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1.
Opt Lett ; 47(15): 3732-3735, 2022 Aug 01.
Artigo em Inglês | MEDLINE | ID: mdl-35913301

RESUMO

Accurate identification and quantification of microvascular patterns are important for clinical diagnosis and therapeutic monitoring using optical-resolution photoacoustic microscopy (OR-PAM). Due to its limited depth of field, conventional OR-PAM may not fully reveal microvascular patterns with enough details in depth range, which affects the segmentation and quantification. Here, we propose a robust vascular quantification approach via combining multi-focus image fusion with enhancement filtering (MIFEF). The multi-focus image fusion is constructed based on multi-scale gradients and image matting to improve image fusion quality by considerably achieving accurate focus measurement for initial segmentation as well as decision map refinement. The enhancement filtering identifies the vessels and handles noise without deforming microvasculature. The performance of the MIFEF were evaluated employing a leaf phantom, mouse livers and brains. The proposed method for OR-PAM can significantly facilitate the clinical provision of optical biopsy of vascular-related diseases.


Assuntos
Microscopia , Técnicas Fotoacústicas , Animais , Aumento da Imagem , Processamento de Imagem Assistida por Computador/métodos , Camundongos , Microscopia/métodos , Microvasos , Técnicas Fotoacústicas/métodos , Análise Espectral
2.
J Nat Prod ; 85(1): 196-204, 2022 01 28.
Artigo em Inglês | MEDLINE | ID: mdl-34978808

RESUMO

Salidroside (Sal), the major active constituent of Rhodiola rosea L., is considered as a potential pro-drug with various activities; however, its role in tumor therapy is not clear. Here, we demonstrated in vitro and in vivo that Sal enhanced the inhibitory activity of doxorubicin (DOX) in drug-resistant cancer cell lines. Our results showed that combination drug treatment (Sal and DOX) significantly decreased cell proliferation, migration, and motility. Besides biological validation, a luciferase-labeled animal tumor xenograft model and bioluminescence imaging (BLI) were applied for assessing the tumor progression. Sal combined with DOX inhibited the growth of HeLa-ADR-luc cells in vivo and downregulated the DOX-induced high expression of MDR1. Also, Sal downregulated the Bcl-2, MMP-2, MMP-9, PI3K, and AKT and upregulated BAX proteins. Sal demonstrated high safety and cardiac protection activity. We discovered that Sal enhances DOX sensitivity through the regulation of PI3K/Akt/HIF-1α and DOX-induced resistance pathways. Our results suggest that Sal could be a novel chemosensitization agent for the treatment of multi-drug-resistance tumors.


Assuntos
Antibióticos Antineoplásicos/farmacologia , Doxorrubicina/farmacologia , Resistencia a Medicamentos Antineoplásicos/efeitos dos fármacos , Glucosídeos/farmacologia , Subunidade alfa do Fator 1 Induzível por Hipóxia/metabolismo , Fenóis/farmacologia , Fosfatidilinositol 3-Quinases/metabolismo , Proteínas Proto-Oncogênicas c-akt/metabolismo , Transdução de Sinais/efeitos dos fármacos , Animais , Linhagem Celular Tumoral , Humanos
3.
Opt Lett ; 43(11): 2442-2445, 2018 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-29856399

RESUMO

The method of measuring blood flow in photoacoustic microscopy usually relies on ultrasonic transducers in contact fashion, which is not favored in many applications, such as wound areas, burns, and anabrosis. Here we present a noncontact photoacoustic velocity measurement method to quantitatively map transverse blood flow based on the photoacoustic Doppler (PAD) bandwidth broadening method with an all-optical photoacoustic microscopy system. It is validated that the PAD bandwidth broadening is proportional to the transverse flow within a certain range. The transverse flow speed ranging from 0 to 5.5 mm/s, as well as sectional flow images, was obtained in the blood-mimicking flow phantoms. Furthermore, the blood flow image of the mouse ear demonstrates that the all-optical photoacoustic Doppler method can acquire the information of blood flow in vivo, which could significantly broaden the scope of applications for obtaining the blood flow velocity of the microvasculature in biomedicine.


