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1.
BMC Med ; 22(1): 7, 2024 01 03.
Article in English | MEDLINE | ID: mdl-38166923

ABSTRACT

The devastating impact of youth mental health concerns is increasingly evident on a global scale. This crisis calls for innovative solutions that are sufficiently accessible, scalable, and cost-effective to support diverse communities around the world. One such solution involves engagement in the arts: incorporating and building upon existing local resources and cultural practices to bolster youth mental health. In this article, we describe the global youth mental health crisis and note major gaps in the knowledge and resources needed to address it. We then discuss the potential for arts- and culture-based strategies to help meet this challenge, review the mounting evidence regarding art's ability to support mental health, and call for action to undertake critical research and its translation into accessible community practices. Four steps are suggested: (1) elevate and prioritize youth voice, (2) develop core outcome measures, (3) identify and analyze successful models around the globe, and (4) generate clear funding pathways for research and translational efforts. Worldwide implementation of arts- and culture-based strategies to address youth mental health will provide critical resources to support the health, wellbeing and flourishing of countless youth across the globe.


Subject(s)
Art , Mental Health , Adolescent , Humans , Adolescent Health
2.
J Vet Diagn Invest ; 34(4): 631-637, 2022 Jul.
Article in English | MEDLINE | ID: mdl-35593583

ABSTRACT

Tetratrichomonas gallinarum and Trichomonas gallinae are pathogenic avian parasites that infect a wide range of bird species. The pathologic potential of T. gallinarum is controversial, whereas T. gallinae causes disease in many avian species. Infections are often asymptomatic in doves and pigeons; thus, columbids are presumed to represent the natural hosts for trichomonads. The detection of T. gallinarum and T. gallinae is based on direct microscopic observation or a conventional PCR assay. Microscopy is not very sensitive, and identification of the trichomonads at the genus or species level is not possible. Conventional PCR assays have been developed primarily for phylogenetic studies, which detect a wide range of Trichomonas spp. but do not allow their differentiation. We developed a duplex real-time PCR (rtPCR) assay for the simultaneous detection and differentiation of T. gallinarum and T. gallinae. We found that the rtPCR assay detected 102 plasmid DNA copies of T. gallinarum and as few as 101 plasmid DNA copies of T. gallinae.


Subject(s)
Bird Diseases , Trichomonadida , Trichomonas , Animals , Bird Diseases/diagnosis , Bird Diseases/parasitology , Columbidae , DNA , Phylogeny , Real-Time Polymerase Chain Reaction/veterinary , Trichomonadida/genetics , Trichomonas/genetics
3.
Front Public Health ; 10: 1016136, 2022.
Article in English | MEDLINE | ID: mdl-36743160

ABSTRACT

Introduction: As the field of public health strives to address the impacts of social determinants of health, it has seen increasing interest in community-referral practices that expand health care beyond clinical spaces. However, community arts and culture organizations are rarely included in these practices, despite accumulating evidence of associated health benefits. In addition, such inclusion has not been formally studied. In response, this article offers an evaluation of "CultureRx" in Massachusetts (MA): the first US model of arts on prescription. The program is a partnership between 20 healthcare providers and 12 cultural organizations, in which providers can offer "prescriptions" to cultural experiences to support patients' health. Methods: Evaluation was undertaken to illuminate participant experiences, program successes and barriers, and recommendations for further development. The cultural organizations collected participant data (n = 84) and completed surveys about their own experiences (n = 12). Authors conducted semi-structured focus groups and interviews with healthcare providers (n = 33). Data analysis was customized for each dataset. Results: Findings indicate that participants enjoyed and hoped to repeat their prescribed experiences, which they saw as beneficial to wellbeing. Providers identified the program as a new and critical addition to their toolkits; they also indicated it had a positive effect on their own wellbeing. Cultural organizations reported varied challenges, learnings, and recommendations. Conclusion: The CultureRx pilot suggests that integrating arts/culture assets into health and social care approaches can enrich and improve traditional US models of community referral. By including arts/culture resources when addressing social determinants of health, communities will be better positioned to equitably and holistically advance health.


