Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 74
Filtrar
Mais filtros

Base de dados
País/Região como assunto
Tipo de documento
Intervalo de ano de publicação
1.
Sex Transm Infect ; 100(2): 91-97, 2024 Feb 19.
Artigo em Inglês | MEDLINE | ID: mdl-38302411

RESUMO

OBJECTIVES: Prompt HIV and STI diagnosis and treatment is a public health priority and relies on accessible testing. Technology-based approaches to distribute test kits have the potential to increase access to testing. We evaluated the acceptability and uptake of vending machines in publicly available settings in Brighton and Hove (BH) and Bristol, North Somerset and South Gloucestershire (BNSSG), to distribute HIV rapid self-test and STI self-sample kits. METHODS: Seven machines were installed in BH and four in BNSSG. User characteristics, proportion of kits returned and test results, taken from the machine database and clinic records, combined with online questionnaires completed by self-recruited users and analysed using Stata and SPSS. RESULTS: 2536 kits were dispensed over 12 months (April 2022 to March 2023). The STI self-sample kits were most popular (74% of vends). 78% of kits dispensed were among users aged 16-35 years and 56% identified as male. 68% and 59% of users had either not tested in the last 12 months or never tested for HIV and STIs, respectively. 51% of STI kits were returned via post, lower than the local online service (65%). 208 users completed questionnaires. Convenience, desire for instant access and increased confidentiality were the most common reasons for using machines. 92% of respondents thought the machines were user-friendly and 97% would recommend the service. Concerns about safety and privacy while using the machine were reported by 42% and 66% of respondents. CONCLUSIONS: This study demonstrates that vending machines are an acceptable and effective means of accessing infrequent or never testers in the general population and can act as a horizontal intervention to tackle HIV and STIs. Research is needed to understand optimal machine locations to assure privacy and safety along with the long-term impact on sexual health services.


Assuntos
Infecções por HIV , Doença Pulmonar Obstrutiva Crônica , Infecções Sexualmente Transmissíveis , Humanos , Masculino , Infecções por HIV/diagnóstico , Infecções por HIV/prevenção & controle , Cidades , Infecções Sexualmente Transmissíveis/diagnóstico , Kit de Reagentes para Diagnóstico , Reino Unido
2.
BMC Womens Health ; 23(1): 241, 2023 05 09.
Artigo em Inglês | MEDLINE | ID: mdl-37161454

RESUMO

BACKGROUND: Bacterial vaginosis is a common and distressing condition for women. Short-term antibiotic treatment is usually clinically effective, but recurrence is common. We assessed the effectiveness of intravaginal lactic acid gel versus oral metronidazole for treating recurrent bacterial vaginosis. METHODS: We undertook an open-label, multicentre, parallel group, randomised controlled trial in nineteen UK sexual health clinics and a university health centre. Women aged ≥ 16 years, with current bacterial vaginosis symptoms and a preceding history of bacterial vaginosis, were randomised in a 1:1 ratio using a web-based minimisation algorithm, to 400 mg twice daily oral metronidazole tablets or 5 ml once daily intravaginal lactic acid gel, for 7 days. Masking of participants was not possible. The primary outcome was participant-reported resolution of symptoms within 2 weeks. Secondary outcomes included time to first recurrence of symptoms, number of recurrences and repeat treatments over 6 months and side effects. RESULTS: Five hundred and eighteen participants were randomised before the trial was advised to stop recruiting by the Data Monitoring Committee. Primary outcome data were available for 79% (204/259) allocated to metronidazole and 79% (205/259) allocated to lactic acid gel. Resolution of bacterial vaginosis symptoms within 2 weeks was reported in 70% (143/204) receiving metronidazole versus 47% (97/205) receiving lactic acid gel (adjusted risk difference -23·2%; 95% confidence interval -32.3 to -14·0%). In those participants who had initial resolution and for whom 6 month data were available, 51 of 72 (71%) women in the metronidazole group and 32 of 46 women (70%) in the lactic acid gel group had recurrence of symptoms, with median times to first recurrence of 92 and 126 days, respectively. Reported side effects were more common following metronidazole than lactic acid gel (nausea 32% vs. 8%; taste changes 18% vs. 1%; diarrhoea 20% vs. 6%, respectively). CONCLUSIONS: Metronidazole was more effective than lactic acid gel for short-term resolution of bacterial vaginosis symptoms, but recurrence is common following both treatments. Lactic acid gel was associated with fewer reported side effects. TRIAL REGISTRATION: ISRCTN14161293 , prospectively registered on 18th September 2017.