Assuntos
Velocidade do Fluxo Sanguíneo/fisiologia , Orelha/irrigação sanguínea , Fluxometria por Laser-Doppler/métodos , Imagens de Fantasmas , Técnicas Fotoacústicas/métodos , Animais , Camundongos , Camundongos Endogâmicos BALB C , Modelos Teóricos , Imagem Óptica , Reologia/métodos , Análise Espectral
4.
Opt Lett ; 42(11): 2145-2148, 2017 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-28569867

RESUMO

Basal cell carcinoma (BCC) and melanoma (MM), with the highest morbidity and mortality, respectively, are considered as two skin cancers of concern in dermatology. Histological studies have demonstrated that vascular patterns and collagenous stroma serve as key parameters for BCC and MM classification. In this Letter, we sought to identify BCC and MM based on the dual parameters of vascular patterns and scattering structures provided by all-optically integrated photoacoustic and optical coherence tomography (AOPA/OCT). The imaging capability of the AOPA/OCT was verified by the mimic phantoms. Furthermore, in vivo characterization of vasculatures and tissue structures from BCC and MM mice were successfully achieved with high resolution. Results prove the feasibility of AOPA/OCT as a novel method to dedicate to the in vivo biopsy of skin cancers which shows new insights into the study of skin diseases in early stages.


Assuntos
Carcinoma Basocelular/diagnóstico por imagem , Melanoma/diagnóstico por imagem , Técnicas Fotoacústicas , Neoplasias Cutâneas/diagnóstico por imagem , Tomografia de Coerência Óptica/métodos , Biópsia , Humanos , Análise Espectral
5.
Foods ; 13(11)2024 May 26.
Artigo em Inglês | MEDLINE | ID: mdl-38890895

RESUMO

In the present study, four Bacteroides species that could degrade Fuzhuan brick tea polysaccharide-3 (FBTPS-3) were isolated from human feces and identified to be Bacteroides ovatus, B. uniformis, B. fragilis and B. thetaiotaomicron. The four Bacteroides species showed growth on FBTPS-3 as the carbon source, and B. ovatus showed the best capability for utilizing FBTPS-3 among the four species since B. ovatus could utilize more FBTPS-3 during 24 h fermentation. Moreover, the four Bacteroides species could metabolize FBTPS-3 and promote the production of acetic, propionic and isovaleric acids. Transcriptome analysis of B. ovatus revealed that 602 genes were up-regulated by FBTPS-3, including two carbohydrate-active enzyme clusters and four polysaccharide utilization loci (PULs). The PUL 1 contained GH28 family that could hydrolyze rhamnogalacturonan and other pectic substrates, which was in line with our previous work that rhamnose and galacturonic acid were the main component monosaccharides of FBTPS-3. Collectively, the results suggested that FBTPS-3 could be utilized by Bacteroides spp., and it might be developed as a promising prebiotic targeting Bacteroidetes in intestinal environment.

6.
Med Image Anal ; 94: 103106, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38387244

RESUMO

Deep-learning-based super-resolution photoacoustic angiography (PAA) has emerged as a valuable tool for enhancing the resolution of blood vessel images and aiding in disease diagnosis. However, due to the scarcity of training samples, PAA super-resolution models do not generalize well, especially in the challenging in-vivo imaging of organs with deep tissue penetration. Furthermore, prolonged exposure to high laser intensity during the image acquisition process can lead to tissue damage and secondary infections. To address these challenges, we propose an approach doodled vessel enhancement (DOVE) that utilizes hand-drawn doodles to train a PAA super-resolution model. With a training dataset consisting of only 32 real PAA images, we construct a diffusion model that interprets hand-drawn doodles as low-resolution images. DOVE enables us to generate a large number of realistic PAA images, achieving a 49.375% fool rate, even among experts in photoacoustic imaging. Subsequently, we employ these generated images to train a self-similarity-based model for super-resolution. During cross-domain tests, our method, trained solely on generated images, achieves a structural similarity value of 0.8591, surpassing the scores of all other models trained with real high-resolution images. DOVE successfully overcomes the limitation of insufficient training samples and unlocks the clinic application potential of super-resolution-based biomedical imaging.


