Lipid signature associated with chronic colon inflammation reveals a dysregulation in colonocyte differentiation process.

Inflammatory Bowel Disease (IBD) comprises a heterogeneous group of chronic inflammatory conditions of the gastrointestinal tract that include ulcerative colitis (UC) and Crohn's disease. Although the etiology is not well understood, IBD is characterized by a loss of the normal epithelium homeostasis that disrupts the intestinal barrier of these patients. Previous work by our group demonstrated that epithelial homeostasis along the colonic crypts involves a tight regulation of lipid profiles. To evaluate whether lipidomic profiles conveyed the functional alterations observed in the colonic epithelium of IBD, we performed matrix-assisted laser desorption ionization-mass spectrometry imaging (MALDI-MSI) analyses of endoscopic biopsies from inflamed and non-inflamed segments obtained from UC patients. Our results indicated that lipid profiling of epithelial cells discriminated between healthy and UC patients. We also demonstrated that epithelial cells of the inflamed mucosa were characterized by a decrease in mono- and di-unsaturated fatty acid-containing phospholipids and higher levels of arachidonic acid-containing species, suggesting an alteration of the lipid gradients occurring concomitantly to the epithelial differentiation. This result was reinforced by the immunofluorescence analysis of EPHB2 and HPGD, markers of epithelial cell differentiation, sustaining that altered lipid profiles were at least partially due to a faulty differentiation process. Overall, our results showed that lipid profiling by MALDI-MSI faithfully conveys molecular and functional alterations associated with the inflamed epithelium, providing the foundation for a novel molecular characterization of UC patients.

Exploring kidney allograft rejection: A proof-of-concept study using spatial transcriptomics.

In this proof-of-concept study, spatial transcriptomics combined with public single-cell ribonucleic acid-sequencing data were used to explore the potential of this technology to study kidney allograft rejection. We aimed to map gene expression patterns within diverse pathologic states by examining biopsies classified across nonrejection, T cell-mediated acute rejection, interstitial fibrosis, and tubular atrophy. Our results revealed distinct immune cell signatures, including those of T and B lymphocytes, monocytes, mast cells, and plasma cells, and their spatial organization within the renal interstitium. We also mapped chemokine receptors and ligands to study immune cell migration and recruitment. Finally, our analysis demonstrated differential spatial enrichment of transcription signatures associated with kidney allograft rejection across various biopsy regions. Interstitium regions displayed higher enrichment scores for rejection-associated gene expression patterns than tubular areas, which had negative scores. This implies that these signatures are primarily driven by processes unfolding in the renal interstitium. Overall, this study highlights the value of spatial transcriptomics for revealing cellular heterogeneity and immune signatures in renal transplant biopsies and demonstrates its potential for studying the molecular and cellular mechanisms associated with rejection. However, certain limitations must be borne in mind regarding the development and future applications of this technology.

SMORES: a simple microfluidic operating room for the examination and surgery of Stentor coeruleus.

Ciliates are powerful unicellular model organisms that have been used to elucidate fundamental biological processes. However, the high motility of ciliates presents a major challenge in studies using live-cell microscopy and microsurgery. While various immobilization methods have been developed, they are physiologically disruptive to the cell and incompatible with microscopy and/or microsurgery. Here, we describe a Simple Microfluidic Operating Room for the Examination and Surgery of Stentor coeruleus (SMORES). SMORES uses Quake valve-based microfluidics to trap, compress, and perform surgery on Stentor as our model ciliate. Compared with previous methods, immobilization by physical compression in SMORES is more effective and uniform. The mean velocity of compressed cells is 24 times less than that of uncompressed cells. The compression is minimally disruptive to the cell and is easily applied or removed using a 3D-printed pressure rig. We demonstrate cell immobilization for up to 2 h without sacrificing cell viability. SMORES is compatible with confocal microscopy and is capable of media exchange for pharmacokinetic studies. Finally, the modular design of SMORES allows laser ablation or mechanical dissection of a cell into many cell fragments at once. These capabilities are expected to enable biological studies previously impossible in ciliates and other motile species.

Inhibition of BRD4 Attenuates ER Stress-induced Renal Ischemic-Reperfusion Injury.

