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Marshall J, Huynh K, Lancaster G, Ng J, Collins J, Pernes G, Liang A, Featherby T, Mellet N, Drew B, Calkin A, King A, Meikle P, Febbraio M, Adlard P, Henstridge D. Behavioral, metabolic, and lipidomic characterization of the 5xFADxTg30 mouse model of Alzheimer's disease. iScience 2024; 27:108800. [PMID: 38292430 PMCID: PMC10826307 DOI: 10.1016/j.isci.2024.108800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 10/23/2023] [Accepted: 01/02/2024] [Indexed: 02/01/2024] Open
Abstract
Alzheimer's disease (AD) is associated with both extracellular amyloid-β (Aβ) plaques and intracellular tau-containing neurofibrillary tangles (NFT). We characterized the behavioral, metabolic and lipidomic phenotype of the 5xFADxTg30 mouse model which contains overexpression of both Aβ and tau. Our results independently reproduce several phenotypic traits described previously for this model, while providing additional characterization. This model develops many aspects associated with AD including frailty, decreased survival, initiation of aspects of cognitive decline and alterations to specific lipid classes and molecular lipid species in the plasma and brain. Notably, some sex-specific differences exist in this model and motor impairment with aging in this model does compromise the utility of the model for some movement-based behavioral assessments of cognitive function. These findings provide a reference for individuals interested in using this model to understand the pathology associated with elevated Aβ and tau or for testing potential therapeutics for the treatment of AD.
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Affiliation(s)
- J.P.S. Marshall
- Baker Heart and Diabetes Institute, Melbourne, VIC, Australia
- School of Medicine, Dentistry and Health Sciences, The University of Melbourne, Parkville, VIC, Australia
- The Florey Institute of Neuroscience and Mental Health, Melbourne, VIC, Australia
| | - K. Huynh
- Baker Heart and Diabetes Institute, Melbourne, VIC, Australia
- Baker Department of Cardiometabolic Health, University of Melbourne, Parkville, VIC, Australia
- Baker Department of Cardiovascular Research Translation and Implementation, La Trobe University, Bundoora, VIC, Australia
| | - G.I. Lancaster
- Baker Heart and Diabetes Institute, Melbourne, VIC, Australia
- Department of Immunology, Monash University, Melbourne, VIC, Australia
| | - J. Ng
- School of Health Sciences, The University of Tasmania, Launceston, TAS, Australia
| | - J.M. Collins
- Wicking Dementia Research and Education Centre, College of Health and Medicine, University of Tasmania, Hobart, TAS, Australia
| | - G. Pernes
- Baker Heart and Diabetes Institute, Melbourne, VIC, Australia
| | - A. Liang
- Baker Heart and Diabetes Institute, Melbourne, VIC, Australia
| | - T. Featherby
- The Florey Institute of Neuroscience and Mental Health, Melbourne, VIC, Australia
| | - N.A. Mellet
- Baker Heart and Diabetes Institute, Melbourne, VIC, Australia
| | - B.G. Drew
- Baker Heart and Diabetes Institute, Melbourne, VIC, Australia
- Baker Department of Cardiometabolic Health, University of Melbourne, Parkville, VIC, Australia
- Central Clinical School, Monash University, Melbourne, VIC, Australia
| | - A.C. Calkin
- Baker Heart and Diabetes Institute, Melbourne, VIC, Australia
- Baker Department of Cardiometabolic Health, University of Melbourne, Parkville, VIC, Australia
- Central Clinical School, Monash University, Melbourne, VIC, Australia
| | - A.E. King
- Wicking Dementia Research and Education Centre, College of Health and Medicine, University of Tasmania, Hobart, TAS, Australia
| | - P.J. Meikle
- Baker Heart and Diabetes Institute, Melbourne, VIC, Australia
- Baker Department of Cardiometabolic Health, University of Melbourne, Parkville, VIC, Australia
- Baker Department of Cardiovascular Research Translation and Implementation, La Trobe University, Bundoora, VIC, Australia
| | - M.A. Febbraio
- Monash Institute of Pharmaceutical Sciences, Melbourne, VIC, Australia
| | - P.A. Adlard
- The Florey Institute of Neuroscience and Mental Health, Melbourne, VIC, Australia
| | - D.C. Henstridge
- Baker Heart and Diabetes Institute, Melbourne, VIC, Australia
- School of Health Sciences, The University of Tasmania, Launceston, TAS, Australia
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Klose M, Huynh K, Krogsgaard K, Drejer J, Pharm D, Byberg S, Madsbad S, Magkos F, Researcher S, Aharaz A, Edsberg B, Tfelt J, Astrup A, Feldt-Rasmussen U. ODP350 Safety and Efficacy of Tesomet over 48 Weeks of Treatment: Results From a 24-Week Phase 2, Randomized, Double-Blind Study With 24 Week Open-Label Extension in Adults With Hypothalamic Obesity. J Endocr Soc 2022. [DOI: 10.1210/jendso/bvac150.1059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Abstract
Objective
To assess the safety and efficacy of Tesomet (tesofensine plus metoprolol) in adults with hypothalamic obesity, a rare disease with no approved therapy.
Research Design and Methods
Twenty-one adults with hypothalamic obesity (16 females, 5 males) were randomized to Tesomet (0.5 mg tesofensine/50 mg metoprolol) (n=14) or placebo (n=8) during a 24-week double-blind period. On completion of the double-blind period, 17 (81%) subjects (11 Tesomet; 6 placebo) entered in to a 24-week open-label extension period and were treated with Tesomet. The primary endpoint was safety while secondary endpoints included measures of body weight, waist circumference, and body composition. Trial NCT03845075.
Results
The most common adverse events following the 24-week double-blind period and the 24-week open-label extension period were sleep disorder, dizziness, dry mouth, and headache; the majority of these adverse events were mild to moderate in severity. No significant nor clinically meaningful changes in heart rate or blood pressure were observed during the study. On completion of the double-blind period mean change in body weight (kg) was -7.84 for the Tesomet group versus -0.34 kg for the placebo group (P=0. 03). At the end of the open-label extension period mean change in body weight (kg) from baseline was -6.34 for the Tesomet-Tesomet group and -6. 03 for the placebo-Tesomet group. On completion of the double-blind period mean change in waist circumference (cm) was -7. 09 cm for the Tesomet group versus -1.16 for the placebo group (P=NS). At the end of the open-label extension period mean change in waist circumference (cm) from baseline was -5.73 for the Tesomet-Tesomet group and -3. 04 for the placebo-Tesomet group. On completion of the double-blind period mean change in fat mass (kg) was -5.28 for the Tesomet group versus -1.11 for the placebo group (P=NS). At the end of the open-label extension period mean change in fat mass (kg) from baseline was -4.84 for the Tesomet-Tesomet group and -3.85 for the placebo-Tesomet group. On completion of the double-blind period mean change in lean tissue mass (kg) was -2.76 for the Tesomet group versus 0.36 for the placebo group (P<0. 01). At the end of the open-label extension period mean change in lean mass (kg) from baseline was -1.64 for the Tesomet-Tesomet group and -2.22 for the placebo-Tesomet group.
Discussion
Tesomet was generally well tolerated after 48 weeks treatment and resulted in clinically meaningful improvements in body weight and body composition measures in adults with hypothalamic obesity. In contrast to previous studies of tesofensine monotherapy in general obesity, no significant nor clinically meaningful changes in cardiovascular measures were observed during the study.
Conclusion
Tesomet is a promising new experimental treatment for hypothalamic obesity. A randomized, placebo controlled, multi-center, dose-finding, Phase 2b study has now been initiated.
