Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 566
Filtrar
Mais filtros

Intervalo de ano de publicação
1.
BMC Cardiovasc Disord ; 23(1): 85, 2023 02 12.
Artigo em Inglês | MEDLINE | ID: mdl-36774496

RESUMO

OBJECTIVES: The right heart is mainly supplied with blood by the right coronary artery (RCA). The impact of RCA chronic total occlusion (CTO) on the function of the right heart [right atrium (RA) and ventricle (RV)] and whether successful recanalization of a RCA CTO improves the function of the right heart is not clearly understood yet. We aimed to evaluate right atrial function after recanalization of the RCA using transthoracic echocardiography with additional strain imaging. METHODS AND RESULTS: Fifty-five patients undergoing RCA CTO recanalization at the University Medical Center of Mainz were included in the study. Right atrial strain was assessed before and 6 months after successful CTO revascularization. The median age of the total collective was 66 (50-90) years. We did not find difference in our analysis of RA Volume (p 0.086), RA area (p 0.093), RA major dimension (p 0.32) and RA minor dimension (p 0.139) at baseline and follow-up. Mean RA reservoir strain at baseline was 30.9% (21.1-43.0) vs. 33.4% (20.7-47.7) at follow up (p < 0.001). Mean RA conduit strain was - 17.5% (- 10.7-(- 29.7)) at baseline vs. - 18.2% (- 9.6-(- 31.7)) at follow-up (p = 0.346). Mean RA contraction strain was - 12.9% (- 8.0- (- 21.3)) at baseline vs. - 15.5% (- 8.7-(- 26.6)) at follow-up (p < 0.001). CONCLUSION: Right atrial function was altered in patients with RCA CTO. Successful revascularisation of an RCA CTO improved RA function assessed by strain imaging at follow-up.


Assuntos
Oclusão Coronária , Intervenção Coronária Percutânea , Humanos , Idoso , Idoso de 80 Anos ou mais , Função do Átrio Direito , Doença Crônica , Oclusão Coronária/diagnóstico por imagem , Oclusão Coronária/terapia , Ecocardiografia , Vasos Coronários , Intervenção Coronária Percutânea/efeitos adversos , Resultado do Tratamento
2.
Arch Insect Biochem Physiol ; 113(3): e22014, 2023 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-37032458

RESUMO

QiufengN is a silkworm strain. During the feeding process of QiufengN, a mutant of black pupal cuticle QiufengNBP was found. Some silkworm pupae of the mutant were unable to easily molt during pupation, and some silkworm eggs produced by developed normally but larvae were unable to break out of the eggshells. These phenomena had not been observed in other black pupa mutants. Genetic analysis showed that the melanization trait of QiufengNBP is controlled by a recessive gene located on the autosome and follows Mendelian inheritance. Results of positional cloning and qRT-PCR showed that the occurrence of black pupae was caused by the mutation of the ebony gene on chromosome 26. 2-DE analysis of the pupal cuticle of QiufengN and QiufengNBP found that the 30K protein, the main storage protein for the growth and development of silkworms and an important energy substance for embryonic development, has changed significantly. In addition, the expression level of Bombyx mori hatching enzyme (BmHEL), which can soften the eggshell during the hatching process of silkworm, was significantly higher in the eggs of black pupae before and after hatching than in normal eggs. The mutation of ebony makes hatching difficult for silkworms, and increases in BmHEL is needed to soften the eggshell. This study showed that ebony may have important effects on the formation of silkworm pigment and egg hatching, and its formation mechanism is complex and deserves further study.


Assuntos
Bombyx , Animais , Bombyx/metabolismo
3.
Biotechnol Lett ; 45(8): 1001-1011, 2023 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-37266881

RESUMO

Current research focuses on the soluble and high-level expression of biologically active recombinant human IL-29 protein in Escherichia coli. The codon-optimized IL-29 gene was cloned into the Champion™ pET SUMO expression system downstream of the SUMO tag under the influence of the T7 lac promoter. The expression of SUMO-fused IL-29 protein was compared in E. coli Rosetta 2(DE3), Rosetta 2(DE3) pLysS, and Rosetta-gami 2(DE3). The release of the SUMO fusion partner resulted in approximately 98 mg of native rhIL-29 protein with a purity of 99% from 1 l of fermentation culture. Purified rhIL-29 was found to be biologically active, as evaluated by its anti-proliferation assay. It was found that Champion™ pET SUMO expression system can be used to obtained high yield of biologically active soluble recombinant human protein compared to other expression vector.