Assuntos
Efeitos Colaterais e Reações Adversas Relacionados a Medicamentos , Vaginose Bacteriana , Humanos , Feminino , Masculino , Metronidazol/uso terapêutico , Vaginose Bacteriana/tratamento farmacológico , Instituições de Assistência Ambulatorial , Ácido Láctico
3.
HIV Med ; 23(7): 790-796, 2022 08.
Artigo em Inglês | MEDLINE | ID: mdl-35094467

RESUMO

OBJECTIVES: To describe the impact that the COVID-19 pandemic has had on HIV testing in Brighton and Hove, United Kingdom. METHODS: All HIV tests performed in Brighton and Hove from January 2016 to June 2021 were extracted, de-duplicated and anonymized. Analysis was performed to compare the monthly numbers of tests and diagnoses before and during the pandemic across different services. RESULTS: The number of patients having tests for HIV in sexual health services (SHS) decreased by 64% in April 2020, followed by a recovery to baseline levels by the start of 2021. Similarly, the monthly number of diagnoses decreased drastically after April 2020, with almost half of diagnoses made by SHS in 2020 occurring in the three pre-pandemic months of the year. 'Self-sampling', used more by women and younger patients, has contributed significantly to the recovery. The number of patients tested in secondary care was seemingly unaffected by the pandemic. However, testing numbers were reduced in specialist services, whereas in the emergency department (ED) testing increased four-fold (most notably in the elderly) without finding any cases. General practice saw decreases in both the number of HIV tests performed and the number of new diagnoses made, which had not returned to baseline by June 2021. DISCUSSION: The COVID-19 pandemic has had a large impact on the number of HIV tests performed in Brighton and Hove with sizeable decreases in the number of patients tested likely leading to 'missed' diagnoses. By June 2021 testing had still not returned to normal across the city.


Assuntos
COVID-19 , Infecções por HIV , Idoso , COVID-19/diagnóstico , COVID-19/epidemiologia , Feminino , Infecções por HIV/diagnóstico , Infecções por HIV/epidemiologia , Teste de HIV , Humanos , Pandemias , Reino Unido/epidemiologia
4.
Plant Cell Physiol ; 62(12): 1847-1857, 2021 Dec 27.
Artigo em Inglês | MEDLINE | ID: mdl-34195842

RESUMO

In plants, the diaspore (seed dispersal unit) may include a seed coat and/or pericarp to protect the embryo and assist in dispersion. In many species, the seed coat and/or pericarp secrete a gelatinous mixture of cell wall polysaccharides known as mucilage. In several species, mucilage synthesis, secretion and modification have been studied extensively as model systems for the investigation of plant cell wall structure and function. Despite this, efforts toward understanding the role of mucilage have received less attention. Mucilage has been hypothesized to impact seed dispersal through interaction with soil, protecting the seed in the gut following ingestion by animals or affecting the ability of seeds to sink or float in water. Mucilage has been found to influence seed germination and seedling establishment, most often during abiotic stress, probably by maintaining seed hydration when water is scarce. Finally, mucilage has been documented to mediate interactions with various organisms. Advances in transgenic technology should enable the genetic modification of mucilage structure and function in crop plants. Cells synthesizing mucilage may also be a suitable platform for creating custom polysaccharides or proteins with industrial applications. Thus, in the near future, it is likely that research on seed mucilage will expand well beyond the current focus. Here we summarize our understanding of the biological functions of mucilage and provide an outlook on the future of mucilage research.


Assuntos
Biotecnologia , Mucilagem Vegetal/metabolismo , Plantas/metabolismo , Sementes/metabolismo , Parede Celular/metabolismo
5.
Plant Cell Physiol ; 62(12): 1912-1926, 2021 Dec 27.
Artigo em Inglês | MEDLINE | ID: mdl-34059917