Subject(s)
Delivery of Health Care , Social Support , Humans , Pilot Projects , Focus Groups , Massachusetts
4.
J Curr Glaucoma Pract ; 15(2): 78-85, 2021.
Article in English | MEDLINE | ID: mdl-34720497

ABSTRACT

AIM AND OBJECTIVE: To establish the association between 12-month inter-visits ocular perfusion pressure (OPP) and severity of glaucoma. MATERIALS AND METHODS: A total of 164 eyes (60 primary open-angle glaucoma, 52 normal-tension glaucoma, and 52 primary angle-closure glaucoma) of 164 patients were analyzed in this prospective cohort study. Patients who demonstrated good compliance to treatment were recruited. The severity of glaucoma was stratified according to the Advanced Glaucoma Intervention Study (AGIS) score based on reliable and reproducible visual field analysis at baseline. OPP was obtained at baseline and a 3-monthly follow-up visit over a 12-month duration. The pattern and fluctuation of mean OPP were studied. Repetitive measure ANOVA and one-way ANOVA were used for statistical analysis. RESULTS: The inter-visits mean OPP (p = 0.010), systolic OPP (p = 0.020), diastolic OPP (p = 0.010), systolic blood pressure (p = 0.040), and diastolic blood pressure (p = 0.006) showed significant difference with severity of glaucoma. There was no significant difference between mean inter-visits intraocular pressure (IOP) and severity of glaucoma (p = 0.410). The end-stage glaucoma group had the lowest mean OPP and widest inter-visit mean OPP fluctuation. Early and mild glaucoma patients demonstrated higher mean OPP compared with moderate, severe, and end-stage glaucoma. CONCLUSION: There is a significant association between OPP and the severity of glaucoma. Balancing blood pressure and IOP is important in optimizing adequate perfusion and prevent further damage to the optic nerve head. HOW TO CITE THIS ARTICLE: Ch'ng TW, Chua CY, Ummi Kalsom MA, et al. Ocular Perfusion Pressure and Severity of Glaucoma: Is There a Link? J Curr Glaucoma Pract 2021;15(2):78-85.

5.
Indoor Air ; 28(2): 258-265, 2018 03.
Article in English | MEDLINE | ID: mdl-29130534

ABSTRACT

One of the most notable Indoor Air Quality problems is odor emission. This study investigated the potential contribution of skin squames to the production of ammonia (NH3 ) and volatile organic acids (VFAs) by 7 bacteria isolated from air-cooling (AC) units with complaints of urine and body odors. Our previous study showed that keratinolytic activity is higher in AC units with odor complaints than those without. In the offices where these units are located, the most likely source of keratins is from human skin squames. Most bacteria can produce NH3 and VFAs in the skin squame culture. Some correlations between the levels of NH3 , NH4+, VFAs, and keratinolytic activity were found. The odor production pathway with skin squames was proposed. Staphylococcus haemolyticus was abundant in the AC units with odor problems and had a high level of keratinolytic activity in addition to odor production. For long-term odor control, it is important to reduce the level of skin squames entering the AC units.


Subject(s)
Air Conditioning , Air Pollutants/analysis , Ammonia/analysis , Fatty Acids, Volatile/analysis , Odorants/analysis , Skin/chemistry , Colony Count, Microbial , Environmental Monitoring , Humans , Skin/microbiology , Staphylococcus haemolyticus/growth & development
6.
Am J Transplant ; 15(5): 1231-40, 2015 May.
Article in English | MEDLINE | ID: mdl-25676865

ABSTRACT

Vascularized composite allotransplantation (VCA) has emerged as a treatment option for treating nonlife-threatening conditions. Therefore, in order to make VCA a safe reconstruction option, there is a need to minimize immunosuppression, develop tolerance-inducing strategies and elucidate the mechanisms of VCA rejection and tolerance. In this study we explored the effects of hIL-2/Fc (a long-lasting human IL-2 fusion protein), in combination with antilymphocyte serum (ALS) and short-term cyclosporine A (CsA), on graft survival, regulatory T cell (Treg) proliferation and tolerance induction in a rat hind-limb transplant model. We demonstrate that hIL-2/Fc therapy tips the immune balance, increasing Treg proliferation and suppressing effector T cells, and permits VCA tolerance as demonstrated by long-term allograft survival and donor-antigen acceptance. Moreover, we observe two distinct types of acute rejection (AR), progressive and reversible, within hIL-2/Fc plus ALS and CsA treated recipients. Our study shows differential gene expression profiles of FoxP3 versus GzmB, Prf1 or interferon-γ in these two types of AR, with reversible rejection demonstrating higher Treg to Teff gene expression. This correlation of gene expression profile at the first clinical sign of AR with VCA outcomes can provide the basis for further inquiry into the mechanistic aspects of VCA rejection and future drug targets.


