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2.
Braz. J. Pharm. Sci. (Online) ; 59: e23037, 2023. tab, graf
Artigo em Inglês | LILACS-Express | LILACS | ID: biblio-1520322

RESUMO

Abstract Resolution 658/2022 of the Brazilian Regulatory Agency requires the determination of the permitted daily exposure (PDE) of pharmaceutical agents. Ginkgo biloba L. is used therapeutically to treat memory deficits and other brain diseases. However, published results indicate that more studies are needed to confirm the safety of Ginkgo biloba. This study aimed to evaluate the dry extract of Ginkgo biloba L. leaves PDE as an ingredient in an oral pharmaceutical product in preclinical studies using mice. Acute oral toxicity and repeated dose experiments were performed based on OECD guidelines, as well as genotoxicity tests. The results indicate that Ginkgo biloba L. has low acute toxicity, no liver toxicity, and does not alter blood glucose levels. No changes in weight gain were observed, but food intake decreased in males during the first week of treatment at the highest dose. Hematological parameters were not altered in males, whereas females presented lower leukocyte and lymphocyte counts and higher neutrophil counts at the highest dose. The lipid profile was not altered in males, whereas total cholesterol was increased in females. The estimated PDE was 0.1 mg/day and, when related to the maximum residual concentration, indicates that the cleaning process used is safe and does not require reassessment.

3.
Braz. J. Pharm. Sci. (Online) ; 59: e21738, 2023. graf
Artigo em Inglês | LILACS | ID: biblio-1439498

RESUMO

Abstract Schizophrenia is an illness that affects 26 million people worldwide. However, conventional antipsychotics present side effects and toxicity, highlighting the need for new antipsychotics. We aimed to evaluate the cytotoxicity of haloperidol (HAL), clozapine (CLO), and a new molecule with antipsychotic potential, PT-31, in NIH-3T3 cells. The neutral red uptake assay and the MTT assay were performed to evaluate cell viability and mitochondrial activity, morphological changes were assessed, and intracellular reactive oxygen species (ROS) detection was performed. HAL and CLO (0.1 µM) showed a decrease in cell viability in the neutral red uptake assay and in the MTT assay. In addition, cell detachment, content decrease, rounding and cell death were also observed at 0.1 µM for both antipsychotics. An increase in ROS was observed for HAL (0.001, 0.01 and 1 µM) and CLO (0.01 and 1 µM). PT-31 did not alter cell viability in any of the assays, although it increased ROS at 0.01 and 1 µM. HAL and CLO present cytotoxicity at 0.1 µM, possibly through apoptosis and necrosis. In contrast, PT-31 does not present cytotoxicity to NIH-3T3 cells. Further studies must be performed for a better understanding of these mechanisms and the potential risk of conventional antipsychotics


Assuntos
Esquizofrenia/patologia , Antipsicóticos/efeitos adversos , Clozapina/análise , Haloperidol/análise , Células NIH 3T3/classificação , Vermelho Neutro/farmacologia
4.
Pharmacol Rep ; 74(5): 969-981, 2022 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-36076124

RESUMO

BACKGROUND: Vortioxetine hydrobromide (VXT), a new therapeutic option in the treatment of major depressive disorder, is a poorly soluble drug, and instability under stress conditions has been reported. The aim of the present study was to prepare VXT liposomes (VXT-Ls) with an antidepressant-like effect, to improve drug stability and reduce toxicity of the free drug. METHODS: Liposomes were prepared using the thin lipid film hydration method and properly characterized. Forced degradation studies were conducted in photolytic and oxidative conditions. The cytotoxicity was evaluated in VERO cells through MTT assay and in vivo toxicity was assessed in mice. The antidepressant-like effect in mice was confirmed using the open-field test paradigm and tail suspension test. RESULTS: The optimized VXT-Ls have multilamellar vesicles with an average size of 176.74 nm ± 2.43. The liposomal formulation increased the stability of VXT. VERO cell viability was maintained at around 40% when the VXT-Ls were tested at higher concentrations and no signs of acute toxicity were observed in mice. The antidepressant-like effect was effective, for VXT-Ls, at doses ranging from 2.5 mg/kg to 10 mg/kg, measured by the tail suspension test in mice. The non-liposomal formulation was effective at a dose of 10 mg/kg. The open field test was performed and any unspecific changes in locomotor activity were revealed. CONCLUSIONS: Liposomes seem to be a promising alternative for an oral VXT formulation at lower doses (2.5 mg/kg).


