RESUMO
Rocky outcrop environments at high altitudes have nutrient-poor soil, where species are exposed to water scarcity and high solar radiation. Baccharis platypoda DC. occurs in such an environment and has a rigid and transparent secretion that covers the entire inflorescence. We analysed and compared the secretory structures and their chemical composition in female and male inflorescences of B. platypoda, a dioecious species, to explore chemodiversity within this species and assess potential differences between individuals. Our investigation also aims to understand the occurrence of these substances in the genus Baccharis L. Chemical compounds and secretory structures were similar in female and male inflorescences. There are glandular trichomes on the epidermis of the abaxial surface of bracts, and secretory ducts in the axis of the inflorescence, as well as in sepals, petals, and bracts. Histochemical tests were positive for phenolic compounds, flavonoids, proteins, pectin, and lipids, but not for mucilage. Flavonoid content varied between 6.24% and 9.81%, being higher in female inflorescences. Chromatography revealed the presence of several phenolic compounds, some terpenes, and other less frequent classes in both female and male inflorescences. We highlight that trichomes found on these surfaces produce abundant phenolic compounds. These act as natural defence agents, absorbing UV radiation and minimizing oxidative stress to plant cells. The chemical composition of the secretion covering the inflorescences may reflect adaptation and survival mechanisms of these organisms under extreme sun exposure.
RESUMO
6-Nitrodopamine is a novel catecholamine released by vascular tissues, heart, and vas deferens. The aim of this study was to investigate whether 6-nitrodopamine is released from the thoracic aorta and pulmonary artery rings of marmosets (Callithrix spp.) and to evaluate the relaxing and anti-contractile actions of this catecholamine. Release of 6-nitrodopamine, dopamine, noradrenaline, and adrenaline was assessed by liquid chromatography with tandem mass spectrometry (LC-MS/MS). The relaxations induced by 6-nitrodopamine and by the selective dopamine D2 receptor antagonist L-741,626 were evaluated on U-46619 (3 nM)-pre-contracted vessels. The effects of 6-nitrodopamine and L-741,626 on the contractions induced by electric-field stimulation (EFS), dopamine, noradrenaline, and adrenaline were also investigated. Both aorta and pulmonary artery rings exhibited endothelium-dependent release of 6-nitrodopamine, which was significantly reduced by the NO synthesis inhibitor L-NAME. Addition of 6-nitrodopamine or L-741,626 caused concentration-dependent relaxations of both vascular tissues, which were almost abolished by endothelium removal, whereas L-NAME and the soluble guanylate cyclase inhibitor ODQ had no effect on 6-nitrodopamine-induced relaxations. Additionally, pre-incubation with 6-nitrodopamine antagonized the dopamine-induced contractions, without affecting the noradrenaline- and adrenaline-induced contractions. Pre-incubation with L-741,626 antagonized the contractions induced by all catecholamines. The EFS-induced contractions were significantly increased by L-NAME, but unaffected by ODQ. Immunohistochemical assays showed no immunostaining of the neural tissue markers S-100 and calretinin in either vascular tissue. The results indicated that 6-nitrodopamine is the major catecholamine released by marmoset vascular tissues, and it acts as a potent and selective antagonist of dopamine D2-like receptors. 6-nitrodopamine release may be the major mechanism by which NO causes vasodilatation.
Assuntos
Callithrix , Dopamina , Animais , Masculino , Dopamina/farmacologia , Aorta Torácica/fisiologia , NG-Nitroarginina Metil Éster/farmacologia , Artéria Pulmonar , Cromatografia Líquida , Espectrometria de Massas em Tandem , Endotélio , Norepinefrina/farmacologia , Catecolaminas/farmacologia , Epinefrina , Endotélio Vascular , Óxido Nítrico/fisiologiaRESUMO
Resveratrol is a polyphenol found naturally in fruits and plants. Recently, studies in humans and animal models have suggested beneficial properties of this polyphenol, such as improvements to metabolic and lipid profiles, along with antioxidant, anti-inflammatory and anti-proliferative effects. In the urogenital tract (UGT), resveratrol has also been tested clinically and experimentally as a therapeutic drug in several diseases; however, the translational efficacy of resveratrol, especially in UGT, is still a matter of debate. In the present review, we address the pre-clinical efficacy of resveratrol in UGT-related dysfunctions, focusing on lower urinary tract symptoms, non-cancerous prostatic disease (benign prostatic hyperplasia and prostatitis) and erectile dysfunction. In vitro studies indicate that resveratrol reduces inflammatory markers and oxidative stress, and improves endothelial function in UGT organs and cells isolated from humans and animals. Despite displaying low oral bioavailability, in vivo administration of resveratrol largely improves erectile dysfunction, benign prostatic hyperplasia, prostatitis and voiding impairments, as evidenced in different animal models. Resveratrol also acts as a microbiota modulator, which may explain some of its beneficial effects in vivo. In contrast to the large amount of pre-clinical data, there are insufficient clinical trials to establish resveratrol treatment efficacy in human UGT-related diseases. In summary, we provide an overview of the in vivo and in vitro efficacy of resveratrol in animal and human UGT dysfunctions, which may support future clinical trials.
