plantMASST - Community-driven chemotaxonomic digitization of plants.

Understanding the distribution of hundreds of thousands of plant metabolites across the plant kingdom presents a challenge. To address this, we curated publicly available LC-MS/MS data from 19,075 plant extracts and developed the plantMASST reference database encompassing 246 botanical families, 1,469 genera, and 2,793 species. This taxonomically focused database facilitates the exploration of plant-derived molecules using tandem mass spectrometry (MS/MS) spectra. This tool will aid in drug discovery, biosynthesis, (chemo)taxonomy, and the evolutionary ecology of herbivore interactions.

Long-term ayahuasca use is associated with preserved global cognitive function and improved memory: a cross-sectional study with ritual users.

Although several studies have been conducted to elucidate the relationship between psychedelic consumption and cognition, few have focused on understanding the long-term use influence of these substances on these variables, especially in ritualistic contexts.  To verify the influence of ritualistic ayahuasca consumption on the cognition of experienced ayahuasca religious users (> 20 years) and beginners (< 3 years), which participated in rituals of the Centro Luz Divina (CLD), a Santo Daime church in Brazil. Observational, descriptive, and cross-sectional study was carried out in which 48 people participated divided into three groups: (a) experienced ayahuasca users (n = 16), (b) beginner ayahuasca users (n = 16) and (c) control group (n = 16). All groups were matched by sex, age, and education and contained 8 women and 8 men. Cognition was assessed with the WASI (intelligence quotient), Digit Span (verbal working memory), Corsi Block-Tapping Task (visuospatial-related and working memory), Rey-Osterrieth Complex Figure test (visual perception, immediate memory), and Wisconsin Card Sorting and Five Digit Test (executive functions). Groups were homogenous in terms of sociodemographic characteristics, with participants presenting average intellectual performance. There was no evidence of cognitive decline amongst ayahuasca users. The experienced group showed higher scores compared to the less experienced group in the Digit Span and Corsi Block-Tapping tasks, which assess working verbal and visuospatial memories respectively. We confirmed the botanical identities of Psychotria viridis and Banisteriopsis caapi and the presence of the alkaloids both in the plants and in the brew. Short and long-term ayahuasca consumption does not seem to alter human cognition, while long-term use seems to be associated with improvements in aspects of working memory when compared with short-term use.

Evaluation of ALA-capped silver, copper, and silver-copper nanoparticles for controlling fungal plant pathogens.

Phytopathogenic fungi significantly threaten global food security, causing substantial yield and quality losses. Sustainable solutions are urgently needed to combat these agricultural pathogens. This study explored the potential of silver (Ag), copper (Cu), and combined Ag/Cu nanoparticles capped with aminolevulinic acid (ALA) as antifungal agents. The nanoparticles (ALAAg, ALACu, and ALAAgCu) were synthesized via photoreduction and characterized using various techniques (UV-Vis, TEM, XRD, Zeta potential). Their antifungal activity against four key plant pathogens (Alternaria grandis, Colletotrichum truncatum, Corynespora cassiicola, and Fusarium oxysporum) was evaluated using poisoned food techniques. Notably, ALAAgCuNPs demonstrated superior antifungal activity compared to a conventional fungicide against two fungal strains. Even at lower concentrations, ALAAgCuNPs exhibited fungistatic effects comparable to those of the control. These promising results suggest the potential of ALAAgCu NPs as a broad-spectrum, potentially eco-friendly alternative for fungal control in plants and seeds. This approach is crucial for ensuring crop health, harvest quality, and food safety.

Pleonotoquinones, Cytotoxic Oxepinenaphthoquinones from Pleonotoma jasminifolia.

Two unusual naphthoquinones, named here as pleonotoquinones A (1) and B (2), were isolated along with two known anthraquinones (3 and 4) via chromatographic separations of an ethyl acetate extract of the roots of Pleonotoma jasminifolia. Compounds 1 and 2 are the first examples of quinones bearing a 2-methyloxepine moiety. The compounds were isolated with the aid of mass spectrometry and molecular networking, and their structures were resolved using 1D and 2D NMR and HRESIMS data. The isolated compounds were evaluated for their antiproliferative activity against human cancer cell lines, and compounds 1 and 2 displayed cytotoxicity against human colon cancer HCT116 cells (IC50 = 2.6 µM for compound 1 and IC50 = 4.3 µM for compound 2) and human liver cancer HepG2 cells (IC50 = 1.9 µM for compound 1 and IC50 = 6.4 µM for compound 2).

