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1.
BMC Anesthesiol ; 24(1): 246, 2024 Jul 20.
Artigo em Inglês | MEDLINE | ID: mdl-39033150

RESUMO

BACKGROUND: Data on the effectiveness of erector spinae plane block (ESPB) for patients undergoing liver surgeries is limited and inconclusive. We hereby aimed to systematically review if ESPB can provide adequate analgesia after liver surgery. METHODS: PubMed, CENTRAL, Scopus, Embase, and gray literature were examined up to 25th April 2023 for randomized controlled trials (RCTs) comparing ESPB with control or spinal analgesia. RESULTS: Nine RCTs were included of which three compared ESPB with spinal analgesia. 24-hour opioid consumption did not differ significantly between ESPB vs. control (MD: -35.25 95% CI: -77.01, 6.52 I2 = 99%) or ESPB vs. spinal analgesia (MD: 2.32 95% CI: -6.12, 10.77 I2 = 91%). Comparing pain scores between ESPB and control, a small but significant effect favoring ESPB was noted at 12 h and 48 h, but not at 6-8 h and 24 h. Pain scores did not differ between ESPB and spinal analgesia. The risk of postoperative nausea and vomiting was also not significantly different between ESPB vs. control or spinal analgesia. GRADE assessment shows moderate certainty of evidence. CONCLUSION: ESPB may not provide any significant postoperative analgesia in liver surgery patients. There was a tendency of reduced opioid consumption with ESPB. Limited data also showed that ESPB and spinal analgesia had no difference in pain scores and 24-hour analgesic consumption.


Assuntos
Bloqueio Nervoso , Dor Pós-Operatória , Músculos Paraespinais , Humanos , Dor Pós-Operatória/prevenção & controle , Bloqueio Nervoso/métodos , Fígado/cirurgia , Ensaios Clínicos Controlados Aleatórios como Assunto/métodos , Analgésicos Opioides/administração & dosagem , Analgésicos Opioides/uso terapêutico
2.
Plant Cell Environ ; 46(11): 3464-3480, 2023 11.
Artigo em Inglês | MEDLINE | ID: mdl-37553868

RESUMO

Herbivore-induced plant volatiles (HIPVs) are critical compounds that directly or indirectly regulate the tritrophic interactions among herbivores, natural enemies and plants. The synthesis and release of HIPVs are regulated by many biotic and abiotic factors. However, the mechanism by which multiple factors synergistically affect HIPVs release remains unclear. Tea plant (Camellia sinensis) is the object of this study because of its rich and varied volatile metabolites. In this study, benzyl nitrile was released from herbivore-attacked tea plants more in the daytime than at night, which was consistent with the feeding behaviour of tea geometrid (Ectropis grisescens Warren) larvae. The Y-tube olfactometer assay and insect resistance analysis revealed that benzyl nitrile can repel tea geometrid larvae and inhibit their growth. On the basis of enzyme activities in transiently transformed Nicotiana benthamiana plants, CsCYP79 was identified as a crucial regulator in the benzyl nitrile biosynthetic pathway. Light signalling-related transcription factor CsPIF1-like and the jasmonic acid (JA) signalling-related transcription factor CsMYC2 serve as the activator of CsCYP79 under light and damage conditions. Our study revealed that light (abiotic factor) and herbivore-induced damage (biotic stress) synergistically regulate the synthesis and release of benzyl nitrile to protect plants from diurnal herbivorous tea geometrid larvae.


Assuntos
Camellia sinensis , Lepidópteros , Animais , Camellia sinensis/metabolismo , Herbivoria , Nitrilas/metabolismo , Larva/fisiologia , Chá/metabolismo
3.
Cell Mol Biol (Noisy-le-grand) ; 69(6): 116-124, 2023 Jun 30.
Artigo em Inglês | MEDLINE | ID: mdl-37605582

RESUMO

Angiogenesis is a dynamic and complex process leading to the development of new vessels from pre-existing vessels, which played a major role in pathological processes in many diseases. The present study aimed to investigate the effect of drug-contained serum of Traditional Chinese medicine (TCM) Wenjingtongluo decoction (WJLTD) on antiangiogenesis in Immortalized Human Umbilical Vascular Endothelial cells (IHUVECs), and elucidate the possible mechanisms based on proteomic analysis. Cells were treated with the drug-contained serum of the Drug-contained Serum (DS) of WJLTD and the blank serum (BS). The antiangiogenesis capacity of DS was evaluated using wound healing assay, Transwell, and tube formation assay. We performed three biological replicates to compare large-scale differential protein expression between two groups by tandem mass tag (TMT) labeling technology based on liquid chromatography-mass spectrometry analysis (LC-MS/MS). Gene Ontology (GO), Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analyses were performed for the general characterization of overall enriched proteins. For validation of the results of TMT, the candidate proteins were verified by parallel reaction monitoring (PRM) analysis. The results showed that 4% DS could inhibit the migration process of IHUVECs according to wound healing assay and Transwell. And tube formation ability was also dramatically inhibited (p<0.001). TMT analysis revealed 148 differentially expressed proteins between two groups that were identified and quantified. The further validation results of the two candidate proteins, Ferritin heavy chain (FTH1) and Ferritin light chain (FTL) from the Ferroptosis pathway, which played an important role in DS treatment, were consistent with those of LC-MS/MS. In conclusion, this is the first proteomics-based study to report the mechanism underlying DS treatment for angiogenesis. Further functional verification of the potential signaling pathways and the enriched proteins is warranted.


