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1.
Front Allergy ; 5: 1437523, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-39183976

RESUMEN

IgE antibodies against the mammalian oligosaccharide allergen galactose-α-1,3-galactose (αGal) can result in a severe allergic disease known as alpha-gal syndrome (AGS). This syndrome, acquired by tick bites that cause αGal sensitization, leads to allergic reactions after ingestion of non-primate mammalian meat and mammalian-derived products that contain αGal. Allergen-specific immunotherapies for this tickborne allergic syndrome are understudied, as are the immune mechanisms of allergic desensitization that induce clinical tolerance to αGal. Here, we reveal that prophylactic administration of αGal glycoprotein-containing nanoparticles to mice prior to tick protein-induced αGal IgE sensitization blunts the production of Th2 cytokines IL-4, IL-5, and IL-13 in an αGal-dependent manner. Furthermore, these effects correlated with suppressed production of αGal-specific IgE and hypersensitivity reactions, as measured by reduced basophil activation and histamine release and the systemic release of mast cell protease-1 (MCPT-1). Therapeutic administration of two doses of αGal-containing nanoparticles to mice sensitized to αGal had partial efficacy by reducing the Th2 cytokine production, αGal-specific IgE production, and MCPT-1 release without reducing basophil activation or histamine release. These data identify nanoparticles carrying encapsulated αGal glycoprotein as a potential strategy for augmenting αGal-specific immune tolerance and reveal diverse mechanisms by which αGal nanoparticles modify immune responses for established αGal-specific IgE-mediated allergic reactions.

2.
Sci Rep ; 14(1): 16970, 2024 07 23.
Artículo en Inglés | MEDLINE | ID: mdl-39043800

RESUMEN

B cells and the antibodies they produce are critical in host defense against pathogens and contribute to various immune-mediated diseases. B cells responding to activating signals in vitro release extracellular vesicles (EV) that carry surface antibodies, yet B cell production of EVs that express antibodies and their function in vivo is incompletely understood. Using transgenic mice expressing the Cre recombinase in B cells switching to IgG1 to induce expression of fusion proteins between emerald green fluorescent protein (emGFP) and the EV tetraspanin CD63 as a model, we identify emGFP expression in B cells responding to foreign antigen in vivo and characterize the emGFP+ EVs they release. Our data suggests that emGFP+ germinal center B cells undergoing immunoglobulin class switching to express IgG and their progeny memory B cells and plasma cells, also emGFP+, are sources of circulating antigen-specific IgG+ EVs. Furthermore, using a mouse model of influenza virus infection, we find that IgG+ EVs specific for the influenza hemagglutinin antigen protect against virus infection. In addition, crossing the B cell Cre driver EV reporter mice onto the Nba2 lupus-prone strain revealed increased circulating emGFP+ EVs that expressed surface IgG against nuclear antigens linked to autoimmunity. These data identify EVs loaded with antibodies as a novel route for antibody secretion in B cells that contribute to adaptive immune responses, with important implications for different functions of IgG+ EVs in infection and autoimmunity.


Asunto(s)
Linfocitos B , Vesículas Extracelulares , Inmunoglobulina G , Ratones Transgénicos , Animales , Vesículas Extracelulares/inmunología , Vesículas Extracelulares/metabolismo , Inmunoglobulina G/inmunología , Inmunoglobulina G/metabolismo , Ratones , Linfocitos B/inmunología , Linfocitos B/metabolismo , Infecciones por Orthomyxoviridae/inmunología , Proteínas Fluorescentes Verdes/metabolismo , Proteínas Fluorescentes Verdes/genética , Antígenos/inmunología , Cambio de Clase de Inmunoglobulina , Ratones Endogámicos C57BL , Centro Germinal/inmunología , Centro Germinal/metabolismo
3.
Int J Mol Sci ; 25(5)2024 Feb 26.
Artículo en Inglés | MEDLINE | ID: mdl-38473933

