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1.
Nature ; 606(7912): 94-101, 2022 06.
Artigo em Inglês | MEDLINE | ID: mdl-35650358

RESUMO

Neurotransmitters play essential roles in regulating neural circuit dynamics both in the central nervous system as well as at the peripheral, including the gastrointestinal tract1-3. Their real-time monitoring will offer critical information for understanding neural function and diagnosing disease1-3. However, bioelectronic tools to monitor the dynamics of neurotransmitters in vivo, especially in the enteric nervous systems, are underdeveloped. This is mainly owing to the limited availability of biosensing tools that are capable of examining soft, complex and actively moving organs. Here we introduce a tissue-mimicking, stretchable, neurochemical biological interface termed NeuroString, which is prepared by laser patterning of a metal-complexed polyimide into an interconnected graphene/nanoparticle network embedded in an elastomer. NeuroString sensors allow chronic in vivo real-time, multichannel and multiplexed monoamine sensing in the brain of behaving mouse, as well as measuring serotonin dynamics in the gut without undesired stimulations and perturbing peristaltic movements. The described elastic and conformable biosensing interface has broad potential for studying the impact of neurotransmitters on gut microbes, brain-gut communication and may ultimately be extended to biomolecular sensing in other soft organs across the body.


Assuntos
Encéfalo , Sistema Nervoso Entérico , Trato Gastrointestinal , Neurotransmissores , Animais , Técnicas Biossensoriais , Encéfalo/metabolismo , Eixo Encéfalo-Intestino , Elastômeros , Sistema Nervoso Entérico/metabolismo , Trato Gastrointestinal/inervação , Trato Gastrointestinal/fisiologia , Grafite , Lasers , Camundongos , Nanopartículas , Neurotransmissores/análise , Serotonina/análise
2.
Nano Lett ; 23(23): 11193-11202, 2023 Dec 13.
Artigo em Inglês | MEDLINE | ID: mdl-38039401

RESUMO

The topically administered glaucoma medications usually encounter serious precorneal drug loss and low corneal penetration, leading to a low bioavailability. In addition, due to the complexity of glaucoma etiology, a single medication is often insufficient. In this work, we report a novel dendritic oligoethylenimine decorated liposome for codelivery of two antiglaucoma drugs, latanoprost and timolol. The liposome showed a uniform nanoscopic particle size, positive surface charge, and excellent dual-drug loading capacity. A prolonged precorneal retention is observed by using this liposomal delivery system. This liposomal delivery system presents increased cellular uptake and tight junctions opening capacity, contributing respectively to the transcellular and paracellular permeation, thereby enhancing the trans-corneal transportation. Following topical administration of one eye drop in brown Norway rats, the dual-drug-loaded liposome formulation resulted in a sustained and effective intraocular pressure reduction as long as 5 days, without inducing ocular inflammation, discomfort, and tissue damage.


Assuntos
Glaucoma , Lipossomos , Ratos , Animais , Lipossomos/uso terapêutico , Agentes Antiglaucoma , Glaucoma/tratamento farmacológico , Timolol/farmacologia , Timolol/uso terapêutico , Administração Tópica , Sistemas de Liberação de Medicamentos
3.
Mikrochim Acta ; 191(1): 18, 2023 12 13.
Artigo em Inglês | MEDLINE | ID: mdl-38087124

RESUMO

An efficient method is presented for simultaneous enantioselective determination of three chiral triazole fungicides (namely paclobutrazol, hexaconazole, and diniconazole) in water samples by DSPE-HPLC-UV. The perfect chiral separation of the enantiomers was achieved on a Chiralpak IH column within 15 min. In order to adsorb and enrich the analytes from water matrices, a cross-linked hydroxypropyl ß-cyclodextrin polymer was synthesized. The prepared material exhibited good adsorption capacity, which was assessed by adsorption kinetic and adsorption thermodynamic experiments. One-variable-at-a-time and the response surface methodology were used to optimize the extraction parameters. Under the optimum sample preparation conditions, good linearity (2.0 ~ 800 µg L-1, R2 ≥ 0.9978), detection limits (0.6 to 1.0 µg L-1), quantitation limits (2.0 to 3.2 µg L-1), recoveries (86.7 ~ 105.8%), and the relative standard deviation (intra-day RSD ≤ 3.7%, inter-day RSD ≤ 5.1%) were obtained, satisfying the requirements of pesticides residues determination. These results demonstrated that the proposed method was applicable for routine determination of chiral triazole fungicide residues in water samples.