Assuntos
Células Endoteliais , Proteômica , Humanos , Cromatografia Líquida , Espectrometria de Massas em Tandem , Transdução de Sinais
4.
J Microencapsul ; 36(6): 566-575, 2019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-31411510

RESUMO

Objective: To improve the water solubility and enhance the oral bioavailability of gambogenic acid (GNA). Methods: GNA-phospholipid complex (GNA-PLC) micelles were successfully prepared by anti-solvent method. Results: The encapsulation efficiency of GNA-PLC micelles can reach 99.33 % (w/w). The average particle size of the GNA-PLC micelles was 291.23 nm which was approximate agreed with the transmission electron microscopy (TEM). In vitro release profile showed the GNA-PLC and GNA-PLC micelles have significant sustained-release of GNA compared with crude GNA. Pharmacokinetic parameters indicated that the area under concentration-time curve (AUC0→t) of GNA in cases of GNA-PLC and GNA-PLC micelles are 2.04- and 3.92-fold higher than crude GNA, respectively. Conclusions: The better water solubility and higher bioavailability of GNA in GNA-PLC micelles with significant sustained-release of GNA endow the nanoparticle with great potential in GNA delivery system.


Assuntos
Antineoplásicos Fitogênicos/administração & dosagem , Preparações de Ação Retardada/química , Micelas , Fosfolipídeos/química , Xantenos/administração & dosagem , Animais , Antineoplásicos Fitogênicos/química , Antineoplásicos Fitogênicos/farmacocinética , Disponibilidade Biológica , Liberação Controlada de Fármacos , Medicamentos de Ervas Chinesas/administração & dosagem , Medicamentos de Ervas Chinesas/química , Medicamentos de Ervas Chinesas/farmacocinética , Feminino , Garcinia/química , Células Hep G2 , Humanos , Masculino , Ratos Sprague-Dawley , Solubilidade , Xantenos/química , Xantenos/farmacocinética
5.
Pharm Dev Technol ; 24(10): 1236-1242, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31407940

RESUMO

Objective: Tanshinone IIA (TSN) and Tetramethylpyrazine (TMP) were combined in a composite, oil-in-water nanoemulsions (TSN/TMP O/W NEs) was prepared to prolong in vitro and vivo circulation time, and enhance the bioavailability of TSN. Material and methods: Physicochemical characterization of TSN/TMP O/W NEs was characterized systematically. The in vitro dissolution and in vivo pharmacokinetic experiments of TSN/TMP O/W NEs were also evaluated. Result: A formulation was optimized, yielding a 32.5 nm average particle size, an encapsulation efficiency of over 95 %, and were spherical in shape as shown by TEM. TSN/TMP O/W NEs were shown to extend the release and availability in vitro compared to raw compounds. In pharmacokinetic study, the AUC0→∞ and t1/2 of the TSN/TMP O/W NEs were 481.50 mg/L*min and 346.39 min higher than TSN solution, respectively. Brain tissue concentration of TSN was enhanced with TSN/TMP O/W NEs over raw TSN and even TSN O/W NEs. Conclusions: Therefore, nanoemulsions are an effective carrier to increase encapsulation efficiency of drugs, improve bioavailability and brain penetration for TSN - which is further enhanced by pairing with the co-delivery of TMP, providing a promising drug delivery.


Assuntos
Abietanos/química , Abietanos/farmacocinética , Encéfalo/metabolismo , Composição de Medicamentos/métodos , Nanocompostos/química , Pirazinas/química , Pirazinas/farmacocinética , Abietanos/sangue , Animais , Disponibilidade Biológica , Combinação de Medicamentos , Liberação Controlada de Fármacos , Estabilidade de Medicamentos , Emulsões , Tamanho da Partícula , Pirazinas/sangue , Ratos Sprague-Dawley , Solubilidade , Propriedades de Superfície , Distribuição Tecidual
6.
J Agric Food Chem ; 72(23): 13284-13296, 2024 Jun 12.
Artigo em Inglês | MEDLINE | ID: mdl-38808775

