Meta-analysis of the efficacy of invisible orthodontic appliances for maxillary molar distalization in adult patients / 口腔疾病防治

Objective@#To evaluate the clinical efficacy of invisible orthodontic appliances without brackets for the distal movement of maxillary molars to improve the ability of orthodontists to predict treatment outcomes.@*Methods@#Web of Science, Cochrane Library, Embase, PubMed, Wanfang Database, CNKI Database, and VIP Database were searched for studies investigating the efficacy of invisible orthodontic appliances for distal movement of maxillary molars in adult patients and published from database inception to August 1, 2023. A total of three researchers screened the studies and evaluated their quality and conducted a meta-analysis of those that met quality standards.@*Results@#This study included 13 pre- and postcontrol trials with a total sample size of 281 patients. The meta-analysis revealed no significant differences in the sagittal or vertical parameters of the jawbone after treatment when compared with those before treatment (P>0.05). The displacement of the first molar was MD=-2.34, 95% CI (-2.83, -1.85); the displacement was MD=-0.95, 95% CI (-1.34, -0.56); and the inclination was MD=-2.51, 95% CI (-3.56, -1.46). There was a statistically significant difference in the change in sagittal, vertical, and axial tilt of the first molar before and after treatment. After treatment, the average adduction distance of the incisors was MD=-0.82, 95% CI (-1.54, -0.09), and the decrease in lip inclination was MD=-1.61, 95% CI (-2.86, -0.36); these values were significantly different from those before treatment (P<0.05).@*Conclusion@#Invisible orthodontic appliances can effectively move the upper molars in a distal direction and control the vertical position of the molars. When the molars move further away, there is some degree of compression and distal tilt movement, which is beneficial for patients with high angles. The sagittal movement of incisors is beneficial for improving the patient's profile.

W3D improves LPS-induced acute lung injury in mice by regulating TLR4/MD2-NF-κB p65 signaling pathway / 中国药理学通报

Aim To investigate the protective effect of new structure compound 4-(5'-dimethylamino)-naphthalenesulfonyl-2 (3H)-benzoxazolone (W3D) on lipopolysaccharide (LPS) induced acute lung injury (ALI) and the underlying mechanism. Methods ICR mice were randomly divided into control group, LPS model group, chlorzoxazone (12.5 mg · kg

Dissemination pattern of bacterial heart rot (BHR) disease and screening of the disease resistance among commercial pineapple varieties in Malaysia

Aims@#Bacterial heart rot (BHR) disease caused by Erwinia chrysanthemi or the new nomenclature Dickeya zeae was identified as the lethal disease of pineapple and caused massive losses for the farmers due to non-satisfactory solutions. Thus, this study aims to understand the disease dissemination pattern and screen for tolerance pineapple variety prior to establishment of disease management strategies. @*Methodology and results@#Dissemination of BHR disease was observed visually in 2 study plots consisting 200 plants in each plot. Single plant inoculation of the pathogen was done in each plot namely Plot A at the edge and Plot B at the middle. Disease incidence was recorded at weekly interval for 12 weeks. The pattern of disease spreading in both plots was then mapped based on the results. Separately, 8 commercial pineapple varieties (Maspine, N36, MD2, Morris, Sarawak, Kristal, Gandul and Josapine) were screened for their resistance towards BHR. The varieties screening study was carried out using complete randomized block design. Overall, disease incidence (DI) was observed lower in plot A compared to Plot B. Percentage of DI in Plot A increased continuously from week 1 to 12, but in plot B the DI was stagnant starting from week 3 onwards. This study revealed that there is highly significant difference in percentage of infection between varieties tested. Josapine and MD2 were the most infected varieties based on lesion on plant. Both were found susceptible to BHR. Besides that, Chrystal Honey, Maspine and Sarawak varieties were less infected and classified as moderately resistance compared to other varieties. @*Conclusion, significance and impact of study@#Inoculum source was recognized as determinant factor for dissemination of BHR. Aggregation pattern was observed, and disease spreading was severe when disease started from the edge of the plot compared to in the middle. These findings will help farmers to choose the varieties of interest and plan for disease control measure based on first observed disease symptom in their field. This study is also important to researchers and plant breeders for varietal improvement in the future.

