Publications by authors named "Osman I"

Ultraviolet (UV)-induced DNA mutations produce genetic drivers of cutaneous melanoma initiation and numerous neoantigens that can trigger anti-tumor immune responses in the host. Consequently, melanoma cells must rapidly evolve to evade immune detection by simultaneously modulating cell-autonomous epigenetic mechanisms and tumor-microenvironment interactions. Angiogenesis has been implicated in this process; although an increase of vasculature initiates the immune response in normal tissue, solid tumors manage to somehow enhance blood flow while preventing immune cell infiltration.

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Purpose: Patients with stage II and III cutaneous primary melanoma vary considerably in their risk of melanoma-related death. We explore the ability of methylation profiling to distinguish primary melanoma methylation classes and their associations with clinicopathologic characteristics and survival.

Materials And Methods: InterMEL is a retrospective case-control study that assembled primary cutaneous melanomas from American Joint Committee on Cancer (AJCC) 8th edition stage II and III patients diagnosed between 1998 and 2015 in the United States and Australia.

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Background: This research aims to unravel the prevalence of postnatal emotional disorders with a focus on how postnatal anxiety remained under-estimated and often embroiled in postnatal depression.

Methods: Out of 600 postnatal women invited to take part in this study from two prominent primary care clinics in Khartoum, 468 women agreed to participate in this study. Three questionnaires were utilized in this study, a Personal Information Questionnaire (PIQ), Hospital Anxiety and Depression Scale (HADS), and Beck depression Inventory (BDI).

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Article Synopsis
  • Plasma lipids are primarily carried in lipoproteins containing apolipoprotein B (apoB), and high levels of these lipoproteins are linked to metabolic diseases and increased cardiovascular risk.
  • A specific microRNA, miR-615-3p, was found to interact with apoB mRNA, leading to reduced apoB100 production in liver cells, suggesting a way to regulate apoB expression.
  • The study suggests that miR-615-3p acts as a negative regulator of apoB in liver cells, and further exploration may reveal more microRNAs that could help control lipoprotein metabolism.
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Gut microbiota dysbiosis is linked to vascular wall disease, but the mechanisms by which gut microbiota cross-talk with the host vascular cells remain largely unknown. Shikimic acid (SA) is a biochemical intermediate synthesized in plants and microorganisms, but not mammals. Surprisingly, recent metabolomic profiling data demonstrate that SA is detectable in human and murine blood.

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Article Synopsis
  • - Diverse cellular stresses activate heat shock factor 1 (HSF1), which helps manage protein stability and has broader roles in promoting cancer, but its effects on immune cells in tumors are not well understood.
  • - Research using a model of HSF1 activation shows that heightened HSF1 activity in natural killer (NK) cells negatively affects their ability to kill tumors and produce cytokines for immune response.
  • - HSF1 directly influences the expression of important factors for NK cell function, suggesting that understanding its role could improve therapies using NK cells to fight cancer and lead to better treatment combinations.
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Unlabelled: Melanoma being one of the most common and deadliest skin cancers, has been rising since the past decade. Patients at advanced stages of the disease have very poor prognoses, as opposed to at the earlier stages. Nowadays the standard-of-care of advanced melanoma is resection followed by immune checkpoint inhibition based immunotherapy.

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Purpose: Immune checkpoint inhibition (ICI) shows benefits in adjuvant (AT) and neoadjuvant melanoma treatments. However, ICI frequently induces severe immune-related adverse events (irAE). Unlike metastatic disease, in which irAEs are a clinical trade-off for treatment that improves survival, the toxicity burden from ICI in the AT setting is a substantial clinical problem urging for irAE-predictive biomarkers.

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Introduction: Stunting is the most prevalent form of malnutrition among infants and young children population, both globally and locally. It refers to low height-for-age children and is primarily caused by chronic under nutrition. The objective of this study is to determine the association between stunting and feeding problems and to explore the risk factors for stunting among children aged 6 to 59 months attending health clinics in the Kuantan district.

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Dahl salt-sensitive (SS) rats fed a high-salt diet, but not low-salt, exhibit vascular dysfunction. Several substrains of SS rats exist that differ in their blood pressure phenotypes and salt sensitivity. The goal of this study was to investigate whether the John-Rapp-derived SS rat (SS/Jr), which exhibits spontaneous hypertension on a low-salt diet, presents with hallmarks of vascular dysfunction observed in another experimental model of hypertension independent of dietary salt, the spontaneously hypertensive rat (SHR).

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Importance: While the association between cross-sectional measures of social isolation and adverse health outcomes is well established, less is known about the association between changes in social isolation and health outcomes.

Objective: To assess changes of social isolation and mortality, physical function, cognitive function, cardiovascular disease (CVD), and stroke.

Design, Setting, And Participants: In a cohort design, social isolation changes in 4 years and subsequent risk of mortality and other outcomes were assessed using the 13 649 eligible Health and Retirement Study (HRS) respondents from the 2006 to 2020 waves.

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Atrioventricular valve parachute deformity is rare and is generally seen in the mitral position, called the parachute mitral valve. It is rare to see it in the tricuspid valve and up to now, there have been approximately 14 cases of parachute abnormalities in tricuspid valves in a literature review. We present here a 21-year-old male who presented to the emergency department with progressive shortness of breath over several months.

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Background: Incarcerated people have been disproportionately affected by the COVID-19 pandemic and face significant challenges to COVID-19 vaccine confidence.