RESUMO

The cell wall is essential for plant survival. Determining the relationship between cell wall structure and function using mutant analysis or overexpressing cell wall-modifying enzymes has been challenging due to the complexity of the cell wall and the appearance of secondary, compensatory effects when individual polymers are modified. In addition, viability of the plants can be severely impacted by wall modification. A useful model system for studying structure-function relationships among extracellular matrix components is the seed coat epidermal cells of Arabidopsis thaliana. These cells synthesize relatively simple, easily accessible, pectin-rich mucilage that is not essential for plant viability. In this study, we expressed enzymes predicted to modify polysaccharide components of mucilage in the apoplast of seed coat epidermal cells and explored their impacts on mucilage. The seed coat epidermal-specific promoter TESTA ABUNDANT2 (TBA2) was used to drive expression of these enzymes to avoid adverse effects in other parts of the plant. Mature transgenic seeds expressing Rhamnogalacturonate lyase A (RglA) or Rhamnogalacturonate lyase B (RglB) that degrade the pectin rhamnogalacturonan-I (RG-I), a major component of mucilage, had greatly reduced mucilage capsules surrounding the seeds and concomitant decreases in the monosaccharides that comprise the RG-I backbone. Degradation of the minor mucilage component homogalacturonan (HG) using the HG-degrading enzymes Pectin lyase A (PLA) or ARABIDOPSIS DEHISCENCE ZONE POLYGALACTURONASE2 (ADPG2) resulted in developing seed coat epidermal cells with disrupted cell-cell adhesion and signs of early cell death. These results demonstrate the feasibility of manipulating the seed coat epidermal cell extracellular matrix using a targeted genetic engineering approach.


Assuntos
Proteínas de Arabidopsis/genética , Arabidopsis/metabolismo , Pectinas/metabolismo , Mucilagem Vegetal/metabolismo , Arabidopsis/enzimologia , Proteínas de Arabidopsis/metabolismo , Sementes/química
6.
Plant Cell Physiol ; 62(12): 1927-1943, 2021 Dec 27.
Artigo em Inglês | MEDLINE | ID: mdl-34042158

RESUMO

Galactose oxidases (GalOxs) are well-known enzymes that have been identified in several fungal species and characterized using structural and enzymatic approaches. However, until very recently, almost no information on their biological functions was available. The Arabidopsis (Arabidopsis thaliana) gene ruby particles in mucilage (RUBY) encodes a putative plant GalOx that is required for pectin cross-linking through modification of galactose (Gal) side chains and promotes cell-cell adhesion between seed coat epidermal cells. RUBY is one member of a family of seven putative GalOxs encoded in the Arabidopsis genome. To examine the function(s) of GalOxs in plants, we studied the remaining six galactose oxidase-like (GOXL) proteins. Like RUBY, four of these proteins (GOXL1, GOXL3, GOXL5 and GOXL6) were found to localize primarily to the apoplast, while GOXL2 and GOXL4 were found primarily in the cytoplasm. Complementation and GalOx assay data suggested that GOXL1, GOXL3 and possibly GOXL6 have similar biochemical activity to RUBY, whereas GOXL5 only weakly complemented and GOXL2 and GOXL4 showed no activity. Members of this protein family separated into four distinct clades prior to the divergence of the angiosperms. There have been recent duplications in Brassicaceae resulting in two closely related pairs of genes that have either retained similarity in expression (GOXL1 and GOXL6) or show expression divergence (GOXL3 and RUBY). Mutant phenotypes were not detected when these genes were disrupted, but their expression patterns suggest that these proteins may function in tissues that require mechanical reinforcements in the absence of lignification.


Assuntos
Proteínas de Arabidopsis/genética , Arabidopsis/genética , Galactose Oxidase/genética , Expressão Gênica , Sequência de Aminoácidos , Arabidopsis/enzimologia , Proteínas de Arabidopsis/química , Proteínas de Arabidopsis/metabolismo , Galactose Oxidase/metabolismo , Filogenia , Alinhamento de Sequência
7.
Sex Transm Infect ; 97(3): 177-182, 2021 05.
Artigo em Inglês | MEDLINE | ID: mdl-33188138

