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1.
Metab Brain Dis ; 38(7): 2243-2254, 2023 10.
Artigo em Inglês | MEDLINE | ID: mdl-37490224

RESUMO

OBJECTIVE: Ferulic acid (FA) is a common food ingredient that is abundantly present in various routinely consumed food and beverages. Like many cinnamic acid derivatives, FA produces wide-ranging effects in a dose-dependent manner and various studies link FA consumption with reduced risk of depressive disorders. The aim of this study was to exploit the neuroprotective mechanisms of FA including indoleamine 2,3-dioxygenase (IDO), brain-derived neurotrophic factor (BDNF), and other pro-inflammatory cytokines by employing lipopolysaccharide (LPS)-induced depressive-like behaviour model. METHODS: C57BL/6J male mice were divided into 4 groups consisting of saline (SAL), LPS, FA and Imipramine (IMI). Animals were pretreated orally with FA (10 mg/kg) and IMI (10 mg/kg) for 21 days once daily and all groups except SAL were challenged with LPS (0.83 mg/kg) intraperitoneally on day 21. RESULTS: LPS administration produced a biphasic change in the behaviour of the animals where the animals lost a significant weight and express high immobility time at 24 h. Proinflammatory cytokines including, TNF-α, IL-6, IL-1ß, and IFN-γ were significantly increased along with increased lipid peroxidation and reduced BDNF. Furthermore, the increased kynurenine to tryptophan ratio was indicative of elevated IDO activity. CONCLUSION: The results of this study emphasise that low dose of FA is effective in attenuating depressive-like behaviour by modulating IDO, BDNF and reducing neuroinflammation.


Assuntos
Fator Neurotrófico Derivado do Encéfalo , Depressão , Animais , Camundongos , Masculino , Depressão/tratamento farmacológico , Depressão/induzido quimicamente , Lipopolissacarídeos/toxicidade , Indolamina-Pirrol 2,3,-Dioxigenase , Camundongos Endogâmicos C57BL , Citocinas , Imipramina
2.
Nutr Neurosci ; 25(9): 1836-1844, 2022 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-33814004

RESUMO

Objective: Caffeine (CAF) is one of the most commonly consumed nutritional stimulant in beverages. Interestingly, CAF produces varied effects in a dose-dependent manner, and that makes it one of the most controversial nutritional ingredients. Various studies have linked CAF consumption and reduced risk of depressive disorders. The aim of this study was to investigate the effect of CAF on lipopolysaccharide (LPS)-induced neuroinflammation and depressive-like behaviour.Methods: C57BL/6J male mice were divided into four groups consisting of saline (SAL), LPS, CAF and Imipramine (IMI). Animals were pretreated orally with CAF (10 mg/kg) and IMI (10 mg/kg) for 14 days once daily and all groups except SAL were challenged with LPS (0.83 mg/kg) intraperitoneally on day 14.Results: LPS produced a biphasic behavioural response with a significantly high immobility time and weight loss after 24 h. The brain cytokines (TNF-α, IL-6, IL-1ß, and IFN-γ) levels were remarkably high, along with increased lipid peroxidation and reduced Brain Derived Neurotrophic Factor (BDNF). These biochemical and behavioural changes were significantly alleviated by CAF and IMI chronic treatment.Conclusion: The results of this study implicate that mild-moderate consumption of CAF could impart anti-inflammatory properties under neuroinflammatory conditions by modulating the cytokine and neurotrophic mechanisms.


Assuntos
Fator Neurotrófico Derivado do Encéfalo , Cafeína , Depressão , Doenças Neuroinflamatórias , Animais , Anti-Inflamatórios/farmacologia , Fator Neurotrófico Derivado do Encéfalo/metabolismo , Cafeína/farmacologia , Citocinas/metabolismo , Depressão/induzido quimicamente , Depressão/tratamento farmacológico , Modelos Animais de Doenças , Imipramina/farmacologia , Interleucina-6/metabolismo , Lipopolissacarídeos , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Doenças Neuroinflamatórias/induzido quimicamente , Doenças Neuroinflamatórias/tratamento farmacológico , Estresse Oxidativo , Fator de Necrose Tumoral alfa/metabolismo
3.
Metab Brain Dis ; 37(6): 1969-1976, 2022 08.
Artigo em Inglês | MEDLINE | ID: mdl-35554791