Unveiling new myrsinoic acids and AChE ligands from Myrsine guianensis (Aubl.) Kuntze.

Molecular dereplication and drug-like discovery are important tools for exploring the chemical profile of metabolites in a complex mixture. In order to establish a workflow for discovering novel acetylcholinesterase (AChE) ligands, we performed the chemical study of Myrsine guianensis (Aubl.) Kuntze (Primulaceae). To carry out the bioprospection, nine extracts were obtained from different parts of the plant. Through the dereplication approaches, seventeen metabolites were annotated. In order to confirm the putative inferences, a HPLC preparative method was developed to isolate three known myrsinoic acids, A(1), B(2) and C(3). Along with, we are reporting the obtention of two new congeners, G(5) and H(6), which their structures were elucidated by NMR and HRMS data. Besides that, two extracts were submitted to affinity assays to accelerate the discovery of AChE ligands. Desorbates were analyzed through LC-HRMS for calculating the affinity ratio (AR). Thus, (1) presented AR = 4.59, therefore was considered a potential ligand.

Discovering New Natural Products Using Metabolomics-Based Approaches.

The incessant search for new natural molecules with biological activities has forced researchers in the field of chemistry of natural products to seek different approaches for their prospection studies. In particular, researchers around the world are turning to approaches in metabolomics to avoid high rates of re-isolation of certain compounds, something recurrent in this branch of science. Thanks to the development of new technologies in the analytical instrumentation of spectroscopic and spectrometric techniques, as well as the advance in the computational processing modes of the results, metabolomics has been gaining more and more space in studies that involve the prospection of natural products. Thus, this chapter summarizes the precepts and good practices in the metabolomics of microbial natural products using mass spectrometry and nuclear magnetic resonance spectroscopy, and also summarizes several examples where this approach has been applied in the discovery of bioactive molecules.

Antimicrobial Activity and Molecular Docking Studies of the Biotransformation of Diterpene Acanthoic Acid Using the Fungus Xylaria sp.

Biotransformations are reactions mediated by microorganisms, such as fungi. These bioreactions have high chemo- and stereoselectivity on organic substrates and can be applied in the search for new bioactive compounds. In this study, acanthoic acid (AA) was biotransformed using the fungus Xylaria sp., giving the novel compound 3ß,7ß-dihydroxyacanthoic acid (S1). Both the AA and the product S1 were tested against Gram-positive and Gram-negative bacteria. To identify and validate possible biological targets as enzymes or proteins involved in the activity observed in vitro, we used the molecular docking method. Hydroxylation at the C-3 and C-7 positions of the biotransformation product enhanced its activity against Escherichia coli as well as its binding affinity and interactions with superoxide dismutase 1 (SOD1; PDB ID 4A7G). Based on our results, the SOD1 enzyme was suggested to be a possible target for the antioxidant activity of product S1.

Discovery of dual PKS involved in sclerotiorin biosynthesis in Penicillium meliponae using genome mining and gene knockout.

Fungi of the genus Penicillium section Sclerotiora have as their main characteristic the presence of orange-pigmented mycelium, which is associated with sclerotiorin, a chlorinated secondary metabolite of the azaphilone subclass of polyketides. Sclerotiorin presents anti-diabetes, antioxidant, anti-inflammatory, anti-Alzheimer, antiviral, and antimicrobial activities, which has always attracted the attention of researchers worldwide. During our ongoing search for azaphilone-producing Amazonian fungi, the strain of Penicillium MMSRG-058 was isolated as an endophyte from the roots of Duguetia stelechantha and showed great capacity for producing sclerotiorin-like metabolites. Using multilocus phylogeny, this strain was identified as Penicillium meliponae. Moreover, based on the genome mining of this strain through the reverse approach, a cluster of putative biosynthetic genes (BGC) responsible for the biosynthesis of sclerotiorin-like metabolites (scl cluster) was identified. The knockout of the sclA (highly reducing PKS) and sclI (non-reducing PKS) genes resulted in mutants with loss of mycelial pigmentation and terminated the biosynthesis of sclerotiorin-like metabolites: geumsanol B, chlorogeumsanol B, 7-deacetylisochromophilone VI, isochromophilone VI, ochrephilone, isorotiorin, and sclerotiorin. Based on these results, a biosynthetic pathway was proposed considering the homology of BGC scl genes with the azaphilone BGCs that have already been functionally characterized.