RESUMEN

Loss of function of members of the muscleblind-like (MBNL) family of RNA binding proteins has been shown to play a key role in the spliceopathy of RNA toxicity in myotonic dystrophy type 1 (DM1), the most common muscular dystrophy affecting adults and children. MBNL1 and MBNL2 are the most abundantly expressed members in skeletal muscle. A key aspect of DM1 is poor muscle regeneration and repair, leading to dystrophy. We used a BaCl2-induced damage model of muscle injury to study regeneration and effects on skeletal muscle satellite cells (MuSCs) in Mbnl1∆E3/∆E3 and Mbnl2∆E2/∆E2 knockout mice. Similar experiments have previously shown deleterious effects on these parameters in mouse models of RNA toxicity. Muscle regeneration in Mbnl1 and Mbnl2 knockout mice progressed normally with no obvious deleterious effects on MuSC numbers or increased expression of markers of fibrosis. Skeletal muscles in Mbnl1∆E3/∆E3/ Mbnl2∆E2/+ mice showed increased histopathology but no deleterious reductions in MuSC numbers and only a slight increase in collagen deposition. These results suggest that factors beyond the loss of MBNL1/MBNL2 and the associated spliceopathy are likely to play a key role in the defects in skeletal muscle regeneration and deleterious effects on MuSCs that are seen in mouse models of RNA toxicity due to expanded CUG repeats.


Asunto(s)
Empalme Alternativo , Distrofia Miotónica , Humanos , Niño , Ratones , Animales , Distrofia Miotónica/genética , Músculo Esquelético/metabolismo , Ratones Noqueados , Modelos Animales de Enfermedad , ARN/metabolismo , Proteínas de Unión al ARN/metabolismo
4.
Reprod Health ; 20(1): 96, 2023 Jun 26.
Artículo en Inglés | MEDLINE | ID: mdl-37365630

RESUMEN

BACKGROUND: Many factors influence young women's choice of contraceptive methods and where to source them, yet less is known about whether one of these choices (method or source) is prioritized and the relationship between these choices. This study qualitatively explored decision-making around contraceptive method and source choice among young women in Kenya. METHODS: In August-September 2019, 30 in-depth interviews were conducted with women ages 18-24 who had used two or more contraceptive methods and resided in three counties: Nairobi, Mombasa or Migori. Participants were recruited from public and private health facilities and pharmacies. Interview guides captured information about decision-making processes for each contraceptive method the respondent had ever used. Responses were audio-recorded, transcribed, translated into English, coded, and analyzed thematically. RESULTS: The majority of respondents knew which method they wanted to use prior to seeking it from a source. This was true for all types of methods that women ever used. Of the small number of respondents who selected their source first, most were in the post-partum period or experiencing side effects and sought counseling at a source before choosing a method. CONCLUSIONS: This study highlights the importance of providing young women with high quality counseling that provides full information about contraceptive options and addresses that young women's needs vary along the reproductive health continuum of care. This will ensure that young women have information to inform future contraceptive decision-making prior to seeking care.


Asunto(s)
Conducta Anticonceptiva , Servicios de Planificación Familiar , Femenino , Humanos , Servicios de Planificación Familiar/métodos , Kenia , Investigación Cualitativa , Conducta Anticonceptiva/psicología , Anticoncepción/métodos , Anticonceptivos
5.
BMC Health Serv Res ; 22(1): 1477, 2022 Dec 03.
Artículo en Inglés | MEDLINE | ID: mdl-36463163

RESUMEN

BACKGROUND: Private health care facilities working in partnership with the public health sector is one option to create sustainable health systems and ensure health and well-being for all in low-income countries. As the second-most populous country in Africa with a rapidly growing economy, demand for health services in Ethiopia is increasing and one-quarter of its health facilities are privately owned. The Private Health Sector Program (PHSP), funded by the United States Agency for International Development, implemented a series of public-private partnership in health projects from 2004 to 2020 to address several public health priorities, including tuberculosis, malaria, HIV/AIDS, and family planning. We assessed PHSP's performance in leadership and governance, access to medicines, health management information systems, human resources, service provision, and finance. METHODS: The World Health Organization's health systems strengthening framework, which is organized around six health system building blocks, guided the assessment. We conducted 50 key informant interviews and a health facility assessment at 106 private health facilities supported by the PHSP to evaluate its performance. RESULTS: All six building blocks were addressed by the program and key informants shared that several policy and strategic changes were conducive to supporting the functioning of private health facilities. The provision of free medicines from the public pharmaceutical logistics system, relaxation of strict regulatory policies that restricted service provision through the private sector, training of private providers, and public-private mix guidelines developed for tuberculosis, malaria, and reproductive, maternal, newborn, child, and adolescent health helped increase the use of services at health facilities. CONCLUSIONS: Some challenges and threats to sustainability remain, including fragile partnerships between public and private bodies, resource constraints, mistrust between the public and private sectors, limited incentives for the private sector, and oversight of the quality of services. To continue with gains in the policy environment, service accessibility, and other aspects of the health system, the government and international communities must work collaboratively to address public-private partnerships in health areas that can be strengthened. Future efforts should emphasize a mechanism to ensure that the private sector is capable, incentivized, and supervised to deliver continuous, high-quality and equitable services.