Assuntos
Angiografia , Imageamento Tridimensional , Humanos , Processamento de Imagem Assistida por Computador/métodos
7.
Phys Med Biol ; 69(7)2024 Mar 21.
Artigo em Inglês | MEDLINE | ID: mdl-38394682

RESUMO

Objective. The reconstruction of three-dimensional optical imaging that can quantitatively acquire the target distribution from surface measurements is a serious ill-posed problem. Traditional regularization-based reconstruction can solve such ill-posed problem to a certain extent, but its accuracy is highly dependent ona priorinformation, resulting in a less stable and adaptable method. Data-driven deep learning-based reconstruction avoids the errors of light propagation models and the reliance on experience and a prior by learning the mapping relationship between the surface light distribution and the target directly from the dataset. However, the acquisition of the training dataset and the training of the network itself are time consuming, and the high dependence of the network performance on the training dataset results in a low generalization ability. The objective of this work is to develop a highly robust reconstruction framework to solve the existing problems.Approach. This paper proposes a physical model constrained neural networks-based reconstruction framework. In the framework, the neural networks are to generate a target distribution from surface measurements, while the physical model is used to calculate the surface light distribution based on this target distribution. The mean square error between the calculated surface light distribution and the surface measurements is then used as a loss function to optimize the neural network. To further reduce the dependence ona prioriinformation, a movable region is randomly selected and then traverses the entire solution interval. We reconstruct the target distribution in this movable region and the results are used as the basis for its next movement.Main Results. The performance of the proposed framework is evaluated with a series of simulations andin vivoexperiment, including accuracy robustness of different target distributions, noise immunity, depth robustness, and spatial resolution. The results collectively demonstrate that the framework can reconstruct targets with a high accuracy, stability and versatility.Significance. The proposed framework has high accuracy and robustness, as well as good generalizability. Compared with traditional regularization-based reconstruction methods, it eliminates the need to manually delineate feasible regions and adjust regularization parameters. Compared with emerging deep learning assisted methods, it does not require any training dataset, thus saving a lot of time and resources and solving the problem of poor generalization and robustness of deep learning methods. Thus, the framework opens up a new perspective for the reconstruction of three-dimension optical imaging.


Assuntos
Aprendizado Profundo , Processamento de Imagem Assistida por Computador , Processamento de Imagem Assistida por Computador/métodos , Redes Neurais de Computação , Imageamento Tridimensional , Imagem Óptica , Algoritmos
8.
Foods ; 13(6)2024 Mar 16.
Artigo em Inglês | MEDLINE | ID: mdl-38540894

RESUMO

Purple sweet potato (PSP) has abundant nutritional compounds, which are valuable constituents of the human diet, but its development and utilization are still in the primary processing phase. This study examined the differences in nutritional characteristics of 10 PSP varieties. A variety of nutritional components were evaluated and comprehensively compared using principal component analysis (PCA) and cluster analysis (CA). The PSP had 60.9-70.1% moisture. The dried PSP had abundant starch (43.9~67.2%) and dietary fiber (9.40~16.5%), moderate levels of protein (3.19~8.75%) and reducing sugar (1.44~4.01%), and low amounts of crude fat (0.51~1.01%). The anthocyanin profile varied significantly between the different varieties. A correlation analysis showed that a higher content of anthocyanins resulted in a darker color. The PCA and CA suggested that varieties XS, ZL, and JS18 are desirable for developing the diabetic patient's diet. JS1 had the highest anthocyanin, protein, and dietary fiber contents and the lowest starch, implying that it could be used as a source of natural colorants or functional foods. Varieties FX, GS, ES13, and EN are suitable for producing various starch-based food products, such as noodles, cookies, and pastries. This study provides a reference for the practical use and rational processing of PSP resources.