Power of mortality prediction in patients awaiting liver transplantation according to the Global Leadership Initiative on Malnutrition criteria and Subjective Global Assessment and Royal Free Hospital Global Assessment scores.

OBJECTIVES: This study aimed to analyze the performance of the Global Leadership Initiative on Malnutrition (GLIM) criteria and Subjective Global Assessment (SGA) and Royal Free Hospital Global Assessment (RFH-GA) scores in predicting 12-mo mortality in patients awaiting liver transplantation. METHODS: This is a longitudinal observational study, carried out between March 2019 and November 2021. Clinical data were collected and nutritional assessment was performed through anthropometry and application of validated instruments, such as the SGA, GLIM criteria, and RFH-GA. A Cox regression model was carried out, in which the dependent variable was mortality in 1 y, and the independent variables were the classifications of nutritional status by the different methods. RESULTS: The sample consisted of 126 patients, most of them male (56.35%). Malnutrition was diagnosed in 85.71% of the patients according to the RFH-GA, 62.70% according to the SGA, and 56.31% according to the GLIM criteria. Malnutrition assessed by GLIM was related to a 3.79-fold increase in the chance of mortality over time in patients awaiting liver transplantation. Moreover, the GLIM criteria had good discriminatory power in identifying mortality in patients awaiting liver transplantation, compared with the initial and final SGA and RFH-GA scores and the Model for End-stage Liver Disease-Sodium (MELD-Na) index. CONCLUSIONS: The GLIM criteria were a good predictor of increased risk of mortality in malnourished patients with chronic liver disease awaiting liver transplantation, compared with the SGA and RFH-GA scores and the MELD-Na index.

Molecular Dereplication and In Vitro and In Silico Pharmacological Evaluation of Coriandrum sativum against Neuroblastoma Cells.

The aim of this study was to investigate the cytotoxic activity of the Coriandrum sativum (C. sativum) ethanolic extract (CSEE) in neuroblastoma cells, chemically characterize the compounds present in the CSEE, and predict the molecular interactions and properties of ADME. Thus, after obtaining the CSEE and performing its chemical characterization through dereplication methods using UPLC/DAD-ESI/HRMS/MS, PM6 methods and the SwissADME drug design platform were used in order to predict molecular interactions and ADME properties. The CSEE was tested for 24 h in neuroblastoma cells to the establishment of the IC50 dose. Then, the cell death was evaluated, using annexin-PI, as well as the activity of the effector caspase 3, and the protein and mRNA levels of Bax and Bcl-2 were analyzed by ELISA and RT-PCR, respectively. By UHPLC/DAD/HRMS-MS/MS analysis, the CSEE showed a high content of isocoumarins-dihydrocoriandrin, coriandrin, and coriandrones A and B, as well as nitrogenated compounds (adenine, adenosine, and tryptophan). Flavonoids (apigenin, hyperoside, and rutin), phospholipids (PAF C-16 and LysoPC (16:0)), and acylglicerol were also identified in lower amount as important compounds with antioxidant activity. The in silico approach results showed that the compounds 1 to 6, which are found mostly in the C. sativum extract, obey the "Five Rules" of Lipinski, suggesting a good pharmacokinetic activity of these compounds when administered orally. The IC50 dose of CSEE (20 µg/mL) inhibited cell proliferation and promoted cell death by the accumulation of cleaved caspase-3 and the externalization of phosphatidylserine. Furthermore, CSEE decreased Bcl-2 and increased Bax, both protein and mRNA levels, suggesting an apoptotic mechanism. CSEE presents cytotoxic effects, promoting cell death. In addition to the promising results predicted through the in silico approach for all compounds, the compound 6 showed the best results in relation to stability due to its GAP value.

