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2.
Diabetes Res Clin Pract ; : 108842, 2021 Apr 29.
Artigo em Inglês | MEDLINE | ID: mdl-33933497

RESUMO

AIM: To study the association between diabetes and the prevalence of and risk factors for polypharmacy among adults aged 50 and older in England. METHODS: A cross-sectional study (2012-2013) of the English Longitudinal Study of Ageing. Polypharmacy was defined as taking 5-9 long-term medications a day and heightened polypharmacy as 10 or more. Diabetes included diagnosed and undiagnosed cases (glycated haemoglobin ≥ 6.5% (48 mmol/mol)). RESULTS: Of 7729 participants, 1100 people had diabetes and showed higher prevalence rates of polypharmacy (41.1% vs 14.8%) and heightened polypharmacy (5.8% vs 1.7%) than those without diabetes, even when antihyperglycemic medications were excluded. Risk factors for polypharmacy also differed according to diabetes status. Among people with diabetes, risk factors for polypharmacy and heightened polypharmacy were having more long-term conditions (relative risk ratio (RRR) =1.86; 3.51) and being obese (RRR=1.68; 3.68), while females were less likely to show polypharmacy (RRR=0.51) and heightened polypharmacy (RRR=0.51) than males. Older age (RRR=1.04) was only related to polypharmacy among people without diabetes. CONCLUSIONS: Adults with diabetes had higher prevalence rates of polypharmacy and heightened polypharmacy than those without diabetes, regardless of including antihyperglycemic drugs. Early detection of polypharmacy among older people with diabetes needs to focus on co-morbidities and obesity.

3.
J Phys Chem Lett ; : 4104-4111, 2021 Apr 22.
Artigo em Inglês | MEDLINE | ID: mdl-33885308

RESUMO

Strain engineering is widely employed to manipulate the intrinsic relationship of activity and the crystal structure, while the mechanism and rational strategy toward high-performance devices are still under investigation. Here straining engineering is utilized to manipulate a series of a typical perovskite structures via introducing different types of heteroions (Bi1-xMxFeO3, M = Ca2+ or Y3+ ion). The space group R3c in BiFeO3 perovskites is found to be maintained with substituting a certain amount of heteroions at Bi3+ sites (<5%), while it would shift into either space groups P4mm (with Ca2+ substitute) or Pnma (with Y3+ substitute) beyond some critical doping amounts (>5%). Such a transformation is linked with the mismatched crystal strain induced by the heteroions substituted at Bi3+ sites, while the activity, stability, and energy storage capability of Bi1-xMxFeO3 have been essentially varied. The results offer a strategy for manipulating stability and activity of perovskites in electrochemical energy conversion and storage.

4.
Int J Infect Dis ; 2021 Apr 17.
Artigo em Inglês | MEDLINE | ID: mdl-33878461

RESUMO

OBJECTIVES: The treatment of acute herpangina is inconsistent. We aim to evaluate the effectiveness and safety of interferon α-2b spray versus Ribavirin for the disease. METHODS: A randomized, controlled trial was conducted in eight hospitals in China between 2016 and 2018. 668 patients (1-7 years old) were randomized into experimental group (treated with Interferon α-2b spray) or control group (received Ribavirin Aerosol). Body temperature returned to normal within 72 hours and remained for 24 hours was the primary outcome; release of oral herpes and adverse events were the secondary outcomes. RESULTS: (1) The average age of onset was 2.5 years old. (2) After 72 hours' treatment, body temperature of 98.5% patients in experimental group and 94.3% in control group returned to normal and lasted for 24 hours (P = 0.004). The differences were greater at 48 hours' treatment (95.2% vs. 85.9%, P < 0.001) and at 24 hours (77.5% vs. 66.5%, P = 0.001). (3) The rate of improved oral herpes in experimental group were higher than that in control group (46.7% vs.37.1%, P = 0.011). No adverse reaction occurred. CONCLUSIONS: Local application of recombinant interferon α-2b spray showed better efficacy for acute herpangina in children. It was safe for use.

