Brazilian mangrove sediments as a source of biosurfactant-producing yeast Pichia pseudolambica for bioremediation.

This work highlights the biosurfactant production potential of yeasts from mangroves in northeastern Brazil. The biosurfactants were evaluated by their emulsifying capacity (EI24), with 6 isolates showing values between 50% and 62%. Surfactant properties from crude extract were measured using drop collapse, oil displacement, Parafilm® M, surface tension and critical micellar concentration tests. The effects of temperature, salinity, pH, and the ability to emulsify different hydrocarbons were analyzed, showing a promising potential of the yeast species investigated to tolerance to high temperatures and acidic pH, in addition to emulsifying different sources of hydrocarbons with environmental impact. It is important to note that the Pichia pseudolambica isolates showed a remarkable ability to reduce the surface tension of water, from 70.82 mN/m to 36.47 mN/m. In addition, the critical micellar concentration (CMC) values ranged from 7 to 16 mg/mL, highlighting the promising surfactant activity of these isolates for future applications. It was identified that the biosurfactant adhered to the yeast cell wall, and FTIR and 1H NMR spectroscopy analysis was carried out on the yeast biomass and its post-sonication supernatant. The results indicate the presence of characteristic functional groups and peaks found in biosurfactants of a glycolipid nature. Taking together the results reveals the promising potential of biosurfactant biosynthesis of P. pseudolambica yeast, a trait not reported in the literature so far for this species. P. pseudolambica presents a relevant metabolic potential for alternative substrate use and resilience to adverse conditions that could enable it to produce biosurfactants for the biotechnological remediation of areas contaminated by oil derivatives. The metabolic properties herein investigated, together with their presence in Brazilian mangroves, make P. pseudolambica an emerging candidate for developing industrial processes and sustainable strategies for the recovery of ecosystems impacted by oil spills, being positioned as a sustainable alternative to conventional surfactants.

Thermoascus aurantiacus harbors an esterase/lipase that is highly activated by anionic surfactant.

Fungal lipolytic enzymes play crucial roles in various lipid bio-industry processes. Here, we elucidated the biochemical and structural characteristics of an unexplored fungal lipolytic enzyme (TaLip) from Thermoascus aurantiacus var. levisporus, a strain renowned for its significant industrial relevance in carbohydrate-active enzyme production. TaLip belongs to a poorly understood phylogenetic branch within the class 3 lipase family and prefers to hydrolyze mainly short-chain esters. Nonetheless, it also displays activity against natural long-chain triacylglycerols. Furthermore, our analyses revealed that the surfactant sodium dodecyl sulfate (SDS) enhances the hydrolytic activity of TaLip on pNP butyrate by up to 5.0-fold. Biophysical studies suggest that interactions with SDS may prevent TaLip aggregation, thereby preserving the integrity and stability of its monomeric form and improving its performance. These findings highlight the resilience of TaLip as a lipolytic enzyme capable of functioning in tandem with surfactants, offering an intriguing enzymatic model for further exploration of surfactant tolerance and activation in biotechnological applications.

The combined effect of pH and NaCl on the susceptibility of Listeria monocytogenes to rhamnolipids.

The use of natural and sustainable additives, that are less aggressive to the environment, is a trend in the food industry. Rhamnolipids (RL) biosurfactants have shown potential for controlling food pathogens however, due to the presence of free carboxyl groups, the pH and ionic strength may influence the properties of such surfactants. In this study, we describe the antimicrobial activity of RL under different pH values and NaCl concentrations, towards both planktonic and biofilms of Listeria monocytogenes. RL were effective at pH 5.0 and the addition of 5 % NaCl improved the bactericidal efficacy for planktonic and sessile cells. The effect of NaCl was more pronounced at pH above 6 showing a significant increase in RL antimicrobial activity. At pH 7.0 planktonic population was eradicated by RL only when salt was present whereas biofilm viability was decreased by 5 log with MBIC varying from > 2500.0 mg/L (RL) to 39.0 mg/L (RL + 5 % NaCl). Larger vesicular and lamellar RL self-assembly structures were predominant when NaCl was present, suggesting their association with the antimicrobial activity observed. The pH and ionic strength of the medium are important parameters to be considered for the development of RL-based strategies to control L. monocytogenes.

Effects of sodium dodecylbenzene sulfonate (SDBS), active principle of detergents, on the liver and kidney of zebrafish (Danio rerio).

