasts by 75% (p < 0.05). Orthochromatic erythroblasts doubled after lipopolysaccharide exposure (p < 0.05) without any increase in reticulocytes. Lipopolysaccharide completely suppressed erythropoietin's stimulatory effects and evoked a maturation block at the late stage of erythropoiesis. Lipopolysaccharide could cause anaemia in sepsis.
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Hopf-Jensen S, Buchalla R, Rubarth O, Peters J, Dunker H, Hensler HM, Müller-Hülsbeck S, Börm W. Unusual spinal metastases from an adenoid cystic carcinoma of the maxillary sinus. J Clin Neurosci 2012; 19:772-4. [PMID: 22321367 DOI: 10.1016/j.jocn.2011.07.047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2011] [Revised: 07/03/2011] [Accepted: 07/06/2011] [Indexed: 11/17/2022]
Abstract
Adenoid cystic carcinoma (ACC), the second most common cancer occurring in the sinonasal tract, is an aggressive malignancy with a poor five-year survival rate. Spinal metastases to the vertebral column related to this cancer are rare. This report presents a patient with maxillary sinus carcinoma with vertebral metastases at the thoracic level and compression of the spinal cord seven years after surgical resection of the primary tumor. Eleven years after detection of the primary tumor the patient is still able to walk. The role of decompression and/or fusion in spinal metastases with neurologic deficits is still under debate, although recent studies have confirmed the beneficial role of surgical intervention in selected patients. This report represents an example of modern individual treatment of an aggressive tumor in a palliative situation. The epidemiology, clinical findings, treatment and outcome of this atypical distant metastasis in long-term survivors are presented.
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Frey U, Kottenberg E, Kamler M, Leineweber K, Manthey I, Heusch G, Siffert W, Peters J. Genetic interactions in the β-adrenoceptor/G-protein signal transduction pathway and survival after coronary artery bypass grafting: a pilot study. Br J Anaesth 2011; 107:869-878. [DOI: 10.1093/bja/aer302] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023] Open
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90
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Reinhard J, Heinrich TM, Reichenbach L, Peiffer S, Peters J, Louwen F. Prevalence, spectrum and sensitivity of bacterial and fungal infection at 21st to 33rd weeks gestational age with preterm rupture of membrane – 5 years of experience in 1 perinatal centre. Z Geburtshilfe Neonatol 2011. [DOI: 10.1055/s-0031-1293354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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91
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Fangmeier T, Lichtblau A, Peters J, Biscaldi-Schäfer M, Ebert D, van Elst LT. [Psychotherapy of Asperger syndrome in adults]. DER NERVENARZT 2011; 82:628-35. [PMID: 20857273 DOI: 10.1007/s00115-010-3121-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
There is an increase in awareness in professionals that the Asperger syndrome (AS) in adulthood is associated with specific problems and burdens which may well differ from those in childhood and adolescence. The core symptoms of AS generally persist into adulthood, however in contrast to childhood and adolescence there is no specific support system for adults in Germany. Also the environment of the afflicted patient changes thus producing different challenges and problems. In addition a subgroup of patients with high functioning AS primarily presents in adulthood generally due to secondary psychosocial problems, depression or anxiety. Difficulties in social interaction, problems with modified daily routines and unforeseen situations cause severe frustration for the majority of the patients. While several therapy programs have been developed and implemented for children and adolescents, for adults there are none. Also there is a lack of comprehensive concepts addressing the specific needs of adult patients with AS. From an economic perspective this is particularly unfortunate since affected people often have good or excellent partial abilities and might be very valuable employees. In this article existing therapeutic concepts for AS are summarized and a newly designed group therapy program for adult patients with Asperger syndrome in Freiburg is introduced (Freiburg Asperger-spezifische Therapie für Erwachsene, FASTER) which specifically addresses the needs and problems of adult patients with AS.
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Peters J, Steuer K, Louwen F. Schwangerschaftsinduzierte antierythrozytäre Autoimmunerkrankung bei wärmewirksamen Autoantikörpern mit partieller f-Spezifität. Z Geburtshilfe Neonatol 2011. [DOI: 10.1055/s-0031-1293378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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93
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Stanford K, Bryan M, Peters J, González LA, Stephens TP, Schwartzkopf-Genswein KS. Effects of long- or short-haul transportation of slaughter heifers and cattle liner microclimate on hide contamination with Escherichia coli O157. J Food Prot 2011; 74:1605-10. [PMID: 22004805 DOI: 10.4315/0362-028x.jfp-11-154] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Effects of cattle transportation on hide contamination with Escherichia coli O157 have been variable, and the present study was designed to clarify relationships among duration of transport, microclimate, and environment within the trailer and contamination of hides with E. coli O157. Crossbred Angus heifers from a feedlot in southern Alberta were sorted into 10 replicate loads containing 45 animals (short haul, 621.5 ± 2.1 kg of body weight) or 46 animals (long haul, 576.0 ± 1.7 kg of body weight). Long-haul trips (n = 5) were made in July and August to slaughter plant A, whereas short-haul trips (n = 5) were made in October to slaughter plant B. The same trailer unit and driver were used for all loads. Data loggers were located in the ceiling of each compartment of the trailers to record ambient temperature and relative humidity. Each heifer was swabbed on the perineum on-farm prior to loading and immediately after stunning at the slaughter plant (an average 12-h transport for long haul and 1-h transport for short haul). Swabs were transported on ice before immunomagnetic separation for detection of E. coli O157. Transportation did not affect prevalence of hide contamination with E. coli O157, although 80% of long-haul swabs were positive on-farm compared with 26% of short-haul swabs, due to seasonality of shedding E. coli O157. Cattle transported in the nose compartment had fewer positive hide swabs (P < 0.05) than cattle in the deck or belly compartments during long-haul trips, even though the nose had a higher (P < 0.05) temperature-humidity index than the other compartments. Prevalence of hide contamination varied widely among loads even when the organism was at seasonally low levels. This suggests that the feedlot pen has a greater effect on hide contamination at the slaughter plant than transportation factors including temperature-humidity index, loading density, and duration of transport.
