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1.
Chem Biodivers ; 21(2): e202301418, 2024 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-38010724

RESUMO

The objective of the present study was to assess the difference in antimicrobial activity of Satureja kitaibelii Wierzb. ex Heuff. essential oil at three growth stages. In addition, using statistical and chemometric tools, we tried to explain why the essential oil from a certain vegetation stage shows the highest antimicrobial activity. S. kitaibelii essential oils demonstrated minimum inhibitory concentration values from 160 to 10000 µg mL-1 , and minimum microbicidal concentration values from 630 to 20000 µg mL-1 . Geraniol, borneol, limonene and p-cymene are the dominant compounds of S. kitaibelii essential oil. The most abundant compound, geraniol, possesses antimicrobial activity in a range of MIC values from 40 to 5000 µg mL-1 and MMC values from 80 to 10000 µg mL-1 . The highest activity of essential oil for all tested strains of microorganisms was recorded in November. Results of statistical analysis indicate that the percentage of dominant compounds of essential oils does not affect the antibacterial activity of essential oils. Chemometric analyses leads to the conclusion that borneol, spathulenol, caryophyllene oxide and limonene can be the main contributors to the antibacterial activity of essential oil from November and that their mutual ratio is important. These results may represent a new methodological approach for future research on essential oils.


Assuntos
Monoterpenos Acíclicos , Anti-Infecciosos , Canfanos , Óleos Voláteis , Satureja , Óleos Voláteis/farmacologia , Limoneno , Anti-Infecciosos/farmacologia , Antibacterianos/farmacologia , Testes de Sensibilidade Microbiana
2.
EMBO Rep ; 22(10): e48018, 2021 10 05.
Artigo em Inglês | MEDLINE | ID: mdl-34402565

RESUMO

Striated muscle undergoes remodelling in response to mechanical and physiological stress, but little is known about the integration of such varied signals in the myofibril. The interaction of the elastic kinase region from sarcomeric titin (A168-M1) with the autophagy receptors Nbr1/p62 and MuRF E3 ubiquitin ligases is well suited to link mechanosensing with the trophic response of the myofibril. To investigate the mechanisms of signal cross-talk at this titin node, we elucidated its 3D structure, analysed its response to stretch using steered molecular dynamics simulations and explored its functional relation to MuRF1 and Nbr1/p62 using cellular assays. We found that MuRF1-mediated ubiquitination of titin kinase promotes its scaffolding of Nbr1/p62 and that the process can be dynamically down-regulated by the mechanical unfolding of a linker sequence joining titin kinase with the MuRF1 receptor site in titin. We propose that titin ubiquitination is sensitive to the mechanical state of the sarcomere, the regulation of sarcomere targeting by Nbr1/p62 being a functional outcome. We conclude that MuRF1/Titin Kinase/Nbr1/p62 constitutes a distinct assembly that predictably promotes sarcomere breakdown in inactive muscle.


Assuntos
Autofagia , Sarcômeros , Conectina/genética , Conectina/metabolismo , Músculo Esquelético/metabolismo , Sarcômeros/metabolismo , Ubiquitinação
3.
Int J Mol Sci ; 24(24)2023 Dec 07.
Artigo em Inglês | MEDLINE | ID: mdl-38139036

RESUMO

The rhizosphere represents a center of complex and dynamic interactions between plants and microbes, resulting in various positive effects on plant growth and development. However, less is known about the effects of indole-3-acetic acid (IAA) on aquatic plants. In this study, we report the characterization of four Pseudomonas strains isolated from the rhizosphere of the common duckweed (Lemna minor) with IAA-degradation and -utilization ability. Our results confirm previous reports on the negative effect of IAA on aquatic plants, contrary to the effect on terrestrial plants. P. putida A3-104/5 demonstrated particularly beneficial traits, as it exhibited not only IAA-degrading and -producing activity but also a positive effect on the doubling time of duckweeds in the presence of IAA, positive chemotaxis in the presence of IAA, increased tolerance to oxidative stress in the presence of IAA and increased biofilm formation related to IAA. Similarly, P. gessardii C31-106/3 significantly shortened the doubling time of duckweeds in the presence of IAA, while having a neutral effect in the absence of IAA. These traits are important in the context of plant-bacteria interactions and highlight the role of IAA as a common metabolite in these interactions, especially in aquatic environments where plants are facing unique challenges compared to their terrestrial counterparts. We conclude that IAA-degrading and -producing strains presented in this study might regulate IAA effects on aquatic plants and confer evolutionary benefits under adverse conditions (e.g., under oxidative stress, excess of IAA or nutrient scarcity).