Assuntos
Transtorno Depressivo Maior , Lipossomos , Chlorocebus aethiops , Camundongos , Animais , Estabilidade de Medicamentos , Vortioxetina , Células Vero , Antidepressivos/toxicidade , Lipídeos
5.
J Tradit Complement Med ; 12(4): 309-317, 2022 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-35747347

RESUMO

Background and aim: Campomanesia xanthocarpa Berg. (Myrtaceae) present several pharmacological actions, but there are no reports on its antidepressant-like potential. This study investigated the antidepressant-like effect and mechanism of action of Campomanesia xanthocarpa seeds extract obtained from supercritical CO2 (40 °C, 250 bar). Experimental procedure: Mice were orally treated with the extract 1 h before the TST. To investigate the involvement of the monoaminergic system in the antidepressant-like activity of the extract, pharmacological antagonists were administered prior to the acute oral administration of the extract (60 mg/kg). Also, the interaction of the extract with antidepressants was assessed in the tail suspension test (TST). The in vitro inhibitory potential of C. xanthocarpa seeds extract towards MAO A and MAO B enzymes was tested in vitro. Results and conclusion: Animals treated with Campomanesia xanthocarpa seeds extract showed a significant reduction in the immobility time in the TST. Mice pretreatment with SCH23390, sulpiride, prazosin, yohimbine, and p-chlorophenylalanine prevented the anti-immobility effect of the extract in the TST. The combined administration of sub-effective doses of the extract with imipramine, bupropion and fluoxetine significantly reduced mice immobility time in the TST. The extract showed MAO A inhibitory activity (IC50 = 151.10 ± 5.75 µg/mL), which was greater than that toward MAO B (IC50 > 400 µg/mL).The extract of Campomanesia xanthocarpa seeds obtained by supercritical CO2 shows antidepressant-like activity, which relies on the activation of the monoaminergic neurotransmission (serotoninergic, dopaminergic and noradrenergic), suggesting that this species might represent a resource for developing new antidepressants.

6.
Toxicol Mech Methods ; 32(9): 705-715, 2022 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-35410575

RESUMO

Schizophrenia is a psychiatric disorder that affects 1% of the world population and is treated with antipsychotics, which may induce important biochemical and hematological alterations. Since it is necessary to verify the safety of new molecules with antipsychotic potential, the present study aimed to evaluate the oral toxicity of PT-31, a putative α2-adrenoreceptor agonist, after acute (2000 mg/kg) and repeated doses (28 days) gavage treatment, in three different doses: minimum effective dose in animal models (10 mg/kg), twice the dose (20 mg/kg), and four times the dose (40 mg/kg), as recommended by the OECD guidelines. Balb/C female adult mice were used, and biochemical, hematological, and histopathological analyses were performed. PT-31 10 and 20 mg/kg did not cause biochemical alterations related to hepatic and renal toxicity, and neither altered glycemic and lipid profiles. The preclinical dose of PT-31 also did not promote mice histopathological changes in the liver, kidney, and brain. In the hematimetric parameters, PT-31 only increased HGB at 20 mg/kg, and MCH and MCHC at 40 mg/kg. However, all the tested doses of PT-31 showed platelet increase, which must be better investigated. Therefore, further studies are needed to investigate the safety of PT-31 as a potential antipsychotic drug.


