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Klenofsky B, Youn C, Walters H, Navis A, Boniece I. An interesting PRESentation of NMO. Mult Scler Relat Disord 2018; 25:163-164. [DOI: 10.1016/j.msard.2018.07.042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Revised: 07/24/2018] [Accepted: 07/25/2018] [Indexed: 11/24/2022]
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Bacon H, Vancia V, Walters H, Waran N. Canine trap-neuter-return: a critical review of potential welfare issues. Anim Welf 2017. [DOI: 10.7120/09627286.26.3.281] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Lees H, Walters H, Cox LS. Animal and human models to understand ageing. Maturitas 2016; 93:18-27. [PMID: 27372369 DOI: 10.1016/j.maturitas.2016.06.008] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Revised: 06/07/2016] [Accepted: 06/08/2016] [Indexed: 12/12/2022]
Abstract
Human ageing is the gradual decline in organ and tissue function with increasing chronological time, leading eventually to loss of function and death. To study the processes involved over research-relevant timescales requires the use of accessible model systems that share significant similarities with humans. In this review, we assess the usefulness of various models, including unicellular yeasts, invertebrate worms and flies, mice and primates including humans, and highlight the benefits and possible drawbacks of each model system in its ability to illuminate human ageing mechanisms. We describe the strong evolutionary conservation of molecular pathways that govern cell responses to extracellular and intracellular signals and which are strongly implicated in ageing. Such pathways centre around insulin-like growth factor signalling and integration of stress and nutritional signals through mTOR kinase. The process of cellular senescence is evaluated as a possible underlying cause for many of the frailties and diseases of human ageing. Also considered is ageing arising from systemic changes that cannot be modelled in lower organisms and instead require studies either in small mammals or in primates. We also touch briefly on novel therapeutic options arising from a better understanding of the biology of ageing.
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Pieniazek J, Williams M, Latham R, Walters H, Wickersham T, Levine R, Lebrun J, Caldwell D, Lee J. Evaluation of an Algal Beta-1,3-Glucan on Broiler Growth Performance and Immune Response. ACTA ACUST UNITED AC 2016. [DOI: 10.3923/ijps.2016.201.210] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Cochrane B, Quinn S, Walters H, Young I. Investigating the adverse respiratory effects of beta-blocker treatment: six years of prospective longitudinal data in a cohort with cardiac disease. Intern Med J 2012; 42:786-93. [DOI: 10.1111/j.1445-5994.2011.02563.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Ward C, Rydell-Tormanen K, Westergren-Thorsson G, Eriksson LT, Walters H. Infection and remodelling: a 21st century model of bronchiectasis? Eur Respir J 2011; 38:758-60. [DOI: 10.1183/09031936.00072811] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Barnum CJ, Bhide N, Lindenbach D, Surrena MA, Goldenberg AA, Tignor S, Klioueva A, Walters H, Bishop C. Effects of noradrenergic denervation on L-DOPA-induced dyskinesia and its treatment by α- and β-adrenergic receptor antagonists in hemiparkinsonian rats. Pharmacol Biochem Behav 2011; 100:607-15. [PMID: 21978941 DOI: 10.1016/j.pbb.2011.09.009] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2011] [Revised: 09/12/2011] [Accepted: 09/17/2011] [Indexed: 11/17/2022]
Abstract
While L-3,4-dihydroxyphenylalanine (L-DOPA) remains the standard treatment for Parkinson's disease (PD), long-term efficacy is often compromised by L-DOPA-induced dyskinesia (LID). Recent research suggests that targeting the noradrenergic (NE) system may provide relief from both PD and LID, however, most PD patients exhibit NE loss which may modify response to such strategies. Therefore this investigation aimed to characterize the development and expression of LID and the anti-dyskinetic potential of the α2- and β-adrenergic receptor antagonists idazoxan and propranolol, respectively, in rats receiving 6-OHDA lesions with (DA lesion) or without desipramaine protection (DA+NE lesion). Male Sprague-Dawley rats (N=110) received unilateral 6-hydroxydopamine lesions. Fifty-three rats received desipramine to protect NE neurons (DA lesion) and 57 received no desipramine reducing striatal and hippocampal NE content 64% and 86% respectively. In experiment 1, the development and expression of L-DOPA-induced abnormal involuntary movements (AIMs) and rotations were examined. L-DOPA efficacy using the forepaw adjusting steps (FAS) test was also assessed in DA- and DA+NE-lesioned rats. In experiment 2, DA- and DA+NE-lesioned rats received pre-treatments of idazoxan or propranolol followed by L-DOPA after which the effects of these adrenergic compounds were observed. Results demonstrated that moderate NE loss reduced the development and expression of AIMs and rotations but not L-DOPA efficacy while anti-dyskinetic efficacy of α2- and β-adrenergic receptor blockade was maintained. These findings suggest that the NE system modulates LID and support the continued investigation of adrenergic compounds for the improved treatment of PD.