RESUMO

NAD+-dependent histone deacetylases (sirtuins 1-7) have been shown to be involved in various pathophysiological conditions including their involvement in cardiovascular, cancerous, neurodegenerative, immune dysregulation and inflammatory conditions. This study investigates the inflammomodulatory potential of resveratrol (RES), a sirtuin activator and sirtinol (SIR), a sirtuin inhibitor in lipopolysaccharide (LPS)-induced model of sickness behaviour in mice. Male Swiss albino mice were divided into five groups (n = 6) consisting of saline (SAL), LPS, RES, SIR, and fluoxetine (FLU) respectively, each group except LPS was prepared by intraperitoneally (i.p.) administration of SAL (10 mL/kg), RES (50 mg/kg), SIR (2 mg/kg) and FLU (10 mg/kg). Thirty minutes after the treatments, all the groups, except SAL were administered LPS (2 mg/kg, i.p.). The behavioural assays including, open field test, forced swim test, and tail suspension tests were conducted 1 h after LPS challenge. LPS administration significantly reduced the locomotor activity along with inducing a state of high immobility and that was prevented by pretreatment with RES and SIR. Further, various proinflammatory cytokines (TNF-α, IL-6, and IL-1ß), and oxidative stress markers (MDA and GSH) were found to be significantly elevated in the brain homogenates after LPS treatment. SIR pretreatment abrogated the LPS-induced neuroinflammatory and oxidative stress changes, whereas RES was only effective in reducing the oxidative stress and TNF-α levels. The results of this study speculate that the role of SIRT modulators in neuroinflammatory conditions could vary with their dose, regimen and chemical properties. Further studies with detailed molecular and pharmacokinetic profiling will be needed to explore their therapeutic potentials.


Assuntos
Antioxidantes , Inibidores Enzimáticos , Comportamento de Doença , Estresse Oxidativo , Resveratrol , Sirtuínas , Animais , Antioxidantes/farmacologia , Inibidores Enzimáticos/farmacologia , Fluoxetina/farmacologia , Comportamento de Doença/efeitos dos fármacos , Comportamento de Doença/fisiologia , Lipopolissacarídeos , Masculino , Camundongos , Estresse Oxidativo/efeitos dos fármacos , Resveratrol/farmacologia , Sirtuínas/antagonistas & inibidores , Fator de Necrose Tumoral alfa/metabolismo
4.
Mol Cell Neurosci ; 89: 80-94, 2018 06.
Artigo em Inglês | MEDLINE | ID: mdl-29673913

RESUMO

Multiple System Atrophy (MSA) is a progressive neurodegenerative disease characterized by chronic neuroinflammation and widespread α-synuclein (α-syn) cytoplasmic inclusions. Neuroinflammation associated with microglial cells is typically located in brain regions with α-syn deposits. The potential link between microglial cell migration and the transport of pathological α-syn protein in MSA was investigated. Qualitative analysis via immunofluorescence of MSA cases (n = 4) revealed microglial cells bearing α-syn inclusions distal from oligodendrocytes bearing α-syn cytoplasmic inclusions, as well as close interactions between microglia and oligodendrocytes bearing α-syn, suggestive of a potential transfer mechanism between microglia and α-syn bearing cells in MSA and the possibility of microglia acting as a mobile vehicle to spread α-syn between anatomically connected brain regions. Further In vitro experiments using microglial-like differentiated THP-1 cells were conducted to investigate if microglial cells could act as potential transporters of α-syn. Monomeric or aggregated α-syn was immobilized at the centre of glass coverslips and treated with either cell free medium, undifferentiated THP-1 cells or microglial-like phorbol-12-myristate-13-acetate differentiated THP-1 cells (48 h; n = 3). A significant difference in residual immobilized α-syn density was observed between cell free controls and differentiated (p = 0.016) as well as undifferentiated and differentiated THP-1 cells (p = 0.032) when analysed by quantitative immunofluorescence. Furthermore, a significantly greater proportion of differentiated cells were observed bearing α-syn aggregates distal from the immobilized protein than their non-differentiated counterparts (p = 0.025). Similar results were observed with Highly Aggressive Proliferating Immortalised (HAPI) microglial cells, with cells exposed to aggregated α-syn yielding lower residual immobilized α-syn (p = 0.004) and a higher proportion of α-syn positive distal cells (p = 0.001) than cells exposed to monomeric α-syn. Co-treatment of THP-1 groups with the tubulin depolymerisation inhibitor, Epothilone D (EpoD; 10 nM), was conducted to investigate if inhibition of microtubule activity had an effect on cell migration and residual immobilized α-syn density. There was a significant increase in both residual immobilized α-syn between EpoD treated and non-treated differentiated cells exposed to monomeric (p = 0.037) and aggregated (p = 0.018) α-syn, but not with undifferentiated cells. Differentiated THP-1 cells exposed to immobilized aggregated α-syn showed a significant difference in the proportion of distal aggregate bearing cells between EpoD treated and untreated (p = 0.027). The results suggest microglia could play a role in α-syn transport in MSA, a role which could potentially be inhibited therapeutically by EpoD.