Assuntos
Escherichia coli , Interleucinas , Humanos , Proteínas Recombinantes de Fusão/genética , Proteínas Recombinantes de Fusão/metabolismo , Escherichia coli/genética , Escherichia coli/metabolismo , Proteínas Recombinantes/metabolismo , Interleucinas/genética , Códon
4.
Int J Mol Sci ; 24(14)2023 Jul 14.
Artigo em Inglês | MEDLINE | ID: mdl-37511223

RESUMO

The genome sequencing of the tardigrade Ramazzottius varieornatus revealed a unique nucleosome-binding protein named damage suppressor (Dsup), which was discovered to be crucial for the extraordinary abilities of tardigrades in surviving extreme stresses, such as UV. Evidence in Dsup-transfected human cells suggests that Dsup mediates an overall response in DNA damage signaling, DNA repair, and cell cycle regulation, resulting in an acquired resistance to stress. Given these promising outcomes, our study attempts to provide a wider comprehension of the molecular mechanisms modulated by Dsup in human cells and to explore the Dsup-activated molecular pathways under stress. We performed a differential proteomic analysis of Dsup-transfected and control human cells under basal conditions and at 24 h recovery after exposure to UV-C. We demonstrate via enrichment and network analyses, for the first time, that even in the absence of external stimuli, and more significantly, after stress, Dsup activates mechanisms involved with the unfolded protein response, the mRNA processing and stability, cytoplasmic stress granules, the DNA damage response, and the telomere maintenance. In conclusion, our results shed new light on Dsup-mediated protective mechanisms and increases our knowledge of the molecular machineries of extraordinary protection against UV-C stress.


Assuntos
Proteômica , Tardígrados , Humanos , Animais , Tardígrados/genética , Tardígrados/metabolismo , Dano ao DNA , Reparo do DNA , Mapeamento Cromossômico
5.
J Sci Food Agric ; 103(12): 5819-5830, 2023 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-37092326

RESUMO

BACKGROUND: Snail allergy is rare but can be fatal. Pila polita, a freshwater snail, was considered as a popular exotic food, particularly in tropical countries, and consumed in processed forms. Thus, the purpose of this study was to identify the major and cross-reactive allergens of P. polita and to determine the impact of food processing on the allergen stability. RESULTS: Sodium dodecyl sulfate-polyacrylamide gel electrophoresis fractionated raw snail extract to approximately 24 protein bands, between 9 and 245 kDa. The prominent band at 33 kDa was detected in all raw and processed snail extracts. Immunoblotting tests of the raw extract demonstrated 19 immunoglobulin E (IgE)-binding proteins, and four of them, at 30, 35, 42 and 49 kDa, were revealed as the major IgE-binding proteins of P. polita. Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry identified the 49 and 42 kDa major allergens as actin, whereas the 30 and 35 kDa major allergens were identified as tropomyosin. Immunoblotting revealed that the raw snail had more allergenic proteins than the processed snail. The degree of allergenicity in decreasing order was raw > brine pickled> boiled > roasted > fried > vinegar pickled. The presence of cross-reactivity between P. polita and the shellfish tested was exhibited with either no, complete, or partial inhibitions. CONCLUSION: Actin and tropomyosin were identified as the major and cross-reactive allergens of P. polita among local patients with snail allergy. Those major allergens are highly stable to high temperatures, acidic pH, and high salt, which might played a crucial role in snail allergy in Malaysia. © 2023 Society of Chemical Industry.