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Ostock CY, Dupre KB, Jaunarajs KLE, Walters H, George J, Krolewski D, Walker PD, Bishop C. Role of the primary motor cortex in L-Dopa-induced dyskinesia and its modulation by 5-HT1A receptor stimulation. Neuropharmacology 2011; 61:753-60. [PMID: 21635907 DOI: 10.1016/j.neuropharm.2011.05.021] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2010] [Revised: 04/12/2011] [Accepted: 05/13/2011] [Indexed: 02/02/2023]
Abstract
While serotonin 5-HT1A receptor (5-HT1AR) agonists reduce L-DOPA-induced dyskinesias (LID) by normalizing activity in the basal ganglia neurocircuitry, recent evidence suggests putative 5-HT1AR within the primary motor cortex (M1) may also contribute. To better characterize this possible mechanism, c-fos immunohistochemistry was first used to determine the effects of systemic administration of the full 5-HT1AR agonist ±8-OH-DPAT on L-Dopa-induced immediate early gene expression within M1 and the prefrontal cortex (PFC) of rats with unilateral medial forebrain bundle (MFB) dopamine (DA) lesions. Next, in order to determine if direct stimulation of 5-HT1AR within M1 attenuates the onset of LID, rats with MFB lesions were tested for L-Dopa-induced abnormal involuntary movements (AIMs) and rotations following M1 microinfusions of ±8-OH-DPAT with or without coadministration of the 5-HT1AR antagonist WAY100635. Finally, ±8-OH-DPAT was infused into M1 at peak dyskinesia to determine if 5-HT1AR stimulation attenuates established L-Dopa-induced AIMs and rotations. While no treatment effects were seen within the PFC, systemic ±8-OH-DPAT suppressed L-Dopa-induced c-fos within M1. Intra-M1 5-HT1AR stimulation diminished the onset of AIMs and this effect was reversed by WAY100635 indicating receptor specific effects. Finally, continuous infusion of ±8-OH-DPAT into M1 at peak dyskinesia alleviated L-Dopa-induced AIMs. Collectively, these findings support an integral role for M1 in LID and its modulation by local 5-HT1AR.