Assuntos
Antipsicóticos , Animais , Antipsicóticos/toxicidade , Feminino , Humanos , Rim , Lipídeos , Fígado , Camundongos , Testes de Toxicidade Aguda
7.
Drug Chem Toxicol ; 45(2): 822-833, 2022 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32552192

RESUMO

Meloxicam is the non-steroidal anti-inflammatory drug most used in small animals; however, studies on genotoxicity, oxidative stress, and histopathologic alterations in cardiac tissue are limited, especially at therapeutical doses used in these animals. This study evaluated the toxic effects caused by the treatment involving repeated low at higher doses of meloxicam in mice, by genotoxicity, oxidative stress, and histopathological parameters. Mice (CF1, male) received, by gavage, meloxicam at the therapeutic dose indicated for small animals (0.1 mg/kg) and at higher doses (0.5 and 1 mg/kg) for 28 days. Later, they were euthanized for blood and organ analysis. Oxidative stress was analyzed by the plasma ferric reduction capacity (FRAP) and catalase, and genotoxicity, by the comet assay and the micronucleus test. Heart, liver, lung, and kidney tissues were analyzed by the histology, and stomach and duodenum were analyzed with a magnifying glass. The relative weight of organs did not present significant alterations. However, congestion of duodenum vessels was observed at the three tested doses and caused hyperemia of stomach mucosa at 1 mg/kg. In the heart histology there was a reduction in the number of cardiomyocytes, accompanied by an increase in cell diameter (possible cell hypertrophy) dose-dependent. The highest tested dose of meloxicam also increased the DNA damage index, without alterations in the micronucleus test. Meloxicam did not affect the catalase activity but increased the FRAP (1 mg/kg). Meloxicam at the dose prescribed for small animals could potentially cause cardiac histopathologic alterations and genotoxic effects.


Assuntos
Dano ao DNA , Coração , Animais , Ensaio Cometa , Fígado , Masculino , Meloxicam/toxicidade , Camundongos , Testes para Micronúcleos
8.
Braz. J. Pharm. Sci. (Online) ; 58: e20812, 2022. tab
Artigo em Inglês | LILACS | ID: biblio-1420439

RESUMO

Abstract Depression plays an important role in non-adherence to medical recommendations. Fluoxetine is a first line of depression treatment. This study aimed to evaluate adherence to drug therapy in fluoxetine users by different methods. A cross-section study was conducted with 53 depressed patients on fluoxetine for at least six months. Drug therapy adherence was assessed by validated questionnaires [Brief Medication Questionnaire (BMQ) and Morisky-Green test (MG)] and by the blood concentration of fluoxetine and its active metabolite norfluoxetine. Blood samples were taken before the daily first dose of fluoxetine. The plasmatic concentration of fluoxetine and norfluoxetine indicated that 58.5% volunteers were within the recommended therapeutic range and thus considered adherent to drug therapy. However, questionnaires indicated a non-adherent majority: 41.5% patients had a high degree of adherence in MG and only 13.2% were adherent to pharmacological treatment in BMQ. Most fluoxetine users showed a plasma concentration of fluoxetine and norfluoxetine within the therapeutic range, despite the low adherence to the drug therapy evaluated by the questionnaires. Thus, we suggest that plasma levels of fluoxetine and norfluoxetine could be used as the main method to check adherence to treatment.


Assuntos
Humanos , Masculino , Feminino , Pessoa de Meia-Idade , Fluoxetina/análise , Inquéritos e Questionários/estatística & dados numéricos , Depressão/diagnóstico
9.
Behav Pharmacol ; 30(7): 574-587, 2019 10.
Artigo em Inglês | MEDLINE | ID: mdl-31206371