Assuntos
Disfunção Erétil , Sintomas do Trato Urinário Inferior , Hiperplasia Prostática , Prostatite , Masculino , Animais , Humanos , Disfunção Erétil/tratamento farmacológico , Hiperplasia Prostática/tratamento farmacológico , Resveratrol/farmacologia , Resveratrol/uso terapêutico , Prostatite/tratamento farmacológico , Sintomas do Trato Urinário Inferior/tratamento farmacológicoRESUMO
6-Nitrodopamine is a novel catecholamine released by vascular tissues, heart, and vas deferens. The aim of this study was to investigate whether 6-nitrodopamine is released from the thoracic aorta and pulmonary artery rings of marmosets (Callithrix spp.) and to evaluate the relaxing and anti-contractile actions of this catecholamine. Release of 6-nitrodopamine, dopamine, noradrenaline, and adrenaline was assessed by liquid chromatography with tandem mass spectrometry (LC-MS/MS). The relaxations induced by 6-nitrodopamine and by the selective dopamine D2 receptor antagonist L-741,626 were evaluated on U-46619 (3 nM)-pre-contracted vessels. The effects of 6-nitrodopamine and L-741,626 on the contractions induced by electric-field stimulation (EFS), dopamine, noradrenaline, and adrenaline were also investigated. Both aorta and pulmonary artery rings exhibited endothelium-dependent release of 6-nitrodopamine, which was significantly reduced by the NO synthesis inhibitor L-NAME. Addition of 6-nitrodopamine or L-741,626 caused concentration-dependent relaxations of both vascular tissues, which were almost abolished by endothelium removal, whereas L-NAME and the soluble guanylate cyclase inhibitor ODQ had no effect on 6-nitrodopamine-induced relaxations. Additionally, pre-incubation with 6-nitrodopamine antagonized the dopamine-induced contractions, without affecting the noradrenaline- and adrenaline-induced contractions. Pre-incubation with L-741,626 antagonized the contractions induced by all catecholamines. The EFS-induced contractions were significantly increased by L-NAME, but unaffected by ODQ. Immunohistochemical assays showed no immunostaining of the neural tissue markers S-100 and calretinin in either vascular tissue. The results indicated that 6-nitrodopamine is the major catecholamine released by marmoset vascular tissues, and it acts as a potent and selective antagonist of dopamine D2-like receptors. 6-nitrodopamine release may be the major mechanism by which NO causes vasodilatation.
RESUMO
The aim of this study was to monitor the volatile chemical composition from leaves and reproductive organs of Piper mollicomum Kunth (PM), in its reproduction period, as well as register inflorescence visitors, microclimate and phenological information. The essential oils (EOs) obtained from the different fresh organs by hydrodistillation were identified and quantified by Gas Chromatography/Mass Spectrometry (GC/MS) and by GC coupled to a Flame Ionization Detector (GC/FID), respectively. The cercentage content of some volatiles present in reproductive organs, such as limonene, 1,8-cineole, linalool and eupatoriochromene, increased during the maturation period of the inflorescences, and decreased during the fruiting period, suggesting a defense/attraction activities. Furtermore, a biosynthetic dichotomy between 1,8-cineole (leaves) and linalool (reproductive organs) was recorded. A high frequency of bee visits was registered weekly, and some correlations showed a positive relationship between this variable and terpenes. Microclimate has an impact on this species' phenological cycles and insect visiting behavior. All correlations between volatiles, insects, phenology and microclimate allowed us to present important data about the complex information network in PM. These results are extremely relevant for the understanding of the mechanisms of chemical-ecological plant-insect interactions in Piperaceae, a basal angiosperm.
RESUMO
The aromatic species Piper gaudichaudianum Kunth (Piperaceae) is widely used in Brazil for medicinal and ritualistic applications. In the current study, chemophenetic patterns were realized across season and circadian rhythm based on the chemical profile of essential oils (EOs) from leaves. Hydrodistilled essential oils were analyzed by GC-MS and GC-FID, and a new calculation of metabolite oxidation level, averaged for each individual molecule component of the EO, was used to explore the patterns of metabolism/biosynthesis. This new index used an intermediate calculation, the 'weighted average redox standard' (SRO), to enable a value for mixtures of metabolites to be generated, the 'general mixture redox index' (GMOR). The indices were subjected to a proof-of-concept approach by making comparison to outcomes from multivariate analyses, i.e., PCA and HCA. Chemical analysis demonstrated that the essential oils were dominated by sesquiterpenes, constructed of 15 classes of compound (C-skeletons), and 4 C-skeletons were recognized in the monoterpene group, giving a total of 19. The variation of chemical profiles was distinct at different phenological stages, but stronger chemical variation was evident between day and night as compared to season. Furthermore, due to comprehensive sampling across different regions, nine chemotypes were recognized, including those previously reported. The SRO and GMRO indices demonstrate that phenological variation of chemistry is mainly an outcome of redox fluctuations in terpene biosynthesis, changing from day to night. These indices also corroborate that chemical diversity is increased with oxidative metabolism. Lastly, the current study demonstrates pronounced phenotypic plasticity in P. gaudichaudianum, which makes it a suitable candidate to help further our understanding of chemophenetics and chemical ecology.