RESUMO

OBJECTIVE: A multicentre, randomised non-inferiority trial compared the efficacy and safety of 14 days of ofloxacin and metronidazole (standard-of-care (SoC)) versus a single dose of intramuscular ceftriaxone followed by 5 days of azithromycin and metronidazole (intervention arm (IA)) in women with mild-to-moderate pelvic inflammatory disease (PID). METHODS: Women with a clinical diagnosis of PID presenting at sexual health services were randomised to the SoC or IA arms. Treating clinicians and participants were not blinded to treatment allocation but the clinician performing the assessment of primary outcome was blinded. The primary outcome was clinical cure defined as ≥70% reduction in the modified McCormack pain score at day 14-21 after starting treatment. Secondary outcomes included adherence, tolerability and microbiological cure. RESULTS: Of the randomised population 72/153 (47.1%) reached the primary end point in the SoC arm, compared with 68/160 (42.5%) in the IA (difference in cure 4.6% (95% CI -15.6% to 6.5%). Following exclusion of 86 women who were lost to follow-up, attended outside the day 14-21 follow-up period, or withdrew consent, 72/107 (67.3%) had clinical cure in the SoC arm compared with 68/120 (56.7%) in the IA, giving a difference in cure rate of 10.6% (95% CI -23.2% to 1.9%). We were unable to demonstrate non-inferiority of the IA compared with SoC arm. Women in the IA took more treatment doses compared with the SoC group (113/124 (91%) vs 75/117 (64%), p=0.0001), but were more likely to experience diarrhoea (61% vs 24%, p<0.0001). Of 288 samples available for analysis, Mycoplasma genitalium was identified in 10% (28/288), 58% (11/19) of which had baseline antimicrobial resistance-associated mutations. CONCLUSION: A short-course azithromycin-based regimen is likely to be less effective than the standard treatment with ofloxacin plus metronidazole. The high rate of baseline antimicrobial resistance supports resistance testing in those with M. genitalium infection to guide appropriate therapy. TRIAL REGISTRATION NUMBER: 2010-023254-36.


Assuntos
Antibacterianos/administração & dosagem , Azitromicina/administração & dosagem , Metronidazol/administração & dosagem , Ofloxacino/administração & dosagem , Doença Inflamatória Pélvica/tratamento farmacológico , Adolescente , Adulto , Quimioterapia Combinada , Feminino , Humanos , Pessoa de Meia-Idade , Mycoplasma genitalium/efeitos dos fármacos , Mycoplasma genitalium/fisiologia , Doença Inflamatória Pélvica/microbiologia , Resultado do Tratamento , Adulto Jovem
8.
Plant Physiol ; 181(3): 901-915, 2019 11.
Artigo em Inglês | MEDLINE | ID: mdl-31484679

RESUMO

Secretory trafficking is highly conserved in all eukaryotic cells and is required for secretion of proteins as well as extracellular matrix components. In plants, the export of cuticular waxes and various cell wall components relies on secretory trafficking, but the molecular mechanisms underlying their secretion are not well understood. In this study, we characterize the Arabidopsis (Arabidopsis thaliana) dwarf eceriferum11 (cer11) mutant and we show that it exhibits reduced stem cuticular wax deposition, aberrant seed coat mucilage extrusion, and delayed secondary cell wall columella formation, as well as a block in secretory GFP trafficking. Cloning of the CER11 gene revealed that it encodes a C-TERMINAL DOMAIN PHOSPHATASE-LIKE2 (CPL2) protein. Thus, secretory trafficking in plant cells in general, and secretion of extracellular matrix constituents in developing epidermal cells in particular, involves a dephosphorylation step catalyzed by CER11/CPL2.


Assuntos
Proteínas de Arabidopsis/metabolismo , Arabidopsis/metabolismo , Ubiquitina-Proteína Ligases/metabolismo , Arabidopsis/genética , Proteínas de Arabidopsis/genética , Núcleo Celular/genética , Núcleo Celular/metabolismo , Regulação da Expressão Gênica de Plantas/genética , Regulação da Expressão Gênica de Plantas/fisiologia , Fenótipo , Epiderme Vegetal/metabolismo , Plantas Geneticamente Modificadas/genética , Plantas Geneticamente Modificadas/metabolismo , Transporte Proteico/genética , Transporte Proteico/fisiologia , Sementes/metabolismo , Ubiquitina-Proteína Ligases/genética , beta-Galactosidase/metabolismo
9.
Plant Mol Biol ; 101(4-5): 373-387, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31422517

RESUMO

KEY MESSAGE: Polysaccharide composition of seed mucilage was successfully modified using three seed coat-specific promoters driving expression of genes encoding cell wall-modifying enzymes. Arabidopsis thaliana seed coat epidermal cells synthesize and secrete large quantities of mucilage, a specialized secondary cell wall composed of cellulose, hemicellulose, and pectin. The composition and structure of mucilage confers its unique properties of expansion, extrusion, and adherence. We are developing seed mucilage as a model to study the biochemical and biological consequences of manipulating cell wall polysaccharides in vivo using cell wall-modifying enzymes. To specifically engineer mucilage composition and avoid altering other cell types, seed coat-specific promoters are required. In this study, we investigated the ability of seed coat-specific promoters from three genes, TESTA-ABUNDANT2 (TBA2), PEROXIDASE36 (PER36), and MUCILAGE-MODIFIED4 (MUM4), to express the cell wall modifying ß-galactosidase (BGAL)-encoding gene MUCILAGE-MODIFIED2 (MUM2) and complement the mum2 mutant. The strength of the three promoters relative to one another was found to vary by two to 250 fold, and correlated with their ability to rescue the mum2 mutant phenotype. The strongest of the three promoters, TBA2p, was then used to examine the ability of three MUM2 homologs to complement the mum2 extrusion and cell wall composition phenotypes. The degree of complementation was variable and correlated with the amino acid sequence similarity between the homologous gene products and MUM2. These data demonstrate that all three seed coat-specific promoters can drive expression of genes encoding carbohydrate-active enzymes in a spatial and temporal pattern sufficiently to modify polysaccharide composition in seed mucilage without obvious negative consequences to the rest of the plant.