Presentation: No date and time listed
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Chung S, Huynh K, Chen Y, Yap P, Goralski J, Donaldson S, Lee Y. 453 Ventilation defect percentage comparison between spiral with post-acquisition denoising and cartesian acquisition for 19F lung magnetic resonance imaging. J Cyst Fibros 2022. [DOI: 10.1016/s1569-1993(22)01143-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Scheinberg T, Fitzpatrick M, Lin HM, Azad A, Bonnitcha P, Davies A, Heller G, Huynh K, Mak B, Mahon K, Meikle P, Sullivan D, Horvath L. 1409P Development of a clinically accessible, circulating prognostic lipid biomarker panel in men with mCRPC to guide potential metabolic intervention. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.07.1895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Ahmed K, Breuer J, Huynh K, Abi-Jaoudeh N. Abstract No. 277 Racial disparity in acute pulmonary embolism treatment. J Vasc Interv Radiol 2022. [DOI: 10.1016/j.jvir.2022.03.358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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Huynh K, Klose M, Krogsgaard K, Drejer J, Byberg S, Madsbad S, Magkos F, Aharaz A, Edsberg B, Tfelt-Hansen J, Astrup AV, Feldt-Rasmussen U. Randomized controlled trial of Tesomet for weight loss in hypothalamic obesity. Eur J Endocrinol 2022; 186:687-700. [PMID: 35294397 PMCID: PMC9175551 DOI: 10.1530/eje-21-0972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Accepted: 03/16/2022] [Indexed: 11/21/2022]
Abstract
CONTEXT Hypothalamic injury often leads to rapid, intractable weight gain causing hypothalamic obesity, which is associated with increased risk of cardiovascular and metabolic morbidity and mortality. There are no approved or effective pharmacological treatments for hypothalamic obesity, and conventional lifestyle management remains ineffective. OBJECTIVE To investigate the safety and efficacy of Tesomet (0.5 mg tesofensine/50 mg metoprolol) in adults with hypothalamic obesity. METHODS Twenty-one adults with hypothalamic obesity (16 females) were randomized to Tesomet (0.5 mg/50 mg) or placebo for 24 weeks. Patients also received diet/lifestyle counselling. The primary endpoint was safety; secondary endpoints included measures of body weight, appetite scores, quality of life, and metabolic profile. RESULTS Eighteen patients completed 24 weeks. Consent withdrawal, eligibility, and serious adverse events (SAE) unrelated to treatment resulted in dropouts. One patient experienced a Tesomet-related SAE of exacerbated pre-existing anxiety leading to treatment discontinuation. Tesomet-related adverse events were otherwise mostly mild and included sleep disturbances (Tesomet 50%, placebo 13%), dry mouth (Tesomet 43%, placebo 0%), and headache (Tesomet 36%, placebo 0%). No significant differences in heart rate or blood pressure were observed between groups. Compared to placebo, Tesomet resulted in additional mean (95% CI) weight change of -6.3% ((-11.3; -1.3); P = 0.017), increased the number of patients achieving ≥5% weight loss (Tesomet 8/13, placebo 1/8; P = 0.046), and tended to augment the reduction in waist circumference by 5.7 cm ((-0.1; 11.5); P = 0.054). CONCLUSION Tesomet was welltolerated, did not affect heart rate or blood pressure, and resulted in significant reductions in body weight compared to placebo in adults with hypothalamic obesity.
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Affiliation(s)
- Kim Huynh
- Department of Medical Endocrinology and Metabolism PE 2131/2, Copenhagen University Hospital (Rigshospitalet), Copenhagen Ø, Denmark
| | - Marianne Klose
- Department of Medical Endocrinology and Metabolism PE 2131/2, Copenhagen University Hospital (Rigshospitalet), Copenhagen Ø, Denmark
| | | | | | - Sarah Byberg
- Department of Biomedical Sciences, University of Copenhagen, Copenhagen N, Denmark
| | - Sten Madsbad
- Department of Endocrinology, Hvidovre University Hospital, University of Copenhagen, Hvidovre, Denmark
- Department of Clinical Medicine, Faculty of Health and Clinical Sciences, Copenhagen, Copenhagen N, Denmark
| | - Faidon Magkos
- Department of Nutrition, Exercise and Sports (NEXS), University of Copenhagen, Frederiksberg C, Denmark
| | | | | | - Jacob Tfelt-Hansen
- Department of Cardiology, The Heart Centre, Copenhagen University Hospital (Rigshospitalet), Copenhagen Ø, Denmark
- Department of Forensic Medicine, Faculty of Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Arne Vernon Astrup
- Department of Nutrition, Exercise and Sports (NEXS), University of Copenhagen, Frederiksberg C, Denmark
| | - Ulla Feldt-Rasmussen
- Department of Medical Endocrinology and Metabolism PE 2131/2, Copenhagen University Hospital (Rigshospitalet), Copenhagen Ø, Denmark
- Department of Clinical Medicine, Faculty of Health and Clinical Sciences, Copenhagen, Copenhagen N, Denmark
- Correspondence should be addressed to U Feldt-Rasmussen;
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Fernando H, Duong T, Huynh K, Noonan J, Shaw J, Duffy S, Nehme Z, Smith K, Myles P, Meikle P, Peter K, Stub D. Lignocaine versus opioids in coronary intervention: assessing antiplatelet activity and ticagrelor levels (LOCAL) study. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.2991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Opioid analgesia impairs the bioavailability and antiplatelet effect of oral P2Y12 inhibitors prompting investigation of mitigation strategies including identifying alternative analgesic agents.
Purpose
To assess the impact of intravenous fentanyl and lignocaine on the bioavailability and antiplatelet effect of ticagrelor in patients with unstable angina and non-ST elevation myocardial infarction, as well as their procedural analgesic efficacy and safety.
Methods
The LOCAL trial was a prospective, single centre, double-blind, randomized, controlled trial where intravenous lignocaine was the experimental analgesic agent assessed in this trial compared to intravenous fentanyl as procedural analgesia during coronary angiography and percutaneous coronary intervention. Patients with an indication for dual antiplatelet therapy and no contraindication were given 180mg of ticagrelor orally as integral tablets with 250 mL of tap water at the end of the case. Blood was sampled at time 0, 0.5, 1, 2 and 4 hours post administration of ticagrelor for pharmacokinetic and comprehensive pharmacodynamic analysis.
Results
Seventy patients undergoing coronary angiography with an indication for ticagrelor loading were included in the pharmacokinetic and pharmacodynamic analysis. Plasma ticagrelor levels at 2 h post loading dose were significantly lower in the fentanyl compared to lignocaine treatment arm (476 vs. 792 ng/mL, p=0.02, see figure 1). The area under the plasma-time curves for ticagrelor (987 vs. 2189 ng.h/mL, p=0.001) and its active metabolite (173 vs. 394 ng.h/mL, p<0.001) were both significantly lower in the fentanyl arm. Platelet reactivity assessed by the VerifyNow assay was higher at all time points after baseline in the fentanyl compared to lignocaine arm. The VASP flow cytometry assay demonstrated higher platelet reactivity at 2 hours in the fentanyl group (40% vs. 22% platelet reactivity index, p=0.001). The Multiplate Analyzer demonstrated higher platelet reactivity in the fentanyl arm at 60 minutes (43 vs. 26 area under the curve units, p=0.001) as did expression of activated platelet GpIIb/IIIa receptor (2829 vs. 1426 geometric mean fluorescence intensity (GMFI), p=0.006) and P-selectin (439 vs. 211 GMFI, p=0.001). High on-treatment platelet reactivity (HPR) was significantly higher in the fentanyl arm at 60 min using the MPA (41% vs. 9%, p=0.002) and 120 min using the VFN (30% vs. 3%, p=0.003) and VASP (37% vs. 6%, p=0.002) assays (see figure 2). Both drugs were well tolerated with a high level of patient satisfaction (fentanyl 94% vs. lignocaine 97%, p=0.56).
Conclusion(s)
Unlike fentanyl, lignocaine does not impair the bioavailability or delay the antiplatelet effect of ticagrelor. Both drugs were well tolerated and effective with a high level of patient satisfaction for procedural analgesia. Systemic pain medication during PCI should be reconsidered and if performed, lignocaine is a beneficial alternative to fentanyl.