5.
Artigo em Inglês | MEDLINE | ID: mdl-33886447

RESUMO

Two isolates from Canada and the USA (UAMH 7122 and UAMH 7211, respectively) previously identified as Stachybotrys eucylindrosporus were studied by morphology and six-locus phylogeny (cmdA, ITS, LSU, rpb2, tef1α and tub2). UAMH 7122 and UAMH 7211 are morphologically related but phylogenetically distinct from Striatibotrys eucylindrosporus (≡Stachybotrys eucylindrosporus) and Str. rhabdosporus. Hence, UAMH 7122 and UAMH 7211 are described as a new species, Striatibotrys neoeucylindrosporus sp. nov. with UAMH 7211 as the holotype. The characters of this species include some phialides proliferating by holoblastic extension of phialides and conidia clavate, subcylindrical or cylindrical ellipsoid, or dumbbell-shaped, dark brown to olivaceous grey when mature, longitudinally striate, 10.3-12.3×3-3.8 µm. A key to the species of Striatibotrys is provided.

6.
Chemistry ; 2021 Apr 20.
Artigo em Inglês | MEDLINE | ID: mdl-33876876

RESUMO

Oxygen reduction reaction (ORR) is essential in many life processes and energy conversion systems. Inspired by enzymatic oxygen activation/reduction processes, it is desirable to design transition metal molecular catalysts as an alternative to noble-metal-Pt-based ORR electrocatalysts in view point of fuel cell commercialization. Herein, we fabricate bio-inspired molecular catalysts electrografted on multiwalled carbon nanotubes (MWCNTs), where iron porphyrin FeF 20 TPP  is coordinated with covalently electrografted axial ligand on the MWCNTs' surface varying from thiophene to imidazole. With the change of axial coordination environment, the catalysts' electrocatalytic activity varied accordingly, and the imidazole coordinated catalyst MWCNTs-Im-FeF 20 TPP exhibited the highest ORR activity among the prepared catalysts. When MWCNTs-Im-FeF 20 TPP was loaded on the cathode of a zinc-air battery assembly, open-cell voltage (OCV) of 1.35 V and the maximum power density ( P max ) of 110 mW cm -2 were achieved, which was higher than those of MWCNTs-Thi-FeF 20 TPP (OCV = 1.30 V, P max = 100 mW cm -2 ) and MWCNTs-Ox-FeF 20 TPP (OCV = 1.28 V, P max = 86 mW cm -2 ) and comparable with that loaded with a Pt/C catalyst (OCV = 1.45 V, P max = 120 mW cm -2 ) under similar experimental conditions. This study provides a time-saving method to prepare covalently immobilized molecular electrocatalysts on carbon-based materials with structure-performance correlation, which is also applicable to the design of other electrografted catalysts for energy conversion.

7.
Nat Prod Bioprospect ; 2021 Apr 16.
Artigo em Inglês | MEDLINE | ID: mdl-33861417

RESUMO

Sixteen diterpenoid alkaloids (DAs), including six aconitine-type alkaloids (5 and 9 - 13), seven 7,17-seco-aconitine-type alkaloids (1 - 4, 6 - 8), two napelline-type alkaloids (14 and 15) as well as one veatchine-type alkaloid (16), were isolated from the aerial parts of Aconitum flavum Hand.-Mazz. In which, flavumolines A - D (1 - 4) were four new ones, and flavumoline E (5) was reported as natural compound for the first time. Their chemical structures were elucidated by the analysis of extensive spectroscopic data. The inhibitory activities of these isolates on Cav3.1 low voltage-gated Ca2+ channel, NO production in LPS-activated RAW264.7cells, five human tumor cell lines, as well as acetylcholinesterase (AChE) were tested.