Sodium dodecylbenzene sulfonate (SDBS), a predominant component in detergents, requires an evaluation of its toxicological potential due to its hazardous environmental levels. Therefore, we evaluated the toxicological effects of SDBS on the liver and kidney of male D. rerio. Therefore, we evaluated the toxicological effects of SDBS on the liver and kidney of male D. rerio. The fish were divided into three groups: 0.0 (control), 0.25, and 0.5 mg/L of SDBS with exposure for up to 96 hours. After exposure, histopathological, histochemical (hepatic glycogen content), and biochemical analyses (SOD and CAT enzyme analysis) were performed on both organs. The results showed significant histopathological effects, such as circulatory disturbances and progressive and regressive alterations, leading to an altered histopathological alteration index. SOD and CAT enzymes exhibited prominent changes. Thus, it became clear that the surfactant SDBS can cause serious hepatic and renal problems in D. rerio fish, even with short-term exposure, necessitating more stringent control and regulation in the disposal of this surfactant.

Oral DHA supplementation and retinopathy of prematurity: the Joinville DHA Clinical Trial.

Retinopathy of prematurity (ROP) is a leading cause of blindness in premature infants. The condition is associated with DHA deficiency. This study aimed to investigate the effect of DHA supplementation on the occurrence of ROP in infants receiving oral oil drops. It is part of the Joinville DHA study, a non-parallel-group cohort study conducted from March 2020 to January 2023 at a public maternity hospital in Brazil. Infants born before 33 weeks of gestational age or with a birth weight ≤ 1500 g were recruited. Among 155 infants, 81 did not receive and 74 received DHA supplementation until complete vascularisation of the peripheral retina. There was a higher incidence of infants with ROP in the unsupplemented group (58·6 %) compared with the DHA group (41·4 %), but this difference was NS (P = 0·22). Unadjusted logistic regression analysis showed that patent ductus arteriosus and neonatal corticosteroids were significantly (P < 0·05) associated with ROP in both groups. In the DHA group, surfactant use was also associated with ROP (P = 0·003). After adjusting for important covariates, patent ductus arteriosus and neonatal corticosteroids continued to be significant for infants in the unsupplemented group (OR = 3·99; P = 0·022 and OR = 5·64; P = 0·019, respectively). In the DHA group, only surfactant use continued to be associated with ROP (OR = 4·84; P = 0·015). In summary, DHA supplementation was not associated with ROP. Further studies are necessary to better understand the relationship between DHA supplementation, ROP and associated comorbidities.

Use of nitrate, sulphate, and iron (III) as electron acceptors to improve the anaerobic degradation of linear alkylbenzene sulfonate: effects on removal potential and microbiota diversification.

Linear alkylbenzene sulfonate (LAS) is a synthetic anionic surfactant that is found in certain amounts in wastewaters and even in water bodies, despite its known biodegradability. This study aimed to assess the influence of nitrate, sulphate, and iron (III) on LAS anaerobic degradation and biomass microbial diversity. Batch reactors were inoculated with anaerobic biomass, nutrients, LAS (20 mg L-1), one of the three electron acceptors, and ethanol (40 mg L-1) as a co-substrate. The control treatments, with and without co-substrate, showed limited LAS biodegradation efficiencies of 10 ± 2% and 0%, respectively. However, when nitrate and iron (III) were present without co-substrate, biodegradation efficiencies of 53 ± 4% and 75 ± 3% were achieved, respectively, which were the highest levels observed. Clostridium spp. was prominent in all treatments, while Alkaliphilus spp. and Bacillus spp. thrived in the presence of iron, which had the most significant effect on LAS biodegradation. Those microorganisms were identified as crucial in affecting the LAS anaerobic degradation. The experiments revealed that the presence of electron acceptors fostered the development of a more specialised microbiota, especially those involved in the LAS biodegradation. A mutual interaction between the processes of degradation and adsorption was also shown.

Estrategias de oxigenoterapia y soporte ventilatorio, en cuidado intensivo neonatal post administración de surfactante pulmonar / Oxygen therapy and respiratory support strategies after the administration of a pulmonary surfactant in a neonatal intensive care unit / Oxigenoterapia e estratégias de suporte ventilatório em terapia intensiva neonatal após administração de surfactante pulmonar