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Bergmann L, Kahlert P, Eggebrecht H, Frey U, Peters J, Kottenberg E. Transfemoral aortic valve implantation under sedation and monitored anaesthetic care - a feasibility study. Anaesthesia 2011; 66:977-82. [DOI: 10.1111/j.1365-2044.2011.06788.x] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Baker M, Thornley C, Mills C, Roberts S, Perera S, Peters J, Kelso A, Barr I, Wilson N. P1-388 Transmission of pandemic influenza a (H1N1) on a passenger aircraft. JOURNAL OF EPIDEMIOLOGY & COMMUNITY HEALTH 2011. [DOI: 10.1136/jech.2011.142976f.79] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Heubner M, Wimberger P, Dahlmann B, Kasimir-Bauer S, Kimmig R, Peters J, Wohlschläger J, Sixt SU. Der prognostische Einfluss von zirkulierendem Proteasom bei Ovarialkarzinompatientinnen. Geburtshilfe Frauenheilkd 2011. [DOI: 10.1055/s-0031-1286482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
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Hu Y, Bandla S, Godfrey TE, Tan D, Luketich JD, Pennathur A, Qiu X, Hicks DG, Peters J, Zhou Z. HER2 amplification, overexpression and score criteria in esophageal adenocarcinoma. Mod Pathol 2011; 24:899-907. [PMID: 21460800 PMCID: PMC3138485 DOI: 10.1038/modpathol.2011.47] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The HER2 oncogene was recently reported to be amplified and overexpressed in esophageal adenocarcinoma. However, the relationship of HER2 amplification in esophageal adenocarcinoma with prognosis has not been well defined. The scoring systems for clinically evaluating HER2 in esophageal adenocarcinoma are not established. The aims of the study were to establish a HER2 scoring system and comprehensively investigate HER2 amplification and overexpression in esophageal adenocarcinoma and its precursor lesion. Using a tissue microarray, containing 116 cases of esophageal adenocarcinoma, 34 cases of Barrett's esophagus, 18 cases of low-grade dysplasia and 15 cases of high-grade dysplasia, HER2 amplification and overexpression were analyzed by HercepTest and chromogenic in situ hybridization methods. The amplification frequency in an independent series of 116 esophageal adenocarcinoma samples was also analyzed using Affymetrix SNP 6.0 microarrays. In our studies, we have found that HER2 amplification does not associate with poor prognosis in total 232 esophageal adenocarcinoma patients by chromogenic in situ hybridization and high-density microarrays. We further confirm the similar frequency of HER2 amplification by chromogenic in situ hybridization (18%; 21 out of 116) and SNP 6.0 microarrays (16%, 19 out of 116) in esophageal adenocarcinoma. HER2 protein overexpression was observed in 12% (14 out of 116) of esophageal adenocarcinoma and 7% (1 out of 15) of high-grade dysplasia. No HER2 amplification or overexpression was identified in Barrett's esophagus or low-grade dysplasia. All HER2 protein overexpression cases showed HER2 gene amplification. Gene amplification was found to be more frequent by chromogenic in situ hybridization than protein overexpression in esophageal adenocarcinoma (18 vs 12%). A modified two-step model for esophageal adenocarcinoma HER2 testing is recommended for clinical esophageal adenocarcinoma HER2 trial.
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Reveiller M, Ghatak S, Kalatskaya I, Toia L, DSouza M, Zhou Z, Bandla S, Godfrey TE, Peters J. Abstract 2179: Bile acids downregulate the squamous differentiation program of esophageal cells. Cancer Res 2011. [DOI: 10.1158/1538-7445.am2011-2179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background: The lumen of the normal esophagus is covered by a nonkeratinized, stratified squamous epithelium. However, in individuals with prolonged gastroesophageal reflux disease the squamous epithelium is gradually replaced by a more acid-resistant metaplastic columnar epithelium known as Barrett's Esophagus (BE). BE is the strongest known risk factor for development of esophageal adenocarcinoma. Understanding the molecular mechanisms underlying the formation of BE is fundamental to the development of new and effective prevention and treatment strategies for patients with BE.
