Priority pesticides in Chile: Predicting their environmental distribution, bioaccumulation, and transport potential.

Agriculture is one of the main economic activities in Chile and is associated with extensive use of pesticides, which can represent a risk to the environment and to human health. Currently, there are over 400 pesticides approved for commerce in Chile, including chemicals banned in other countries (e.g., flocoumafen and chlorfenapyr). An empirical analysis of their potential environmental effects is difficult due to this large number, thus opening the doors for the use of computational tools for prioritization efforts based on their persistence, bioaccumulation, and transport potential in the environment. The main objectives of this study were to estimate the properties and environmental distribution of pesticides approved for commerce in Chile and to generate a priority list for further evaluation in local environments. We used the Estimation Program Interface Suite interface to estimate the distribution coefficients, half-lives, and bioaccumulation potential of all pesticides registered in the Chilean Agriculture and Livestock Services. Additionally, the Pov & LRTP Screening Tool was used to estimate their overall persistence and long-range transport potential in the environment. The results were used to develop a P-B-lon range transport (LRT) score, which considered persistence, bioaccumulation, and long-range transport potential. All pesticides were compared to a group of polychlorinated biphenyls (PCBs), used as reference compounds, to generate a list of priority pesticides with persistent organic pollutants characteristics. The results showed that most pesticides were distributed between the organic phase and water, where they also showed the longest half-lives and bioaccumulation potential. A group of 21 pesticides showed relatively high P-B-LRT scores, compared to PCBs, and were classified as priority compounds. The list was further refined based on the volume of sales for each pesticide.  Integr Environ Assess Manag 2023;19:676-683. © 2022 The Authors. Integrated Environmental Assessment and Management published by Wiley Periodicals LLC on behalf of Society of Environmental Toxicology & Chemistry (SETAC).

Caracterización del acto suicida en el servicio médico legal de Concepción, Chile entre 2011-2015 / Characterization of the suicide act according to the autopsy reports released by the legal medical service of Concepción, Chile 2011-2015

INTRODUCCIÓN: El suicidio se define como el acto donde la propia persona se quita la vida intencionalmente. Actualmente es una problemática mundial y en aumento. El objetivo es caracterizar el acto suicida según los reportes de autopsias realizados por el Servicio Médico Legal (SML) Concepción, durante el periodo 2011-2015. MATERIAL Y MÉTODOS: Se realizó un estudio retrospectivo, descriptivo y trasversal de los informes de autopsia con causa suicidio realizadas por el SML Concepción, periodo 2011-2015 utilizándose las variables: genero, edad, procedencia, lugar de ocurrencia, estado civil, ocupación, patologías asociadas, causa de muerte, alcoholemia, examen toxicológico, llegada al centro asistencial, intentos previos y carta de aviso. Los datos se analizaron y tabularon mediante Microsoft Excel. El trabajo fue aprobado por comité de ética. RESULTADOS: Del total de autopsias 511 fueron suicidios, 83,3% eran hombres, edad promedio 44,8 años, 49,9% casados, 83,6% correspondían a la provincia de Concepción, 75% ocurrió en su domicilio, 88,8% causado por asfixia por ahorcamiento, 57,3% poseían alcoholemia negativa y 67,7% examen toxicológico negativo y solo un 5,1% llego a un centro asistencial. DISCUSIÓN: Las variables más prevalentes de nuestro estudio fueron edad de 20-29 años, género masculino, estado civil soltero y ocupación en empleo técnico. El método y lugar más frecuentes fueron el ahorcamiento y el domicilio respectivamente. Se observa una prevalencia mayor de intoxicación alcohólica que en cifras internacionales. La sustancia más prevalente en los análisis toxicológicos fue la cocaína. Se necesita ampliar la investigación en nuestro medio analizando factores de riesgo y diseñando nuevas estrategias de prevención