Assuntos
Fungicidas Industriais , beta-Ciclodextrinas , Fungicidas Industriais/análise , Água/química , Polímeros , Estereoisomerismo , Triazóis/análise , Extração em Fase Sólida/métodos
4.
Int J Mol Sci ; 24(9)2023 Apr 24.
Artigo em Inglês | MEDLINE | ID: mdl-37175492

RESUMO

Herein, a series of novel sulfur-containing functionalized disiloxanes based on a low-cost and commercially available material, i.e., 1,3-bis(3-glycidoxypropyl)-1,1,3,3-tetramethyldisiloxane, and various thiol compounds were prepared by thiol-epoxy click reaction. It was found that both lithium hydroxide (LiOH) and tetrabutylammonium fluoride (TBAF) have high catalytic activity after optimizing the reaction condition, and the reaction can be carried out with high yields, excellent regioselectivity, mild reaction condition, and good tolerance of functional groups. These compounds exhibit excellent nonconventional fluorescence due to the formation of coordination bonds between Si atoms and heteroatoms (e.g., S or N) and can emit blue fluorescence upon ultraviolet (UV) irradiation. These results demonstrate that the thiol-epoxy click reaction could promisingly act as an efficient organosilicon synthetic methodology to construct various organosilicon materials with novel structures and functionality, and thus their application scope will be significantly expanded.


Assuntos
Silanos , Compostos de Sulfidrila , Compostos de Sulfidrila/química , Fluorescência , Resinas Epóxi , Enxofre
5.
Anal Chem ; 94(43): 14854-14860, 2022 11 01.
Artigo em Inglês | MEDLINE | ID: mdl-36260062

RESUMO

The ionophore properties of four kinds of N-alkyl/aryl ammonium resorcinarenes and extended-resorcinarenes were inspected for the first time to fabricate polymeric membrane electrodes for determination of biologically relevant pyrophosphate (PPi) and lysophosphatidic acid (LPA). The proposed ion selective electrodes (ISEs) showed significant preference for PPi and LPA with significant selectivity pattern differences from the Hofmeister series. To gain further insight into the performances of the developed ISEs, the binding constants of ionophore-anion complexes in the plasticized membrane phase were investigated, along with the optimized geometries and calculated electrostatic potential. Nernstian potential responses with good reversibility to target anions can be observed when shifting the optimized membranes in aqueous solutions in the concentration range from 10-6.5 to 10-2.3/10-2.2 M. Moreover, potentiometric sensings of PPi and LPA in mineral water and artificial serum were achieved in low µM concentration range, demonstrating their promising real-world applications. These results provide a promising avenue for the development of polymeric membrane electrodes for biological relevant anions and will broaden the scope of potentiometric sensing.


Assuntos
Compostos de Amônio , Difosfatos , Ionóforos/química , Membranas Artificiais , Potenciometria/métodos , Eletrodos Seletivos de Íons , Ânions/química , Polímeros/química
6.
Clin Oral Investig ; 26(3): 2465-2478, 2022 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-34622310

RESUMO

OBJECTIVES: The objective of this study was to examine the association between the oral microbiome and pregnancy outcomes, specifically healthy or preterm low birth weight (PLBW) in individuals with and without periodontal disease (PD). MATERIAL AND METHODS: In this prospective clinical trial, we recruited 186 pregnant women, 17 of whom exhibited PD and delivered PLBW infants (PD-PLBW group). Of the remaining women, 155 presented PD and delivered healthy infants; 18 of these subjects with similar periodontal condition and age matched to the PD-PLBW group, and they became the PD-HD group. From the total group, 11 women exhibited healthy gingiva and had a healthy delivery (HD) and healthy infants (H-HD group), and 3 exhibited healthy gingiva and delivered PLBW infants (H-PLBW group). Periodontal parameters were recorded, and subgingival plaque and serum were collected during 26-28 gestational weeks. For the plaque samples, microbial abundance and diversity were accessed by 16S rRNA sequencing. RESULTS: Women with PD showed an enrichment in the genus Porphyromonas, Treponema, and Filifactor, whereas women with healthy gingiva showed an enrichment in Streptococcus, Actinomyces, and Corynebacterium, independently of the birth status. Although no significant difference was found in the beta diversity between the 4 groups, women that had PLBW infants presented a significantly lower abundance of the genus Neisseria, independently of PD status. CONCLUSION: Lower levels of Neisseria align with preterm low birth weight in pregnant women, whereas a higher abundance of Treponema, Porphyromonas, Fretibacterium, and Filifactor and a lower abundance of Streptococcus may contribute to periodontal disease during pregnancy. CLINICAL RELEVANCE: The oral commensal Neisseria have potential in the prediction of PLBW.