Funding Acknowledgement
Type of funding sources: Public grant(s) – National budget only. Main funding source(s): TBA Figure 1. Ticagrelor and AM pharmacokineticsFigure 2. Ticagrelor pharmacodynamics
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Affiliation(s)
- H Fernando
- The Alfred Hospital, Cardiology, Melbourne, Australia
| | - T Duong
- Baker Heart and Diabetes Institute, Melbourne, Australia
| | - K Huynh
- Baker Heart and Diabetes Institute, Melbourne, Australia
| | - J Noonan
- Baker Heart and Diabetes Institute, Melbourne, Australia
| | - J Shaw
- The Alfred Hospital, Cardiology, Melbourne, Australia
| | - S Duffy
- The Alfred Hospital, Cardiology, Melbourne, Australia
| | - Z Nehme
- Monash University, Melbourne, Australia
| | - K Smith
- Monash University, Melbourne, Australia
| | - P Myles
- The Alfred Hospital, Cardiology, Melbourne, Australia
| | - P Meikle
- Baker Heart and Diabetes Institute, Melbourne, Australia
| | - K Peter
- Baker Heart and Diabetes Institute, Melbourne, Australia
| | - D Stub
- The Alfred Hospital, Cardiology, Melbourne, Australia
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Huynh K, Kempegowda P, Tamblyn J, O' Reilly MW, Mueller JW, Hewison M, Jenkinson C. Development of a LC-MS/MS method to measure serum 3-sulfate and 3-glucuronide 25-hydroxyvitamin D3 metabolites; comparisons to unconjugated 25OHD in pregnancy and polycystic ovary syndrome. Steroids 2021; 169:108812. [PMID: 33636208 DOI: 10.1016/j.steroids.2021.108812] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2020] [Revised: 01/30/2021] [Accepted: 02/16/2021] [Indexed: 11/16/2022]
Abstract
Vitamin D status is routinely assessed by measuring circulating concentrations of 25-hydroxyvitamin D (25OHD2 or 25OHD3). However as deconjugation is not routinely incorporated into sample treatment prior to analysis, conjugated forms of 25OHD (particularly the more abundant 25OHD3) are often not considered in determining serum concentrations of total 25OHD. Two major circulating conjugated forms of 25OHD3 are 25-hydroxyvitamin D3-3-sulfate (25OHD3-S) and 25-hydroxyvitamin D3-3-glucuronide (25OHD3-G). Incorporating these two conjugated metabolites into the measurement of vitamin D status could improve our understanding of vitamin D status in health, particularly if there are changes in sulfation and glucuronidation activities. The aim of this study was to develop a liquid chromatography tandem-mass spectrometry (LC-MS/MS) targeted method for measurement of 25OHD3-S and 25OHD3-G in serum to enable comparisons with circulating levels of the free 25OHD3 form. We developed and validated a new LC-MS/MS method that measured both 25OHD3-S and 25OHD3-G following a solid phase extraction sample preparation method. Partial separation of analytes by LC, and the separation of analytes by the optimized multiple reaction monitoring transitions enabled the quantitation of both 25OHD3-S and 25OHD3-G in the single method. Serum concentrations of 25OHD3-S (24.7 ± 11.8 ng/mL) and 25OHD3-G (2.4 ± 1.2 ng/mL) were shown to be a significant proportion of circulating vitamin D metabolites in healthy donor serums. These levels of 25OHD3-S and 25OHD3-G closely associated with 25OHD3 concentrations, r = 0.728, p = 0.001 and r = 0.632, p = 0.006 respectively. However in serum from pregnant women and non-pregnant women with polycystic ovary syndrome (PCOS) significant differences in the ratios between conjugated and free 25OHD3 were observed between pregnancy groups (25OHD3/25OHD3-S and 25OHD3/25OHD3-G p < 0.001), and between healthy and PCOS subjects (25OHD3/25OHD3-G p < 0.050). Development of this novel high-throughput LC-MS/MS method indicates that 25OHD3-S and 25OHD3-G are substantial components of circulating vitamin D metabolites. The concentrations of these metabolites relative to conventional 25OHD3 may vary in different physiological and pathophysiological settings, and may therefore play an unrecognized but important role in the actions of vitamin D.
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Affiliation(s)
- K Huynh
- Institute of Metabolism and Systems Research, University of Birmingham, Birmingham, UK
| | - P Kempegowda
- Institute of Metabolism and Systems Research, University of Birmingham, Birmingham, UK
| | - J Tamblyn
- Institute of Metabolism and Systems Research, University of Birmingham, Birmingham, UK
| | - M W O' Reilly
- Institute of Metabolism and Systems Research, University of Birmingham, Birmingham, UK; Department of Medicine, Royal College of Surgeons in Ireland, University of Medicine and Health Sciences, Dublin, Ireland
| | - J W Mueller
- Institute of Metabolism and Systems Research, University of Birmingham, Birmingham, UK
| | - M Hewison
- Institute of Metabolism and Systems Research, University of Birmingham, Birmingham, UK
| | - C Jenkinson
- Institute of Metabolism and Systems Research, University of Birmingham, Birmingham, UK.
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Magaye R, Savira F, Xiong X, Donner D, Kiriazis H, Brown A, Huang L, Mellet N, Huynh K, Meikle P, Reid C, Flynn B, Kaye D, Liew D, Wang B. Des-1 Inhibition Attenuated Cardiac Remodelling in a Mouse Model of Ischaemia Reperfusion. Heart Lung Circ 2021. [DOI: 10.1016/j.hlc.2021.06.061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Fernando H, Duong T, Huynh K, Noonan J, Shaw J, Duffy S, Nehme Z, Smith K, Myles P, Meikle P, Peter K, Stub D. Lignocaine Versus Opioids in Coronary Intervention: Assessing Antiplatelet Activity and Ticagrelor Levels (LOCAL) Study. Heart Lung Circ 2021. [DOI: 10.1016/j.hlc.2021.06.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Galiabovitch E, Huynh K, McCahy P. Ambulatory extracorporeal shockwave lithotripsy in Australia. EUR UROL SUPPL 2020. [DOI: 10.1016/s2666-1683(20)33857-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Pradas I, Jové M, Huynh K, Puig J, Ingles M, Borras C, Viña J, Meikle PJ, Pamplona R. Exceptional human longevity is associated with a specific plasma phenotype of ether lipids. Redox Biol 2019; 21:101127. [PMID: 30711699 PMCID: PMC6357979 DOI: 10.1016/j.redox.2019.101127] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 01/09/2019] [Accepted: 01/28/2019] [Indexed: 12/15/2022] Open
Abstract
A lipid profile resistant to oxidative damage is an inherent trait associated with animal lifespan. However, there is a lack of lipidomic studies on human longevity. Here we use mass spectrometry based technologies to detect and quantify 137 ether lipids to define a phenotype of healthy humans with exceptional lifespan. Ether lipids were chosen because of their antioxidant properties and ability to modulate oxidative stress. Our results demonstrate that a specific ether lipid signature can be obtained to define the centenarian state. This profile comprises higher level of alkyl forms derived from phosphatidylcholine with shorter number of carbon atoms and double bonds; and decreased content in alkenyl forms from phosphatidylethanolamine with longer chain length and higher double bonds. This compositional pattern suggests that ether lipids from centenarians are more resistant to lipid peroxidation, and that ether lipid signature expresses an optimized feature associated with exceptional human longevity. These results are in keeping with the free radical theory of aging.