Assuntos
Alérgenos , Hipersensibilidade Alimentar , Animais , Humanos , Alérgenos/química , Tropomiosina/química , Actinas , Imunoglobulina E , Caramujos , Manipulação de Alimentos , Eletroforese em Gel de Poliacrilamida , Água Doce , Immunoblotting
6.
Curr Issues Mol Biol ; 44(5): 1768-1787, 2022 Apr 19.
Artigo em Inglês | MEDLINE | ID: mdl-35678651

RESUMO

The ER chaperone calreticulin (CALR) also has extracellular functions and can exit the mammalian cell in response to various factors, although the mechanism by which this takes place is unknown. The yeast Saccharomyces cerevisiae efficiently secretes human CALR, and the analysis of this process in yeast could help to clarify how it gets out of eukaryotic cells. We have achieved a secretion titer of about 140 mg/L CALR in our S. cerevisiae system. Here, we present a comparative quantitative whole proteome study in CALR-secreting yeast using non-equilibrium pH gradient electrophoresis (NEPHGE)-based two-dimensional gel electrophoresis (2DE) as well as liquid chromatography mass spectrometry in data-independent analysis mode (LC-MSE). A reconstructed carrier ampholyte (CA) composition of NEPHGE-based first-dimension separation for 2DE could be used instead of formerly commercially available gels. Using LC-MSE, we identified 1574 proteins, 20 of which exhibited differential expression. The largest group of differentially expressed proteins were structural ribosomal proteins involved in translation. Interestingly, we did not find any signs of cellular stress which is usually observed in recombinant protein-producing yeast, and we did not identify any secretory pathway proteins that exhibited changes in expression. Taken together, high-level secretion of human recombinant CALR protein in S. cerevisiae does not induce cellular stress and does not burden the cellular secretory machinery. There are only small changes in the cellular proteome of yeast secreting CALR at a high level.

7.
Electrophoresis ; 43(11): 1242-1245, 2022 06.
Artigo em Inglês | MEDLINE | ID: mdl-35285536

RESUMO

In contrast to bottom-up LC-MS only 2DE-MS can separate and detect a huge number of human protein species. Kwiatkowski et al. (in this issue) established parameters to estimate the amount of protein speciation for each human protein. Proteins identified in 2DE-MS approaches showed more protein speciation than in bottom-up LC-MS. The authors state that protein speciation is likely to increase the chance of proteins to be determined in 2-DE/MS, though admitting that low-sensitivity 2DE-MS methods were used in this study. In agreement with Kwiatkowski et al., we are convinced that the difference between 2DE-MS and bottom-up LC-MS will disappear, if high-resolution 2DE is combined with identification by a high-sensitivity LC-Orbitrap-MS. Meta-analysis of proteomic data is surely a promising tool, though the technological progress in 2DE and MS has to reach a plateau to enable useful comparisons.


Assuntos
Proteoma , Proteômica , Cromatografia Líquida/métodos , Eletroforese em Gel Bidimensional/métodos , Humanos , Proteômica/métodos , Espectrometria de Massas em Tandem/métodos
8.
Bioorg Chem ; 127: 105917, 2022 10.
Artigo em Inglês | MEDLINE | ID: mdl-35738217

RESUMO

Bromodomain-containing protein 4 (BRD4), which is a member of the bromodomain and extra-terminal domain (BET) family, plays an important role in the regulation of gene expression as the "reader" of epigenetic regulation. BRD4 has become a promising target to treat cancer, because the up-regulation of BRD4 expression is closely associated with the occurrence and development of various cancers. At present, several BRD4 inhibitors are in clinical trials for cancer therapy, but no BRD4 inhibitors are on the market. Here, we designed and synthesized a series of compounds bearing pyrrolo[4,3,2-de]quinolin-2(1H)-one scaffold through structural modification of natural products ammosamide B, which is a natural pyrroloquinoline derivative reported for its potential antitumor activity. All target compounds were evaluated for their BRD4 BD1 inhibition activities via the protein thermal shift assays or AlphaSceen assay. The representative compound 49 showed potent activity (IC50 = 120 nM). The co-crystal of compound 49 with BRD4 BD1 was solved to study the structure activity relationship, which showed that 49 could combine with the acetyl lysine binding site and formed a hydrogen bond with the conserved residue Asn140. The results demonstrate that compound 49 is worthy of further investigation as a promising BRD4 inhibitor.