Subject(s)
Hindlimb/transplantation , Interleukin-2/chemistry , Recombinant Fusion Proteins/chemistry , Transplantation Tolerance/drug effects , Vascularized Composite Allotransplantation/methods , Animals , Cell Proliferation , Cyclosporine/chemistry , Forkhead Transcription Factors/metabolism , Gene Expression Regulation , Graft Rejection , Graft Survival , Granzymes/metabolism , Humans , Immune System , Immune Tolerance , Male , Pore Forming Cytotoxic Proteins/metabolism , Rats , Rats, Inbred Lew , Rats, Wistar , Transplantation, Homologous
7.
Br J Cancer ; 111(10): 1945-54, 2014 Nov 11.
Article in English | MEDLINE | ID: mdl-25314062

ABSTRACT

BACKGROUND: Immune suppression in the tumour microenvironment remains a major limitation to successful immunotherapy of cancer. In the current study, we analysed whether the natural killer T cell-activating glycolipid α-galactosylceramide could overcome immune suppression and improve vaccination against metastatic breast cancer. METHODS: Mice with metastatic breast cancer (4T1 model) were therapeutically treated with a Listeria monocytogenes-based vaccine expressing tumour-associated antigen Mage-b followed by α-galactosylceramide as separate agents, or as a complex of α-galactosylceramide stably incorporated into Listeria-Mage-b. Effects on metastases, tumour weight, toxicity and immune responses were determined. RESULTS: Sequential treatments of mice with established 4T1 breast carcinomas using Listeria-Mage-b followed by α-galactosylceramide as a separate agent was highly effective at reducing metastases, but was accompanied by severe liver toxicity. In contrast, combined therapy using Listeria-Mage-b modified by incorporation of α-galactosylceramide resulted in nearly complete elimination of metastases without toxicity. This was associated with a significant increase in the percentage of natural killer T cells in the spleen, and an increase in natural killer cell activity and in T cell responses to Mage-b. CONCLUSIONS: Our results suggest that direct incorporation of α-galactosylceramide into a live bacterial vaccine vector is a promising non-toxic new approach for the treatment of metastatic breast cancer.


Subject(s)
Cancer Vaccines/therapeutic use , Galactosylceramides/metabolism , Immunotherapy , Killer Cells, Natural/immunology , Listeria monocytogenes/genetics , Mammary Neoplasms, Experimental/prevention & control , Neoplasm Proteins/genetics , T-Lymphocytes/immunology , Animals , Antigens, Neoplasm/immunology , Apoptosis , Blotting, Western , Cell Adhesion , Cell Cycle , Cell Movement , Cell Proliferation , Female , Flow Cytometry , Immunoenzyme Techniques , Killer Cells, Natural/metabolism , Killer Cells, Natural/pathology , Lymphocyte Activation , Mammary Neoplasms, Experimental/genetics , Mammary Neoplasms, Experimental/immunology , Mammary Neoplasms, Experimental/pathology , Mice , Mice, Inbred BALB C , Mice, Nude , Neoplasm Metastasis , RNA, Messenger/genetics , Real-Time Polymerase Chain Reaction , Recombination, Genetic , Reverse Transcriptase Polymerase Chain Reaction , T-Lymphocytes/metabolism , T-Lymphocytes/pathology , Tumor Cells, Cultured , Vaccination
8.
Diabetes Obes Metab ; 16(6): 519-26, 2014 Jun.
Article in English | MEDLINE | ID: mdl-24299019