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Affiliation(s)
- I Pradas
- Department of Experimental Medicine, University of Lleida-Institute for Research in Biomedicine of Lleida (UdL-IRBLleida), Lleida 25198, Spain.
| | - M Jové
- Department of Experimental Medicine, University of Lleida-Institute for Research in Biomedicine of Lleida (UdL-IRBLleida), Lleida 25198, Spain.
| | - K Huynh
- Baker Heart and Diabetes Institute, Melbourne, VIC 3004, Australia.
| | - J Puig
- Girona Biomedical Research Institute (IDIBGI), Hospital Universitari Dr Josep Trueta, Girona 17007, Spain.
| | - M Ingles
- Department of Physiology, University of Valencia, Valencia 46004, Spain.
| | - C Borras
- Department of Physiology, University of Valencia, Valencia 46004, Spain.
| | - J Viña
- Department of Physiology, University of Valencia, Valencia 46004, Spain.
| | - P J Meikle
- Baker Heart and Diabetes Institute, Melbourne, VIC 3004, Australia.
| | - R Pamplona
- Department of Experimental Medicine, University of Lleida-Institute for Research in Biomedicine of Lleida (UdL-IRBLleida), Lleida 25198, Spain.
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Charbek E, Huynh K, Kim E, Nayak RP. Assessment of Cognitive Impairment in Patients with Chronic Obstructive Pulmonary Disease Using the Rapid Cognitive Screen. J Nutr Health Aging 2019; 23:102-104. [PMID: 30569077 DOI: 10.1007/s12603-018-1146-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
OBJECTIVES To determine the prevalence of cognitive impairment in chronic obstructive pulmonary disease (COPD) patients using the Rapid Cognitive Screen (RCS). DESIGN Cross sectional study. PARTICIPANTS A total of 106 men and women with COPD 50 years of age or older. SETTING Pulmonary ambulatory clinic in a tertiary academic center in St. Louis, Missouri, USA. MEASUREMENTS We enrolled patients with COPD who completed the RCS tool. Patients were classified as having normal cognition, mild cognitive impairment (MCI), or dementia if they scored ≥ 8, 6-7, or ≤ 5, respectively. The prevalence of each category was measured, and patients' baseline characteristics were compared. RESULTS One hundred and six patients completed the RCS. Of those, 36 (33.9%) patients scored ≤ 5 on the RCS, 33 (31.1%) scored 6 or 7, and 37 (34.9%) scored ≥ 8. The prevalence of dementia, MCI, and normal cognition were 33.9%, 31.1%, and 34.9%, respectively. Baseline lung function was not different between patients with normal cognition and those with abnormal cognition (FEV1 1.53 ± 0.39 vs 1.45 ± 0.32 L). In patients with abnormal cognition, there was no difference in patients' characteristics between patients with MCI or dementia. CONCLUSION Cognitive impairment is highly prevalent in patients with COPD. RCS successfully identified cognitive impairment in COPD. We recommend performing RCS in patients with COPD routinely.
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Affiliation(s)
- E Charbek
- Edward Charbek, Saint Louis University, St. Louis, MO, USA, Email Address:
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Meikle P, Jayawardana KS, Mundra PA, Nestel PJ, Barnes EH, Kirby A, Thompson P, Sullivan DR, Alshehry ZH, Huynh K, Giles C, Marschner IC, Kingwell BA, Simes J, Tonkin AM. P1875Changes in plasma lipid species following pravastatin treatment predict cardiovascular outcomes and represent a measure of the relative risk reduction in secondary prevention. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p1875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- P Meikle
- Baker IDI Heart and Diabetes Institute, Melbourne, Australia
| | - K S Jayawardana
- Baker IDI Heart and Diabetes Institute, Melbourne, Australia
| | - P A Mundra
- Baker IDI Heart and Diabetes Institute, Melbourne, Australia
| | - P J Nestel
- Baker IDI Heart and Diabetes Institute, Melbourne, Australia
| | | | - A Kirby
- University of Sydney, Sydney, Australia
| | - P Thompson
- Sir Charles Gairdner Hospital, Perth, Australia
| | | | | | - K Huynh
- Baker IDI Heart and Diabetes Institute, Melbourne, Australia
| | - C Giles
- Baker IDI Heart and Diabetes Institute, Melbourne, Australia
| | | | - B A Kingwell
- Baker IDI Heart and Diabetes Institute, Melbourne, Australia
| | - J Simes
- University of Sydney, Sydney, Australia
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Tham Y, Bernardo B, Huynh K, Ooi J, Gao X, Kiriazis H, Meikle P, McMullen J. Lipidomic Profiles of the Heart and Circulation in Response to Exercise Versus Cardiac Pathology. Heart Lung Circ 2018. [DOI: 10.1016/j.hlc.2018.06.154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Huynh K, Holdren S, Hu J, Wang L, Zachariah MR, Eichhorn BW. Dimethyl Methylphosphonate Adsorption Capacities and Desorption Energies on Ordered Mesoporous Carbons. ACS Appl Mater Interfaces 2017; 9:40638-40644. [PMID: 29083156 DOI: 10.1021/acsami.7b12033] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this study, we determine effective adsorption capacities and desorption energies for DMMP with highly ordered mesoporous carbons (OMCs), 1D cylindrical FDU-15, 3D hexagonal CMK-3, 3D bicontinuous CMK-8, and as a reference, microporous BPL carbon. After exposure to DMMP vapor at room temperature for approximately 70 and 800 h, the adsorption capacity of DMMP for each OMC was generally proportional to the total surface area and pore volume, respectively. Desorption energies of DMMP were determined using a model-free isoconversional method applied to thermogravimetric analysis (TGA) data. Our experiments determined that DMMP saturated carbon will desorb any weakly bound DMMP from pores >2.4 nm at room temperature, and no DMMP will adsorb into pores smaller than 0.5 nm. The calculated desorption energies for high surface coverages, 25% DMMP desorbed from pores ≤2.4 nm, are 68-74 kJ mol-1, which is similar to the DMMP heat of vaporization (52 kJ mol-1). At lower surface coverages, 80% DMMP desorbed, the DMMP desorption energies from the OMCs are 95-103 kJ mol-1. This is overall 20-30 kJ mol-1 higher in comparison to that of BPL carbon, due to the pore size and diffusion through different porous networks.
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Affiliation(s)
- Kim Huynh
- Department of Chemistry and Biochemistry, University of Maryland , College Park, Maryland 20742, United States
| | - Scott Holdren
- Department of Chemistry and Biochemistry, University of Maryland , College Park, Maryland 20742, United States
| | - Junkai Hu
- Department of Chemistry and Biochemistry, University of Maryland , College Park, Maryland 20742, United States
| | - Luning Wang
- Department of Chemistry and Biochemistry, University of Maryland , College Park, Maryland 20742, United States
| | - Michael R Zachariah
- Department of Chemical Engineering and Chemistry, University of Maryland , College Park, Maryland 20742, United States
- Department of Chemistry and Biochemistry, University of Maryland , College Park, Maryland 20742, United States
| | - Bryan W Eichhorn
- Department of Chemistry and Biochemistry, University of Maryland , College Park, Maryland 20742, United States
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18
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Knowles EEM, Huynh K, Meikle PJ, Göring HHH, Olvera RL, Mathias SR, Duggirala R, Almasy L, Blangero J, Curran JE, Glahn DC. The lipidome in major depressive disorder: Shared genetic influence for ether-phosphatidylcholines, a plasma-based phenotype related to inflammation, and disease risk. Eur Psychiatry 2017; 43:44-50. [PMID: 28365467 DOI: 10.1016/j.eurpsy.2017.02.479] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 01/27/2017] [Accepted: 02/06/2017] [Indexed: 01/23/2023] Open
Abstract
BACKGROUND The lipidome is rapidly garnering interest in the field of psychiatry. Recent studies have implicated lipidomic changes across numerous psychiatric disorders. In particular, there is growing evidence that the concentrations of several classes of lipids are altered in those diagnosed with MDD. However, for lipidomic abnormalities to be considered potential treatment targets for MDD (rather than secondary manifestations of the disease), a shared etiology between lipid concentrations and MDD should be demonstrated. METHODS In a sample of 567 individuals from 37 extended pedigrees (average size 13.57 people, range=3-80), we used mass spectrometry lipidomic measures to evaluate the genetic overlap between twenty-three biologically distinct lipid classes and a dimensional scale of MDD. RESULTS We found that the lipid class with the largest endophenotype ranking value (ERV, a standardized parametric measure of pleiotropy) were ether-phosphodatidylcholines (alkylphosphatidylcholine, PC(O) and alkenylphosphatidylcholine, PC(P) subclasses). Furthermore, we examined the cluster structure of the twenty-five species within the top-ranked lipid class, and the relationship of those clusters with MDD. This analysis revealed that species containing arachidonic acid generally exhibited the greatest degree of genetic overlap with MDD. CONCLUSIONS This study is the first to demonstrate a shared genetic etiology between MDD and ether-phosphatidylcholine species containing arachidonic acid, an omega-6 fatty acid that is a precursor to inflammatory mediators, such as prostaglandins. The study highlights the potential utility of the well-characterized linoleic/arachidonic acid inflammation pathway as a diagnostic marker and/or treatment target for MDD.