Assuntos
Proteínas Nucleares , Quinolinas , Amidas , Epigênese Genética , Compostos Heterocíclicos com 3 Anéis , Pirróis , Quinolinas/farmacologia , Relação Estrutura-Atividade
9.
Can J Physiol Pharmacol ; 100(2): 93-106, 2022 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-35112597

RESUMO

Large clinical studies conducted with sodium-glucose co-transporter 2 inhibitors (SGLT2i) in patients with type 2 diabetes and heart failure with reduced ejection fraction have demonstrated their ability to achieve both cardiac and kidney benefits. Although there is huge evidence on SGLT2i-mediated clinical benefits both in diabetic and non-diabetic patients, the pathophysiological mechanisms underlying their efficacy are still poorly understood. Some favorable mechanisms are likely due to the prompt glycosuric action which is associated with natriuretic effects leading to hemodynamic benefits as well as a reduction in glomerular hyperfiltration and renin-angiotensin-aldosterone system activation. In addition to the renal mechanisms, SGLT2i may play a relevant role in cardiorenal axis protection by improving the cardiomyocyte metabolism, by exerting anti-fibrotic and anti-inflammatory actions, and by increasing cardioprotective adipokine expression. New studies will be needed to better understand the specific molecular mechanisms that mediate the SGLT2i favorable effects in patients suffering diabetes. Our aim is to first discuss about the molecular mechanisms underlying the cardiovascular benefits of SGLT2i in each of the main organs involved in the cardiorenal axis. Furthermore, we update on the most recent clinical trials evaluating the beneficial effects of SGLT2i in treatment of both diabetic and non-diabetic patients suffering heart failure.


Assuntos
Cardiotônicos , Diabetes Mellitus Tipo 2/tratamento farmacológico , Insuficiência Cardíaca/tratamento farmacológico , Inibidores do Transportador 2 de Sódio-Glicose/farmacologia , Inibidores do Transportador 2 de Sódio-Glicose/uso terapêutico , Adipocinas/metabolismo , Anti-Inflamatórios , Antifibróticos , Hemodinâmica/efeitos dos fármacos , Humanos , Glomérulos Renais/metabolismo , Miócitos Cardíacos/metabolismo , Sistema Renina-Angiotensina/efeitos dos fármacos
10.
Lett Appl Microbiol ; 74(6): 873-882, 2022 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-35138649

RESUMO

BACKGROUND AND AIM: Carbapenem resistance has become a major obstacle in combating Acinetobacter baumannii infections. Although enzymatic degradation by ß-lactamases is the pivotal mechanism of carbapenem resistance, porin deficiency has also been implicated in the mechanism. In this study, outer membrane proteins (OMPs) pattern of a clinical multidrug-resistant A. baumannii isolate were analysed in order to attain a deeper understanding of carbapenem-resistance strategies. METHODS: OMPs extracts, respectively, separated from carbapenem-resistant and -susceptible clinical A. baumannii isolates were compared using two-dimensional polyacrylamide gel electrophoresis. Differentially expressed proteins were identified by matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF). RESULTS: Twenty-three differently expressed proteins were identified between the resistant and susceptible isolates. Among them, six were annotated convincingly as OMPs in UniProt database. CarO was found absent from the resistant isolate and the expression levels of Omp33-36 and Omp25 were significantly lower than that in the susceptible counterpart. Strikingly, a LysM domain/BON superfamily protein, which has been linked to carbapenem resistance in Klebsiella pneumoniae, was found underexpressed by tenfold in the resistant isolate. CONCLUSION: Our study verified some porins which have been proven to play an important role in bacterial resistance against carbapenems. Underexpression of the LysM domain/BON superfamily protein may indicate its possible engagement in bacterial drug resistance, but its actual role requires more investigation.