9.
Int J Biol Macromol ; 258(Pt 2): 129036, 2024 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-38151081

RESUMO

High-fat and high-fructose diet (HFFD) consumption can induce cognitive dysfunction and gut microbiota disorder. In the present study, the effects of the polysaccharides from the fruits of Lycium barbarum L. (LBPs) on HFFD-induced cognitive deficits and gut microbiota dysbiosis were investigated. The results showed that intervention of LBPs (200 mg/kg/day) for 14 weeks could significantly prevent learning and memory deficits in HFFD-fed mice, evidenced by a reduction of latency and increment of crossing parameters of platform quadrant in Morris water maze test. Moreover, oral administration of LBPs enhanced the expression of postsynaptic density protein 95 and brain-derived neurotrophic factor and reduced the activation of glial cells in hippocampus. Besides, LBPs treatment enriched the relative abundances of Allobaculum and Lactococcus and reduced the relative abundance of Proteobacteria in gut bacterial community of HFFD-fed mice, accompanied by increased levels of short-chain fatty acids (SCFAs) as well as expression of associated G protein-coupled receptors. Furthermore, LBPs intervention prevented insulin resistance, obesity and colonic inflammation. Finally, a significant correlation was observed among neuroinflammation associated parameters, gut microbiota and SCFAs through Pearson correlation analysis. Collectively, these findings suggested that the regulation of gut microbiota might be the potential mechanism of LBPs on preventing cognitive dysfunction induced by HFFD.


Assuntos
Disfunção Cognitiva , Microbioma Gastrointestinal , Lycium , Camundongos , Animais , Glicemia , Frutas , Frutose , Polissacarídeos/farmacologia , Dieta , Dieta Hiperlipídica , Camundongos Endogâmicos C57BL
10.
Carbohydr Polym ; 338: 122236, 2024 Aug 15.
Artigo em Inglês | MEDLINE | ID: mdl-38763717

RESUMO

Avicennia marina (Forssk.) Vierh. is a highly salt-tolerant mangrove, and its fruit has been traditionally used for treating constipation and dysentery. In this study, a pectin (AMFPs-0-1) was extracted and isolated from this fruit for the first time, its structure was analyzed, and the effects on the human gut microbiota were investigated. The results indicated that AMFPs-0-1 with a molecular weight of 798 kDa had a backbone consisting of alternating →2)-α-L-Rhap-(1→ and →4)-α-D-GalpA-(1→ residues and side chains composed of →3-α-L-Araf-(1→-linked arabinan with a terminal ß-L-Araf, →5-α-L-Araf-(1→-linked arabinan, and →4)-ß-D-Galp-(1→-linked galactan that linked to the C-4 positions of all α-L-Rhap residues in the backbone. It belongs to a type I rhamnogalacturonan (RG-I) pectin but has no arabinogalactosyl chains. AMFPs-0-1 could be consumed by human gut microbiota and increase the abundance of some beneficial bacteria, such as Bifidobacterium, Mitsuokella, and Megasphaera, which could help fight digestive disorders. These findings provide a structural basis for the potential application of A. marina fruit RG-I pectic polysaccharides in improving human intestinal health.