RESUMO
BACKGROUND: Differentiation of bone marrow eosinophils (BM-EO) and its trafficking to peripheral blood and respiratory mucosa are a hallmark of inflammatory diseases. Staphylococcal enterotoxin B (SEB) has been shown to aggravate airways eosinophilic inflammation. This study aimed to investigate the effects of mouse airways SEB exposure on BM-EO population, as well as its adhesive properties and release of cytokines/chemokines that orchestrate BM-EO trafficking to lungs. METHODS: Male BALB/c mice were intranasally exposed to SEB (1 µg), and at 4, 16, 24 and 48 h thereafter, bone marrow (BM), circulating blood and bronchoalveolar lavage (BAL) fluid were collected. Levels of cytokines/chemokines and expressions of VLA-4 and CCR3 in BM were evaluated. Adhesion of BM to ICAM-1 and VCAM-1 were also evaluated. RESULTS: SEB exposure promoted a marked eosinophil influx to BAL at 16 and 24 h after exposure, which was accompanied by significant increases in counts of immature (16 h) and mature (4 to 48 h) forms of eosinophil in BM, along with blood eosinophilia (16 h). In BM, higher levels of eotaxin, IL-5, IL-4, IL-3 and IL-7 were detected at 16 to 48 h. SEB also significantly increased CCR3 expression and calcium levels in BM-EO, and enhanced the cell adhesion to ICAM-1 (24 h) and ICAM-1 (48 h). CONCLUSION: Airways SEB exposure increases the number of eosinophils in BM by mechanisms involving a network of cytokine and chemokine release, facilitating the BM-EO adhesion to ICAM-1 and VCAM-1 to gain access to the peripheral blood and lung tissues.
Assuntos
Administração Intranasal/métodos , Medula Óssea/metabolismo , Enterotoxinas/metabolismo , Eosinófilos/metabolismo , Pulmão/metabolismo , Absorção Nasal/fisiologia , Animais , Medula Óssea/microbiologia , Líquido da Lavagem Broncoalveolar/microbiologia , Enterotoxinas/administração & dosagem , Enterotoxinas/sangue , Eosinófilos/microbiologia , Pulmão/microbiologia , Masculino , Camundongos , Camundongos Endogâmicos BALB C , Staphylococcus aureus/metabolismoRESUMO
Aminas bioativas vêm, ao longo dos anos, despertando o interesse dos pesquisadores no que se refere aos benefícios e aos prejuízos da sua presença ou mesmo do seu uso intencional, principalmente na alimentação de aves de corte, refletindo posteriormente na qualidade da carne produzida pelas mesmas. A presença de determinadas aminas em rações de aves de corte pode beneficiar e acelerar o desenvolvimento das mesmas, no entanto, quando presente em níveis elevados pode retardar o crescimento, causar disfunções metabólicas ou mesmo a morte dos animais. Estudos vêm sendo realizados a fim de definir quantidades ideais e tipos de aminas a ser adicionada à dieta a fim de propiciar um desenvolvimento adequado às aves sem, no entanto, apresentar resíduos na carne das mesmas.
Assuntos
Animais , Aves Domésticas/crescimento & desenvolvimento , Aminas Biogênicas/análise , Ração Animal/análise , Produtos Avícolas/análise , Aminas Biogênicas/administração & dosagem , Literatura de Revisão como Assunto , Análise de AlimentosRESUMO
Aminas bioativas vêm, ao longo dos anos, despertando o interesse dos pesquisadores no que se refere aos benefícios e aos prejuízos da sua presença ou mesmo do seu uso intencional, principalmente na alimentação de aves de corte, refletindo posteriormente na qualidade da carne produzida pelas mesmas. A presença de determinadas aminas em rações de aves de corte pode beneficiar e acelerar o desenvolvimento das mesmas, no entanto, quando presente em níveis elevados pode retardar o crescimento, causar disfunções metabólicas ou mesmo a morte dos animais. Estudos vêm sendo realizados a fim de definir quantidades ideais e tipos de aminas a ser adicionada à dieta a fim de propiciar um desenvolvimento adequado às aves sem, no entanto, apresentar resíduos na carne das mesmas.(AU)
Bioactive amines have, over the years, attracting the interest of researchers in relation to the benefits and harms of their presence or even their intentional use, especially in feeding broilers, later reflecting on the quality of meat produced by them. The presence of certain amines in diets of broilers can benefit and accelerate their development. However, when present at high levels may retard growth, cause metabolic dysfunction or death of the animals. Studies have been conducted to define optimal amounts and types of amines to be added to the diet in order to provide adequate support for poultry development without, however, presenting the same residues in meat.(AU)
Assuntos
Aminas , Carne/análise , Contaminação de Alimentos/análise , Ração Animal/toxicidade , Galinhas/metabolismoRESUMO