Introducción: Las estrategias ventilatorias y de oxigenoterapia utilizadas en recién nacidos pretérmino, favorecen la ventilación y oxigenación alveolar, influyendo en los cambios clínicos y hemodinámicos del paciente. Objetivo: Determinar las estrategias ventilatorias y de oxigenoterapia utilizadas pos-administración de surfactante pulmonar en recién nacidos que ingresaron a la Unidad de Cuidado Intensivo Neonatal del Hospital Universitario San Rafael de Tunja. Materiales y métodos: Estudio retrospectivo transversal correlacional, muestreo no probabilístico por conveniencia, con 172 registros de pacientes, análisis univariado con medidas de tendencia central y correlación con método de Wilcoxon. Resultados: Predominó el sexo masculino, casi la totalidad presentó déficit de surfactante pulmonar con sobrevida. Los recién nacidos tuvieron en promedio 30 semanas de edad gestacional y 1532 g. La mayoría requirió ventilación mecánica invasiva y no invasiva, las estrategias ventilatorias y de oxigenación más utilizadas fueron ventilación con presión positiva intermitente y la cánula nasal convencional. Finalmente, existió relación entre peso y edad gestacional con el tipo de surfactante pulmonar, estrategias ventilatorias y desenlace clínico del recién nacido. Conclusiones: El peso al nacer y la edad gestacional fueron indicadores significativos para determinar el tipo de surfactante pulmonar a administrar, las estrategias ventilatorias, de oxigenoterapia y el desenlace clínico del paciente.

Introduction: The preferred ventilation and oxygen therapy strategies for preterm newborns are ventilation and alveolar oxygenation, which trigger clinical and hemodynamic changes in patients. Objective: To determine the ventilation and oxygen therapy strategies applied after the administration of a pulmonary surfactant in newborns admitted to the Neonatal Intensive Care Unit of the San Rafael Hospital of Tunja (Colombia). Materials and methods: A retrospective cross-sectional and correlational study using a non-probabilistic sampling for convenience and 172 patient records. A univariate analysis through the Wilcoxon method was used, taking into account central tendency and correlation measures. Results: Most patients were male and almost all showed pulmonary surfactant deficiency with survival. The gestational age and average weight were 30 weeks and 1,532 g, respectively. Most required invasive and non-invasive mechanical ventilation, being intermittent positive pressure ventilation and conventional nasal cannula the most commonly used ventilation and oxygenation strategies. Finally, there was a relationship between weight and gestational age with the type of pulmonary surfactant, ventilation strategies, and the clinical outcome of the newborn. Conclusions: Birth weight and gestational age were significant indicators to determine the type of pulmonary surfactant to be administered, the ventilation and oxygen therapy strategies, and the patient's clinical outcome.

Introdução: As estratégias ventilatórias e de oxigenoterapia utilizadas em recém-nascidos prematuros favorecem a ventilação e a oxigenação alveolar, influenciando nas alterações clínicas e hemodinâmicas do paciente. Objetivo: Determinar as estratégias ventilatórias e de oxigenoterapia utilizadas após a administração de surfactante pulmonar em recém-nascidos internados na Unidade de Terapia Intensiva Neonatal do Hospital Universitário San Rafael de Tunja. Materiais e métodos: Estudo correlacional transversal retrospectivo, amostragem não probabilística por conveniência, 172 prontuários, análise univariada considerando medidas de tendência central e correlação com o método de Wilcoxon. Resultados: Predominou o sexo masculino, quase todos apresentaram deficiência de surfactante pulmonar com sobrevida. A idade gestacional e peso médio de 30 semanas e 1532 g. A maioria necessitou de ventilação mecânica invasiva e não invasiva, as estratégias de ventilação e oxigenação mais utilizadas foram ventilação com pressão positiva intermitente e cânula nasal convencional. Por fim, houve relação entre peso e idade gestacional com o tipo de surfactante pulmonar, estratégias ventilatórias e evolução clínica do recém-nascido. Conclusões: O peso ao nascer e a idade gestacional são indicadores significativos para determinar o tipo de surfactante pulmonar a ser administrado, as estratégias ventilatórias e de oxigenoterapia e a evolução clínica do paciente.

Analysis of the changes in the management of preterm newborns born in a Spanish third-level hospital in the past 10 years.

BACKGROUND: Preterm newborns require the use of the best and most current strategies to treat and prevent both acute pathology and associated sequelae. This study aimed to compare the differences in the management of preterm newborns over 10 years in a tertiary hospital in Spain and its impact on height, weight, and neurological development in the medium term. METHODS: We conducted a retrospective, observational, and analytical study examining the management and clinical variables in preterm newborns under 32 weeks of gestational age who were born in our hospital in 2011 and 2021. RESULTS: Twenty-six newborns were included in the study. Significant differences in magnesium sulfate use, continuous positive airway pressure immediately after birth, and non-invasive mechanical ventilation during hospitalization were observed. Differences were found in the use of parenteral nutrition and the timing of initiation of enteral feeding. We did not observe differences in the neurological or weight evolution in the medium term. CONCLUSIONS: Significant differences in managing preterm newborns in these 10 years were observed. Lower mortality and alterations in central nervous system ultrasound and, significantly, less growth retardation during admission in 2021 have been observed; however, it does not manifest with improvement in long-term somatometrics or neurological prognosis.