Assuntos
Microbiota , Nascimento Prematuro , Feminino , Humanos , Lactente , Recém-Nascido de Baixo Peso , Recém-Nascido , Neisseria , Gravidez , Resultado da Gravidez , RNA Ribossômico 16S
7.
J Oral Rehabil ; 49(2): 228-236, 2022 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-34398484

RESUMO

BACKGROUND: Dental pulp tissues are rich in pain-related afferent nerve fibers, which originate from primary sensory neurons in the trigeminal ganglion (TG). The mechanisms of central nervous system (CNS) underlying ectopic pain following peripheral inflammation have been reported that the macrophages as inflammatory and immunologic mediators in the TG play an important role in the process of pulpitis and hyperalgesia. OBJECTIVE(S): To observe the polarization response and dynamic distribution of macrophages in the TG during the development of dental pulp inflammation. METHODS: A rat model of pulpitis was established using complete Freund's adjuvant (CFA). Hematoxylin-eosin (HE), immunohistochemistry (IHC), immunofluorescence (IF), toluidine blue (TB) staining, and RT-qPCR were performed to observe the expression of macrophage-related factors in the TG. RESULTS: The results of IHC staining showed that M2 macrophages labeled with CD206 were observed in the TG of both the control and CFA groups. The statistical analysis indicated that the number of CD206-positive macrophages in the TG increased significantly at 24 h after CFA-induced pulpitis, reached a peak at 2 weeks, and then returned to the normal level after 6 weeks. The ratio of M2/M1 in the CFA groups was significantly lower than that in the control group from 24 to 72 h, and this pattern was reversed at 2 weeks after CFA-induced pulpitis; then, the ratio increased significantly and was maintained at a high level for 4 weeks. RT-qPCR results showed that the expression of IL-10 in the TG increased significantly from 1 to 4 weeks after CFA-induced pulpitis. CONCLUSION: The trend of M2 macrophages was opposite to that of M1 macrophages in the TG during the process of pulpitis induced by CFA, which is consistent with the expression of macrophage-related cytokines. Macrophage polarization in the TG may participate in the neuroinflammation response induced by dental pulpitis.


Assuntos
Pulpite , Gânglio Trigeminal , Animais , Macrófagos , Doenças Neuroinflamatórias , Ratos , Ratos Sprague-Dawley
8.
J Nanobiotechnology ; 19(1): 309, 2021 Oct 09.
Artigo em Inglês | MEDLINE | ID: mdl-34627291

RESUMO

BACKGROUND: Skin wound healing remains a considerable clinical challenge, thus stressing the urgent need for the development of new interventions to promote repair. Recent researches indicate that both peptides and nanoparticles may be potential therapies for the treatment of skin wounds. METHODS: In the current study, the mesoporous polydopamine (MPDA) nanoparticles were prepared and the peptide RL-QN15 that was previously identified from amphibian skin secretions and exhibited significant potential as a novel prohealing agent was successfully loaded onto the MPDA nanoparticles, which was confirmed by results of analysis of scanning electron microscopy and fourier transform infrared spectroscopy. The encapsulation efficiency and sustained release rate of RL-QN15 from the nanocomposites were determined. The prohealing potency of nanocomposites were evaluated by full-thickness injured wounds in both mice and swine and burn wounds in mice. RESULTS: Our results indicated that, compared with RL-QN15 alone, the prohealing potency of nanocomposites of MPDA and RL-QN15 in the full-thickness injured wounds and burn wounds in mice was increased by up to 50 times through the slow release of RL-QN15. Moreover, the load on the MPDA obviously increased the prohealing activities of RL-QN15 in full-thickness injured wounds in swine. In addition, the obvious increase in the prohealing potency of nanocomposites of MPDA and RL-QN15 was also proved by the results from histological analysis. CONCLUSIONS: Based on our knowledge, this is the first research to report that the load of MPDA nanoparticles could significantly increase the prohealing potency of peptide and hence highlighted the promising potential of MPDA nanoparticles-carrying peptide RL-QN15 for skin wound therapy.