8.
Molecules ; 26(7)2021 Mar 30.
Artigo em Inglês | MEDLINE | ID: mdl-33808318

RESUMO

Liver disorders have been recognized as one major health concern. Fucoidan, a sulfated polysaccharide extracted from the brown seaweed Fucus serratus, has previously been reported as an anti-inflammatory and antioxidant. However, the discovery and validation of its hepatoprotective properties and elucidation of its mechanisms of action are still unknown. The objective of the current study was to investigate the effect and possible modes of action of a treatment of fucoidan against thioacetamide (TAA)-induced liver injury in male C57BL/6 mice by serum biochemical and histological analyses. The mouse model for liver damage was developed by the administration of TAA thrice a week for six weeks. The mice with TAA-induced liver injury were orally administered fucoidan once a day for 42 days. The treated mice showed significantly higher body weights; food intakes; hepatic antioxidative enzymes (catalase, glutathione peroxidase (GPx), and superoxide dismutase (SOD)); and a lower serum alanine aminotransferase (ALT), aspartate aminotransferase (AST), tumor necrosis factor-α (TNF-α), interleukin-1ß (IL-1ß), and C-reactive protein (CRP) levels. Additionally, a reduced hepatic IL-6 level and a decreased expression of inflammatory-related genes, such as cyclooxygenase-2 (COX-2), and inducible nitric oxide synthase (iNOS) mRNA was observed. These results demonstrated that fucoidan had a hepatoprotective effect on liver injury through the suppression of the inflammatory responses and acting as an antioxidant. In addition, here, we validated the use of fucoidan against liver disorders with supporting molecular data.

9.
J Nurs Res ; 2021 Apr 09.
Artigo em Inglês | MEDLINE | ID: mdl-33840769

RESUMO

BACKGROUND: Hand massage therapies have been used to relieve anxiety and pain in various clinical situations. The effects of machine-based hand massage on preoperative anxiety in ambulatory surgery settings have not been evaluated. The hypothesis examined in this study is that machine-based hand massage is as effective as physical massage in ambulatory surgery patients awaiting surgical procedures. PURPOSE: This prospective study was designed to investigate the effect of machine-based hand massage on preoperative anxiety and vital signs in ambulatory surgery patients. METHODS: One hundred ninety-nine patients aged 18 years and older who were scheduled to receive ambulatory surgery were recruited from the Taipei Municipal Wanfang Hospital in Taipei City, Taiwan. The patients were assigned randomly to the experimental group (n = 101), which received presurgical machine-based hand massage therapy, and the control group (n = 98), which received no intervention. The patients in both groups completed the Spielberger State-Trait Anxiety Inventory short form at preintervention (baseline) and postintervention. RESULTS: Within-group comparisons of Spielberger State-Trait Anxiety Inventory short form scores showed significant decreases between preintervention and postintervention scores in the experimental group (44.3 ± 11.2 to 37.9 ± 8.7) and no significant change in the control group. Within-group comparisons of vital signs revealed a significant increase in mean respiration rate between baseline and postintervention in both groups (both ps < .05). Blood pressure was found to have decreased significantly only in the control group at postintervention (p < .05). No significant preintervention to postintervention change in pulse was observed in either group. CONCLUSIONS: The findings of this study indicate that machine-based hand massage reduces anxiety significantly in patients awaiting ambulatory surgery while not significantly affecting their vital signs.

10.
Behav Neurol ; 2021: 5681913, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33833827

RESUMO

Aim: To investigate the effects of light-to-moderate drinking on the cognitive function of the elderly in a large elderly community cohort. Although heavy drinking is linked with impaired brain functions, the effects of light-to-moderate drinking on the cognitive function of the elderly are still controversial. Methods: A total of 1469 nondemented elderly men from 15 research centers in 8 cities and provinces were included and divided into two groups: drinking (531 subjects) and nondrinking (938 subjects). Cognitive functions were assessed by the Beijing version of the Montreal Cognitive Assessment (MoCA) at baseline and one-year follow-up. Results: There was no difference in total cognitive scores between the light-to-moderate drinking and nondrinking groups at baseline and follow-up. Nonalcohol users performed better naming and abstraction function at baseline and better naming function at follow-up. There was no difference in cognitive performance decline and new-onset dementia rates at follow-up. Conclusions: Light-to-moderate alcohol consumption had no significant impact on the overall cognitive function and the risk of dementia in elderly men.

