72 results match your criteria: "University of the Witswatersrand[Affiliation]"

Realising agency: insights from participatory research with learners in a South African sexual and reproductive health programme.

Front Public Health

October 2024

Desmond Tutu HIV Centre, Department of Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa.

Background: Investing in the capabilities of adolescents is essential to achieving the United Nations Sustainable Development Goals, which focus on realising adolescent girls and young women's (AGYW) rights to education, health, bodily autonomy and integrity, sexual and reproductive health (SRH) and well-being. Despite significant scientific and programmatic progress in understanding and responding to their unique and intersecting vulnerabilities, AGYW continue to face disproportionate risk of STIs, HIV and early pregnancy. Health promotion and preventative interventions stand to be improved by early and meaningful engagement of AGYW in intervention design and delivery.

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Like the cerebralcortex, the surface of the cerebellum is repeatedly folded. Unlike the cerebralcortex, however, cerebellar folds are much thinner and more numerous; repeatthemselves largely along a single direction, forming accordion-like folds transverseto the mid-sagittal plane; and occur in all but the smallest cerebella. We haveshown previously that while the location of folds in mammalian cerebral cortex isclade-specific, the overall degree of folding strictly follows a universalpower law relating cortical thickness and the exposed and total surface areas predictedfrom the minimization of the effective free energy of an expanding, self-avoidingsurface of a certain thickness.

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Management of thoracoabdominal gunshot wounds - Experience from a major trauma centre in South Africa.

Injury

January 2024

Department of Surgery, University of the Witswatersrand, Johannesburg, South Africa; Department of Surgery, University of KwaZulu-Natal, Durban, South Africa.

Introduction: The management of thoracoabdominal (TA) gunshot wounds (GSW) remains challenging. This study reviewed our experience with treating such injuries over a decade.

Materials And Methods: A retrospective study was conducted at a major trauma centre in South Africa over a ten-year period from December 2012 to January 2022.

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Article Synopsis
  • Deafness impacts 5% of the global population, and current treatments for genetic hearing loss are largely lacking, particularly for disorders like Norrie disease, which is caused by mutations in the NDP gene and leads to dual sensory deprivation.
  • Researchers utilized a Norrie disease mouse model to test a gene therapy approach, delivering the human NDP cDNA through an adeno-associated viral vector (AAV)9 at various developmental stages.
  • Neonatal treatment showed promising results, preventing cochlear hair cell death and restoring both auditory function and retinal health, indicating potential for effective clinical therapy for Norrie disease-related hearing loss.
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Genomic investigations of unexplained acute hepatitis in children.

Nature

May 2023

Infection, Immunity and Inflammation Department, Great Ormond Street Institute of Child Health, University College London, London, UK.

Article Synopsis
  • Over 1,000 unexplained pediatric hepatitis cases have been identified globally, with a study focusing on 38 cases and various control groups to understand potential viral causes.
  • High levels of adeno-associated virus 2 (AAV2) DNA were found in most cases, while low levels of adenovirus and human herpesvirus 6B were also detected; however, AAV2 appeared infrequently in healthy controls even when they were immunocompromised.
  • The study suggests that abnormal replication of AAV2, potentially influenced by other viruses like HAdV and HHV-6B, may be responsible for immune-related liver disease in susceptible children.
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Article Synopsis
  • Adeno-associated viral vectors (AAVs) are important for gene therapy due to their efficiency and safety, but making them in large amounts is still a challenge.
  • This study introduces nanogels created using microfluidics as a cost-effective alternative to common reagents like polyethylenimine-MAX (PEI-MAX) for producing AAV vectors, achieving similar yields.
  • The experiments showed that nanogels can produce high yields of AAV vectors, with optimized formulations leading to comparable results to PEI-MAX, indicating a promising method for more efficient and affordable gene therapy production.
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HIV self-testing (HIVST) complements traditional HIV testing programmes by removing barriers and increasing access to testing for key populations, and digital interventions have been developed for HIVST to improve the testing and linkage to care experience for users. The first HIVST kit was proposed in 1986, but it took 10 years for the home sample collection (HSC) HIVST to become available and another 16 years for rapid diagnostic test HIVST to be approved by the Federal Drug Administration. Since then, studies have shown high usability and performance of HIVST, which led the World Health Organization formally recommending HIVST in 2016, and currently almost 100 countries have incorporated HIVST into their national testing strategy.

