Miscibility, Crystallization, and Rheological Behavior of Solution Casting Poly（3-hydroxybutyrate）/poly（ethylene succinate） Blends Probed by Differential Scanning Calorimetry, Rheology, and Optical Microscope Techniques

The miscibility and crystallization of solution casting biodegradable poly（3-hydroxybuty- rate）/poly（ethylene succinate） （PHB/PES） blends was investigated by differential scanning calorimetry, rheology, and optical microscopy. The blends showed two glass transition temperatures and a depression of melting temperature of PHB with compositions in phase diagram, which indicated that the blend was partially miscible. The morphology observation supported this result. It was found that the PHB and PES can crystallize simultaneously or upon stepwise depending on the crystallization temperatures and compositions. The spherulite growth rate of PHB increased with increasing of PES content. The influence of compositions on the spherulitic growth rate for the partially miscible polymer blends was discussed.

Biosynthesis of poly-3-hydroxybutyrate with a high molecular weight by methanotroph from methane and methanol

Poly-3-hydroxybutyrate （PHB） can be produced by various species of bacteria. Among the possible carbon sources, both methane and methanol could be a suitable substrate for the production of PHB. Methane is cheap and plentiful not only as natural gas, but also as biogas. Methanol can also maintain methanotrophic activity in some conditions. The methanotrophic strain Methylosinus trichosporium IMV3011 can accumulate PHB with methane and methanol in a brief nonsterile process. Liquid methanol （0.1%） was added to improve the oxidization of methane. The studies were carried out using shake flasks. Cultivation was performed in two stages： a continuous growth phase and a PHB accumulation phase under the conditions short of essential nutrients （ammonium, nitrate, phosphorus, copper, iron （Ⅲ）, magnesium or ethylenediamine tetraacetate （EDTA）） in batch culture. It was found that the most suitable growth time for the cell is 144 h. Then an optimized culture condition for second stage was determined, in which the PHB concentration could be much increased to 0.6 g/L. In order to increase PHB content, citric acid was added as an inhibitor of tricarboxylic acid cycle （TCA）. It was found that citric acid is favorable for the PHB accumulation, and the PHB yield was increased to 40% （w/w） from the initial yield of 12% （w/w） after nutrient deficiency cultivation. The PHB produced is of very high quality with molecular weight up to 1.5 × 10^6Da.

Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) supports adhesion and migration of mesenchymal stem cells and tenocytes

AIM: To establish the potential of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) as a material for tendon repair. METHODS: The biocompatibility of PHBHHx with both rat tenocytes (rT) and human mesenchymal stem cells (hMSC) was explored by monitoring adhesive characteristics on films of varying weight/volume ratios coupled to a culture atmosphere of either 21% O2 (air) or 2% O2 (physiological normoxia). The diameter and stiffness of PHBHHx films was established using optical coherence tomography and mechanical testing, respectively. RESULTS: Film thickness correlated directly with weight/volume PHBHHx (r2 = 0.9473) ranging from 0.1 mm (0.8% weight/volume) to 0.19 mm (2.4% weight/volume). Film stiffness on the other hand displayed a biphasic response which increased rapidly at values > 1.6% weight/volume. Optimal cell attachment of rT required films of ≥ 1.6% and ≥ 2.0% weight/volume PHBHHx in 2% O2 and 21% O2 respectively. A qualitative adhesion increase was noted for hMSC in films ≥ 1.2% weight/volume, becoming significant at 2% weight/volume in 2% O2. An increase in cell adhesion was also noted with ≥ 2% weight/volume PHBHHx in 21% O2. Cell migration into films was not observed. CONCLUSION: This evaluation demonstrates that PHBHHx is a suitable polymer for future cell/polymer replacement strategies in tendon repair.

Production of Poly(3-Hydroxybutyrate)by Fed-Batch Culture of Alcaligenes Eutrophus at Phosphorus Limitation in 50 L fermenter

Poly(3-hydroxybutyrate) (PHB) is an intracellular carbon and energy storage material accumulated by many kinds of microorganism under unfavorable growth conditions. For the production of PHB, Alcaligenes eutrophus has been widely used because it is easy to grow, and its physiological and biochemical changes during the PHB synthesis is understood in details. A very high concentration and productivity of PHB could be obtained by fed-batch culture of Alcaligenes eutrophus with phosphate limitation in 50 L fermenter.