INTRODUCCIÓN: La inmadurez de los recién nacidos pretérmino (RNP) requiere el empleo de las mejores y más actuales estrategias para tratar la patología aguda y prevenir sus eventuales secuelas asociadas. El objetivo planteado es comparar las diferencias en el manejo de RNP a lo largo de diez años en un hospital de tercer nivel en España y su impacto en el desarrollo neurológico y póndero-estatural a medio plazo. MÉTODOS: Estudio retrospectivo, observacional y analítico examinando variables del manejo y clínicas de todos los RNP menores de 32 semanas de edad gestacional nacidos en nuestro hospital (nivel III-A) en 2011 y en 2021. RESULTADOS: Se incluyeron 26 infantes (2011: 10 niños, 2021: 16 niños). Observamos diferencias significativas en el uso prenatal de sulfato de magnesio, mayor uso de presión positiva continua en la vía aérea (CPAP) al ingreso y ventilación mecánica no invasiva durante el ingreso, retraso en el uso de surfactante, empleo de alimentación intravenosa e inicio precoz de la alimentación enteral. Existe una menor tasa de mortalidad y desnutrición postnatal en 2021. No observamos diferencias en la evolución neurológica o ponderal a medio plazo. CONCLUSIONES: Existen diferencias en el manejo de los prematuros en estos 10 años con mayor ajuste a las guías nacionales e internacionales vigentes. Esto se relaciona con menor mortalidad y alteraciones en la ecografía del sistema nervioso central y, significativamente, con un menor retraso en el crecimiento durante el ingreso en 2021; no se demostró mejoría del pronóstico somatométrico o neurológico a largo plazo.

Lung tissue expression of epithelial injury markers is associated with acute lung injury severity but does not discriminate sepsis from ARDS.

BACKGROUND: Acute respiratory distress syndrome (ARDS) is a common cause of respiratory failure in critically ill patients, and diffuse alveolar damage (DAD) is considered its histological hallmark. Sepsis is one of the most common aetiology of ARDS with the highest case-fatality rate. Identifying ARDS patients and differentiate them from other causes of acute respiratory failure remains a challenge. To address this, many studies have focused on identifying biomarkers that can help assess lung epithelial injury. However, there is scarce information available regarding the tissue expression of these markers. Evaluating the expression of elafin, RAGE, and SP-D in lung tissue offers a potential bridge between serological markers and the underlying histopathological changes. Therefore, we hypothesize that the expression of epithelial injury markers varies between sepsis and ARDS as well as according to its severity. METHODS: We compared the post-mortem lung tissue expression of the epithelial injury markers RAGE, SP-D, and elafin of patients that died of sepsis, ARDS, and controls that died from non-pulmonary causes. Lung tissue was collected during routine autopsy and protein expression was assessed by immunohistochemistry. We also assessed the lung injury by a semi-quantitative analysis. RESULTS: We observed that all features of DAD were milder in septic group compared to ARDS group. Elafin tissue expression was increased and SP-D was decreased in the sepsis and ARDS groups. Severe ARDS expressed higher levels of elafin and RAGE, and they were negatively correlated with PaO2/FiO2 ratio, and positively correlated with bronchopneumonia percentage and hyaline membrane score. RAGE tissue expression was negatively correlated with mechanical ventilation duration in both ARDS and septic groups. In septic patients, elafin was positively correlated with ICU admission length, SP-D was positively correlated with serum lactate and RAGE was correlated with C-reactive protein. CONCLUSIONS: Lung tissue expression of elafin and RAGE, but not SP-D, is associated with ARDS severity, but does not discriminate sepsis patients from ARDS patients.

Emerging pollutants in textile wastewater: an ecotoxicological assessment focusing on surfactants.