RESUMO

Evidence of changes in central noradrenergic activity has been reported in schizophrenic patients and studies indicate that activation of the α2-adrenoceptor improves memory and neuroprotection. In this study, a new imidazolidine derivative 3-(2-chloro-6-fluorobenzyl)-imidazolidine-2,4-dione, PT-31, a putative α2A-adrenoceptor agonist, was evaluated in mouse models predictive of efficacy in the treatment of positive and cognitive symptoms of schizophrenia, as well as its ability to promote cerebellar granule cell survival in vitro, in the presence or absence of glutamate (100 µmol/l). PT-31 prevented apomorphine-induced climbing and the ketamine-induced hyperlocomotion, without inducing catalepsy or motor impairment. PT-31 protected against the impairment of prepulse inhibition induced by apomorphine, (±)-DOI, and ketamine. The molecule did not affect mouse short nor long-term memory per se, but it protected against ketamine-induced memory impairment when administered at different stages of the memory process (acquisition, consolidation, and retrieval) in the novel object recognition task. When added to cultured cerebellar granule neurons, PT-31 was not toxic per se and protected neurons from glutamate-induced apoptosis. In conclusion, PT-31 displayed a preclinical pharmacology predictive of neuroprotective effects and efficacy in relieving schizophrenia symptoms, without inducing motor side effects, suggesting that it could represent a molecular scaffold for antipsychotic drug development.


Assuntos
Esquizofrenia/tratamento farmacológico , Animais , Antipsicóticos/farmacologia , Apomorfina/farmacologia , Catalepsia/induzido quimicamente , Cognição/efeitos dos fármacos , Modelos Animais de Doenças , Agonistas de Dopamina/farmacologia , Imidazolidinas/farmacologia , Masculino , Memória/efeitos dos fármacos , Transtornos da Memória/tratamento farmacológico , Memória de Longo Prazo/efeitos dos fármacos , Camundongos , Camundongos Endogâmicos , Ratos , Ratos Wistar , Receptores Adrenérgicos/metabolismo , Psicologia do Esquizofrênico
10.
J Ethnopharmacol ; 236: 21-30, 2019 May 23.
Artigo em Inglês | MEDLINE | ID: mdl-30802613

RESUMO

ETHNOPHARMACOLOGICAL RELEVANCE: Popular medicine use stems of Philodendron bipinnatifidum (Araceae) in inflammation cases, such as in erysipelas, as well as orchitis and rheumatism treatment. The present study, conducted for the first time in literature, investigate the antinociceptive and anti-inflammatory activities of P. bipinnatifidum stems ethyl acetate extract (EPB). MATERIALS AND METHODS: GC/MS and HPLC analysis were performed for EPB extract. We used EPB at 250, 375 and 500 mg/kg (oral route, p.o.) in male Swiss mice. The antinociceptive activity of the plant extract assessed by acetic acid induced writhing and formalin tests. To investigate the possible participation of opioid system in EPB-mediated effects, we previously administered naloxone to the mice. Anti-inflammatory activity was evaluated using carrageenan-induced paw oedema. The open-field test aimed to investigate the possible EPB effects on the locomotor and exploratory activities. To assess the protective role of EPB on carrageenan-induced oxidative stress, the levels of NPSH, TBARS, as well as SOD and CAT activities were evaluated in blood and paw tissue. The acute toxicity of the EPB was investigated using OECD 423 guideline. RESULTS: The EPB chemical analysis by GC/MS and HPLC revealed the presence of flavonoids (luteolin and quercetin) and phytosterols (ß-sitosterol and stigmasterol). The oral treatment with the EPB inhibited mice abdominal writhings (P < 0.01) at 375 and 500 mg/kg, and reduced the formalin effect at the first-phase (500 mg/kg, P < 0.05) and also at the second-phase (500 mg/kg, P < 0.001) of the test. EPB (375 and 500 mg/kg) did not alter spontaneous locomotion in open field test, however the number of fecal bolus was significantly lower for the EPB group at 500 mg/kg when compared to the vehicle group (P < 0.05). The pretreatment with naloxone caused significant inhibition of antinociceptive activity induced by EPB in the formalin test, revealing the possible involvement of opioid receptors. EPB extract administered at 500 mg/kg (p.o.) prevented carrageenan-induced paw oedema (P < 0.05 and 0.01) until 6 h after carragenan injection. Evaluation of TBARS and NPSH levels, SOD and CAT activities in the blood and paw tissue of animals submitted to the carrageenan assay suggested that the anti-inflammatory effect of EPB may be linked to oxidative stress inhibition. The acute administration of the EPB (2000 mg/kg, p.o.) caused no mortality, demonstrating low toxicity. CONCLUSIONS: The extract of P. bipinnatifidum displays antinociceptive and anti-inflammatory activities, causing no toxicological effects. The pharmacological activity of this vegetal species may be related to the presence of flavonoids and phytosterols. Our results support the ethnomedical use of this vegetal species as analgesic and anti-inflammatory agent.