Assuntos
Epotilonas/farmacologia , Microglia/metabolismo , Atrofia de Múltiplos Sistemas/metabolismo , Moduladores de Tubulina/farmacologia , alfa-Sinucleína/metabolismo , Idoso , Animais , Encéfalo/metabolismo , Encéfalo/patologia , Linhagem Celular , Linhagem Celular Tumoral , Movimento Celular , Humanos , Microglia/efeitos dos fármacos , Microglia/fisiologia , Atrofia de Múltiplos Sistemas/patologia , Ratos
5.
Metab Brain Dis ; 33(4): 1045-1051, 2018 08.
Artigo em Inglês | MEDLINE | ID: mdl-29516413

RESUMO

Antipsychotic drugs are the mainstay of psychotic disorders. The 'typical' antipsychotic agents are commonly employed for the positive symptoms of schizophrenia, though at an expense of extrapyramidal side effects (EPS). In the present study, we employed haloperidol (HP)-induced catalepsy model in mice to evaluate the role of adenosine receptor antagonist and cyclooxygenase (COX) enzyme inhibitor in the amelioration of EPS. HP produced a full blown catalepsy, akinesia and a significant impairment in locomotion and antioxidant status. Pre-treatment with COX inhibitor; naproxen (NPx) and adenosine receptor antagonist; caffeine (CAF), showed a significant impact on HP-induced cataleptic symptoms. Adenosine exerts pivotal control on dopaminergic receptors and is also involved in receptor internalization and recycling. On the other hand, prostaglandins (PGs) are implicated as neuro-inflammatory molecules released due to microglial activation in both Parkinson's disease (PD) and antipsychotics-induced EPS. The involvement of these neuroeffector molecules has led to the possibility of use of CAF and COX inhibitors as therapeutic approaches to reduce the EPS burden of antipsychotic drugs. Both these pathways seem to be interlinked to each other, where adenosine modulates the formation of PGs through transcriptional modulation of COXs. We observed an additive effect with combined treatment of NPx and CAF against HP-induced movement disorder. These effects lead us to propose that neuromodulatory pathways of dopaminergic circuitry need to be explored for further understanding and utilizing the full therapeutic potential of antipsychotic agents.


Assuntos
Doenças dos Gânglios da Base/tratamento farmacológico , Catalepsia/tratamento farmacológico , Inibidores de Ciclo-Oxigenase/uso terapêutico , Haloperidol/efeitos adversos , Atividade Motora/efeitos dos fármacos , Antagonistas de Receptores Purinérgicos P1/uso terapêutico , Animais , Antipsicóticos/efeitos adversos , Doenças dos Gânglios da Base/induzido quimicamente , Cafeína/farmacologia , Cafeína/uso terapêutico , Catalepsia/induzido quimicamente , Inibidores de Ciclo-Oxigenase/farmacologia , Masculino , Camundongos , Naproxeno/farmacologia , Naproxeno/uso terapêutico , Antagonistas de Receptores Purinérgicos P1/farmacologia , Resultado do Tratamento
6.
Toxicol Mech Methods ; 28(6): 410-414, 2018 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-29338525

RESUMO

Pyocyanin (PCN) is a virulence factor secreted by Pseudomonas aeruginosa (P. aeruginosa) that has been shown to have numerous toxic effects in both in vitro and in vivo studies. Such toxicities include pro-inflammatory and pro-oxidant mediated responses. It is hypothesized that PCN can cross biological membranes and reach the systemic circulation, but no previous studies have investigated this. The aim of this study was, therefore, to quantify PCN in plasma and assess if systemic responses were occurring after localized intranasal administration in C57BL/6 J mice. This was achieved through the plasma quantification of PCN and assessment of changes to behavior using two commonly used tests, the forced swimming test and the open field test. Furthermore, evidence of systemic oxidative stress and inflammation was measured using malondialdehyde (MDA) and TNF-α post PCN exposure. PCN was found to cross into systemic circulation but in a variable manner. Furthermore, significant increases in plasma TNF-α and MDA (both p < 0.001) were observed along with changes in behavior indicative of systemic inflammatory responses.


Assuntos
Comportamento Animal/efeitos dos fármacos , Malondialdeído/sangue , Estresse Oxidativo/efeitos dos fármacos , Piocianina/toxicidade , Fator de Necrose Tumoral alfa/sangue , Fatores de Virulência/toxicidade , Administração Intranasal , Animais , Inflamação , Masculino , Camundongos Endogâmicos C57BL , Atividade Motora/efeitos dos fármacos , Pseudomonas aeruginosa/patogenicidade , Piocianina/sangue , Natação , Fatores de Virulência/sangue
7.
Toxicol Mech Methods ; 27(5): 363-369, 2017 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-28277162

RESUMO

Chemotherapy is an important treatment modality for malignancy but is limited by significant toxicity and it susceptibility to numerous drug interactions. While the interacting effects with medications are well known, there is limited evidence on the interaction with commonly consumed food and natural products. The aim of this study was to evaluate the bioactive constituents of coffee (caffeine and chlorogenic acid) on the cytotoxicity of doxorubicin, gemcitabine, and paclitaxel in vitro. Pretreatment with caffeine (100 nM and 10 µM) sensitized SH-SY5Y cells to doxorubicin-induced toxicity and increased apoptosis and sensitized PC3 cells to gemcitabine-induced toxicity. Pretreatment with 10 µM caffeine decreased total cell reactive oxygen species (ROS) production but increased mitochondrial ROS production. In contrast, caffeine (10 nM and 10 µM) protected cells against gemcitabine-induced toxicity and apoptosis. Similarly, 1 µM and 10 µM caffeine protected cells against paclitaxel-induced toxicity and mitochondrial ROS production. Chlorogenic acid had no effect on chemotherapy-induced toxicity in SH-SY5Y cells. In conclusion, this study provides preliminary evidence that caffeine, not chlorogenic acid, modulates the cytotoxicity of doxorubicin, gemcitabine, and paclitaxel in SH-SY5Y cells via different mechanisms.