Assuntos
Arabidopsis/genética , Parede Celular/metabolismo , Mucilagem Vegetal/metabolismo , Sequência de Aminoácidos , Arabidopsis/metabolismo , Parede Celular/química , Regulação da Expressão Gênica de Plantas , Filogenia , Mucilagem Vegetal/genética , Regiões Promotoras Genéticas , Domínios Proteicos , Sementes/genética , Sementes/metabolismo , Alinhamento de Sequência , Análise de Sequência de Proteína
11.
Sex Transm Infect ; 95(8): 557-561, 2019 12.
Artigo em Inglês | MEDLINE | ID: mdl-31101723

RESUMO

OBJECTIVE: Technology-based approaches to distribute HIV self-tests (HIVST) have the potential to increase access to HIV testing in key populations. We evaluate the acceptability and feasibility of using vending machines (VMs) in a community setting to distribute HIVST to men who have sex with men at high-risk of HIV. METHODS: First, a predevelopment survey of targeted potential users explored attitudes towards HIVST and the use of a VM to deliver HIVST. Second, participatory design workshops between designers and community volunteers informed the production of a bespoke VMs dispensing free BioSureHIVST. Uptake of HIVST and user experiences were evaluated using information supplied directly from the machines interface (number of tests dispensed, user demographics), an online questionnaire and semistructured interviews. RESULTS: The predevelopment survey found that 32% of 232 sauna users had never tested for HIV, despite high-risk behaviours. A total of 265 testing kits were dispensed: mean age 31 range (18-70); 4%(n = 7) had never tested for HIV before and 11% (n = 22) had tested within the last 1-5 years. Uptake of tests was significantly higher via the VMs compared with outreach testing by community workers in the same venue during a comparable period (34 vs 6 tests per month). Qualitative interviews and online questionnaires demonstrated high acceptability for this intervention, which was considered accessible and appropriately targeted. CONCLUSIONS: VMs to distribute HIVST was feasible and acceptable. This intervention could be used in different settings to improve access to HIV testing for key populations.


Assuntos
Testes Diagnósticos de Rotina/métodos , Infecções por HIV/diagnóstico , Acessibilidade aos Serviços de Saúde/estatística & dados numéricos , Homossexualidade Masculina , Aceitação pelo Paciente de Cuidados de Saúde/estatística & dados numéricos , Autoexame/métodos , Adolescente , Adulto , Idoso , Estudos Transversais , Humanos , Masculino , Pessoa de Meia-Idade , Adulto Jovem
13.
Sex Transm Infect ; 94(2): 138-143, 2018 03.
Artigo em Inglês | MEDLINE | ID: mdl-29021406

RESUMO

OBJECTIVES: Prevention and control of gonorrhoea depends on understanding the nature of sexual networks and risk factors for infection. We aimed to use high-resolution typing (whole genome sequencing (WGS)) of Neisseria gonorrhoeae isolates plus patient questionnaire data to gain insights into transmission patterns in a high prevalence setting. METHODS: During a 9-month period (July 2014-March 2015), patients diagnosed with gonorrhoea attending sexual health service in Brighton, UK, were invited to provide anonymised detailed information by questionnaire about risk factors for infection. Questionnaire data plus WGS data from cultured isolates were analysed to yield information about sexual networks and risk factors for infection. RESULTS: 104/149 individuals who consented to participate in the study were culture positive. 97/104 (93%) were male. 80 self-reported to be men who have sex with men (MSM). 35/104 (34%) of patients were HIV positive. 51/104 (49%) individuals reported using geosocial networking applications to facilitate contact. Sex under the influence of drugs was reported by 16/34 (46%) of HIV-positive MSM, 17/41 (41%) of HIV-negative MSM and 5/15 (31%) of heterosexuals. WGS data were available for 100 isolates from 83 patients. 55 isolates (66%) belonged to genetically related subtypes involving one or more patients, who could be plausibly linked through recent direct or indirect transmission. Four transmission clusters containing 3-12 individuals were composed of MSM of mixed HIV serostatus. CONCLUSIONS: We show that data obtained from WGS of N. gonorrhoeae and enhanced epidemiological data obtained from patient questionnaires are mutually supportive and reveal insights into sexual networks. Our findings suggest that serosorting may have declined as a practice and indicate the importance of designing public health interventions that target infection risks associated with recreational drug use and contact made using geosocial networking applications.