LINKED ARTICLE: This article is commented on by Michel, M. C., pp. 429-430 of this issue. To view this commentary visit http://dx.doi.org/10.1111/bph.13379. BACKGROUND AND PURPOSE: Mirabegron is the first ß3 -adrenoceptor agonist approved for treatment of overactive bladder syndrome. This study aimed to investigate the effects of ß3 -adrenoceptor agonist mirabegron in mouse urethra. The possibility that mirabegron also exerts α1 -adrenoceptor antagonism was also tested in rat smooth muscle preparations presenting α1A - (vas deferens and prostate), α1D - (aorta) and α1B -adrenoceptors (spleen). EXPERIMENTAL APPROACH: Functional assays were carried out in mouse and rat isolated tissues. Competition assays for the specific binding of [(3) H]prazosin to membrane preparations of HEK-293 cells expressing each of the human α1 -adrenoceptors, as well as ß-adrenoceptor mRNA expression and cyclic AMP measurements in mouse urethra, were performed. KEY RESULTS: Mirabegron produced concentration-dependent urethral relaxations that were shifted to the right by the selective ß3 -adrenoceptor antagonist L-748,337 but unaffected by ß1 - and ß2 -adrenoceptor antagonists (atenolol and ICI-118,551 respectively). Mirabegron-induced relaxations were enhanced by the PDE4 inhibitor rolipram, and the agonist stimulated cAMP synthesis. Mirabegron also produced rightward shifts in urethral contractions induced by the α1 -adrenoceptor agonist phenylephrine. Schild regression analysis revealed that mirabegron behaves as a competitive antagonist of α1 -adrenoceptors in urethra, vas deferens and prostate (α1A -adrenoceptor, pA2 â 5.6) and aorta (α1D -adrenoceptor, pA2 â 5.4) but not in spleen (α1B -adrenoceptor). The affinities estimated for mirabegron in functional assays were consistent with those estimated in radioligand binding with human recombinant α1A - and α1D -adrenoceptors (pKi â 6.0). CONCLUSION AND IMPLICATIONS: The effects of mirabegron in urethral smooth muscle are the result of ß3 -adrenoceptor agonism together with α1A and α1D -adrenoceptor antagonism.
Assuntos
Acetanilidas/farmacologia , Antagonistas de Receptores Adrenérgicos alfa 1/farmacologia , Agonistas de Receptores Adrenérgicos beta 3/farmacologia , Tiazóis/farmacologia , Uretra/efeitos dos fármacos , Aminofenóis/farmacologia , Animais , Aorta Torácica/efeitos dos fármacos , Aorta Torácica/fisiologia , Células HEK293 , Humanos , Técnicas In Vitro , Masculino , Camundongos Endogâmicos C57BL , Relaxamento Muscular/efeitos dos fármacos , Relaxamento Muscular/fisiologia , Músculo Liso/efeitos dos fármacos , Músculo Liso/fisiologia , Próstata/efeitos dos fármacos , Próstata/fisiologia , Ratos Wistar , Receptores Adrenérgicos alfa/genética , Receptores Adrenérgicos alfa/fisiologia , Baço/efeitos dos fármacos , Baço/fisiologia , Sulfonamidas/farmacologia , Uretra/fisiologia , Ducto Deferente/efeitos dos fármacos , Ducto Deferente/fisiologiaRESUMO
Pulmonary neutrophil infiltration produced by Staphylococcal enterotoxin A (SEA) airway exposure is accompanied by marked granulocyte accumulation in bone marrow (BM). Therefore, the aim of this study was to investigate the mechanisms of BM cell accumulation, and trafficking to circulating blood and lung tissue after SEA airway exposure. Male BALB/C mice were intranasally exposed to SEA (1µg), and at 4, 12 and 24h thereafter, BM, circulating blood, bronchoalveolar lavage (BAL) fluid and lung tissue were collected. Adhesion of BM granulocytes and flow cytometry for MAC-1, LFA1-α and VLA-4 and cytokine and/or chemokine levels were assayed after SEA-airway exposure. Prior exposure to SEA promoted a marked PMN influx to BAL and lung tissue, which was accompanied by increased counts of immature and/or mature neutrophils and eosinophils in BM, along with blood neutrophilia. Airway exposure to SEA enhanced BM neutrophil MAC-1 expression, and adhesion to VCAM-1 and/or ICAM-1-coated plates. Elevated levels of GM-CSF, G-CSF, INF-γ, TNF-α, KC/CXCL-1 and SDF-1α were detected in BM after SEA exposure. SEA exposure increased production of eosinopoietic cytokines (eotaxin and IL-5) and BM eosinophil VLA-4 expression, but it failed to affect eosinophil adhesion to VCAM-1 and ICAM-1. In conclusion, BM neutrophil accumulation after SEA exposure takes place by integrated action of cytokines and/or chemokines, enhancing the adhesive responses of BM neutrophils and its trafficking to lung tissues, leading to acute lung injury. BM eosinophil accumulation in SEA-induced acute lung injury may occur via increased eosinopoietic cytokines and VLA-4 expression.
