Keratin17联合HPV E6/E7 mRNA对宫颈低度鳞状上皮内病变转归的预测价值

目的研究Keratin17(Krt17)联合人乳头瘤病毒(human papillomavirus,HPV)E6/E7 mRNA对宫颈低度鳞状上皮内病变(low-grade squamous intraepithelial lesions,LSIL)转归的预测价值。方法选择2020年1月~2021年9月期间诊断为LSIL并完成24个月随访的患者,根据第24个月复诊时病变组织学检查结果进行分组,LSIL消退或维持的患者为病变未进展组,LSIL进展至更高级别的患者为病变进展组。比较2组患者首次确诊时临床资料、Krt17 mRNA表达水平、E6/E7拷贝数的差异,采用多因素logistic逐步回归分析LSIL病变进展的危险因素,采用ROC曲线分析Krt17联合E6/E7对LSIL病变进展的预测价值。结果98例LSIL患者中病变进展者19例、占19.39%,病变未进展者79例、占80.61%;病变进展组的LSIL患者年龄、吸烟比例、绝经比例、Krt17 mRNA表达水平、E6/E7拷贝数高于病变未进展组(P<0.05);多因素logistic逐步回归分析显示,年龄≥45岁、吸烟、Krt17 mRNA表达水平增加、E6/E7拷贝数增加是LSIL病变进展的危险因素;ROC曲线分析显示Krt17和E6/E7对LSIL病变进展具有预测价值,两指标联合预测的灵敏度和特异度分别为81.01%和94.74%。结论Krt17联合HPV E6/E7对LSIL病变进展具有一定预测价值。

Artificial nerve graft constructed by coculture of activated Schwann cells and human hair keratin for repair of peripheral nerve defects

Studies have shown that human hair keratin(HHK) has no antigenicity and excellent mechanical properties. Schwann cells, as unique glial cells in the peripheral nervous system, can be induced by interleukin-1β to secrete nerve growth factor, which promotes neural regeneration. Therefore, HHK with Schwann cells may be a more effective approach to repair nerve defects than HHK without Schwann cells. In this study, we established an artificial nerve graft by loading an HHK skeleton with activated Schwann cells. We found that the longitudinal HHK microfilament structure provided adhesion medium, space and direction for Schwann cells, and promoted Schwann cell growth and nerve fiber regeneration. In addition, interleukin-1β not only activates Schwann cells, but also strengthens their activity and increases the expression of nerve growth factors. Activated Schwann cells activate macrophages, and activated macrophages secrete interleukin-1β, which maintains the activity of Schwann cells. Thus, a beneficial cycle forms and promotes nerve repair. Furthermore, our studies have found that the newly constructed artificial nerve graft promotes the improvements in nerve conduction function and motor function in rats with sciatic nerve injury, and increases the expression of nerve injury repair factors fibroblast growth factor 2 and human transforming growth factor B receptor 2. These findings suggest that this artificial nerve graft effectively repairs peripheral nerve injury.

Close-loop recyclable and flexible halide perovskite@wool keratin sensor with piezoelectric property

Halide perovskites with excellent piezoelectric properties,but their poor stability hinders their largescale application.Herein,a sandwich-structured halide perovskite flexible sensor with good stability was developed according to a three-step procedure as follows:(ⅰ) in-situ growth of wool keratinCsPbBr_(3)(WK-CsPbBr_(3)) using wool keratin in interfacial passivation and coating,(ⅱ) electrospinning of a wool keratin-CsPbBr_(3)/polyacrylonitrile(WCP) nanofiber film,and(ⅲ) coating of the WCP nanofiber with polydimethylsiloxane(PDMS) to obtain a sensor(WCPP).The sensor could generate a piezoelectric voltage of 7.8 V at a pressure of 6 kPa in the stages of pressing and releasing,and the output characteristics did not decline even after 10,000 cycles.Compared to the 4-month stability of the perovskite sensor,WCPP sensor exhibited the output performance even after 16 months,which indicated that wool keratin as a multidentate improved the stability of the halide perovskite.Additionally,the sensor displayed a self-cleaning property and could also light up 14 commercial LEDs.The close-loop recycling of the lead halide perovskite was achieved by dissolving the WCP nanofiber film in DMF and then reelectrospinning.Therefore,the method proposed is a step forward for achieving the commercialization of WK-CsPbBr_(3) and providing new avenues for further utilization of wool waste.