Assuntos
Antineoplásicos/farmacologia , Cafeína/farmacologia , Ácido Clorogênico/farmacologia , Desoxicitidina/análogos & derivados , Doxorrubicina/farmacologia , Paclitaxel/farmacologia , Antineoplásicos/administração & dosagem , Apoptose/efeitos dos fármacos , Cafeína/administração & dosagem , Linhagem Celular Tumoral , Sobrevivência Celular/efeitos dos fármacos , Desoxicitidina/administração & dosagem , Desoxicitidina/farmacologia , Relação Dose-Resposta a Droga , Doxorrubicina/administração & dosagem , Interações Medicamentosas , Humanos , Paclitaxel/administração & dosagem , Espécies Reativas de Oxigênio/metabolismo , Gencitabina
8.
Clin Exp Pharmacol Physiol ; 42(2): 186-91, 2015 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-25399964

RESUMO

The effects of the Pseudomonas aeruginosa virulence factor pyocyanin (PCN) on the contractile function of porcine coronary arteries was investigated in vitro. Artery rings (5 mm) were suspended in organ baths containing Krebs' solution for the measurement of isometric tension. The effect of PCN on resting and precontracted coronary arteries was initially investigated with various agents. Arteries were precontracted with prostaglandin (PG) F2α or potassium chloride and endothelium-dependent relaxations were induced by various agents in the presence of PCN. Pyocyanin (0.1-10 µmol/L) evoked small-amplitude, dose-dependent contractions in resting porcine coronary arteries. In addition, PCN amplified the contractile response to PGF2α , but did not alter responses to carbachol. Pyocyanin (0.1-10 µmol/L) significantly inhibited endothelium-dependent relaxations evoked by neurokinin A. Pyocyanin also inhibited relaxations evoked by diethylamine nitric oxide (a nitric oxide donor), forskolin (an adenylate cyclase activator), dibuytyryl-cAMP (a cAMP analogue), 8-bromo-cGMP (a cGMP analogue) and P1075 (a KATP channel activator), but not isoprenaline (ß-adrenoceceptor agonist). These results indicate that physiological concentrations of PCN interfere with multiple intracellular processes involved in vascular smooth muscle relaxation, in particular pathways downstream of nitric oxide release. Thus, PCN may alter normal vascular function in patients infected with P. aeruginosa.


Assuntos
Vasos Coronários/efeitos dos fármacos , Relaxamento Muscular/efeitos dos fármacos , Óxido Nítrico/metabolismo , Piocianina/farmacologia , Vasodilatação/efeitos dos fármacos , 8-Bromo Monofosfato de Adenosina Cíclica/análogos & derivados , 8-Bromo Monofosfato de Adenosina Cíclica/metabolismo , Animais , Colforsina/metabolismo , Vasos Coronários/metabolismo , AMP Cíclico/metabolismo , GMP Cíclico/análogos & derivados , GMP Cíclico/metabolismo , Dietilaminas/farmacologia , Dinoprosta/metabolismo , Feminino , Isoproterenol/farmacologia , Masculino , Contração Muscular/efeitos dos fármacos , Pseudomonas aeruginosa/metabolismo , Suínos
9.
Int J Mol Sci ; 15(11): 20607-37, 2014 Nov 10.
Artigo em Inglês | MEDLINE | ID: mdl-25391045

RESUMO

3-Hydroxy-3-methylglutaryl coenzyme A reductase inhibitors, commonly referred to as statins, are widely used in the treatment of dyslipidaemia, in addition to providing primary and secondary prevention against cardiovascular disease and stroke. Statins' effects on the central nervous system (CNS), particularly on cognition and neurological disorders such as stroke and multiple sclerosis, have received increasing attention in recent years, both within the scientific community and in the media. Current understanding of statins' effects is limited by a lack of mechanism-based studies, as well as the assumption that all statins have the same pharmacological effect in the central nervous system. This review aims to provide an updated discussion on the molecular mechanisms contributing to statins' possible effects on cognitive function, neurodegenerative disease, and various neurological disorders such as stroke, epilepsy, depression and CNS cancers. Additionally, the pharmacokinetic differences between statins and how these may result in statin-specific neurological effects are also discussed.