Assuntos
Lesão Pulmonar Aguda/imunologia , Células da Medula Óssea/imunologia , Quimiotaxia de Leucócito , Enterotoxinas , Pulmão/imunologia , Infiltração de Neutrófilos , Neutrófilos/imunologia , Pneumonia/imunologia , Lesão Pulmonar Aguda/induzido quimicamente , Lesão Pulmonar Aguda/metabolismo , Lesão Pulmonar Aguda/patologia , Animais , Células da Medula Óssea/metabolismo , Líquido da Lavagem Broncoalveolar/citologia , Líquido da Lavagem Broncoalveolar/imunologia , Adesão Celular , Moléculas de Adesão Celular/imunologia , Moléculas de Adesão Celular/metabolismo , Citocinas/imunologia , Citocinas/metabolismo , Mediadores da Inflamação/imunologia , Mediadores da Inflamação/metabolismo , Pulmão/metabolismo , Pulmão/patologia , Masculino , Camundongos Endogâmicos BALB C , Neutrófilos/metabolismo , Pneumonia/induzido quimicamente , Pneumonia/metabolismo , Pneumonia/patologia , Transdução de Sinais , Fatores de TempoAssuntos
Humanos , Bovinos , Carne/análise , Cruzamento/métodos , Qualidade dos Alimentos , Aumento de Peso , Criação de Animais Domésticos , BrasilRESUMO
Com o objetivo de avaliar o ganho de peso, o rendimento, a tipificação e os componentes não integrantes de carcaças de diferentes cruzamentos entre bovinos de corte, foram avaliados 55 bovinos machos inteiros em uma fazenda localizada no município de ltacarambi, Norte de Minas Gerais, sendo nove animais da raça Nelore (NE), dez Y2 sangue Pardo Suíço-Nelore (PN), dez Y2 sangue Limousin-Nelore (LN), nove Y2 sangue Tabapuã- Nelore (TN), sete Y2 sangue Simental-Nelore (SN) e dez % sangue Nelore-Red Angus (NR) com pesos iniciais de 200, 236, 231,5, 189, 213,38 e 187 kg, respectivamente, todos criados a pasto. Pesagens em jejum no início (202 ± 19 dias de idade) e término do experimento (712 ± 19 dias) permitiram os cálculos de ganho de peso médio diário (GPMD). Ao abate foram pesados a carcaça e os componentes não carcaça e calculado o rendimento de carcaça. As carcaças foram tipificadas conforme os parâmetros normatizados pela Portaria n° 612, de 05 de outubro de 1989. O GPMD e o peso ao abate foram maiores para os LN (512,74 g e 721 kg), PN (504,90 g e 717 kg) e SN (507,56 g e 721 kg). Os animais LN apresentaram maior rendimento de carcaça (53,87 %) e os componentes couro, cabeça + língua, mocotó e o trato-gastrointestinal foram os itens que mais interferiram nesse resultado. Conclui-se que o melhor grupo genético avaliado é o cruzamento industrial Limousin- Nelore. (AU)
In order to assess weight gain, income, classification and components not members of carcass of different crossbreeding between beef cattle, were evaluated 55 cattle bulls on a farm in the municipality of ltacarambi, North of Minas Gerais. Nine Nelore (NE), ten 'h blood Nelore-Braunvieh (PN), ten 'h blood Nelore-Limousin (LN) , nine lh blood Tabapuã-Nelore (TN), seven 'h blood Simmental-Nelore (SN) and ten .3J,t blood Nelore-Red Angus (NR) weightings at lhe beginning 200, 236, 231,5, 189, 213,38 e 187 kg, respectively, all raised on pasture. Weightings fasted on the beginning (202 ± 19 days of age) and end of the experiment (712 ± 19 days) allowed the calculation of average daily weight gain (DWG). At slaughter the body parts were weighed and calculated carcass yield. The carcasses were graded according to standardized parameters by Ordinance No. 612 of October 5, 1989. The DWG and weight at slaughter were higher for LN (512.74 g and 721 kg), PN (504.90 g and 717 kg) and SN (507.56 g and 721 kg). LN animals had higher carcass yield (53.87%) and the components leather, head + language, feet and gastrointestinal tract - were the items that mostly affected this result. It is concluded that the best genetic group evaluated is the industrial crossbreeding Limousin- Nellore. (AU)
Assuntos
Humanos , Bovinos , Carne/análise , Qualidade dos Alimentos , Cruzamento/métodos , Aumento de Peso , Criação de Animais Domésticos , BrasilRESUMO
BACKGROUND: Nitric oxide is a key signalling molecule in the pathogenesis of inflammation, but its role in acute pancreatitis and related abdominal pain induced by secretory phospholipase A2 (sPLA2 ) from Crotalus durissus terrificus (Cdt) venom has not been investigated. METHODS: Male Wistar rats were i.v. injected with L-NAME (20 mg/kg), aminoguanidine (AG, 50 mg/kg), 7-nitroindazole (7-NI, 10 mg/kg) or vehicle 10 min before or 60 min after the injection of sPLA2 (300 µg/kg) into the common bile duct. After 4 h of sPLA2 injection, abdominal hyperalgesia and inflammation were assessed in addition to serum amylase, nitrite/nitrate (NOx), pancreas lipoperoxidation and 3-nitrotyrosine (3-NT) contents. RESULTS: sPLA2 -induced acute pancreatitis, related abdominal hyperalgesia, hyperamylasemia and increased concentration of NOx were not correlated with lipoperoxidation or increased 3-NT in the pancreas. Pretreatment with all the nitric oxide synthase (NOS) inhibitors significantly reduced abdominal mechanical hyperalgesia, but only iNOS blockade by AG suppressed pancreas oedema and serum NOx increase. The therapeutic approach with all the NOS inhibitors produced a similar reduction pattern of the abdominal hyperalgesia, but AG treatment also inhibited serum hyperamylasemia and NOx concentrations and pancreatic myeloperoxidase. The nNOS blockade by 7-NI treatment also inhibited myeloperoxidase activity in both pancreas and lung. CONCLUSIONS: Therapeutic blockade of iNOS or nNOS provides benefits in terms of inhibition of the acute pancreatitis-related abdominal hyperalgesia, while iNOS inhibition also ameliorates the inflammatory cell influx to the pancreas and reduces the resultant hyperamylasemia and NOx levels, thus representing alternative pharmacological strategies for treatment of clinical pancreatitis associated with increased PLA2 .