Renal ischemia-reperfusion injury (IRI) leads to endoplasmic reticulum (ER) stress, thereby initiating the unfolded protein response (UPR). When sustained, this response may trigger the inflammation and tubular cell death that acts to aggravate the damage. Here, we show that knockdown of the BET epigenetic reader BRD4 reduces the expression of ATF4 and XBP1 transcription factors under ER stress activation. BRD4 is recruited to the promoter of these highly acetylated genes, initiating gene transcription. Administration of the BET protein inhibitor, JQ1, one hour after renal damage induced by bilateral IRI, reveals reduced expression of ATF4 and XBP1 genes, low KIM-1 and NGAL levels and recovery of the serum creatinine and blood urea nitrogen levels. To determine the molecular pathways regulated by ATF4 and XBP1, we performed stable knockout of both transcription factors using CRISPR-Cas9 and RNA sequencing. The pathways triggered under ER stress were mainly XBP1-dependent, associated with an adaptive UPR, and partially regulated by JQ1. Meanwhile, treatment with JQ1 downmodulated most of the pathways regulated by ATF4 and related to the pathological processes during exacerbated UPR activation. Thus, BRD4 inhibition could be useful for curbing the maladaptive UPR activation mechanisms, thereby ameliorating the progression of renal disease.

BET inhibitor nanotherapy halts kidney damage and reduces chronic kidney disease progression after ischemia-reperfusion injury.

Targeting epigenetic mechanisms has emerged as a potential therapeutic approach for the treatment of kidney diseases. Specifically, inhibiting the bromodomain and extra-terminal (BET) domain proteins using the small molecule inhibitor JQ1 has shown promise in preclinical models of acute kidney injury (AKI) and chronic kidney disease (CKD). However, its clinical translation faces challenges due to issues with poor pharmacokinetics and side effects. Here, we developed engineered liposomes loaded with JQ1 with the aim of enhancing kidney drug delivery and reducing the required minimum effective dose by leveraging cargo protection. These liposomes efficiently encapsulated JQ1 in both the membrane and core, demonstrating superior therapeutic efficacy compared to freely delivered JQ1 in a mouse model of kidney ischemia-reperfusion injury. JQ1-loaded liposomes (JQ1-NPs) effectively targeted the kidneys and only one administration, one-hour after injury, was enough to decrease the immune cell (neutrophils and monocytes) infiltration to the kidney-an early and pivotal step to prevent damage progression. By inhibiting BRD4, JQ1-NPs suppress the transcription of pro-inflammatory genes, such as cytokines (il-6) and chemokines (ccl2, ccl5). This success not only improved early the kidney function, as evidenced by decreased serum levels of BUN and creatinine in JQ1-NPs-treated mice, along with reduced tissue expression of the damage marker, NGAL, but also halted the production of extracellular matrix proteins (Fsp-1, Fn-1, α-SMA and Col1a1) and the fibrosis development. In summary, this work presents a promising nanotherapeutic strategy for AKI treatment and its progression and provides new insights into renal drug delivery.

SMORES: A Simple Microfluidic Operating Room for the Examination and Surgery of Stentor coeruleus.

Ciliates are powerful unicellular model organisms that have been used to elucidate fundamental biological processes. However, the high motility of ciliates presents a major challenge in studies using live-cell microscopy and microsurgery. While various immobilization methods have been developed, they are physiologically disruptive to the cell and incompatible with microscopy and/or microsurgery. Here, we describe a Simple Microfluidic Operating Room for the Examination and Surgery of Stentor coeruleus (SMORES). SMORES uses Quake valve-based microfluidics to trap, compress, and perform surgery on Stentor as our model ciliate. Compared with previous methods, immobilization by physical compression in SMORES is more effective and uniform. The mean velocity of compressed cells is 24 times less than that of uncompressed cells. The compression is minimally disruptive to the cell and is easily applied or removed using a 3D-printed pressure rig. We demonstrate cell immobilization for up to 2 hours without sacrificing cell viability. SMORES is compatible with confocal microscopy and is capable of media exchange for pharmacokinetic studies. Finally, the modular design of SMORES allows laser ablation or mechanical dissection of a cell into many cell fragments at once. These capabilities are expected to enable biological studies previously impossible in ciliates and other motile species.