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Minodier P, Noël G, Salles M, Retornaz K, Walters H, Combes JC, Garnier JM. [Mefloquine versus halofantrine in children suffering from acute uncomplicated falciparum malaria]. Arch Pediatr 2005; 12 Suppl 1:S67-71. [PMID: 15893244 DOI: 10.1016/s0929-693x(05)80017-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
AIM OF THE STUDY To evaluate mefloquine versus halofantrine in children suffering from acute uncomplicated falciparum malaria. MATERIAL AND METHODS Prospective non randomized study in hospitalized children during one year. Acute falciparum malaria was defined by fever and a positive thin and/or thick smear. Malaria was presumed to have been contracted in Comoros archipelago and/or Madagascar 6 months previously. Patients were excluded, when quinine had to be used, according to World Health Organization's severity criteria. RESULTS Forty-nine children were included: 29 were treated with halofantrine and 20 with mefloquine. Patients features in the two groups of treatment were identical, with exception for the mean time between first clinical signs and diagnosis (shorter in mefloquine group). Fever's and hospitalization's duration under treatment were similar. An increase in QTc interval was frequently observed in patients treated with halofantrine (56 versus 0%), although patients with mefloquine experienced vomiting (45 versus 0%). Relapses seemed to be more frequent with halofantrine (14 versus 0%). DISCUSSION Halofantrine and mefloquine are efficient for falciparum malaria treatment in our pediatric series, despite a high rate of adverse events. Mefloquine's tolerance may probably be improved with changes in regimen and dose. Relapses are more frequent with a single first treatment of halofantrine, than with mefloquine. Unfortunately, features of a second halofantrine treatment are not defined.
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Zheng L, Al Kerithy M, Orsida B, Walters H, Williams T, Hamid Q, Kotsimbos T, Snell G. Differential expression of the novel immuno-regulatory growth factors IL-11 and IL-17 in lung transplant recipients. J Heart Lung Transplant 2003. [DOI: 10.1016/s1053-2498(02)00753-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Heussel CP, Mart-Bonmati L, L'Hermine C, Schmutz G, Chevallier P, Ollif J, Walters H, Heindel W, Koehler K, Matos C, van Beers B, Loose R, Lenz M, Meurer K, Kauczor HU. Gadodiamide and gadopentetate dimeglumine in MRI versus spiral CT in the diagnosis of liver lesions. Acad Radiol 2002; 9 Suppl 2:S463-5. [PMID: 12188309 DOI: 10.1016/s1076-6332(03)80264-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Abstract
BACKGROUND Oral corticosteroids are used as a treatment for asthma, however they are often associated with serious side effects. Dapsone is a sulfone with anti-inflammatory properties, therefore it may have a beneficial effect in the treatment of asthma and act as a corticosteroid-sparing agent. OBJECTIVES The objective of this review is to assess the safety and efficacy of adding dapsone to oral corticosteroids in adults with stable asthma who are dependent on oral corticosteroids with the intention of eventually minimizing or eliminating the use of these steroids. SEARCH STRATEGY The Cochrane Airways group trials register and reference lists of potential articles were searched. SELECTION CRITERIA Randomised controlled trials investigating the addition of dapsone compared to placebo in stable corticosteroid dependent asthmatics. DATA COLLECTION AND ANALYSIS No trials were found that met the selection criteria. MAIN RESULTS No meta-analyses could be performed. REVIEWER'S CONCLUSIONS No randomised controlled trials have been published, so there is no reliable evidence to show whether dapsone is beneficial or otherwise in the management of steroid-dependent asthmatic patients. There is a need for well designed randomised controlled trials to be performed. These must be carried out double-blind, since oral corticosteroid reduction requires a judgement on the part of the physician, who may be open to bias if the treatment allocation is known.