Keratinase production and keratin degradation by a mutant strain of Bacillus subtilis

A new feather-degrading bacterium was isolated from a local feather waste site and identified as Bacillus subtilis based on morphological, physiochemical, and phylogenetic characteristics. Screening for mutants with elevated keratinolytic activity using N-methyl-N＇-nitro-N-nitrosoguanidine mutagenesis resulted in a mutant strain KD-N2 producing keratinolytic activity about 2.5 times that of the wild-type strain. The mutant strain produced inducible keratinase in different substrates of feathers, hair, wool and silk under submerged cultivation. Scanning electron microscopy studies showed the degradation of feathers, hair and silk by the keratinase. The optimal conditions for keratinase production include initial pH of 7.5, inoculum size of 2% （v/v）, age of inoculum of 16 h, and cultivation at 23 ℃. The maximum keratinolytic activity of KD-N2 was achieved after 30 h. Essential amino acids like threonine, valine, methionine as well as ammonia were produced when feathers were used as substrates. Strain KD-N2, therefore, shows great promise of finding potential applications in keratin hydrolysis and keratinase production.

慢性异体肾移植病人肾纤维化组织中MMP-2、TIMP-1、Vimentin、Keratin免疫组化定量分析

目的:探讨慢性异体肾移植病人肾纤维化组织中基质金属蛋白酶-2(MMP-2)、金属蛋白酶抑制物(TIMP-1)、波形蛋白(Vimentin)和角蛋白(Keratin)的表达与肾纤维化间的关系。方法:收集我院18例肾移植后不同程度肾纤维化病人及10例正常肾组织,进行MMP-2、TIMP-1、Vimentin及Keratin的免疫组化定量检测分析。结果:肾纤维化早期,与正常肾组织对比,抗MMP-2和Keratin呈显较强免疫阳性反应,且量增加;随肾纤维化程度增加,抗MMP-2和Keratin免疫染色阳性反应减弱,量减少,甚至出现阴性;抗TIMP-1和Vimentin免疫染色阳性增强,并随着纤维化进展而量增加。结论:由肾纤维化组织局部Vimentin阳性与相关细胞产生并分泌的细胞因子以诱导MMP-2、TIMP-1的活性改变在慢性肾移植肾病患者的肾纤维化过程中具有关键性作用。

人细胞角蛋白Keratin 14的生物信息学分析

人细胞角蛋白Keratin 14是I型中间丝蛋白家族的亚群,参与形成上皮细胞的细胞骨架。利用生物信息学分析Keratin 14基因的启动子区、CpG岛及其所编码的蛋白质的理化性质、结构特点和功能特征。结果表明,Keratin 14基因存在两个启动子区,启动子区不存在CpG岛;Keratin 14全长472个氨基酸,其等电点为5.09,是一个无跨膜结构的亲水性蛋白质;角蛋白Keratin 14二级结构具7个α螺旋和5个β折叠,预测三级结构的拉曼图分析显示其结构稳定;与Keratin 14相互作用的蛋白质主要是角蛋白,而且Keratin 14还参与细胞的生长和分裂,有促进细胞分化的作用;此外,Keratin 14的氨基酸序列在哺乳动物间的同源性较高。上述对角蛋白Keratin 14的表达、结构和功能的预测可以为研究其在生命过程中的作用提供重要的信息。

Isolation,Screening and Primary Identification of a Keratin-degrading Fungus

[Objective] The paper was to provide new germplasm sources for efficient and economical degradation and utilization of animal keratin.[Method] The keratin-degrading fungus was isolated,screened and primarily identified by using the combination method of traditional isolation and screening,solid culture-medium degradation and animal test.[Result] A strain of non-pathogenic filamentous fungi with high degradation efficiency was obtained,which was preliminarily identified to be a species in Mucoraceae.[Conclusion] The discovery of the strain enriched the family members of keratin-degrading fungus,and provided new germplasm resources for degradation and utilization of animal keratin.