Assuntos
Fármacos Dermatológicos , Indóis , Nanopartículas/química , Peptídeos , Polímeros , Cicatrização/efeitos dos fármacos , Animais , Fármacos Dermatológicos/química , Fármacos Dermatológicos/farmacocinética , Fármacos Dermatológicos/farmacologia , Indóis/química , Indóis/farmacocinética , Indóis/farmacologia , Masculino , Camundongos , Peptídeos/química , Peptídeos/farmacocinética , Peptídeos/farmacologia , Polímeros/química , Polímeros/farmacocinética , Polímeros/farmacologia , Pele/química , Pele/lesões , Pele/metabolismo , Suínos
9.
Int J Med Sci ; 17(17): 2663-2672, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33162794

RESUMO

Impacted third molars are commonly seen in teenagers and young adults and can cause considerable suffering. Preventing eruption of the third molars can reduce pain at the source. Our previous study has shown that dexamethasone (DEX) at a certain concentration can prevent the eruption of third molars without damaging alveolar bone in Sprague-Dawley (SD) rats, but the relevant molecular mechanisms need to be explored. This study aimed to explore the effects of high concentrations of DEX on osteogenic signaling pathways, including BMP/Smad and Wnt/ß-catenin pathways, in rat dental follicle cells (rDFCs) and to elucidate the possible mechanisms. The results showed that BMP7 induced osteogenic differentiation by increasing the activity of ALP and the protein levels of OPN in rDFCs. DEX decreased endogenous BMP7 and phosphorylated Smad1/5/8 expression as well as BMP7-induced osteogenic differentiation. DEX also reduced the mRNA and protein levels of ß-catenin by enhancing the expression of GSK-3ß. In addition, regardless of DEX intervention, overexpression of BMP7 promoted the expression of ß-catenin, while knockdown of BMP7 attenuated it. Further investigation revealed that overexpression of BMP7 attenuated the DEX-mediated inhibition of AKT and GSK-3ß phosphorylation, but knockdown of BMP7 exerted the opposite effects. This study suggests that high concentrations of DEX may inhibit the expression of ß-catenin via the PI3K/AKT/GSK-3ß pathway in a manner mediated by BMP7. The findings further illustrate the possible molecular mechanisms by which DEX prevents tooth development.


Assuntos
Proteína Morfogenética Óssea 7/metabolismo , Dexametasona/farmacologia , Osteogênese/efeitos dos fármacos , Erupção Dentária/efeitos dos fármacos , Dente Impactado/prevenção & controle , Animais , Diferenciação Celular/efeitos dos fármacos , Células Cultivadas , Saco Dentário/citologia , Dexametasona/uso terapêutico , Células Epiteliais , Glicogênio Sintase Quinase 3 beta/metabolismo , Humanos , Masculino , Dente Molar/crescimento & desenvolvimento , Fosfatidilinositol 3-Quinases/metabolismo , Cultura Primária de Células , Proteínas Proto-Oncogênicas c-akt/metabolismo , Ratos , Transdução de Sinais/efeitos dos fármacos , beta Catenina/metabolismo
10.
Chirality ; 29(3-4): 147-154, 2017 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-28349560

RESUMO

Separations of six dihydropyridine enantiomers on three commercially available cellulose-based chiral stationary phases (Chiralcel OD-RH, Chiralpak IB, and Chiralpak IC) were evaluated with high-performance liquid chromatography (HPLC). The best enantioseparation of the six chiral drugs was obtained with a Chiralpak IC (250 × 4.6 mm i.d., 5 µm) column. Then the influence of the mobile phase including an alcohol-modifying agent and alkaline additive on the enantioseparation were investigated and optimized. The optimal mobile phase conditions and maximum resolution for every analyte were as follows respectively: n-hexane/isopropanol (85:15, v/v) for nimodipine (R = 5.80) and cinildilpine (R = 5.65); n-hexane/isopropanol (92:8, v/v) for nicardipine (R = 1.76) and nisoldipine (R = 1.92); and n-hexane/isopropanol/ethanol (97:2:1, v/v/v) for felodipine (R = 1.84) and lercanidipine (R = 1.47). Relative separation mechanisms are discussed based on the separation results, and indicate that the achiral parts in the analytes' structure showed an important influence on the separation of the chiral column.


Assuntos
Celulose/química , Cromatografia Líquida de Alta Pressão/métodos , Di-Hidropiridinas/química , Di-Hidropiridinas/isolamento & purificação , 2-Propanol/química , Estereoisomerismo
11.
Angew Chem Int Ed Engl ; 54(2): 588-93, 2015 Jan 07.
Artigo em Inglês | MEDLINE | ID: mdl-25393650

RESUMO

The synthesis of highly nitrogen-doped mesoporous carbon spheres (NMCS) is reported. The large pores of the NMCS were obtained through self-polymerization of dopamine (DA) and spontaneous co-assembly of diblock copolymer micelles. The resultant narrowly dispersed NMCS possess large mesopores (ca. 16 nm) and small particle sizes (ca. 200 nm). The large pores and small dimensions of the N-heteroatom-doped carbon spheres contribute to the mass transportation by reducing and smoothing the diffusion pathways, leading to high electrocatalytic activity.