Assuntos
Infecções por Acinetobacter , Acinetobacter baumannii , Infecções por Acinetobacter/microbiologia , Antibacterianos/farmacologia , Proteínas de Bactérias/genética , Proteínas de Bactérias/metabolismo , Carbapenêmicos/farmacologia , Humanos , Testes de Sensibilidade Microbiana , Porinas/genética , Proteoma/metabolismo , beta-Lactamases/genética , beta-Lactamases/metabolismo
11.
Int J Mol Sci ; 23(19)2022 Sep 21.
Artigo em Inglês | MEDLINE | ID: mdl-36232415

RESUMO

The use of tumor markers aids in the early detection of cancer recurrence and prognosis. There is a hope that they might also be useful in screening tests for the early detection of cancer. Here, the question of finding ideal tumor markers, which should be sensitive, specific, and reliable, is an acute issue. Human plasma is one of the most popular samples as it is commonly collected in the clinic and provides noninvasive, rapid analysis for any type of disease including cancer. Many efforts have been applied in searching for "ideal" tumor markers, digging very deep into plasma proteomes. The situation in this area can be improved in two ways-by attempting to find an ideal single tumor marker or by generating panels of different markers. In both cases, proteomics certainly plays a major role. There is a line of evidence that the most abundant, so-called "classical plasma proteins", may be used to generate a tumor biomarker profile. To be comprehensive these profiles should have information not only about protein levels but also proteoform distribution for each protein. Initially, the profile of these proteins in norm should be generated. In our work, we collected bibliographic information about the connection of cancers with levels of "classical plasma proteins". Additionally, we presented the proteoform profiles (2DE patterns) of these proteins in norm generated by two-dimensional electrophoresis with mass spectrometry and immunodetection. As a next step, similar profiles representing protein perturbations in plasma produced in the case of different cancers will be generated. Additionally, based on this information, different test systems can be developed.


Assuntos
Neoplasias , Proteoma , Biomarcadores Tumorais , Proteínas Sanguíneas , Detecção Precoce de Câncer , Eletroforese em Gel Bidimensional/métodos , Humanos , Neoplasias/diagnóstico , Proteoma/metabolismo
12.
Int J Mol Sci ; 23(7)2022 Mar 28.
Artigo em Inglês | MEDLINE | ID: mdl-35409079

RESUMO

Iron (Fe) and manganese (Mn) are two essential elements for plants that compete for the same uptake transporters and show conflicting interactions at the regulatory level. In order to understand the differential response to both metal deficiencies in plants, two proteomic techniques (two-dimensional gel electrophoresis and label-free shotgun) were used to study the proteome profiles of roots from tomato plants grown under Fe or Mn deficiency. A total of 119 proteins changing in relative abundance were confidently quantified and identified, including 35 and 91 in the cases of Fe deficiency and Mn deficiency, respectively, with 7 of them changing in both deficiencies. The identified proteins were categorized according to function, and GO-enrichment analysis was performed. Data showed that both deficiencies provoked a common and intense cell wall remodelling. However, the response observed for Fe and Mn deficiencies differed greatly in relation to oxidative stress, coumarin production, protein, nitrogen, and energy metabolism.


Assuntos
Solanum lycopersicum , Eletroforese , Solanum lycopersicum/metabolismo , Proteínas de Plantas/metabolismo , Raízes de Plantas/metabolismo , Proteoma/metabolismo , Proteômica/métodos
13.
Int J Mol Sci ; 23(4)2022 Feb 20.
Artigo em Inglês | MEDLINE | ID: mdl-35216460