Asunto(s)
Gobierno , Instalaciones Privadas , Adolescente , Niño , Recién Nacido , Humanos , Etiopía , Programas de Gobierno , Instituciones de Salud
6.
Front Sociol ; 7: 866254, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-36340618

RESUMEN

Despite high knowledge of family planning (FP) among Nigerian women, use of modern contraceptives remains low. While FP investments in Nigeria have been ongoing for decades, relatively little emphasis on contextual and structural factors may have contributed to low demand for and use of contraception. From 2009 to 2014, the Bill & Melinda Gates Foundation (BMGF) supported the Nigerian Urban Reproductive Health Initiative (NURHI) with the aim of increasing voluntary use of contraceptives among women ages 15-49 years in six Nigerian cities. A subsequent phase of NURHI was implemented in three states for the next 3 to 5 years. Using cross-sectional survey data from three cities (two exposed to NURHI, one not exposed), this study examines whether social norms around FP were related to women's use of modern contraception, and whether the relationship differed by varying levels of exposure to the program (i.e., by city). We identified three distinct FP social norms through factor analysis: norms around delaying first pregnancy; spacing or limiting pregnancies; and using contraception when the husband disagrees. Using structural equation modeling, we found that FP social norms are related to use of modern contraceptive methods, and the relationship varies by city and norm type. The observed differences suggest that this relationship depends on numerous factors at the individual, interpersonal and societal level, and this may include malleable factors influenced by the NURHI program.

7.
Front Glob Womens Health ; 3: 973971, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-36177336

RESUMEN

Background: Many young women experience important key life transitions during adolescence and early adulthood, such as initiation of sexual activity, first use of contraceptives, marriage, and childbirth. For young women to be able to plan and manage their lives, it is critical to understand how these life events intersect and shape their contraceptive decision-making. This study aims to explore young women's contraceptive method use trajectories, including the factors that influence contraceptive decision-making throughout adolescence and youth. Methodology: In 2019, the Full Access, Full Choice project (FAFC), implemented by the University of North Carolina at Chapel Hill and the African Institute for Development Policy, conducted 30 in-depth interviews with young women aged 18-24 years in three counties in Kenya (Nairobi, Mombasa and Migori). Eligible respondents had used two or more modern contraceptive methods. Interview guides utilized a modified life history approach to capture details about respondents' contraceptive use and life experiences from the time they first used contraception until the time of interview. Results: We identified five separate contraceptive use trajectories based on the occurrence and timing of marriage, childbirth, and contraceptive method choice as well as various influences on contraceptive decision-making. The majority of respondents began their contraceptive journey by using male condoms or emergency contraception, but subsequent contraceptive decisions were varied across trajectories and influenced by different factors. For many women, the initiation of a non-coitally dependent method occurred after the birth of a child; for some, this was the first method used. Once women transitioned to using a non-coitally dependent method such as injectables or implants, many cycled through different methods to find one that had fewer side effects or provided the desired duration of protection. Discussion: This study highlights the nuanced needs of young women throughout their adolescent and youth years in Kenya. This suggests that programs and policies need to encompass young women's diversity of experiences and motivations to best serve them.