RESUMO

Benzyl nitrile from tea plants attacked by various pests displays a diurnal pattern, which may be closely regulated by the endogenous circadian clock. However, the molecular mechanism by the circadian clock of tea plants that regulates the biosynthesis and release of volatiles remains unclear. In this study, the circadian clock gene CsPCL1 can activate both the expression of the benzyl nitrile biosynthesis-related gene CsCYP79 and the jasmonic acid signaling-related transcription factor CsMYC2 involved in upregulating CsCYP79 gene, thereby resulting in the accumulation and release of benzyl nitrile. Therefore, the anti-insect function of benzyl nitrile was explored in the laboratory. The application of slow-release beads of benzyl nitrile in tea plantations significantly reduced the number of tea geometrids and had positive effects on the yield of fresh tea leaves. These findings reveal the potential utility of herbivore-induced plant volatiles for the green control of pests in tea plantations.


Assuntos
Camellia sinensis , Relógios Circadianos , Nitrilas , Proteínas de Plantas , Compostos Orgânicos Voláteis , Camellia sinensis/genética , Camellia sinensis/química , Camellia sinensis/metabolismo , Camellia sinensis/parasitologia , Animais , Compostos Orgânicos Voláteis/química , Compostos Orgânicos Voláteis/metabolismo , Compostos Orgânicos Voláteis/farmacologia , Proteínas de Plantas/genética , Proteínas de Plantas/metabolismo , Relógios Circadianos/genética , Nitrilas/farmacologia , Nitrilas/química , Nitrilas/metabolismo , Regulação da Expressão Gênica de Plantas , Mariposas/genética , Mariposas/efeitos dos fármacos , Mariposas/metabolismo , Inseticidas/farmacologia , Inseticidas/química
7.
Front Pharmacol ; 15: 1315001, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38562460

RESUMO

Introduction: Due to the cardiotoxicity of pirarubicin (THP), it is necessary to investigate new compounds for the treatment of THP-induced cardiotoxicity. Isoquercitrin (IQC) is a natural flavonoid with anti-oxidant and anti-apoptosis properties. Thus, the present study aimed to investigate the influence of IQC on preventing the THP-induced cardiotoxicity in vivo and in vitro. Methods: The optimal concentration and time required for IQC to prevent THP-induced cardiomyocyte damage were determined by an MTT assay. The protective effect was further verified in H9c2 and HCM cells using dichlorodihydrofluorescein diacetate fluorescent probes, MitoTracker Red probe, enzyme-linked immunosorbent assay, JC-1 probe, and real time-quantitative polymerase chain reaction (RT-qPCR). Rats were administered THP to establish cardiotoxicity. An electrocardiogram (ECG) was performed, and cardiac hemodynamics, myocardial enzymes, oxidative stress indicators, and hematoxylin-eosin staining were studied. Voltage-dependent anion channel 1 (VDAC1), adenine nucleotide translocase 1 (ANT1), and cyclophilin D (CYPD) were detected by qRT-PCR, and the Phlpp1/AKT/Bcl-2 axis proteins were detected by western blot, confirming that IQC markedly increased cell viability and superoxide dismutase (SOD) levels, diminished the levels of ROS and MDA, and elevated mitochondrial function and apoptosis in vivo and in vitro. Results: Results showed that IQC reduced THP-induced myocardial histopathological injury, electrocardiogram (ECG) abnormalities, and cardiac dysfunction in vivo. IQC also decreased serum levels of MDA, BNP, CK-MB, c-TnT, and LDH, while increasing levels of SOD and GSH. We also found that IQC significantly reduced VDAC1, ANT1, and CYPD mRNA expression. In addition, IQC controlled apoptosis by modulating Phlpp1/AKT/Bcl-2 signaling pathways. IQC markedly increased H9c2 and HCM cell viability and SOD levels, diminished the levels of ROS and MDA, and elevated mitochondrial function in H9c2 and HCM cells to defend against THP-induced cardiomyocyte apoptosis in vitro. The AKT inhibitor IMQ demonstrated that IQC lacked antioxidant and anti-apoptotic properties. Moreover, our data showed that IQC regulates Phlpp1 expression, thereby influencing the expression levels of p-AKT, cytochrome c, caspase-3, caspase-9, Bcl-2, and Bax. Discussion: In conclusion, our results indicate that IQC protects the changes in mitochondrial membrane permeability in cardiomyocytes by regulating the Phlpp1/AKT/Bcl-2 signaling pathway, inhibits the release of cytc from the mitochondrial inner membrane to the cytoplasm, forms apoptotic bodies, induces cell apoptosis, and reduces THP induced cardiotoxicity.