Assuntos
Inibidores Enzimáticos/uso terapêutico , NG-Nitroarginina Metil Éster/uso terapêutico , Óxido Nítrico Sintase Tipo II/antagonistas & inibidores , Dor/tratamento farmacológico , Dor/etiologia , Pancreatite/complicações , Pancreatite/tratamento farmacológico , Fosfolipases A2 Secretórias , Animais , Hiperalgesia/induzido quimicamente , Hiperalgesia/tratamento farmacológico , Masculino , Pâncreas/enzimologia , Pâncreas/patologia , Pancreatite/enzimologia , Peroxidase/metabolismo , Ratos , Ratos Wistar , Substâncias Reativas com Ácido Tiobarbitúrico/metabolismo , Tirosina/análogos & derivados , Tirosina/metabolismoRESUMO
Phosphodiesterase-9 (PDE9) specifically hydrolyzes cyclic GMP, and was detected in human corpus cavernosum. However, no previous studies explored the selective PDE9 inhibition with BAY 73-6691 in corpus cavernosum relaxations. Therefore, this study aimed to characterize the PDE9 mRNA expression in mice corpus cavernosum, and investigate the effects of BAY 73-6691 in endothelium-dependent and -independent relaxations, along with the nitrergic corpus cavernosum relaxations. Male mice received daily gavage of BAY 73-6691 (or dimethylsulfoxide) at 3 mg kg(-1) per day for 21 days. Relaxant responses to acetylcholine (ACh), nitric oxide (NO) (as acidified sodium nitrite; NaNO2 solution), sildenafil and electrical-field stimulation (EFS) were obtained in corpus cavernosum in control and BAY 73-6691-treated mice. BAY 73-6691 was also added in vitro 30 min before construction of concentration-responses and frequency curves. PDE9A and PDE5 mRNA expression was detected in the mice corpus cavernosum in a similar manner. In vitro addition of BAY 73-6691 neither itself relaxed mice corpus cavernosum nor changed the NaNO2, sildenafil and EFS-induced relaxations. However, in mice treated chronically with BAY 73-6691, the potency (pEC50) values for ACh, NaNO2 and sildenafil were significantly greater compared with control group. The maximal responses (Emax) to NaNO2 and sildenafil were also significantly greater in BAY 73-6691-treated mice. BAY 73-6691 treatment also significantly increased the magnitude and duration of the nitrergic corpus cavernosum relaxations (8-32 Hz). In conclusion, murine corpus cavernosum expresses PDE9 mRNA. Prolonged PDE9 inhibition with BAY 73-6691 amplifies the NO-cGMP-mediated cavernosal responses, and may be of therapeutic value for erectile dysfunction.
Assuntos
3',5'-AMP Cíclico Fosfodiesterases/antagonistas & inibidores , GMP Cíclico/fisiologia , Óxido Nítrico/fisiologia , Pênis/enzimologia , Pênis/fisiologia , Pirazóis/farmacologia , Pirimidinas/farmacologia , 3',5'-AMP Cíclico Fosfodiesterases/genética , 3',5'-AMP Cíclico Fosfodiesterases/fisiologia , Animais , Nucleotídeo Cíclico Fosfodiesterase do Tipo 5/genética , Estimulação Elétrica , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Relaxamento Muscular/efeitos dos fármacos , Óxido Nítrico/farmacologia , Inibidores de Fosfodiesterase/farmacologia , Piperazinas/farmacologia , Purinas/farmacologia , RNA Mensageiro/análise , Transdução de Sinais/efeitos dos fármacos , Citrato de Sildenafila , Sulfonas/farmacologiaRESUMO
A basic phospholipase A2 (LmrTX) isoform was isolated from Lachesis muta rhombeata snake venom and partially characterized. The venom was fractionated by molecular exclusion chromatography in ammonium bicarbonate buffer followed by reverse-phase HPLC on a C-5 Discovery® Bio Wide column. From liquid chromatography-electrospray ionization/mass spectrometry, the molecular mass of LmrTX was measured as 14.277.50 Da. The amino acid sequence showed a high degree of homology between PLA2 LmrTX from L. muta rhombeata and other PLA2 from snake venoms, like CB1 and CB2 from Crotalus durissus terrificus; LmTX-I and LmTX-II from Lachesis muta muta. LmrTX had PLA2 activity in the presence of a synthetic substrate and alkylation of histidine residues significantly inhibited (P < 0.05) the enzymatic activity of LmrTX and its anticoagulant and antithrombotic activity. In this study, we examined the ability of the LmrTX in altering thrombus formation in living mouse, using a photochemically induced arterial thrombosis model. The control animals that did not receive protein injection showed a normal occlusion time, which was around 57 ± 7.8 min. LmrTX, the PLA2 from L. muta rhombeata venom, caused a change in the occlusion time to 99 ± 10 min with doses of 7.5 µg/mice. Additionally, LmrTX showed the anticoagulant activity in vitro and ex vivo and prolonging the time aggregation in wash platelet induced by ADP and Thrombin.