Assuntos
Araceae , Pseudomonas , Pseudomonas/metabolismo , Ácidos Indolacéticos/metabolismo , Araceae/metabolismo
4.
BMC Infect Dis ; 19(1): 16, 2019 Jan 07.
Artigo em Inglês | MEDLINE | ID: mdl-30612543

RESUMO

BACKGROUND: The aim of the present study was to gain national data on the clinical and microbiological characteristics of community-acquired infections in the Faroe Islands and to compare these data with data from other geographical areas. METHODS: A prospective, observational study involving all patients > = 16 years admitted at the Department of Medicine at the National Hospital, Torshavn, Faroe Islands from October 2013 until April 2015. RESULTS: Of 5279 admissions, 1054 cases were with community-acquired infection and were included in the study. Out of these 1054 cases, 471 did not meet the criteria for SIRS (Systemic Inflammatory Response Syndrome), while the remaining 583 cases had sepsis. Mean age was 68 years. At least one comorbidity was found in 80% of all cases. Documented infections were present in 75%, and a plausible pathogen was identified in 29% of all cases. The most common gram-positive pathogen was Staphylococcus aureus, and the most frequent gram-negative pathogen was Escherichia coli. The most common focus of infection was lower respiratory tract, followed by urinary tract, and skin-soft tissue/bone-joint. Bacteremia was found in 10% of the cases. CONCLUSION: In community-acquired infections in hospitalized patients in the Faroe Islands the lower respiratory tract and the urinary tract were the most frequent foci of infection. Gram-negative pathogens and Escherichia coli were the most frequent pathogens in infection without Systemic Inflammatory Response Syndrome, in sepsis and in bacteremia. Our data on clinical characteristics and microbiological etiology provide new information which may be used to develop local guidelines for the managing of patients admitted with community-acquired infections.


Assuntos
Infecções Comunitárias Adquiridas/microbiologia , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Bacteriemia/epidemiologia , Bacteriemia/microbiologia , Infecções Comunitárias Adquiridas/epidemiologia , Infecções Comunitárias Adquiridas/etiologia , Comorbidade , Infecção Hospitalar/microbiologia , Dinamarca/epidemiologia , Escherichia coli/isolamento & purificação , Escherichia coli/patogenicidade , Feminino , Hospitalização/estatística & dados numéricos , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Sepse/epidemiologia , Sepse/microbiologia , Staphylococcus aureus/isolamento & purificação , Staphylococcus aureus/patogenicidade , Síndrome de Resposta Inflamatória Sistêmica/microbiologia
5.
Eur J Public Health ; 29(4): 741-747, 2019 08 01.
Artigo em Inglês | MEDLINE | ID: mdl-30897194

RESUMO

BACKGROUND: Adverse childhood experiences (ACEs) can increase risks of health-harming behaviours and poor health throughout life. While increases in risk may be affected by resilience resources such as supportive childhood relationships, to date few studies have explored these effects. METHODS: We combined data from cross-sectional ACE studies among young adults (n = 14 661) in educational institutions in 10 European countries. Nine ACE types, childhood relationships and six health outcomes (early alcohol initiation, problem alcohol use, smoking, drug use, therapy, suicide attempt) were explored. Multivariate modelling estimated relationships between ACE counts, supportive childhood relationships and health outcomes. RESULTS: Almost half (46.2%) of participants reported ≥1 ACE and 5.6% reported ≥4 ACEs. Risks of all outcomes increased with ACE count. In individuals with ≥4 ACEs (vs. 0 ACEs), adjusted odds ratios ranged from 2.01 (95% CIs: 1.70-2.38) for smoking to 17.68 (95% CIs: 12.93-24.17) for suicide attempt. Supportive childhood relationships were independently associated with moderating risks of smoking, problem alcohol use, therapy and suicide attempt. In those with ≥4 ACEs, adjusted proportions reporting suicide attempt reduced from 23% with low supportive childhood relationships to 13% with higher support. Equivalent reductions were 25% to 20% for therapy, 23% to 17% for problem drinking and 34% to 32% for smoking. CONCLUSIONS: ACEs are strongly associated with substance use and mental illness. Harmful relationships are moderated by resilience factors such as supportive childhood relationships. Whilst ACEs continue to affect many children, better prevention measures and interventions that enhance resilience to the life-long impacts of toxic childhood stress are required.