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The "Magude project" aimed but failed to interrupt local malaria transmission in Magude district, southern Mozambique, by using a comprehensive package of interventions, including indoor residual spraying (IRS), pyrethroid-only long-lasting insecticide treated nets (LLINs) and mass-drug administration (MDA). Here we present detailed information on the vector species that sustained malaria transmission, their association with malaria incidence and behaviors, and their amenability to the implemented control interventions. Mosquitoes were collected monthly between May 2015 and October 2017 in six sentinel sites in Magude district, using CDC light traps both indoors and outdoors.

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The Covid-19 pandemic inaugurated a new global order of public life and health marked by death, despair and alienation. As a crisis of a global scale, it made the task of (re)imagination simultaneously necessary and extremely difficult. It is this double bind of the difficulty and imminence of imagination that motivates the curation of this special issue.

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Article Synopsis
  • Lentiviral vectors (LV) are promising tools for gene therapy, but can lead to insertional mutagenesis, making it crucial to study their integration into host genomes.
  • The research focuses on how transcription factors (TF) may influence the process of LV integration by mapping predicted binding sites near the insertion points chosen by HIV-1 LV in human induced pluripotent stem cells and their derivatives.
  • Findings indicate that specific transcription factor binding sites (pTFBS) are enriched in the LV insertion sites and are essential for the HIV-1 life cycle, suggesting their importance in viral survival and propagation.
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The most diverse and abundant family of termites, the Termitidae, evolved in African tropical forests. They have since colonised grassy biomes such as savannas. These open environments have more extreme conditions than tropical forests, notably wider extremes of temperature and lower precipitation levels and greater temporal fluctuations (of both annual and diurnal variation).

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The sun is the most prominent source of directional information in the heading direction network of the diurnal, ball-rolling dung beetle Kheper lamarcki. If this celestial body is occluded from the beetle's field of view, the distribution of the relative weight between the directional cues that remain shifts in favour of the celestial pattern of polarised light. In this study, we continue to explore the interplay of the sun and polarisation pattern as directional cues in the heading direction network of K.

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Article Synopsis
  • * Traditional treatments, including ammonia scavengers and liver transplants, have risks and limitations, prompting interest in new gene therapies using adeno-associated viral (AAV) vectors.
  • * A study using juvenile monkeys showed that a liver-targeted AAV gene therapy (AAVLK03) was safe, well-tolerated, and effectively increased OTC levels, supporting its potential for treating severe OTCD in humans.
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Rapid and inexpensive purification of adenovirus vectors using an optimised aqueous two-phase technology.

J Virol Methods

January 2022

Division of Biosciences, Department of Life Sciences, College of Health, Medicine & Life Sciences, Brunel University London, Uxbridge, Middlesex, UK; Division of Ecology and Evolution, Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK. Electronic address:

Article Synopsis
  • * Traditional cell lysates require purification methods, like caesium chloride or chromatography, but have limitations such as poor infectiousness and restricted storage capability.
  • * An innovative aqueous two-phase system (ATPS) using 20% PEG 600 and 20% (NH)SO has been shown to efficiently purify AdVs, yielding over 97% high-titre virus with no cytotoxic effects, and stable storage at -20 °C or 4 °C for future clinical
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Background: The World Health Organization's "Coordinated Global Research Roadmap: 2019 Novel Coronavirus" outlined the need for research that focuses on the impact of COVID-19 on pregnant women and children. More than one year after the first reported case significant knowledge gaps remain, highlighting the need for a coordinated approach. To address this need, the Maternal, Newborn and Child Health Working Group (MNCH WG) of the COVID-19 Clinical Research Coalition conducted an international survey to identify global research priorities for COVID-19 in maternal, reproductive and child health.

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Article Synopsis
  • The human adenovirus family is divided into seven species, with species D showing promise for gene therapy due to low pre-existing immunity in the population.
  • Human adenovirus type 49 (HAdV-D49) was studied and found to utilize multiple pathways for cell entry, allowing it to infect a variety of cell types.
  • HAdV-D49 demonstrates reduced targeting of the liver compared to adenovirus type 5, making it a potentially effective vector for targeting the lung and spleen while minimizing liver interactions, which is beneficial for vaccine delivery.
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Cytomegalovirus-associated supraglottic mass in a patient on immunosuppressive therapy.