11.
Org Biomol Chem ; 19(15): 3359-3369, 2021 Apr 26.
Artigo em Inglês | MEDLINE | ID: mdl-33899876

RESUMO

Various ß-indolyl sulfoximidoyl amides were efficiently prepared from ortho-iodoanilines, propargyl bromides, 1 atm of CO, and substituted NH-sulfoximines, through a palladium-catalyzed indole annulation/carbonyl insertion/C-N bond formation cascade. Mostly good to high yields of the products were obtained through this multi-step, one-pot reaction protocol under very gentle reaction conditions. The obtained ß-indolyl sulfoximidoyl amides could be converted into biologically interesting sulfoximine analogues that contain a tryptamine moiety.

12.
FEBS Lett ; 2021 Apr 28.
Artigo em Inglês | MEDLINE | ID: mdl-33909294

RESUMO

The OV20.0 virulence factor of orf virus (ORFV) antagonizes host antiviral responses. One mechanism through which it functions is by inhibiting activation of the dsRNA-activated protein kinase R (PKR) by sequestering dsRNA and by physically interacting with PKR. Sequence alignment indicated that several key residues critical for dsRNA-binding were conserved in OV20.0, and their contribution to OV20.O function was investigated in this study. We found that residues F141, K160, R164 were responsible for the dsRNA-binding ability of OV20.0. Interestingly, mutation at K160 (K160A) diminished the OV20.0-PKR interaction and further reduced the inhibitory effect of OV20.0 on PKR activation. Nevertheless, OV20.0 homodimerization was not influenced by K160A. The contribution of the dsRNA-binding domain and K160 to the suppression of RNA interference by OV20.0 was further demonstrated in plants. In summary, K160 is essential for the function of OV20.0, particularly its interaction with dsRNA and PKR that ultimately contributes to the suppression of PKR activation.

13.
Preprint | bioRxiv | ID: ppbiorxiv-440833

RESUMO

Summary/AbstractFACT (FAcilitates Chromatin Transcription) is a heterodimeric protein complex composed of SUPT16H and SSRP1, and a histone chaperone participating in chromatin remodeling during gene transcription. FACT complex is profoundly regulated, and contributes to both gene activation and suppression. Here we reported that SUPT16H, a subunit of FACT, is acetylated at lysine 674 (K674) of middle domain (MD), which involves TIP60 histone acetyltransferase. Such acetylation of SUPT16H is recognized by bromodomain protein BRD4, which promotes protein stability of SUPT16H. We further demonstrated that SUPT16H-BRD4 associates with histone modification enzymes (EZH2, HDAC1) and affects histone marks (H3K9me3, H3K27me3 and H3ac). BRD4 is known to profoundly regulate interferon (IFN) signaling, while such function of SUPT16H has never been explored. Surprisingly, our results revealed that SUPT16H genetic knockdown via RNAi or pharmacological inhibition by using its inhibitor, curaxin 137 (CBL0137), results in the induction of IFNs and interferon-stimulated genes (ISGs). Through this mechanism, CBL0137 is shown to efficiently inhibit infection of multiple viruses, including Zika, influenza, and SARS-CoV-2. Furthermore, we demonstrated that CBL0137 also causes the remarkable activation of IFN signaling in natural killer (NK) cells, which promotes the NK-mediated killing of virus-infected cells in a co-culture system using human primary NK cells. Overall, our studies unraveled the previously un-appreciated role of FACT complex in regulating IFN signaling in both epithelial and NK cells, and also proposed the novel application of CBL0137 to treat viral infections.