Assuntos
Carbono/química , Micelas , Nitrogênio/química , Polímeros/química , Microscopia Eletrônica de Varredura
12.
Int J Biol Macromol ; 273(Pt 1): 133052, 2024 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-38857732

RESUMO

Scalable and highly efficient bamboo whitening remains a great challenge. Herein, an effective bamboo whitening strategy is proposed based on photocatalyzed oxidation, which involves H2O2 infiltration and UV illumination. The as-prepared white bamboo well maintains the nature structure of natural bamboo and demonstrates high whiteness and superior mechanical properties. The absorbance value is significantly decreased to 3.5 and the transmittance is increased to 0.04 % in UV-visible wavelength range due to the removal of light-absorbing chromospheres of lignin, resulting in a high whiteness when the UV illumination time is 8 h. In addition, the white bamboo displays a high tensile strength of 30 MPa and a high flexural strength of 36 MPa due to the well-preserved lignin units (lignin preservation is about 89 %). XRD patterns and analysis show that photocatalyzed oxidation has no effect on the crystal parameters of cellulose. Compared with the traditional bamboo whitening technology, our photocatalyzed oxidation strategy demonstrates significant advantage including chemical and time conservation, high efficiency, environment friendliness, and mechanical robustness. This highly efficient and environmentally friendly photocatalyzed oxidation strategy for the fabrication of white bamboo may pave the way of bamboo-based energy-efficient structural materials for engineering application.


Assuntos
Lignina , Oxirredução , Lignina/química , Catálise , Sasa/química , Peróxido de Hidrogênio/química , Resistência à Tração , Raios Ultravioleta , Processos Fotoquímicos , Cor , Poaceae/química
13.
Biol Trace Elem Res ; 202(1): 221-232, 2024 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-37059921

RESUMO

In the process of tooth development, the interaction between genetic information, epigenetic inheritance, and environment jointly affects the teeth formation. At present, the mechanism of dental fluorosis is rarely studied from transcriptomics, and there is no report on epigenetic perspective. In the study, SD rats were randomly divided into dental fluorosis group and control group fed with NaF (150 mg/L) or distilled water for 8 weeks. After 3.5 days of birth, the RNAs or DNA of rat mandibular molars were detected by RNA-seq or MethylTarget, respectively. The results demonstrated that a total of 1723 differentially expressed genes (DEGs) and 2511 differential expression lncRNAs (DE-lncRNAs) were mainly involved in the ion channels, calcium ion transport, and immunomodulatory signaling pathways. ATP2C1 and Nr1d1, which were related to Ca2+ transport, cellular calcium homeostasis, endoplasmic reticulum stress and immunity, may be the key genes in the formation of dental fluorosis. Notably, we also found that the immune response plays an important role in the formation of dental fluorosis, and a large amount of DEGs was enriched in immune regulation and NF-κB signaling pathways. Furthermore, the methylation levels of 13 sites were increased in Ago4, Atf3, Atp2c1, Dusp1, Habp4, and Mycl, while methylation levels of 5 CpG sites decreased in Ago4, Atp2c1, Habp4, and Traf6, and conformably, the expression of these genes have been significantly changed. This study comprehensively analyzed the occurrence mechanism of dental fluorosis from transcriptomics and epigenetics, so as to provide theoretical reference for further research.


Assuntos
Fluorose Dentária , RNA Longo não Codificante , Ratos , Animais , Fluoretos/metabolismo , Fluorose Dentária/epidemiologia , RNA Longo não Codificante/genética , RNA Longo não Codificante/metabolismo , Metilação de DNA/genética , Ratos Sprague-Dawley , Expressão Gênica
14.
Cell Immunol ; 281(2): 111-21, 2013 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-23603047