Assuntos
Gonorreia/transmissão , Infecções por HIV/epidemiologia , Neisseria gonorrhoeae/genética , Sequenciamento Completo do Genoma , Adulto , Infecções por Chlamydia/epidemiologia , Análise por Conglomerados , Feminino , Gonorreia/epidemiologia , Gonorreia/microbiologia , Infecções por HIV/imunologia , Infecções por HIV/virologia , Soroprevalência de HIV , Heterossexualidade/estatística & dados numéricos , Homossexualidade Masculina , Humanos , Masculino , Pessoa de Meia-Idade , Prevalência , Fatores de Risco , Comportamento Sexual , Parceiros Sexuais , Inquéritos e Questionários , Adulto Jovem
14.
Plant Mol Biol ; 95(1-2): 33-50, 2017 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-28730525

RESUMO

KEY MESSAGE: The Arabidopsis seed coat-specific promoter fragment described is an important tool for basic and applied research in Brassicaceae species. During differentiation, the epidermal cells of the Arabidopsis seed coat produce and secrete large quantities of mucilage. On hydration of mature seeds, this mucilage becomes easily accessible as it is extruded to form a tightly attached halo at the seed surface. Mucilage is composed mainly of pectin, and also contains the key cell wall components cellulose, hemicellulose, and proteins, making it a valuable model for studying numerous aspects of cell wall biology. Seed coat-specific promoters are an important tool that can be used to assess the effects of expressing biosynthetic enzymes and diverse cell wall-modifying proteins on mucilage structure and function. Additionally, they can be used for production of easily accessible recombinant proteins of commercial interest. The MUCILAGE-MODIFIED4 (MUM4) gene is expressed in a wide variety of plant tissues and is strongly up-regulated in the seed coat during mucilage synthesis, implying the presence of a seed coat-specific region in its promoter. Promoter deletion analysis facilitated isolation of a 308 base pair sequence (MUM4 0.3Pro ) that directs reporter gene expression in the seed coat cells of both Arabidopsis and Camelina sativa, and is regulated by the same transcription factor cascade as endogenous MUM4. Therefore, MUM4 0.3Pro is a promoter fragment that serves as a new tool for seed coat biology research.


Assuntos
Proteínas de Arabidopsis/genética , Arabidopsis/genética , Regulação da Expressão Gênica de Plantas , Complexos Multienzimáticos/genética , Regiões Promotoras Genéticas , Sementes/genética , Regiões 5' não Traduzidas/genética , Proteínas de Arabidopsis/metabolismo , Simulação por Computador , Inativação Gênica , Genes Reporter , Teste de Complementação Genética , Glucuronidase/metabolismo , Íntrons/genética , Complexos Multienzimáticos/metabolismo , Fases de Leitura Aberta/genética , Reação em Cadeia da Polimerase em Tempo Real , Deleção de Sequência , Fatores de Transcrição/metabolismo
15.
Sex Transm Infect ; 93(8): 556-557, 2017 12.
Artigo em Inglês | MEDLINE | ID: mdl-28438948

RESUMO

There is growing concern worldwide for macrolide resistance in M. genitalium following liberal use of 1 g azithromycin to treat non-gonococcal urethritis and confirmed C. trachomatis infection. Moxifloxacin is the second-line treatment for M. genitalium and still has excellent efficacy against it. However, recent reports indicating that quinolone resistance is more prevalent than previously thought are worrying. Routine testing of symptomatic men and women for M. genitalium is not currently recommended in BASHH guidelines, and attempts to implement such testing have been hampered by a lack of commercially available assays. We present a case of M. genitalium urethritis which failed to respond to four different antibiotic regimens, resulting in multiple visits to the clinic and anxiety for the patient.