8.
Food Chem ; 449: 139173, 2024 Aug 15.
Artigo em Inglês | MEDLINE | ID: mdl-38593722

RESUMO

Most teas, including white tea, are produced from tender shoots containing both leaf and stem. However, the effect of the stem on white tea quality remains unclear, especially during withering, an essential process. Therefore, this study investigated the withering-induced changes in the leaves and stems of Camellia sinensis cv. 'Fudingdabai' by multi-group analysis. During withering, the levels of catechin and theobromine (i.e., major flavor-related compounds) decreased slightly, mainly in the leaves. The abundance of some proteinaceous amino acids related to fresh taste increased in stems due to increased protein hydrolysis. In addition, changes in biosynthetic pathways caused a decrease in theanine (a major non-proteinaceous amino acid) and an increase in gamma-aminobutyric acid in stems. Terpenes, mainly in the stems, were partially affected by withering. Phenylacetaldehyde, a major contributor to white tea aroma, increased mainly in the stems. These findings reflect the positive contribution of the stem to white tea quality.


Assuntos
Camellia sinensis , Folhas de Planta , Caules de Planta , Camellia sinensis/química , Camellia sinensis/metabolismo , Camellia sinensis/crescimento & desenvolvimento , Caules de Planta/química , Caules de Planta/metabolismo , Caules de Planta/crescimento & desenvolvimento , Folhas de Planta/química , Folhas de Planta/metabolismo , Folhas de Planta/crescimento & desenvolvimento , Chá/química , Chá/metabolismo , Catequina/análise , Catequina/metabolismo , Paladar
9.
J Orthop Surg Res ; 18(1): 439, 2023 Jun 17.
Artigo em Inglês | MEDLINE | ID: mdl-37328786

RESUMO

BACKGROUND: Knee Osteoarthritis (KOA) is one of the main causes of disability in the elderly and with limited treatment options. Swimming was considered as an ideal form of non-surgical management of KOA. Nevertheless, the mechanism of swimming intervene OA remains unclear. ACLT induced OA model was often used to study the pathogenesis and treatment of OA. Thus, we evaluated the protective effect of swimming on KOA mouse and tried to explore the underlying mechanism. METHODS: Forty C57BL/6 mice were randomly divided into five groups: Blank group, ACLT group, ACLT + Swim group, Sham group and Sham + Swim group (n = 8). OA model was established by Anterior Cruciate Ligament Transection surgery (ACLT). After modeling, mice in ACLT + Swim and Sham + Swim groups were trained with a moderate swimming program, 5 d/week, for 6 weeks. HE and Safranin-O/fast staining, Immunohistochemistry, TUNEL assay and Western blot were used to detect the effect of swimming on pathological changes, cell death and the mechanism in KOA mouse. RESULTS: Swimming significantly enhanced CoII expression and suppressed ADAMTS5 expression in cartilage of KOA mouse, thus ameliorated KOA development. Apoptotic and autophagic processes were enhanced in OA cartilage, which might be caused by down-regulation of PI3K/AKT pathway; swimming could activate PI3K/AKT pathway and thus regulate apoptosis and autophagy processes of chondrocytes. CONCLUSION: Swimming could prevent cell death of chondrocytes via PI3K/AKT pathways, thus delayed the progression of KOA in an experimental model.


Assuntos
Cartilagem Articular , Osteoartrite do Joelho , Camundongos , Animais , Condrócitos/metabolismo , Proteínas Proto-Oncogênicas c-akt/metabolismo , Fosfatidilinositol 3-Quinases/metabolismo , Natação , Cartilagem Articular/metabolismo , Modelos Animais de Doenças , Camundongos Endogâmicos C57BL , Osteoartrite do Joelho/patologia , Apoptose
10.
Hortic Res ; 9: uhac158, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-36324644

RESUMO

Herbivore-induced plant volatiles (HIPVs) help the tea plant (Camellia sinensis) adapt to environmental stress, and they are also quality-related components of tea. However, the upstream mechanism regulating the herbivore-induced expression of volatile biosynthesis genes is unclear, especially at the level of epigenetic regulation. In this study, similar to the effects of a tea green leafhopper infestation, treatments with exogenous jasmonic acid (JA) and histone deacetylase inhibitors significantly increased the (E)-nerolidol content in tea and induced the expression of the associated biosynthesis gene CsNES. Furthermore, a key transcription factor related to JA signaling, myelocytomatosis 2 (CsMYC2), interacted with histone deacetylase 2 (CsHDA2) in vitro and in vivo. A tea green leafhopper infestation inhibited CsHDA2 expression and decreased CsHDA2 abundance. Moreover, the tea green leafhopper infestation increased H3 and H4 acetylation levels in the promoter region of CsNES, which in turn upregulated the expression of CsNES and increased the (E)-nerolidol content. In this study, we revealed the effects of histone acetylations on the accumulation of HIPVs, while also confirming that CsHDA2-CsMYC2 is an important transcriptional regulatory module for the accumulation of (E)-nerolidol induced by tea green leafhoppers. The results of this study may be useful for characterizing plant aromatic compounds and the main upstream stress-responsive signaling molecules. Furthermore, the study findings will assist researchers clarify the epigenetic regulation influencing plant secondary metabolism in response to external stress.