ABSTRACT

AIM: To test the effect of atorvastatin (ATV) and ATV plus ω-3 FAEEs on VLDL-TG metabolism in obese, insulin resistant men. METHODS: We carried out a 6-week randomized, placebo-controlled study to examine the effect of ATV (40 mg/day) and ATV plus ω-3 FAEEs (4 g/day) on VLDL-TG metabolism in 36 insulin resistant obese men. VLDL-TG kinetics were determined using d5 -glycerol, gas chromatography-mass spectrometry and compartmental modelling. RESULTS: Compared with the placebo, ATV significantly decreased VLDL-TG concentration (-40%, p < 0.001) by increasing VLDL-TG fractional catabolic rate (FCR) (+47%, p < 0.01). ATV plus ω-3 FAEEs lowered VLDL-TG concentration to a greater degree compared with placebo (-46%, p < 0.001) or ATV monotherapy (-13%, p = 0.04). This was achieved by a reduction in VLDL-TG production rate (PR) compared with placebo (-32%, p = 0.008) or ATV (-20%, p = 0.03) as well as a reciprocal increase in VLDL-TG FCR (+42%, p < 0.05) compared with placebo. CONCLUSION: In insulin resistant, dyslipidaemic, obese men, ATV improves VLDL-TG metabolism by increasing VLDL-TG FCR. The addition of 4 g/day ω-3 FAEE to statin therapy provides further TG-lowering by lowering VLDL-TG PR.


Subject(s)
Docosahexaenoic Acids/administration & dosage , Eicosapentaenoic Acid/administration & dosage , Heptanoic Acids/administration & dosage , Insulin Resistance , Lipoproteins, VLDL/blood , Obesity/drug therapy , Pyrroles/administration & dosage , Triglycerides/blood , Anticholesteremic Agents/administration & dosage , Apolipoprotein B-100/blood , Atorvastatin , Drug Combinations , Drug Therapy, Combination , Dyslipidemias/drug therapy , Dyslipidemias/metabolism , Humans , Male , Middle Aged , Obesity/metabolism , Treatment Outcome
9.
Am J Transplant ; 13(8): 2161-8, 2013 Aug.
Article in English | MEDLINE | ID: mdl-23718897

ABSTRACT

Vascularized composite allografts (VCAs) are unique among transplanted organs in that they are composed of multiple tissues with disparate antigenic and immunologic properties. As the predominant indications for VCAs are non-life-threatening conditions, there is an immediate need to develop tolerance induction strategies and to elucidate the mechanisms of VCA rejection and tolerance using VCA-specific animal models. In this study, we explore the effects of in vitro induced donor antigen-specific CD4(-) CD8(-) double negative (DN) Treg-based therapy, in a fully MHC mismatched mouse VCA such as a vascularized osteomyocutaneous as compared to a non-VCA such as a full thickness skin (FTS) transplantation model to elucidate the unique features of VCA rejection and tolerance. We demonstrate that combined therapy with antigen-induced CD4 derived DN Tregs and a short course of anti-lymphocyte serum, rapamycin and IL-2/Fc fusion protein results in donor-specific tolerance to VCA, but not FTS allografts. Macrochimerism was detected in VCA but not FTS allograft recipients up to >60 days after transplantation. Moreover, a significant increase of CD4(+) Foxp3(+) Tregs was found in the peripheral blood of tolerant VCA recipients. These data suggest that VCA are permissive to tolerance induced by DN Treg-based induction therapy.


Subject(s)
Bone Transplantation/immunology , Graft Survival/immunology , Immunomodulation , Muscle, Skeletal/transplantation , Skin Transplantation/immunology , T-Lymphocytes, Regulatory/immunology , Transplantation Tolerance , Animals , CD4 Antigens/metabolism , Cell Proliferation , Flow Cytometry , Graft Rejection/immunology , Interleukin-2/pharmacology , Male , Mice , Mice, Inbred C3H , Mice, Inbred C57BL , Mice, Inbred DBA , Transplantation Chimera , Transplantation Conditioning , Transplantation, Homologous
10.
Med J Malaysia ; 68(5): 410-4, 2013 Oct.
Article in English | MEDLINE | ID: mdl-24632871

ABSTRACT

INTRODUCTION: Acute angle closure (AAC) without prompt treatment may lead to optic neuropathy. Environmental factor such as climate change may precipitate pupillary block, the possible mechanism of AAC. OBJECTIVE: To determine the association of northeast monsoon and incidence of AAC in Malaysia. MATERIALS AND METHODS: A retrospective study was conducted on AAC patients admitted to two main tertiary hospitals in Kelantan, Malaysia between January 2001 and December 2011. The cumulative number of rainy day, amount of rain, mean cloud cover and 24 hours mean humidity at the estimated day of attack were obtained from the Department of Meteorology, Malaysia. RESULTS: A total 73 cases of AAC were admitted with mean duration of 4.1SD 2.0 days. More than half have previous history of possibility of AAC. There was higher incidence of AAC during the northeast monsoon (October to March). There was also significant correlation of number of rainy day (r=0.718, p<0.001), amount of rain (r=0.587, p<0.001), cloud cover (r=0.637, p<0.001), mean daily global radiation (r=- 0.596, P<0.001), 24 hours mean temperature (r=-0.298, p=0.015) and 24 hours mean humidity (r=0.508, p<0.001) with cumulative number of admission for AAC for 12 calendar months. CONCLUSION: Higher incidence of AAC during northeast monsoon suggested the effect of climate as the potential risk factor. Prompt treatment to arrest pupillary block and reduction of the intraocular pressure is important to prevent potential glaucomatous damage. Public awareness of AAC and accessibility to treatment should be part of preparation to face the effect of northeast monsoon.