Assuntos
Analgésicos/uso terapêutico , Anti-Inflamatórios/uso terapêutico , Comportamento Animal/efeitos dos fármacos , Dor/tratamento farmacológico , Philodendron/química , Extratos Vegetais/uso terapêutico , Analgésicos/isolamento & purificação , Animais , Anti-Inflamatórios/isolamento & purificação , Edema/induzido quimicamente , Edema/tratamento farmacológico , Inflamação , Masculino , Camundongos , Dor/induzido quimicamente , Fitoterapia , Extratos Vegetais/isolamento & purificação
11.
Molecules ; 24(1)2019 Jan 04.
Artigo em Inglês | MEDLINE | ID: mdl-30621160

RESUMO

Quillaja saponaria Molina represents the main source of saponins for industrial applications. Q. saponaria triterpenoids have been studied for more than four decades and their relevance is due to their biological activities, especially as a vaccine adjuvant and immunostimulant, which have led to important research in the field of vaccine development. These saponins, alone or incorporated into immunostimulating complexes (ISCOMs), are able to modulate immunity by increasing antigen uptake, stimulating cytotoxic T lymphocyte production (Th1) and cytokines (Th2) in response to different antigens. Furthermore, antiviral, antifungal, antibacterial, antiparasitic, and antitumor activities are also reported as important biological properties of Quillaja triterpenoids. Recently, other saponins from Q. brasiliensis (A. St.-Hill. & Tul.) Mart. were successfully tested and showed similar chemical and biological properties to those of Q. saponaria barks. The aim of this manuscript is to summarize the current advances in phytochemical and pharmacological knowledge of saponins from Quillaja plants, including the particular chemical characteristics of these triterpenoids. The potential applications of Quillaja saponins to stimulate further drug discovery research will be provided.


Assuntos
Saponinas de Quilaia/química , Quillaja/química , Terpenos/química , Células Th1/efeitos dos fármacos , Humanos , ISCOMs/química , ISCOMs/uso terapêutico , Imunomodulação/efeitos dos fármacos , Saponinas de Quilaia/uso terapêutico , Linfócitos T Citotóxicos/efeitos dos fármacos , Terpenos/uso terapêutico , Células Th1/imunologia , Células Th2/efeitos dos fármacos
12.
Neurosci Lett ; 687: 177-182, 2018 11 20.
Artigo em Inglês | MEDLINE | ID: mdl-30266672

RESUMO

INTRODUCTION: Parkinson's Disease (PD) is a progressive neurodegenerative disorder, hallmark of which is loss of nigral dopaminergic neurons. Since a Hypericum polyanthemum extract inhibits monoamine reuptake and some of its constituents present cytotoxic properties, the aim of this study was to evaluate the effect of this extract in an animal PD model. METHODS: Adult Wistar rats (110 days old) received 6-hydroxydopamine (6-OHDA) infusions into the right medial forebrain bundle. A cyclohexane extract from aerial parts of H. polyanthemum (POL; 90 mg/kg/administration; gavage) was administered in three different regimens. In Regimens 1 and 2, rats received 3 administrations of POL starting 4 or 24 h after 6-OHDA infusion, respectively. In Regimen 3, these administrations were carried out 1 day before any evaluation of ipsilateral rotational activity induced by methylphenidate (MP, 20 mg/kg, i.p.). MP was administered 10, 45, and 85 days after 6-OHDA infusion in all groups. Nigral tyrosine hydroxylase (TH) immunocontent was evaluated 120 days after 6-OHDA infusion in animals submitted to Regimen 2 only. The effect of POL on apomorphine-induced climbing behavior in non-lesioned adult CF1 mice (60 days old) treated with POL was also evaluated. RESULTS: Regimen 2 increased MP-induced rotational activity and decreased nigral TH levels in 6-OHDA-lesioned rats. Rotational activity was not altered in regimens 1 and 3. In addition, no change in climbing behavior was observed in non-lesioned mice. CONCLUSION: Together, these results indicate that, in 6-OHDA-lesioned rats, a cyclohexane H. polyanthemum extract potentiates neurotoxicity and MP-induced motor asymmetry depending on the time of administration. In the short term, it seems to not act directly on mice dopaminergic receptors.