Assuntos
Experiências Adversas da Infância/estatística & dados numéricos , Comportamento Perigoso , Relações Pais-Filho , Transtornos Relacionados ao Uso de Substâncias/etiologia , Transtornos Relacionados ao Uso de Substâncias/psicologia , Adolescente , Adulto , Criança , Pré-Escolar , Estudos Transversais , Europa (Continente)/epidemiologia , Feminino , Humanos , Masculino , Medição de Risco , Transtornos Relacionados ao Uso de Substâncias/epidemiologia , Adulto Jovem
6.
Artigo em Inglês | MEDLINE | ID: mdl-28348156

RESUMO

The sporogonic stage of the life cycle of Plasmodium spp., the causative agents of malaria, occurs inside the parasite's mosquito vector, where a process of fertilization, meiosis, and mitotic divisions culminates in the generation of large numbers of mammalian-infective sporozoites. Efforts to cultivate Plasmodium mosquito stages in vitro have proved challenging and yielded only moderate success. Here, we describe a methodology that simplifies the in vitro screening of much-needed transmission-blocking (TB) compounds employing a bioluminescence-based method to monitor the in vitro development of sporogonic stages of the rodent malaria parasite Plasmodium berghei Our proof-of-principle assessment of the in vitro TB activity of several commonly used antimalarial compounds identified cycloheximide, thiostrepton, and atovaquone as the most active compounds against the parasite's sporogonic stages. The TB activity of these compounds was further confirmed by in vivo studies that validated our newly developed in vitro approach to TB compound screening.


Assuntos
Antimaláricos/farmacologia , Malária/transmissão , Plasmodium berghei/efeitos dos fármacos , Animais , Anopheles/efeitos dos fármacos , Antimaláricos/uso terapêutico , Drosophila , Proteínas de Drosophila/metabolismo , Insetos Vetores/efeitos dos fármacos , Malária/tratamento farmacológico , Esporozoítos/efeitos dos fármacos
7.
Ann Pharmacother ; 51(4): 315-322, 2017 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-28228056

RESUMO

OBJECTIVE: To review the pharmacology and clinical data for brexpiprazole in schizophrenia and major depressive disorder (MDD). DATA SOURCES: An English-language literature search using PubMed and MEDLINE was performed using the term brexpiprazole. All articles containing human clinical trial data published up to September 2016 were evaluated for inclusion as well as information from the manufacturer's product labeling. STUDY SELECTION/DATA EXTRACTION: Phase 3 trials for brexpiprazole were evaluated. Key in vitro and animal data were incorporated into the pharmacology and pharmacokinetic sections where appropriate. DATA SYNTHESIS: Four phase 3 trials have evaluated the use of brexpiprazole as a primary therapy for schizophrenia or as an antidepressant adjunct for MDD. For its schizophrenia indication, brexpiprazole was studied in 2 placebo-controlled trials of approximately 1300 patients, with 4 mg of brexpiprazole consistently showing superiority over placebo. For MDD, brexpiprazole was compared with placebo as an adjunct to antidepressants in approximately 1000 patients who had failed trials of 1 to 3 prior antidepressants. The 2-mg and 3-mg dosages of brexpiprazole showed consistent superiority over placebo in the MDD trials. Common treatment emergent adverse effects included akathisia and weight gain. CONCLUSIONS: Brexpiprazole showed efficacy for the treatment of schizophrenia in the range of 2 to 4 mg/d and as an adjunct to antidepressant therapy in MDD when dosed at 2 to 3 mg/d. Advantages of this drug include once-daily dosing, good tolerability, and lack of effect on sexual function. Disadvantages include the lack of long-term safety data and potentially high cost.