INTRODUCTION: Suicide can be defined as the act where the person finish their life intentionally. It is currently an increasing worldwide problematic. The objective is to characterize the suicide act according to the autopsies reports performed by the Legal Medical Service (SML) Concepción, during the period 2011-2015 MATERIAL AND METHOD: We released a retrospective, descriptive and transversal study with the autopsies reports performed by the SML Concepción described as suicide, between 2011­2015. We used variables such as: gender, age, procedence, place of ocurrence, marital state, occupation, comorbidities, death cause, blood alcohol concentration, toxicological results, arrival at a care center, previus attempts and warning letter. Data was analized and tabulated using Microsoft Excel. The study was previusly approved by an ethic committee. RESULTS: From the total autopsies released, 12.6% were suicides (511), from which 83.3% were men, 49.9% were married, 83.6% were from Concepcion, 75% of the suicides occurred at home, 88.8% were asphyxiation by hanging, 57.3% had a negative result of alcohol in blood and 67.7% had a negative toxicological test, 5.1% arrived at a care center. DISCUSSION: The most prevalent variables of our study were age 20-29, male gender, single marital status and occupation in technical employment. The most frequent method and place were hanging and domicile respectively. We observed a higher prevalence of alcohol intoxication than international studies. The most prevalent substance in the toxicological analyzes was cocaine. It is necessary to expand the research in our environment by analyzing risk factors and designing new prevention strategies.

Guías colombianas para el manejo del acné: una revisión basada en la evidencia por el Grupo Colombiano de Estudio en Acné

El acné es una enfermedad inflamatoria crónica que afecta, principalmente, adolescentes y adultos jóvenes. Se calcula que antes de los 21 años entre el 80 y el 90% de esta población ha estado expuesta a la enfermedad. Sin embargo, el acné puede persistir después de los 21 años y se sabe que 12% de las mujeres mayores de 25 años aún sufren de acné facial. El arsenal terapéutico para el acné consta de medicamentos tópicos y sistémicos que han demostrado su eficacia en la reducción de las lesiones. El mecanismo de acción de estos medicamentos está orientado, al menos, a uno de los cuatro factores fisiopatológicos reconocidos como responsables de la formación de las lesiones del acné, a saber: trastornos de la queratinización, hipersecreción sebácea, proliferación de Propionibacterium acnes o actividad inflamatoria in situ. La elección del tratamiento apropiado depende de varios factores, como la forma clínica de la enfermedad (de retención o inflamatoria), la gravedad de la misma y la respuesta del paciente a tratamientos previos. Asimismo, y entendiendo al acné como una enfermedad de carácter crónico, el tratamiento debe incluir una fase inicial con el objetivo de lograr una mayor reducción de la extensión y gravedad de las lesiones, y una fase de mantenimiento orientada a la prevención de las recaídas o exacerbaciones. Además, el resultado del tratamiento depende del cumplimiento del mismo y para lograrlo, es fundamental una adecuada relación médico-paciente. Este documento presenta el resultado de una revisión actualizada de la literatura, que incluye guías nacionales e internacionales para el manejo del acné y formula recomendaciones terapéuticas basadas en el mejor nivel de “evidencia” que se encontró. Su implementación permitirá la unificación de criterios con el objetivo de ofrecer un mejor manejo a los pacientes con la enfermedad, evitando así sus secuelas físicas y emocionales. Por otro lado, las guías presentan un marco científico y conceptual con la suficiente validez para su inclusión en los protocolos del plan obligatorio de salud.

Dermatilomanía y síndrome de Prader-Willi / Skin picking and Prader-Willi syndrome

Reportamos el caso de una mujer de 18 años con síndrome de Prader-Willi, con retardo mental, problemas de comportamiento –tales como hiperfagia y pellizcos en piel–, obesidad, hipogonadismo, estatura corta, manos pequeñas y ojos en “forma de almendra”; presentaba antecedentes de hipotonía en la edad neonatal. El síndrome de Prader-Willi es un trastorno congénito, raro, no hereditario, que afecta a 1 de cada 10.000 a 25.000 recién nacidos. Es causado por alteraciones en los genes paternos localizados en la región codificadora del cromosoma 15(q11.2-q13). Se caracteriza por hipotonía, retardo en el desarrollo, alteraciones en el comportamiento, obesidad, hiperfagia, facies característica, hipogonadismo, corta estatura y manifestaciones cutáneas.

Uso de anticuerpos monoclonales anti-CD20 (rituximab) en paciente con pénfigo vulgar grave / Use of monoclonal anti-CD20 (rituximab) in a patient with severe pemphigus vulgaris

El pénfigo vulgar es una enfermedad vesículo-ampollosa de carácter autoinmunitario que compromete la piel y las membranas mucosas, y presenta un curso crónico. La inmunopatogénesis se basa en la presencia de autoanticuerpos (IgG) producidos por linfocitos B y dirigidos contra la superficie de los queratinocitos, que generan pérdida de la adherencia intercelular y la formación de ampollas subepidérmicas. La morbimortalidad es variable, y es muy importante el manejo que se instaure. Se han utilizado múltiples tratamientos inmunosupresores, principalmente corticosteroides sistémicos y múltiples inmunorreguladores, sin embargo, en algunos casos resistentes o ante la presencia de efectos secundarios, la terapia inmunosupresora convencional es insuficiente para controlar la enfermedad y disminuir la morbimortalidad. Se presenta una revisión sobre el uso de anticuerpos monoclonales anti-CD20 de los linfocitos B (rituximab), para el manejo del pénfigo vulgar resistente y con mala respuesta a múltiples tratamientos convencionales a altas dosis y por periodos prolongados.