11.
J Nanosci Nanotechnol ; 12(6): 4560-3, 2012 Jun.
Article in English | MEDLINE | ID: mdl-22905500

ABSTRACT

Vertically-aligned ZnO nanorods (NRs) arrays were synthesized by a low-temperature solution method on boron-doped diamond (BDD) films. The morphology, growth direction, and crystallinity of the ZnO NRs were studied by scanning electron microscopy, X-ray diffraction and cathodoluminescence. Electrical characterization of the ZnO NR/BBD heterostructures revealed characteristic p-n junction properties with an on/off ratio of about 50 at +/- 4 V and a small reverse leakage current approximately 1 microA. Moreover, the junctions showed an ideality factor around 1.0 at a low forward voltage from 0 to 0.3 V and about 2.1 for an increased voltage ranging from 1.2 to 3.0 V, being consistent with that of an ideal diode according to the Sah-Noyce-Shockley theory.


Subject(s)
Diamond/chemistry , Nanostructures/chemistry , Nanostructures/ultrastructure , Semiconductors , Zinc Oxide/chemistry , Electric Conductivity , Equipment Design , Equipment Failure Analysis , Particle Size
12.
Diabetologia ; 54(8): 2082-92, 2011 Aug.
Article in English | MEDLINE | ID: mdl-21594554

ABSTRACT

AIMS/HYPOTHESIS: A new differentiation pathway for CD4(-)CD8(-) (DN) T cells has recently been identified that exhibits the potent function of peripheral converted DN T cells in suppressing immune responses and provides the potential to treat autoimmune diseases. The aim of this study was to determine if the DN T cells converted from CD4(+) T cells of NOD mice retain the antigen-specific regulatory capacity and prevent autoimmune diabetes in vivo. We also sought to determine if the combination of DN T cells with rapamycin promotes islet allograft survival in autoimmune diabetic NOD recipients. METHODS: NOD CD4(+) T cells were converted to DN T cells in an in vitro mixed-lymphocyte reaction, with or without GAD65 peptide, as previously reported. The antigen-specific DN T cells were adoptively transferred to NOD/SCID mice, new-onset diabetic NOD mice or islet-allograft-recipient NOD mice as the part of cell-based therapy. The development of diabetes and allograft survival was assessed by monitoring blood glucose levels. RESULTS: NOD CD4(+) T cells were converted in vitro to DN T cells at a rate of 50% and expressed unique cell features. The DN T cells from NOD donors blocked autoimmunity and prevented diabetes in NOD models, and these effects were even greater for GAD65-peptide-primed DN T cells. DN T cells acted in conjunction with rapamycin to suppress alloantigen-triggered T cell proliferation, promoted apoptosis and prolonged islet allograft survival in NOD recipients. CONCLUSIONS/INTERPRETATION: Administration of the islet beta cell antigen-specific DN T cells can prevent the development of autoimmune diabetes and promote islet allograft survival in NOD mice.


Subject(s)
CD4-Positive T-Lymphocytes/immunology , CD8-Positive T-Lymphocytes/immunology , Cell- and Tissue-Based Therapy/methods , Diabetes Mellitus, Type 1/prevention & control , Islets of Langerhans Transplantation/immunology , T-Lymphocytes, Regulatory/immunology , Animals , Cells, Cultured , Female , Flow Cytometry , Male , Mice , Mice, Inbred NOD , Polymerase Chain Reaction
13.
Biotech Histochem ; 86(2): 115-8, 2011 Apr.
Article in English | MEDLINE | ID: mdl-20163280

ABSTRACT

The ability to observe samples undergoing controlled fluid flow under the microscope is important for studying biochemical processes and motion dynamics. We describe here a simple method to achieve this using coverslips shaped using a fiber scribe. Testing showed good directional flow control within the test range of 0-1 ml/min flow rate and an ability to sustain a flow rate up to approximately 1 ml/min. Testing with a sealed T-channel coverslip demonstrated the ability to construct fluid network branches with this scheme. We also demonstrated the usefulness of this procedure in motion dynamic studies of Dunaliella algae swimming under fluid flow.