Assuntos
Avicennia , Fermentação , Frutas , Microbioma Gastrointestinal , Pectinas , Prebióticos , Pectinas/química , Frutas/química , Avicennia/química , Avicennia/microbiologia , Humanos , Microbioma Gastrointestinal/efeitos dos fármacos , Peso Molecular
11.
Int J Biol Macromol ; 229: 81-91, 2023 Feb 28.
Artigo em Inglês | MEDLINE | ID: mdl-36586650

RESUMO

Polysaccharide is one of the main active ingredients in Lonicera japonica Thunb. (L. japonica). In this study, we examined the anti-aging activities of L.japonica polysaccharides (LJPs) and further explored the mechanisms. Polysaccharides from L.japonica including the crude LJP (CLJP) and the purified fraction (LJP-2-1) were characterized. The molecular weights of CLJP and LJP-2-1 were 1450 kDa and 1280 kDa, respectively. Meanwhile, CLJP was mainly composed of galacturonic acid (23.57 %), galactose (23.45 %) and arabinose (23.45 %). LJP-2-1 was mainly composed of galacturonic acid (51.25 %) and arabinose (22.89 %). In Caenorhabditis elegans (C. elegans), LJPs maximally prolonged mean lifespan by 13.97 %, promoted fitness with increased motility by 40.92 % and pharyngeal pumping by 25.72 %, and decreased lipofuscin accumulation by 38.9 % with intact body length and fecundity. Moreover, CLJP extended the mean lifespan of nematodes under oxidative and heat stress by 16.76 % and 14.05 % respectively by activating stress-related genes and the antioxidant system. Further, CLJP required DAF-16 to prolong the lifespan of nematodes. CLJP upregulated the expression of daf-16 and its targeted downstream genes, including sod-3, gst-4 and hsp-16.2. Moreover, nuclear accumulation of DAF-16 was promoted upon CLJP treatment. Together, our data uncover the role of LJPs in extending lifespan and healthspan through DAF-16.


Assuntos
Proteínas de Caenorhabditis elegans , Lonicera , Animais , Caenorhabditis elegans/metabolismo , Longevidade , Proteínas de Caenorhabditis elegans/genética , Proteínas de Caenorhabditis elegans/metabolismo , Arabinose/metabolismo , Espécies Reativas de Oxigênio/metabolismo , Polissacarídeos/farmacologia , Polissacarídeos/metabolismo , Estresse Oxidativo , Fatores de Transcrição Forkhead/genética , Fatores de Transcrição Forkhead/metabolismo
12.
J Mater Chem B ; 11(40): 9757-9764, 2023 10 18.
Artigo em Inglês | MEDLINE | ID: mdl-37807767

RESUMO

Stimuli-responsive/smart drug delivery systems (DDSs), particularly those that use temperature as a stimuli-response factor to activate drug release, are the subject of recent research. A phase change material (PCM) is a popular thermally responsive material that can be used as a drug carrier and only when the system temperature is above the phase change point is the drug released following the phase change material changing from solid to liquid. In this study, a novel NIR light-triggered temperature-sensitive drug delivery system is developed for controllable release of acyclovir (ACV). For this purpose, a mixture of a phase change material (T38) and an ACV compound is first emulsified with copper oxide nanoparticles (CuO NPs) as a Pickering stabilizer and a photothermal conversion material, and then encapsulated with SiO2 to form a photothermal stimuli-responsive delivery system. This system shows a uniform spherical shape with a well-distinct core-shell structure, and is further experimentally proven to be able to controllably release drugs with solid-liquid transition of the phase change carrier upon temperature change. These results indicate that cumulative release of ACV can reach 51.2% at 40 °C within 20 hours, which is much higher than 27.3% release achieved below the melting point of T38. In addition, CuO NPs with excellent photothermal conversion ability endow the system with precisely controllable drug delivery via NIR light stimulation, where the cumulative drug release can reach 83.6% after 7 cycles of light stimulation, allowing controlled release at a specific time or location.