Assuntos
Sistema Nervoso Central/efeitos dos fármacos , Sistema Nervoso Central/patologia , Inibidores de Hidroximetilglutaril-CoA Redutases/farmacologia , Animais , Sistema Nervoso Central/metabolismo , Neoplasias do Sistema Nervoso Central/tratamento farmacológico , Neoplasias do Sistema Nervoso Central/metabolismo , Neoplasias do Sistema Nervoso Central/patologia , Cognição/efeitos dos fármacos , Depressão/tratamento farmacológico , Depressão/metabolismo , Depressão/patologia , Epilepsia/tratamento farmacológico , Epilepsia/metabolismo , Epilepsia/patologia , Humanos , Inibidores de Hidroximetilglutaril-CoA Redutases/farmacocinética , Inibidores de Hidroximetilglutaril-CoA Redutases/uso terapêutico , Doenças Neurodegenerativas/tratamento farmacológico , Doenças Neurodegenerativas/metabolismo , Doenças Neurodegenerativas/patologia , Acidente Vascular Cerebral/tratamento farmacológico , Acidente Vascular Cerebral/metabolismo , Acidente Vascular Cerebral/patologia
10.
Int J Toxicol ; 32(3): 209-18, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-23525265

RESUMO

The role of autophagy in pyocyanin (PCN)-induced toxicity in the central nervous system (CNS) remains unclear, with only evidence from our group identifying it as a mechanism underlying toxicity in 1321N1 astrocytoma cells. Therefore, the aim of this study was to further examine the role of autophagy in PCN-induced toxicity in the CNS. To achieve this, we exposed 1321N1 astrocytoma and SH-SY5Y neuroblastoma cells to PCN (0-100 µmol/L) and tested the contribution of autophagy by measuring the impact of the autophagy inhibitor 3-methyladenine (3-MA) using a series of biochemical and molecular markers. Pretreatment of 1321N1 astrocytoma cells with 3-MA (5 mmol/L) decreased the PCN-induced acidic vesicular organelle and autophagosome formation as measured using acridine orange and green fluorescent protein-LC3 -LC3 fluorescence, respectively. Furthermore, 3-MA (5 mmol/L) significantly protected 1321N1 astrocytoma cells against PCN-induced toxicity. In contrast pretreatment with 3-MA (5 mmol/L) increased PCN-induced toxicity in SH-SY5Y neuroblastoma cells. Given the influence of autophagy in inflammatory responses, we investigated whether the observed effects in this study involved inflammatory mediators. The PCN (100 µmol/L) significantly increased the production of interleukin-8 (IL-8), prostaglandin E2 (PGE2), and leukotriene B4 (LTB4) in both cell lines. Consistent with its paradoxical role in modulating PCN-induced toxicity, 3-MA (5 mmol/L) significantly reduced the PCN-induced production of IL-8, PGE2, and LTB4 in 1321N1 astrocytoma cells but augmented their production in SH-SY5Y neuroblastoma cells. In conclusion, we show here for the first time the paradoxical role of autophagy in mediating PCN-induced toxicity in 1321N1 astrocytoma and SH-SY5Y neuroblastoma cells and provide novel evidence that these actions may be mediated by effects on IL-8, PGE2, and LTB4 production.


Assuntos
Adenina/análogos & derivados , Astrocitoma/metabolismo , Neuroblastoma/metabolismo , Piocianina/toxicidade , Adenina/administração & dosagem , Adenina/farmacologia , Autofagia/fisiologia , Caspase 3/genética , Caspase 3/metabolismo , Linhagem Celular Tumoral , Dinoprostona/genética , Dinoprostona/metabolismo , Quimioterapia Combinada , Regulação da Expressão Gênica/efeitos dos fármacos , Humanos , Interleucina-8/genética , Interleucina-8/metabolismo , Leucotrieno B4/genética , Leucotrieno B4/metabolismo , Coloração e Rotulagem
11.
Int J Pharm Pract ; 31(1): 15-31, 2023 Mar 13.
Artigo em Inglês | MEDLINE | ID: mdl-36472962

RESUMO

OBJECTIVES: Gamification involves applying game attributes to non-game contexts and its educational use is increasing. It is essential to review the outcomes and the efficacy of gamification to identify evidence to support its use in pharmacy education. THIS ARTICLE: systematically and quantitatively reviews and evaluates the alignment of learning outcomes and the quality of peer-reviewed literature reporting gamification in pharmacy education. KEY FINDINGS: A literature search was undertaken in February 2022 using CINAHL Complete, MEDLINE, Science Direct, Scopus and ERIC databases, via keywords (game* OR gaming OR gamif*) AND pharmac* AND education. Google Scholar was searched using 'gamification of pharmacy education' and 'serious games in pharmacy education'. Data extracted included type of gamified intervention, mode of delivery, game fidelity, intended learning outcomes and outcomes reported. Quality assessments aligned with key aspects of the SQUIRE-EDU Reporting Guidelines. Of 759 abstracts and 95 full-text papers assessed, 66 articles met the inclusion criteria. They described gamification from 12 countries in the education of 8272 pharmacy and health professional students. Gamified interventions ranged from board games to immersive simulations, with escape rooms most frequently reported. Reporting quality was inconsistent, with observed misalignment between intended learning outcomes and outcomes reported, an apparent overreliance on student perceptions as primary data and a lack of reference to reporting guidelines. SUMMARY: Gamification is included in the curricula of many pharmacy degrees, across multiple subject areas. This review identified evidence gaps and reinforces the need for improved quality of gamification research, critical alignment of learning outcomes with evaluation, and use of reporting guidelines.