Lipopolysaccharide Induces Gliotoxicity in Hippocampal Astrocytes from Aged Rats: Insights About the Glioprotective Roles of Resveratrol.

Astrocytes may undergo a functional remodeling with aging, acquiring a pro-inflammatory state. In line with this, resveratrol represents an interesting strategy for a healthier brain aging since it can improve glial functions. In the present study, we investigated the glioprotective role of resveratrol against lipopolysaccharide (LPS)-induced gliotoxicity in hippocampal aged astrocytes. Astrocyte cultures were obtained from aged rats (365 days old) and challenged in vitro with LPS in the presence of resveratrol. Cultured astrocytes from newborn rats were used as an age comparative for evaluating LPS gliotoxicity. In addition, aged rats were submitted to an acute systemic inflammation with LPS. Hippocampal astrocyte cultures were also obtained from these LPS-stimulated aged animals to further investigate the glioprotective effects of resveratrol in vitro. Overall, our results show that LPS induced a higher inflammatory response in aged astrocytes, compared to newborn astrocytes. Several inflammatory and gene expression alterations promoted by LPS in aged astrocyte cultures were similar in hippocampal tissue from aged animals submitted to in vivo LPS injection, corroborating our in vitro findings. Resveratrol, in turn, presented anti-inflammatory effects in aged astrocyte cultures, which were associated with downregulation of p21 and pro-inflammatory cytokines, Toll-like receptors (TLRs), and nuclear factor κB (NFκB). Resveratrol also improved astroglial functions. Upregulation of sirtuin 1 (SIRT1), nuclear factor erythroid 2-related factor 2 (Nrf2), and heme oxygenase 1 (HO-1) represent potential molecular mechanisms associated with resveratrol-mediated glioprotection. In summary, our data show that resveratrol can prime aged astrocytes against gliotoxic stimuli, contributing to a healthier brain aging.

Chemodiversity and Anti-Leukemia Effect of Metabolites from Penicillium setosum CMLD 18.

Penicillium setosum represents a Penicillium species recently described, with little up-to-date information about its metabolic and biological potential. Due to this scenario, we performed chemical and biological studies of P. setosum CMLD18, a strain isolated from Swinglea glutinosa (Rutaceae). HRMS-MS guided dereplication strategies and anti-leukemia assays conducted the isolation and characterization of six compounds after several chromatographic procedures: 2-chloroemodic acid (2), 2-chloro-1,3,8-trihydroxy-6- (hydroxymethyl)-anthraquinone (7), 7-chloroemodin (8), bisdethiobis(methylthio)acetylaranotine (9), fellutanine C (10), and 4-methyl-5,6-diihydro-2H-pyran-2-one (15). From the assayed metabolites, (10) induced cellular death against Kasumi-1, a human leukemia cell line, as well as good selectivity for it, displaying promising cytotoxic activity. Here, the correct NMR signal assignments for (9) are also described. Therefore, this work highlights more detailed knowledge about the P. setosum chemical profile as well as its biological potential, offering prospects for obtaining natural products with anti-leukemia capabilities.

Gliotoxicity and Glioprotection: the Dual Role of Glial Cells.

Glial cells (astrocytes, oligodendrocytes and microglia) are critical for the central nervous system (CNS) in both physiological and pathological conditions. With this in mind, several studies have indicated that glial cells play key roles in the development and progression of CNS diseases. In this sense, gliotoxicity can be referred as the cellular, molecular, and neurochemical changes that can mediate toxic effects or ultimately lead to impairment of the ability of glial cells to protect neurons and/or other glial cells. On the other hand, glioprotection is associated with specific responses of glial cells, by which they can protect themselves as well as neurons, resulting in an overall improvement of the CNS functioning. In addition, gliotoxic events, including metabolic stresses, inflammation, excitotoxicity, and oxidative stress, as well as their related mechanisms, are strongly associated with the pathogenesis of neurological, psychiatric and infectious diseases. However, glioprotective molecules can prevent or improve these glial dysfunctions, representing glial cells-targeting therapies. Therefore, this review will provide a brief summary of types and functions of glial cells and point out cellular and molecular mechanisms associated with gliotoxicity and glioprotection, potential glioprotective molecules and their mechanisms, as well as gliotherapy. In summary, we expect to address the relevance of gliotoxicity and glioprotection in the CNS homeostasis and diseases.