Plasmids of the incompatibility group FIBK occur in Klebsiella variicola from diverse ecological niches / Los plásmidos del grupo de incompatibilidad FIBK se encuentran en Klebsiella variicola en diversos nichos ecológicos

Plasmids play a fundamental role in the evolution of bacteria by allowing them to adapt to different environments and acquire, through horizontal transfer, genes that confer resistance to different classes of antibiotics. Using the available in vitro and in silico plasmid typing systems, we analyzed a set of isolates and public genomes of K. variicola to study its plasmid diversity. The resistome, the plasmid multilocus sequence typing (pMLST), and molecular epidemiology using the MLST system were also studied. A high frequency of IncF plasmids from human isolates but lower frequency from plant isolates were found in our strain collection. In silico detection revealed 297 incompatibility (Inc) groups, but the IncFIBK (216/297) predominated in plasmids from human and environmental samples, followed by IncFIIK (89/297) and IncFIA/FIA(HI1) (75/297). These Inc groups were associated with clinically important ESBL (CTX-M-15), carbapenemases (KPC-2 and NDM-1), and colistin-resistant genes which were associated with major sequence types (ST): ST60, ST20, and ST10. In silico MOB typing showed 76% (311/404) of the genomes contained one or more of the six relaxase families with MOBF being most abundant. We identified untypeable plasmids carrying blaKPC-2, blaIMP-1, and blaSHV-187 but for which a relaxase was found; this may suggest that novel plasmid structures could be emerging in this bacterial species. The plasmid content in K. variicola has limited diversity, predominantly composed of IncFIBK plasmids dispersed in different STs. Plasmid detection using the replicon and MOB typing scheme provide a broader context of the plasmids in K. variicola. This study showed that whole-sequence-based typing provides current insights of the prevalence of plasmid types and their association with antimicrobial resistant genes in K. variicola obtained from humans and environmental niches.(AU)

Properties and cellular uptake of photo-triggered mixed metallosurfactant vesicles intended for controlled CO delivery in gas therapy.

The scientific relevance of carbon monoxide has increased since it was discovered that it is a gasotransmitter involved in several biological processes. This fact stimulated research to find a secure and targeted delivery and lead to the synthesis of CO-releasing molecules. In this paper we present a vesicular CO delivery system triggered by light composed of a synthetized metallosurfactant (TCOL10) with two long carbon chains and a molybdenum-carbonyl complex. We studied the characteristics of mixed TCOL10/phosphatidylcholine metallosomes of different sizes. Vesicles from 80 to 800 nm in diameter are mainly unilamellar, do not disaggregate upon dilution, in the dark are physically and chemically stable at 4 °C for at least one month, and exhibit a lag phase of about 4 days before they show a spontaneous CO release at 37 °C. Internalization of metallosomes by cells was studied as function of the incubation time, and vesicle concentration and size. Results show that large vesicles are more efficiently internalized than the smaller ones in terms of the percentage of cells that show TCOL10 and the amount of drug that they take up. On balance, TCOL10 metallosomes constitute a promising and viable approach for efficient delivery of CO to biological systems.

Adaptive responses of yeast strains tolerant to acidic pH, acetate, and supraoptimal temperature.

Ethanol fermentations can be prematurely halted as Saccharomyces cerevisiae faces adverse conditions, such as acidic pH, presence of acetic acid, and supraoptimal temperatures. The knowledge on yeast responses to these conditions is essential to endowing a tolerant phenotype to another strain by targeted genetic manipulation. In this study, physiological and whole-genome analyses were conducted to obtain insights on molecular responses which potentially render yeast tolerant towards thermoacidic conditions. To this end, we used thermotolerant TTY23, acid tolerant AT22, and thermo-acid tolerant TAT12 strains previously generated by adaptive laboratory evolution (ALE) experiments. The results showed an increase in thermoacidic profiles in the tolerant strains. The whole-genome sequence revealed the importance of genes related to: H+, iron, and glycerol transport (i.e., PMA1, FRE1/2, JEN1, VMA2, VCX1, KHA1, AQY3, and ATO2); transcriptional regulation of stress responses to drugs, reactive oxygen species and heat-shock (i.e., HSF1, SKN7, BAS1, HFI1, and WAR1); and adjustments of fermentative growth and stress responses by glucose signaling pathways (i.e., ACS1, GPA1/2, RAS2, IRA2, and REG1). At 30 °C and pH 5.5, more than a thousand differentially expressed genes (DEGs) were identified in each strain. The integration of results revealed that evolved strains adjust their intracellular pH by H+ and acetic acid transport, modify their metabolism and stress responses via glucose signaling pathways, control of cellular ATP pools by regulating translation and de novo synthesis of nucleotides, and direct the synthesis, folding and rescue of proteins throughout the heat-shock stress response. Moreover, the motifs analysis in mutated transcription factors suggested a significant association of SFP1, YRR1, BAS1, HFI1, HSF1, and SKN7 TFs with DEGs found in thermoacidic tolerant yeast strains. KEY POINTS: • All the evolved strains overexpressed the plasma membrane H+ -ATPase PMA1 at optimal conditions • Tolerant strain TAT12 mutated genes encoding weak acid and heat response TFs HSF1, SKN7, and WAR1 • TFs HSF1 and SKN7 likely controlled the transcription of metabolic genes associated to heat and acid tolerance.