Assuntos
Doxorrubicina , Dióxido de Silício , Temperatura , Cápsulas , Doxorrubicina/química , Sistemas de Liberação de Medicamentos/métodos
13.
J Agric Food Chem ; 71(6): 2864-2882, 2023 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-36725206

RESUMO

In the present study, we found that anthocyanins from Lycium ruthenicum Murray (ACN) potently ameliorated a high-fructose diet (HFrD)-induced neuroinflammation in mice. ACN improved the integrity of the intestinal barrier and suppressed the toll-like receptor 4 (TLR4) signaling pathway to ameliorate the neuroinflammation, which was verified by Tlr4-/- mice. Furthermore, ACN could modulate the HFrD-induced dysbiosis of gut microbiota. The fecal microbiota transplantation from ACN-induced mice was sufficient to attenuate the neuroinflammation, while the amelioration of neuroinflammation by ACN was blocked upon gut microbiota depletion. In addition, ACN-induced increment of the relative abundance of Lactobacillus might be responsible for the alleviation of the neuroinflammation, which was further confirmed in the promoting effect of ACN on the growth of Lactobacillus in vitro. Overall, these results provided the evidence of a comprehensive cross-talk mechanism between ACN and neuroinflammation in HFrD-fed mice, which was mediated by reducing gut microbiota dysbiosis and maintaining the intestinal barrier integrity.


Assuntos
Antocianinas , Lycium , Animais , Camundongos , Proliferação de Células , Dieta , Disbiose/tratamento farmacológico , Disbiose/etiologia , Disbiose/metabolismo , Frutose , Lactobacillus , Camundongos Endogâmicos C57BL , Doenças Neuroinflamatórias , Receptor 4 Toll-Like
14.
Food Chem ; 403: 134477, 2023 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-36358090

RESUMO

The effects of theasinensin A (TSA) on healthy C57BL/6J mice were investigated. Results showed that long-term administration of 100 mg/kg body weight/day TSA might be non-toxic to healthy mice based on the unaltered basal biochemical indicators related to glucose and lipid metabolism, inflammatory factors and hepatic injury. On the contrary, TSA stimulated the rate of lipid turnover and browning of white adipose tissues, accelerated the adipocytic energy mobilization, and then reduced the white adipocytic size, ultimately enhancing resistance to obesity in healthy mice. Furthermore, TSA not only up-regulated the expression of mucin, tight junction protein, and short-chain fatty acids receptor, but also regulated the intestinal microbiota by enhancing the typical beneficial microbe Akkermansia muciniphila, thereby modulating the colonic microenvironment. These results suggested that TSA had a potential strengthening effect on the resistance of healthy mice to metabolic disorders, which provides a theoretical basis for the utilization of TSA.


Assuntos
Benzopiranos , Fenóis , Camundongos , Animais , Camundongos Endogâmicos C57BL , Fenóis/metabolismo , Tecido Adiposo Branco , Dieta Hiperlipídica , Tecido Adiposo/metabolismo
15.
Food Funct ; 14(11): 5311-5325, 2023 Jun 06.
Artigo em Inglês | MEDLINE | ID: mdl-37203380

RESUMO

High-fat diet (HFD) consumption can induce intestinal barrier dysfunction and disrupt glucose metabolism. Our previous studies have demonstrated that polysaccharides obtained from the fruits of Lycium barbarum L. (LBPs) could suppress acute experimental diabetes as well as colitis in mice. In the present study, the modulating effects of a purified fraction of LBPs, named LBPs-4, on glucose homeostasis and intestinal barrier function in mice fed with a HFD were investigated. Our results indicated that the oral administration of LBP-4 (200 mg per kg per day) improved hyperglycemia, glucose intolerance, insulin resistance and islet ß-cell hyperplasia in HFD-fed mice. Moreover, LBPs-4 intervention enhanced the intestinal barrier integrity by increasing the expression levels of zonula occludens 1 and claudin-1 and the number of goblet cells in the colon. LBPs-4 also modulated the composition of gut microbiota by increasing the relative abundances of butyrate producer Allobaculum and acetate producer Romboutsia. The results of fecal transplantation experiments, transferring of microbiota from LBPs-4-fed donor mice to HFD-fed recipient mice, validated the cause-effect relationship between LBPs-4-evoked changes in the gut microbiota and improvement of glucose homeostasis and intestinal barrier function. Collectively, these findings suggested that LBPs-4 might be developed as promising prebiotics to improve glucose metabolism and gut health.