Complete Valorization of Olive Mill Wastewater through an Integrated Process for Poly-3-hydroxybutyrate Production

An economical and environmental sustainability of bioplastic production is dependent on the use of low cost and waste C-sources as raw materials. OMW （Olive Mill Wastewater） with its high organic load represents a dangerous polluting waste. Herein the authors present an integrated process for the simultaneous recovery of polyphenols, high value natural antioxidants, production of PHAs （polyhydroxyalkanotes）, thermoplastic bio-polymers, in particular of PHB （poly-3-hydroxybutyrate） starting from OMW. The combination of membrane filtration and bacterial digestion of OMW resulted in very high yields of polyphenols （3 2.5 g/L） and PHB （31.4 mg/L.h） if compared with the state of the art. These results make the technical approach described here effective for reducing the polluting effect of OMW and maximizing the valuable product yield. Moreover the process is readily suitable for an industrial scale PHB production from OMW.

BIOSYNTHESIS AND THERMAL PROPERTIES OF POLY(3-HYDROXYBUTYRATE-co-3-HYDROXYVALERATE)WITH LARGE VARIETY OF HYDROXYVALERATE CONTENTS BY BACILLUS CEREUS

Biosynthesis and thermal properties of poly（3-hydroxybutyrate-co-3-hydroxyvalerate） （PHBV） with different HV （hydrovalerate） content produced by a Bacillus cereus strain were investigated. A large variety of HV contents （up to about 90 mol%） of PHBV could be produced by this strain. Combined nitrogen sources containing both yeast extract and ammonium sulphate were better for cell growth and polyhydroxyalkanoates （PHA） production than either yeast extract or ammonium sulphate alone. Propionic acid is more favorable for the production of HV content than that of valeric acid. Finally, thermal properties of PHBV produced by this strain are found close to the results of other groups.

Silk fibroins modify the atmospheric low temperature plasma-treated poly (3-hydroxybutyrate-co-3-hydroxyhexanoate) film for the application of cardiovascular tissue engineering

Tissue engineered scaffold is one of the hopeful therapies for the patients with organ or tissue damages. The key element for a tissue engineered scaffold material is high biocompatibility. Herein the poly (3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) film was irradiated by the low temperature atmospheric plasma and then coated by the silk fibroins (SF). After plasma treatment, the surface of PHBHHx film became rougher and more hydrophilic than that of original film. The experiment of PHBHHx flushed by phosphate buffer solution (PBS) proves that the coated SF shows stronger immobilization on the plasma-treated film than that on the untreated film. The cell viability assay demonstrates that SF-coated PHBHHx films treated by the plasma significantly supports the proliferation and growth of the human smooth muscle cells (HSMCs). Furthermore, the scanning electron microscopy and hemotoylin and eosin (HE) staining show that HSMCs formed a cell sub-monolayer and secreted a large amount of extracellular matrix (ECM) on the films after one week's culture. The silk fibroins modify the plasma-treated PHBHHx film, providing a material potentially applicable in the cardiovascular tissue engi-neering.

STUDY ON BIODEGRADABILITY OF POLY (3-HYDROXYBUTYRATE-co-3-HYDROXYVALERATE)/ORGANOPHILIC MONTMORILLONITE NANOCOMPOSITES

Poly (3-hydroxybutyrate-co-3-hydroxyvalerate)/Organophilic montmorillonite (PHBV/OMMT) nanocomposites were prepared and the biodegradability of the PHBV/OMMT nanocomposites was studied by a cultivation degrading method in soil suspension. The relationship between structure and biodegradability of PHBV/OMMT nanocomposites was investigated. The results showed that the biodegradability of PHBV/OMMT nanocomposites decreased with increasing amount of OMMT and it was related to the number of PHBV degrading microorganisms in degradation environment, the anti-microbial property of OMMT and the degree of crystallinity of the nanocomposites.