8.
Glob Public Health ; 17(7): 1379-1391, 2022 07.
Artículo en Inglés | MEDLINE | ID: mdl-34032182

RESUMEN

Understanding the mechanisms through which social norms shape contraceptive use can help prevent unintended pregnancies in low-income countries. The Nigerian Urban Reproductive Health Initiative (NURHI) aimed to increase contraceptive uptake through advocacy, service delivery, and demand generation. Using data from focus group discussions, we examined whether social norms around family planning (FP), and specifically use of modern contraception (MC), varied among women and girls of reproductive age exposed to varying levels of the programme in three Nigerian cities. Injunctive social norms were generally unfavourable of unmarried adolescent girls' use of MC, though participants often shared exceptions for certain types of adolescents whose use of MC would be acceptable. There was greater acceptability for MC use by women who wanted to space or limit pregnancies. Participants reported that norms around FP and MC use have become more accepting in their communities over time. Normative differences between cities were identified. Participants' perceptions of religious leaders' support for FP use may have contributed to positively influencing social norms.


Asunto(s)
Conducta Anticonceptiva , Servicios de Planificación Familiar , Adolescente , Ciudades , Anticoncepción , Anticonceptivos , Femenino , Humanos , Nigeria , Embarazo , Normas Sociales
9.
Int J Mol Sci ; 22(21)2021 Nov 02.
Artículo en Inglés | MEDLINE | ID: mdl-34769305

RESUMEN

Myotonic dystrophy type 1 (DM1), the most common muscular dystrophy affecting adults and children, is a multi-systemic disorder affecting skeletal, cardiac, and smooth muscles as well as neurologic, endocrine and other systems. This review is on the cardiac pathology associated with DM1. The heart is one of the primary organs affected in DM1. Cardiac conduction defects are seen in up to 75% of adult DM1 cases and sudden death due to cardiac arrhythmias is one of the most common causes of death in DM1. Unfortunately, the pathogenesis of cardiac manifestations in DM1 is ill defined. In this review, we provide an overview of the history of cardiac studies in DM1, clinical manifestations, and pathology of the heart in DM1. This is followed by a discussion of emerging data about the utility of cardiac magnetic resonance imaging (CMR) as a biomarker for cardiac disease in DM1, and ends with a discussion on models of cardiac RNA toxicity in DM1 and recent clinical guidelines for cardiologic management of individuals with DM1.


Asunto(s)
Músculos/patología , Distrofia Miotónica/etiología , Distrofia Miotónica/patología , Animales , Humanos , Distrofia Miotónica/clasificación
10.
Hum Mol Genet ; 30(12): 1111-1130, 2021 06 09.
Artículo en Inglés | MEDLINE | ID: mdl-33864373

RESUMEN

RNA toxicity underlies the pathogenesis of disorders such as myotonic dystrophy type 1 (DM1). Muscular dystrophy is a key element of the pathology of DM1. The means by which RNA toxicity causes muscular dystrophy in DM1 is unclear. Here, we have used the DM200 mouse model of RNA toxicity due to the expression of a mutant DMPK 3'UTR mRNA to model the effects of RNA toxicity on muscle regeneration. Using a BaCl2-induced damage model, we find that RNA toxicity leads to decreased expression of PAX7, and decreased numbers of satellite cells, the stem cells of adult skeletal muscle (also known as MuSCs). This is associated with a delay in regenerative response, a lack of muscle fiber maturation and an inability to maintain a normal number of satellite cells. Repeated muscle damage also elicited key aspects of muscular dystrophy, including fat droplet deposition and increased fibrosis, and the results represent one of the first times to model these classic markers of dystrophic changes in the skeletal muscles of a mouse model of RNA toxicity. Using a ligand-conjugated antisense (LICA) oligonucleotide ASO targeting DMPK sequences for the first time in a mouse model of RNA toxicity in DM1, we find that treatment with IONIS 877864, which targets the DMPK 3'UTR mRNA, is efficacious in correcting the defects in regenerative response and the reductions in satellite cell numbers caused by RNA toxicity. These results demonstrate the possibilities for therapeutic interventions to mitigate the muscular dystrophy associated with RNA toxicity in DM1.