Assuntos
Antibacterianos/uso terapêutico , Doxiciclina/uso terapêutico , Farmacorresistência Bacteriana/genética , Mutação/efeitos dos fármacos , Infecções por Mycoplasma/tratamento farmacológico , Mycoplasma genitalium/efeitos dos fármacos , RNA Ribossômico 23S/efeitos dos fármacos , Adulto , Busca de Comunicante , Farmacorresistência Bacteriana/efeitos dos fármacos , Humanos , Masculino , Mutação/genética , Infecções por Mycoplasma/genética , Mycoplasma genitalium/imunologia , Quinolonas/imunologia , Quinolonas/uso terapêutico , RNA Ribossômico 23S/genética , Análise de Sequência de DNA , Falha de Tratamento , Sexo sem Proteção , Uretrite
16.
Sex Transm Infect ; 93(6): 445-451, 2017 09.
Artigo em Inglês | MEDLINE | ID: mdl-28137933

RESUMO

OBJECTIVE: Invasive meningococcal disease (IMD) outbreaks in men who have sex with men (MSM) have been associated with meningococcal colonisation of the urethra and rectum, but little is known about this colonisation or co-colonisation with the closely related gonococcus. Whole genome sequencing (WGS) was employed to explore these phenomena. METHODS: Meningococci isolated from the urogenital tract and rectum (n=23) and coincident gonococci (n=14) were analysed by WGS along with contemporary meningococci from IMD (n=11). All isolates were obtained from hospital admissions in Brighton, UK, 2011-2013. Assembled WGS were deposited in the PubMLST/neisseria database (http://pubmlst.org/neisseria) and compared at genomic loci common to gonococci or meningococci. RESULTS: As expected, most meningococci from IMD were encapsulated and belonged to hyperinvasive lineages. So too were meningococci found in the urogenital tract and rectum, contrasting to those asymptomatically carried in the nasopharynx where such meningococci are rare. Five hyperinvasive meningococcal lineages and four distinct gonococcal genotypes were recovered, including multiresistant ST-1901 (NG MAST-1407) gonococci. CONCLUSIONS: These data were consistent with a predisposition for potentially virulent encapsulated hyperinvasive meningococci to colonise the urethra and rectum, which suggests their involvement in MSM IMD outbreaks. The coincidence of multiresistant gonococci raises wider public health concerns.


Assuntos
Farmacorresistência Bacteriana Múltipla/genética , Genoma Bacteriano/genética , Gonorreia/microbiologia , Neisseria meningitidis/genética , Neisseria meningitidis/isolamento & purificação , Reto/microbiologia , Sistema Urogenital/microbiologia , Surtos de Doenças , Gonorreia/diagnóstico , Humanos , Masculino
17.
Plant Physiol ; 168(2): 502-20, 2015 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-25926481

RESUMO

Cellulose synthase5 (CESA5) synthesizes cellulose necessary for seed mucilage adherence to seed coat epidermal cells of Arabidopsis (Arabidopsis thaliana). The involvement of additional CESA proteins in this process and details concerning the manner in which cellulose is deposited in the mucilage pocket are unknown. Here, we show that both CESA3 and CESA10 are highly expressed in this cell type at the time of mucilage synthesis and localize to the plasma membrane adjacent to the mucilage pocket. The isoxaben resistant1-1 and isoxaben resistant1-2 mutants affecting CESA3 show defects consistent with altered mucilage cellulose biosynthesis. CESA3 can interact with CESA5 in vitro, and green fluorescent protein-tagged CESA5, CESA3, and CESA10 proteins move in a linear, unidirectional fashion around the cytoplasmic column of the cell, parallel with the surface of the seed, in a pattern similar to that of cortical microtubules. Consistent with this movement, cytological evidence suggests that the mucilage is coiled around the columella and unwinds during mucilage extrusion to form a linear ray. Mutations in CESA5 and CESA3 affect the speed of mucilage extrusion and mucilage adherence. These findings imply that cellulose fibrils are synthesized in an ordered helical array around the columella, providing a distinct structure to the mucilage that is important for both mucilage extrusion and adherence.


