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1.
Heliyon ; 10(4): e25948, 2024 Feb 29.
Article in English | MEDLINE | ID: mdl-38384528

ABSTRACT

Social media marketing plays a relevant role in the brand promotion of enterprises owing to its advantages of rapid and diversified communication with consumers. The Chinese Internet enterprise Alipay launched Ant Forest as a mobile application with gamified social functions, bringing consumer-brand engagement. Ant Forest provides a variety of gamification functions (e.g. point, leaderboard, badge, task and teamwork) to encourage users to participate in environmental protection and public welfare activities. These gamification mechanisms, combined with the spread of social media, have realised the co-creation of user brand value. In the current study, 305 Gen Z users of Ant Forest were surveyed through an online questionnaire, and the data analysis was conducted using the partial least squares structural equation modelling (PLS-SEM) method. This study indicates that the four elements of entertainment, trendiness, customisation and word-of-mouth in social media marketing have statistically significant direct effects on the consumer-brand engagement in Ant Forest. In addition, gamification shows a significant positive moderating effect on the relationship between customisation and consumer-brand engagement and a significant negative moderating effect on the relationship between trendiness and consumer-brand engagement in Ant Forest. This study adds gamification to the conceptual system of social media marketing and provides suggestions for the development of gamified social media marketing applications.

2.
Inquiry ; 60: 469580231220135, 2023.
Article in English | MEDLINE | ID: mdl-38140753

ABSTRACT

Foot self-care has been commonly studied among people with diabetes. Previous research on foot self-care among those with diabetes-related high-risk feet is almost unavailable or very limited. The current study aims to fill this gap and provide a contemporary unprecedented analysis of this area of specialization. To assess the levels of, and factors associated with foot self-care among people with diabetes-related high-risk feet. A multi-center cross-sectional study from Jordan assessed the foot self-care of 107 participants with diabetes-related high-risk feet. Multiple socio-demographic, physiological, and psychosocial factors were collected, and the Arabic version of the diabetes foot self-care behavior scale was used to estimate the foot self-care of the study population. A multiple linear regression model was employed to identify factors associated with foot self-care. The mean score of foot self-care was 25.4 ± 7.1 (35 is the highest) indicating ~73% of adherence to foot self-care. Factors associated with higher foot self-care were being treated at the King Abdullah University Hospital (ß = .30, P < .01) and reporting higher scores of patients' interpretations about neuropathy physical causes of foot ulcers (ß = ".22," P = .02). People with diabetes-related high-risk feet reported a relatively adequate foot self-care practice. However, clinicians are still required to enhance foot self-care among this population. Health promotion programs may benefit from engaging people in understanding the pathophysiology of diabetes-related foot ulcers to improve foot self-care practices.


Subject(s)
Diabetes Mellitus , Diabetic Foot , Foot Ulcer , Humans , Diabetic Foot/therapy , Diabetic Foot/epidemiology , Cross-Sectional Studies , Self Care/adverse effects , Risk Factors , Foot Ulcer/complications
3.
Int J Mol Sci ; 24(11)2023 Jun 02.
Article in English | MEDLINE | ID: mdl-37298631

ABSTRACT

The treatment of cancer patients has dramatically changed over the past decades with the advent of monoclonal antibodies, immune-checkpoint inhibitors, bispecific antibodies, and innovative T-cell therapy. Antibody-drug conjugates (ADCs) have also revolutionized the treatment of cancer. Several ADCs have already been approved in hematology and clinical oncology, such as trastuzumab emtansine (T-DM1), trastuzumab deruxtecan (T-DXd), and sacituzumab govitecan (SG) for the treatment of metastatic breast cancer, and enfortumab vedotin (EV) for the treatment of urothelial carcinoma. The efficacy of ADCs is limited by the emergence of resistance due to different mechanisms, such as antigen-related resistance, failure of internalization, impaired lysosomal function, and other mechanisms. In this review, we summarize the clinical data that contributed to the approval of T-DM1, T-DXd, SG, and EV. We also discuss the different mechanisms of resistance to ADCs, as well as the ways to overcome this resistance, such as bispecific ADCs and the combination of ADCs with immune-checkpoint inhibitors or tyrosine-kinase inhibitors.