Influence of Dentin Priming with Tannin-Rich Plant Extracts on the Longevity of Bonded Composite Restorations.

OBJECTIVE: This in vitro study evaluated the influence of bioactive plant extracts as dentin biomodifying agents to improve the longevity of bonded restorations. For that, plant extracts were applied to the dentin surface prior to the adhesive system. MATERIALS AND METHODS: Bovine incisors were ground flat to obtain 2 mm thick slices in which conical preparations were made (N = 10). Tannin-containing plant extracts were applied to dentin before the application of the restorative system, as follows: control group (untreated, CTL), chlorhexidine 0.12% (CHX), mastruz (Dysphania ambrosioides, MTZ), cat's claw (Uncaria tomentosa, CTC), guarana (Paullinia cupana, GUA), galla chinensis (Rhus chinensis, GCH), and tannic acid (extracted from Acacia decurrens, TNA). The push-out bond strength test was conducted (0.5 mm/min). Dentin biomodification was assessed by the modulus of elasticity and mass change in bovine tooth sections (0.5 × 1.7 × 7.0 mm). The dentin staining after extract treatments of dentin slices was compared. The dentin surface wettability was also evaluated by means of the contact angles of the adhesive system with the dentin surface and compared with the untreated control group. Data were subjected to ANOVA/Tukey's test (α = 0.05). RESULTS: The bond strength of the restoratives to dentin was not significantly improved by the plant extracts, irrespective of the evaluation time (p > 0.05). Except for TNA, the elastic modulus of demineralized dentin significantly reduced after treatment with the plant extracts (p < 0.05). The dentin staining correlated with the tannin content of the extracts. The contact angle was significantly reduced when treated with CTC, GCH, and TNA. CONCLUSIONS: The tannin-containing extracts had a questionable effect on the longevity of bonded restorations. The dentin modulus was negatively affected by the extract treatments. Although some of the extracts changed the contact angle, which seems to improve the adhesive monomer permeation, the tannin-rich plant extract application prior to adhesive application was proven to be clinically unfeasible due to dentin staining.

Use of neck circumference as a predictor of cardiovascular risk in chronic kidney patients undergoing haemodialysis who are candidates for transplantation.

INTRODUCTION: Patients undergoing haemodialysis are at great cardiovascular risk. Neck circumference (NC) is a simple and low-cost measure for estimating this risk precociously. The present study aimed to evaluate whether the cardiovascular risk obtained by NC is associated with the main cardiometabolic risk factors in patients on haemodialysis treatment who are on a waiting list for transplantation. METHODS: A cross-sectional study was conducted including 96 patients in a single transplantation centre. Socio-demographic, clinical-laboratory and anthropometric data were collected. NC was considered as a dependent variable and the independent variables were body mass index (BMI), fasting glycaemia and lipid profile, triglyceride and high-density lipoprotein-cholesterol (TGL/HDL-C) ratio, and triglyceride and glycaemia (TyG) index. For the comparison of averages, we used Mann-Whitney and Student's t tests, as well as one-way analysis of variance and Kruskal-Wallis tests. Bivariate and multivariate logistic regression was performed for the association between NC and cardiometabolic risk factors. p < 0.05 was considered statistically significant. RESULTS: There were higher BMI averages, blood glucose, triglycerides (TGL), TGL/HDL-C ratio and TyG index in the tertile 3 of the NC, whereas the HDL-C decreased as the tertile increased. There was a statistically significant risk of cardiovascular disease that was asscoiated, according to NC, with being overweight, high levels of TGL, TGL/HDL-C, TyG index and low HDL-C. CONCLUSIONS: NC is shown to be associated with cardiometabolic risk factors in kidney patients undergoing haemodialysis who are on a transplant waiting list.

Penicillium genus as a source for anti-leukemia compounds: an overview from 1984 to 2020.