Water and several chemicals, including dyestuffs, surfactants, acids, and salts, are required during textile dyeing processes. Surfactants are harmful to the aquatic environment and induce several negative biological effects in exposed biota. In this context, the present study aimed to assess acute effects of five surfactants, comprising anionic and nonionic classes, and other auxiliary products used in fiber dyeing processes to aquatic organisms Vibrio fischeri (bacteria) and Daphnia similis (cladocerans). The toxicities of binary surfactant mixtures containing the anionic surfactant dodecylbenzene sulfonate + nonionic fatty alcohol ethoxylate and dodecylbenzene sulfonate + nonionic alkylene oxide were also evaluated. Nonionic surfactants were more toxic than anionic compounds for both organisms. Acute nonionic toxicity ranged from 1.3 mg/L (fatty alcohol ethoxylate surfactant) to 2.6 mg/L (ethoxylate surfactant) for V. fischeri and from 1.9 mg/L (alkylene oxide surfactant) to 12.5 mg/L (alkyl aryl ethoxylated and aromatic sulfonate surfactant) for D. similis, while the anionic dodecylbenzene sulfonate EC50s were determined as 66.2 mg/L and 19.7 mg/L, respectively. Both mixtures were very toxic for the exposed organisms: the EC50 average in the anionic + fatty alcohol ethoxylate mixture was of 1.0 mg/L ± 0.11 for V. fischeri and 4.09 mg/L ± 0.69 for D. similis. While the anionic + alkylene oxide mixture, EC50 of 3.34 mg/L for D. similis and 3.60 mg/L for V. fischeri. These toxicity data suggested that the concentration addition was the best model to explain the action that is more likely to occur for mixture for the dodecylbenzene sulfonate and alkylene oxide mixtures in both organisms. Our findings also suggest that textile wastewater surfactants may interact and produce different responses in aquatic organisms, such as synergism and antagonism. Ecotoxicological assays provide relevant information concerning hazardous pollutants, which may then be adequately treated and suitably managed to reduce toxic loads, associated to suitable management plans.

Surfactant therapy using vibrating-mesh nebulizers in adults with COVID-19-induced ARDS: A case series.

Coronavirus adult respiratory distress syndrome, characterized by decreased surfactant due to lysis of type II pneumocytes and hyaline membrane formation, contributes to severe hypoxemia. The administration of surfactant via high-flow nasal cannula (HFNC) may positively affect lung structure and function in this context. In this study, we report on five clinical cases, encompassing patients aged 40-60 years of both sexes, who tested positive for coronavirus disease 2019 via real-time polymerase chain reaction and exhibited significant pulmonary compromise with elevated inflammatory biomarkers. These patients were treated with aerosol therapy using surfactant delivered through vibrating-mesh nebulizers alongside HFNC. Of these patients, four demonstrated positive responses to the treatment, suggesting that aerosol therapy with surfactant through vibrating-mesh nebulizers could be a viable rescue therapy in adults receiving HFNC oxygen therapy for hypoxemic respiratory failure caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Unfortunately, one patient had a negative outcome and succumbed. The findings from these cases indicate that the use of aerosol therapy with vibrating-mesh nebulizers as rescue therapy might offer an alternative approach for managing adults with hypoxemic respiratory failure due to SARS-CoV-2, as evidenced by the positive outcomes in four out of the five cases presented.

Sodium dodecylbenzene sulphonate (SDBS) present in detergents: action on the gills, skin, and blood of D. rerio fish.

1. Sodium dodecylbenzene sulphonate (SDBS) is one of the surfactants used worldwide in detergents which, due to high residual discharges, has great potential to cause ecotoxicological impacts. Therefore, the sublethal effects of SDBS on the gills and skin of male Danio rerio fish were investigated.2. The fish were distributed into three groups: GC (control), GT1 (0.25 mg/L of SDBS), and GT2 (0.5 mg/L of SDBS) and exposed for 21 days. After the experiment, histopathological analyses of the gills, histochemical analyses (counting of mucous cells), and biochemical analyses (antioxidant defense enzyme analysis, SOD, and CAT) were conducted.3. A significant increase (p < 0.05) in the incidence of circulatory disorders, progressive, and regressive alterations occurred in the GT1 and GT2 groups. Due to these changes, the total histopathological index of the gills was higher in these groups. Mucous cells in the gills and skin increased. There was an increase in SOD activity and a reduction in CAT activity in these groups. Haematology revealed neutrophilia and lymphocytosis in the blood of GT1 and GT2.4. The results clearly demonstrate that a 21-day exposure to SDBS causes severe morphophysiological damage to the gills, skin, and blood of D. rerio fish.

Effects of sodium dodecylbenzene sulfonate (SDBS) on zebrafish (Danio rerio) gills and blood.