Subject(s)
Carcinoma, Transitional Cell , Immunoconjugates , Urinary Bladder Neoplasms , Humans , Immune Checkpoint Inhibitors , Carcinoma, Transitional Cell/drug therapy , Urinary Bladder Neoplasms/drug therapy , Immunoconjugates/therapeutic use , Immunoconjugates/pharmacology , Ado-Trastuzumab Emtansine/pharmacology
4.
PLoS One ; 17(7): e0271393, 2022.
Article in English | MEDLINE | ID: mdl-35830459

ABSTRACT

BACKGROUND: COVID-19 pandemic has led to a catastrophic shortage of ICU beds. This has resulted in the need to identify patients that can be discharged early before full clinical recovery. We designed this study to determine if in changes routine tests like CBCD and CRP can be a useful complement to clinical status when deciding to discharge patients from ICU. METHODS: This retrospective study was conducted in Rafic Hariri University Hospital. Levels of biomarkers measured at admission (T1) and within 3 days of outcome (T2) were collected and ratios (T2/T1) were calculated. The Odds Ratios of association between the changes in these biomarkers and outcome were estimated. Multivariate analysis and AUC for the performance of these biomarkers were also conducted. RESULTS: We found on multivariate analysis that reduction in counts of lymphocyte and platelets and elevation in counts of neutrophils and level of CRP (T2/T1 ratio > 1) are strongly associated with mortality with respective ORs estimated at 6.74, 3.26, 5.65 and 4.34 [p-values < 0.001]. AUCs were found to lie in a range of 0.68 to 0.81 indicating fair to good performance. Other factors found to impact survival were AKI, AF and ACS [p-values < 0.01]. In contrast to other studies, risk factors didn't show an association with survival when adjusted for effects of complications and changes in biomarker levels. CONCLUSIONS: Our results confirm that inexpensive tests like lymphocyte count and CRP can be reliably used to follow COVID-19 patients in ICU and to support the decision to discharge patients.


Subject(s)
COVID-19 , Biomarkers , COVID-19/epidemiology , Humans , Lebanon/epidemiology , Pandemics , Prognosis , Retrospective Studies
5.
Front Cardiovasc Med ; 7: 619083, 2020.
Article in English | MEDLINE | ID: mdl-33490119

ABSTRACT

Aim: The present study aims to identify those microRNAs (miRNAs) in patients with univentricular heart (UVH) disease with and without Fontan palliation that may be associated with advanced liver fibrosis/cirrhosis. Materials and Methods: SurePrint™ 8 × 60K Human v21 miRNA arrays were used to determine the miRNA abundance profiles in the blood of 48 UVH patients with and without Fontan palliation and 32 matched healthy controls. The abundance levels of selected miRNAs have been validated by quantitative reverse transcription-polymerase chain reaction (RT-qPCR). Results: According to microarray analysis, 50 miRNAs were found to be significantly abundant in UVH patients of which miR-29b-3p and miR-29c-3p were significantly related to the model of end-stage liver disease (MELD)-Albumin and albumin-bilirubin (ALBI) score representing advanced liver fibrosis/cirrhosis. Relative expression levels of both miRNAs were significantly higher in patients with a higher collapsibility index representing venous hepatic congestion, a higher MELD-Albumin or ALBI score and incomplete or no Fontan palliation. In the logistic regression analysis, a MELD-Albumin score ≥ 11 or ALBI score > -2.6 were best predicted by total bilirubin (OR 6.630, P = 0.016), albumin (OR 0.424, P = 0.026), and miR-29c-3p (OR 33.060, P = 0.047). After adjustment to the status of Fontan palliation, however, no statistical significance of these parameters was found thus underlining the importance of palliation status on progression of liver fibrosis/ cirrhosis in UVH patients. Conclusions: In UVH patients with and without Fontan palliation, miR-29b-3p and miR-29c-3p seem to be markers of advanced liver fibrosis/cirrhosis and thus may be used in the risk assessment of these patients.