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Reid D, Snell G, Ward C, Krishnaswamy R, Ward R, Zheng L, Williams T, Walters H. Iron overload and nitric oxide-derived oxidative stress following lung transplantation. J Heart Lung Transplant 2001; 20:840-9. [PMID: 11502406 DOI: 10.1016/s1053-2498(01)00282-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Reactive oxygen species (ROS) may contribute to airway injury and the development of the bronchiolitis obliterans syndrome (BOS) following lung transplantation (LT). Chemically active iron released from ferritin stores and nitric oxide (NO)-derived radicals may add to the oxidative burden. METHODS We determined the concentrations of ferritin and the aqueous NO derivative nitrite (NO2(-)) within bronchoalveolar lavage fluid (BALF) of 14 stable LT recipients (ST) and 7 subjects with BOS and 21 normal controls. We also assessed the relationship between BALF ferritin and hemosiderin-laden macrophages (HLMs) using a hemosiderin score (HS) and determined BALF albumin concentration as a marker of microvascular leakage. RESULTS BALF ferritin concentrations and HSs were significantly elevated in LT recipients overall compared with normal controls (p < 0.05). BALF NO2(-) levels were elevated in BOS subjects and STs compared with normal controls (p = 0.002 and p = 0.09, respectively), but there was no difference between transplant groups. BALF albumin concentrations were elevated in BOS patients compared with normal controls (p = 0.02) and ST (p = 0.05), but there was no difference between STs and controls. There was a significant relationship between BALF ferritin concentration and HS in LT recipients overall (r(s) = 0.7, p < 0.001). In BOS subjects, but not ST, BALF ferritin was significantly related to BALF albumin (r(s) = 0.8, p = 0.05) and there was a weak relationship with NO2(-) concentration (r(s) = 0.6, p = 0.1). BALF NO2(-) was strongly related to BALF % neutrophils in BOS subjects (r(s) = 0.9, p < 0.01), but there was no such relationship in STs. CONCLUSIONS Our findings suggest that the allograft could be subject to significant iron-generated oxidative stress, which may be exacerbated by NO and neutrophil-derived ROS, particularly in BOS. Microvascular leakage may be a feature of established chronic rejection, which potentiates the iron overload and contributes to further airway damage and remodeling.
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Reid DW, Walters H. Inhaled triamcinolone and chronic obstructive pulmonary disease. N Engl J Med 2001; 344:1554; author reply 1554-6. [PMID: 11368047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
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Amir-Ansari B, Negus S, Cairns H, Walters H. Beware backache in chronic dialysis patients. Nephrol Dial Transplant 2000; 15:729-30. [PMID: 10809823 DOI: 10.1093/ndt/15.5.729] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Allen RM, Abdulwadud OA, Jones MP, Abramson M, Walters H. A reliable and valid asthma general knowledge questionnaire useful in the training of asthma educators. PATIENT EDUCATION AND COUNSELING 2000; 39:237-242. [PMID: 11040723 DOI: 10.1016/s0738-3991(99)00051-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Using the responses of 115 adults attending an asthma educator training course, the Asthma General Knowledge Questionnaire for Adults (AGKQA) was found to be an acceptably valid and reliable measure for assessing knowledge related to the management of asthma by adults. Content and face validity: expert assessors considered the AGKQA to be a relevant and plausible test of the asthma general knowledge content of the programme. Criterion-related validity: the pretraining scores of educators were significantly higher (P < 0.001) than those of adults with no experience of asthma; total scores for the AGKQA and an asthma knowledge questionnaire developed for parents of children with asthma correlated strongly, 0.72. Test-retest reproducibility: the Spearman rank correlation for the test-retest score was 0.72 (P < 0.02), kappas for concordance of item responses were moderate to very good for two thirds of the items. Internal consistency for the total scale was also acceptable, KR20 0.66.