Plasmids of the incompatibility group FIBK occur in Klebsiella variicola from diverse ecological niches.

Plasmids play a fundamental role in the evolution of bacteria by allowing them to adapt to different environments and acquire, through horizontal transfer, genes that confer resistance to different classes of antibiotics. Using the available in vitro and in silico plasmid typing systems, we analyzed a set of isolates and public genomes of K. variicola to study its plasmid diversity. The resistome, the plasmid multilocus sequence typing (pMLST), and molecular epidemiology using the MLST system were also studied. A high frequency of IncF plasmids from human isolates but lower frequency from plant isolates were found in our strain collection. In silico detection revealed 297 incompatibility (Inc) groups, but the IncFIBK (216/297) predominated in plasmids from human and environmental samples, followed by IncFIIK (89/297) and IncFIA/FIA(HI1) (75/297). These Inc groups were associated with clinically important ESBL (CTX-M-15), carbapenemases (KPC-2 and NDM-1), and colistin-resistant genes which were associated with major sequence types (ST): ST60, ST20, and ST10. In silico MOB typing showed 76% (311/404) of the genomes contained one or more of the six relaxase families with MOBF being most abundant. We identified untypeable plasmids carrying blaKPC-2, blaIMP-1, and blaSHV-187 but for which a relaxase was found; this may suggest that novel plasmid structures could be emerging in this bacterial species. The plasmid content in K. variicola has limited diversity, predominantly composed of IncFIBK plasmids dispersed in different STs. Plasmid detection using the replicon and MOB typing scheme provide a broader context of the plasmids in K. variicola. This study showed that whole-sequence-based typing provides current insights of the prevalence of plasmid types and their association with antimicrobial resistant genes in K. variicola obtained from humans and environmental niches.

Structure-guided engineering of a receptor-agonist pair for inducible activation of the ABA adaptive response to drought.

Strategies to activate abscisic acid (ABA) receptors and boost ABA signaling by small molecules that act as ABA receptor agonists are promising biotechnological tools to enhance plant drought tolerance. Protein structures of crop ABA receptors might require modifications to improve recognition of chemical ligands, which in turn can be optimized by structural information. Through structure-based targeted design, we have combined chemical and genetic approaches to generate an ABA receptor agonist molecule (iSB09) and engineer a CsPYL1 ABA receptor, named CsPYL15m, which efficiently binds iSB09. This optimized receptor-agonist pair leads to activation of ABA signaling and marked drought tolerance. No constitutive activation of ABA signaling and hence growth penalty was observed in transformed Arabidopsis thaliana plants. Therefore, conditional and efficient activation of ABA signaling was achieved through a chemical-genetic orthogonal approach based on iterative cycles of ligand and receptor optimization driven by the structure of ternary receptor-ligand-phosphatase complexes.

Complications Following Total Ankle Arthroplasty Versus Ankle Arthrodesis for Primary Ankle Osteoarthritis.

INTRODUCTION: There are minimal data comparing complications between ankle arthrodesis (AA) versus total ankle arthroplasty (TAR) for operative management of primary osteoarthritis (OA). This study aimed to compare outcomes following AA versus TAR for primary ankle OA using a large patient database. METHODS: Patients who received AA or TAR for primary ankle OA from 2010 to 2019 were queried from PearlDiver. Rates of common joint complications were compared at 90 days, 1 year, and 2 years postoperatively using multivariable logistic regression. RESULTS: A total of 1136 (67%) patients received AA and 584 (33%) patients underwent TAR. Patients that received AA exhibited significantly higher rates of at least one common joint complication at 90 days (19.3% vs 12.6%; odds ratio [OR] 1.69), 1 year (25.6% vs 15.0%; OR 2.00), and 2 years (26.9% vs 16.2%; OR 1.91) postoperatively. This included higher rates of adjacent fusion or osteotomy procedures, periprosthetic fractures, and hardware removal at each postoperative follow-up (all P < .05). Rates of prosthetic joint infection were comparable at 2 years postoperatively (4.3% vs 4.2%; OR 0.91). CONCLUSION: The AA cohort exhibited higher rates of postoperative joint complications in the short and medium-term, namely, subsequent fusions or osteotomies, periprosthetic fractures, and hardware removal. LEVELS OF EVIDENCE: Level III.