6.
PLoS One ; 14(10): e0223606, 2019.
Article in English | MEDLINE | ID: mdl-31600281

ABSTRACT

BACKGROUND: In patients with left heart failure, micro-RNAs (miRNAs) have been shown to be of diagnostic and prognostic value. The present study aims to identify those miRNAs in patients with univentricular heart (UVH) disease that may be associated with overt heart failure. METHODS: A large panel of human miRNA arrays were used to determine miRNA expression profiles in the blood of 48 UVH patients and 32 healthy controls. For further selection, the most abundantly expressed miRNA arrays were related to clinical measures of heart failure and selected miRNAs validated by polymerase chain reaction were used for the prediction of overt heart failure and all-cause mortality. RESULTS: According to microarray analysis, 50 miRNAs were found to be significantly abundant in UVH patients of which miR-150-5p was best related to heart failure parameters. According to ROC analysis, NT-proBNP levels (AUC 0.940, 95% CI 0.873-1.000; p = 0.001), miR-150-5p (AUC 0.905, 95% CI 0.779-1.000; p = 0.001) and a higher NYHA class ≥ III (AUC 0.893, 95% CI 0.713-1.000; p = 0.002) were the 3 most significant predictors of overt heart failure. Using a combined biomarker model, AUC increased to 0.980 indicating an additive value of miR-150-5p. Moreover, in the multivariate analysis, a higher NYHA class ≥ III (p = 0.005) and miR-150-5p (p = 0.006) turned out to be independent predictors of overt heart failure. CONCLUSION: In patients with UVH, miR-150-5p is an independent predictor of overt heart failure and thus may be used in the risk assessment of these patients.


Subject(s)
Heart Failure/diagnosis , Heart Failure/genetics , MicroRNAs/metabolism , Univentricular Heart/complications , Adolescent , Adult , Child , Female , Gene Expression Regulation , Heart Failure/complications , Heart Failure/mortality , Humans , Male , MicroRNAs/genetics , Middle Aged , Multivariate Analysis , Natriuretic Peptide, Brain/blood , Peptide Fragments/blood , Prognosis , ROC Curve , Univentricular Heart/blood , Young Adult
7.
Atherosclerosis ; 285: 153-162, 2019 06.
Article in English | MEDLINE | ID: mdl-31055222

ABSTRACT

BACKGROUND AND AIMS: Higher blood levels of the omega-3 fatty acids, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), have been associated with fewer cardiovascular events and lower mortality in prospective studies. Our aim was to determine a target level of EPA and DHA to prevent progression of coronary artery plaque. METHODS: 218 subjects with stable coronary artery disease on statins were randomized to high-dose EPA and DHA (3.36 g daily) or no omega-3 for 30 months. Coronary plaque volume was measured by coronary computed tomographic angiography. Plasma phospholipid levels of EPA, DHA and total fatty acids were measured by gas chromatography mass spectrometry. The omega-3 fatty acid index was calculated as EPA+DHA/total fatty acid. RESULTS: Mean (SD) age was 62.9 (7.8) years; mean (SD) LDL-C level 78.6 (27.3) mg/dL and median triglyceride level 122 mg/dL. Subjects assigned to EPA and DHA had increased plasma EPA and DHA levels variably from 1.85% to 13.02%. Plasma omega-3 fatty acid index ≥4% prevented progression of fibrous, noncalcified, calcified and total plaque in nondiabetic subjects whereas those in the lowest quartile (<3.43%) had significant progression of fibrous, calcified and total plaque. No difference was observed in diabetic subjects. CONCLUSIONS: EPA and DHA added to statins prevented coronary plaque progression in nondiabetic subjects with mean LDL-C <80 mg/dL, when an omega-3 index ≥4% was achieved. Low omega-3 index <3.43% identified nondiabetic subjects at risk of coronary plaque progression despite statin therapy. These findings highlight the importance of measuring plasma levels of omega-3 fatty acids early and at trial conclusion. Targeting an omega-3 index ≥4% maximizes cardiovascular benefit.