THERMAL PROPERTY, MISCIBILITY AND CRYSTALLIZATION BEHAVIOR OF POLY(3-HYDROXYBUTYRATE-co-3-YDROXYHEXANOATE) AND POLY(BUTYLENE SUCCINATE-ADIPATE) (PHBHHX/PBSA) BLENDS

Blends of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) and poly(butylene succinate-adipate) (PBSA), both biodegradable semicrystalline polyesters, were prepared with the ratio of PHBHHx/PBSA ranging from 80/20 to 20/80 by melt mixing method. Differential scanning calorimetry (DSC), thermogravimetry analysis (TGA), dynamic mechanical thermal analysis (DMA), polarizing optical microscopy (POM) and wide angle X-ray diffractometer (WAXD) were used to study the miscibility and crystallization behavior of PHBHHx/PBSA blends. Experimental results indicate that PHBHHx is immiscible with PBSA as shown by the almost unchanged glass transition temperature and the biphasic melt.

Use of a Simple Fabrication Process to Produce a Biosensor： The 3-Hydroxybutyrate Dehydrogenase Case

This study was aimed to construct a biodegradable but reliable 3-β-hydroxybutymte biosensor. In this context a versatile paper based biosensor, quickly, easily and cheaply fabricated is reported. The procedure of fabrication is based on the assumption that the introduction of the enzyme in the carbon ink will allow enzyme stabilization and facilitate the study of the catalysis of enzymes and the detection of substrates. To prove this concept we use the enzyme 3-hydroxybutyrate dehydrogenase, in aqueous solution. This enzyme was chosen because it catalyzes the 3-β-hydroxybutyrate, which results from ketoacidosis. The quantification this substance in the diabetics＇ blood is very important as it can increase the reliability of the diagnosis of glycaemia. To prove the multi-use of this biosensor we not only study the redox process in steady state and during the catalytic process, but also detected and quantify the 3-β-hydroxybutyrate. Our results showed that it was possible to study the redox process that occurred during the catalysis and to confirm the amino acid residues that participate in it. It was also observed that glucose and ascorbic acid can interfere in the detection and quantification of the 3-β-hydroxybutyrate, what should be in mind when the quantification of the 3-β-hydroxybutyrate is made in blood samples.

Optimization of Propionic Acid Feeding for Production of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) in Fed-Batch Culture of Ralstonia eutropha

The feeding method of propionic acid for production ofpoly(3-hydroxybutyrate-co-3-hydro xyvalerate) [P(3HB-co-3HV)] by fed-batch culture of Ralstoniaeutropha was optimized to achieve high cell density and high 3HV yield. Effects of different feedingstrategies of propionic acid on the production of P(3HB-co-3HV) were investigated. A decline ofspecific synthesis rate of copolymer and the yield of 3HV unit from propionic acid were observed dueto the propionic acid accumulation in culture broth when the feeding solution with highP/G(propionic acid to glucose) ratio was employed. It was further confirmed by controlling propionicacid concentration at a low level in the separate feeding of propionic acid. An optimal feedingstrategy was demonstrated to reduce the propionic acid accumulation. The cell concentration,P(3HB-co-3HV) productivity and 3HV unit fraction reached to 163.9kg·m^(-3), 1.8kg·m^(-3)·h^(-1),and 10.6%(by mass), respectively, resulting in a yield of 0.33g HV per g propionic acid.

Effects of Exogenous Na-DL-3-Hydroxybutyrate and Insulin on Skeletal Muscle Protein Metabolism in Rats after Early Severe Burn Injury

the effects of exogenous Na -DL- 3 - hydroxybutyratc (3- HOBNa) and insulin (I)on skeletal muscle protein metabolism in rats infected with 37% TBSA full thickness scald werestudied. It was found that the serum acetoacetatc (AcAc) of the burned animals showed nosignificant difference from the control on the 4th day postburn. but the free fatty acid (FFA) de-ereased markedly and the urinary 3 - methylhistidine (3 - MH ) excretion and the protein degrada-tion rate of the soleus muscle of the injured hind limb increased markedly. Infusion of3 - HOBNa for 3 consecutive days following bums could lower the urinary 3 - MH excretion andthe protein degradation rate of the soleus muscle with no significant influence on the skeletal muscleprotein anabolism. Moreover, investigations revealed that there was no synergistic effect ofinsulin -ketonc body combination on the anti- catabolic capacity in burned rats.