Reoperation Rates Following Total Ankle Arthroplasty Versus Ankle Arthrodesis for Posttraumatic Indications.

AIMS: This studied aimed to compare rates of reoperation for patients who received primary ankle arthrodesis (AA) versus total ankle replacement (TAR) for posttraumatic indications between 2010 and 2016 Q2 using a nationwide claims database. METHODS: A retrospective cohort study analyzing patients who received primary AA or TAR for posttraumatic indications was performed using PearlDiver. Reoperations assessed included prosthetic joint infection (PJI), hardware removal, adjacent joint fusion, and local open reduction internal fixation (ORIF). Multivariable logistic regression was used to compare rates of reoperations at 1 and 2 years postdischarge. RESULTS: A total of 862 (74%) patients received AA and 318 (26%) patients underwent TAR for a posttraumatic indication. At 1 year, 305 (35.4%) AA patients had at least 1 reoperation compared with 55 (17.3%) TAR patients (OR 2.32; 95% CI, 1.68-3.26). At 2 years, 364 (42.2%) AA patients and 66 (20.8%) TAR patients had at least 1 reoperation (OR 2.51; 95% CI, 1.84-3.45). ORIF, hardware removal, and adjacent joint fusions were more likely for AA patients at both time intervals (all Ps < .05). CONCLUSION: Patients who received primary AA for posttraumatic indications exhibited higher rates of major reoperations in the short to medium term compared with patients who underwent TAR. LEVELS OF EVIDENCE: Level III: Retrospective cohort study.

Rates of Operative Management for Achilles Tendon Rupture Over the Last Decade and the Influence of Gender and Age.

BACKGROUND: With emerging evidence supporting functional rehabilitation for Achilles tendon ruptures (ATRs), this study sought to evaluate the treatment trends for patients sustaining an acute ATR and whether gender and age may influence the rates of operative repair. METHODS: A retrospective database review identified ATRs from 2010 through 2019. Patients were then stratified into three cohorts based on age (18-30, 30-45, and 46 and older), separated by gender, and then assessed whether patients were treated operatively or not. Cochran-Armitage Trend test was performed to analyze the trends of operative management. Chi-square analyses were performed to assess whether the proportion of patients who received operative management in each age cohort differed from 2010 to 2019. Logistic regression analyses were performed to assess whether gender influenced treatment. RESULTS: Over the previous decade, the total rates of operative treatment for ATR significantly decreased (18.3%-12.3%, P < .0001). Each individual age cohort experienced a proportional decrease in operative management when comparing 2010 with 2019 (all P < .0001). Within all age cohorts, males were significantly more likely to receive operative treatment for an ATR over the previous decade (odds ratios: 2.63-3.22). Conclusion. Overall rates of operative management for ATR decreased across all cohorts likely due to previous studies providing evidence of similar results between operative and nonoperative managements. Over the previous decade, males were demonstrated to be far more likely than females to undergo operative management. Why females are less likely to receive an operation for ATR is likely multi-factorial and requires further exploration. LEVEL OF EVIDENCE: Level III: Retrospective comparative study.

Conducta suicida en jóvenes y adultos en la provincia Mayabeque (2018 y 2019)