Subject(s)
Coronary Artery Disease/blood , Coronary Artery Disease/drug therapy , Docosahexaenoic Acids/blood , Eicosapentaenoic Acid/blood , Hydroxymethylglutaryl-CoA Reductase Inhibitors/therapeutic use , Plaque, Atherosclerotic/blood , Aged , Coronary Artery Disease/complications , Coronary Artery Disease/prevention & control , Disease Progression , Docosahexaenoic Acids/physiology , Eicosapentaenoic Acid/physiology , Female , Humans , Male , Middle Aged , Plaque, Atherosclerotic/complications , Plaque, Atherosclerotic/prevention & control
8.
BMC Womens Health ; 19(1): 9, 2019 01 10.
Article in English | MEDLINE | ID: mdl-30630476

ABSTRACT

BACKGROUND: There is limited evidence regarding the ways in which displacement disrupts social norms, expectations and trajectories for adolescent girls and young women and the resulting impacts on their risks of violence. This knowledge gap is especially marked with regards to Syrian adolescent girls and young women seeking refuge in Turkey. We explored risks of gender-based violence against Syrian adolescent girls and young women in Turkey and examined how these risks were shaped by their displacement. METHODS: Data were collected in August 2016 in Izmir, Turkey through five sex-specific focus group discussions with Syrian adolescents and young people (aged 15-25 years) and two mixed gender focus group discussions with Syrian adults (18 years and older). Group discussions covered the issues facing Syrian adolescents and young women in Turkey, and how these were influenced by their displacement. Discussions in Arabic were audio-recorded, transcribed and translated into English. Data were coded inductively, and analysed thematically. RESULTS: Syrian adolescent girls and young women expressed an increased sense of vulnerability to violence since their displacement. Due to financial strains and limited educational opportunities, they were often encouraged by parents to work or marry, both of which they perceived to increase the risks of violence. In contrast, some adults suggested that marriage could protect adolescent girls and young women from risks of violence associated with working. Being alone outside the home was viewed as risky by all participants due to pervasive sexual, verbal and physical harassment, aggression, and even kidnapping attempts. To limit these risks, many parents reported keeping adolescent girls and young women at home, or ensuring that they were accompanied by male relatives when in public. CONCLUSIONS: Syrian adolescent girls and young women face multiple risks of violence following displacement related to altered social trajectories. Some family-based strategies to protect young women from violence could reinforce restrictive gender norms and increase risks of violence. Interventions to address violence should include providing safe spaces, access to education and safe transport for young women, and financial support for families as well as community-based interventions to address the daily risks of sexual harassment in public spaces.


Subject(s)
Attitude to Health/ethnology , Crime Victims/statistics & numerical data , Refugees/psychology , Sexual Behavior/ethnology , Women's Health/ethnology , Adolescent , Adult , Crime Victims/psychology , Female , Focus Groups , Humans , Male , Qualitative Research , Refugees/statistics & numerical data , Syria/ethnology , Turkey/epidemiology , Young Adult
9.
Atherosclerosis ; 277: 34-41, 2018 10.
Article in English | MEDLINE | ID: mdl-30170222