RESUMO

Foot-and-mouth disease (FMD) is a kind of the important animal infectious disease caused by the foot-and-mouth disease virus (FMDV). Thus, the aim of this study was to determine the effects of the polysaccharide from the Radix Cyathulae officinalis Kuan (RCPS) for its adjuvant potential on the FMDV-specific cellular and humoral immune responses in mice. In this study, our findings shows that oral administration of RCPS significantly enhanced the phagocytic capacity of peritoneal macrophage, splenocyte proliferation, the activity of natural killer (NK) cells and cytotoxic T lymphocytes (CTL) and IgG, IgG1, IgG2a, and IgG2b antibody titers. Furthermore, RCPS promoted the level of IL-2, IFN-γ and IL-4 in CD4(+)T cells and level of IFN-γ in CD8(+)T cells. In addition, RCPS enhanced the expression of CD40(+), CD80(+) and CD86(+) on DCs. Importantly, RCPS could up-regulated the mRNA level of MHC I, MHC II, TLR-2, TLR-4. Interestingly, RCPS down-regulated the frequency of CD4(+)CD25(+)Foxp3(+)Treg cells. Taken together, these results demonstrate that RCPS can enhance both cellular and humoral immune responses via up-regulating DCs maturation through TLR2, TLR4 signaling pathway, and suppressing Treg frequency.


Assuntos
Amaranthaceae/química , Vírus da Febre Aftosa/imunologia , Febre Aftosa/imunologia , Raízes de Plantas/química , Polissacarídeos/imunologia , Adjuvantes Imunológicos/administração & dosagem , Administração Oral , Animais , Citocinas/imunologia , Citocinas/metabolismo , Células Dendríticas/efeitos dos fármacos , Células Dendríticas/imunologia , Células Dendríticas/metabolismo , Feminino , Febre Aftosa/prevenção & controle , Febre Aftosa/virologia , Humanos , Imunoglobulina G/imunologia , Imunoglobulina G/metabolismo , Células K562 , Células Matadoras Naturais/efeitos dos fármacos , Células Matadoras Naturais/imunologia , Macrófagos Peritoneais/efeitos dos fármacos , Macrófagos Peritoneais/imunologia , Complexo Principal de Histocompatibilidade/genética , Complexo Principal de Histocompatibilidade/imunologia , Camundongos , Camundongos Endogâmicos ICR , Fagocitose/imunologia , Polissacarídeos/administração & dosagem , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Linfócitos T/efeitos dos fármacos , Linfócitos T/imunologia , Linfócitos T/metabolismo , Linfócitos T Reguladores/efeitos dos fármacos , Linfócitos T Reguladores/imunologia , Linfócitos T Reguladores/metabolismo , Receptor 2 Toll-Like/genética , Receptor 2 Toll-Like/imunologia , Vacinação
15.
Genes (Basel) ; 14(7)2023 06 23.
Artigo em Inglês | MEDLINE | ID: mdl-37510226

RESUMO

Real-time quantitative PCR (RT-qPCR) is a method with high sensitivity and convenience that has been extensively used to analyze the expression level of target genes. A reference gene with a highly stable expression is required to ensure the accuracy of experimental results. However, the report on appropriate reference genes in arrowheads (Sagittaria trifolia) is still limited. In this study, eight candidate reference genes (ACT5, UBQ, GAPDH, CYP, NAC, IDH, SLEEPER and PLA) were selected. The candidate genes were employed in a RT-qPCR assay in different tissues at different developmental stages of the same tissue (including corm, leaf and leafstalk) in arrowheads. Five statistical algorithms, GeNorm, NormFinder, BestKeeper, delta cycle threshold (ΔCt) and RefFinder, were used to evaluate the stability of these genes' expressions in order to identify the appropriate reference genes. The results showed that UBQ was the optimum reference gene in leaf, leafstalk, root, stolon and corm, IDH exhibited the most stable expression during the expansion of corm, UBQ and PLA were the most stable reference genes in developmental stages of leaf and leafstalk, respectively. Finally, the reliability of reference genes was further confirmed by the normalization of PDS and EXP1 genes under different arrowhead tissues and developmental stages of corm, respectively. This study constitutes important guidance for the selection of reliable reference genes for analyzing the tissue- and developmental-stage-specific expression of genes in arrowheads.


Assuntos
Sagittaria , Sagittaria/genética , Reprodutibilidade dos Testes , Reação em Cadeia da Polimerase em Tempo Real/métodos , Expressão Gênica , Poliésteres
16.
Biomed Res Int ; 2023: 4038278, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-36820224