Introducción: La conducta suicida incluye el intento suicida y el suicidio consumado. En Cuba ocupa la décima causa de muerte en el cuadro de mortalidad y la tercera en los adolescentes. Objetivo: Caracterizar la conducta suicida en jóvenes y adultos en la provincia Mayabeque en 2018 y 2019. Métodos: Estudio descriptivo y transversal. El universo quedó conformado por todos los casos de morbilidad por intento suicida registrados en las tarjetas de enfermedad de declaración obligatoria y los casos de mortalidad por suicidio registrados en la base de datos de la Dirección Provincial de Salud de Mayabeque entre 2018 y 2019. Entre las variables se consideraron: edad, sexo, métodos y municipios de residencia. Se calcularon las tasas de mortalidad bruta y específica calculadas por 100 000 habitantes por sexo y la razón hombre/mujer. Las variables estudiadas se expresaron en porcentajes. Resultados: Se notificaron 711 intentos suicidas. El sexo femenino exteriorizó 475 (66,8 %) casos. La razón de intento/suicidio de forma general fue de 6,8 en 2018 y de 7,7 en 2019. Se registraron 101 suicidios. El sexo masculino presentó 81 (80,2 %) casos. El método más empleado para el suicidio fue el ahorcamiento en 72 (71,2 %) casos. Conclusiones: El sexo femenino resultó el más afectado en el intento y el masculino en el suicidio. Se necesita identificar los factores de riesgo de la conducta suicida para su prevención.

Introduction: Suicidal behavior includes the suicide attempt and completed suicide. In Cuba it ranks tenth among the leading causes of death and third among adolescents according to the mortality record. Objective: To characterize the suicidal behavior in young people and adults from Mayabeque province in 2018 and 2019. Methods: A descriptive and cross-sectional study. The universe of study comprised all the morbidity cases for suicide attempt registered in the notifiable disease cards and the mortality cases for completed suicide registered in Provincial Health Department database in Mayabeque in 2018 and 2019. Among the variables studied were age, sex, suicide methods, and municipality of residence. Crude and cause-specific mortality rates were calculated per 100 000 population by sex and woman/man ratio. Variables were expressed as percentage. Results: A total of 711 suicide attempts were reported. Female sex accounted for 475 (66.8%) cases. Overall, the suicide attempt/completed suicide ratio was of 6.8 in 2018 and 7.7 in 2019. A total of 101 completed suicides were reported. There were 81 cases (80.2%) among male sex. Hanging was the most common suicide method in 72 cases (71.2 %). Conclusions: Suicide attempts are more frequent among women while completed suicide is more frequent among men. It is necessary to identify the risk factors associated to suicidal behavior for their prevention.

Insights behind the Relationship between Colorectal Cancer and Obesity: Is Visceral Adipose Tissue the Missing Link?

Colorectal cancer (CRC) is a major health problem worldwide, with an estimated 1.9 million new cases and 915,880 deaths in 2020 alone. The etiology of CRC is complex and involves both genetic and lifestyle factors. Obesity is a major risk factor for CRC, and the mechanisms underlying this link are still unclear. However, the generalized inflammatory state of adipose tissue in obesity is thought to play a role in the association between CRC risk and development. Visceral adipose tissue (VAT) is a major source of proinflammatory cytokines and other factors that contribute to the characteristic systemic low-grade inflammation associated with obesity. VAT is also closely associated with the tumor microenvironment (TME), and recent evidence suggests that adipocytes within the TME undergo phenotypic changes that contribute to tumor progression. In this review, we aim to summarize the current evidence linking obesity and CRC, with a focus on the role of VAT in tumor etiology and progression.

Reactivity of a Recombinant Esterase from Thermus thermophilus HB27 in Aqueous and Organic Media.

The thermoalkalophilic membrane-associated esterase E34Tt from Thermus thermophilus HB27 was cloned and expressed in Kluyveromyces lactis (KLEST-3S esterase). The recombinant enzyme was tested as a biocatalyst in aqueous and organic media. It displayed a high thermal stability and was active in the presence of 10% (v/v) organic solvents and 1% (w/v) detergents. KLEST-3S hydrolysed triglycerides of various acyl chains, which is a rare characteristic among carboxylic ester hydrolases from extreme thermophiles, with maximum activity on tributyrin. It also displayed interfacial activation towards triacetin. KLEST-3S was also tested as a biocatalyst in organic media. The esterase provided high yields for the acetylation of alcohols. In addition, KLEST-3S catalyzed the stereoselective hydrolysis of (R,S)-ibuprofen methyl ester (87% ee). Our results indicate that KLEST-3S may be a robust and efficient biocatalyst for application in industrial bioconversions.