Preparation of Poly(3-hydroxybutyrate) Porous Films by Microemulsion Templates Method

Porous poly(3 hydroxybutyrate)(PHB) membranes were prepared by microemulsion templates. The influence of microemulsion templates on pore size and porosity of the PHB membranes were studied. Preliminary studies showed that the pore size made by microemulsion templates were smaller and were estimated in the range of 100~500 nanometer. In this research, the ultraviolet/visible light spectrometer was applied in the investigation of H 2O/Span85 Tween60/chloroform reserve microemulsion. Surfactant content(P) and water content(R) were optimized. Furthermore, the effects of variation of P and R on the pore size and porosity of PHB films were discussed.

Syntheses of amphiphilic biodegradable copolymers of poly(ethyl ethylene phosphate) and poly(3-hydroxybutyrate) for drug delivery

Biodegradable and amphiphilic triblock copolymers poly(ethyl ethylene phosphate)-poly(3-hydroxybutyrate)-poly(ethyl ethylene phosphate) (PEEP-b-PHB-b-PEEP) have been successfully synthesized through ring-opening polymerization. The structures are confirmed by gel permeation chromatography and NMR analyses. Crystallization investigated by X-ray diffraction reveals that the block copolymer with higher content of poly(ethyl ethylene phosphate) (PEEP) is more amorphous, showing decreased crystallizability. The obtained copolymers self-assemble into biodegradable nanoparticles with a coreshell micellar structure in aqueous solution, verified by the probe-based fluorescence measurements and transmission electronic microscopy (TEM) observation. The hydrophobic poly(3-hydroxybutyrate) (PHB) block serves as the core of the micelles and the micelles are stabilized by the hydrophilic PEEP block. The size and size distribution are related to the compositions of the copolymers. Paclitaxel (PTX) has been encapsulated into the micelles as a model drug and a sustained drug release from the micelles is observed. MTT assay also demonstrates that the block copolymers are biocompatible, rendering these copolymers attractive for drug delivery.

Preparation and characterization of biomimetic adsorbent from poly-3-hydroxybutyrate

Biomimetic adsorbent named as PHBBMA was prepared from lipophilic poly-3-hydroxybutyrate （PHB） by a modified double emulsion solvent evaporation method. PHBBMA, characterized by using scanning electron microscope and nitrogen adsorption/desorption measurements, is porous spherical particles. The characterization with the thermal gravimetric analysis and differential scanning calorimetry, 1 H nuclear magnetic resonance and Fourier transform infrared spectroscopy showed that PHBBMA preparation was a physical process without chemical reaction. The adsorption of PHBBMA for o-nitrochlorobenzene （o-NCB） was fitted better by Langmuir model than by Freundlich model, while the pseudo second-order model fitting was better than the pseudo first-order model fitting. The maximal adsorption capacity of PHBBMA for o-NCB was 57.83 mg/g at 30°C, although its specific surface area （S BET ） was only 8.45 m 2 /g. PHBBMA is a safe and environmental friendly adsorbent with high adsorption capacity because its component is innocuous and biodegradable PHB produced reusing wastes and contaminants, no byproduct can produced, and its ester and hydrocarbyl groups have strong affinity with organochlorine compounds. The further work will focus on the modification and improvement of PHBBMA in order to increase its S BET and adsorption capacity.

Structures and growth mechanisms of poly-(3-hydroxybutyrate) (PHB) crystallized from solution and thin melt film

The spherulitic structures and morphologies of poly-(3-hydroxybutyrate) (PHB) crystallized from a so- lution and a thin melt film were investigated in this study. The formation mechanisms of banded spherulites under different crystallization conditions are proposed. It was found that the formation of banded spherulites was caused by the rhythmic crystal growth of the spherulites and lamellar twisting growth for the polymer crystallization from a thin melt film and a solution, respectively.