ABSTRACT

BACKGROUND AND AIMS: Hypertension is associated with increased clinical and subclinical coronary artery disease (CAD); however, the relationship between blood pressure and coronary plaque volume is unclear. We examined the effect of systolic blood pressure (SBP) and diastolic blood pressure (DBP) on coronary artery plaque volume. METHODS: 285 subjects with stable CAD on statin therapy underwent coronary computed tomographic angiography to measure volume of fatty, fibrous, noncalcified, calcified and total coronary plaque. RESULTS: Mean (SD) age was 63.1 (7.7); mean (SD) LDL-C, 78.7 mg/dL (28.5). Compared to the highest DBP tertile (>76 mmHg), those in the lowest DBP tertile (≤68 mmHg) had lower volumes of fatty: 10.0 vs. 7.7 mm3/mm, (p trend = 0.042), fibrous: 19.6 vs. 13.8 mm3/mm (p trend = 0.011), non-calcified: 29.7 vs. 22.5 mm3/mm (p trend = 0.017) and total plaque: 37.8 vs. 25.1 mm3/mm (p trend = 0.010) whereas there was no relationship with SBP tertiles. Similarly, when examined as a continuous variable, higher DBP was a significant independent predictor of higher plaque volume after multivariate adjustment: for every 1 mmHg increase in DBP, fibrous plaque increased 0.128 mm3/mm (p = 0.022), noncalcified plaque increased 0.176 mm3/mm (p = 0.045), calcified plaque increased 0.096 mm3/mm (p = 0.001) and total plaque increased 0.249 mm3/mm (p = 0.019) whereas SBP ranging from 95 to 154 mmHg did not predict plaque volume. CONCLUSIONS: Level of DBP predicts coronary plaque with a DBP tertile ≤68 mmHg associated with the least amount of coronary plaque in subjects with LDL-C < 80 mg/dL.


Subject(s)
Blood Pressure , Computed Tomography Angiography , Coronary Angiography/methods , Coronary Artery Disease/etiology , Coronary Vessels/diagnostic imaging , Hypertension/complications , Plaque, Atherosclerotic , Adult , Aged , Aged, 80 and over , Coronary Artery Disease/diagnostic imaging , Coronary Artery Disease/physiopathology , Cross-Sectional Studies , Diastole , Female , Fibrosis , Humans , Hypertension/diagnosis , Hypertension/physiopathology , Male , Middle Aged , Predictive Value of Tests , Randomized Controlled Trials as Topic , Risk Factors , Vascular Calcification/diagnostic imaging , Vascular Calcification/etiology , Vascular Calcification/physiopathology , Young Adult
10.
J Clin Lipidol ; 12(4): 937-947.e2, 2018.
Article in English | MEDLINE | ID: mdl-29752179

ABSTRACT

BACKGROUND: Poor physical function impairs fitness and exercise and is associated with worse cardiovascular outcomes and all-cause mortality. Joint pain and stiffness limit physical function. OBJECTIVE: To determine if eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) supplementation improves physical function and exercise in coronary artery disease (CAD) patients. METHODS: A total of 291 subjects with stable CAD were randomized to either Lovaza (1.86 g of EPA and 1.5 g of DHA daily) or no Lovaza (control) for 1 year. Change in pain, stiffness, and physical function was assessed by the Western Ontario and McMaster Universities Arthritis Index. Minutes of exercise per week were recorded, and musculoskeletal events were reported. RESULTS: Mean age (standard deviation) was 63.3 (7.6) years. In the intention-to-treat analysis, compared with controls, those on Lovaza had better physical function (mean difference, -11.0%, 95% confidence interval [CI] -18.5% to -3.5%, P = .004), better total Western Ontario and McMaster Universities Arthritis Index scores (mean difference, -9.8%, 95% CI -16.6% to -3.0%, P = .005), more exercise per week (135 minutes vs 197 minutes, respectively, P = .028), and less joint replacement (11 vs 1, respectively, P = .002). Pain and stiffness showed a trend toward significance (P = .06). The per-protocol analysis also showed less stiffness compared with controls (mean difference, -11.5%, 95% CI -22.9% to -0.1%, P = .048). CONCLUSION: High-dose EPA and DHA may benefit CAD patients by preserving physical function, increasing amount of exercise, and reducing joint replacement. EPA and DHA may be a safe preventative strategy against musculoskeletal symptoms in CAD patients.