Dependencia endotelial del efecto de canfenol plus 3 % sobre el músculo liso vascular arterial / Endothelial dependence of the effect of 3 % camphenol plus on arterial vascular smooth muscl

RESUMEN Introducción: el canfenol plus, es un derivado clorado del fenol empleado de forma habitual como medicación intraconducto durante los tratamientos pulporradiculares en Estomatología. Son escasos los estudios en relación con sus efectos sobre el músculo liso vascular arterial y la participación del endotelio en estos. Objetivo: determinar la dependencia endotelial del efecto de canfenol plus 3 % sobre el músculo liso vascular arterial. Material y Métodos: se realizó una investigación experimental preclínica utilizando 26 anillos de carótida externa desprovistos de endotelio vascular. Las preparaciones realizadas se colocaron en baño de órganos, registrándose la tensión desarrollada por el músculo liso vascular tras la adición de acetilcolina, así como de soluciones de canfenol plus 3 % durante diferentes intervalos de tiempo. La dependencia entre ambas tensiones, se determinó a través de un modelo de regresión lineal simple. Resultados: tras la preactivación con solución Krebs concentrada de iones potasio, la adición de 10 μl de acetilcolina y canfenol plus 3 %, indujeron una discreta, pero significativa vasorrelajación de la musculatura lisa vascular. El modelo de regresión lineal elaborado, demostró la dependencia entre las variables tensión producida por acetilcolina y tensión producida por el fármaco al décimo minuto, corroborando la implicación del endotelio vascular en dicho efecto relajante. Conclusiones: el canfenol plus 3 %, produjo in vitro, un efecto vasorrelajante sobre la musculatura lisa de anillos de carótida externa, dependiente de endotelio y a partir de un factor relajante o hiperpolarizante derivado de este.

ABSTRACT Introduction: Camphenol plus is a chlorinated phenol derivative commonly used as intracanal medication during pulporradicular treatments in Dentistry. Studies in relation to its effects on arterial vascular smooth muscle and the involvement of the endothelium in them are scarce. Objective: To determine the endothelial dependence of the effect of 3 % camphenol plus on arterial vascular smooth muscle. Material and Methods: A preclinical experimental research was carried out using 26 external carotid artery rings devoid of vascular endothelium. The preparations made were placed in an organ bath, recording the tension developed by the vascular smooth muscle after the addition of acetylcholine, as well as 3 % Camphenol plus solutions during different intervals of time. The dependence between both tensions was determined through a simple linear regression model. Results: After pre-activation with Krebs concentrated potassium ion solution, the addition of 10 μl of acetylcholine and 3 % camphenol plus induced a discrete but significant vasorelaxation of the vascular smooth muscle. The linear regression model developed demonstrated the dependence between the variables tension produced by acetylcholine and tension produced by the drug at the tenth minute, corroborating the involvement of the vascular endothelium in that vasorelaxant effect. Conclusions: It is concluded that 3 % Camphenol plus in vitro, produced a vasorelaxant effect on the smooth muscle of external carotid rings dependent on endothelium and from a relaxing or hiperpolarizing factor derived from it.

Discovery of V-0219: A Small-Molecule Positive Allosteric Modulator of the Glucagon-Like Peptide-1 Receptor toward Oral Treatment for "Diabesity".

Peptidic agonists of the glucagon-like peptide-1 receptor (GLP-1R) have gained a prominent role in the therapy of type-2 diabetes and are being considered for reducing food intake in obesity. Potential advantages of small molecules acting as positive allosteric modulators (PAMs) of GLP-1R, including oral administration and reduced unwanted effects, could improve the utility of this class of drugs. Here, we describe the discovery of compound 9 (4-{[1-({3-[4-(trifluoromethyl)phenyl]-1,2,4-oxadiazol-5-yl}methyl)piperidin-3-yl]methyl}morpholine, V-0219) that exhibits enhanced efficacy of GLP-1R stimulation, subnanomolar potency in the potentiation of insulin secretion, and no significant off-target activities. The identified GLP-1R PAM shows a remarkable in vivo activity, reducing food intake and improving glucose handling in normal and diabetic rodents. Enantioselective synthesis revealed oral efficacy for (S)-9 in animal models. Compound 9 behavior bolsters the interest of a small-molecule PAM of GLP-1R as a promising therapeutic approach for the increasingly prevalent obesity-associated diabetes.

Epigenetic networks driving T cell identity and plasticity during immunosenescence.

The aging process is associated with the accumulation of epigenetic alterations in immune cells, although the origin of these changes is not clear. Understanding this epigenetic drift in the immune system can provide essential information about the progression of the aging process and the immune history of each individual.