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Sriprasad S, Mulvin D, Walters H, Coptcoat MJ. Management of renal angiomyolipoma: a report of 53 cases. BJU Int 1999; 84:543-4. [PMID: 10576953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
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Al-Hamali S, Baskerville P, Fraser S, Walters H, Markus HS. Detection of distal emboli in patients with peripheral arterial stenosis before and after iliac angioplasty: a prospective study. J Vasc Surg 1999; 29:345-51. [PMID: 9950992 DOI: 10.1016/s0741-5214(99)70387-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PURPOSE Embolism is believed to be the major cause of end-organ damage after angioplasty and endoluminal procedures. Recently, Doppler ultrasound scanning has been used to detect asymptomatic cerebral emboli. We determined whether asymptomatic embolic signals (ES) could be detected distal to a significant iliac artery stenosis of >60% both before and soon after iliac percutaneous transluminal angioplasty (PTA). METHODS A 2-MHz Doppler scan probe was used to monitor for ES in the common femoral artery before and after 10 successful iliac artery PTAs and at various standardized times in the following 24 hours. The same protocol was used to study 10 patients in the control group after renal PTA. In addition, a single recording was performed in a second nonoperative control group of 10 patients who had no evidence of peripheral vascular disease. The Doppler scan signals were recorded on tape for a later blinded analysis. RESULTS In the 24 hours before iliac PTA, asymptomatic ES were detected in four of 10 patients during a 1-hour recording but in no controls (P =.025). After iliac PTA, ES were detected at 30 minutes in nine of 10 iliac subjects but in only one of 10 renal subjects (P =.0003) and at 2 hours in eight of 10 iliac subjects but in only one of 10 renal subjects (P =.001). The occurrence of ES became less frequent, and ES were present at a lower frequency in eight of 10 iliac PTA subjects at 4 hours and in five of 10 at 24 hours but in no renal PTA subjects at these time points. CONCLUSIONS ES can be detected in the common femoral artery with Doppler ultrasound scanning in patients with iliac artery stenosis both before and soon after iliac PTA despite preangioplasty aspirin and intra-angioplasty heparin therapies. The occurrences of ES were particularly frequent in the 2 hours after PTA. This technique can be used further to study factors that control plaque stability and to evaluate the effect of therapeutic interventions.
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Woods R, Abramson M, Raven M, Bailey M, Weiner M, Walters H. Reply. Eur Respir J 1999. [DOI: 10.1034/j.1399-3003.1999.13a43-1.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Wabnitz PA, Walters H, Tyler MJ, Wallace JC, Bowie JH. First record of host defence peptides in tadpoles. The magnificent tree frog Litoria splendida. THE JOURNAL OF PEPTIDE RESEARCH : OFFICIAL JOURNAL OF THE AMERICAN PEPTIDE SOCIETY 1998; 52:477-81. [PMID: 9924992 DOI: 10.1111/j.1399-3011.1998.tb01252.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Tadpoles of the Magnificent Tree Frog Litoria splendida produce host defence peptides early in their development and well before metamorphosis. Peptides were identified and characterized using high performance liquid chromatography and electrospray mass spectrometry. No host defence peptides were identified in the eggs. The neuropeptide caerulein was detected 10 d after egg deposition, and the antibiotic peptides caerin 1.1, caerin 1.6 and caerin 3.1 first appeared at 14 d. The concentration of peptides increases with the onset of metamorphosis at 84 d, when the host-defence peptide profile is the same as that of the adult.
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Karpawich PP, Walters H, Hakimi M. Chronic performance of a transvenous steroid pacing lead used as an epi-intramyocardial electrode. Pacing Clin Electrophysiol 1998; 21:1486-8. [PMID: 9670197 DOI: 10.1111/j.1540-8159.1998.tb00224.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Excessive surface fibrosis or fat limits effective electrode insertion in patients requiring epicardial pacing. We present chronic performance of a modified transvenous steroid lead used as an epi-intramyocardial electrode in a patient following repair of a univentricular heart after failure of both standard and steroid-eluting epicardial leads. Low implant threshold values remained stable during a 3-year postimplant interval demonstrating an effective and innovative approach to epicardial pacing.
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Walters H. Antibiotic prophylaxis in dental surgery. DENTAL UPDATE 1997; 24:271-6. [PMID: 9515340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Prevention of infection can be a minefield of uncertainty. There is little consensus of opinion on the objective criteria for diagnosing wound infection, and experts disagree on whether antibiotics should be routinely provided as prophylaxis in dental surgery. This article sets out the arguments for and against the prophylactic use of antibiotics in dental procedures.
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Walters H. Idiopathic rhabdomyolysis. J R Soc Med 1997; 90:120. [PMID: 9068452 PMCID: PMC1296166 DOI: 10.1177/014107689709000229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
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