S Afr Med J

June 2021

Division of Infectious Diseases, Department of Medicine, School of Clinical Medicine, University of the Witswatersrand, Johannesburg, South Africa.

A 33-year-old woman on chronic immunosuppressive treatment for rheumatoid arthritis with a history of inhaled methamphetamine use presented with respiratory failure requiring mechanical ventilation for a prolonged period. After being given plasma exchange, pulses of methylprednisolone and a dose of cyclosporine for suspected ANCA (anti-neutrophilic cytoplasmic autoantibodies) vasculitis, she developed an obstructive supraglottic laryngeal mass that required a tracheostomy to bypass. Biopsy findings revealed the mass to be an inflammatory pseudomass secondary to cytomegalovirus (CMV).

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To guide their characteristic straight-line orientation away from the dung pile, ball-rolling dung beetles steer according to directional information provided by celestial cues, which, among the most relevant are the sun and polarised skylight. Most studies regarding the use of celestial cues and their influence on the orientation system of the diurnal ball-rolling beetle have been performed on beetles of the tribe Scarabaeini living in open habitats. These beetles steer primarily according to the directional information provided by the sun.

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Asymptomatic gametocyte carriers are reservoirs for sustaining transmission in malaria endemic regions. Gametocyte presence in the host peripheral blood is a predictor of capacity to transmit malaria. However, it does not always directly translate to mosquito infectivity.

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Re-structuring lentiviral vectors to express genomic RNA via cap-dependent translation.

Mol Ther Methods Clin Dev

March 2021

Gene Transfer Technology Group, Institute for Women's Health, University College London, 86-96 Chenies Mews, London, UK.

Article Synopsis
  • Lentiviral vectors derived from HIV-1 usually integrate their RNA genome into the host cell's DNA, leading to long-lasting gene expression, but integration-deficient versions have been created to minimize this persistence.
  • New research focuses on optimizing a reverse-transcriptase-deficient lentiviral vector that allows for the direct translation of RNA genomes in cells, bypassing the need for a DNA step.
  • This innovative LV design promotes efficient expression of genetic material without integration, making it promising for temporary gene expression in gene and cell therapy applications.
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Novel therapeutic and preventive strategies are needed to contain the HIV-1 epidemic. Broadly neutralizing human antibodies (bNAbs) with exceptional activity against HIV-1 are currently being tested in HIV-1 prevention trials. The selection of anti-HIV-1 bNAbs for clinical development was primarily guided by their neutralizing activity against HIV-1 Env pseudotyped viruses.

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Introduction: A vaginal ring containing 25 mg of the antiretroviral dapivirine has demonstrated efficacy in reducing women's risk of sexually acquiring HIV-1; however, imperfect ring use likely diluted efficacy estimates in clinical trials. The amount of dapivirine remaining in returned rings may reflect the extent of product use, permitting estimation of HIV protection in the context of consistent use.

Methods: We measured the amount of dapivirine in returned rings from a placebo-controlled trial of the dapivirine vaginal ring conducted between August 2012 and June 2015 among 2629 African women.

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Article Synopsis
  • Gaucher disease is caused by mutations in the GBA gene, leading to the accumulation of harmful substances in organs and sometimes the brain, with current treatments not addressing neurological issues.
  • Gene therapy has shown promise as a potential treatment for the more severe forms of Gaucher disease that affect the nervous system (nGD).
  • In a study, using an adeno-associated virus to deliver the human GBA gene improved the lifespan, reduced neurodegeneration, and improved movement and organ health in a mouse model of nGD, suggesting gene therapy could be a viable option for treating these severe symptoms.
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A series of 1-1,2,3-triazole-linked ospemifene-isatin and -methylated ospemifene-isatin conjugates were synthesized and assayed for their anti-proliferative activities against estrogen-responsive as well as estrogen-non-responsive cells. The non-cytotoxic conjugate 14e, with an optimal combination of bromo substituents at the C-5/C-7 positions of isatin, proved to be a promising hit with an IC value of 31.62 μM against MCF-7 and 19.

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