Assuntos
Comportamento Animal/efeitos dos fármacos , Hidroxidopaminas/farmacologia , Hypericum/metabolismo , Atividade Motora/efeitos dos fármacos , Animais , Modelos Animais de Doenças , Dopamina/farmacologia , Fármacos Neuroprotetores/farmacologia , Síndromes Neurotóxicas/tratamento farmacológico , Ratos Wistar , Substância Negra/efeitos dos fármacos , Substância Negra/metabolismo , Tirosina 3-Mono-Oxigenase/metabolismo
13.
Braspen J ; 32(4): 375-379, out-dez.2017. tab
Artigo em Português | LILACS | ID: biblio-906846

RESUMO

Introdução: A cirurgia cardíaca é realizada quando a probabilidade de uma vida útil de um paciente é maior com o tratamento cirúrgico do que com o clínico. Na cirurgia ocorre a resposta metabólica ao trauma, que é potencializada pelo jejum pré-operatório prolongado. O objetivo deste estudo foi analisar o comportamento dos pacientes submetidos à cirurgia cardíaca com abreviação do jejum pré-operatório a partir da administração de suplemento nutricional oral com carboidratos e proteínas. Método: Realizada uma pesquisa do tipo estudo de caso na Unidade de Terapia Intensiva Adulta de um Hospital Público da região metropolitana de Porto Alegre, Rio Grande do Sul. Os casos analisados foram de pacientes que realizaram abreviação de jejum pré-operatório de cirurgia cardíaca, no período de outubro a novembro de 2015. Resultados: Avaliados três pacientes, do sexo masculino, com idade entre 47 e 73 anos, que realizaram cirurgia cardíaca com abreviação do jejum pré-operatório três horas antes da cirurgia com suplemento nutricional com carboidrato e proteína, isento de lipídeos e fibras. Dois pacientes apresentaram complicações pós-operatórias, não relacionadas à abreviação do jejum. A média da glicemia capilar pós-operatória foi de 112 mg/dl. Não houve casos de broncoaspiração, náuseas ou vômitos. O tempo médio de internação hospitalar foi de 7,8 dias. Conclusão: A abreviação do jejum pré-operatório em cirurgia cardíaca é relevante para melhorar o desfecho do paciente cirúrgico, em função da melhoria do perfil glicêmico, redução da resposta metabólica ao trauma, maior satisfação do paciente, menor tempo de internação hospitalar e consequente redução dos custos.(AU)


Introduction: Cardiac surgery is performed when the likelihood of life span of a patient is higher with surgery than with medical treatment. During surgery, the metabolic response to trauma takes place, which is enhanced by prolonged preoperative fasting. The objective of this study was to analyze the behavior of patients undergoing cardiac surgery with abbreviation of preoperative fasting from oral nutritional supplement administration with carbohydrates and protein. Methods: We conducted a case study research at the Adult Intensive Care Unit (ICU) of a public hospital located in the metropolitan area of Porto Alegre, Rio Grande do Sul, Brazil. We analyzed cases from patients undergoing reduced preoperative fasting time prior to cardiac surgery during the months of October and November 2015. Results: We evaluated three male patients, aged 47 to 73 years old. Three hours prior to surgery they were given a carbohydrate and protein enriched nutritional supplement, which was lipid and fiber free. Two of the patients had postoperative complications unrelated to the reduced fasting time. The average postoperative blood glucose was 112 mg/dl. There were no cases of pulmonary aspiration, nausea, or vomiting. The average hospital stay was 7.8 days. Conclusion: The reduction of preoperative fasting time in cardiac surgery appears to improve the outcome of surgical patients. This is shown here by the improved glucose profiles; reduced metabolic response to trauma; patient satisfaction; shorter hospital stay; and cost reduction observed.(AU)