RESUMO

Acute decompensated heart failure (ADHF) is a life-threatening clinical syndrome involving multi-organ function deterioration. ADHF results from multifaceted, dysregulated pathways that remain poorly understood. Better characterization of proteins associated with heart failure decompensation is needed to gain understanding of the disease pathophysiology and support a more accurate disease phenotyping. In this study, we used an untargeted mass spectrometry (MS) proteomic approach to identify the differential urine protein signature in ADHF patients and examine its pathophysiological link to disease evolution. Urine samples were collected at hospital admission and compared with a group of healthy subjects by two-dimensional electrophoresis coupled to MALDI-TOF/TOF mass spectrometry. A differential pattern of 26 proteins (>1.5-fold change, p < 0.005), mostly of hepatic origin, was identified. The top four biological pathways (p < 0.0001; in silico analysis) were associated to the differential ADHF proteome including retinol metabolism and transport, immune response/inflammation, extracellular matrix organization, and platelet degranulation. Transthyretin (TTR) was the protein most widely represented among them. Quantitative analysis by ELISA of TTR and its binding protein, retinol-binding protein 4 (RBP4), validated the proteomic results. ROC analysis evidenced that combining RBP4 and TTR urine levels highly discriminated ADHF patients with renal dysfunction (AUC: 0.826, p < 0.001) and significantly predicted poor disease evolution over 18-month follow-up. In conclusion, the MS proteomic approach enabled identification of a specific urine protein signature in ADHF at hospitalization, highlighting changes in hepatic proteins such as TTR and RBP4.


Assuntos
Insuficiência Cardíaca , Proteoma , Doença Aguda , Insuficiência Cardíaca/urina , Humanos , Proteômica/métodos , Curva ROC , Proteínas Plasmáticas de Ligação ao Retinol , Urinálise
14.
Molecules ; 27(13)2022 Jun 28.
Artigo em Inglês | MEDLINE | ID: mdl-35807402

RESUMO

Oxidative cyclization is one of the most significant reactions in organic synthesis. Naphthyridine derivatives are often used as luminescence materials in molecular recognition because of their rigid planar structure and as new drugs. Organic light-emitting diodes (OLEDs) have rapidly grown as one of the leading technologies for full-color display panels and eco-friendly lighting sources. In this work, we propose the synthesis of previously unknown benzo[b]chromeno[4,3,2-de][1,6]naphthyridines via intermolecular oxidative cyclization of 5-(2-hydroxy-6-oxocyclohexyl)-5H-chromeno[2,3-b]pyridines in formic acid. The investigation of the reaction mechanism using 1H-NMR monitoring made it possible to confirm the proposed mechanism of the transformation. The structure of synthesized benzo[b]chromeno[4,3,2-de][1,6]naphthyridines was confirmed by 2D-NMR spectroscopy. Such a rigid geometry of synthesized compounds is desired to minimize non-radiative energy losses in OLEDs. The quantum chemical calculations are also presented in the study.


Assuntos
Naftiridinas , Piridinas , Computadores , Ciclização , Espectroscopia de Ressonância Magnética , Estrutura Molecular , Naftiridinas/química , Estresse Oxidativo
15.
Mol Biol Rep ; 48(4): 3681-3693, 2021 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-33856605

RESUMO

Protein changes under drought or water stress conditions have been widely investigated. These investigations have given us enormous understanding of how drought is manifested in plants and how plants respond and adopt to such conditions. Chlorophyll fluoroescence, gas exchange, OMICS, biochemical and molecular analyses have shed light on regulation of physiology and photosynthesis of plants under drought. Use of proteomics has greatly increased the repertoire of drought-associated proteins which nevertheless, need to be investigated for their mechanistic and functional roles. Roles of such proteins have been succinctly discussed in various review articles, however more information on their functional role in countering drought is needed. In this review, recent developments in the field, alterations in the abundance of plant proteins in response to drought, monitored through numerous proteomic and immuno-blot analyses, and how these could affect plants growth and development, are discussed.


Assuntos
Secas , Fotossíntese , Proteínas de Plantas/metabolismo , Estresse Fisiológico , Proteínas de Plantas/genética , Plantas/genética , Plantas/metabolismo
16.
Can J Physiol Pharmacol ; 99(10): 1026-1035, 2021 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-33857388