Assuntos
Antipsicóticos/uso terapêutico , Transtorno Depressivo Maior/tratamento farmacológico , Quinolonas/uso terapêutico , Esquizofrenia/tratamento farmacológico , Tiofenos/uso terapêutico , Antidepressivos/administração & dosagem , Antidepressivos/efeitos adversos , Antidepressivos/uso terapêutico , Antipsicóticos/administração & dosagem , Antipsicóticos/efeitos adversos , Antipsicóticos/farmacocinética , Ensaios Clínicos Fase III como Assunto , Transtorno Depressivo Maior/metabolismo , Quimioterapia Combinada , Humanos , Quinolonas/administração & dosagem , Quinolonas/efeitos adversos , Quinolonas/farmacocinética , Receptor 5-HT1A de Serotonina/metabolismo , Receptores de Dopamina D2/agonistas , Esquizofrenia/metabolismo , Tiofenos/administração & dosagem , Tiofenos/efeitos adversos , Tiofenos/farmacocinética , Aumento de Peso/efeitos dos fármacos
8.
P T ; 42(1): 41-46, 2017 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-28090164

RESUMO

PURPOSE: To compare the medication history error rate of the emergency department (ED) pharmacy technician with that of nursing staff and to describe the workflow environment. METHODS: Fifty medication histories performed by an ED nurse followed by the pharmacy technician were evaluated for discrepancies (RN-PT group). A separate 50 medication histories performed by the pharmacy technician and observed with necessary intervention by the ED pharmacist were evaluated for discrepancies (PT-RPh group). Discrepancies were totaled and categorized by type of error and therapeutic category of the medication. The workflow description was obtained by observation and staff interview. RESULTS: A total of 474 medications in the RN-PT group and 521 in the PT-RPh group were evaluated. Nurses made at least one error in all 50 medication histories (100%), compared to 18 medication histories for the pharmacy technician (36%). In the RN-PT group, 408 medications had at least one error, corresponding to an accuracy rate of 14% for nurses. In the PT-RPh group, 30 medications had an error, corresponding to an accuracy rate of 94.4% for the pharmacy technician (P < 0.0001). The most common error made by nurses was a missing medication (n = 109), while the most common error for the pharmacy technician was a wrong medication frequency (n = 19). The most common drug class with documented errors for ED nurses was cardiovascular medications (n = 100), while the pharmacy technician made the most errors in gastrointestinal medications (n = 11). CONCLUSION: Medication histories obtained by the pharmacy technician were significantly more accurate than those obtained by nurses in the emergency department.

9.
Infect Dis Rep ; 16(3): 448-457, 2024 May 13.
Artigo em Inglês | MEDLINE | ID: mdl-38804443

RESUMO

The aim of this study was to collect data and analyze mortality among patients hospitalized with community-acquired infections in the Faroe Islands. A prospective observational study was conducted in the Medical Department of the National Hospital of the Faroe Islands from October 2013 to April 2015. Cumulative all-cause, in-hospital, short-term, intermediate-term and long-term mortality rates were calculated. Kaplan-Meier survival curves comparing infection-free patients with infected patients of all severities and different age groups are presented. A log-rank test was used to compare groups. Mortality hazard ratios were calculated for subgroups using Cox regression multivariable models. There were 1309 patients without infection and 755 patients with infection. There were 51% female and 49% male patients. Mean age was 62.73 ± 19.71. Cumulative all-cause mortality and in-hospital mortality were highest in more severe forms of infection. This pattern remained the same for short-term mortality in the model adjusted for sex and age, while there were no significant differences among the various infection groups in regard to intermediate- or long-term survival after adjustment. Overall and short-term mortality rates were highest among those with severe manifestations of infection and those with infection compared to infection-free patients.

10.
J Clin Microbiol ; 51(8): 2686-90, 2013 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-23761151

RESUMO

In immunocompromized patients, including hematopoietic stem cell transplant (HSCT) recipients, life-threatening toxoplasmosis may result from reactivation of previous infection. We report a case of severe disseminated toxoplasmosis that developed early after allogeneic HSCT for T-cell lymphoblastic leukemia/lymphoma in a 15-year-old Toxoplasma gondii-seropositive boy with Nijmegen breakage syndrome, a rare genetic DNA repair disorder associated with immunodeficiency. The donor was the patient's HLA-identical brother. Prophylaxis with cotrimoxazole was discontinued a day before the HSCT procedure. Signs of lung infection appeared as early as day 14 post-HSCT. The presence of tachyzoite-like structures on Giemsa-stained bronchoalveolar lavage (BAL) fluid smears suggested toxoplasmosis. Real-time PCR targeted at the T. gondii AF146527 gene revealed extremely high parasite burdens in both blood and BAL fluid. Although immediate introduction of specific treatment resulted in a marked reduction of the parasite load and transient clinical improvement, the patient deteriorated and died of multiple organ failure on day 39 post-HSCT. Direct genotyping of T. gondii DNA from blood and BAL fluid with the PCR-restriction fragment length polymorphism method revealed type II alleles with SAG1, SAG2, and GRA6 markers but alleles of both type I and type II with GRA7. Additional analysis with 15 microsatellite markers showed that the T. gondii DNA was atypical and genetically divergent from that of the clonal type I, II, and III strains. This is the first report of increased clinical severity of toxoplasmosis associated with an atypical strain in the setting of immunosuppression, which emphasizes the need to diagnose and monitor toxoplasmosis by quantitative molecular methods in cases of reactivation risk.