基于NOD样受体3炎性小体通路对利拉鲁肽在氧化低密度脂蛋白诱导内皮细胞损伤的作用机制研究

背景动脉粥样硬化是世界范围内引起心脑血管疾病最主要的原因,炎症是目前研究热点,其中NOD样受体3(NLRP3)是研究最为深入的炎症小体。胰高糖素样肽1(GLP-1)受体激动剂有抗动脉粥样硬化作用,具体机制尚不明确。目的研究利拉鲁肽通过拮抗氧化低密度脂蛋白(ox-LDL)诱导的内皮细胞损伤的作用机制。方法2022-03-25—05-19培养人脐静脉内皮细胞(HUVEC),取HUVEC加空白血清作为对照组,100μg/mL的ox-LDL干预HUVEC 48 h作为模型组,100μg/mL的ox-LDL干预HUVEC 24 h后分别加入100、200、400 nmol/L利拉鲁肽处理24 h作为利拉鲁肽低浓度组、利拉鲁肽中浓度组、利拉鲁肽高浓度组。CCK-8法计算细胞增殖率。通过扫描电镜观察焦亡细胞形态。检测乳酸脱氢酶(LDH)活力。酶联免疫吸附试验(ELISA)检测白介素(IL)-1β、IL-18表达水平。蛋白质免疫印迹试验(Western blot)检测NLRP3、接头蛋白凋亡相关斑点样蛋白(ASC)、天冬氨酸蛋白水解酶1(Caspase-1)、焦亡执行蛋白(GSDMD)、N端结构域的焦亡执行蛋白(N-GSDMD)表达水平。结果模型组、利拉鲁肽低浓度组和利拉鲁肽中浓度组细胞增殖率低于对照组,利拉鲁肽低浓度组、利拉鲁肽中浓度组、利拉鲁肽高浓度组细胞增殖率高于模型组(P<0.05)。细胞扫描电镜结果示模型组细胞焦亡明显,利拉鲁肽低浓度组、利拉鲁肽中浓度组、利拉鲁肽高浓度组细胞焦亡情况明显改善。模型组、利拉鲁肽低浓度组LDH活力高于对照组,利拉鲁肽低浓度组、利拉鲁肽中浓度组、利拉鲁肽高浓度组低于模型组(P<0.05)。模型组、利拉鲁肽低浓度组IL-1β表达水平高于对照组,利拉鲁肽中浓度组、利拉鲁肽高浓度组IL-1β表达水平低于模型组(P<0.05);模型组IL-18表达水平高于对照组,利拉鲁肽低浓度组、利拉鲁肽中浓度组、利拉鲁肽高浓度组IL-18表达水平低于模型组(P<0.05)。模型组NLRP3、ASC、Caspase-1、GSDMD、N-GSDMD表达水平高于对照组,利拉鲁肽低浓度组ASC、Caspase-1表达水平高于对照组,利拉鲁肽中浓度组NLRP3、ASC表达水平低于模型组,利拉鲁肽高浓度组NLRP3、ASC、Caspase-1表达水平低于模型组(P<0.05)。结论利拉鲁肽显著抑制ox-LDL诱导的内皮细胞NLRP3炎性小体活化,并且能够抑制内皮细胞的焦亡,具有抗动脉粥样硬化作用。

铀对α-Al_(2)O_(3)中氢与本征点缺陷相互作用的影响

在长期高温服役过程中,铀床的氚渗透泄露问题是聚变堆涉氚系统中需要关注的焦点之一,而一种行之有效的解决思路是在内壁制备阻氚涂层.然而,服役过程中通过热扩散渗入涂层内部的铀可能在阻氚涂层氢行为中起作用,进而影响其服役可靠性.基于此,采用第一性原理计算方法,研究了铀对α-Al_(2)O_(3)中氢与本征点缺陷相互作用的影响.结果发现,铀对α-Al_(2)O_(3)中空位型本征点缺陷及氢相关缺陷的存在形式、电荷态及相对稳定性有重要影响.从形成能观点来看,铀对α-Al_(2)O_(3)中空位型本征点缺陷及氢相关缺陷的形成有利,且α-Al_(2)O_(3)中空位型点缺陷对氢的捕陷能力因铀的引入显著增加.研究结果对α-Al_(2)O_(3)基内壁阻氚涂层在氚工艺系统铀床中应用的可靠性评估具有重要的指导意义.

Effects of Quenching Temperature and Time on Pore Diameter of Poly (3-hydroxybutyrate-co-3-hydroxyhexanoate) Porous Scaffolds and MC3T3-E1 Osteoblast Response to the Scaffolds

Poly（3-hydroxybutyrate-co-3-hydroxyhexanoate） （PHBHHx） scaffolds were prepared by thermally inducing phase separation （TIPS） for bone reconstruction. Scanning electron microscopy and porosity measurements were used to analyze the structure and properties of the scaffolds. The pore diameter of the scaffolds could be easily controlled by changing the quenching temperature and time. The biocompatibility was assessed by examining the proliferation and morphology of MC 3T3-E1 osteoprogenitor cells seeded on the scaffolds. Cultures grown in the presence of a source of phosphate ions showed the formation of a mineralized extracellular matrix. The results indicate that PHBHHx scaffolds prepared using TIPS are a promising candidate for bone reconstruction.