14.
Insect Sci ; 2021 Apr 16.
Artigo em Inglês | MEDLINE | ID: mdl-33860620

RESUMO

With the wide application of genome editing in insects, a simple and efficient identification method is urgently needed to meet the increasing demand for mutation detection. Here, taking migratory locusts as a model system, we developed a non-invasive method to accurately identify genome-edited mutants by using DNA from insect exuviae. We compared the quantity and quality of genomic DNA from exuviae in five instar hoppers and found that the 1st instar exuviae had the highest DNA yield and content, while the 3rd instar exuviae had the best quality. Consensus genotypes were identified from genomic DNA of hoppers at different developmental stages in the same individuals. Moreover, we demonstrated that the amplification products from DNA extracted from locust exuviae are the consensus sequences with those from the hemolymph and foreleg pre-tarsus. Therefore, non-invasive samples provide the same genotyping results as minimally invasive and invasive samples of the same individuals. Furthermore, this identification method that uses genomic DNA from exuviae can be used for early screening of positive genome-edited individuals in each generation for adult crossing. In our study, the non-invasive identification method was not only simpler and provided results earlier than existing methods, but also had a better reproducibility and accuracy. This non-invasive identification approach using genomic DNA from exuviae can be adapted to meet the growing demand for genetic analysis and will find wide application in insect genome editing research.

15.
J Orthop Surg Res ; 16(1): 279, 2021 Apr 26.
Artigo em Inglês | MEDLINE | ID: mdl-33902663

RESUMO

BACKGROUND: Curculigoside is a natural phenolic glycoside compound produced by Curculigo orchioides Gaertn. This study aimed to explore the effects of curculigoside in promoting the osteogenic differentiation of adipose-derived stem cells (ADSCs) as well as the underlying mechanism. METHODS: ADSCs were treated with curculigoside at different concentrations (0 µmol/L, 1 µmol/L, 2.5 µmol/L, 5 µmol/L, 10 µmol/L, and 20 µmol/L), and cell viability was assessed by CCK-8 assay. Then, the alkaline phosphatase (ALP) activity was determined, and alizarin red S (ARS) staining was performed to measure the extracellular mineralization of curculigoside. Information about protein-chemical interactions is provided by the search tool for interactions of chemicals (STITCH) database. Then, LY294002 was administered to explore the mechanism by which curculigoside promotes the osteogenic differentiation of ADSCs. Western blot assays were performed to assess changes in the expression of osteogenic-related markers and the phosphorylation of PI3K and AKT. Finally, we established an ovariectomized (OVX)-induced osteoporosis mouse model and administered curculigoside to explore the effects of curculigoside in preventing bone loss in vivo. RESULTS: The CCK-8 assay indicated that curculigoside did not induce cytotoxicity at a concentration of 5 µmol/L after 48 h. The ALP and ARS results revealed that the induced group had higher ALP activity and calcium deposition than the control group. Moreover, the curculigoside group exhibited increased biomineralization, ALP activity, and ARS staining compared to the induced and control groups, and these effects were partially inhibited by LY294002. Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analysis indicated that the target genes of curculigoside were mainly involved in the PI3K-Akt signaling pathway. PCR and western blot analysis showed that the expression of RUNX2, ALP, and Osterix was upregulated in curculigoside-treated ADSCs, but this effect was partially reversed by the PI3K inhibitor LY294002. Moreover, the curculigoside-treated group exhibited significantly increased phosphorylation of AKT to P-AKT compared with the osteogenic induction group. After treatment with curculigoside, the mice had a higher bone volume than the OVX mice, suggesting partial protection from cancellous bone loss. In addition, when LY294002 was added, the protective effects of curculigoside could be neutralized. CONCLUSIONS: Curculigoside could induce the osteogenic differentiation of ADSCs and prevent bone loss in an OVX model through the PI3K/Akt signaling pathway.