Assuntos
Transplante de Células-Tronco Hematopoéticas/efeitos adversos , Hospedeiro Imunocomprometido , Toxoplasma/isolamento & purificação , Toxoplasmose/diagnóstico , Adolescente , Líquido da Lavagem Broncoalveolar/parasitologia , Evolução Fatal , Genótipo , Humanos , Masculino , Pneumonia/parasitologia , Pneumonia/patologia , Proteínas de Protozoários/genética , Reação em Cadeia da Polimerase em Tempo Real , Toxoplasma/classificação , Toxoplasma/genética
11.
Life (Basel) ; 13(1)2023 Jan 05.
Artigo em Inglês | MEDLINE | ID: mdl-36676103

RESUMO

Soil salinity is one of the most common abiotic stressors that affects plant growth and development. The aim of this work was to investigate the influence of sodium nitroprusside (SNP), a donor of nitric oxide (NO), on the physiological response of common centaury (Centaurium erythraea) shoots grown under stress conditions caused by sodium chloride (NaCl) in vitro. Centaury shoots were first grown on nutrient medium containing different SNP concentrations (50, 100 and 250 µM) during the pretreatment phase. After three weeks, the shoots were transferred to nutrient media supplemented with NaCl (150 mM) and/or SNP (50, 100 or 250 µM) for one week. The results showed that salinity decreased photosynthetic pigments, total phenolic content and DPPH (1,1-diphenyl-2-picrylhydrazyl radical) concentration. The activities of antioxidant enzymes, namely superoxide dismutase (SOD), catalase (CAT) and peroxidase (POX), were also reduced under salt stress. However, MDA concentration was decreased, while H2O2 and proline content did not drastically change under the stress conditions caused by NaCl. Exogenous application of SNP altered the biochemical parameters of centaury shoots grown under salt stress. In this case, increased photosynthetic pigment content, total phenolics and proline content were noted, with reduced MDA, but not H2O2, concentration was observed. In addition, the exogenous application of SNP increased the degree of DPPH reduction as well as SOD, CAT and POX activities.

12.
J Infect Public Health ; 16 Suppl 1: 111-118, 2023 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-37953110

RESUMO

BACKGROUND: Antimicrobial resistance presents one of the most significant threats to public health. This study aimed to examine antibiotic usage within the general population in the Republic of Serbia and their knowledge, attitudes, and behavior concerning this topic. METHODS: We conducted an online cross-sectional study over two weeks in December 2022, on a sample of 1014 respondents, representative of the Republic of Serbia's population. Predictors of the Antibiotic Knowledge Score (composed of four questions) were analyzed by multivariate ordinal logistic regression. RESULTS: In 2022, 76.8% of the participants from the Serbian population had taken antibiotics, mostly upon a medical prescription, with the most common reasons being upper respiratory tract infections. Only 31.3% of all respondents received any kind of advice about the rational use of antibiotics and half of them changed their opinions on using antibiotics after receiving this information. The average Antibiotic Knowledge Score was 2.6 out of 4, with 32.5% of respondents answering all knowledge questions correctly. The multivariate ordinal logistic regression analysis showed that female gender, higher education level, and the willingness to change opinions regarding the usage of antibiotics after receiving information about the rational use of antibiotics from any available source were significant predictors of better knowledge about antibiotics use. Respondents who were open to changing their opinion after receiving information about the rational use of antibiotics had 28% higher odds of higher antibiotic knowledge scores. CONCLUSION: This is the first population-level study on public knowledge, attitudes, and practices about antibiotic use in Serbia and therefore the baseline for future research and measuring the impact of potential interventions. Our findings underline the importance of taking into account specific population characteristics, knowledge levels, and attitudes when designing educational and intervention strategies for antibiotic use. Policymakers can leverage these findings to target specific groups and enhance the population's knowledge and practices regarding rational antibiotic usage.