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Affiliation(s)
- E E M Knowles
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA.
| | - K Huynh
- Baker Heart and Diabetes Institute, Melbourne, Australia
| | - P J Meikle
- Baker Heart and Diabetes Institute, Melbourne, Australia
| | - H H H Göring
- South Texas Diabetes and Obesity Institute, University of Texas Rio Grande Valley School of Medicine, Brownsville, TX, USA
| | - R L Olvera
- Department of Psychiatry, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - S R Mathias
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA
| | - R Duggirala
- South Texas Diabetes and Obesity Institute, University of Texas Rio Grande Valley School of Medicine, Brownsville, TX, USA
| | - L Almasy
- South Texas Diabetes and Obesity Institute, University of Texas Rio Grande Valley School of Medicine, Brownsville, TX, USA
| | - J Blangero
- South Texas Diabetes and Obesity Institute, University of Texas Rio Grande Valley School of Medicine, Brownsville, TX, USA
| | - J E Curran
- South Texas Diabetes and Obesity Institute, University of Texas Rio Grande Valley School of Medicine, Brownsville, TX, USA
| | - D C Glahn
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA; Olin Neuropsychiatric Research Center, Institute of Living, Hartford Hospital, Hartford, CT, USA
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Mundra P, Barlow C, Mellett N, Huynh K, Alshehry Z, Wong G, Kingwell B, Nestel P, Thompson P, Sullivan D, Barnes E, Simes J, Tonkin A, Meikle P. Plasma lipidomic profiles improve upon conventional risk factors to predict cardiovascular events. Atherosclerosis 2016. [DOI: 10.1016/j.atherosclerosis.2016.07.100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Long JW, Wallace JM, Peterson GW, Huynh K. Manganese Oxide Nanoarchitectures as Broad-Spectrum Sorbents for Toxic Gases. ACS Appl Mater Interfaces 2016; 8:1184-1193. [PMID: 26741498 DOI: 10.1021/acsami.5b09508] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We demonstrate that sol-gel-derived manganese oxide (MnOx) nanoarchitectures exhibit broad-spectrum filtration activity for three chemically diverse toxic gases: NH3, SO2, and H2S. Manganese oxides are synthesized via the reaction of NaMnO4 and fumaric acid to form monolithic gels of disordered, mixed-valent Na-MnOx; incorporated Na(+) is readily exchanged for H(+) by subsequent acid rinsing to form a more crystalline H-MnOx phase. For both Na-MnOx and H-MnOx forms, controlled pore-fluid removal yields either densified, yet still mesoporous, xerogels or low-density aerogels (prepared by drying from supercritical CO2). The performance of these MnOx nanoarchitectures as filtration media is assessed using dynamic-challenge microbreakthrough protocols. We observe technologically relevant sorption capacities under both dry conditions and wet (80% relative humidity) for each of the three toxic industrial chemicals investigated. The Na-MnOx xerogels and aerogels provide optimal performance with the aerogel exhibiting maximum sorption capacities of 39, 200, and 680 mg g(-1) for NH3, SO2, and H2S, respectively. Postbreakthrough characterization using X-ray photoelectron spectroscopy (XPS) and diffuse-reflectance infrared Fourier transform spectroscopy (DRIFTS) confirms that NH3 is captured and partially protonated within the MnOx structure, while SO2 undergoes oxidation by the redox-active oxide to form adsorbed sulfate at the MnOx surface. Hydrogen sulfide is also oxidized to form a combination of sulfate and sulfur/polysulfide products, concomitant with a decrease in the average Mn oxidation state from 3.43 to 2.94 and generation of a MnOOH phase.
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Affiliation(s)
- Jeffrey W Long
- Code 6170, Surface Chemistry Branch, U.S. Naval Research Laboratory , Washington, D.C. 20375, United States
| | - Jean M Wallace
- Nova Research, Inc. , Alexandria, Virginia 22308, United States
| | - Gregory W Peterson
- U.S. Army Research, Development and Engineering Command, Edgewood Chemical Biological Center , Aberdeen Proving Ground, Maryland 21010, United States
| | - Kim Huynh
- Department of Chemistry and Biochemistry, University of Maryland , College Park, Maryland 20742, United States
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Wang G, Huynh K, Barhate R, Liu J, Tam P, Rodrigues W, Coulter C, Moore C, Soares J. Validation of a New Recombinant Antibody Fragment (rFab)-Based Homogeneous Enzyme Immunoassay for the Highly Specific Detection of 6-Acetylmorphine in Urine. J Anal Toxicol 2015; 39:726-33. [DOI: 10.1093/jat/bkv090] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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Rasmiena A, Stefanovic N, Huynh K, Tan R, Barlow C, Tull D, deHaan J, Meikle P. Attenuation of atherosclerosis in ApoE- and ApoE/GPX1-deficient mice by plasmalogen enrichment. Atherosclerosis 2015. [DOI: 10.1016/j.atherosclerosis.2015.04.051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Khan A, Nestel P, Straznicky N, Mundra P, Huynh K, Mellett N, Wong G, Weir J, Barlow C, NG T, Kingwell B, Meikle P. Effect of weight loss and exercise on the high-density lipoprotein (HDL) lipidome in individuals with metabolic syndrome (METS). Atherosclerosis 2015. [DOI: 10.1016/j.atherosclerosis.2015.04.919] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Tham Y, Ooi J, Mellett N, Gao X, Huynh K, Meikle P, McMullen J. Differential cardiac expression of individual lipids in the plasmalogen biosynthetic pathway in response to pressure overload in mice. Heart Lung Circ 2015. [DOI: 10.1016/j.hlc.2015.06.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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25
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Ritchie RH, Love JE, Huynh K, Bernardo BC, Henstridge DC, Kiriazis H, Tham YK, Sapra G, Qin C, Cemerlang N, Boey EJH, Jandeleit-Dahm K, Du XJ, McMullen JR. Enhanced phosphoinositide 3-kinase(p110α) activity prevents diabetes-induced cardiomyopathy and superoxide generation in a mouse model of diabetes. Diabetologia 2012; 55:3369-81. [PMID: 23001375 DOI: 10.1007/s00125-012-2720-0] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2012] [Accepted: 08/10/2012] [Indexed: 12/12/2022]
Abstract
AIMS/HYPOTHESIS Diabetic cardiomyopathy is characterised by diastolic dysfunction, oxidative stress, fibrosis, apoptosis and pathological cardiomyocyte hypertrophy. Phosphoinositide 3-kinase (PI3K)(p110α) is a cardioprotective kinase, but its role in the diabetic heart is unknown. The aim of this study was to assess whether PI3K(p110α) plays a critical role in the induction of diabetic cardiomyopathy, and whether increasing PI3K(p110α) activity in the heart can prevent the development of cardiac dysfunction in a setting of diabetes. METHODS Type 1 diabetes was induced with streptozotocin in adult male cardiac-specific transgenic mice with increased PI3K(p110α) activity (constitutively active PI3K [p110α], caPI3K] or decreased PI3K(p110α) activity (dominant-negative PI3K [p110α], dnPI3K) and non-transgenic (Ntg) mice for 12 weeks. Cardiac function, histological and molecular analyses were performed. RESULTS Diabetic Ntg mice displayed diastolic dysfunction and increased cardiomyocyte size, expression of atrial and B-type natriuretic peptides (Anp, Bnp), fibrosis and apoptosis, as well as increased superoxide generation and increased protein kinase C β2 (PKCβ2), p22 ( phox ) and apoptosis signal-regulating kinase 1 (Ask1) expression. Diabetic dnPI3K mice displayed an exaggerated cardiomyopathy phenotype compared with diabetic Ntg mice. In contrast, diabetic caPI3K mice were protected against diastolic dysfunction, pathological cardiomyocyte hypertrophy, fibrosis and apoptosis. Protection in diabetic caPI3K mice was associated with attenuation of left ventricular superoxide generation, attenuated Anp, Bnp, PKCβ2, Ask1 and p22 ( phox ) expression, and elevated AKT. Further, in cardiomyocyte-like cells, increased PI3K(p110α) activity suppressed high glucose-induced superoxide generation and enhanced mitochondrial function. CONCLUSIONS/INTERPRETATION These results demonstrate that reduced PI3K activity accelerates the development of diabetic cardiomyopathy, and that enhanced PI3K(p110α) activity can prevent adverse cardiac remodelling and dysfunction in a setting of diabetes.