Keratin和CEA在前列腺病变组织的分布

本文用CEA和Keratin单克隆抗体,对前列腺正常组织、结节性增生和癌各15例进行标记,其中15例前列腺癌随访2年以上,标记方法为BA法。结果,CEA在正常前列腺组织、结节性增生和癌中含量低,阳性率低,提示CEA非识别前列腺癌的理想标记物。Keratin在正常前列腺组织、结节性增生和癌的所有病例中均为阳性。三者在染色强度上无显著差异。不同分化程度的癌在染色强度上也无显著差异。Keratin广泛分布于前列腺癌的上皮细胞内,间质标记均为阴性,对鉴别前列腺上皮性和非上皮性肿瘤是有意义的。

Preparation and Characteristics of Wool Keratin Aqueous Solution and Sponge

Wool keratin has broad application prospects in biomedical materials, tissue engineering, and other fields. To obtain porous wool keratin membrane with good performance, and lay the foundation for its application in biological fields in the future, wool keratin aqueous solution and sponge were prepared and their characters were discussed. Wool fiber was dissolved with a mixture of urea, β-mercapitoethanol, sodium dodecyl sulfate(SDS) and water, and stable keratin aqueous solution was prepared through filtration and dialysis. Dissolution rate under different conditions was discussed. The results show that dissolution rate increases with the increase of dissolving temperature, reduction β-mercaptoethanol and assistant agent urea concentration and the addition of SDS. SDS polyacrylamide gel electrophoresis (SDS PAGE) shows the major molecular weight of the aqueous keratin solution is between 44300 u and 66400 u. Amino acid analysis shows the cysteine acid content of the keratin solution decreases obviously. Wool keratin sponge was made from the keratin solution with freeze drying method and its structure and characters were studied with scanning electron microscopy(SEM) and Fourier transform infrared spectrometer (FTIR). The results indicate that keratin sponge has evident pores structure, and the conformation of the sponge is β-sheet.

The keratin intermediate filament-like system in maize protoplasts

The application of Penman's method of cell fractionation to plant protoplasts leads to our finding of keratin intermediate filament(IF)-like system in maize protoplasts,which was identified by using immunogold labelling with monoclonal antibody of cytokeratin from animal cells.Many gold particles were found to be bound on filaments,linked by 3 nm filaments.After further digestion and extraction with DNase I and ammonium sulphate.IF-like framework-lamina-nuclear matrix system was shown under electron microscope.That IF system exists in plant protoplasts just like in animal cells,and their main component is keratin-like protein.

结直肠癌中Keratin 17的表达及其临床预后价值

目的分析角蛋白17(Keratin 17,KRT17)在结直肠癌(colorectal cancer,CRC)中的表达及其临床预后价值。方法采用生物信息学方法分析KRT17在CRC数据库中的表达及预后价值;进一步,采用免疫组织化学技术检测KRT17蛋白在95对CRC临床样本组织中的表达水平,并分析其表达与患者临床病理特征及预后的相关性。结果生物信息分析发现,KRT17在CRC组织中的表达水平显著高于正常组织,其表达与肿瘤病理类型、淋巴结转移及TNM分期相关,并预示较差的总生存期(P均<0.05)。免疫组化验证显示,与癌旁组织相比,蛋白在CRC组织中的表达显著上调(t=45.704,P<0.001),与生物信息学分析结果保持一致;KRT17高表达与肿瘤分化程度、浸润深度、淋巴结转移、TNM分期、淋巴脉管浸润及神经侵犯显著相关(P_(均 )0.05);生存分析显示,KRT17高表达组CRC患者的总生存期显著低于低表达组(χ^(2)=8.510,P=0.004);进一步的单因素和多因素分析结果表明,KRT17高表达是影响CRC患者总生存期的一个独立危险因素(HR=2.015,95%CI:1.219~4.457,P=0.018)。结论KRT17在CRC组织中表达显著上调,且其高表达预示着肿瘤进展及不良预后,有望成为CRC患者预后评估的生物标志物。

Keratin13基因在喉癌发生中的作用

目的 探讨keratin 13基因在喉癌发生中的作用。方法 在keratin 13基因内部及附近选择 5个微卫星引物进行LOH分析 ,于DNA水平间接检测 10 0例喉癌患者中该基因的缺失情况。结果 5个STR位点均存在LOH ,其中D17S196 4E、D17S2 0 92、D17S791、D17S16 6 5及D17S80 8位点的LOH频率分别为 30 4 8%、2 6 0 2 %、2 1 6 2 %、37 6 6 %和 2 1 5 1%,以D17S16 6 5位点的LOH频率最高 ,杂合性丢失与临床分期无显著相关。结论 Keratin 13基因在喉癌的发生中具有重要作用 ,具体机制有待进一步研究。