Sodium dodecylbenzene sulfonate (SDBS) is an important surfactant used as a cleaning agent and industrial additive to remove unwanted chemicals which have been detected in the aquatic environment. The aim of this study was to examine the toxicological potential of SDBS on the gills of adult male zebrafish (Danio rerio) exposed to this chemical. For the 96 hr acute exposure, fish were divided into three groups: control, 0.25 mg/L, and 0.5 mg/L of SDBS. After the experiment, morphophysiological analyses (gill histopathology and histochemistry), oxidative stress (determination of gill activities of superoxide dismutase (SOD) and catalase (CAT)), and hematological analyses (leukocyte differentiation) were conducted. Data demonstrated that SDBS at both tested concentrations altered the histopathological index and initiated circulatory disturbances, as well as adverse, progressive, and immunological changes in the gills. In the 0.5 mg/L group, SOD activity decreased significantly, but CAT activity was not altered. Prominent blood changes observed in this group were neutrophilia and lymphocytosis. The number of mucous and chloride cells increased significantly in both groups. Taken together, our findings demonstrated that exposure of D. rerio to SDBS, even for 96 hr, produced adverse morphological and hematological effects associated with a reduction in SOD activity. Our findings indicate that exposure of aquatic species to the anionic surfactant SDBS may lead to adverse consequences associated with oxidative stress. Therefore, this study highlights the risks that this substance may pose to aquatic ecosystems and emphasizes the need for further investigations and strict regulations on its disposal.

Analysis of the changes in the management of preterm newborns born in a Spanish third-level hospital in the past 10 years / Análisis de los cambios en el manejo de recién nacidos prematuros nacidos en un hospital español de tercer nivel en los últimos 10 años

Abstract Background: Preterm newborns require the use of the best and most current strategies to treat and prevent both acute pathology and associated sequelae. This study aimed to compare the differences in the management of preterm newborns over 10 years in a tertiary hospital in Spain and its impact on height, weight, and neurological development in the medium term. Methods: We conducted a retrospective, observational, and analytical study examining the management and clinical variables in preterm newborns under 32 weeks of gestational age who were born in our hospital in 2011 and 2021. Results: Twenty-six newborns were included in the study. Significant differences in magnesium sulfate use, continuous positive airway pressure immediately after birth, and non-invasive mechanical ventilation during hospitalization were observed. Differences were found in the use of parenteral nutrition and the timing of initiation of enteral feeding. We did not observe differences in the neurological or weight evolution in the medium term. Conclusions: Significant differences in managing preterm newborns in these 10 years were observed. Lower mortality and alterations in central nervous system ultrasound and, significantly, less growth retardation during admission in 2021 have been observed; however, it does not manifest with improvement in long-term somatometrics or neurological prognosis.

Resumen Introducción: La inmadurez de los recién nacidos pretérmino (RNP) requiere el empleo de las mejores y más actuales estrategias para tratar la patología aguda y prevenir sus eventuales secuelas asociadas. El objetivo planteado es comparar las diferencias en el manejo de RNP a lo largo de diez años en un hospital de tercer nivel en España y su impacto en el desarrollo neurológico y póndero-estatural a medio plazo. Métodos: Estudio retrospectivo, observacional y analítico examinando variables del manejo y clínicas de todos los RNP menores de 32 semanas de edad gestacional nacidos en nuestro hospital (nivel III-A) en 2011 y en 2021. Resultados: Se incluyeron 26 infantes (2011: 10 niños, 2021: 16 niños). Observamos diferencias significativas en el uso prenatal de sulfato de magnesio, mayor uso de presión positiva continua en la vía aérea (CPAP) al ingreso y ventilación mecánica no invasiva durante el ingreso, retraso en el uso de surfactante, empleo de alimentación intravenosa e inicio precoz de la alimentación enteral. Existe una menor tasa de mortalidad y desnutrición postnatal en 2021. No observamos diferencias en la evolución neurológica o ponderal a medio plazo. Conclusiones: Existen diferencias en el manejo de los prematuros en estos 10 años con mayor ajuste a las guías nacionales e internacionales vigentes. Esto se relaciona con menor mortalidad y alteraciones en la ecografía del sistema nervioso central y, significativamente, con un menor retraso en el crecimiento durante el ingreso en 2021; no se demostró mejoría del pronóstico somatométrico o neurológico a largo plazo.

Less invasive surfactant administration versus intubation-surfactant-extubation in the treatment of neonatal respiratory distress syndrome: a systematic review and meta-analyses.