Asunto(s)
Desarrollo de Músculos/genética , Distrofia Miotónica/genética , Proteína Quinasa de Distrofia Miotónica/genética , Oligonucleótidos Antisentido/farmacología , ARN/genética , Animales , Modelos Animales de Enfermedad , Humanos , Ratones , Músculo Esquelético/crecimiento & desarrollo , Músculo Esquelético/metabolismo , Músculo Esquelético/patología , Distrofia Miotónica/patología , Proteína Quinasa de Distrofia Miotónica/antagonistas & inhibidores , ARN/toxicidad , ARN Mensajero/genética , Regeneración/genética
11.
Open AIDS J ; 14: 75-83, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-33362883

RESUMEN

BACKGROUND: Young people in KwaZulu-Natal and Mpumalanga South Africa are at high risk of HIV and other sexually transmitted infections. Programs are needed to reach these young people and change their knowledge, attitudes, and behaviors. OBJECTIVE: The objective of this study is to use cross-sectional data from grade 10 female and male learners in randomly assigned intervention and control schools to examine knowledge, attitudes, and sexual behaviors. METHODS: Participants were in grade 10 in the 2018 school year and were attending schools randomly assigned to the intervention and control arms for implementation of the Department of Basic Education's adapted life orientation curriculum that included scripted lesson plans. The study took place in two high HIV prevalence provinces in South Africa. Participants completed self-administered tablet-based surveys and female participants provided a dried blood spot for HIV testing. RESULTS: Results demonstrate that two-fifths to one-half of male learners reported being sexually experienced and a quarter (KwaZulu-Natal) to a third (Mpumalanga) of the female learners reported the same. A greater percentage of learners in Mpumalanga reported consistent condom use than learners in KwaZulu-Natal. HIV prevalence among female grade 10 learners in both provinces was about 6-7%. No notable differences are observed between intervention and control school learners on the knowledge, attitudes, and behavior outcomes. CONCLUSION: The findings demonstrate the importance of developing HIV prevention programs for young people in high HIV prevalence provinces since these young people remain at high risk for HIV and other negative outcomes. TRIAL REGISTRATION: This study has been registered at ClinicalTrials.gov. The trial registration number is: NCT04205721. The trial was retrospectively registered on December 18, 2019.

13.
BMC Public Health ; 20(1): 1542, 2020 Oct 14.
Artículo en Inglés | MEDLINE | ID: mdl-33054742

RESUMEN

BACKGROUND: Young people under age 25 years are a key population at risk of unintended pregnancies, HIV and other sexually transmitted infections. School-based programming, focusing on youth under 17 years is strategic given that many in this age group are in school or are required to be in school and spend a considerable amount of their time at school. Prior evaluations of school-based HIV prevention programs for young people often employed weak study designs or lacked biomarkers (e.g., HIV or STI testing) to inform outcomes. METHODS: This study used longitudinal data collected in 2016 from a cohort of grade-8 girls from Mpumalanga and KwaZulu-Natal Provinces in South Africa. We followed them for 2 years to examine the impact of the South African Department of Basic Education's revised scripted lesson plans for the HIV and sexual content of a "life orientation" curriculum on knowledge, attitudes, condom use behaviors, pregnancy incidence, and genital herpes incidence. Schools were randomized to intervention and control arms. Multivariable analyses were undertaken using hazard modeling for incidence-based outcomes (genital herpes and pregnancy) and generalized linear latent and mixed modeling for outcomes measured at each time period (knowledge, attitudes, and condom use). RESULTS: At end line, 105 schools were included from the two provinces (44 from Mpumalanga and 61 from KwaZulu-Natal). Fifty-five were intervention and fifty were control schools. A total of 2802 girls were surveyed at both time periods (1477 intervention and 1325 control). At baseline, participating girls were about 13.6 years; by end line, they were about 2 years older. Longitudinal data demonstrated few differences between intervention and control groups on knowledge, attitudes, condom use, genital herpes, and pregnancy experience. Monitoring data demonstrated that the program was not implemented as intended. Our results demonstrated 7% incidence of genital herpes in the two-year follow-up period indicating sexual risk-taking among our cohort. CONCLUSIONS: We did not find significant effects of the revised life orientation curriculum on key outcomes; however, this may reflect poor implementation. Future HIV prevention programs for young people need to be implemented with fidelity to ensure they meet the crucial needs of the next generation. TRIAL REGISTRATION: This study has been registered at ClinicalTrials.gov . The trial registration number is: NCT04205721 . The trial was retrospectively registered on December 18, 2019.