Penicillium is a widely explored genus due to its chemical diversity and associated biological properties; in addition, it represents an important source for cytotoxic compounds with good application perspectives. Based on these aspects, in this review, Penicillium compounds that presented activity against human leukemia cell lines are being listed and discussed. For this, a careful bibliographic survey was carried out in the main electronic databases, i.e. Scopus, SciFinder, Web of Science and Pubmed. Between 1984 and 2020, thirty seven original papers were selected, when using the search terms Penicillium and leukemia. The occurrence of l-asparaginase produced by some Penicillium spp. was also highlighted since this enzyme is being employed for acute lymphoblastic leukemia and lymphosarcoma therapies. Therefore, this overview aims to demonstrate the potential of metabolites biosynthesized by Penicillium fungi which can be applied in human leukemia therapies and opportunities for designing new lead compounds.

Identification of flavonoid-3-O-glycosides from leaves of Casearia arborea (Salicaceae) by UHPLC-DAD-ESI-HRMS/MS combined with molecular networking and NMR.

INTRODUCTION: Casearia is an essential source of cytotoxic highly oxidised clerodane diterpenes, in addition to phenolics, flavonoids, and glycoside derivatives. Here we identify flavonoid-3-O-glycoside derivatives in the ethyl acetate (EtOAc) fraction of the methanolic extract from leaves C. arborea leaves. OBJECTIVE: To characterise the EtOAc phase from the methanolic extract of C. arborea leaves using ultra-high-performance liquid chromatography diode array detector high-resolution tandem mass spectrometry (UHPLC-DAD-HRMS/MS) and molecular networking-based dereplication. Methodology We identified compounds not annotated in the GNPS platform by co-injection of standards in HPLC-DAD or by isolation and characterisation of the metabolites using nuclear magnetic resonance (NMR) spectroscopy. A workflow on the GNPS platform aided the organisation of spectral data and dereplication by annotations. We subjected the EtOAc phase to HPLC-DAD analysis using standard compound co-injection to corroborate the GNPS annotations. We isolated unidentified compounds with semi-preparative HPLC-DAD for structural identification using NMR. RESULTS: We annotated a molecular family of flavonoid-3-O-glycosides in the molecular networking created using the GNPS platform. These included avicularin, cacticin, isoquercitrin, quercitrin, rutin, and a quercetin-3-O-pentoside cluster. We confirmed the annotations with standard compounds using HPLC-DAD co-injection analysis, besides identifying quercetin-3-O-robinobioside and kaempferol. We isolated three flavonoid-3-O-pentosides and characterised them using one- and two-dimensional NMR; we identified them as reynoutrin, guaijaverin, and avicularin. CONCLUSION: This work describes the isolation of kaempferol and nine known flavonoid-3-O-glycosides from the polar fraction of the methanolic extract (EtOAc) from C. arborea leaves using molecular networking to guide the chromatographic procedures. We identified eight compounds for the first time in Casearia that amplify and reinforce the genus' chemotaxonomy with the presence of glycosylated flavonoids.

Karmitoxin production by Karlodinium armiger and the effects of K. armiger and karmitoxin towards fish.