Objectives: (1) Describe our partnerships with community members directly impacted by incarceration, (2) discuss the partnership's process for co-developing and implementing project interventions to increase COVID-19 vaccine confidence, and (3) share lessons learned from this unique community-engaged partnership.

Methods: An advisory board of 14 formerly incarcerated community members participated in this project.

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Amyloidosis is the condition when starch-like misfolded proteins form insoluble fibrils that deposit in tissues and cause dysfunction. Cardiac amyloidosis occurs due to the deposition of amyloid fibrils at the cardiac level and is an important cause of heart failure. This case reveals a patient with significant heart failure and arrhythmia, which later on turned out to be caused by cardiac amyloidosis.

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Introduction And Importance: Blunt abdominal trauma is one of the most common reasons for emergency department visits, and spleen and splenic vasculature is involved variably in those cases. Splenic artery pseudoaneurysm formation is one complication with potentially devastating consequences. Early detection and management are of paramount importance given its potential fatality.

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In real-life applications, nonlinear differential equations play an essential role in representing many phenomena. One well-known nonlinear differential equation that helps describe and explain many chemicals, physical, and biological processes is the Caudrey Dodd Gibbon equation (CDGE). In this paper, we propose the Laplace residual power series method to solve fractional CDGE.

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Background: Youth experiencing homelessness (YEH) face a wide range of complex barriers to COVID-19 vaccine confidence and access.

Objectives: Describe our process for engaging a cross-sector team centering equity and youth voice; outline our intervention strategies to enhance COVID-19 vaccine confidence and access among YEH; and discuss lessons learned through this community-engaged process.

Methods: We engaged partners from across sectors, including youth-serving agencies, healthcare organizations, public health organizations, and YEH.

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The gut microbiome (GMB) has been associated with outcomes of immune checkpoint blockade therapy in melanoma, but there is limited consensus on the specific taxa involved, particularly across different geographic regions. We analyzed pre-treatment stool samples from 674 melanoma patients participating in a phase-III trial of adjuvant nivolumab plus ipilimumab versus nivolumab, across three continents and five regions. Longitudinal analysis revealed that GMB was largely unchanged following treatment, offering promise for lasting GMB-based interventions.

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Glycosylation is a hallmark of cancer biology, and altered glycosylation influences multiple facets of melanoma growth and progression. To identify glycosyltransferases, glycans, and glycoproteins essential for melanoma maintenance, we conducted an growth screen with a pooled shRNA library of glycosyltransferases, lectin microarray profiling of benign nevi and melanoma patient samples, and mass spectrometry-based glycoproteomics. We found that α-2,3 sialyltransferases ST3GAL1 and ST3GAL2 and corresponding α-2,3-linked sialosides are upregulated in melanoma compared to nevi and are essential for melanoma growth and .

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Background Since its inception, the Faculty of Medicine at Gezira University has recognized the critical role of academic advising in supporting student success. This commitment translates into a well-established advising system, fully integrated into the academic regulations and subject to continuous evaluation and improvement for maximum effectiveness and relevance. Regular orientation sessions ensure that both faculty and students are equipped to make the most of this valuable resource.

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Article Synopsis
  • Cardiovascular disease is the leading cause of death, with hypertension (HTN) as its top risk factor; significant research has identified over 1,500 genetic factors linked to HTN, but their individual impact is minor.
  • Recent studies are exploring the use of genome-wide association data and artificial intelligence to create a polygenic risk score (PRS) for predicting HTN, though genetics account for less than 30% of risk factors.
  • The gut microbiota has emerged as an important non-genetic factor influencing blood pressure, and combining microbiota data with PRS and clinical risk scores (CRS) could improve predictions for HTN progression when integrated with AI.
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Melanoma poses a poor prognosis with high mortality rates upon metastasis. Exploring the molecular mechanisms governing melanoma progression paves the way for developing novel approaches to control melanoma metastasis and ultimately enhance patient survival rates. Extracellular galectin-3 (Gal-3) has emerged as a pleiotropic promoter of melanoma metastasis, exerting varying activities depending on its interacting partner.

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Article Synopsis
  • A study investigates the complex relationships between tumor infiltrating leukocytes and lymphatic vessels in primary melanoma, revealing how these interactions influence anti-tumor immunity and potential metastasis.
  • Researchers utilized a quantitative, multiplexed imaging technique to analyze 28 treatment-naïve melanoma samples, finding significant variability in lymphovascular subtypes and their localization around tumors.
  • The findings suggest that specific vessel subtypes, rather than overall density, play a crucial role in immune response and disease progression, laying the groundwork for future studies on lymphovascular evolution in melanoma.
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Few-shot learning aims to identify unseen classes with limited labelled data. Recent few-shot learning techniques have shown success in generalizing to unseen classes; however, the performance of these techniques has also been shown to degrade when tested on an out-of-domain setting. Previous work, additionally, has also demonstrated increasing reliance on supervised finetuning in an off-line or online capacity.

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Background: We previously reported a higher incidence of a pathogenic germline variant in the kinase insert domain receptor (KDR) in melanoma patients compared to the general population. Here, we dissect the impact of this genotype on melanoma tumor growth kinetics, tumor phenotype, and response to treatment with immune checkpoint inhibitors (ICIs) or targeted therapy.

Methods: The KDR genotype was determined and the associations between the KDR Q472H variant (KDR-Var), angiogenesis, tumor immunophenotype, and response to MAPK inhibition or ICI treatment were examined.

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