Assuntos
Antibacterianos , Conhecimentos, Atitudes e Prática em Saúde , Humanos , Feminino , Estudos Transversais , Sérvia , Antibacterianos/uso terapêutico , Inquéritos e Questionários
13.
Ment Health Clin ; 12(6): 356-359, 2022 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-36644586

RESUMO

Background: The availability of nonapproved psychoactive substances with addiction potential from internet sources poses a significant threat to public health. Polysubstance abuse or inadvertent contamination of preparations may result in clinically challenging intoxication and withdrawal syndromes. Case Report: We report a case of a 32-year-old male with an approximate 2-year history of taking internet-obtained etizolam and tianeptine who presented to the hospital following an overdose. He experienced subsequent withdrawal symptoms consistent with benzodiazepine and opioid withdrawal. Initial attempts at managing symptoms with chlordiazepoxide 25 mg every 6 hours did not relieve his symptoms. On day 3 of admission, addiction medicine was consulted and his regimen was changed to diazepam 80 mg daily with additional as-needed diazepam based on etizolam equivalence. He also received a 5-day methadone taper with plans to transition to buprenorphine in the outpatient setting. Upon discharge he was referred to an addiction medicine specialist who was willing to continue a slow diazepam taper and initiate medications for opioid use disorder to manage both substance use disorders. Discussion: This case report demonstrates the effectiveness of diazepam in managing benzodiazepine withdrawal from etizolam while concurrently using methadone to manage opioid withdrawal symptoms from tianeptine in a hospitalized patient following overdose. We highlight the importance of a warm handoff in considering the outpatient discharge plan.

14.
J Biol Chem ; 285(43): 32720-32733, 2010 Oct 22.
Artigo em Inglês | MEDLINE | ID: mdl-20732876

RESUMO

Eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) protect against cardiovascular disease by largely unknown mechanisms. We tested the hypothesis that EPA and DHA may compete with arachidonic acid (AA) for the conversion by cytochrome P450 (CYP) enzymes, resulting in the formation of alternative, physiologically active, metabolites. Renal and hepatic microsomes, as well as various CYP isoforms, displayed equal or elevated activities when metabolizing EPA or DHA instead of AA. CYP2C/2J isoforms converting AA to epoxyeicosatrienoic acids (EETs) preferentially epoxidized the ω-3 double bond and thereby produced 17,18-epoxyeicosatetraenoic (17,18-EEQ) and 19,20-epoxydocosapentaenoic acid (19,20-EDP) from EPA and DHA. We found that these ω-3 epoxides are highly active as antiarrhythmic agents, suppressing the Ca(2+)-induced increased rate of spontaneous beating of neonatal rat cardiomyocytes, at low nanomolar concentrations. CYP4A/4F isoforms ω-hydroxylating AA were less regioselective toward EPA and DHA, catalyzing predominantly ω- and ω minus 1 hydroxylation. Rats given dietary EPA/DHA supplementation exhibited substantial replacement of AA by EPA and DHA in membrane phospholipids in plasma, heart, kidney, liver, lung, and pancreas, with less pronounced changes in the brain. The changes in fatty acids were accompanied by concomitant changes in endogenous CYP metabolite profiles (e.g. altering the EET/EEQ/EDP ratio from 87:0:13 to 27:18:55 in the heart). These results demonstrate that CYP enzymes efficiently convert EPA and DHA to novel epoxy and hydroxy metabolites that could mediate some of the beneficial cardiovascular effects of dietary ω-3 fatty acids.


Assuntos
Antiarrítmicos/metabolismo , Ácido Araquidônico/metabolismo , Sistema Enzimático do Citocromo P-450/metabolismo , Ácidos Docosa-Hexaenoicos/metabolismo , Ácido Eicosapentaenoico/metabolismo , Miócitos Cardíacos/enzimologia , Animais , Cálcio , Doenças Cardiovasculares/enzimologia , Ácidos Docosa-Hexaenoicos/farmacologia , Ácido Eicosapentaenoico/farmacologia , Humanos , Isoenzimas/metabolismo , Camundongos , Ratos , Ratos Sprague-Dawley
15.
Plants (Basel) ; 10(5)2021 Apr 30.
Artigo em Inglês | MEDLINE | ID: mdl-33946167