The dinoflagellate Karlodinium armiger has a huge impact on wild and caged fish during blooms in coastal waters. Recently, a new toxin, karmitoxin, was chemically characterized from K. armiger and a quantification method was established, thereby allowing investigations of the fish killing mechanism. K. armiger is not able to grow in standard growth media that are based on nitrate as a nitrogen source, and successful cultures of this species have only been achieved in mixotrophic cultures after addition of a prey source. Here we show that addition of ammonium (up to 50 µM) to the growth media is a good alternative, as K. armiger batch cultures achieve growth rates, which are comparable to growth rates reached in mixotrophic cultures. Karmitoxin production (1.9 and 2.9 pg cell-1 d-1) and cellular karmitoxin content (8.72 ± 0.25 pg cell-1 and 7.14 ± 0.29 pg cell-1) were in the same range, though significantly different, in prey-fed cultures and monocultures supplied with ammonium, respectively. Net production of karmitoxin stopped when the K. armiger cultures reached stationary growth phase, indicating no accumulation of karmitoxin in cells or growth media. Toxicity tests towards sheepshead minnow fish larvae indicated rapid death of the fish larvae when exposed to high K. armiger cell concentrations (LT50 of 2.06 h at 44.9 × 103 cells mL-1 cultivated with ammonium). Purified toxins caused the same physical damage to fish larvae as living K. armiger cultures. An exposure of purified karmitoxin to fish larvae and rainbow trout gill cells indicated that the fish larvae were about three times less sensitive than gill cells. When comparing the effect of purified toxins with the effect of whole K. armiger cultures, twice the toxin concentration of the purified toxins was needed to cause the same effect. Although a loss of karmitoxin of twenty percent was observed during the incubation, this could not explain the apparent discrepancy. Other factors, like a direct effect of the K. armiger cells on the fish larvae or other, yet unknown toxins may influence the effect of whole cell cultures. To study the effects of released karmitoxin, fish larvae were exposed to a K. armiger culture that was treated with HP-20 resin, which adsorbs extracellular karmitoxin. The 24 h HP-20 treatment resulted in a K. armiger culture that had 37% less total karmitoxin, without a reduction in cell concentration, and a reduced toxic effect was observed in the HP-20 treated culture, as compared to non-treated controls. Fish larvae that were exposed to HP-20 treated culture were immobilized, but survived during the 12 h exposure, whereas the exposure to non-treated culture led to high mortality of the fish larvae. Direct observations under the microscope revealed no evidence of micropredation of K. armiger on the fish larvae during any of the exposures. Thus, the results presented here, indicate that released karmitoxin is the main cause for fish kills by K. armiger. Finally, we found that juvenile rainbow trout were six times more sensitive than fish larvae towards K. armiger, indicating that juvenile fish are more sensitive to K. armiger in bloom situations than early larval stages.

Estado nutricional e qualidade de vida de pacientes em tratamento crônico de hemodiálise em lista de espera de um centro de transplante renal em Fortaleza, Ceará / Nutritional status and quality of life in patients under chronic hemodialysis on a waiting list from a kidney transplantation center in Fortaleza, Ceará, Brazil

Objetivo: Investigar a associação entre o estado nutricional e a qualidade de vida de pacientes dialíticos em lista de espera para Transplante Renal (TxR) de um centro de transplante em Fortaleza, Ceará. Métodos: Estudo caráter transversal analítico, realizado entre agosto a outubro de 2018, no qual foram avaliados o estado nutricional (EN) e a qualidade de vida (QV), utilizando a versão brasileira do questionário SF-36, em 52 pacientes de um centro de TxR de um hospital universitário da rede pública de saúde. Resultados: Observou-se que a maioria dos pacientes eram eutróficos de acordo com os parâmetros índice de massa corporal (59,6%), circunferência do braço (48,1%) e circunferência muscular do braço (75,0%); no entanto, de acordo com prega cutânea triciptal, 59,6% da amostra encontrava-se desnutrida. Com relação às dimensões de QV, verificou-se que os "Aspectos Físicos" e "Estado Geral de Saúde" tiveram os piores escores, mas apresentaram associação significativa com o sexo feminino (p=0,046) e com o IMC (p=0,010), respectivamente. Já a dimensão "Capacidade Funcional" apresentou associação significativa com a população masculina (p=0,045). Conclusão: Observou-se comprometimento em algumas das dimensões de QV, as quais sugeriram guardar relação com o sexo e o EN. Assim, ressalta-se a importância da realização periódica do diagnóstico nutricional e da avaliação da QV, visto que os pacientes renais dialíticos listados merecem atenção especial, pois apresentam diversas fragilidades físicas, sociais e emocionais, que podem comprometer aspectos importantes no EN e na QV durante o cuidado antes e após o TXR e impactar no tratamento da doença. (AU)