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Affiliation(s)
- R H Ritchie
- Baker IDI Heart and Diabetes Institute, St Kilda Rd Central, Melbourne, VIC 8008, Australia.
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Affiliation(s)
- Mahmood Araï
- Department of Economics and SULCIS; Stockholm University
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Huynh K, Kiriazis H, Du XJ, Love JE, Jandeleit-Dahm KA, Forbes JM, McMullen JR, Ritchie RH. Coenzyme Q10 attenuates diastolic dysfunction, cardiomyocyte hypertrophy and cardiac fibrosis in the db/db mouse model of type 2 diabetes. Diabetologia 2012; 55:1544-53. [PMID: 22374176 DOI: 10.1007/s00125-012-2495-3] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2011] [Accepted: 01/16/2012] [Indexed: 01/02/2023]
Abstract
AIMS/HYPOTHESIS An increase in the production of reactive oxygen species is commonly thought to contribute to the development of diabetic cardiomyopathy. This study aimed to assess whether administration of the antioxidant coenzyme Q(10) would protect the diabetic heart against dysfunction and remodelling, using the db/db mouse model of type 2 diabetes. Furthermore, we aimed to compare the efficacy of coenzyme Q(10) to that of the ACE inhibitor ramipril. METHODS Six-week-old non-diabetic db/+ mice and diabetic db/db mice received either normal drinking water or water supplemented with coenzyme Q(10) for 10 weeks. Endpoint cardiac function was assessed by echocardiography and catheterisation. Ventricular tissue was collected for histology, gene expression and protein analysis. RESULTS Untreated db/db diabetic mice exhibited hyperglycaemia, accompanied by diastolic dysfunction and adverse structural remodelling, including cardiomyocyte hypertrophy, myocardial fibrosis and increased apoptosis. Systemic lipid peroxidation and myocardial superoxide generation were also elevated in db/db mice. Coenzyme Q(10) and ramipril treatment reduced superoxide generation, ameliorated diastolic dysfunction and reduced cardiomyocyte hypertrophy and fibrosis in db/db mice. Phosphorylation of Akt, although depressed in untreated db/db mice, was restored with coenzyme Q(10) administration. We postulate that preservation of cardioprotective Akt signalling may be a mechanism by which coenzyme Q(10)-treated db/db mice are protected from pathological cardiac hypertrophy. CONCLUSIONS/INTERPRETATION These data demonstrate that coenzyme Q(10) attenuates oxidative stress and left ventricular diastolic dysfunction and remodelling in the diabetic heart. Addition of coenzyme Q(10) to the current therapy used in diabetic patients with diastolic dysfunction warrants further investigation.
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Affiliation(s)
- K Huynh
- Baker IDI Heart and Diabetes Institute, PO Box 6492, St Kilda Road Central, Melbourne, Victoria 8008, Australia
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Assmann A, Akhyari P, Delfs C, Horstkötter K, Huynh K, Stoldt V, Boeken U, Lichtenberg A. In vivo proof of persisting biofunctionalization of biological implants by fibronectin coating in a small animal model of aortic valve implantation. Thorac Cardiovasc Surg 2012. [DOI: 10.1055/s-0031-1297594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Wang G, Huynh K, Barhate R, Rodrigues W, Moore C, Coulter C, Vincent M, Soares J. Validation of a New Homogeneous Immunoassay for the Detection of Carisoprodol in Urine. J Anal Toxicol 2011; 35:108-12. [DOI: 10.1093/anatox/35.2.108] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Cheng CS, Feldman KE, Lee J, Verma S, Huang DB, Huynh K, Chang M, Ponomarenko JV, Sun SC, Benedict CA, Ghosh G, Hoffmann A. The specificity of innate immune responses is enforced by repression of interferon response elements by NF-κB p50. Sci Signal 2011; 4:ra11. [PMID: 21343618 DOI: 10.1126/scisignal.2001501] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The specific binding of transcription factors to cognate sequence elements is thought to be critical for the generation of specific gene expression programs. Members of the nuclear factor κB (NF-κB) and interferon (IFN) regulatory factor (IRF) transcription factor families bind to the κB site and the IFN response element (IRE), respectively, of target genes, and they are activated in macrophages after exposure to pathogens. However, how these factors produce pathogen-specific inflammatory and immune responses remains poorly understood. Combining top-down and bottom-up systems biology approaches, we have identified the NF-κB p50 homodimer as a regulator of IRF responses. Unbiased genome-wide expression and biochemical and structural analyses revealed that the p50 homodimer repressed a subset of IFN-inducible genes through a previously uncharacterized subclass of guanine-rich IRE (G-IRE) sequences. Mathematical modeling predicted that the p50 homodimer might enforce the stimulus specificity of composite promoters. Indeed, the production of the antiviral regulator IFN-β was rendered stimulus-specific by the binding of the p50 homodimer to the G-IRE-containing IFNβ enhancer to suppress cytotoxic IFN signaling. Specifically, a deficiency in p50 resulted in the inappropriate production of IFN-β in response to bacterial DNA sensed by Toll-like receptor 9. This role for the NF-κB p50 homodimer in enforcing the specificity of the cellular response to pathogens by binding to a subset of IRE sequences alters our understanding of how the NF-κB and IRF signaling systems cooperate to regulate antimicrobial immunity.