Subject(s)
Chlorophyta , Microscopy/instrumentation , Microscopy/methods , Chlorophyta/cytology , Chlorophyta/physiology , Kinetics , Models, Biological , Motion
14.
J Opt Soc Am A Opt Image Sci Vis ; 27(4): 757-65, 2010 Apr 01.
Article in English | MEDLINE | ID: mdl-20360818

ABSTRACT

Wannier functions derived from Bloch functions have been identified as an efficient means of analyzing the properties of photonic crystals in which localized functions have now opened the door for 2D and 3D structures containing defects to be investigated. In this paper, based on the Maxwell equations in diagonalized form and utilizing Bloch waves we have obtained an equivalent system of algebraic equations in eigenform. By establishing and exploiting several distinct properties of the resulting eigenpairs, we demonstrate an ability to construct Wannier functions associated with the simplest one-dimensional photonic structure. More importantly, the numerical investigation of the inner- and intra-band orthonormality conditions as well as Hilbert space partitioning features shows a capability for multi-resolution analysis that will make all-optical signal processing devices with photonic crystal structures feasible.

15.
Singapore Med J ; 49(10): 765-73, 2008 Oct.
Article in English | MEDLINE | ID: mdl-18946608

ABSTRACT

INTRODUCTION: In our Asian society, respect for our elderly is deeply entrenched and highly valued. However, a previous study had shown that physical mistreatment of the elderly exists in the local population. This present descriptive study aims to evaluate the other types of elderly mistreatment and epidemiology of suspected victims in the local population. METHODS: Over a period of 12 months, from June 2005 to May 2006, doctors of the Emergency Department (ED) were trained to look for clinical features of mistreatment in patients aged 65 years and above. A specially-developed evaluation form was used to help the staff in assessing suspected cases; these were then referred to medical social workers for further evaluation. RESULTS: 42 cases of suspected mistreatment were detected, with almost three times more female than male patients. The average age of suspected victims was 78.8 years. There were 27 cases of possible physical mistreatment, 25 of possible neglect, six of possible psychological mistreatment, two of possible financial mistreatment, one of possible abandonment and one of possible self-neglect. Most suspected perpetrators were family members, and more than half were the victims' sons. 37 suspected victims had to be warded after ED consultation and eight died within six months of presentation. CONCLUSION: Mistreatment of the elderly in the local population is more prevalent than expected and victims can suffer adverse outcomes. Understanding of this problem is still incomplete and more research is required. Increased awareness of this problem in the community and the medical fraternity can better identify such patients.


Subject(s)
Elder Abuse/diagnosis , Aged , Aged, 80 and over , Crime Victims , Domestic Violence , Elder Abuse/therapy , Emergency Service, Hospital , Epidemiology , Family Relations , Female , Geriatrics/methods , Humans , Male , Singapore , Social Work
16.
Eur J Clin Invest ; 38(10): 743-51, 2008 Oct.
Article in English | MEDLINE | ID: mdl-18837799