Association of Single Nucleotide Polymorphisms in the MD-2 Gene Promoter Region With Der p 2 Allergy

PURPOSE: Sensitization to house dust mite (Dermatophagoides pteronyssinus) is a considerable risk factor for the progression of allergic disease. The group 2 allergen from Dermatophagoides pteronyssinus, Der p 2, is considered a major one in patients with specific immunoglobulin E (IgE) to Der p 2. Der p 2 has structural homology with myeloid differentiation 2 (MD-2), which is involved in the lipopolysaccharide-binding component of the Toll-like receptor 4 signaling pathway and the development of inflammation. The aim of this study was to examine the genetic association of single nucleotide polymorphisms (SNPs) in the promoter region of MD-2 with Der p 2-sensitive allergy. METHODS: We investigated associations between cohort's characteristics, including 280 allergic and 80 healthy subjects by examining total IgE, eosinophils, D. pteronyssinus-specific IgE, Der p 2-specific IgE, the number of IgE-producing B cells induced by Der p 2, and the odds ratio of allergic symptoms. RESULTS: Based on the 1,000 genome project data, the minor allele frequencies of the rs1809441 and rs1809442 are 0.467 and 0.474, respectively. However, the correlation of linkage disequilibrium (LD) between these 2 SNPs is D'=1, the genotype frequencies of the 2 MD-2 (LY96) SNPs (rs1809441 and rs1809442) that are located nearby were significantly different between allergic and health subjects: the TT genotype of rs1809441 and the GG genotype of rs1809442 were more frequent in allergic subjects than in healthy subjects (16.1% vs 2.5% in both genotypes). The allergic patients with these genotypes exhibited significantly higher levels of D. pteronyssinus-specific IgE and Der p 2-specific Ig E, and a larger number of Der p 2-activated B cells. In addition, these 2 SNPs in the MD-2 promoter region were significantly associated with the prevalence of nasal, skin, and asthmatic allergic symptoms. CONCLUSIONS: Our results indicated that 2 SNPs in the MD-2 promoter region were significantly associated with Der p 2-specific Ig E, and thereby suggest that these SNPs may play a major role in susceptibility to Der p 2-triggered immune responses in a Taiwanese population.

Effects of Volatile Oil and 2-Undecanone from Houttuynia Cordata Thunb. on LPS-TLR4/MD-2-TNF-α Inflammation Signaling Pathway / 医药导报

Objective To explore the effects of volatile oil and 2-undecanone from Houttuynia Cordata Thunb. (H. cordata) on LPS-TLR4 / MD-2-TNF-α signaling pathway. Methods TLR4 / MD-2 blocking agent was used to mask the TLR4 /MD-2 site,then protein expression levels of TLR4 in cells treated with volatile oil and 2-undecanone were analyzed by western blot. ELISA was used to detect the secretion of the inflammatory cytokines such as TNF-α,IL-1β and IL-10. Comparison analysis was then performed from the results of cell experiments in vitro and anti-inflammatory effects through xylene-induced ear edema test in vivo. Results In concentrations between 1 to 10 μg · mL-1 ,Houttuynia volatile oil showed better effect than 2-undecanone on inhibition of TLR4 protein in LPS-induced RAW264. 7 cells, and had some differences in the effects on inflammatory factors. Compared with the LPS+TLR4 / MD-2 group,the LPS+TLR4 / MD-2 + volatile oil group had no significant difference in the expression of TLR4 protein (P>0. 05),but the LPS+TLR4 / MD-2 +2-undecanone group reduced the expression of TLR4 protein obviously. It appeared that volatile oil exerts its anti-inflammatory effect through LPS-TLR4 / MD-2-TNF-αpathway,but 2-undecanone may exert its anti-inflammatory effect by other means. Houttuynia volatile oil showed better anti-inflammatory activity than 2-undecanone in vivo at the same dose. Conclusion There are some differences in anti-inflammatory effects and related mechanisms between volatile oil and 2-undecanone, probably owing to the synergistic effects of multi-ingredients in the volatile oil.

Effects of Xuanfeitongfufang Decoction on Expressions of MD-2 and NF-κB in Lung of Rats ;with Acute Lung Injury Caused by Lipopolysaccharide / 中国中医药信息杂志