Assuntos
Lycium , Camundongos , Animais , Dieta Hiperlipídica/efeitos adversos , Frutas , Polissacarídeos/farmacologia , Homeostase , Glucose , Camundongos Endogâmicos C57BL
16.
Biomed Opt Express ; 14(10): 5451-5465, 2023 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-37854561

RESUMO

Histopathology is the foundation and gold standard for identifying diseases, and precise quantification of histopathological images can provide the pathologist with objective clues to make a more convincing diagnosis. Optical microscopy (OM), an important branch of optical imaging technology that provides high-resolution images of tissue cytology and structural morphology, has been used in the diagnosis of histopathology and evolved into a new disciplinary direction of optical microscopic histopathology (OMH). There are a number of ex-vivo studies providing applicability of different OMH approaches, and a transfer of these techniques toward in vivo diagnosis is currently in progress. Furthermore, combined with advanced artificial intelligence algorithms, OMH allows for improved diagnostic reliability and convenience due to the complementarity of retrieval information. In this review, we cover recent advances in OMH, including the exploration of new techniques in OMH as well as their applications, and look ahead to new challenges in OMH. These typical application examples well demonstrate the application potential and clinical value of OMH techniques in histopathological diagnosis.

17.
J Adv Res ; 50: 35-54, 2023 08.
Artigo em Inglês | MEDLINE | ID: mdl-36341987

RESUMO

INTRODUCTION: Fluoride is widely presented in drinking water and foods. A strong relation between fluoride exposure and obesity has been reported. However, the potential mechanisms on fluoride-induced obesity remain unexplored. Objectives and methods The effects of fluoride on the obesity were investigated using mice model. Furthermore, the role of gut homeostasis in exacerbation of the obesity induced by fluoride was evaluated. Results The results showed that fluoride alone did not induce obesity in normal diet (ND) fed mice, whereas, it could trigger exacerbation of obesity in high-fat diet (HFD) fed mice. Fluoride impaired intestinal barrier and activated Toll-like receptor 4 (TLR4) signaling to induce obesity, which was further verified in TLR4-/- mice. Furthermore, fluoride could deteriorate the gut microbiota in HFD mice. The fecal microbiota transplantation from fluoride-induced mice was sufficient to induce obesity, while the exacerbation of obesity by fluoride was blocked upon gut microbiota depletion. The fluoride-induced bloom of Erysipelatoclostridium ramosum was responsible for exacerbation of obesity. In addition, a potential strategy for prevention of fluoride-induced obesity was proposed by intervention with polysaccharides from Fuzhuan brick tea. Conclusion Overall, these results provide the first evidence of a comprehensive cross-talk mechanism between fluoride and obesity in HFD fed mice, which is mediated by gut microbiota and intestinal barrier. E. ramosum was identified as a crucial mediator of fluoride induced obesity, which could be explored as potential target for prevention and treatment of obesity with exciting translational value.


Assuntos
Fluoretos , Receptor 4 Toll-Like , Animais , Camundongos , Fluoretos/farmacologia , Dieta Hiperlipídica/efeitos adversos , Obesidade/prevenção & controle
18.
Foods ; 11(3)2022 Jan 24.
Artigo em Inglês | MEDLINE | ID: mdl-35159457