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Affiliation(s)
- Christine S Cheng
- Signaling Systems Laboratory, University of California-San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
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Ritchie R, Khammy M, Bowden M, Irvine J, Andrews K, Huynh K, Kiriazis H, Kaye D, Venardos K. Diabetes-Induced Cardiac Dysfunction is Rescued by Endothelial Cationic Amino Acid Transporter 1 (CAT-1) Overexpression in Mice. Heart Lung Circ 2011. [DOI: 10.1016/j.hlc.2011.05.159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Ritchie R, Love J, Kiriazis H, Huynh K, Cemerlang N, Tan J, Julius T, Jennings N, Jandeleit-Dahm K, Du X, McMullen J. Cardiac-Specific Activation of Phosphoinositide 3-Kinase p110á (PI3Ká) Protects Against Diabetes-Induced Diastolic Dysfunction In Vivo: Role for ROS Suppression? Heart Lung Circ 2010. [DOI: 10.1016/j.hlc.2010.06.761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Huynh K, Kiriazis H, Du X, Jandeleit-Dahm K, Bowden M, Forbes J, McMullen J, Ritchie R. Coenzyme Q10 Inhibits Cardiomyocyte Hypertrophy, Myocardial Fibrosis and Diastolic Dysfunction in a Mouse Model of Type 2 Diabetes. Heart Lung Circ 2010. [DOI: 10.1016/j.hlc.2010.06.683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Huynh K, Wang G, Moore C, Barhate R, Coulter C, Rodrigues W, Catbagan P, Soares J. Development of a homogeneous immunoassay for the detection of zolpidem in urine. J Anal Toxicol 2009; 33:486-90. [PMID: 19874657 DOI: 10.1093/jat/33.8.486] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Sleep disorders are common conditions that affect about 40 million people in the U.S every year, the most common of which is insomnia, which is characterized by difficulty falling or staying asleep. Zolpidem (Ambien) is a non-benzodiazepine prescription drug that is used to treat insomnia and is often preferred over the commonly used benzodiazepines due to a lesser side effect profile. This is because the non-benzodiazepine binding is more selective to GABA-A receptors versus the non-selective binding of benzodiazepines. With the increasing popularity of non-benzodiazepines, drug abuse and driving-while-impaired cases involving sleep-inducing drugs have risen. Therefore, a highly sensitive and rapid homogeneous immunoassay (EMIT-type assay) has been developed for the detection of zolpidem in urine. The zolpidem antibody is highly specific and does not cross-react with other newer sleep aids such as zopiclone and zaleplon. This assay has a detection limit of 5 ng/mL for zolpidem in urine. Further evaluation of this assay using liquid chromatography-tandem mass spectrometry (LC-MS-MS) analysis of authentic urine samples demonstrated that the accuracy of the assay is greater than 90%. Because this assay is designed to measure the non-conjugated drug in urine, it resulted in simplification for gas chromatography-MS or LC-MS-MS confirmation methods that do not require urine hydrolysis before solid-phase extraction or liquid-liquid extraction.
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Affiliation(s)
- Kim Huynh
- Immunalysis Corporation, Pomona, California 91767, USA
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Abstract
This paper investigates the production of research in business and economics. A scholar's reward is positively related to the quantity and quality of research. In turn, the quality of a paper depends on the scholar's ability to internalize new ideas and the overall quality of external research. The individual scholar is subject to a trade-off between writing more papers or reading in order to take in new ideas. In the Nash symmetric equilibrium, the quantity and quality of published papers are jointly determined. Under reasonable assumptions about the research production process, in equilibrium researchers write too many papers of too low a quality compared to the cooperative outcome. The model sheds some light on the effectiveness of various research policies currently under review by European policymakers.
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Pask AJ, Huynh K, Renfree MB. ATRX and ATRY in the Mammalian Gonad. Biol Reprod 2008. [DOI: 10.1093/biolreprod/78.s1.306a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Drew D, Shimada E, Huynh K, Bergqvist S, Talwar R, Karin M, Ghosh G. Inhibitor κB Kinase β Binding by Inhibitor κB Kinase γ. Biochemistry 2007; 46:12482-90. [DOI: 10.1021/bi701137a] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Devin Drew
- Departments of Chemistry & Biochemistry and of Pharmacology, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093
| | - Eriko Shimada
- Departments of Chemistry & Biochemistry and of Pharmacology, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093
| | - Kim Huynh
- Departments of Chemistry & Biochemistry and of Pharmacology, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093
| | - Simon Bergqvist
- Departments of Chemistry & Biochemistry and of Pharmacology, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093
| | - Rashmi Talwar
- Departments of Chemistry & Biochemistry and of Pharmacology, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093
| | - Michael Karin
- Departments of Chemistry & Biochemistry and of Pharmacology, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093
| | - Gourisankar Ghosh
- Departments of Chemistry & Biochemistry and of Pharmacology, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093
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Garsden H, Basilakis J, Celler BG, Huynh K, Lovell NH. A home health monitoring system including intelligent reporting and alerts. Conf Proc IEEE Eng Med Biol Soc 2007; 2004:3151-4. [PMID: 17270948 DOI: 10.1109/iembs.2004.1403889] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
We describe the design and implementation of an intelligent reporting and alerts system that has been designed with a specific goal to address the needs of managing chronic and complex disease through the use of home telecare technology. Our approach has been to develop these tools using as far as possible, open standards. Clinical measurement data gathered using home telecare and stored in a relational database in XML format is extracted and converted into a Clinical Document Architecture (CDA) as defined by the Health Level 7 (HL7) organization. Data trends are presented to the clinician as simple graphs and summary statistics (means, standard deviations) over time for an individual patient. Clinicians may receive this data by display through a Web-interface or by email or faxed reports. A Ripple Down Rules (RDR) knowledge base supports more complex decision-making provided in the Alerts module. The RDR output is incorporated into the output reports as a textual statement, and/or a graphical highlighting of key parameters in the trends images and tables. Rule development and validation is part of ongoing research.
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Affiliation(s)
- H Garsden
- School of Electrical Engineering, University of New South Wales, Sydney, Australia
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Sakurai R, Wang Y, Santos J, Huynh K, Torday J, Rehan V. Reversal of Alveolar Interstitial Fibroblast to Myofibroblast Transdifferentiation by Stimulants of Parathyroid Hormone-Related Protein-Mediated Cyclic Adenosine Monophosphate–Dependent Protein Kinase a Signaling Pathway. J Investig Med 2006. [DOI: 10.1177/108155890605401s72] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- R. Sakurai
- Los Angeles BioMedical Research Institute, Los Angeles, CA
| | - Y. Wang
- Los Angeles BioMedical Research Institute, Los Angeles, CA
| | - J. Santos
- Los Angeles BioMedical Research Institute, Los Angeles, CA
| | - K. Huynh
- Los Angeles BioMedical Research Institute, Los Angeles, CA
| | - J.S. Torday
- Los Angeles BioMedical Research Institute, Los Angeles, CA
| | - V.K. Rehan
- Los Angeles BioMedical Research Institute, Los Angeles, CA
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Sakurai R, Wang Y, Santos J, Huynh K, Torday JS, Rehan VK. 189 REVERSAL OF ALVEOLAR INTERSTITIAL FIBROBLAST TO MYOFIBROBLAST TRANSDIFFERENTIATION BY STIMULANTS OF PARATHYROID HORMONE-RELATED PROTEIN-MEDIATED CYCLIC ADENOSINE MONOPHOSPHATE-DEPENDENT PROTEIN KINASE A SIGNALING PATHWAY. J Investig Med 2006. [DOI: 10.2310/6650.2005.x0004.188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Park DJ, Pask AJ, Huynh K, Harley VR, Renfree MB, Graves JAM. Characterisation of the marsupial-specific ATRY gene: Implications for the evolution of male-specific function. Gene 2005; 362:29-36. [PMID: 16209912 DOI: 10.1016/j.gene.2005.08.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2005] [Revised: 07/19/2005] [Accepted: 08/01/2005] [Indexed: 11/30/2022]
Abstract
Many or most genes on the mammal Y chromosome evolved a testis-specific function after diverging from an X-borne copy with a general function in both sexes. In marsupial but not eutherian mammals, a testis-specific orthologue (ATRY) of the widely expressed X-borne ATRX gene lies on the Y chromosome. Since mutations in human ATRX cause sex reversal, it is possible that one function of ATRY in marsupials is testicular differentiation. We report here the isolation and sequencing of the tammar wallaby (Macropus eugenii) ATRY cDNA, and comparison of its sequence with that of tammar ATRX. The evolution of a testis-specific function for the ATRY protein distinct from the general role of ATRX in both sexes has been accompanied by sequence changes in many protein domains that would alter protein binding partners. A large open reading frame encodes a 1771 amino acid ATRY protein that has diverged extensively from ATRX. The conservation and loss of particular motifs identify those required for testicular function (ATRY) and function in other tissues (ATRX).