Assuntos
Educação em Farmácia , Gamificação , Humanos , Aprendizagem , Pessoal de Saúde , Estudantes
12.
Antibiotics (Basel) ; 12(8)2023 Aug 09.
Artigo em Inglês | MEDLINE | ID: mdl-37627724

RESUMO

Pseudomonas aeruginosa (P. aeruginosa) poses a grave clinical challenge due to its multidrug resistance (MDR) phenotype, leading to severe and life-threatening infections. This bacterium exhibits both intrinsic resistance to various antipseudomonal agents and acquired resistance against nearly all available antibiotics, contributing to its MDR phenotype. Multiple mechanisms, including enzyme production, loss of outer membrane proteins, target mutations, and multidrug efflux systems, contribute to its antimicrobial resistance. The clinical importance of addressing MDR in P. aeruginosa is paramount, and one pivotal determinant is the resistance-nodulation-division (RND) family of drug/proton antiporters, notably the Mex efflux pumps. These pumps function as crucial defenders, reinforcing the emergence of extensively drug-resistant (XDR) and pandrug-resistant (PDR) strains, which underscores the urgency of the situation. Overcoming this challenge necessitates the exploration and development of potent efflux pump inhibitors (EPIs) to restore the efficacy of existing antipseudomonal drugs. By effectively countering or bypassing efflux activities, EPIs hold tremendous potential for restoring the antibacterial activity against P. aeruginosa and other Gram-negative pathogens. This review focuses on concurrent MDR, highlighting the clinical significance of efflux pumps, particularly the Mex efflux pumps, in driving MDR. It explores promising EPIs and delves into the structural characteristics of the MexB subunit and its substrate binding sites.

13.
J Urol ; 187(3): 1087-93, 2012 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-22266010

RESUMO

PURPOSE: We determined the effects of Pseudomonas aeruginosa virulence factor pyocyanin on human urothelial cell viability and function in vitro. MATERIALS AND METHODS: RT4 urothelial cells were treated with pyocyanin (1 to 100 µM) for 24 hours. After exposure the treatment effects were measured according to certain end points, including changes in urothelial cell viability, reactive oxygen species formation, caspase-3 activity, basal and stimulated adenosine triphosphate release, SA-ß-gal activity and detection of acidic vesicular organelles. RESULTS: The 24-hour pyocyanin treatment resulted in a concentration dependent decrease in cell viability at concentrations of 25 µM or greater, and increases in reactive oxygen species formation and caspase-3 activity at 25 µM or greater. Basal adenosine triphosphate release was significantly decreased at all tested pyocyanin concentrations while stimulated adenosine triphosphate release was significantly inhibited at pyocyanin concentrations of 12.5 µM or greater with no significant stimulated release at 100 µM. Pyocyanin treated RT4 cells showed morphological characteristics associated with cellular senescence, including SA-ß-gal expression. This effect was not evident at 100 µM pyocyanin and may have been due to apoptotic cell death, as indicated by increased caspase-3 activity. An increase in acridine orange stained vesicular-like organelles was observed in RT4 urothelial cells after pyocyanin treatment. CONCLUSIONS: Exposure to pyocyanin alters urothelial cell viability, reactive oxygen species production and caspase-3 activity. Treatment also results in cellular senescence, which may affect the ability of urothelium to repair during infection. The virulence factor depressed stimulated adenosine triphosphate release, which to our knowledge is a novel finding with implications for awareness of bladder filling in patients with P. aeruginosa urinary tract infection.


Assuntos
Autofagia/efeitos dos fármacos , Piocianina/farmacologia , Bexiga Urinária/citologia , Trifosfato de Adenosina/metabolismo , Análise de Variância , Caspase 3/metabolismo , Células Cultivadas , Senescência Celular/efeitos dos fármacos , Células Epiteliais/efeitos dos fármacos , Humanos , Lisossomos/metabolismo , Espécies Reativas de Oxigênio/metabolismo , Bexiga Urinária/metabolismo , beta-Galactosidase/metabolismo
14.
Arch Toxicol ; 86(2): 275-84, 2012 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-21964636