Asunto(s)
Curriculum , Infecciones por VIH , Enfermedades de Transmisión Sexual , Adolescente , Niño , Femenino , Infecciones por VIH/epidemiología , Infecciones por VIH/prevención & control , Humanos , Masculino , Embarazo , Sexo Seguro , Conducta Sexual , Sudáfrica/epidemiología
14.
Hum Mol Genet ; 29(9): 1440-1453, 2020 06 03.
Artículo en Inglés | MEDLINE | ID: mdl-32242217

RESUMEN

Myotonic dystrophy type 1 (DM1), the most common adult muscular dystrophy, is an autosomal dominant disorder caused by an expansion of a (CTG)n tract within the 3' untranslated region (3'UTR) of the dystrophia myotonica protein kinase (DMPK) gene. Mutant DMPK mRNAs are toxic, present in nuclear RNA foci and correlated with a plethora of RNA splicing defects. Cardinal features of DM1 are myotonia and cardiac conduction abnormalities. Using transgenic mice, we have demonstrated that expression of the mutant DMPK 3'UTR is sufficient to elicit these features of DM1. Here, using these mice, we present a study of systemic treatment with an antisense oligonucleotide (ASO) (ISIS 486178) targeted to a non-CUG sequence within the 3'UTR of DMPK. RNA foci and DMPK 3'UTR mRNA levels were reduced in both the heart and skeletal muscles. This correlated with improvements in several splicing defects in skeletal and cardiac muscles. The treatment reduced myotonia and this correlated with increased Clcn1 expression. Furthermore, functional testing showed improvements in treadmill running. Of note, we demonstrate that the ASO treatment reversed the cardiac conduction abnormalities, and this correlated with restoration of Gja5 (connexin 40) expression in the heart. This is the first time that an ASO targeting a non-CUG sequence within the DMPK 3'UTR has demonstrated benefit on the key DM1 phenotypes of myotonia and cardiac conduction defects. Our data also shows for the first time that ASOs may be a viable option for treating cardiac pathology in DM1.


Asunto(s)
Canales de Cloruro/genética , Conexinas/genética , Distrofia Miotónica/genética , Proteína Quinasa de Distrofia Miotónica/genética , Oligonucleótidos Antisentido/farmacología , Regiones no Traducidas 3'/genética , Animales , Núcleo Celular/genética , Modelos Animales de Enfermedad , Humanos , Ratones , Ratones Transgénicos/genética , Distrofia Miotónica/patología , Distrofia Miotónica/terapia , Proteína Quinasa de Distrofia Miotónica/farmacología , Oligonucleótidos/genética , Oligonucleótidos/farmacología , Oligonucleótidos Antisentido/efectos adversos , Oligonucleótidos Antisentido/genética , ARN Mensajero/genética , Expansión de Repetición de Trinucleótido/genética , Proteína alfa-5 de Unión Comunicante
15.
Glob Health Sci Pract ; 7(3): 435-446, 2019 09.
Artículo en Inglés | MEDLINE | ID: mdl-31558599

RESUMEN

Adolescent girls and young women (AGYW) ages 15-24 years are disproportionately affected by HIV/AIDS, particularly in East and Southern Africa. One strategy to reduce HIV among AGYW, proposed through the Determined, Resilient, Empowered, AIDS-free, Mentored, and Safe (DREAMS) Initiative, is to prevent and manage HIV among their male sexual partners. To implement this strategy and reach men, programs need information about AGYW's potential sexual partners at the local level. To support DREAMS programming in Mozambique, we undertook a study to characterize this population of men in 3 districts with ongoing DREAMS programming. In mid-2017 we conducted 15 focus group discussions with AGYW (N=102) and a venue-based intercept survey of men (N=1,140). Male sexual partners of AGYW who took the survey were diverse in age, education level, and socioeconomic status. Older AGYW focus group participants sought partners who could provide for them financially. Multiple sexual partnerships and inconsistent condom use were widely reported, with AGYW emphasizing that gender norms disempowered them from negotiating condom use. Reported condom use varied by AGYW and male-partner demographic characteristics, as well as by their relationship type. Condom use rates were much higher than national and regional estimates. AGYW who were less educated/not-in-school, were pregnant, or single mothers were particularly disempowered in sexual relationships. Less educated men were less likely to use condoms than educated men, and condom use was least likely in marriage. Study findings underscore the importance of reaching the diversity of male sexual partners of AGYW with HIV services as part of a strategy to reduce HIV risk among AGYW. They also support an enhanced focus on female-controlled HIV prevention methods that do not require negotiation with a male partner and special efforts to reach out-of-school/less educated AGYW, as well as pregnant AGYW and single mothers.