Assuntos
Proteínas de Arabidopsis/metabolismo , Arabidopsis/enzimologia , Celulose/metabolismo , Glucosiltransferases/metabolismo , Complexos Multienzimáticos/metabolismo , Epiderme Vegetal/citologia , Mucilagem Vegetal/metabolismo , Sementes/citologia , Sequência de Aminoácidos , Proteínas de Arabidopsis/química , Citoplasma/metabolismo , Glucosiltransferases/química , Proteínas de Fluorescência Verde/metabolismo , Microtúbulos/metabolismo , Modelos Biológicos , Dados de Sequência Molecular , Mutação/genética , Pectinas/metabolismo , Ligação Proteica , Estrutura Terciária de Proteína , Dedos de Zinco
18.
Plant Cell ; 25(3): 944-59, 2013 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-23482858

RESUMO

Pectins are complex polysaccharides that form the gel matrix of the primary cell wall and are abundant in the middle lamella that holds plant cells together. Their degree of methylesterification (DM) impacts wall strength and cell adhesion since unesterified pectin regions can cross-link via Ca(2+) ions to form stronger gels. Here, we characterize flying saucer1 (fly1), a novel Arabidopsis thaliana seed coat mutant, which displays primary wall detachment, reduced mucilage extrusion, and increased mucilage adherence. These defects appear to result from a lower DM in mucilage and are enhanced by the addition of Ca(2+) or completely rescued using alkaline Ca(2+) chelators. FLY1 encodes a transmembrane protein with a RING-H2 domain that has in vitro E3 ubiquitin ligase activity. FLY1 is orthologous to TRANSMEMBRANE UBIQUITIN LIGASE1, a Golgi-localized E3 ligase involved in the quality control of membrane proteins in yeast. However, FLY1-yellow fluorescent protein (YFP) fusions are localized in punctae that are predominantly distinct from the Golgi and the trans-Golgi network/early endosome in the seed coat epidermis. Wortmannin treatment, which induces the fusion of late endosomes in plants, resulted in enlarged FLY1-YFP bodies. We propose that FLY1 regulates the DM of pectin in mucilage, potentially by recycling pectin methylesterase enzymes in the endomembrane system of seed coat epidermal cells.


Assuntos
Proteínas de Arabidopsis/metabolismo , Arabidopsis/enzimologia , Pectinas/metabolismo , Mucilagem Vegetal/metabolismo , Sementes/enzimologia , Ubiquitina-Proteína Ligases/metabolismo , Arabidopsis/efeitos dos fármacos , Arabidopsis/genética , Proteínas de Arabidopsis/genética , Cálcio/metabolismo , Cálcio/farmacologia , Parede Celular/genética , Parede Celular/metabolismo , Quelantes/farmacologia , Endossomos/enzimologia , Endossomos/genética , Endossomos/metabolismo , Esterificação , Regulação da Expressão Gênica de Plantas , Genes de Plantas , Complexo de Golgi/genética , Complexo de Golgi/metabolismo , Concentração de Íons de Hidrogênio , Epiderme Vegetal/genética , Epiderme Vegetal/metabolismo , Mucilagem Vegetal/genética , Sementes/efeitos dos fármacos , Sementes/genética , Ubiquitina-Proteína Ligases/genética , Água/metabolismo
20.
Women Health ; 54(3): 177-93, 2014.
Artigo em Inglês | MEDLINE | ID: mdl-24580133

RESUMO

We conducted a retrospective cohort study using randomly selected medical charts of women reporting a history of partner violence and women with no history of partner violence at the time of a family planning or abortion appointment (n = 6,564 per group). We analyzed lifetime history of partner violence for odds of lifetime history of abortion and miscarriage number, and birth control problems. To more closely match timing, we analyzed a subsample of 2,186 women reporting current violence versus not at the time of an abortion appointment for differences in gestational age, medical versus surgical method choice, and return for follow-up visit. After adjusting for years at risk and demographic characteristics, women with a past history of partner violence were not more likely to have ever had one abortion, but they were more likely to have had problems with birth control, repeat abortions, and miscarriages than women with no history of violence. Women with current partner violence were also more likely to be receiving an abortion at a later gestational age. We found no differences between the groups in return for abortion follow-up visit or choice of surgical versus medication abortion. Findings support screening for the influence of partner violence on reproductive health and related safety planning.


Assuntos
Aborto Induzido/estatística & dados numéricos , Parceiros Sexuais , Maus-Tratos Conjugais/estatística & dados numéricos , Cônjuges/estatística & dados numéricos , Adolescente , Adulto , Serviços de Planejamento Familiar , Feminino , Humanos , Recém-Nascido , Relações Interpessoais , Modelos Logísticos , Masculino , Pessoa de Meia-Idade , New York/epidemiologia , Gravidez , Gravidez não Planejada , Estudos Retrospectivos , Fatores Socioeconômicos , Inquéritos e Questionários , Adulto Jovem
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA