Lack of evidence of acute HEV infections as a sexually transmitted disease: Data from a German cohort of PrEP users.

BACKGROUND: While the sexual transmissibility of HAV in MSM has been extensively described, the potential for sexual transmission of HEV has not been definitively established. Although HEV has been detected in the ejaculate of chronically infected men, studies among MSM PrEP users in France did not observe an elevated anti-HEV seroprevalence as an indicator of increased exposure risk by sexual intercourse. PATIENTS AND METHODS: A total of 111 unselected PrEP users and 111 age- and sex-matched blood donors were tested for anti-HEV IgG, IgM and HEV (PCR). Of the participants 79/111 (71 %) responded to a questionnaire covering topics as sexual preferences, previous sexually transmitted diseases, profession, food consumption, and pet ownership. RESULTS: The anti-HEV IgG seroprevalence in PrEP users (22 %) did not differ significantly from the rate in controls (17 %). While one PrEP user and three controls tested positive for anti-HEV IgM, all PrEP users and controls tested PCR negative. CONCLUSION: In immunocompetent individuals with frequent changes of sexual partners, the epidemiology of Hepatitis E Virus does not significantly involve the sexual transmission route.

Lack of evidence of acute HEV infections as a sexually transmitted disease: Data from a German cohort of PrEP users

Abstract Background While the sexual transmissibility of HAV in MSM has been extensively described, the potential for sexual transmission of HEV has not been definitively established. Although HEV has been detected in the ejaculate of chronically infected men, studies among MSM PrEP users in France did not observe an elevated anti-HEV seroprevalence as an indicator of increased exposure risk by sexual intercourse. Patients and methods A total of 111 unselected PrEP users and 111 age- and sex-matched blood donors were tested for anti-HEV IgG, IgM and HEV (PCR). Of the participants 79/111 (71 %) responded to a questionnaire covering topics as sexual preferences, previous sexually transmitted diseases, profession, food consumption, and pet ownership. Results The anti-HEV IgG seroprevalence in PrEP users (22 %) did not differ significantly from the rate in controls (17 %). While one PrEP user and three controls tested positive for anti-HEV IgM, all PrEP users and controls tested PCR negative. Conclusion In immunocompetent individuals with frequent changes of sexual partners, the epidemiology of Hepatitis E Virus does not significantly involve the sexual transmission route.

Conocimiento y uso de anticonceptivos en relación con la diversidad sexual, Universidad Andrés Bello, 2022 / Knowledge and use of contraceptives regarding sexual diversity, Universidad Andrés Bello, 2022

Introducción: Los métodos anticonceptivos se han utilizado desde hace ya bastante tiempo. Han ido evolucionando con el paso de los años y existen diversos tipos, que satisfacen cada necesidad de los usuarios. Objetivo: Analizar el conocimiento y uso de métodos anticonceptivos (MAC) en la diversidad sexual de los alumnos de la Universidad Andrés Bello (UNAB) entre 18 y 25 años en el año 2022. Método: Estudio con un enfoque transversal cualitativo, llevado a cabo por medio de una encuesta realizada a los estudiantes de las tres sedes de la UNAB de entre 18 y 25 años, con un tamaño de muestra de 140 estudiantes. Resultados: Según las características sociodemográficas; la «edad» mantuvo un grupo control de 70 personas en ambas categorías; en «sede» el 87% de los encuestados pertenecía a la sede de Santiago; en «identidad de género» la mujer cisgénero con un 79% y en «orientación sexual» fueron las personas heterosexuales con un 47%. Conclusión: Existe una relación estadística entre las variables «uso de MAC» y «orientación sexual». También las variables de «orientación sexual» y «tipo de MAC», y «orientación sexual» con «frecuencia en el uso de preservativo interno y externo».

Background: Contraceptive methods have been used since a lot of time, which have been evolved over the years, having a lot of types satisfying every necessities of the users. Aim: Analyze the knowledge and use of contraceptive methods in the sexual diversity of Universidad Andrés Bello (UNAB) students between 18 and 25 years old in the year 2022. Method: Study with a cross sectional qualitative approach, carried out through a survey of students from the three campuses of UNAB between 18 to 25 years old with a sample size of 140 students. Results: According to sociodemographic characteristics; “Age” was maintained in the control group with 70 people in both categories; in “Campus” 87% of the surveyed belonged to the Santiago campus; in “Gender identity” the cisgender woman with 79% and “Sexual orientation” were straight people with 47%. Conclusion: There is a statistical relationship between the variables “Use of contraceptive methods” and “Sexual orientation”. Also, the variables of “Sexual orientation” and “Type of contraceptive methods”, and “Sexual orientation” with “Frequency in use of internal and external preservative”.

Prevalencia de infección por Chlamydia trachomatis y relación con el perfil de conductas sexuales en adolescentes y mujeres jóvenes de la Provincia de Osorno, Chile / Prevalence of Chlamydia trachomatis infection and relationship with the profile of sexual behaviors in adolescents and young women in the Province of Osorno, Chile

INTRODUCCIÓN: La infección por Chlamydia trachomatis es la ITS bacteriana más frecuente del mundo. En el cervix se presenta mayormente de forma asintomática y afecta especialmente a mujeres jóvenes y adolescentes. Puede producir daño permanente en el tracto reproductor femenino, se asocia a parto prematuro, infecciones neonatales transmitidas vía vertical y mayor riesgo de adquirir otras ITS como VIH Y VPH. Por estos motivos se han establecido estrategias de tamizaje para detectar y tratar precozmente la infección asintomática por C. trachomatis en diferentes países. En nuestro país no contamos con un programa nacional de tamizaje. OBJETIVO: Determinar la prevalencia de infección asintomática por Chlamydia trachomatis en mujeres entre 12 y 21 años de la Provincia de Osorno, Región de Los Lagos, Chile. PACIENTES Y MÉTODOS: Se desarrolló un estudio de diseño transversal con una cohorte única de mujeres adolescentes y jóvenes consultantes en el Policlínico de Alto Riesgo Obstétrico y de Ginecología Infantil y Adolescente, del Hospital Base de Osorno, entre enero de 2019 y enero 2020. Se determinó el estado de infección asintomática mediante RPC en tiempo real para C. trachomatis. Se realizó una encuesta a fin de determinar características demográficas, hábitos y conductas sexuales de las pacientes estudiadas. RESULTADOS: Fueron reclutadas 124 mujeres entre 12 a 21 años de edad, de las cuales, 36 (29,3%) se encontraban embarazadas al momento del estudio. La prevalencia de infección asintomática por C. trachomatis fue de 14/124 (11,3%). En las mujeres gestantes se encontraron 6/36 (16,7%) casos positivos de infección por C. trachomatis y 8/88 (9,1%) en las no gestantes. Existe una mayor frecuencia de infección asintomática a menor edad de inicio de actividad sexual (33,3% en aquellas que inician entre 11-12 años vs. 16,2% en las que inician entre 1314 años, 7,4% entre 15-16 y 8% entre 17-21 años; p < 0,05). Esta tendencia no fue observada al comparar el estado de infección con el tiempo de vida sexual activa. Sólo 15,7% de las pacientes utilizó preservativo en todas sus relaciones sexuales. DISCUSIÓN: La infección asintomática por C. trachomatis es frecuente en las mujeres adolescentes y jóvenes sexualmente activas. Las pacientes con inicio más temprano de la actividad sexual coital (bajo 13 años de edad) podrían estar en mayor riesgo. Se requiere con urgencia establecer la frecuencia nacional de infección para desarrollar una estrategia sanitaria para su pesquisa y manejo oportuno en nuestro país.

BACKGROUND: Chlamydia trachomatis infection is the world most common bacterial STI. At uterine cervix it presents mostly asymptomatically and especially affects young women and adolescents. It can cause permanent damage to the female reproductive tract and is associated with premature birth, connatal infections and increased risk of acquiring other STIs such as HIV and HPV. For these reasons, other countries have established screening strategies to detect and treat asymptomatic C. trachomatis infection. Our country don't have a national screening program. AIM: To determine the prevalence of C. trachomatis asymptomatic infection in adolescent and young women in Osorno province, Los Lagos Region, Chile. METHODS: A crosssectional study was performed in adolescent and young women who consult at Hospital Base Osorno in the MaternoFetal and PediatricAdolescent Gynecology ambulatory clinics, between January 2019 and January 2020. The status of asymptomatic infection was determined by PCR for C. trachomatis. A survey was carried out to determine the demographic characteristics, habits and sexual behaviors. RESULTS: 124 women between 12 and 21 years of age were recruited, of which 36 (29,3%) were pregnant at the time of the study. The prevalence of asymptomatic infection by C. trachomatis was 11.3.%. In pregnant women, there were 6/36 (16.7%) positive cases for C. trachomatis and 8/88 (9.1%) in nonpregnant women. We found a higher frequency of asymptomatic infection at younger age of first sexual intercourse (33% in adolescents at 11-12 years old vs. 16.2% at 13-14, 7.4% at 15-16 and 8% at 17-21; p<0.05). Only 15.7% of the patients utilized condoms in all their intercourses. DISCUSSION: Asymptomatic C. trachomatis infection is common in adolescent and young women, with a higher risk in those who onset sexual activity at an early age (less than 13 years old). It is urgently required to determine the national frequency of asymptomatic C. trachomatis infection to develop a national strategy for screening and timely treatment.

Description of a specialized outpatient clinic as a reference center for children and adolescents living with HIV/AIDS in southern Brazil / Descrição de um ambulatório especializado referência em crianças e adolescentes vivendo com HIV/AIDS no sul do Brasil

Introduction: Children living with HIV/AIDS require specialized care. Objective: To describe clinical and epidemiological characteristics of patients living with HIV/AIDS. Methods: Observational, descriptive study using medical records data of patients with HIV/AIDS under 14 years of age. Approved by the institution's Ethics Committee under number 1,432,517. Results: 60 cases were included; the median follow-up duration was 6.8 years; 50.0% were male; 88.3% were white; 75.0% were from the capital and metropolitan region. Prenatal records were available for 51 cases, but only 44.6% received antiretroviral therapy (ART) during pregnancy (mean duration of 3.3 months). HIV diagnosis was based on clinical symptoms in 28.3% of the cases, occurring in similar proportions for both childhood common infections and opportunistic infections. According to the CDC clinical classification (1994), at the start of follow-up, 56.6% of patients had moderate or severe symptoms, which would be reduced to only 18.3% upon reclassification at the last visit (p=0.016). Initially, 41.7% showed evidence of immunosuppression, compared to 19.9% at the time of the study (p=0.5). Only 6.6% remained asymptomatic. A decrease in the average number of hospitalizations was observed during follow-up. Conclusion: Among the cases diagnosed based on clinical symptoms, half were attributed to common childhood infections and lacked immunosuppression

Introdução: Crianças que vivem com o vírus da imunodeficiência humana ­ HIV/AIDS requerem atendimento especializado. Objetivo: Descrever características clínicas e epidemiológicas de pacientes que vivem com HIV/AIDS. Métodos: Estudo observacional, descritivo, com dados de prontuários de pacientes com HIV/AIDS de até 14 anos de idade incompletos, aprovado pelo Comitê de Ética em Pesquisa da instituição sob o número 1.432.517. Resultados: Foram incluídos 60 casos. A mediana de acompanhamento foi de 6,8 anos; 50,0% eram do sexo masculino; 88,3% brancos; 75,0% naturais da capital e região metropolitana. Em 51 prontuários havia descrição de pré-natal, porém apenas 44,6% fizeram uso de terapia antirretroviral (TARV) na gestação (tempo médio de 3,3 meses). Em 28,3% o HIV foi pesquisado por sintomas clínicos, que ocorreram em proporções similares tanto por infecções habituais da infância como por oportunistas. De acordo com a classificação clínica dos Centers for Disease Control and Prevention ­ CDC (1994), ao início do acompanhamento, 56,6% dos pacientes apresentavam sintomas moderados ou graves e, na última consulta, se fossem reclassificados, seriam apenas 18,3% (p=0,016). Incialmente, 41,7% apresentavam evidência de imunossupressão, comparativamente aos 19,9% na ocasião do estudo (p=0,5). Apenas 6,6% permaneceram assintomáticos. Com o acompanhamento, verificou-se diminuição na média do número de hospitalizações. Conclusão: Dos casos que apresentaram seu diagnóstico por sintomas clínicos, metade foi por infecções habituais da infância e sem imunossupressão

Role of Corneal Epithelial Measurements in Differentiating Eyes with Stable Keratoconus from Eyes that Are Progressing.

Purpose: To evaluate measures of corneal epithelium in eyes that showed documented signs of keratoconus (KC) progression and compare with stable eyes and healthy controls. Also, to determine the correlation of these epithelial parameters with maximum keratometry (K max) and pachymetry. Design: Prospective, observational, comparative study. Participants: One-hundred and fifty eyes from 150 patients. The study included 50 eyes from patients with documented KC progression, 50 eyes with stable KC, and 50 clinically normal eyes to serve as controls. Methods: A spectral-domain (SD)-OCT imaging was obtained in all eyes, and mean values were compared between the groups. The correlation of epithelial parameters with K max and thinnest pachymetry was also investigated. Main Outcome Measures: For the purposes of this study, the epithelial measures maximum, minimum, superior, and inferior values as well as the difference between the minimum and maximum (min-max) and epithelial standard deviation were considered, obtained from SD-OCT and compared between groups. Measurements of the thinnest point and min-max in pachymetry were also recorded. Results: The only epithelial parameter that presented a statistically significant difference between stable and progressive KC was epithelium min-max. Although stable KC presented epithelium min-max mean values of -18.2 ± 6.6, progressive KC eyes presented mean values of -23.4 ± 10.3 (P < 0.0001). Epithelial maximum (P = 0.16), minimum (P = 0.25), superior (P = 0.28), inferior (P = 0.23), and standard deviation (P = 0.25) values were not significantly different between stable and progressive eyes. Difference min-max pachymetry points in stable (-108.3 ± 33.5) and progressive KC (-115.2 ± 56.0) were not significantly different (P = 0.723). There was no significant correlation between epithelium min-max with corneal thinning (P = 0.39) or K max (P = 0.09) regardless of disease progression. Conclusions: Epithelial measures are useful to identify KC eyes that are progressing; the parameters that measure the difference between min-max epithelium points were significantly different between stable and progressive groups, unlike this difference in pachymetry. Finally, this epithelial parameter seems to be independent of corneal thinning and K max. Financial Disclosures: Proprietary or commercial disclosure may be found after the references.

Distribución de virus de papiloma humano de alto riesgo oncogénico y otras infecciones de transmisión sexual en mujeres paraguayas con y sin virus de la inmunodeficiencia humana

El virus de papiloma humano de alto riesgo oncogénico (VPH-AR) es causa necesaria pero no suficiente para la ocurrencia de cáncer de cuello uterino (CCU). Mujeres portadoras del virus de inmunodeficiencia humana (VIH) presentan mayor riesgo de desarrollar lesiones precursoras del cáncer de cuello de útero, por ello, el objetivo del presente trabajo prospectivo de corte transversal fue determinar la frecuencia de VPH-AR y otras infecciones de transmisión sexual-ITS (condilomas, sífilis, virus del herpes simple, gonorrea, citomegalovirus, hepatitis B) en 218 mujeres con y sin VIH que acudieron al Programa Nacional de Lucha contra el SIDA (PRONASIDA) desde julio 2017 hasta marzo 2021. Se encontró que 16/54 (29,6%) mujeres VIH-positivas presentaron infección por VPH-AR en comparación a 41/164 (25%) mujeres VIH-negativas (p>0,05). En relación a la edad, mujeres VIH positivas presentaron una frecuencia comparable de infección por VPH-AR (30 años 30,2%), a diferencia de mujeres VIH negativas donde hubo una disminución significativa de la infección por VPH-AR luego de los 30 años (30 años 18,8%, p= 0,028). Esto podría explicarse por la inmunosupresión observada en mujeres VIH positivas que podría favorecer infecciones persistentes, sugiriendo que deben ser controladas más cercanamente. Además, se observó mayor frecuencia de otras ITS en mujeres VIH positivas (29,6% vs 15,8%, p=0,026), lo cual sugiere que aparte del monitoreo más cercano, es fundamental fortalecer la educación sobre factores de riesgo para la ITS sobre todo VPH y VIH, así como la realización de prevención primaria por vacunación contra el VPH.

High-risk human papillomavirus (HPV-HR) is a necessary but not sufficient cause for cervical cancer (CC). Women carriers of human immunodeficiency virus (HIV) present an increased risk for the development of cervical cancer precursor lesions, therefore, the objective of the present prospective cross-sectional study was to determine the frequency of HPV-HR and other sexually transmitted infections-STIs (condylomas, syphilis, herpes simplex virus, gonorrhoea, cytomegalovirus, hepatitis B) in 218 women with and without HIV who attended the Ministry of Health from July 2017 to March 2021. It was found that 16/54 (29.6%) HIV-positive women had HPV infection compared to 41/164 (25%) HIV-negative women (p>0.05). In relation to age, HIV-positive women had a comparable frequency of HPV infection (30 years 30.2%), unlike HIV-negative women whom above 30 years of age presented a significant decrease in HPV-AR infection (30 years 18.8%, p:0.028). This could be explained by the immunosuppression observed in HIV-positive women which could favour persistent infections, suggesting that they should be controlled more closely. In addition, other STIs were observed to be more frequent in HIV-positive women (29.6% vs 15.8%, p:0.026), which suggests that apart from closer monitoring, it is essential to strengthen education on risk factors for STIs, especially HPV and HIV, as well as the implementation of primary prevention by vaccination against HPV.

Inclusion Complex between Local Anesthetic/2-hydroxypropyl-ß-cyclodextrin in Stealth Liposome.

The drugs delivery system in the treatment of diseases has advantages such as reduced toxicity, increased availability of the drug, etc. Therefore, studies of the supramolecular interactions between local anesthetics (LAs) butamben (BTB) or ropivacaine (RVC) complexed with 2-hydroxypropyl-ß-cyclodextrin (HP-ßCD) and carried in Stealth liposomal (SL) are performed. 1H-NMR nuclear magnetic resonance (DOSY and STD) were used as the main tools. The displacements observed in the 1H-NMR presented the complexion between LAs and HP-ßCD. The diffusion coefficients of free BTB and RVC were 7.70 × 10-10 m2 s-1 and 4.07 × 10-10 m2 s-1, and in the complex with HP-ßCD were 1.90 × 10-10 m2 s-1 and 3.64 × 10-10 m2 s-1, respectively, which indicate a strong interaction between the BTB molecule and HP-ßCD (98.3% molar fraction and Ka = 72.279 L/mol). With STD-NMR, the encapsulation of the BTB/HP-ßCD and RVC/HP-ßCD in SL vesicles was proven. Beyond the saturation transfer to the LAs, there is the magnetization transfer to the hydrogens of HP-ßCD. BTB and RVC have already been studied in normal liposome systems; however, little is known of their behavior in SL.

Hesperetin targets the hydrophobic pocket of the nucleoprotein/phosphoprotein binding site of human respiratory syncytial virus.

The human Respiratory Syncytial Virus (hRSV) is one of the most common causes of acute respiratory diseases such as bronchiolitis and pneumonia in children worldwide. Among the viral proteins, the nucleoprotein (N) stands out for forming the nucleocapsid (NC) that functions as a template for replication and transcription by the viral polymerase complex. The NC/polymerase recognition is mediated by the phosphoprotein (P), which establishes an interaction of its C-terminal residues with a hydrophobic pocket in the N-terminal domain of N (N-NTD). The present study consists of biophysical characterization of N-NTD and investigation of flavonoids binding to this domain using experimental and computational approaches. Saturation transfer difference (STD)-NMR measurements showed that among the investigated flavonoids, only hesperetin (Hst) bound to N-NTD. The binding epitope mapping of Hst suggested that its fused aromatic ring is buried in the protein binding site. STD-NMR and fluorescence anisotropy experiments showed that Hst competes with P protein C-terminal dipeptides for the hRSV nucleoprotein/phosphoprotein (N/P) interaction site in N-NTD, indicating that Hst binds to the hydrophobic pocket in this domain. Computational simulations of molecular docking and dynamics corroborated with experimental results, presenting that Hst established a stable interaction with the N/P binding site. The outcomes presented herein shed light on literature reports that described a significant antireplicative activity of Hst against hRSV, revealing molecular details that can provide the development of a new strategy against this virus.

Conhecimentos, percepções e itinerários terapêuticos de travestis e mulheres trans no cuidado a infecções sexualmente transmissíveis em Salvador, Brasil / Knowledge, perceptions and therapeutic itineraries of travestis and transgender woman in the care of sexually transmitted infections in Salvador, Brazil / Conocimientos, percepciones e rutas terapéuticas de travestis y mujeres trans en la atención de enfermedades de transmisión sexual en Salvador, Brasil

Resumo O artigo objetivou analisar conhecimentos, percepções, práticas de cuidado e Itinerrários Terapêuticos (IT) para o diagnóstico e tratamento das Infecções Sexualmente Transmissíveis (IST), com destaque para sífilis, entre Travestis e Mulheres Trans (TrMT) em Salvador, Brasil. Foram realizados 05 grupos focais e 06 entrevistas semiestruturadas com 30 TrMT. Os achados apontam amplo desconhecimento e percepções contraditórias sobre as IST, especialmente a sífilis; identificação de duas importantes trajetórias de cuidado às IST e o destaque para IT marcados por estigmas e discriminação nos serviços de saúde. Sugere-se a ampliação das ações de saúde para essa população reconhecendo suas necessidades e a construção de novas estratégias de prevenção e tratamento para IST, dialogadas com as TrMT, e garantia de autonomia, ética e sigilo na produção do cuidado.

Abstract The article aimed to analyze knowledge, perceptions, care practices and Therapeutic Itineraries (TI) for the diagnosis and treatment of Sexually Transmitted Diseases (STD), with emphasis on syphilis, among travesti and transgender women (TGW) in Salvador, Brazil. 05 focus groups and 06 semi-structured interviews with travesti/TGW were carried out with a total of 30 participants. The findings point to a wide lack of knowledge and contradictory perceptions about STD, especially syphilis; identification of two important trajectories of care for STD and the emphasis on TI marked by stigma and discrimination in health services. The expansion of health actions for this population is suggested, recognizing their needs and the construction of new prevention and treatment strategies for STD, in dialogue with the travesti/TGW, and guaranteeing autonomy, ethics and confidentiality in the production of care.

Resumen El artículo tuvo como objetivo analizar conocimientos, percepciones, prácticas de atención y Rutas Terapêuticas (RT) para el diagnóstico y tratamiento de las Enfermedades de Transmisión Sexual (ETS), con énfasis en la sífilis, entre las travestidas y mujeres trans (TrMT) en Salvador, Brasil. Se realizaron 05 grupos focales y 06 entrevistas semiestructuradas con 30 TrMT. Los hallazgos apuntan a una amplia falta de conocimiento y percepciones contradictorias sobre las ETS, especialmente la sífilis; identificación de dos importantes trayectorias de atención a las ETS y el énfasis en las RT marcadas por el estigma y la discriminación en los servicios de salud. Se sugiere ampliar las acciones de salud para esta población, reconociendo sus necesidades y la construcción de nuevas estrategias de prevención y tratamiento de las ETS, en diálogo con el TrMT, y garantizando la autonomía, ética y confidencialidad en la producción de cuidados.

Probing the acetylcholinesterase inhibitory activity of a novel Ru(II) polypyridyl complex and the supramolecular interaction by (STD)-NMR.

Currently, acetylcholinesterase (AChE) inhibitors are the only anti-Alzheimer drugs commercially available. Despite their wide use those drugs are all dose dependent and their effect last for no longer than two years, with several side effects. The search of novel acetylcholinesterase (AChE) inhibitors remains as the main scientific route. Here we describe the synthesis, characterization, biological activity and an NMR binding-target study of a novel cis-[Ru(Bpy)2(EtPy)2]2+, (RuEtPy), Bpy = 2,2'-bipyridine and EtPy = 4,2-Ethylamino-pyridine) as a potential AChE inhibitor. The classic Ellman's colorimetric assay suggests that the RuEtPy exhibits a high inhibitory activity, following a competitive mechanism, with a remarkable low inhibition constant (Ki ≈ 16.8 µM), together with a IC50 = 39 µM. Hence, we have studied the spatial interactions for this novel candidate towards the human acetylcholinesterase (hAChE) using saturation transfer difference (STD)-NMR, in order to describe the mechanism of the interaction. NMR binding-target results shows that the 4,2-Ethylamino-Pyridine group is spatially closer to hAChE surface chemical arrangement than 2,2' bipyridine counterpart, exerting an efficient intermolecular interaction, with a low dissociation constant (KD ≈ 55 µM), probing that 4,2-Ethylamino-pyridine motif plays a key role in the inhibitory action.

Prevalencia de la infección por Chlamydia trachomatis y su potencial impacto perinatal en pacientes chilenas / Prevalence of Chlamydia trachomatis infection and a potential perinatal impact in Chilean patients

Resumen Chlamydia trachomatis es la infección de transmisión sexual bacteriana más frecuente en el mundo. Según datos de la Organización Mundial de la Salud, su prevalencia se estima alrededor de 4,2% en mujeres. Es una infección silente; sin embargo, puede desarrollar complicaciones en la fertilidad o durante el embarazo. El objetivo de esta revisión es describir la prevalencia de C. trachomatis en estudios recientes en Chile, que utilicen para su detección reacción de polimerasa en cadena (RPC), revisar las posibles complicaciones perinatales asociadas, conocer las recomendaciones de tamizaje en gestantes en otros países y discutir la necesidad de incluir en nuestro país un programa de tamizaje prenatal.

Abstract Chlamydia trachomatis is the most frequent bacterial sexually transmitted disease around the world. Estimated prevalence by WHO is 4,2% for women. Most cases are asymptomatic, but complications in fertility and during pregnancy are possible. The aim of this review is to describe the prevalence of C. trachomatis in Chilean studies using polymerase chain reaction (PCR) for detection, to describe the possible perinatal complications, to know recommendations about pregnancy screening in other countries, and to discuss the possibility of implementing in Chile.

Electrocardiographic Recognition of Unprotected Left Main ST-Segment Elevation Myocardial Infarction: Looking Beyond aVR.

ST-segment elevation in aVR has traditionally been used for electrocardiographic identification of left main coronary artery (LM) myocardial infarction. We present two ST-segment elevation myocardial infarction (STEMI) cases with acute total occlusion of the LM without aVR ST-segment elevation. This report reviews the different electrocardiographic discriminators suggestive of unprotected LM STEMI. (Level of Difficulty: Intermediate.).

Integration of NMR studies, computational predictions, and in vitro assays in the search of marine diterpenes with antitumor activity.

Among the compounds of natural origin, diterpenes have proved useful as drugs for the treatment of cancer. Marine organisms, such as soft corals and algae, are a promising source of diterpenes, being a rich and unexplored source of cytotoxic agents. This study evaluated a library of 32 natural and semisynthetic marine diterpenes, including briarane, cembrane, and dolabellane nuclei, with the aim of determining their cytotoxicity against three human cancer cell lines (A549, MCF7, and PC3). The three most active compounds were submitted to a flow cytometry analysis in order to determine induction of apoptosis against the A549 cell line. An NMR analysis was conducted to determine and evaluate the interactions between active diterpenes and tubulin. These interactions were characterized by a computational study using molecular docking and MD simulations. With these results, two cembrane and one chlorinated briarane diterpenes were active against the three human cancer cell lines, induced apoptosis in the A549 cell line, and showed interactions with tubulin preferably at the taxane-binding site. This study is a starting point for the identification and optimization of the marine diterpenes selected for better antitumor activities. It also highlights the power of integrating NMR studies, computational predictions, and in vitro assays in the search for compounds with antitumor activity.

Sexually transmitted diseases during the COVID-19 pandemic: A focus on syphilis and gonorrhoea in Cuba.

OBJECTIVES: The implementation of social confinement measures to reduce the spread of coronavirus disease 2019 (COVID-19) has limited the clinical and laboratory diagnosis of sexually transmitted diseases (STDs) and their transmission. This study aims to explore the epidemiological behaviour of two notifiable STDs during the first 6 months of the COVID-19 pandemic in Cuba. STUDY DESIGN: This is an exploratory study of the incidence rates of syphilis and gonorrhoea during the COVID-19 pandemic in Cuba. METHODS: This study compares national weekly surveillance data on syphilis and gonorrhoea incidence rates in Cuba with the timeline of implemented social confinement measures. RESULTS: Incidence rates for both STDs were declining before the first case of COVID-19 was identified in Cuba. Following the confirmation of COVID-19 in Cuba and the implementation of social confinement measures, the decreasing incidence rates of syphilis and gonorrhoea continued. When social measures were subsequently relaxed, there was an increase in the incidence of syphilis, but incidence levels of gonorrhoea remained at a plateau. CONCLUSIONS: The results of this study suggest that the social measures introduced to curb the spread of COVID-19 influenced the sexual risk behaviours of individuals and subsequently modified the incidence of syphilis and gonorrhoea. It is necessary to continue epidemiological surveillance for longer periods of time and to explore it at the local, regional and national levels to better understand STDs in times of COVID-19.

Insights into Interactions of Flavanones with Target Human Respiratory Syncytial Virus M2-1 Protein from STD-NMR, Fluorescence Spectroscopy, and Computational Simulations.

The human Respiratory Syncytial Virus (hRSV) is the most frequent agent of respiratory infections in infants and children with no currently approved vaccine. The M2-1 protein is an important transcriptional antitermination factor and a potential target for viral replication inhibitor development. Hesperetin (HST) and hesperidin (HSD) are flavonoids from the flavanone group, naturally found in citrus and have, as one of their properties, antiviral activity. The present study reports on the interactions between hRSV M2-1 and these flavanones using experimental techniques in association with computational tools. STD-NMR results showed that HST and HSD bind to M2-1 by positioning their aromatic rings into the target protein binding site. Fluorescence quenching measurements revealed that HST had an interaction affinity greater than HSD towards M2-1. The thermodynamic analysis suggested that hydrogen bonds and van der Waals interactions are important for the molecular stabilization of the complexes. Computational simulations corroborated with the experimental results and indicated that the possible interaction region for the flavonoids is the AMP-binding site in M2-1. Therefore, these results point that HST and HSD bind stably to a critical region in M2-1, which is vital for its biological function, and thus might play a possible role antiviral against hRSV.

Nivel de conocimiento sobre métodos anticonceptivos y salud reproductiva en adolescentes mexicanos de medio rural / Level of knowledge about contraceptive methods and reproductive health in Mexican adolescents in rural area

INTRODUCCIÓN la información sobre anticoncepción es importante antes que se inicie la vida sexual. OBJETIVO determinar el nivel de conocimiento y uso de métodos anticonceptivos por adolescentes en medio rural. MÉTODOS estudio transversal analítico, se encuestó a adolescentes de 15-19 años de edad de ambos sexos, que asistían a un centro de salud rural, 70% sin vida sexual y 30% que ya habían iniciado su vida sexual. Se empleó una cuestionario auto-administrado que incluyó variables sociodemográficas, socioeducativas y de uso de métodos anticonceptivos. RESULTADOS el nivel de conocimientos fue medio en 38% y bajo en 31%. El condón fue el método anticonceptivo más utilizado (88%) y del que se tenía más conocimiento. Tiene un conocimiento bajo el 48,7%, el 30% y el 29,7% de adolescentes de 15, 16 y 17 años respectivamente. El conocimiento va aumentando con la edad; es "medio y alto" en 48,7% y 86,6% a los 15 y 19 años, respectivamente. Se observa que a mayor conocimiento, mayor uso de métodos anticonceptivos. CONCLUSIONES es necesaria mayor información sobre el uso adecuado de los métodos anticonceptivos en la escuela y en la familia a nivel rural antes del inicio de la vida sexual, para prevenir las enfermedades de transmisión sexual y los embarazos no deseados.

INTRODUCTION information on contraception is important before sexual life begins. OBJECTIVE to determine the level of knowledge and use of contraceptive methods by adolescents in rural areas. METHODS analytical cross-sectional study, surveyed adolescents aged 15-19 years of both sexes, who attended a rural health center, 70% without sexual life and 30% who had already started their sexual life. A self-administered questionnaire was used that included sociodemographic, socio-educational and use of contraceptive variables. RESULTS the level of knowledge was medium in 38% and low in 31%. The condom was the most widely used contraceptive method (88%) and the most widely known. 48,7%, 30%, and 29,7% of adolescents aged 15, 16, and 17, respectively, have low knowledge. Knowledge increases with age; it is "medium and high" in 48,7% and in 86,6% at 15 and 19 years, respectively. It is observed that the greater the knowledge, the more frequent use of contraceptive methods. CONCLUSIONS more information is needed on the proper use of contraceptive methods at school and in the family at the rural level before the start of sexual life, to prevent sexually transmitted diseases and unwanted pregnancies.

Grb2 dimer interacts with Coumarin through SH2 domains: A combined experimental and molecular modeling study.

Grb2 is an important regulator of normal vs. oncogenic cell signaling transduction. It plays a pivotal role on kinase-mediated signaling transduction by linking Receptor Tyrosine kinases to Ras/MAPK pathway which is known to bring oncogenic outcome. Coumarins are phenolic molecules found in several plants and seeds widely studied because of the antibiotic, anti-inflammatory, anticoagulant, vasodilator, and anti-tumor properties. Despite several studies about the anti-tumor properties of Coumarin in vivo and the role of Grb2 in signaling pathways related to cell proliferation, a molecular level investigation of the interaction between Grb2 and Coumarin is still missing. In this study, we performed a combined set of biophysical approaches to get insights on the interaction between Grb2 in a dimer state and Coumarin. Our results showed that Coumarin interacts with Grb2 dimer through its SH2 domain. The interaction is entropically driven, 1:1 molecular ratio and presents equilibrium constant of 105 M-1. In fact, SH2 is a well-known domain and a versatile signaling module for drug targeting which has been reported to bind compounds that block Ras activation in vivo. Despite we don't know the biological role coming from interaction between Grb2-SH2 domain and Coumarin, it is clear that this molecule could work in the same way as a SH2 domain inhibitor in order to block the link of Receptor Tyrosine kinases to Ras/MAPK pathway.

Transcriptional regulation of the Salmonella enterica std fimbrial operon by the RcsCDB system.

In Salmonella enterica serovar Typhimurium, the RcsCDB regulatory system controls the expression of genes involved in synthesis of colanic acid, formation of flagella and virulence. Here, we show that activation of the RcsCDB system downregulates expression of std, an operon that encodes fimbriae involved in Salmonella attachment to the mucus layer in the large intestine. Bioinformatic analysis predicts the existence of an RcsB-binding site located 180 bp upstream to the +1 transcription start site of the std promoter, and electrophoretic mobility shift assays confirm that RcsB binds the std promoter region in vitro. This study adds RcsB to the list of regulators of std transcription and provides an example of modulation of fimbriae synthesis by a signal transduction system.

Fish oil supplementation during adolescence attenuates metabolic programming of perinatal maternal high-fat diet in adult offspring.

Perinatal maternal high-fat diet (HFD) increases susceptibility to obesity and fatty liver diseases in adult offspring, which can be attenuated by the potent hypolipidaemic action of fish oil (FO), an n-3 PUFA source, during adult life. Previously, we described that adolescent HFD offspring showed resistance to FO hypolipidaemic effects, although FO promoted hepatic molecular changes suggestive of reduced lipid accumulation. Here, we investigated whether this FO intervention only during the adolescence period could affect offspring metabolism in adulthood. Then, female Wistar rats received isoenergetic, standard (STD: 9 % fat) or high-fat (HFD: 28·6 % fat) diet before mating, and throughout pregnancy and lactation. After weaning, male offspring received the standard diet; and from 25 to 45 d old they received oral administration of soyabean oil or FO. At 150 d old, serum and hepatic metabolic parameters were evaluated. Maternal HFD adult offspring showed increased body weight, visceral adiposity, hyperleptinaemia and decreased hepatic pSTAT3/STAT3 ratio, suggestive of hepatic leptin resistance. FO intake only during the adolescence period reduced visceral adiposity and serum leptin, regardless of maternal diet. Maternal HFD promoted dyslipidaemia and hepatic TAG accumulation, which was correlated with reduced hepatic carnitine palmitoyl transferase-1a content, suggesting lipid oxidation impairment. FO intake did not change serum lipids; however, it restored hepatic TAG content and hepatic markers of lipid oxidation to STD offspring levels. Therefore, we concluded that FO intake exclusively during adolescence programmed STD offspring and reprogrammed HFD offspring male rats to a healthier metabolic phenotype in adult life, reducing visceral adiposity, serum leptin and hepatic TAG content in offspring adulthood.