11.
Metabolites ; 12(11)2022 Nov 03.
Artigo em Inglês | MEDLINE | ID: mdl-36355146

RESUMO

Lingtou Dancong oolong tea is a famous Chinese oolong tea due to its special honey-like aroma. However, little is known about its specific aroma profile and key contributors. Furthermore, whether the aroma characteristics of Lingtou Dancong oolong tea are affected by the environmental conditions at different altitudes is unknown. In this study, the aromas in Lingtou Dancong oolong tea were extracted and analyzed by stir-bar sorptive extraction (SBSE) combined with gas chromatography-olfactometry (GC-O) and GC-mass spectrometry (GC-MS), and the aroma profiles of tea plants grown at different altitudes were compared. We detected 59 odor compounds in Lingtou Dancong oolong tea. Eight compounds with honey and floral odors were identified as key components on the basis of GC-O, GC-MS, odor activity value, and flavor dilution analyses. Differences in the contents of precursor geranyl diphosphate and transcript levels of structural genes were found to be responsible for the differential accumulation of linalool and hotrienol among plants grown at different altitudes. This is the first report on the aroma characteristics and key contributors of Lingtou Dancong oolong tea and their differences, as affected by altitude. These results provide details of the chemical basis of the aroma quality of Lingtou Dancong oolong tea.

12.
Food Res Int ; 161: 111824, 2022 11.
Artigo em Inglês | MEDLINE | ID: mdl-36192959

RESUMO

The diverse tea (Camellia sinensis) germplasms in China include those that specifically accumulate metabolites, such as anthocyanin, catechin, amino acid, caffeine, aroma compound, and chlorophyll. There is interest in the derived products because of special flavor quality or high efficacy activity. This review describes the characteristics of specific tea germplasms and associated regulatory mechanisms. High expression levels of the corresponding biosynthetic genes lead to the substantial accumulation of anthocyanins. The increased metabolic flux from anthocyanins to galloylated catechins is responsible for the occurrence of high-catechin germplasms. The precursor ethylamine determines the differential abundance of l-theanine between tea and other plants. The high amino acid contents in albino germplasms are the result of decreased l-theanine hydrolysis. In low-caffeine tea germplasms, caffeine synthase genes are minimally expressed or mutated. High-aroma germplasms are associated with an increase in the precursors or strong stress-induced responses. Enhanced chloroplast and chlorophyll synthesis is a hallmark of the high-chlorophyll germplasms. Overall, biosynthetic metabolism might have contributed to the occurrence of specific tea germplasms. Furthermore, elucidation the deeper molecular mechanisms in specific tea germplasms are significant and urgent. The information will enhance our understanding of the metabolic activities in tea plants, with implications for tea breeding.


Assuntos
Camellia sinensis , Catequina , Antocianinas/análise , Cafeína/análise , Camellia sinensis/química , Catequina/análise , Clorofila/análise , Etilaminas/análise , Etilaminas/metabolismo , Melhoramento Vegetal , Folhas de Planta/química , Chá/metabolismo
13.
J Orthop Surg Res ; 16(1): 379, 2021 Jun 14.
Artigo em Inglês | MEDLINE | ID: mdl-34127028

RESUMO

BACKGROUND: Anterior cruciate ligament transection surgery (ACLT)-induced OA model was often used to investigate the molecular mechanism of knee osteoarthritis (KOA). Researches have shown that vascular endothelial growth factor (VEGF) played an important role in OA. The present study aimed to investigate the pathological changes after ACLT surgery and reveal the expression characteristics of the VEGF-A/VEGFR2 signaling pathway in this model. METHODS: Moderate KOA model was established by ACLT, and 1, 2, 4, 8, and 12 weeks after surgery, hematoxylin-eosin (HE) and Safranin-O(S-O) staining were used to detect the pathological changes in mouse knee cartilage, and the matrix biomarkers A Disintegrin and Metalloproteinase with Thrombospondin Motifs 5(ADAMTS5), Collagen II (COL-II) were detected using immunohistochemistry (IHC), CD31 was detected by immunofluorescence (IF) to show the vascular invasion in cartilage, and proteins expression of VEGF-A pathway were detected by Western blot (WB). Meanwhile, the inflammatory biomarkers cyclooxygenase-2 (COX-2) and inducible nitric oxide synthase (iNOS) in cartilage were detected by WB. RESULTS: ACLT surgery can lead to degeneration of cartilage in mice, and the characteristics of the lesion were time-dependent. The ADAMTS5-positive cells increased while COL-II decreased in OA cartilage with time, and new blood vessels labeled by CD31 can be seen from 1 week in OA cartilage, and increased in 8 and 12 weeks. The expression of VEGF-A, VEGFR2, COX-2, and iNOS were higher than control groups, which were basically consistent with the degree of osteoarthritis. CONCLUSIONS: The degenerative degree of articular cartilage was time-dependent; angiogenesis and inflammation were important pathological changes of cartilage in KOA. The expression of the VEGF-A/VEGFR2 signaling pathway was basically correlated with the degree of KOA.