Methods: We performed a global analysis of gene expression in normal squamous esophageal cells in response to bile acids or acid exposure. Differentially expressed genes were classified into major biological functions based on analysis using pathway and interaction network software programs. Array data were verified by quantitative PCR and western blot both in-vitro and in human biopsies from esophageal normal squamous and columnar epithelia.
Results: Bile acids modulated expression of 218 genes (153 up and 65 down) and acid 112 genes (31 up and 81 down). Interestingly, genes involved in squamous differentiation formed the largest functional group of differentially expressed genes and consisted of 40 genes downregulated by bile acids exposure. Bile acids decreased expression of key squamous differentiation genes such as KRT10, KRTDAP and GRHL1 which was confirmed at both the mRNA and protein level as was increased expression of CDX2, a transcription factor key to the intestinal epithelial phenotype. Bile acids induced expression changes were also seen in genes involved in the pathways of cell adhesion, DNA repair, oxidative stress, cell cycle, Wnt signaling and lipid metabolism. Expression of DSG1, a target gene of GRHL1, and DKK1, a Wnt inhibitor, were confirmed to be respectively downregulated and upregulated by bile acids. Further, expression data from human columnar epithelial biopsies revealed low or no expression of KRT10, KRTDAP, DSG1 and GRHL1 compared to squamous epithelia. Finally, network analysis suggested that bile acids exposure modulated the transcription activity of CREB and bile acids induced phosphorylation of CREB was confirmed experimentally.
Conclusion: We report for the first time that bile acids inhibit the squamous differentiation program of esophageal cells while inducing columnar differentiation via CDX2 expression possibly via CREB and Wnt signaling.
Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 102nd Annual Meeting of the American Association for Cancer Research; 2011 Apr 2-6; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2011;71(8 Suppl):Abstract nr 2179. doi:10.1158/1538-7445.AM2011-2179
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Peters J, De Baets B, Van Doninck J, Calvete C, Lucientes J, De Clercq EM, Ducheyne E, Verhoest NEC. Absence reduction in entomological surveillance data to improve niche-based distribution models for Culicoides imicola. Prev Vet Med 2011; 100:15-28. [PMID: 21496932 DOI: 10.1016/j.prevetmed.2011.03.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2010] [Revised: 03/10/2011] [Accepted: 03/10/2011] [Indexed: 11/15/2022]
Abstract
Data-driven models for the prediction of bluetongue vector distributions are valuable tools for the identification of areas at risk for bluetongue outbreaks. Various models have been developed during the last decade, and the majority of them use linear discriminant analysis or logistic regression to infer vector-environment relationships. This study presents a performance assessment of two established models compared to a distribution model based on a promising ensemble learning technique called Random Forests. Additionally, the impact of false absences, i.e. data records of suitable vector habitat that are, for various reasons, incorrectly labelled as absent, on the model outcome was assessed using alternative calibration-validation schemes. Three reduction methods were applied to reduce the number of false absences in the calibration data, without loss of information on the environmental gradient of suitable vector habitat: random reduction and stratified reduction based on the distance between absence and presence records in geographical (Euclidean distance) or environmental space (Mahalanobis distance). The results indicated that the predicted vector distribution by the Random Forest model was significantly more accurate than the vector distributions predicted by the two established models (McNemar test, p<0.01) when the calibration data were not reduced with respect to false absences. The performance of the established models, however, increased considerably by application of stratified false absence reductions. Model validation revealed no significant difference between the performance of the three distinct Culicoides imicola distribution models for the majority of alternative stratified reduction schemes. The main conclusion of this study is that the application of Random Forests, or linear discriminant analysis and logistic regression on the condition that calibration data were first reduced on geographical or environmental information, potentially lead toward better vector distribution models.
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Gomez-Rodriguez M, Peters J, Hill J, Schölkopf B, Gharabaghi A, Grosse-Wentrup M. Closing the sensorimotor loop: haptic feedback facilitates decoding of motor imagery. J Neural Eng 2011; 8:036005. [PMID: 21474878 DOI: 10.1088/1741-2560/8/3/036005] [Citation(s) in RCA: 138] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The combination of brain-computer interfaces (BCIs) with robot-assisted physical therapy constitutes a promising approach to neurorehabilitation of patients with severe hemiparetic syndromes caused by cerebrovascular brain damage (e.g. stroke) and other neurological conditions. In such a scenario, a key aspect is how to reestablish the disrupted sensorimotor feedback loop. However, to date it is an open question how artificially closing the sensorimotor feedback loop influences the decoding performance of a BCI. In this paper, we answer this issue by studying six healthy subjects and two stroke patients. We present empirical evidence that haptic feedback, provided by a seven degrees of freedom robotic arm, facilitates online decoding of arm movement intention. The results support the feasibility of future rehabilitative treatments based on the combination of robot-assisted physical therapy with BCIs.
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