低温冷冻对皮肤α-tubulin、β-tubulin和cytoskeratin表达的影响

目的:探讨低温冷冻对皮肤骨架蛋白中α-微管蛋白(α-tubu lin)、β-微管蛋白(β-tubu lin)和高分子量角蛋白(cytoskeratin)表达的影响,从而进一步揭示皮肤低温损伤的机制。方法:用-αtubu lin、β-tubu lin、cytoskeratin抗体对5种储存条件下的皮肤作免疫组化染色,采用计算机图像分析技术进行定量分析。并进一步采用透射电镜观察-αtubu lin、β-tubu lin、cytoskeratin的超微结构的变化。结果:α-tubu lin、β-tubu lin、cytoskeratin在4℃组、-20℃组、-80℃组均表达显著下降,且超微形态结构及分布改变明显。在-196℃组储存时三种成分含量下降较少,形态改变亦不显著。结论:皮肤的低温损伤与骨架蛋白-αtubu lin、β-tubu lin、cytoskeratin的破坏有关。

Effect of glycosides of Cistanche on the expression of mitochondrial precursor protein and keratin type Ⅱ cytoskeletal 6A in a rat model of vascular dementia

Glycosides of Cistanche（GC）is a preparation used extensively for its neuroprotective effect against neurological diseases,but its mechanisms of action remains incompletely understood.Here,we established a bilateral common carotid artery occlusion model of vascular dementia in rats and injected the model rats with a suspension of GC（10 mg/kg/day,intraperitoneally）for 14 consecutive days.Immunohistochemistry showed that GC significantly reduced p-tau and amyloid beta（Aβ）immunoreactivity in the hippocampus of the model rats.Proteomic analysis demonstrated upregulation of mitochondrial precursor protein and downregulation of keratin type II cytoskeletal6A after GC treatment compared with model rats that had received saline.Western blot assay confirmed these findings.Our results suggest that the neuroprotective effect of GC in vascular dementia occurs via the promotion of neuronal cytoskeleton regeneration.

A mutation in the type Ⅱ hair keratin KRT86 gene in a Han family with monilethrix

Monilethrix, a congenital disease of hair, is usually associated with mutations in keratin genes, like KRT81, KRT83 and KRT86. We conducted this study to investigate the mutation of type Ⅱ human basic hair keratin hHb/ KRT gene in a Han family with monilethrix and obtain information for potential pathogenic mechanism study of monilethrix. Peripheral blood samples were drawn for genomic DNA detection. Exon 1 and exon 7 of the KRT81, KRT83 and KRT86 genes were amplified by PCR. All PCR products were sequenced directly using an ABI 310 DNA sequencer. These sequences were aligned with the standard sequences in GenBank using the BLAST software. PCR products were digested with restriction endonuclease and restriction fragment length polymorphism （RFLP） analysis was performed. In this study, we identified one novel mutation, which is a heterozygous transitional mutation of G→A at position 1,289 in exon 7 of the KRT86 gene [R430Q （KRT86）]. RFLP assays for the novel mutation excluded the possibility of polymorphism. The R430Q mutation of the KRT86 gene may be pathogenic for monilethrix. Meanwhile, we did not find any novel mutation or recurrent mutation in exons 1 and 7 of KRT81 and KRT83 and exon 1 of KRT86. There is a potential pathogenic gene in the subjects and our results expand the spectrum of mutations in the hHb6 gene.

Tailoring the Meso-Structure of Gold Nanoparticles in Keratin-Based Activated Carbon Toward High-Performance Flexible Sensor

Flexible biosensors with high accuracy and reliable operation in detecting pH and uric acid levels in body fluids are fabricated using well-engineered metaldoped porous carbon as electrode material.The gold nanoparticles@N-doped carbon in situ are prepared using wool keratin as both a novel carbon precursor and a stabilizer.The conducting electrode material is fabricated at 500℃ under customized parameters,which mimics A-B type(two different repeating units) polymeric material and displays excellent deprotonation performance(pH sensitivity).The obtained pH sensor exhibits high pH sensitivity of 57 mV/pH unit and insignificant relative standard deviation of 0.088%.Conversely,the composite carbon material with sp^2 structure prepared at 700℃ is doped with nitrogen and gold nanoparticles,which exhibits good conductivity and electrocatalytic activity for uric acid oxidation.The uric acid sensor has linear response over a range of 1-150 μM and a limit of detection 0.1 μM.These results will provide new avenues where biological material will be the best start,which can be useful to target contradictory applications through molecular engineering at mesoscale.