ABSTRACT

BACKGROUND: Hypertriglyceridaemia, a consistent feature of dyslipidaemia in the metabolic syndrome (MetS), is related to the extent of abdominal fat mass and altered adipocytokine secretion. We determined the effect of weight loss by dietary restriction on markers of triglyceride-rich lipoprotein (TRL) metabolism and plasma adipocytokines. DESIGN: Thirty-five men with MetS participated in a 16 week randomized controlled dietary intervention study. Apolipoprotein (apo) C-III, apoB-48, remnant-like particle (RLP)-cholesterol, total adiponectin, high-molecular weight (HMW) adiponectin, and retinol-binding protein-4 (RBP-4) concentrations were measured using immunoassays. RESULTS: Compared with weight maintenance (n = 15), weight loss (n = 20) significantly decreased body weight, plasma insulin, triglycerides, total cholesterol, low-density lipoprotein (LDL)-cholesterol and lathosterol (P < 0.05). Weight loss also decreased plasma concentrations of apoC-III (-33%), apoB-48 (-37%), very low-density lipoprotein (VLDL)-apoB (-43%), RLP-cholesterol (-48%), and RBP-4 (-20%), and significantly increased plasma total (+20%) and HMW-adiponectin (+19%) concentrations. In the weight loss group, reduction in plasma apoC-III was associated (P < 0.05) with reduction in plasma apoB-48, VLDL-apoB, RLP-cholesterol and triglycerides. Increase in total adiponectin was associated (P < 0.05) with the reduction in plasma VLDL-apoB and triglycerides. The changes in HMW-adiponectin and RBP-4 were not associated with changes in plasma apoB-48, apoC-III, VLDL-apoB, RLP-cholesterol or triglycerides. In multiple regression analysis including changes in visceral fat, insulin and total adiponectin concentrations, the fall in plasma apoC-III concentration was an independent predictor of the reductions in plasma apoB-48, VLDL-apoB, RLP-cholesterol and triglycerides concentrations. CONCLUSIONS: In men with MetS, weight loss decreases the plasma concentrations of apoB-48, VLDL-apoB, RLP-cholesterol and triglycerides. This effect could partly relate to concomitant changes in plasma apoC-III and adiponectin concentrations that accelerate the catabolism of TRLs.


Subject(s)
Lipoproteins/metabolism , Metabolic Syndrome/metabolism , Triglycerides/metabolism , Weight Loss , Adult , Apolipoprotein B-48/analysis , Apolipoprotein C-III/analysis , Apolipoproteins B/analysis , Biomarkers/analysis , Cholesterol/analysis , Cytokines/analysis , Enzyme-Linked Immunosorbent Assay , Humans , Linear Models , Male , Metabolic Syndrome/diet therapy , Middle Aged
17.
Diabetes Obes Metab ; 8(6): 698-702, 2006 Nov.
Article in English | MEDLINE | ID: mdl-17026495

ABSTRACT

AIM: We compared the use of magnetic resonance imaging (MRI) as a test for liver fat content (LFAT) with proton magnetic resonance spectroscopy (MRS) and investigated its relationship with body fat distribution, insulin sensitivity, plasma lipids and lipoproteins. METHODS: LFAT was quantified by MRI and MRS in 17 free-living, healthy men with a wide range of body mass indexes. Fasting adiponectin was measured by immunoassay and insulin resistance by homeostasis assessment (HOMA) score. Intraperitoneal, retroperitoneal, anterior subcutaneous and posterior subcutaneous abdominal adipose tissue masses (ATMs) were determined by MRI. RESULTS: Measurements of LFAT by MRI and MRS were highly correlated (r = 0.851, p < 0.001). In univariate regression analysis, LFAT by MRI was also significantly correlated with plasma triglycerides (TGs), insulin, HOMA score, carbohydrate intake and the masses of all abdominal adipose tissue compartments (p < 0.05). LFAT was inversely correlated with plasma adiponectin (r = -0.505, p < 0.05). In multivariate linear regression analysis including plasma adiponectin and age, intraperitoneal ATM was an independent predictor of LFAT (beta-coefficient = 0.587, p = 0.024). Moreover, intraperitoneal ATM was also an independent predictor of HOMA score after adjusting for LFAT, plasma adiponectin and age (beta-coefficient = 0.810, p = 0.010). Conversely, LFAT was a significant predictor of plasma TG concentration after adjusting for adiponectin, intraperitoneal ATM, HOMA and age (beta-coefficient = 0.751, p = 0.007). Similar findings applied with LFAT measured by MRS. CONCLUSIONS: These data suggest that MRI is as good as MRS to quantify liver fat content. Our data also suggest that liver fat content could link intraabdominal fat with insulin resistance and dyslipidaemia.