RESUMO

The fruits of Lycium barbarum are rich in flavonoids, which may contribute to the health-promoting function of Lycium barbarum. However, the composition of flavonoids in the fruits of Lycium barbarum (LBFs) has received little attention. Thus, the goal of this work was to identify more kinds of flavonoids from fruits of Lycium barbarum by liquid chromatography-mass spectrometry. The potential antioxidant and anti-inflammatory activities of LBFs in vitro were also investigated. Thirteen flavonoid compounds were identified in LBFs, of which daphnetin, 6,7-dihydroxycoumarin, astragalin, taxifolin, eriodictyol, naringenin, and chrysoeriol were identified for the first time in the fruits of Lycium barbarum, which greatly enriched the variety of flavonoids in the fruits of Lycium barbarum. LBFs showed a similar superior antioxidant activity to vitamin C. Furthermore, LBFs exhibited an anti-inflammatory activity by suppressing the production of nitric oxide and pro-inflammatory cytokines, including tumor necrosis factor-alpha, interleukin-1ß, and interleukin-6, in lipopolysaccharide-treated RAW264.7 macrophage cells. This study demonstrated the potential development of LBFs as functional foods.

19.
Food Chem ; 389: 133081, 2022 Sep 30.
Artigo em Inglês | MEDLINE | ID: mdl-35490526

RESUMO

Chlorogenic acids are important phenolics in the fruits of wolfberry, but little attention has been paid on their glucosylated forms. In the present study, a glucosylated form of chlorogenic acid was isolated from the fruits of Lycium barbarum L. var. auranticarpum K. F. Ching (also called yellow wolfberry) and identified to be (-)-5-O-(3-O-ß-d-glucopyranosylcaffeoyl)-quinic acid (5-CQA-3'ßG) by high resolution mass spectrometry and nuclear magnetic resonance spectrometry. The content of 5-CQA-3'ßG in the dried fruit was determined as 0.0293 ± 0.0015% by HPLC. In addition, 5-CQA-3'ßG showed a good scavenging capacity for 2,2'-azino-bis-(3-ethylben-zothiazoline-6-sulphonate) free radicals but had a relatively low reducing power and scavenging capacity for 2,2-diphenyl-1-picrylhydrazyl free radical. Moreover, the secretion of nitric oxide, tumor necrosis factor-α and interleukin-6 as well as related mRNA expression were reduced in lipopolysaccharide-stimulated RAW264.7 macrophage cells treated with 5-CQA-3'ßG. This is the first report describing purification, identification and bioactivity of glucosylated CQA from yellow wolfberry.


Assuntos
Lycium , Antioxidantes/química , Ácido Clorogênico/análise , Radicais Livres/análise , Frutas/química , Lycium/química , Ácido Quínico/análise , Ácido Quínico/farmacologia
20.
Food Chem ; 391: 133203, 2022 Oct 15.
Artigo em Inglês | MEDLINE | ID: mdl-35597036

RESUMO

The purified fraction 3 of polysaccharides from Fuzhuan brick tea (FBTPS-3) could attenuate the colitis and modulate the gut microbiota. However, the relationship between anti-inflammatory effect of FBTPS-3 and the gut microbiota is still unknown. Thus, the anaerobic fermentation in vitro was used to investigate the potential mechanism. FBTPS-3 could be utilized and degraded by gut microbiota from inflammatory bowel disease (IBD) subjects. Furthermore, FBTPS-3 could modulate the composition and structure of IBD gut microbiota toward to that of healthy group. FBTPS-3 showed a superior modulated effect on IBD gut microbiota by increasing Bacteroides and decreasing Escherichia/Shigella. Furthermore, the fermentation solution rather than FBTPS-3 itself showed anti-inflammatory effects on lipopolysaccharide-treated RAW264.7 macrophages, which might be due to the metabolites such as short-chain fatty acids (SCFAs). Thus, FBTPS-3 can be expected as novel prebiotics for treatment of IBD via modulating gut microbiota, and promoting the production of SCFAs.


Assuntos
Colite , Microbioma Gastrointestinal , Doenças Inflamatórias Intestinais , Anti-Inflamatórios/farmacologia , Colite/induzido quimicamente , Colite/tratamento farmacológico , Ácidos Graxos Voláteis/metabolismo , Fermentação , Humanos , Doenças Inflamatórias Intestinais/tratamento farmacológico , Polissacarídeos/química , Polissacarídeos/farmacologia , Chá/química
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