Subject(s)
Coronary Artery Disease/drug therapy , Docosahexaenoic Acids/therapeutic use , Eicosapentaenoic Acid/analogs & derivatives , Exercise , Aged , Arthroplasty, Replacement , Blood Cell Count , C-Reactive Protein/analysis , Coronary Artery Disease/pathology , Dietary Supplements , Eicosapentaenoic Acid/therapeutic use , Female , Humans , Male , Middle Aged , Treatment Outcome
11.
J Am Heart Assoc ; 6(12)2017 Dec 15.
Article in English | MEDLINE | ID: mdl-29246960

ABSTRACT

BACKGROUND: Although statins reduce cardiovascular events, residual risk remains. Therefore, additional modalities are needed to reduce risk. We evaluated the effect of eicosapentaenoic acid and docosahexaenoic acid in pharmacologic doses added to statin treatment on coronary artery plaque volume. METHODS AND RESULTS: A total of 285 subjects with stable coronary artery disease on statins were randomized to omega-3 ethyl-ester (1.86 g of eicosapentaenoic acid and 1.5 g of docosahexaenoic acid daily) or no omega-3 (control) for 30 months. Coronary plaque volume was assessed by coronary computed tomographic angiography. Mean (SD) age was 63.0 (7.7) years; mean low-density lipoprotein cholesterol ≤80 mg/dL. In the intention-to-treat analysis, our primary endpoint, noncalcified plaque volume, was not different between groups (P=0.14) but approached significance in the per protocol analysis (P=0.07). When stratified by age in the intention-to-treat analysis, younger omega-3 subjects had significantly less progression of the primary endpoint, noncalcified plaque (P=0.013), and fibrous, calcified and total plaque. In plaque subtype analysis, controls had significant progression of fibrous plaque compared to no change in the omega-3 ethyl-ester group (median % change [interquartile range], 5.0% [-5.7, 20.0] versus -0.1% [-12.3, 14.5], respectively; P=0.018). Among those on low-intensity statins, omega-3 ethyl-ester subjects had attenuation of fibrous plaque progression compared to controls (median % change [interquartile range], 0.3% [-12.8, 9.0] versus 4.8% [-5.1, 19.0], respectively; P=0.032). In contrast, those on high-intensity statins had no difference in plaque change in either treatment arm. CONCLUSIONS: High-dose eicosapentaenoic acid and docosahexaenoic acid provided additional benefit to statins in preventing progression of fibrous coronary plaque in subjects adherent to therapy with well-controlled low-density lipoprotein cholesterol levels. The benefit on low-intensity statin, but not high-intensity statin, suggests that statin intensity affects plaque volume. CLINICAL TRIAL REGISTRATION: URL: http://www.ClinicalTrials.gov. Unique identifier: NCT01624727.


Subject(s)
Coronary Artery Disease/drug therapy , Coronary Vessels/diagnostic imaging , Docosahexaenoic Acids/administration & dosage , Eicosapentaenoic Acid/administration & dosage , Hydroxymethylglutaryl-CoA Reductase Inhibitors/administration & dosage , Plaque, Atherosclerotic/drug therapy , Administration, Oral , Adult , Aged , Aged, 80 and over , Biomarkers/blood , Computed Tomography Angiography , Coronary Angiography , Coronary Artery Disease/blood , Coronary Artery Disease/diagnosis , Coronary Vessels/drug effects , Disease Progression , Dose-Response Relationship, Drug , Drug Therapy, Combination , Female , Follow-Up Studies , Humans , Lipoproteins, LDL/blood , Male , Middle Aged , Plaque, Atherosclerotic/blood , Plaque, Atherosclerotic/diagnosis , Risk Factors , Treatment Outcome , Young Adult
12.
J Neurosci Rural Pract ; 7(2): 232-7, 2016.
Article in English | MEDLINE | ID: mdl-27114654

ABSTRACT

OBJECTIVE: To determine the relationship between resting tremor (RT) and action tremor (AT) in Parkinson's disease (PD) patients. METHODS: A retrospective study of RT and AT severity was conducted in 100 PD patients. The severity rating for each type of tremor in the upper extremities was assessed. The disparity in tremor severity between extremities for each tremor type was compared to that of the other two to identify commonalities in the laterality of the tremor manifestation. RESULTS: Overall, RT is predictive of AT on the same side, but not the opposing side of the body. Patients with less intense resting right upper limb (RRU) tremor and moderately intense RRU tremor were significantly more likely to have an action right upper limb (ARU) tremor (-1.53, P = 0.020; -1.88, P = 0.005, respectively). Similarly, patients with less intense resting left upper limb (RLU) tremor and moderately intense RLU tremors were significantly more likely to have an action left upper limb (ALU) tremor (-3.49, P = 0.000; -1.86, P = 0.017, respectively). In addition, RRU and ALU tremors were associated with an increase in RLU and ARU tremors, respectively. CONCLUSION: Tremors are common findings in PD patients, and often impair quality of life. By identifying and classifying the relationship between resting and ATs in PD patients, our study sheds light onto the importance of better understanding and future management of this debilitating symptomology.