Assuntos
Venenos de Crotalídeos/enzimologia , Fosfolipases A2/genética , Fosfolipases A2/metabolismo , Trombose/induzido quimicamente , Sequência de Aminoácidos , Animais , Sequência de Bases , Cromatografia em Gel , Cromatografia Líquida de Alta Pressão , Cromatografia Líquida , Espectrometria de Massas , Camundongos , Dados de Sequência Molecular , Análise de Sequência de DNA , Especificidade da EspécieRESUMO
The nitric oxide-cGMP signaling pathway modulates the ejaculatory functions. The nitric oxide (NO)-independent soluble guanylate cyclase haem-dependent stimulator BAY 41-2272 potently relaxes different types of smooth muscles. However, no study investigated its effects in vas deferens smooth muscle. Therefore, we designed experiments to evaluate the in vitro relaxing responses of vas deferens to BAY 41-2272. The effects of prolonged oral intake with BAY 41-2272 in vas deferens contractions of rats treated chronically with the NO synthase inhibitor N(ω)-nitro-L-arginine methyl ester (L-NAME) were also investigated. BAY 41-2272 (0.001-100 µM) produced concentration-dependent relaxations in the prostatic and epididymal portions of vas deferens, an effect markedly reduced by the soluble guanylate cyclase inhibitor ODQ (100 µM). BAY 41-2272 significantly increased cGMP levels that were fully prevented by ODQ. In separate protocols, rats received L-NAME (20mg/rat/day) concomitantly with BAY 41-2272 (10mg/kg/day, 4 weeks), after which vas deferens contractions to electrical-field stimulation and noradrenaline were achieved. Electrical-field stimulation (1-32 Hz) evoked frequency-dependent contractions that were significantly enhanced in L-NAME-treated rats. Co-treatment with BAY 41-2272 fully reversed the increased contractile responses in L-NAME group. Noradrenaline (0.01-100 µM)-induced contractions were also greater in L-NAME-treated rats, and that was normalized by BAY 41-2272. In conclusion, BAY 41-2272 potently relaxes in vitro rat vas deferens smooth muscle and elevates the cGMP levels in an ODQ-sensitive manner. Moreover, prolonged oral intake with BAY 41-2272 restores the enhanced contractile vas deferens activity in rats treated with L-NAME. NO-independent soluble guanylate cyclase stimulators may be an alternative treatment for premature ejaculation.
Assuntos
Músculo Liso/efeitos dos fármacos , Músculo Liso/fisiologia , Pirazóis/farmacologia , Piridinas/farmacologia , Receptores Citoplasmáticos e Nucleares/agonistas , Ducto Deferente/efeitos dos fármacos , Ducto Deferente/fisiologia , Animais , GMP Cíclico/biossíntese , Estimulação Elétrica , Guanilato Ciclase , Técnicas In Vitro , Masculino , Contração Muscular/efeitos dos fármacos , Músculo Liso/metabolismo , Óxido Nítrico/metabolismo , Norepinefrina/farmacologia , Ratos , Ratos Wistar , Guanilil Ciclase Solúvel , Fatores de Tempo , Ducto Deferente/metabolismoRESUMO
BACKGROUND AND PURPOSE: Phagocyte function is critical for host defense against infections. Defects in phagocytic function lead to several primary immunodeficiencies characterized by early onset of recurrent and severe infections. In this work, we further investigated the effects of BAY 41-2272, a soluble guanylate cyclase (sGC) agonist, on the activation of human peripheral blood monocytes (PBM) and THP-1 cells. EXPERIMENTAL APPROACH: THP-1 cells and PBM viability was evaluated by methylthiazoletetrazolium assay; reactive oxygen species production by lucigenin chemiluminescence; gene and protein expression of NAPDH oxidase components by qRT-PCR and Western blot analysis, respectively; phagocytosis and microbicidal activity by co-incubation, respectively, with zymosan and Escherichia coli; and cytokine release by elisa. KEY RESULTS: BAY 41-2272, compared with the untreated group, increased spreading of monocytes by at least 35%, superoxide production by at least 50%, and gp91(PHOX) and p67(PHOX) gene expression 20 to 40 times, in both PBM and THP-1 cells. BAY 41-2272 also augmented phagocytosis of zymosan particles threefold compared with control, doubled microbicidal activity against E. coli and enhanced the release of TNF-α and IL-12p70 by both PBM and THP-1 cells. Finally, by inhibiting sGC with ODQ, we showed that BAY 41-2272-induced superoxide production and phagocytosis is not dependent exclusively on sGC activation. CONCLUSIONS AND IMPLICATIONS: In addition to its ability to induce vasorelaxation and its potential application for therapy of vascular diseases, BAY 41-2272 was shown to activate human mononuclear phagocytes. Hence, it is a novel pro-inflammatory drug that may be useful for controlling infections in the immunocompromised host.