Hemangiomatosis neonatal benigna / Benign neonatal hemangiomatosis

La hemangiomatosis neonatal benigna es una rara enfermedad caracterizada por múltiples hemangiomas que se presentan exclusivamente en la piel, en contraste con la hemangiomatosis neonatal difusa que cursa con hemangiomas cutáneos y viscerales y es de mal pronóstico. Se describe a una lactante con hemangiomatosis neonatal benigna sin lesiones viscerales.

Microinjection of an antibody against the cysteine-protease involved in male chromatin remodeling blocks the development of sea urchin embryos at the initial cell cycle.

We reported recently that the inhibition of cysteine-proteases with E-64-d disturbs DNA replication and prevents mitosis of the early sea urchin embryo. Since E-64-d is a rather general inhibitor of thiol-proteases, to specifically target the cysteine-protease previously identified in our laboratory as the enzyme involved in male chromatin remodeling after fertilization, we injected antibodies against the N-terminal sequence of this protease that were able to inhibit the activity of this enzyme in vitro. We found that injection of these antibodies disrupts the initial zygotic cell cycle. As shown in this report in injected zygotes a severe inhibition of DNA replication was observed, the mitotic spindle was not correctly bipolarized the embryonic development was aborted at the initial cleavage division. Consequently, the injection of these antibodies mimics perfectly the effects previously described for E-64-d, indicating that the effects of this inhibitor rely mainly on the inhibition of the cysteine-protease involved in male chromatin remodeling after fertilization. These results further support the crucial role of this protease in early embryonic development.

Inhibition of cysteine protease activity disturbs DNA replication and prevents mitosis in the early mitotic cell cycles of sea urchin embryos.

Recent findings suggested that the role of cysteine proteases would not be limited to protein degradation in lysosomes but would also play regulatory functions in more specific cell mechanisms. We analyzed here the role of these enzymes in the control of cell cycle during embryogenesis. The addition of the potent cysteine protease inhibitor E64d to newly fertilized sea urchin eggs disrupted cell cycle progression, affecting nuclear as well as cytoplasmic characteristic events. Monitoring BrdU incorporation in E64d treated eggs demonstrated that DNA replication is severely disturbed. Moreover, this drug treatment inhibited male histones degradation, a step that is necessary for sperm chromatin remodeling and precedes the initiation of DNA replication in control eggs. This inhibition likely explains the DNA replication disturbance and suggests that S phase initiation requires cysteine protease activity. In turn, activation of the DNA replication checkpoint could be responsible for the consecutive block of nuclear envelope breakdown (NEB). However, in sea urchin early embryos this checkpoint doesn't control the mitotic cytoplasmic events that are not tightly coupled with NEB. Thus the fact that microtubule spindle is not assembled and cyclin B-cdk1 not activated under E64d treatment more likely rely on a distinct mechanism. Immunofluorescence experiments indicated that centrosome organization was deficient in absence of cysteine protease activity. This potentially accounts for mitotic spindle disruption and for cyclin B mis-localization in E64d treated eggs. We conclude that cysteine proteases are essential to trigger S phase and to promote M phase entry in newly fertilized sea urchin eggs.

Cysteine-protease involved in male chromatin remodeling after fertilization co-localizes with alpha-tubulin at mitosis.

We postulated an essential role for a cysteine-protease in sea urchins sperm histones degradation which follows fertilization. We now report the purification of this enzyme, the determination of its N-terminal amino acid sequence and the localization of the protein with antibodies generated against this amino-terminal peptide. The immunofluorescence data confirmed the presence of this enzyme in the nucleus of unfertilized eggs. After fertilization labeling is observed both in female and male pronuclei suggesting a rapid recruitment of the enzyme to the male pronuclei. Interestingly, we have found that this cysteine-protease persists in the nucleus of the zygotes during S phase of the cell cycle and co-localizes with alpha-tubulin that organizes the mitotic spindle during the initial embryonic cell division.