RESUMO

Central nervous system (CNS) infections due to Pseudomonas aeruginosa are difficult to treat and have a high mortality rate. Pyocyanin, a virulence factor produced by P. aeruginosa, has been shown to be responsible for the majority of P. aeruginosa's pathogenicity in mammalian cells. Several lines of evidence in respiratory cells suggest that this damage is primarily mediated by pyocyanin's ability to generate ROS and deplete host antioxidant defense mechanisms. However, it has yet to be established whether pyocyanin or 1-hydroxyphenazine have potential toxicity to the CNS. Therefore, the aim of this study was to compare the CNS toxicity of pyocyanin and 1-hydroxyphenazine in vitro and to provide insight into mechanisms that underlie this toxicity using 1321N1 astrocytoma cells. To achieve this, we investigated the contribution of oxidative stress and other mediators of cell death including autophagy, senescence and apoptosis. We show that oxidative stress is not a primary mediator of pyocyanin (0-100 µM) and 1-hydroxyphenazine (0-100 µM) induced toxicity in 1321N1 cells. Instead, our results suggest that autophagy may play a central role. The autophagy inhibitor 3-methyladenine (5 mM) protected 1321N1 astrocytoma cells against both pyocyanin and 1-hydroxyphenazine-induced cell injury and increased accumulation of acidic vesicular organelles, a hallmark of autophagy. Furthermore, apoptosis and senescence events may be secondary to autophagy in pyocyanin and 1-hydroxyphenazine-mediated cell injury. In conclusion, this study provides the first evidence on mechanisms underlying the toxicity of both pyocyanin and 1-hydroxyphenazine to astrocytoma cells and provides novel evidence suggesting that this toxicity may be mediated by the formation of acidic vesicular organelles, a hallmark of autophagic cell death.


Assuntos
Adenina/análogos & derivados , Astrócitos/efeitos dos fármacos , Fenazinas/toxicidade , Piocianina/toxicidade , Adenina/farmacologia , Antioxidantes/metabolismo , Apoptose/efeitos dos fármacos , Astrócitos/citologia , Astrócitos/metabolismo , Astrocitoma , Autofagia/efeitos dos fármacos , Linhagem Celular Tumoral , Células Cultivadas , Senescência Celular/efeitos dos fármacos , Interações Medicamentosas , Humanos , Estresse Oxidativo/efeitos dos fármacos , Espécies Reativas de Oxigênio/metabolismo
15.
Artigo em Inglês | MEDLINE | ID: mdl-21851860

RESUMO

Current fishing practices and habitat degradation in most of the world's oceans pose significant threats to marine fish including elasmobranchs. The accurate prediction of survival probability for elasmobranchs subjected to prolonged immobilisation and diminished oxygen availability during capture and a vulnerable state post-release, is reliant on selecting a reliable set of biomarkers to profile as well as using them to design pre-release interventions which minimise elasmobranch death. The purpose of this review is: i) to make a case for the need to develop new biomarkers to use in conjunction with blood chemistry; ii) to briefly present the survival strategies used by other vertebrates subjected to diminished oxygen iii) to discuss new approaches to forecasting the effect that altered physiological and biochemical markers have on long-term survival with a particular emphasis on oxidative stress, the adenylate energy charge, heat shock protein expression and the capacity for repair, so that a more detailed profile of the qualities of elasmobranch survivorship can be constructed. In addition, the review will discuss the relevance of biomarkers to field samples as well as their incorporation into laboratory based research, aimed at providing physiological and biochemical data to inform conservation management.


Assuntos
Elasmobrânquios/metabolismo , Estresse Fisiológico , Animais , Biomarcadores/sangue , Biomarcadores/metabolismo , Previsões , Oxigênio/metabolismo , Análise de Sobrevida
17.
J Sports Sci ; 30(2): 115-20, 2012.
Artigo em Inglês | MEDLINE | ID: mdl-22142020

RESUMO

This study investigated the effects of two different doses of caffeine on endurance cycle time trial performance in male athletes. Using a randomised, placebo-controlled, double-blind crossover study design, sixteen well-trained and familiarised male cyclists (Mean ± s: Age = 32.6 ± 8.3 years; Body mass = 78.5 ± 6.0 kg; Height = 180.9 ± 5.5 cm VO2(peak) = 60.4 ± 4.1 ml x kg(-1) x min(-1)) completed three experimental trials, following training and dietary standardisation. Participants ingested either a placebo, or 3 or 6 mg x kg(-1) body mass of caffeine 90 min prior to completing a set amount of work equivalent to 75% of peak sustainable power output for 60 min. Exercise performance was significantly (P < 0.05) improved with both caffeine treatments as compared to placebo (4.2% with 3 mg x kg(-1) body mass and 2.9% with 6 mg x kg(-1) body mass). The difference between the two caffeine doses was not statistically significant (P = 0.24). Caffeine ingestion at either dose resulted in significantly higher heart rate values than the placebo conditions (P < 0.05), but no statistically significant treatment effects in ratings of perceived exertion (RPE) were observed (P = 0.39). A caffeine dose of 3 mg x kg(-1) body mass appears to improve cycling performance in well-trained and familiarised athletes. Doubling the dose to 6 mg x kg(-1) body mass does not confer any additional improvements in performance.