Subject(s)
Adipose Tissue/anatomy & histology , Body Fat Distribution , Insulin Resistance/physiology , Lipids/blood , Liver/anatomy & histology , Adiponectin/blood , Anthropometry/methods , Humans , Lipoproteins/blood , Magnetic Resonance Imaging/methods , Magnetic Resonance Spectroscopy/methods , Male , Middle Aged , Reproducibility of Results , Triglycerides/blood
19.
Clin Endocrinol (Oxf) ; 63(6): 650-6, 2005 Dec.
Article in English | MEDLINE | ID: mdl-16343099

ABSTRACT

OBJECTIVE: We investigated the effects of pravastatin on chylomicron remnant catabolism measured with a 13C stable isotope breath test and plasma apolipoprotein (apo) B-48 and remnant-like particle (RLP)-cholesterol in postmenopausal women with type 2 diabetes mellitus. PATIENTS AND MEASUREMENTS: Nineteen postmenopausal women with type 2 diabetes were randomized to receive 40 mg/day pravastatin or no treatment for 6 weeks followed by a 2-week washout period, and crossed over for a further 6 weeks. Fractional catabolic rate (FCR) of a chylomicron remnant-like emulsion was determined from 13CO2 enrichment in the breath and plasma using isotope-ratio mass spectrometry and multicompartmental modelling. Plasma apo B-48 and RLP-cholesterol concentrations were also measured as static markers of chylomicron remnant metabolism. RESULTS: Pravastatin significantly reduced plasma concentrations of cholesterol (5.9 +/- 0.3 vs. 4.8 +/- 0.2 mmol/l; P < 0.001), low density lipoprotein (LDL)-cholesterol (3.5 +/- 0.2 vs. 2.6 +/- 0.2 mmol/l; P < 0.001), triglyceride (2.1 +/- 0.3 vs. 1.7 +/- 0.2 mmol/l; P = 0.017), non-high density lipoprotein (HDL)-cholesterol (4.4 +/- 0.3 vs. 3.3 +/- 0.2 mmol/l; P < 0.001), lathosterol/total cholesterol ratio (2.6 +/- 0.2 vs. 2.0 +/- 0.3, P = 0.035), apo B-100 (1.1 +/- 0.1 vs. 0.8 +/- 0.1 g/l; P = 0.001), apo B-48 (4.8 +/- 0.9 vs. 3.3 +/- 0.6 mg/l; P = 0.016), and RLP-cholesterol (31.4 +/- 8.2 vs. 18.6 +/- 4.6 mg/dl; P = 0.024). Pravastatin was also associated with an increase in sitosterol/total cholesterol ratio (2.8 +/- 0.3 vs. 3.1 +/- 0.3, P = 0.029). Chylomicron remnant-like emulsion catabolism was not, however, significantly altered by pravastatin estimated by either breath or plasma clearance measurements. CONCLUSIONS: In postmenopausal women, pravastatin decreases plasma concentrations of remnant lipoproteins by a mechanism that may relate chiefly to inhibition of remnant production, but this requires further evaluation.


Subject(s)
Anticholesteremic Agents/therapeutic use , Chylomicrons/metabolism , Diabetes Mellitus, Type 2/drug therapy , Diabetes Mellitus, Type 2/metabolism , Pravastatin/therapeutic use , Aged , Apolipoprotein B-48 , Apolipoproteins B/blood , Breath Tests , Carbon Isotopes/blood , Cholesterol/blood , Cholesterol, LDL/blood , Chylomicron Remnants , Chylomicrons/blood , Cross-Over Studies , Diabetes Mellitus, Type 2/diet therapy , Female , Humans , Mass Spectrometry , Metabolic Clearance Rate/drug effects , Middle Aged , Triglycerides/blood
20.
J Biomech ; 38(10): 2130-3, 2005 Oct.
Article in English | MEDLINE | ID: mdl-16084215

ABSTRACT

Dye-based pressure-sensitive films are advantageous in plantar pressure studies due to their ease of use, cost-effectiveness, and ability to produce measurements within the shoe. To circumvent the use of proprietary equipment and software to relate the dye-stained film to load, an alternative approach of using a conventional flatbed scanner and generic image processing software is attempted here instead. The technique revealed high linear increasing and decreasing trends for the respective red and blue normalized intensities (R(2) > 0.95) and low standard deviation in all readings (<0.06) overall. By subtracting the blue from the red normalized intensity, it was discovered that the measurement sensitivity could be doubled. The results here confirm the viability of using a conventional flatbed scanner and generic image processing software to relate the dye-stained pressure films to load. The adoption of this approach promises substantial cost savings.


Subject(s)
Coloring Agents , Fasciitis, Plantar/diagnosis , Image Enhancement/instrumentation , Color , Foot , Humans , Singapore
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