Objective To investigate the effects of Xuanfeitongfufang Decoction on expressions of MD-2, NF-κB protein and its mRNA in lung of the rats with acute lung injury caused by LPS. Methods Wistar rats were randomly divided into normal group, model group, dexamethasone group and Xuanfeitongfufang Decoction large-, medium-, small-dose group, each group had eight rats. The ALI rat model was established by LPS tail-intravenous injection (6 mg/kg). The rats in Xuanfeitongfufang Decoction groups were pretreated by Xuanfeitongfufang Decoction (15.12, 7.56, 3.78 g/kg) for 3 days before LPS induced ALI. The rats in dexamethasone group were pretreated by dexamethasone (5 mg/kg). MD-2, NF-κB protein and its mRNA were measured by immunohistochemistry and PCR. The histopathology of the lung injury was observed by light microscope. Results Compared with normal group, the expression of MD-2, NF-κB protein and its mRNA were obviously increased in model group (P<0.01). Compared with model group, the expression of MD-2, NF-κB protein and its mRNA were obviously decreased in Xuanfeitongfufang Decoction groups and dexamethasone group (P<0.01), and there was no obvious difference between Xuanfeitongfufang Decoction groups and dexamethasone group. Light microscope observation indicates that there were large areas of pulmonary hemorrhage and necrosis in model group. While in Xuanfeitongfufang Decoction group and dexamethasone group, the pathological manifestations were much more ameliorated than those of the model group. The lung bronchiale inflammation appeared occasionally, and the edema was lightly. Conclusion Xuanfeitongfufang Decoction can lessen the injury of lung tissue and has protective effects on rats with ALI, the mechanism is possibly related to the inhibition of the expressions of MD-2 and NF-κB protein and its mRNA in injured lung tissues.

Recognition of lipopolysaccharide pattern by TLR4 complexes

Lipopolysaccharide (LPS) is a major component of the outer membrane of Gram-negative bacteria. Minute amounts of LPS released from infecting pathogens can initiate potent innate immune responses that prime the immune system against further infection. However, when the LPS response is not properly controlled it can lead to fatal septic shock syndrome. The common structural pattern of LPS in diverse bacterial species is recognized by a cascade of LPS receptors and accessory proteins, LPS binding protein (LBP), CD14 and the Toll-like receptor4 (TLR4)-MD-2 complex. The structures of these proteins account for how our immune system differentiates LPS molecules from structurally similar host molecules. They also provide insights useful for discovery of anti-sepsis drugs. In this review, we summarize these structures and describe the structural basis of LPS recognition by LPS receptors and accessory proteins.

Using FRET to Study The Interaction Domain of TLR4 Binding to MD-2 in Living Cells / 生物化学与生物物理进展

TLR4-MD-2 complex plays a key role in LPS recognition and its signal transduction. These steps are the vital elements of the host's defensive reaction. Studying the functional domain of TLR4 and MD-2 is very important to further understand the mechanism of LPS signal transduction. It was studied the interaction domain of TLR4 and MD-2 in living cells based on gene mutation, gene transfection and fluorescence resonance energy tramsfer(FRET) which is considered as one of the best methods used for intracellular protein-protein interaction study. CY-15P which was fused by CFP and YFP through 15 neutral amino acids was used as positive control, while co-expressed CFP and YFP proteins were used as negative control. The results showed that the ability of TLR4 binding to MD-2 decreased dramatically after the deletion of Glu~(24) ～ Met~(41) in N terminal of TLR4. Aggregation of TLR4 to LPS stimulation was observed, however, TLR4 without the Glu~(24)～ Met~(41) mutation did not aggregate. All these results indicated that TLR4 Glu~(24)～ Met~(41) might be the interaction domain of TLR4 binding to MD-2 and participate in the aggregation effect of TLR4 upon LPS stimulation.

The Role of MD-2 in The Process of Endotoxin Recognition and Signal Transduction / 生物化学与生物物理进展

Lipopolysaccharide(LPS) can induce cell inflammation through interacting with TLR4. Recent studies have revealed that MD-2 participate in the process of LPS induced signal transduction pathway by forming a complex with TLR4. After binding to the MD-2 of the TLR4/MD-2 complex, LPS can induce TLR4- oligomerization and activate the downstream signal pathway. After being synthesized, most MD-2 can bind to TLR4 at the endoplasmic reticulum /Golgi apparatus and expresse as TLR4/MD-2 complex at the cellular surface. Therefore MD-2 not only can regulate the distribution of TLR4 in the cytoplasm, but also help TLR4 to recognize LPS. Another part of MD-2 can be released into plasma as soluble MD-2(sMD-2). With the help of CD14, sMD-2 would interact with LPS in the plasma to constitute LPS-sMD-2 complex, helping cell who express only TLR4, to recognize LPS, however excessive expressed sMD-2 would repress the LPS signal transduction pathway. In conclusion, MD-2 plays a crucially modulating role in the process of TLR4 mediated endotoxin recognition and signal transduction.