16.
Artigo em Inglês | MEDLINE | ID: mdl-33909563

RESUMO

The task of video object segmentation is a fundamental but challenging problem in the field of computer vision. To deal with large variations in target objects and background clutter, we propose an online adaptive video object segmentation (VOS) framework, named Meta-VOS, that learns to adapt the target-specific segmentation. Meta-VOS builds an online adaptive learning process by exploiting cumulative expertise after searching for confidence patterns across different videos/frames, and then dynamically improves the model learning from two aspects: Meta-seg learner (i.e., module updating) and Meta-seg criterion (i.e., rule of expertise). As our goal is to rapidly determine which patterns best represent the essential characteristics of specific targets in a video, Meta-seg learner is introduced to adaptively learn to update the parameters and hyperparameters of segmentation network in very few gradient descent steps. Furthermore, a Meta-seg criterion of learned expertise, which is constructed to evaluate the Meta-seg learner for the online adaptation of the segmentation network, can confidently online update positive/negative patterns under the guidance of motion cues, object appearances and learned knowledge. Comprehensive evaluations on several benchmark datasets demonstrate the superiority of our proposed Meta-VOS when compared with other state-of-the-art methods applied to the VOS problem.

17.
Metab Eng ; 66: 157-166, 2021 Apr 03.
Artigo em Inglês | MEDLINE | ID: mdl-33823272

RESUMO

The chain length (CL) of fatty acids (FAs) is pivotal to oil property, yet to what extent it can be customized in industrial oleaginous microalgae is unknown. In Nannochloropsis oceanica, to modulate long-chain FAs (LCFAs), we first discovered a fungi/bacteria-originated polyketide synthase (PKS) system which involves a cytoplasmic acyl-ACP thioesterase (NoTE1). NoTE1 hydrolyzes C16:0-, C16:1- and C18:1-ACP in vitro and thus intercepts the specific acyl-ACPs elongated by PKS for polyunsaturated FA biosynthesis, resulting in elevation of C16/C18 monounsaturated FAs when overproduced and increase of C20 when knocked out. For medium-chain FAs (MCFAs; C8-C14), C8:0 and C10:0 FAs are boosted by introducing a Cuphea palustris acyl-ACP TE (CpTE), whereas C12:0 elevated by rationally engineering CpTE enzyme's substrate-binding pocket to shift its CL preference towards C12:0. A mechanistic model exploiting both native and engineered PKS and type II FAS pathways was thus proposed for manipulation of carbon distribution among FAs of various CL. The ability to tailor FA profile at the unit CL resolution from C8 to C20 in Nannochloropsis spp. lays the foundation for scalable production of designer lipids via industrial oleaginous microalgae.

18.
Sci Rep ; 11(1): 8529, 2021 04 20.
Artigo em Inglês | MEDLINE | ID: mdl-33879822

RESUMO

This study aimed to determine the levels of health-related behaviours (physical activity, screen exposure and sleep status) among Chinese students from primary, secondary and high schools during the pandemic of COVID-19, as well as their changes compared with their status before the pandemic. A cross-sectional online survey of 10,933 students was conducted among 10 schools in Guangzhou, China, between 8th and 15th March, 2020. After getting the informed consent from student's caregivers, an online questionnaire was designed and used to obtain time spending on health-related behaviours during the pandemic of COVID-19, as well as the changes compared with 3 months before the pandemic, which was completed by students themselves or their caregivers. Students were stratified by regions (urban, suburban, exurban), gender (boys and girls), and grades (lower grades of primary school, higher grades of primary schools, secondary schools and high schools). Data were expressed as number and percentages and Chi-square test was used to analyse difference between groups. Overall, the response rate of questionnaire was 95.3% (10,416/10,933). The median age of included students was 13.0 (10.0, 16.0) years and 50.1% (n = 5,219) were boys. 41.4%, 53.6% and 53.7% of total students reported less than 15 min per day in light, moderate and vigorous activities and 58.7% (n = 6,113) reported decreased participation in physical activity compared with the time before pandemic. Over 5 h of screen time spending on online study was reported by 44.6% (n = 4,649) of respondents, particular among high school students (81.0%). 76.9% of students reported increased screen time compared with the time before pandemic. Inadequate sleep was identified among 38.5% of students and the proportion was highest in high school students (56.9%). Our study indicated that, during the COVID-19 pandemic, the school closure exerted tremendous negative effects on school-aged children's health habits, including less physical activity, longer screen exposure and irregular sleeping pattern.