RESUMO

Insulin resistance is a feature of pregnancy and is associated with increased levels of angiotensin II (Ang II) and insulin. Therefore, pregnancy may change insulin-induced vasodilation through changes in Ang II receptors. Insulin-induced vasorelaxation was evaluated in phenylephrine-precontracted aortic rings of pregnant and non-pregnant rats, using a conventional isolated organ preparation. Experiments were performed in thoracic or abdominal aorta rings with or without endothelium in the presence and absence of NG-nitro-L-arginine methyl ester (L-NAME) (10-5 M), losartan (10-7 M), or PD123319 (10-7 M). AT1 and AT2 receptor expressions were detected by immunohistochemistry. Insulin-induced vasodilation was endothelium- and nitric oxide-dependent and decreased in the thoracic aorta but increased in the abdominal segment of pregnant rats. The insulin's vasorelaxant effect was increased by losartan mainly on the thoracic aorta. PD123319 decreased insulin-induced vasorelaxation mainly in the pregnant rat abdominal aorta. AT1 receptor expression was decreased while AT2 receptor expression was increased by pregnancy. In conclusion, pregnancy changes insulin-induced vasorelaxation. Moreover, insulin vasodilation is tonically inhibited by AT1 receptors, while AT2 receptors appear to have an insulin-sensitizing effect. The role of pregnancy and Ang II receptors differ depending on the aorta segment. These results shed light on the role of pregnancy and Ang II receptors on the regulation of insulin-mediated vasodilation.


Assuntos
Bloqueadores do Receptor Tipo 1 de Angiotensina II/farmacologia , Aorta Torácica/efeitos dos fármacos , Insulina/farmacologia , Músculo Liso Vascular/efeitos dos fármacos , Prenhez/fisiologia , Receptor Tipo 1 de Angiotensina/metabolismo , Receptor Tipo 2 de Angiotensina/metabolismo , Vasodilatação/efeitos dos fármacos , Angiotensina II/metabolismo , Animais , Aorta Torácica/metabolismo , Aorta Torácica/fisiologia , Pressão Sanguínea/efeitos dos fármacos , Pressão Sanguínea/fisiologia , Feminino , Hipoglicemiantes/farmacologia , Músculo Liso Vascular/metabolismo , Gravidez , Ratos , Ratos Wistar , Receptor Tipo 1 de Angiotensina/química , Receptor Tipo 1 de Angiotensina/genética , Receptor Tipo 2 de Angiotensina/química , Receptor Tipo 2 de Angiotensina/genética , Vasodilatação/fisiologia
17.
Biotechnol Lett ; 43(3): 537-546, 2021 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-33386501

RESUMO

OBJECTIVE: Two-dimensional electrophoresis (2-DE) and MALDI-TOF/TOF mass spectrometry were performed to compare the proteomic alterations of lycorine-treated and control cells to further investigate the anti-multiple myeloma (MM) mechanisms of lycorine. RESULTS: Mass spectrometry results showed that after lycorine treatment of MM cells, 42% of the differentially expressed proteins had subcellular localization, mainly, on mitochondria. Voltage-dependent anion-selective channel protein 2 (VDAC2), the most abundant protein in the outer mitochondrial membrane, was up-regulated after treatment with lycorine and was subsequently verified by western blot analysis. Further studies on mitochondria found that lycorine was able to increase abnormal mitochondria and increase mitochondrial membrane potential. CONCLUSIONS: Lycorine can achieve the effect of resisting multiple myeloma by acting on VDAC2 and causing mitochondrial abnormalities.


Assuntos
Alcaloides de Amaryllidaceae/farmacologia , Mieloma Múltiplo/metabolismo , Fenantridinas/farmacologia , Proteoma/efeitos dos fármacos , Espectrometria de Massas por Ionização e Dessorção a Laser Assistida por Matriz/métodos , Canal de Ânion 2 Dependente de Voltagem/metabolismo , Antineoplásicos/farmacologia , Eletroforese em Gel Bidimensional , Humanos , Mitocôndrias/efeitos dos fármacos , Mitocôndrias/patologia , Proteoma/análise
18.
Adv Exp Med Biol ; 1346: 51-66, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-35113395

RESUMO

Proteome analysis of model and non-model plants is a genuine scientific field in expansion. Several technological advances have contributed to the implementation of different proteomics approaches for qualitative and quantitative analysis of the dynamics of cellular responses at the protein level. The design of time-resolved experiments and the emergent use of multiplexed proteome analysis using chemical or isotopic and isobaric labeling strategies as well as label-free approaches are generating a vast amount of proteomics data that is going to be essential for analysis of protein posttranslational modifications and implementation of systems biology approaches. Through the target proteomics analysis, especially the ones that combine the untargeted methods, we should expect an improvement in the completeness of the identification of proteome and reveal nuances of regulatory cellular mechanisms related to plant development and responses to environmental stresses. Both genomic sequencing and proteomic advancements in the last decades coupled to integrative data analysis are enriching biological information that was once confined to model plants. Therewith, predictions of a changing environment places proteomics as an especially useful tool for crops performance.