Assuntos
Ligamento Cruzado Anterior/cirurgia , Cartilagem Articular/metabolismo , Cartilagem Articular/patologia , Osteoartrite do Joelho/genética , Osteoartrite do Joelho/metabolismo , Transdução de Sinais , Fator A de Crescimento do Endotélio Vascular/metabolismo , Animais , Cartilagem Articular/irrigação sanguínea , Modelos Animais de Doenças , Feminino , Inflamação , Masculino , Camundongos Endogâmicos C57BL , Neovascularização Patológica , Osteoartrite do Joelho/patologia , Fatores de Tempo , Fator A de Crescimento do Endotélio Vascular/fisiologia , Receptor 2 de Fatores de Crescimento do Endotélio Vascular/metabolismo
14.
Nanomaterials (Basel) ; 11(10)2021 Oct 14.
Artigo em Inglês | MEDLINE | ID: mdl-34685150

RESUMO

A polarization-insensitive broadband terahertz absorber based on single-layer graphene metasurface has been designed and simulated, in which the graphene metasurface is composed of isolated circular patches. After simulation and optimization, the absorption bandwidth of this absorber with more than 90% absorptance is up to 2 THz. The simulation results demonstrate that the broadband absorption can be achieved by combining the localized surface plasmon (LSP) resonances on the graphene patches and the resonances caused by the coupling between them. The absorption bandwidth can be changed by changing the chemical potential of graphene and the structural parameters. Due to the symmetrical configuration, the proposed absorber is completely insensitive to polarization and have the characteristics of wide angle oblique incidence that they can achieve broadband absorption with 70% absorptance in the range of incident angle from 0° to 50° for both TE and TM polarized waves. The flexible and simple design, polarization insensitive, wide-angle incident, broadband and high absorption properties make it possible for our proposed absorber to have promising applications in terahertz detection, imaging and cloaking objects.

15.
Artigo em Inglês | MEDLINE | ID: mdl-32802130

RESUMO

BACKGROUND: Cancer-induced bone pain (CIBP) is a highly prevalent symptom, which afflicts vast majority of patients who suffer from cancer. The current treatment options failed to achieve satisfactory effect and the side effects were prominent. Recent randomized controlled trials (RCTs) of animal demonstrate the benefit of acupuncture for CIBP. We sought to determine if the pooled data from available RCTs supports the use of acupuncture for CIBP. METHODS: A literature search for randomized controlled trials was conducted in six electronic databases from inception to May 31, 2019. Meta-analysis was performed with Review Manager 5.3 software; the publication bias was assessed by Stata 12.0 software. We used random effects model for pooling data because heterogeneity is absolute among studies to some extent. RESULTS: Twenty-four trials were included in the review, of which 12 trials provided detailed data for meta-analyses. Preliminary evidence indicates that compared to wait list/sham group, acupuncture was effective on increasing paw withdrawal threshold (PWT) and paw withdrawal latency (PWL). Compared to medicine, acupuncture was less effective on PWT, but as effective as medicine on PWL. Acupuncture can reinforce medicine's effect on PWT and PWL. Compared to the control group, acupuncture was superior to increase body weight (BW), decrease spinal cord glial fibrillary acidic protein (GFAP), and interleukin-1ß (IL-1ß). Furthermore, some studies showed acupuncture delay or partially reverse morphine tolerance. Three studies found acupuncture has no effect on PWT, but 2 of them found acupuncture could enhance small dose of Celebrex's effect on CIBP. CONCLUSIONS: Acupuncture was superior to wait list/sham acupuncture on increasing PWT and has no less effect on increasing PWL compared to medicine; acupuncture improved the efficacy of drugs, increased the CIBP animals' body weight, and decreased their spinal cord GFAP and IL-1ß. High-quality studies are necessary to confirm the results.