Assuntos
Guanilato Ciclase/metabolismo , Monócitos/efeitos dos fármacos , Pirazóis/farmacologia , Piridinas/farmacologia , Linhagem Celular , Sobrevivência Celular/efeitos dos fármacos , Células Cultivadas , Escherichia coli/efeitos dos fármacos , Humanos , Interleucina-12/metabolismo , Glicoproteínas de Membrana/genética , Glicoproteínas de Membrana/metabolismo , Monócitos/fisiologia , NADPH Oxidase 2 , NADPH Oxidases/genética , NADPH Oxidases/metabolismo , Fagocitose/efeitos dos fármacos , Fosfoproteínas/metabolismo , RNA Mensageiro/metabolismo , Superóxidos/metabolismo , Fator de Necrose Tumoral alfa/metabolismoRESUMO
BACKGROUND AND PURPOSE: Diabetic cystopathy is one of the most common and incapacitating complications of diabetes mellitus. This study aimed to evaluate the functional, structural and molecular alterations of detrusor smooth muscle (DSM) in streptozotocin-induced diabetic mice, focusing on the contribution of Ca(2+) influx through L-type voltage-operated Ca(2+) channels (L-VOCC). EXPERIMENTAL APPROACH: Male C57BL/6 mice were injected with streptozotocin (125 mg·kg(-1) ). Four weeks later, contractile responses to carbachol, α,ß-methylene ATP, KCl, extracellular Ca(2+) and electrical-field stimulation were measured in urothelium-intact DSM strips. Cystometry and histomorphometry were performed, and mRNA expression for muscarinic M(2) /M(3) receptors, purine P2X1 receptors and L-VOCC in the bladder was determined. KEY RESULTS: Diabetic mice exhibited higher bladder capacity, frequency, non-void contractions and post-void pressure. Increased bladder weight, wall thickness, bladder volume and neural tissue were observed in diabetic bladders. Carbachol, α,ß-methylene ATP, KCl, extracellular Ca(2+) and electrical-field stimulation all produced greater DSM contractions in diabetic mice. The L-VOCC blocker nifedipine almost completely reversed the enhanced DSM contractions in bladders from diabetic animals. The Rho-kinase inhibitor Y27632 had no effect on the enhanced carbachol contractions in the diabetic group. Expression of mRNA for muscarinic M(3) receptors and L-VOCC were greater in the bladders of diabetic mice, whereas levels of M(2) and P2X1 receptors remained unchanged. CONCLUSIONS AND IMPLICATIONS: Diabetic mice exhibit features of urinary bladder dysfunction, as characterized by overactive DSM and decreased voiding efficiency. Functional and molecular data suggest that overactive DSM in diabetes is the result of enhanced extracellular Ca(2+) influx through L-VOCC.
Assuntos
Canais de Cálcio Tipo L/metabolismo , Diabetes Mellitus Experimental/complicações , Doenças da Bexiga Urinária/etiologia , Amidas/farmacologia , Animais , Bloqueadores dos Canais de Cálcio/farmacologia , Cloreto de Cálcio/farmacologia , Carbacol/farmacologia , Agonistas Colinérgicos/farmacologia , Inibidores Enzimáticos/farmacologia , Regulação da Expressão Gênica/fisiologia , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Nifedipino/farmacologia , Piridinas/farmacologia , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , Receptor Muscarínico M2/genética , Receptor Muscarínico M2/metabolismo , Receptor Muscarínico M3/genética , Receptor Muscarínico M3/metabolismo , Receptores Purinérgicos P2X1/genética , Receptores Purinérgicos P2X1/metabolismo , Doenças da Bexiga Urinária/patologia , Quinases Associadas a rho/metabolismoRESUMO
Composite of multi-walled carbon nanotubes (MWCNT) and epoxy resin DGEBA were obtained with DDM hardener. The MWCNT were synthesized with length of millimeters by camphor/ferrocene pyrolysis. Different cure temperatures of DGEBA/DDM with addition of up to 1% MWCNT were studied to evaluate eventual changes in cure kinetics by differential scanning calorimetry (DSC). No change was detected in glass transition temperature with insertion of MWCNT although the cure enthalpy has been reduced.