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Affiliation(s)
- Daniel J Park
- Department of Zoology, The University of Melbourne, Melbourne Vic. 3010, Australia.
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Park DJ, Pask AJ, Huynh K, Renfree MB, Harley VR, Graves JAM. Comparative analysis of ATRX, a chromatin remodeling protein. Gene 2004; 339:39-48. [PMID: 15363844 DOI: 10.1016/j.gene.2004.06.025] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2004] [Revised: 04/08/2004] [Accepted: 06/10/2004] [Indexed: 10/26/2022]
Abstract
The ATRX protein, associated with X-linked alpha-thalassaemia, mental retardation and developmental abnormalities including genital dysgenesis, has been proposed to function as a global transcriptional regulator within a multi-protein complex. However, an understanding of the composition and mechanics of this machinery has remained elusive. We applied inter-specific comparative analysis to identify conserved elements which may be involved in regulating the conformation of chromatin. As part of this study, we cloned and sequenced the entire translatable coding region (7.4 kb) of the ATRX gene from a model marsupial (tammar wallaby, Macropus eugenii). We identify an ATRX ancestral core, conserved between plants, fish and mammals, comprising the cysteine-rich and SWI2/SNF2 helicase-like regions and protein interaction domains. Our data are consistent with the model of the cysteine-rich region as a DNA-binding zinc finger adjacent to a protein-binding (plant homeodomain-like) domain. Alignment of vertebrate ATRX sequences highlights other conserved elements, including a negatively charged mammalian sequence which we propose to be involved in binding of positively charged histone tails.
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Affiliation(s)
- Daniel J Park
- Department of Zoology, The University of Melbourne, Gate 12 Royal Parade, Melbourne 3010, Australia.
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Carvalho-Silva DR, O'Neill RJW, Brown JD, Huynh K, Waters PD, Pask AJ, Delbridge ML, Graves JAM. Molecular characterization and evolution of X and Y-borne ATRX homologues in American marsupials. Chromosome Res 2004; 12:795-804. [PMID: 15702418 DOI: 10.1007/s10577-005-5376-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2004] [Accepted: 09/25/2004] [Indexed: 12/01/2022]
Abstract
In eutherians, the sex-reversing ATRX gene on the X has no homologue on the Y chromosome. However, testis-specific and ubiquitously expressed X-borne genes have been identified in Australian marsupials. We studied nucleotide sequence and chromosomal location of ATRX homologues in two American marsupials, the opossums Didelphis virginiana and Monodelphis domestica. A PCR fragment of M. domestica ATRX was used to probe Southern blots and to screen male genomic libraries. Southern analysis demonstrated ATRX homologues on both X and Y in D. virginiana, and two clones were isolated which hybridized to a single position on the Y chromosome in male-derived cells but to multiple sites of the X in female cells. In M. domestica, there was a single clone that mapped to the X but not to the Y, suggesting that it represents the M. domestica ATRX. However a male-specific band was detected in Southern blots probed with the D. virginiana ATRY and with a mouse ATRX clone, which implies that the Y copy in M. domestica has diverged further from other ATRX homologues. Thus there appears to be a Y-borne copy of ATRY in American, as well as Australian marsupials, although it has diverged in sequence, as have other Y genes that are testis-specific in both eutherian and marsupial lineages.
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Affiliation(s)
- Denise R Carvalho-Silva
- Research School of Biological Science, Australian National University, ACT 0200, Canberra, Australia.
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Huynh K. Modernity and My Mum: A Literary Exploration into the (Extra)Ordinary Sacrifices and Everyday Resistance of a Vietnamese Woman. Frontiers: A Journal of Women Studies 2004. [DOI: 10.1353/fro.2004.0051] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Abstract
Oocyte maturation and ovulation require a coordinated interaction between gonadotrophs, steroid hormones, and growth factors. The extent to which estrogen is required in this process, however, remains unclear. To better understand the role of estrogen in maintaining developmental competence of mammalian oocytes, we studied the Aromatase knockout (ArKO) mouse, which has been genetically engineered to be incapable of synthesizing endogenous estrogen. Previous studies have established that ArKO female mice are anovulatory with ovaries that progressively degenerate, developing hemorrhagic cystic follicles. In young ArKO females, however, apparently healthy follicles and oocytes have been observed. We investigated if these oocytes could be induced to ovulate, then mature, fertilize, and develop in vitro. Following a standard superovulation protocol, ArKO oocytes did not ovulate. When recovered manually from the ovary, however, ArKO oocytes successfully progressed through in vitro maturation, fertilization, and development to the blastocyst stage at the same rate as wild-type and heterozygote littermates. Therefore, it appears that estrogen is not required for the production and growth of oocytes capable of maturation and complete preimplantation development but is required for continued follicle growth and feedback regulation of ovulation.
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Affiliation(s)
- Kim Huynh
- Department of Anatomy, Monash University, Clayton, Victoria 3800, Australia
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Pask A, Park D, Huynh K, Higgs D, Gibbons R, Graves JM, Renfree MB. 102. Cloning and characterisation of tammar ATRX and ATRY. Reprod Fertil Dev 2003. [DOI: 10.1071/srb03ab102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Lovell NH, Magrabi F, Celler BG, Huynh K, Garsden H. Web-based acquisition, storage, and retrieval of biomedical signals. IEEE Eng Med Biol Mag 2001; 20:38-44. [PMID: 11446208 DOI: 10.1109/51.932723] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- N H Lovell
- Graduate School of Biomedical Engineering, University of New South Wales, Sydney.
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Miyashiro I, Kuo C, Huynh K, Iida A, Morton D, Bilchik A, Giuliano A, Hoon DS. Molecular strategy for detecting metastatic cancers with use of multiple tumor-specific MAGE-A genes. Clin Chem 2001; 47:505-12. [PMID: 11238304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
BACKGROUND The human melanoma-associated antigen family A (MAGE-A) has high specificity and expression in various malignancies, but individual family members are expressed at low frequency in any one particular type of cancer. We therefore developed a method to detect mRNAs from multiple MAGE-A genes in a single reaction. METHODS Universal MAGE-A (uMAGE-A) primers and probe were designed to reverse-transcribe, amplify, and detect by electrochemiluminescence (ECL) MAGE-A mRNAs on the Origen Analyzer. The assay was performed on total RNA of melanoma (n = 9 cell lines and 24 tumors), breast cancer (n = 7 and 26), and colorectal cancer (CRC; n = 5 and 12). We also evaluated blood from melanoma (n = 50), breast cancer (n = 16), and CRC (n = 21) patients. RESULTS The uMAGE-A mRNA was detectable in 0.01-1 ng of cell line RNA. The identity of the uMAGE-A cDNA products was confirmed by sequencing and polyacrylamide gel electrophoresis. The uMAGE-A assay increased detection of melanoma, breast cancer, and CRC tumor by 13%, 31%, and 25%, respectively, compared with a MAGE-A1 assay, and by 17%, 19%, and 25%, respectively, compared with a MAGE-A3 assay. The uMAGE-A assay detected circulating tumor cells in the blood of melanoma (24%), breast cancer (25%), and CRC (29%) patients. CONCLUSIONS The uMAGE-A reverse transcription-PCR/ECL assay provides a practical and sensitive approach for detection of various metastatic cancers in tissues and blood.
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Affiliation(s)
- I Miyashiro
- Department of Molecular Oncology, John Wayne Cancer Clinic, Division Gastrointestinal Surgery, and Joyce Eisenberg Keefer Breast Center, John Wayne Cancer Institute, Santa Monica, CA 90404, USA
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Affiliation(s)
- F Cesani
- University of Texas Medical Branch, Galveston 77555-0793, USA
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