Assuntos
Proteômica , Biologia de Sistemas , Plantas/genética , Plantas/metabolismo , Processamento de Proteína Pós-Traducional , Proteoma/genética , Proteoma/metabolismo
19.
Ecotoxicology ; 30(6): 1007-1016, 2021 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-34110545

RESUMO

The diamondback moth (Plutella xylostella L.), is an economic pest of cruciferous plants worldwide, which causes great economic loss to cruciferous plants production. However, the pest has developed resistance to insecticides. One of such insecticides is chlorantraniliprole. The study of the mechanisms underlying resistance is key for the effective management of resistance. In this study, a comparative proteomics approach was used to isolate and identify various proteins that differed between chlorantraniliprole-susceptible and -resistant strains of P. xylostella. Eleven proteins were significantly different and were successfully identified by MALDI-TOF-MS. Metabolism-related proteins accounted for the highest proportion among the eleven different proteins. The function of the PxGST2L protein was validated by RNAi. Knockdown of PxGST2L reduced the GST activity and increased the toxicity of chlorantraniliprole to the diamondback moth. The resistance ratio of diamondback moth to chlorantraniliprole was reduced from 1029 to 505. The results indicated that PxGST2L is partly responsible for chlorantraniliprole insecticide resistance in DBM. Our finding contributes to the understanding of the mechanism underlying resistance to chlorantraniliprole in the DBM, to develop effective resistance management tactics.


Assuntos
Inseticidas , Mariposas , Animais , Glutationa Transferase/genética , Resistência a Inseticidas/genética , Inseticidas/toxicidade , Larva , Mariposas/genética , ortoaminobenzoatos/toxicidade
20.
J Sci Food Agric ; 101(8): 3489-3499, 2021 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-33274442

RESUMO

BACKGROUND: Prepared chicken breast deterioration is a complex biochemical process, of which protein change is one of the main features. The present research focuses on the analysis of proteins related to the deterioration in quality of prepared chicken breast through differential proteomics analysis. RESULTS: The physicochemical indexes of prepared chicken breast showed that quality gradually decreased at the second week of refrigerated storage, while the deterioration of chicken breast meat was obvious at the third week. Three key time points of quality change were determined to be at 0th, 2th and 5th week, respectively. In addition, 39 differential proteins were successfully identified using two-dimensional gel electrophoresis and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Most of the identified proteins showed significant differences in expression at the three key points of storage, of which actin, myosin, α-1,4-glucan phosphorylase, phosphoglucomutase 1, heat shock protein ß-1, tubulin ß-7 chain and skeletal muscle type tropomodulin (fragment) were closely related to the quality deterioration of prepared chicken breast, and thus potential indicator proteins to evaluate the quality of chicken breast. CONCLUSION: The current study indicated that the physicochemical quality of prepared breast notably changed during refrigerated storage. Three key time points of quality change in the storage process of prepared chicken breast were determined. Furthermore, differential proteomics identified the key proteins related to freshness, which provides a theoretical basis for exploring the mechanism of chicken breast deterioration. © 2020 Society of Chemical Industry.


Assuntos
Proteínas Aviárias/química , Carne/análise , Animais , Galinhas , Eletroforese em Gel Bidimensional , Armazenamento de Alimentos , Proteoma/química , Proteômica , Refrigeração , Espectrometria de Massas por Ionização e Dessorção a Laser Assistida por Matriz
SELEÇÃO DE REFERÊNCIAS
Detalhe da pesquisa