OBJECTIVES: To compare LISA with INSURE technique for surfactant administration in preterm with gestational age (GA) < 36 weeks with RDS in respect to the incidence of pneumothorax, bronchopulmonary dysplasia (BPD), need for mechanical ventilation (MV), regional cerebral oxygen saturation (rSO2), peri­intraventricular hemorrhage (PIVH) and mortality. METHODS: A systematic search in PubMed, Embase, Lilacs, CINAHL, SciELO databases, Brazilian Registry of Randomized Clinical Trials (ReBEC), Clinicaltrials.gov, and Cochrane Central Register of Controlled Trials (CENTRAL) was performed. RCTs evaluating the effects of the LISA technique versus INSURE in preterm infants with gestational age < 36 weeks and that had as outcomes evaluation of the rates of pneumothorax, BPD, need for MV, rSO2, PIVH, and mortality were included in the meta-analysis. Random effects and hazard ratio models were used to combine all study results. Inter-study heterogeneity was assessed using Cochrane Q statistics and Higgin's I2 statistics. RESULTS: Sixteen RCTs published between 2012 and 2020 met the inclusion criteria, a total of 1,944 preterms. Eleven studies showed a shorter duration of MV and CPAP in the LISA group than in INSURE group. Two studies evaluated rSO2 and suggested that LISA and INSURE transiently affect brain autoregulation during surfactant administration. INSURE group had a higher risk for MV in the first 72 h of life, pneumothorax, PIVH and mortality in comparison to the LISA group. CONCLUSION: This systematic review and meta-analyses provided evidence for the benefits of the LISA technique in the treatment of RDS, decreasing CPAP time, need for MV, BPD, pneumothorax, PIVH, and mortality when compared to INSURE.

Less invasive surfactant administration versus intubation-surfactant-extubation in the treatment of neonatal respiratory distress syndrome: a systematic review and meta-analyses

Abstract Objectives To compare LISA with INSURE technique for surfactant administration in preterm with gestational age (GA) < 36 weeks with RDS in respect to the incidence of pneumothorax, bronchopulmonary dysplasia (BPD), need for mechanical ventilation (MV), regional cerebral oxygen saturation (rSO2), peri‑intraventricular hemorrhage (PIVH) and mortality. Methods A systematic search in PubMed, Embase, Lilacs, CINAHL, SciELO databases, Brazilian Registry of Randomized Clinical Trials (ReBEC), Clinicaltrials.gov, and Cochrane Central Register of Controlled Trials (CENTRAL) was performed. RCTs evaluating the effects of the LISA technique versus INSURE in preterm infants with gestational age < 36 weeks and that had as outcomes evaluation of the rates of pneumothorax, BPD, need for MV, rSO2, PIVH, and mortality were included in the meta-analysis. Random effects and hazard ratio models were used to combine all study results. Inter-study heterogeneity was assessed using Cochrane Q statistics and Higgin's I2 statistics. Results Sixteen RCTs published between 2012 and 2020 met the inclusion criteria, a total of 1,944 preterms. Eleven studies showed a shorter duration of MV and CPAP in the LISA group than in INSURE group. Two studies evaluated rSO2 and suggested that LISA and INSURE transiently affect brain autoregulation during surfactant administration. INSURE group had a higher risk for MV in the first 72 h of life, pneumothorax, PIVH and mortality in comparison to the LISA group. Conclusion This systematic review and meta-analyses provided evidence for the benefits of the LISA technique in the treatment of RDS, decreasing CPAP time, need for MV, BPD, pneumothorax, PIVH, and mortality when compared to INSURE.

Nanoemulsions of synthetic rhamnolipids act as plant resistance inducers without damaging plant tissues or affecting soil microbiota.

Plant pathogens and pests can cause significant losses in crop yields, affecting food security and the global economy. Many traditional chemical pesticides are used to combat these organisms. This can lead to the development of pesticide-resistant strains of pathogens/insects and negatively impact the environment. The development of new bioprotectants, which are less harmful to the environment and less likely to lead to pesticide-resistance, appears as a sustainable strategy to increase plant immunity. Natural Rhamnolipids (RL-Nat) are a class of biosurfactants with bioprotectant properties that are produced by an opportunistic human pathogen bacterium. RL-Nat can act as plant resistance inducers against a wide variety of pathogens. Recently, a series of bioinspired synthetic mono-RLs produced by green chemistry were also reported as phytoprotectants. Here, we explored their capacity to generate novel colloidal systems that might be used to encapsulate bioactive hydrophobic compounds to enhance their performance as plant bioprotectants. The synthetic mono-RLs showed good surfactant properties and emulsification power providing stable nanoemulsions capable of acting as bio-carriers with good wettability. Synthetic RLs-stabilized nanoemulsions were more effective than RLs suspensions at inducing plant immunity, without causing deleterious effects. These nanoemulsions were innocuous to native substrate microbiota and beneficial soil-borne microbes, making them promising safe bio-carriers for crop protection.

Bioremediation of Automotive Residual Oil-Contaminated Soils by Biostimulation with Enzymes, Surfactant, and Vermicompost.