RESUMO

In ornamental geophytes, conventional vegetative propagation is not economically feasible due to very slow development and ineffective methods. It can take several years until a new plant is formed and commercial profitability is achieved. Therefore, micropropagation techniques have been developed to increase the multiplication rate and thus shorten the multiplication and regeneration period. The majority of these techniques rely on the formation of new bulbs and their sprouting. Dormancy is one of the main limiting factors to speed up multiplication in vitro. Bulbous species have a period of bulb dormancy which enables them to survive unfavorable natural conditions. Bulbs grown in vitro also exhibit dormancy, which has to be overcome in order to allow sprouting of bulbs in the next vegetation period. During the period of dormancy, numerous physiological processes occur, many of which have not been elucidated yet. Understanding the process of dormancy will allow us to speed up and improve breeding of geophytes and thereby achieve economic profitability, which is very important for horticulture. This review focuses on recent findings in the area of bulb dormancy initiation and release in fritillaries, with particular emphasis on the effect of plant growth regulators and low-temperature pretreatment on dormancy release in relation to induction of antioxidative enzymes' activity in vitro.

16.
Antioxidants (Basel) ; 10(11)2021 Oct 28.
Artigo em Inglês | MEDLINE | ID: mdl-34829590

RESUMO

Duckweed (L. minor) is a cosmopolitan aquatic plant of simplified morphology and rapid vegetative reproduction. In this study, an H. paralvei bacterial strain and its influence on the antioxidative response of the duckweeds to phenol, a recalcitrant environmental pollutant, were investigated. Sterile duckweed cultures were inoculated with H. paralvei in vitro and cultivated in the presence or absence of phenol (500 mg L-1), in order to investigate bacterial effects on plant oxidative stress during 5 days. Total soluble proteins, guaiacol peroxidase expression, concentration of hydrogen peroxide and malondialdehyde as well as the total ascorbic acid of the plants were monitored. Moreover, bacterial production of indole-3-acetic acid (IAA) was measured in order to investigate H. paralvei's influence on plant growth. In general, the addition of phenol elevated all biochemical parameters in L. minor except AsA and total soluble proteins. Phenol as well as bacteria influenced the expression of guaiacol peroxidase. Different isoforms were associated with phenol compared to isoforms expressed in phenol-free medium. Considering that duckweeds showed increased antioxidative parameters in the presence of phenol, it can be assumed that the measured parameters might be involved in the plant's defense system. H. paralvei is an IAA producer and its presence in the rhizosphere of duckweeds decreased the oxidative stress of the plants, which can be taken as evidence that this bacterial strain acts protectively on the plants during phenol exposure.

17.
Sci Rep ; 11(1): 6494, 2021 03 22.
Artigo em Inglês | MEDLINE | ID: mdl-33753792

RESUMO

Cross-talk between phytohormones and sugars is intensely involved in plant metabolism, growth and regeneration. We documented alterations in cytokinin (CK) homeostasis in four developmental stages during de novo shoot organogenesis (DNSO) of kohlrabi (Brassica oleracea var. gongylodes cv. Vienna Purple) seedlings induced by exogenous CKs, trans-zeatin (transZ) and thidiazuron (TDZ), added together with elevated sucrose concentration (6% and 9%). Significant impact of CK and sucrose treatment and their interaction was recorded in all investigated stages, including plantlet development before calli formation (T1 and T2), calli formation (T3) and shoot regeneration (T4). Results showed remarkable increase in total CK levels for transZ treatment, particularly with 9% sucrose. This trend was observed for all physiological and structural groups of CKs. Application of TDZ contributed to little or no increase in CK levels regardless of sucrose concentration. Analysis of expression profiles of organogenesis-related genes involved in auxin transport, CK response, shoot apical meristem formation and cell division revealed that higher sugar concentration significantly downregulated the analysed genes, particularly in T3. This continued on TDZ, but transZ induced an opposite effect with 9% sucrose in T4, increasing gene activity. Our results demonstrated that phytohormone metabolism might be triggered by sucrose signalling in kohlrabi DNSO.