16.
Int J Pharm ; 587: 119665, 2020 Sep 25.
Artigo em Inglês | MEDLINE | ID: mdl-32702449

RESUMO

As one of the active pharmaceutical ingredients in Gamboge, Gambogenic acid (GNA) has shown diverse anti-tumor activities. To reduce the vascular irritation of GNA and improve its water solubility, tumor targeting, and bioavailability, GNA loaded Zein nanoparticles (GNA@Zein NPs) was further coated by polydopamine (PDA) to develop GNA@Zein-PDA NPs by anti-solvent precipitation and surface modification. The results showed that particle size and Zeta potential of GNA@Zein-PDA NPs were about 310 nm and -40.8 mV with core-shell morphology confirmed by TEM. GNA@Zein-PDA NPs increased the water solubility of GNA by more than 700 times and showed pH-sensitive release behavior in PBS with pH 6.86. In vitro cytotoxicity tests showed that GNA@Zein-PDA NPs had higher inhibitory activity on HepG2 cells than free GNA, and their IC50 were 1.59 µg/mL and 9.89 µg/mL, respectively. Additionally, the hemolysis and vascular irritation assay showed that GNA@Zein-PDA NPs had good cytocompatibility and reduced the irritation of GNA to blood vessels. Moreover, the in vivo pharmacokinetic experiments exhibited that the Cmax and AUC0-t of GNA@Zein-PDA NPs were significantly improved approximately by 2.09-fold and 3.48-fold over that of GNA, respectively. In conclusion, GNA@Zein-PDA NPs solve many defects of GNA and provide a tumor-targeting drug delivery for GNA.


Assuntos
Nanopartículas , Zeína , Portadores de Fármacos , Concentração de Íons de Hidrogênio , Indóis , Tamanho da Partícula , Polímeros , Xantenos
17.
J Pharm Pharmacol ; 72(4): 496-506, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-31975457

RESUMO

OBJECTIVES: Zein nanoparticles (Zein NPs) were used as a hydroxyapatite (HA) biomineralization template to generate HA/Zein NPs. Doxorubicin hydrochloride (DOX) was loaded on HA/Zein NPs (HA/Zein-DOX NPs) to improve its pH-sensitive release, bioavailability and decrease cardiotoxicity. METHODS: HA/Zein-DOX NPs were prepared by phase separation and biomimetic mineralization method. Particle size, polydispersity index (PDI), Zeta potential, transmission electron microscope, X-ray diffraction and Fourier-transform infrared spectroscopy of HA/Zein-DOX NPs were characterized. The nanoparticles were then evaluated in vitro and in vivo. KEY FINDINGS: The small PDI and high Zeta potential demonstrated that HA/Zein-DOX NPs were a stable and homogeneous dispersed system and that HA was mineralized on Zein-DOX NPs. HA/Zein-DOX NPs showed pH-sensitive release. Compared with free DOX, HA/Zein-DOX NPs increased cellular uptake which caused 7 times higher in-vitro cytotoxicity in 4T1 cells. Pharmacokinetic experiments indicated the t1/2ß and AUC0- t of HA/Zein-DOX NPs were 2.73- and 3.12-fold higher than those of DOX solution, respectively. Tissue distribution exhibited HA/Zein-DOX NPs reduced heart toxicity with lower heart targeting efficiency (18.58%) than that of DOX solution (37.62%). CONCLUSION: In this study, HA/Zein-DOX NPs represented an antitumour drug delivery system for DOX in clinical tumour therapy with improved bioavailability and decreased cardiotoxicity.


Assuntos
Doxorrubicina/administração & dosagem , Portadores de Fármacos/farmacocinética , Sistemas de Liberação de Medicamentos/métodos , Durapatita/farmacocinética , Nanopartículas/química , Zeína/farmacocinética , Animais , Disponibilidade Biológica , Linhagem Celular , Sobrevivência Celular/efeitos dos fármacos , Portadores de Fármacos/química , Liberação Controlada de Fármacos , Durapatita/química , Camundongos , Ratos , Ratos Sprague-Dawley , Distribuição Tecidual
18.
J Pharm Pharmacol ; 71(6): 929-936, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-30834522

RESUMO

OBJECTIVES: Resveratrol (Res), a naturally occurring polyphenol, has shown pharmacological activities in treatment of liver diseases. However, the application of Res was limited by its poor bioavailability and liver targeting. Herein, 3-O-ß-D-Galactosylated Resveratrol (Gal-Res) was synthesized by structural modification of Res to enhance bioavailability and liver targeting. METHODS: The Gal-Res was characterized by IR, 1 H-NMR spectra and MS. The in vitro antitumour experiments, in vivo pharmacokinetics and biodistribution studies were evaluated. RESULTS: Gal-Res was successfully synthesized in our study. Compared to Res, Gal-Res resulted in enhanced cytotoxicity in HepG2 cells. After intravenous injection of normal SD rats, Gal-Res significantly improved the bioavailability of Res and the Cmax and AUC0-t of Gal-Res were 3.186 and 3.929 time than that of Res. In addition, in the study of liver targeting, the relative uptake rate (Re ) of Gal-Res in the liver (2.006) is the largest. The drug targeting efficiency (Te ; 38.924%) of Gal-Res was greater than that of Res. These showed that Gal-Res could significantly improve the distribution ability of Res in liver. CONCLUSIONS: On the whole, Gal-Res increased cellular uptake to HepG2 cells, bioavailability and liver targeting, providing its future clinical application in the treatment of liver diseases.