Asunto(s)
Infecciones por VIH/epidemiología , Parejas Sexuales , Salud de la Mujer/estadística & datos numéricos , Adolescente , Adulto , Condones/estadística & datos numéricos , Femenino , Grupos Focales , Humanos , Masculino , Persona de Mediana Edad , Mozambique/epidemiología , Factores de Riesgo , Adulto Joven
16.
Hum Mol Genet ; 28(14): 2330-2338, 2019 07 15.
Artículo en Inglés | MEDLINE | ID: mdl-30997488

RESUMEN

Myotonic dystrophy type 1 (DM1) is caused by an expanded (CTG)n tract in the 3'UTR of the DM protein kinase (DMPK) gene. The RNA transcripts produced from the expanded allele sequester or alter the function of RNA-binding proteins (MBNL1, CUGBP1, etc.). The sequestration of MBNL1 results in RNA-splicing defects that contribute to disease. Overexpression of MBNL1 in skeletal muscle has been shown to rescue some of the DM1 features in a mouse model and has been proposed as a therapeutic strategy for DM1. Here, we sought to confirm if overexpression of MBNL1 rescues the phenotypes in a different mouse model of RNA toxicity. Using an inducible mouse model of RNA toxicity in which expression of the mutant DMPK 3'UTR results in RNA foci formation, MBNL1 sequestration, splicing defects, myotonia and cardiac conduction defects, we find that MBNL1 overexpression did not rescue skeletal muscle function nor beneficially affect cardiac conduction. Surprisingly, MBNL1 overexpression also did not rescue myotonia, though variable rescue of Clcn1 splicing and other splicing defects was seen. Additionally, contrary to the previous study, we found evidence for increased muscle histopathology with MBNL1 overexpression. Overall, we did not find evidence for beneficial effects from overexpression of MBNL1 as a means to correct RNA toxicity mediated by mRNAs containing an expanded DMPK 3'UTR.


Asunto(s)
Músculo Esquelético/metabolismo , Distrofia Miotónica/genética , Proteínas de Unión al ARN/genética , Regiones no Traducidas 3' , Empalme Alternativo , Animales , Proteínas de Unión al ADN/genética , Proteínas de Unión al ADN/metabolismo , Modelos Animales de Enfermedad , Humanos , Ratones , Ratones Transgénicos , Músculo Esquelético/citología , Distrofia Miotónica/metabolismo , Proteína Quinasa de Distrofia Miotónica/genética , Fenotipo , Empalme del ARN , ARN Mensajero/genética , Proteínas de Unión al ARN/metabolismo
17.
AIDS Educ Prev ; 30(2): 152-168, 2018 04.
Artículo en Inglés | MEDLINE | ID: mdl-29688772

RESUMEN

In South Africa, adolescents and young adults (ages 15-24) are at risk of HIV, sexually transmitted infections, and unintended pregnancies. Recently, the Department of Basic Education has revised its sexuality education content and teaching strategies (using scripted lessons plans) as part of its life orientation curriculum. This paper presents the methodology and baseline results from the evaluation of the scripted lesson plans and supporting activities. A rigorous cluster-level randomized design with random assignment of schools as clusters is used for the evaluation. Baseline results from grade 8 female and male learners and grade 10 female learners demonstrate that learners are at risk of HIV and early and unintended pregnancies. Multivariable analyses demonstrate that household-level food insecurity and living with an HIV-positive person are associated with sexual experience and pregnancy experience. Implications are discussed for strengthening the current life orientation program for future scale-up by the government of South Africa.