Assuntos
Humanos , Masculino , Feminino , Cirurgia Torácica , Jejum , Assistência Perioperatória , Metabolismo
14.
Bioorg Med Chem Lett ; 25(10): 2247-50, 2015.
Artigo em Inglês | MEDLINE | ID: mdl-25900218

RESUMO

Previously we designed a series of pyridinic anticholinesterasic compounds based on molecular hybridization between tacrine and the natural piperidine alkaloid (-)-3-O-acetylspectaline isolated from Senna spectabilis. Based on the information that the cholinergic system has an important role in the treatment of schizophrenia and depression, we herein report the evaluation of a series of pyridinic compounds in animal models for antipsychotic and antidepressant-like activities. Compound 2 decreased the immobility time of mice in the forced swimming test (5 and 10mg/kg p.o.) and prevented the climbing behavior induced by apomorphine (10mg/kg, p.o.), without impairing animals locomotor activity.


Assuntos
Doenças do Sistema Nervoso Central/tratamento farmacológico , Piperidinas/síntese química , Piperidinas/uso terapêutico , Piridinas/síntese química , Animais , Antidepressivos/síntese química , Antidepressivos/química , Antidepressivos/farmacologia , Comportamento Animal/efeitos dos fármacos , Modelos Animais de Doenças , Camundongos , Piperidinas/química , Piperidinas/farmacologia , Piridinas/química , Piridinas/farmacologia , Esquizofrenia/tratamento farmacológico
15.
Food Chem Toxicol ; 50(7): 2349-55, 2012 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-22525862

RESUMO

Hypericum polyanthemum, a South Brazilian species showed antidepressant-like and antinociceptive effects in rodents. Since limited information is available on the toxicity and safety profile of the Hypericum genus, we therefore investigated whether H. polyanthemum cyclo-hexane extract (POL) treatment could be associated with toxicity in preclinical setting using mice as an experimental model. These toxicity studies were based on the guidelines of the Organization for Economic Cooperation and Development (OECD-guidelines 423 and 407). Animals received POL single dose (2000 mg/kg, p.o.) or daily for 28-days (90, 450 and 900 mg/kg, p.o.). Acute toxicity study did not detect any clinical signs, changes in behavior or mortality. In repeated dose toxicity study, POL affected the body weight gain and induced biochemical, hematological and liver histological changes at 450 and 900 mg/kg. Mice treated with POL 90 mg/kg did not show any toxicity signs. In conclusion H. polyanthemum can be classified as safe (category 5) according to OECD acute toxicity parameters. However, the alterations observed after repeated treatment with high doses suggest that the liver could be the target organ on potential H. polyanthemum toxicity and point to the need of further toxicity studies.


Assuntos
Hypericum/química , Extratos Vegetais/toxicidade , Animais , Cromatografia Líquida de Alta Pressão , Relação Dose-Resposta a Droga , Comportamento Alimentar/efeitos dos fármacos , Masculino , Camundongos , Tamanho do Órgão/efeitos dos fármacos , Testes de Toxicidade Aguda , Aumento de Peso/efeitos dos fármacos
16.
Planta Med ; 77(4): 334-9, 2011 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-20945276