Assuntos
Sistemas de Liberação de Medicamentos , Galactose/química , Fígado/metabolismo , Resveratrol/administração & dosagem , Animais , Área Sob a Curva , Disponibilidade Biológica , Células Hep G2 , Humanos , Injeções Intravenosas , Espectrometria de Massas , Espectroscopia de Prótons por Ressonância Magnética , Ratos , Ratos Sprague-Dawley , Resveratrol/química , Resveratrol/farmacocinética , Espectrofotometria Infravermelho , Distribuição Tecidual
19.
Biomed Mater Eng ; 30(1): 11-22, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30530955

RESUMO

In order to enhance lipophilicity and oral bioavailability of paeoniflorin (PF), this study developed paeoniflorin-phospholipid complex (PF-PLC) by solvent-evaporation method. The optimum preparation technology of PF-PLC was screened by the combination of single factor and orthogonal experiment. The physicochemical properties of PF-PLC were evaluated via differential scanning calorimetry (DSC), Fourier-transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD) and oil-water partition coefficient study (lgP). The result of FTIR spectra indicated that there was some strong hydrogen bond interaction and good compatibility between the phospholipid molecule and PF in the complex. DSC and XRD structure analysis showed that PF was in form of amorphous structure in PF-PLC, and lgP of PF-PLC was enhanced, suggesting that the lipophilicity of PF-PLC was higher than that of PF. In vitro release of PF-PLC showed slower release than PF solution with its cumulative release rate of 93.81% at 24 h compared to 93.43% of PF at 1.5 h. In pharmacokinetic experiments, the AUC and Cmax of the PF-PLC were 1.97-fold and 2.5-fold higher than PF solution. These results suggested that PF-PLC could enhance lipophilicity and oral bioavailability of PF and provide a promising delivery system for the application of PF.


Assuntos
Anti-Inflamatórios não Esteroides/administração & dosagem , Portadores de Fármacos/química , Glucosídeos/administração & dosagem , Monoterpenos/administração & dosagem , Fosfolipídeos/química , Administração Oral , Animais , Anti-Inflamatórios não Esteroides/sangue , Anti-Inflamatórios não Esteroides/química , Área Sob a Curva , Feminino , Glucosídeos/sangue , Glucosídeos/química , Masculino , Monoterpenos/sangue , Monoterpenos/química , Paeonia/química , Ratos Sprague-Dawley
20.
J Pharm Pharmacol ; 71(11): 1626-1634, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31468524

RESUMO

OBJECTIVES: Gambogenic acid (GNA), one of the main active ingredients isolated from Garcinia cambogia, has shown diverse antitumour activities. However, short biological half-life and low oral bioavailability severely limit its clinical application. Here, we developed GNA-loaded zein nanoparticles (GNA-ZN-NPs) based on phospholipid complex and zein nanoparticles to prolong the circulation time and enhance oral bioavailability of GNA. METHODS: The physicochemical properties of GNA-ZN-NP were characterized in details. The in vitro release profile, in vivo pharmacokinetic experiments and tissue distribution of GNA-ZN-NPs were also evaluated. KEY FINDINGS: The particle size, PDI and encapsulation efficiency of GNA-ZN-NPs were 102.90 nm, 0.027 and 76.35 ± 0.64%, respectively. The results of SEM, FTIR, DSC and XRD demonstrated that GNA-ZN-NPs were prepared successfully. The in vitro dissolution of GNA-ZN-NPs exhibited controlled release compared with raw GNA solution. The pharmacokinetic study showed that the AUC of GNA-ZN-NPs was significantly increased, and the t1/2 and MRT values of GNA-ZN-NPs were 3.21-fold and 2.19-fold higher than that of GNA solution. Tissue distribution results illustrated that GNA-ZN-NPs showed hepatic-targeting properties. CONCLUSION: GNA-ZN-NPs significantly enhanced the oral bioavailability and prolonged half-life of GNA, providing a promising oral drug delivery system to improve in vivo pharmacokinetic behaviour of GNA.


Assuntos
Nanopartículas/química , Xantenos/química , Xantenos/farmacocinética , Zeína/química , Animais , Disponibilidade Biológica , Preparações de Ação Retardada/química , Preparações de Ação Retardada/farmacocinética , Portadores de Fármacos/química , Sistemas de Liberação de Medicamentos/métodos , Feminino , Meia-Vida , Masculino , Tamanho da Partícula , Ratos , Ratos Sprague-Dawley
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