RESUMO

Hard tissues make up the vast majority of teeth and are mineralized from the surrounding matrix. If the development of tooth germ is affected during mineralization, hypoplasia of the tooth tissue can occur. To better understand the mechanisms mediating hypoplasia, we need to first study normal development. Using a rodent model, we highlight the transcriptomic changes that occur from the differentiation to secretion stages of mandibular molar germs. The tooth germ was dissected from rats at postnatal day 1.5 or 3.5 for high-throughput sequencing. Combining transcriptome analysis and DNA methylation, we identified 590 differentially expressed genes (436 upregulated and 154 downregulated) and 551 differentially expressed lncRNAs (long noncoding RNA; 369 upregulated and 182 downregulated) which were linked to the biological processes of odontogenesis, amelogenesis, tooth mineralization, and the alteration of extracellular matrix (ECM), especially matrix metalloproteinases (MMPs) and elastin. We found DNA methylation changes in 32 selected fragments involved in 5 chromosomes, 26 targets, and 2 haplotypes. Finally, three novel genes were identified: MMP20, Tgfb3, and Dusp1. Further analysis revealed that MMP20 has a role in odontogenesis and amelogenesis by influencing Slc24a4 and DSPP; Tgfb3 is involved in epithelial cell proliferation, cellular component disassembly process, ECM cellular component, and decomposition of cell components. But lncRNA expression could affect DNA methylation and mRNA expression. Moreover, the degree of DNA methylation could also affect the transcriptome level. Thus, Tgfb3 had no difference in DNA methylation, and Dusp1 conferred no difference at the transcriptome level. These three genes were all enriched in the MAPK pathway and played an important role in ECM remodeling. These data suggest that during the period of the bell differentiation stage to the secretory stage, along with enamel/dentin matrix secretion and hard tissue occurrence, the ECM is remodeled via MAPK signaling.


Assuntos
Transcriptoma , Fator de Crescimento Transformador beta3 , Ratos , Animais , Metaloproteinase 20 da Matriz , Germe de Dente , Odontogênese , Diferenciação Celular , Matriz Extracelular , Perfilação da Expressão Gênica , Transdução de Sinais
17.
Chemistry ; 18(51): 16517-24, 2012 Dec 14.
Artigo em Inglês | MEDLINE | ID: mdl-23108596

RESUMO

The fabrication of hierarchical magnetic nanomaterials with well-defined structure, high magnetic response, excellent colloidal stability, and biocompatibility is highly sought after for drug-delivery systems. Herein, a new kind of hollow-core magnetic colloidal nanocrystal cluster (HMCNC) with porous shell and tunable hollow chamber is synthesized by a one-pot solvothermal process. Its novelty lies in the "tunability" of the hollow chamber and of the pore structure within the shell through controlled feeding of sodium citrate and water, respectively. Furthermore, by using the ligand-exchange method, folate-modified poly(acrylic acid) was immobilized on the surface of HMCNCs to create folate-targeted HMCNCs (folate-HMCNCs), which endowed them with excellent colloidal stability, pH sensitivity, and, more importantly, folate receptor-targeting ability. These assemblages exhibited excellent colloidal stability in plasma solution. Doxorubicin (DOX), as a model anticancer agent, was loaded within the hollow core of these folate-HMCNCs (folate-HMCNCs-DOX), and drug-release experiments proved that the folate-HMCNCs-DOX demonstrated pH-dependent release behavior. The folate-HMCNCs-DOX assemblages also exhibited higher potent cytotoxicity to HeLa cells than free doxorubicin. Moreover, folate-HMCNCs-DOX showed rapid cell uptake apart from the enhanced cytotoxicity to HeLa cells. Experimental results confirmed that the synthesized folate-HMCNCs are smart nanovehicles as a result of their improved folate receptor-targeting abilities and also because of their combined pH- and magnetic-stimuli response for applications in drug delivery.


Assuntos
Resinas Acrílicas/química , Antineoplásicos/química , Coloides/química , Doxorrubicina/química , Ácido Fólico/química , Nanopartículas/química , Resinas Acrílicas/farmacologia , Antineoplásicos/farmacologia , Linhagem Celular Tumoral , Sistemas de Liberação de Medicamentos , Células HeLa , Humanos , Ligantes , Estrutura Molecular
18.
ACS Sens ; 7(5): 1602-1611, 2022 05 27.
Artigo em Inglês | MEDLINE | ID: mdl-35499166

RESUMO

Three kinds of coordination cages and a molecular knot with inductively activated +P-H, N-H, or C-H hydrogen bond donors anchoring in the functionalized cavities were inspected as ionophores to develop polymeric membrane ISEs for potentiometric sensing of environmentally important oxyanions and halides. The proposed ISEs displayed significant preference for perrhenate, phosphate, or chloride with a selectivity pattern distinctively different from the sequence depending on the Gibbs free energy of hydration owing to the high degree of shape, charge, and size selectivity originating from the rigidity and complementarity of the binding cavities. To gain further insight into the response characters of the proposed ISEs, the binding constants of ionophore-anion complexes in the membrane phase were investigated, and the binding affinity, together with the Hofmeister series, correlates well with the determined selectivity pattern of the proposed ISEs. Optimizing the composition of the membrane such as lipophilic additives and plasticizers produced ISEs displaying Nernstian/near-Nernstian potentiometric responses to primary anions with a wide linear range, improved detection limits, good reversibility, and satisfying lifetime. Potentiometric determination of perrhenate, phosphate, and chloride in river water, mineral water, and artificial serum samples was achieved with good recovery and accuracy using the proposed ISEs, demonstrating their potential for real-life applications. These results will shed new light on how novel ionophores could be designed for potentiometric sensing and broaden the scope of host-guest chemistry of coordination cages and molecular knots.