Objective: To investigate the association between nutritional status and quality of life in patients under hemodialysis from a kidney transplantation center in Fortaleza, Ceará waiting for kidney transplantation. Methods: Cross-sectional analytical study carried out from August to October 2018, in which the patients' nutritional status and quality of life were evaluated using the Brazilian version of the SF-36 questionnaire. A total of 52 patients from a kidney transplantation center belonging to a public university hospital participated. Results: It was observed that most patients were eutrophic according to the body mass index (59.6%), arm circumference (48.1%), and arm muscle circumference (75.0%) parameters; however, based on the tricipital skin-fold measurement, 59.6% of the sample was malnourished. Regarding the quality of life dimensions, the "physical role functioning" and "general health perceptions" had the worst scores, but a significant association with female gender (p = 0.046) and body mass index (p=0.010), respectively. The "physical functioning" dimension, on the other hand, was significantly associated with male gender (p=0.045). Conclusion: Compromise was observed in some quality of life dimensions, and the findings suggest a relationship between quality of life and sex and nutritional status. Patients under hemodialysis deserve special attention as they present several physical, social, and emotional weaknesses that can compromise important nutritional aspects and quality of life before and after transplantation, affecting the treatment of the disease. Thus, the importance of periodic nutritional diagnosis and quality of life assessment is emphasized. (AU)

Risco nutricional e desnutrição em pacientes portadores de doença hepática crônica de um hospital universitário / Nutritional risk and malnutrition in patients with liver cirrhosis in a university hospital

INTRODUÇÃO: a doença hepática crônica leva a diversas alterações orgânicas e funcionais que impactam sobre o estado nutricional. OBJETIVO: avaliar o risco e o estado nutricional de pacientes portadores de Doença Hepática Crônica de um Hospital Universitário. MÉTODOS: estudo transversal, composta por 100 pacientes maiores de 18 anos. Foram coletados dados sóciodemográficos, antropométricos e funcionais. Os parâmetros antropométricos utilizados foram Índice de Massa Corporal, circunferência corporal, dobras cutâneas e Força do Aperto de Mão. Utilizaram-se as seguintes triagens: Avaliação Subjetiva Global, Royal Free Hospital - Global Assessment e Royal Free Hospital Nutritional Prioritizing Tool. Foram utilizados o teste Qui-quadrado de Pearson e correlação de Spearman, considerando nível de significância de 5%. RESULTADOS: observou-se predomínio de homens (57,0%), com idade de média de 51,9±11,69 anos. Houve predomínio de alto risco nutricional (55%) e de desnutrição. Dentre os métodos subjetivos, detectou-se desnutrição principalmente pela Royal Free Hospital - Global Assessment. Considerando-se todos os parâmetros, a desnutrição foi detectada principalmente pela força do aperto de mão, que se correlacionou positivamente com índice de massa corporal (r=0,207; p < 0,039), circunferência muscular do braço (r=0,232; p = 0,020), espessura de músculo adutor do polegar (r=0,206; p = 0,040) e área muscular do braço corrigida (r=0,160; p = 0,113). DISCUSSÃO: estudos mostram que os pacientes com doença hepática têm risco nutricional elevado e alta prevalência de desnutrição. CONCLUSÃO: a população estudada encontrou-se em alto risco nutricional e com desnutrição, sobretudo pela menor força do aperto de mão

INTRODUCTION: liver cirrhosis leads to several organic and functional changes that impact on nutritional status. OBJECTIVE: To assess the risk and nutritional status of patients with liver cirrhosis at a university hospital METHODS: cross-sectional study, comprising 100 patients over 18 years of age. Sociodemographic, anthropometric and functional data were collected. The anthropometric parameters used were body mass index, body cir cum ference, skinfolds and handgrip strength. The following screenings were used: Subjective Global Assessment, Royal Free Hospital - Global Assessment and Royal Free Hospital Nutritional Prioritizing Tool. Pearson's Chi-square test and Spearman's correlation were used, considering a signi ficance level of 5%. RESULTS: There was a predominance of men (57.0%), with a mean age of 51.9 ± 11.69 years. There was a predo minance of high nutritional risk (55%) and malnutrition. Among the subjective methods, malnutrition was detected mainly by the Royal Free Hospital - Global Assessment. Considering all parameters, malnutrition was detected mainly by the handgrip strength, which was positively correlated with body mass index (r = 0.207; p <0.039), arm muscle circumference (r = 0.232; p = 0.020), adductor pollicis muscle thickness (r = 0.206; p = 0.040) and corrected arm muscle area (r = 0.160; p = 0.113). DISCUSSION: studies show that patients with liver disease have a high nutritional risk and a high prevalence of malnutrition. CONCLUSION: The studied population was found to be at high nutritional risk and malnourished, mainly due to the lower handgrip strength

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