Assuntos
Desempenho Atlético/fisiologia , Ciclismo/fisiologia , Cafeína/farmacologia , Estimulantes do Sistema Nervoso Central/farmacologia , Exercício Físico/fisiologia , Resistência Física/efeitos dos fármacos , Extratos Vegetais/farmacologia , Adulto , Estatura , Peso Corporal , Cafeína/administração & dosagem , Estimulantes do Sistema Nervoso Central/administração & dosagem , Estudos Cross-Over , Método Duplo-Cego , Frequência Cardíaca/efeitos dos fármacos , Humanos , Masculino , Força Muscular , Consumo de Oxigênio/efeitos dos fármacos , Percepção , Resistência Física/fisiologia , Esforço Físico , Extratos Vegetais/administração & dosagem , Trabalho , Adulto Jovem
18.
Pharmacy (Basel) ; 10(2)2022 Mar 26.
Artigo em Inglês | MEDLINE | ID: mdl-35448700

RESUMO

Extended and immersive gamified pharmacy simulation has been demonstrated to provide transformative learning in pharmacy education, preparing graduates for real-world practice. An international consortium of universities has implemented local adaptations of the Pharmacy Game into their curricula. From early 2020, pharmacy academics modified the delivery of gamified simulation in response to the COVID-19 pandemic, while still aiming to deliver the important learning outcomes of enhanced communication, collaboration, confidence and competence. Australian universities went into full lockdown from March 2020, and the critical gamified simulation at Griffith University was delivered entirely virtually in 2020. An array of synchronous and asynchronous approaches and software platforms was employed, including Microsoft Teams, Forms and Stream plus the online interview platform Big Interview. These allowed for the simulation activities, including dispensing, counselling and clinical cases, to be conducted by students online. In 2021, Griffith University conducted hybrid delivery of its Pharmacy Game, balancing student participation both in person and online. Microsoft Power Apps was added to the hosting platform to enhance the simulation interface, and Power Virtual Agent artificial intelligence chatbots, with natural language processing, were used to enable asynchronous clinical interaction. The combination of learning technologies provided the means to deliver successful gamified simulation in the virtual and hybrid environments while still achieving outstanding learning outcomes from the capstone activity. This paper details the technologies used to virtualize the Australian Pharmacy Game and the analytics available to educators to assess student participation, engagement and performance.

19.
Curr Pharm Teach Learn ; 14(1): 13-22, 2022 01.
Artigo em Inglês | MEDLINE | ID: mdl-35125190

RESUMO

INTRODUCTION: Simulation for education has become popular, but much literature on this modality fails to critically examine the learner's experience, focusing instead on learning outcomes. Learner attitudes should be scrutinised and monitored to appraise a technology-enhanced learning experience as student perceived educational benefits of technology-enhanced learning is reported to be more important than the intrinsic characteristics of any particular medium or tool. This study sought to evaluate pharmacy students' attitudes toward a virtual microbiology simulation. METHODS: The virtual microbiology simulation (VUMIE) was compared with a traditional wet laboratory (lab) in a second-year integrated pharmacotherapeutics course for bachelor of pharmacy students. Data were collected using surveys deployed at baseline (pre-intervention), post-intervention (VUMIE or wet lab), and endpoint (post-interventions). Statistical and qualitative thematic analyses were performed. RESULTS: Learners found the simulation valuable, and outcomes suggest that it is possible for technology-enhanced learning activities to replace face-to-face instruction to some extent, which may be useful given the current challenges with in-person education resulting from COVID-19. More students reported a specific preference for the wet lab rather than VUMIE. CONCLUSIONS: Although technology-enhanced simulation can produce a similar learning experience to a traditional wet lab, this evidence is not sufficient to completely replace the traditional lab experience for clinical courses of study. Technology-enhanced simulation could be considered for just-in-time training before exposure to traditional lab activities, for specific skill acquisition using deliberate practice, and perhaps for standardised assessment for clinical microbiology education.


Assuntos
COVID-19 , Educação em Farmácia , Estudantes de Farmácia , Atitude , Humanos , SARS-CoV-2
20.
Int J Pharm Pract ; 30(6): 580-582, 2022 Dec 31.
Artigo em Inglês | MEDLINE | ID: mdl-36356039

RESUMO

OBJECTIVES: To determine the effectiveness of databases in a pharmacy education literature search. METHODS: Six databases (CINAHL, ERIC, Google Scholar, Ovid MEDLINE, Science Direct and Scopus) were compared for effectiveness in identifying pharmacy education literature. Articles were coded for database of retrieval and results cross-referenced. Sensitivity, precision and number of unique retrievals were calculated. KEY FINDINGS: Scopus yielded the highest sensitivity (65%) and precision (47%). The combination of three databases (Scopus, Science Direct and Google Scholar) identified 97% (n = 64) of 66 relevant articles. CONCLUSIONS: Pharmacy education literature searches require more than one database, ideally Scopus, Science Direct and Google Scholar.


Assuntos
Bibliometria , Armazenamento e Recuperação da Informação , Humanos , Bases de Dados Factuais
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