Assuntos
Brassica/metabolismo , Genes de Plantas , Compostos de Fenilureia/farmacologia , Reguladores de Crescimento de Plantas/farmacologia , Sacarose/metabolismo , Tiadiazóis/farmacologia , Zeatina/farmacologia , Brassica/genética , Brassica/crescimento & desenvolvimento , Regulação da Expressão Gênica de Plantas , Homeostase , Meristema/efeitos dos fármacos , Meristema/genética , Meristema/crescimento & desenvolvimento
18.
Sci Rep ; 11(1): 21471, 2021 11 02.
Artigo em Inglês | MEDLINE | ID: mdl-34728697

RESUMO

Plant hormones regulate numerous developmental and physiological processes. Abiotic stresses considerably affect production and distribution of phytohormones as the stress signal triggers. The homeostasis of plant hormones is controlled by their de novo synthesis and catabolism. The aim of this work was to analyse the contents of total and individual groups of endogenous cytokinins (CKs) as well as indole-3-acetic acid (IAA) in AtCKX overexpressing centaury plants grown in vitro on graded NaCl concentrations (0, 50, 100, 150, 200 mM). The levels of endogenous stress hormones including abscisic acid (ABA), salicylic acid (SA) and jasmonic acid (JA) were also detected. The elevated contents of total CKs were found in all analysed centaury shoots. Furthermore, increased amounts of all five CK groups, as well as enhanced total CKs were revealed on graded NaCl concentrations in non-transformed and AtCKX roots. All analysed AtCKX centaury lines exhibited decreased amounts of endogenous IAA in shoots and roots. Consequently, the IAA/bioactive CK forms ratios showed a significant variation in the shoots and roots of all AtCKX lines. In shoots and roots of both non-transformed and AtCKX transgenic centaury plants, salinity was associated with an increase of ABA and JA and a decrease of SA content.


Assuntos
Centaurium/metabolismo , Reguladores de Crescimento de Plantas/metabolismo , Raízes de Plantas/metabolismo , Brotos de Planta/metabolismo , Ácido Salicílico/metabolismo , Estresse Salino , Ácido Abscísico/análise , Ácido Abscísico/metabolismo , Centaurium/crescimento & desenvolvimento , Ciclopentanos/análise , Ciclopentanos/metabolismo , Citocininas/análise , Citocininas/metabolismo , Técnicas In Vitro , Ácidos Indolacéticos/análise , Ácidos Indolacéticos/metabolismo , Oxilipinas/análise , Oxilipinas/metabolismo , Reguladores de Crescimento de Plantas/análise , Raízes de Plantas/crescimento & desenvolvimento , Brotos de Planta/crescimento & desenvolvimento
19.
Acta Chim Slov ; 68(3): 709-717, 2021 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-34897531

RESUMO

Nutrients play an essential role in many metabolic processes whose deficiency or excess can be harmful to the plant itself and through the food chain to both animals and humans. Medicinal plants used in the food and pharmaceutical industries can be contaminated with increased concentrations of heavy metals. The plant species Seseli rigidum and Seseli pallasii from the Balkan Peninsula are used in traditional medicine and spices in the diet, so it was necessary to determine the mineral composition to ensure their safe application. In this work, the mineral composition was determined in medicinal species of the genus Seseli using inductively coupled plasma with optical emission spectrometry (ICP-OES). Two multivariate statistic methods -principal component analysis (PCA) and hierarchical cluster analysis (HCA) were applied to distinguish samples regarding their mineral composition. The mineral composition of both studied species is following the literature data. The results obtained using multivariate statistics methods agree and distinguish certain parts of the tested plants based on the highest content of micro, macro, or trace elements.


Assuntos
Apiaceae/química , Metais/análise , Quimiometria , Análise por Conglomerados , Componentes Aéreos da Planta/química , Raízes de Plantas/química , Análise de Componente Principal , Oligoelementos/análise
20.
Neurodegener Dis Manag ; 10(4): 205-217, 2020 08.
Artigo em Inglês | MEDLINE | ID: mdl-32618483

RESUMO

Schizophrenia is a disabling psychiatric disorder marked by progressive loss of functionality in activities of daily living with each relapse. Antipsychotics, the mainstay of therapy for schizophrenia, treat hallucinations and delusions but may have intolerable side effects, including metabolic disturbances and extrapyramidal symptoms. Brexpiprazole, a second-generation antipsychotic with dopamine partial agonist properties, was approved by the US FDA in 2015 for the treatment of schizophrenia and adjunctive treatment of major depressive disorder and by the EU in 2018 for adults with schizophrenia. Additionally, brexpiprazole has recently been studied for the treatment of agitation in Alzheimer's dementia, an area of largely unmet need. Overall, well-tolerated brexpiprazole expands the armamentarium of treatment options available for these conditions.


Assuntos
Doença de Alzheimer/tratamento farmacológico , Antipsicóticos/uso terapêutico , Quinolonas/uso terapêutico , Esquizofrenia/tratamento farmacológico , Tiofenos/uso terapêutico , Humanos
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