二甲双胍通过NLRP3炎症小体通路对皮肤角质形成细胞增殖和凋亡的双向调节研究

背景扁平苔藓是一种皮肤-黏膜慢性炎症性疾病。因其病因不明,许多患者治疗效果欠佳,严重影响生活质量,有必要深入研究扁平苔藓的发病机制,为其药物筛选提供新靶点。目的探讨二甲双胍通过NLRP3炎症小体通路对皮肤角质形成细胞增殖和凋亡的调控作用。方法实验时间为2020—2023年。体外实验以人永生化角质形成细胞株HaCaT为研究对象,分为4组:对照组、脂多糖(LPS)组(5μg/mL)、二甲双胍组(Met组:10 mmol/L)、LPS与二甲双胍联合组(LPS+Met组:LPS 5μg/mL刺激2 h后,再给予二甲双胍10 mmol/L处理)。体内实验以BALB/c小鼠为研究对象,利用咪喹莫特涂抹小鼠背部皮肤诱导了银屑病样皮炎模型,并制备了二甲双胍乳膏进行治疗,将小鼠随机分为3组:对照组、咪喹莫特组(IMQ组)、咪喹莫特与二甲双胍联合组(IMQ+Met组),每组10只;对照组小鼠于背部涂抹凡士林,IMQ组小鼠于背部涂抹咪喹莫特软膏,IMQ+Met组小鼠于背部涂抹IMQ软膏12 h后再涂抹二甲双胍乳膏;1次/d,连续7 d。采用细胞增殖试剂盒(CCK-8)和流式细胞术检测二甲双胍对HaCaT细胞增殖和凋亡的影响;采用Western Blotting、酶联免疫吸附实验(ELISA)和半胱氨酸天冬氨酸蛋白酶1(Caspase-1)活性实验检测二甲双胍处理HaCaT细胞后NOD样受体蛋白3(NLRP3)炎症小体通路的蛋白表达情况及活性水平;最后采用皮肤组织切片苏木素-伊红(HE)染色和免疫组化检测二甲双胍对咪喹莫特诱导银屑病小鼠皮炎的抗炎效果。结果CCK-8实验结果显示:LPS组、Met组、LPS+Met组HaCaT细胞48 h存活率均低于对照组,而LPS+Met组HaCaT细胞48 h存活率高于LPS组(P<0.05)。流式细胞术结果显示:LPS组、Met组HaCaT细胞48 h G2/M期细胞、细胞凋亡比例均高于对照组,而LPS+Met组HaCaT细胞48 h G2/M期细胞、细胞凋亡比例低于LPS组(P<0.05)。Western Blotting结果显示:LPS组、Met组HaCaT细胞NLRP3炎症小体通路Caspase-1 p40、Caspase-1 p20、白介素(IL)-1β、IL-18蛋白表达均高于对照组,而LPS+Met组HaCaT细胞NLRP3炎症小体通路Caspase-1 p40、Caspase-1 p20、IL-1β、IL-18蛋白表达低于LPS组(P<0.05)。ELISA实验结果显示:LPS组、Met组HaCaT细胞NLRP3炎症小体通路IL-1β、IL-18水平、Caspase-1相对活性均高于对照组,而LPS+Met组HaCaT细胞NLRP3炎症小体通路IL-1β、IL-18水平、Caspase-1相对活性低于LPS组(P<0.05)。皮肤组织切片HE染色显示:IMQ+Met组小鼠二甲双胍涂抹明显改善了咪喹莫特对皮肤的损害。免疫组化结果显示:IMQ+Met组小鼠则显著降低了NLRP3、Caspase-1、IL-1β和IL-18的表达。结论二甲双胍通过NLRP3炎症小体通路双向调节皮肤角质形成细胞的增殖和凋亡,并能够改善咪喹莫特诱导的银屑病样小鼠的皮肤损害,有望为二甲双胍临床上用于治疗扁平苔藓提供理论依据。