Assuntos
/epidemiologia , Exercício Físico/psicologia , Tempo de Tela , Privação do Sono/epidemiologia , Estudantes/psicologia , Adolescente , Criança , China/epidemiologia , Estudos Transversais , Feminino , Humanos , Masculino , Pandemias , Inquéritos e Questionários
19.
Biotechnol Bioeng ; 2021 Apr 03.
Artigo em Inglês | MEDLINE | ID: mdl-33811654

RESUMO

The integration of a bile drainage structure into engineered liver tissues is an important issue in the advancement of liver regenerative medicine. Primary biliary cells, which play a vital role in bile metabolite accumulation, are challenging to obtain in vitro because of their low density in the liver. In contrast, large amounts of purified hepatocytes can be easily acquired from rodents. The in vitro chemically induced liver progenitors (CLiPs) from primary mature hepatocytes offer a platform to produce biliary cells abundantly. Here, we generated a functional CLiP-derived tubular bile duct-like structure using the chemical conversion technology. We obtained an integrated tubule-hepatocyte tissue via the direct coculture of hepatocytes on the established tubular biliary-duct-like structure. This integrated tubule-hepatocyte tissue was able to transport the bile, as quantified by the cholyl-lysyl-fluorescein assay, which was not observed in the un-cocultured structure or in the biliary cell monolayer. Furthermore, this in vitro integrated tubule-hepatocyte tissue exhibited an upregulation of hepatic marker genes. Together, these findings demonstrated the efficiency of the CLiP-derived tubular biliary-duct-like structures regarding the accumulation and transport of bile.

20.
Biol Res ; 54(1): 7, 2021 Mar 02.
Artigo em Inglês | MEDLINE | ID: mdl-33653412

RESUMO

BACKGROUND: Leaves of the natural plant lotus are used in traditional Chinese medicine and tea production. They are rich in flavonoids. METHODS: In this study, lotus leaf flavonoids (LLF) were applied to human lung cancer A549 cells and human small cell lung cancer cells H446 in vitro to verify the effect of LLF on apoptosis in these cells through the ROS/p38 MAPK pathway. RESULTS: LLF had no toxic effect on normal cells at concentrations up to 500 µg/mL, but could significantly inhibit the proliferation of A549 cells and H446 cells. Flow cytometry showed that LLF could induce growth in A549 cells. We also found that LLF could increase ROS and MDA levels, and decrease SOD activity in A549 cells. Furthermore, qRT-PCR and western blot analyses showed that LLF could upregulate the expression of p38 MAPK (p-p38 MAPK), caspase-3, caspase-9, cleaved caspase-3, cleaved caspase-9 and Bax and downregulate the expression of Cu/Zn SOD, CAT, Nrf2, NQO1, HO-1, and Bcl-2 in A549 cells. Results of HPLC showed that LLF mainly contain five active substances: kaempferitrin, hyperoside, astragalin, phloridzin, and quercetin. The apoptosis-inducing effect of LLF on A549 cells came from these naturally active compounds. CONCLUSIONS: We have shown in this study that LLF is a bioactive substance that can induce apoptosis in A549 cells in vitro, and merits further research and development.


Assuntos
Apoptose/efeitos dos fármacos , Flavonoides/farmacologia , Lotus/química , Neoplasias Pulmonares/patologia , Espécies Reativas de Oxigênio/metabolismo , Proteínas Quinases p38 Ativadas por Mitógeno/metabolismo , Células A549 , Proliferação de Células , Humanos , Neoplasias Pulmonares/tratamento farmacológico , Compostos Fitoquímicos/farmacologia , Folhas de Planta/química , Transdução de Sinais/efeitos dos fármacos
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