13.
J Neurosci Rural Pract ; 7(1): 67-9, 2016.
Article in English | MEDLINE | ID: mdl-26933347

ABSTRACT

CONTEXT: Late onset Parkinson's disease (LOPD) is a neurodegenerative disorder afflicting individuals of ages 60 and older. However, 5-10% of cases can begin earlier between the ages 20 to 40, and are classified as young onset Parkinson disease (YOPD). AIM: In turn, this study aims to observe the trend in the choice of drug administered to patients with both YOPD and LOPD, with particular emphasis on this trend in its relation to the practice background of the neurologist. SETTINGS AND DESIGN: A cross-sectional study was conducted in a community based Parkinson's disease and movement disorder clinic. STATISTICAL ANALYSIS USED: Using a retrospective chart review data was obtained and analysed. RESULTS: The results showed that 83% of general neurologists prescribed levodopa to their patients with YOPD, whereas movement-disorder specialists took a different approach altogether. They opted not to use levodopa and, in its stead, prescribed a mixture of alternate drugs.

14.
Arch Biochem Biophys ; 567: 46-58, 2015 Feb 01.
Article in English | MEDLINE | ID: mdl-25524740

ABSTRACT

A comprehensive investigation of peptides derived from the 22-29 region of human islet amyloid polypeptide (hIAPP) that contain phenylalanine analogs at position 23 with a variety of electron donating and withdrawing groups, along with heteroaromatic surrogates, has been employed to interrogate how π-electron distribution effects amyloid formation. Kinetic aggregation studies using turbidity measurements indicate that electron rich aromatic ring systems consistently abolish the amyloidogenic propensity of hIAPP(22-29). Electron poor systems modulate the rate of aggregation. Raman and Fourier transform infrared spectroscopy confirm the parallel ß-sheet secondary structure of aggregates derived from peptides containing electron poor phenylalanine analogs and provide direct evidence of ring stacking. Transmission electron microscopy confirms the presence of amyloid fibrils. The effect of aryl substituent geometry on peptide self-assembly reveals that the electronic nature of substituents and not their steric profile is responsible for failure of the electron donating group peptides to aggregate. Non-aggregating hIAPP(22-29) peptides were found to inhibit the self-assembly of full-length hIAPP(1-37). The most potent inhibitory peptides contain phenylalanine with the p-amino and p-formamido functionalities. These novel peptides may serve as leads for the development of future aggregation inhibitors. A potential mechanism for inhibition of amylin self-assembly by electron rich (-29) peptides is proposed.


Subject(s)
Electrons , Islet Amyloid Polypeptide/chemistry , Peptide Fragments/chemistry , Protein Aggregation, Pathological , Amino Acid Sequence , Humans
15.
Opt Express ; 20(21): 23690-9, 2012 Oct 08.
Article in English | MEDLINE | ID: mdl-23188335

ABSTRACT

We have investigated the stimulated emission properties of Nd(3+) doped La(2)O(2)S powders at room temperature as a function of pumping energy density, excitation wavelength, and Nd(3+) ion concentration. The absolute stimulated emission energy has been measured. Expressions for the slope efficiencies and lasing thresholds as a function of rare earth concentration and pumping wavelengths, which qualitatively agree with experimental observations, are discussed.


Subject(s)
Lanthanum/chemistry , Lasers , Neodymium/chemistry , Oxides/chemistry , Sulfides/chemistry , Equipment Design , Equipment Failure Analysis , Powders
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