Assuntos
Cloretos , Polímeros , Ânions , Halogênios , Ionóforos/química , Fosfatos , Potenciometria/métodos
19.
J Biomed Mater Res B Appl Biomater ; 110(4): 755-767, 2022 04.
Artigo em Inglês | MEDLINE | ID: mdl-34637601

RESUMO

Human-treated dentin matrix (hTDM) is a biomaterial scaffold, which can induce implant cells to differentiate into odontoblasts and then form neo-dentin. However, hTDM with long storage or prepared by high-speed handpiece would not to form neo-dentin. In this research, we developed two fresh hTDM with different grinding speeds, which were low-speed hTDM (LTDM) with maximum speed of 500 rpm and high-speed hTDM (HTDM) with a speed of 3,80,000 rpm. Here, we aim to understand whether there were induced regeneration capacity differences between LTDM and HTDM. Scanning electron microscope showed that DFCs grew well on both materials, but the morphology of DFCs and the extracellular matrix was different. Especially, the secreted extracellular matrixes on the inner surface of LTDM were regular morphology and ordered arrangement around the dentin tubules. The transcription-quantitative polymerase chain reaction (qRT-PCR), western blot and immunofluorescence assay showed that the dentin markers DSPP and DMP-1 were about 2× greater in DFCs induced by LTDM than by HTDM, and osteogenic marker BSP was about 2× greater in DFCs induced by HTDM than by LTDM. Histological examinations of the harvested grafts observed the formation of neo-tissue were different, and there were neo-dentin formed on the inner surface of LTDM and neo-cementum formed on the outer surface of HTDM. In summary, it found that the induction abilities of LTDM and HTDM are different, and the dentin matrix is directional. This study lays a necessary foundation for searching the key factors of dentin regeneration in future.


Assuntos
Dentina , Matriz Extracelular , Diferenciação Celular , Células Cultivadas , Humanos , Odontoblastos , Regeneração
20.
Zhongguo Gu Shang ; 35(8): 732-5, 2022 Aug 25.
Artigo em Zh | MEDLINE | ID: mdl-35979765

RESUMO

OBJECTIVE: To explore the risk factors of hidden blood loss in osteoporosis vertebral compression fractures during percutaneous vertebral augmentation. METHODS: From October 2018 to December 2019, 360 patients with osteoporosis vertebral compression fractures who received percutaneous vertebral augmentation were enrolled in this study. The factors analyzed included gender, age, surgical methods, disease course, height, weight, the operative segment, bone mineral density, amount of bone cement, operative time, percentage of height loss, percentage of vertebral height restoration, cement leakage, blood clotting function, preoperative and postoperative hemoglobin and hematocrit and other internal diseases. Total blood loss was calculated by Gross's formula, influential factors of the hidden blood loss were further analyzed by t-test, multivariate linear regression and one-way ANOVA analysis. RESULTS: Surgical methods, the operative segment, disease course, cement leakage, preoperative hemoglobin, cement leakage via the basivertebral and segmental vein were significantly correlated with hidden blood loss(P<0.05). CONCLUSION: Patients with percutaneous kyphoplasty, two-level and multi-level surgery, the course of the disease beyond 6 weeks, cement leakage via the basivertebral and segmental vein, and lower preoperative hemoglobin had more perioperative hidden blood loss.


Assuntos
Fraturas por Compressão , Cifoplastia , Osteoporose , Fraturas por Osteoporose , Fraturas da Coluna Vertebral , Vertebroplastia , Cimentos Ósseos/efeitos adversos , Fraturas por Compressão/etiologia , Humanos , Cifoplastia/efeitos adversos , Cifoplastia/métodos , Osteoporose/complicações , Fraturas por Osteoporose/cirurgia , Estudos Retrospectivos , Fatores de Risco , Fraturas da Coluna Vertebral/etiologia , Resultado do Tratamento , Vertebroplastia/efeitos adversos
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