Contamination of soils by automotive residual oil represents a global environmental problem. Bioremediation is the technology most suitable to remove this contaminant from the medium. Therefore, this work aimed to evaluate the effectiveness of bioremediation of automotive residual oil-contaminated soils by biostimulation with enzymes, surfactant, and vermicompost. The bioremediation efficiency was examined using a factorial design of 24 to determine the effect of the time, pH and temperature conditions, biostimulation with enzyme-vermicompost, and biostimulation with enzyme-surfactant. Enzymes obtained from Ricinus communis L. seeds, commercial vermicompost, and Triton X-100 were used. Results showed that the highest removal efficiency (99.9%) was achieved at 49 days, with a pH of 4.5, temperature of 37 °C, and using biostimulation with enzyme-vermicompost (3% w/v-5% w/w). The addition of surfactant was not significant in increasing the removal efficiency. Therefore, the results provide adequate conditions to bioremediate automotive residual oil-contaminated soils by biostimulation using enzymes supported with vermicompost.

Novel opportunities from bioimaging to understand the trafficking and maturation of intracellular pulmonary surfactant and its role in lung diseases.

Pulmonary surfactant (PS), a complex mixture of lipids and proteins, is essential for maintaining proper lung function. It reduces surface tension in the alveoli, preventing collapse during expiration and facilitating re-expansion during inspiration. Additionally, PS has crucial roles in the respiratory system's innate defense and immune regulation. Dysfunction of PS contributes to various respiratory diseases, including neonatal respiratory distress syndrome (NRDS), adult respiratory distress syndrome (ARDS), COVID-19-associated ARDS, and ventilator-induced lung injury (VILI), among others. Furthermore, PS alterations play a significant role in chronic lung diseases such as chronic obstructive pulmonary disease (COPD) and idiopathic pulmonary fibrosis (IPF). The intracellular stage involves storing and releasing a specialized subcellular organelle known as lamellar bodies (LB). The maturation of these organelles requires coordinated signaling to organize their intracellular organization in time and space. LB's intracellular maturation involves the lipid composition and critical processing of surfactant proteins to achieve proper functionality. Over a decade ago, the supramolecular organization of lamellar bodies was studied using electron microscopy. In recent years, novel bioimaging tools combining spectroscopy and microscopy have been utilized to investigate the in cellulo intracellular organization of lamellar bodies temporally and spatially. This short review provides an up-to-date understanding of intracellular LBs. Hyperspectral imaging and phasor analysis have allowed identifying specific transitions in LB's hydration, providing insights into their membrane dynamics and structure. A discussion and overview of the latest approaches that have contributed to a new comprehension of the trafficking and structure of lamellar bodies is presented.

Exogenous surfactant reduces inflammation and redox imbalance in rats under prone or supine mechanical ventilation.

Mechanical ventilation (MV) is a lifesaving therapy for patients with acute or chronic respiratory failure. Despite, it can also cause lung injury by inducing or worsening inflammatory responses and oxidative stress. Several clinical approaches have protective effects on the lungs, including the prone position and exogenous surfactant; however, few studies have evaluated the association between the two strategies, especially in individuals without previous lung injury. We tested the hypothesis that the effects of the homogenization in lung aeration caused by the prone position in association with the anti-inflammatory properties of exogenous surfactant pre-treatment could have a cumulative protective effect against ventilator-induced lung injury. Therefore, Wistar rats were divided into four experimental groups: Mechanical Ventilation in Supine Position (MVSP), Mechanical Ventilation in Prone position (MVPP), Mechanical Ventilation in Supine Position + surfactant (MVSPS), and Mechanical Ventilation in Prone Position + Surfactant (MVPPS). The intranasal instillation of a porcine surfactant (Curosurf®) was performed in the animals of MVSPS and MVPPS 1 h before the MV, all the rats were subjected to MV for 1 h. The prone position in association with surfactant decreased mRNA expression levels of pro-inflammatory cytokines in ventilated animals compared to the supine position; in addition, the NfκB was lower in MVPP, MVSPS and MVPPS when compared to MVSP. However, it had no effects on oxidative stress caused by MV. Pre-treatment with exogenous surfactant was more efficient in promoting lung protection than the prone position, as it also reduced oxidative damage in the lung parenchyma. Nevertheless, the surfactant did not cause additional improvements in most parameters that were also improved by the prone position. Our results indicate that the pre-treatment with exogenous surfactant, regardless of the position adopted in mechanical ventilation, preserves the original lung histoarchitecture, reduces redox imbalance, and reduces acute inflammatory responses caused by mechanical ventilation in healthy adult Wistar rats.