Peri-implant keratinized gingiva augmentation using xenogeneic collagen matrix and platelet-rich fibrin:A case report

BACKGROUND Keratinized gingival insufficiency is a disease attributed to long-term tooth loss,can severely jeopardizes the long-term health of implants.A simple and effective augmentation surgery method should be urgently developed.CASE SUMMARY A healthy female patient,45-year-old,requested implant restoration of the her left mandibular first molar and second molar.Before considering a stage II,as suggested from the probing depth measurements,the widths of the mesial,medial,and distal buccal keratinized gingiva of second molar(tooth#37)were measured and found to be 0.5 mm,0.5 mm,and 0 mm,respectively.This suggested that the gingiva was insufficient to resist damage from bacterial and mechanical stimulation.Accordingly,modified apically repositioned flap(ARF)surgery combined with xenogeneic collagen matrix(XCM)and platelet-rich fibrin(PRF)was employed to increase the width of gingival tissue.After 1 mo of healing,the widths of mesial,medial,and distal buccal keratinized gingiva reached 4 mm,4 mm,and 3 mm,respectively,and the thickness of the augmented mucosa was 4.5 mm.Subsequently,through the second-stage operation,the patient obtained an ideal soft tissue shape around the implant.CONCLUSION For cases with keratinized gingiva widths around implants less than 2mmthe soft tissue width and thickness could be increased by modified ARF surgery combined with XCM and PRF.Moreover,this surgery significantly alleviated patients’pain and ameliorated oral functional comfort.

Association of keratin 8/18 variants with non-alcoholic fatty liver disease and insulin resistance in Chinese patients: A case-control study

AIM To test the hypothesis that K8/K18 variants predispose humans to non-alcoholic fatty liver disease(NAFLD) progression and its metabolic phenotypes. METHODS We selected a total of 373 unrelated adult subjects from our Physical Examination Department, including 200 unrelated NAFLD patients and 173 controls of both genders and different ages. Diagnoses of NAFLD were established according to ultrasonic signs of fatty liver. All subjects were tested for population characteristics, lipid profile, liver tests, as well as glucose tests. Genomic DNA was obtained from peripheral blood with a DNeasy Tissue Kit. K8/K18 coding regions were analyzed, including 15 exons and exon-intron boundaries. RESULTS Among 200 NAFLD patients, 10(5%) heterozygouscarriers of keratin variants were identified. There were 5 amino-acid-altering heterozygous variants and 6 non-coding heterozygous variants. One novel aminoacid-altering heterozygous variant(K18 N193S) and three novel non-coding variants were observed(K8 IVS5-9A→G, K8 IVS6+19G→A, K18 T195T). A total of 9 patients had a single variant and 1 patient had compound variants(K18 N193S+K8 IVS3-15C→G). Only one R341 H variant was found in the control group(1 of 173, 0.58%). The frequency of keratin variants in NAFLD patients was significantly higher than that in the control group(5% vs 0.58%, P = 0.015). Notably, the keratin variants were significantly associated with insulin resistance(IR) in NAFLD patients(8.86% in NAFLD patients with IR vs 2.5% in NAFLD patients without IR, P = 0.043).CONCLUSION K8/K18 variants are overrepresented in Chinese NAFLD patients and might accelerate liver fat storage through IR.

An ultrasonic-ionic liquid process for the efficient acid catalyzed hydrolysis of feather keratin

A novel efficient method for hydrolyzing feather keratin using an ultrasonic-ionic liquid coupling process has been developed, with reaction conditions optimized using response surface analysis of data obtained from single factor optimization studies. Ultrasonic irradiation(225 W power) of feathers in 8.4 mol·L^(-1) hydrochloric acid containing 1-butyl-3-methylimidazolium chloride as a cosolvent at 80 °C for 1.4 h, followed by heating at 110 °C for 8.3 h, resulted in hydrolysis of their keratin component in an excellent 83.1% yield. Compared with previous methods, this new method employs reduced amounts of hydrochloric acid, shorter reaction time, and affords amino acid hydrolysis products in higher yield.