Asunto(s)
Curriculum , Infecciones por VIH/prevención & control , Embarazo en Adolescencia/prevención & control , Educación Sexual/métodos , Enfermedades de Transmisión Sexual/prevención & control , Adolescente , Femenino , Abastecimiento de Alimentos , Humanos , Embarazo , Evaluación de Programas y Proyectos de Salud , Instituciones Académicas , Conducta Sexual , Sexualidad , Sudáfrica , Adulto Joven
18.
AIDS Behav ; 22(4): 1253-1264, 2018 04.
Artículo en Inglés | MEDLINE | ID: mdl-29273945

RESUMEN

Structural interventions alter the social, economic, legal, political, and built environments that underlie processes affecting population health. We conducted a systematic review of evaluations of structural interventions for HIV prevention in low- and middle-income countries (LMICs) to better understand methodological and other challenges and identify effective evaluation strategies. We included 27 peer-reviewed articles on interventions related to economic empowerment, education, and substance abuse in LMICs. Twenty-one evaluations included clearly articulated theories of change (TOCs); 14 of these assessed the TOC by measuring intermediary variables in the causal pathway between the intervention and HIV outcomes. Although structural interventions address complex interactions, no evaluation included methods designed to evaluate complex systems. To strengthen evaluations of structural interventions, we recommend clearly articulating a TOC and measuring intermediate variables between the predictor and outcome. We additionally recommend adapting study designs and analytic methods outside traditional epidemiology to better capture complex results, influences external to the intervention, and unintended consequences.


Asunto(s)
Atención a la Salud/organización & administración , Infecciones por VIH/prevención & control , Pobreza , Países en Desarrollo , Humanos , Poder Psicológico
19.
BMC Pregnancy Childbirth ; 17(Suppl 2): 342, 2017 Nov 08.
Artículo en Inglés | MEDLINE | ID: mdl-29143636

RESUMEN

BACKGROUND: Evidence suggests that gender-integrated interventions, which actively seek to identify and integrate activities that address the role of gender norms and dynamics, improve family planning (FP) and maternal health (MH). To understand the link between the gender components of interventions and FP and MH outcomes, it is critical to examine the gender measures used in evaluations. METHODS: We conducted a systematic review of evaluations of gender-integrated FP and MH interventions in low- and middle-income countries. We examine characteristics of the interventions and their evaluations, and summarize women's empowerment and related gender measures. RESULTS: Out of 16 evaluation articles, five reported the theoretical or conceptual model that guided the intervention. Twelve described how gender was quantitatively measured and identified 13 women's empowerment and related gender constructs. Gender scales or indexes were used in five evaluations, three of which noted that their scales had been validated. Less than one third of articles reported examining the effect of gender on FP or MH. CONCLUSIONS: Evaluations of gender-integrated FP and MH interventions do not consistently describe how gender influences FP and MH outcomes or include validated gender measures within their studies. As a result, examining the pathways through which interventions empower women and the manner in which women's empowerment leads to changes in FP and MH outcomes remains a challenge. Valid measures of commonly reported women's empowerment and gender constructs, such as gender-equitable attitudes and women's decision-making power, must be adapted and used within evaluations to examine how empowerment and improvements in gender-related factors can produce positive FP and MH outcomes.


Asunto(s)
Países en Desarrollo , Servicios de Planificación Familiar , Relaciones Interpersonales , Poder Psicológico , Evaluación de Programas y Proyectos de Salud , Adulto , Toma de Decisiones , Femenino , Humanos , Embarazo , Adulto Joven
20.
Glob Public Health ; 12(11): 1335-1350, 2017 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-26948380

RESUMEN

As a result of new global priorities, there is a growing need for high-quality evaluations of gender-integrated health programmes. This systematic review examined 99 peer-reviewed articles on evaluations of gender-integrated (accommodating and transformative) health programmes with regard to their theory of change (ToC), study design, gender integration in data collection, analysis, and gender measures used. Half of the evaluations explicitly described a ToC or conceptual framework (n = 50) that guided strategies for their interventions. Over half (61%) of the evaluations used quantitative methods exclusively; 11% used qualitative methods exclusively; and 28% used mixed methods. Qualitative methods were not commonly detailed. Evaluations of transformative interventions were less likely than those of accommodating interventions to employ randomised control trials. Two-thirds of the reviewed evaluations reported including at least one specific gender-related outcome (n = 18 accommodating, n = 44 transformative). To strengthen evaluations of gender-integrated programmes, we recommend use of ToCs, explicitly including gender in the ToC, use of gender-sensitive measures, mixed-method designs, in-depth descriptions of qualitative methods, and attention to gender-related factors in data collection logistics. We also recommend further research to develop valid and reliable gender measures that are globally relevant.


Asunto(s)
Atención a la Salud , Países en Desarrollo , Pobreza , Femenino , Humanos , Masculino , Factores Sexuales
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