RESUMO

The crude extracts of HYPERICUM species native to South Brazil showed analgesic and antidepressant-like effects in rodents. The chemical characterization of these species revealed that they are rich in flavonoids and phloroglucinol derivatives. In the present study a detailed investigation was performed on the activities of hyperoside (HYP), a common flavonoid in the genus HYPERICUM. Hyperoside was obtained from the aerial parts of H. CAPRIFOLIATUM by chromatographic procedures. Mice treated with single doses (10, 20 and 40 mg/kg i.p.) did not present signs of toxicity or weight loss. At 20 and 40 mg/kg i.p. the mice exploratory behavior in the open field test was reduced. At 20 mg/kg i. p. the pentobarbital sleeping time increased, but not the sleeping latency. No activity was found on the hot-plate (10 and 20 mg/kg i.p.) or in the acetic acid-induced writhing test (20 and 40 mg/kg p.o.). Nevertheless, an antidepressant-like effect in the forced swimming test in mice and rats was observed (HYP 10 and 20 mg/kg i.p. in mice; HYP 1.8 mg/kg/day p.o. in rats). The antidepressant-like effect in rats was prevented by the administration of sulpiride (50 mg/kg i.p.) a D2 antagonist. In conclusion, hyperoside was found to present a depressor effect on the central nervous system as well as an antidepressant-like effect in rodents which is, at least in part, mediated by the dopaminergic system.


Assuntos
Antidepressivos/uso terapêutico , Comportamento Animal/efeitos dos fármacos , Depressão/tratamento farmacológico , Hypericum/química , Fitoterapia , Quercetina/análogos & derivados , Receptores de Dopamina D2/metabolismo , Animais , Antidepressivos/isolamento & purificação , Antidepressivos/farmacologia , Brasil , Depressores do Sistema Nervoso Central/isolamento & purificação , Depressores do Sistema Nervoso Central/farmacologia , Antagonistas de Dopamina/farmacologia , Antagonistas dos Receptores de Dopamina D2 , Masculino , Camundongos , Camundongos Endogâmicos , Pentobarbital , Componentes Aéreos da Planta , Extratos Vegetais/química , Extratos Vegetais/farmacologia , Extratos Vegetais/uso terapêutico , Quercetina/isolamento & purificação , Quercetina/farmacologia , Quercetina/uso terapêutico , Ratos , Ratos Wistar , Sono/efeitos dos fármacos , Sulpirida/farmacologia , Natação
17.
RBCF, Rev. bras. ciênc. farm. (Impr.) ; 42(3): 369-394, jul.-set. 2006. tab
Artigo em Português | LILACS | ID: lil-446358

RESUMO

Neste trabalho foi realizado um levantamento bibliográfico etnobotânico sobre plantas utilizadas pela população brasileira no tratamento de sinais e sintomas relacionados às infecções fúngicas. Foram citadas 409 espécies, distribuídas em 98 famílias, com maior concentração em Fabaceae e Asteraceae. Para as dez espécies mais citadas, foi realizada uma busca relativa a estudos de atividade antifúngica na base de dados MEDLINE-PubMed. Somente foram encontrados estudos para Phytolacca americana L., Rosmarinus officinalis L., Mirabilis jalapa L., Schinus molle L. Entre as dez espécies mais utilizadas, seis correspondem a espécies nativas: Anacardium occidentale L., Cecropia peltata L., Schinus molle L., Schinus terebinthinfolius Raddi, Stryphnodendron adstringens (Mart.) Coville e Tabebuia heptaphylla (Vell.) Toledo.


The aim of this work was to draw up a list of plants used by Brazilian population for the treatment of signs and symptoms related to fungal infections and to verify the existence of scientific data related to the antifungal activity in the databasis MEDLINE-PubMed. Four hundread and nine species were listed, which are distributed in ninety eight families, mainly Fabaceae and Asteraceae. Among the more frequently mentioned species (10), only four were evaluated regarding to the antifungal activity: Phytolacca americana L., Rosmarinus officinalis L., Mirabilis jalapa L. and Schinus molle L. From those ten species, six are native (Anacardium occidentale L., Cecropia peltata L., Schinus molle L., Schinus terebinthifolius Raddi, Stryphnodendron adstringens (Mart.) Coville e Tabebuia heptaphylla (Vell.) Toledo.


Assuntos
Asteraceae , Antifúngicos , Fabaceae , Medicina Tradicional , Micoses , Plantas Medicinais , Coleta de Dados , Etnobotânica
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