Histone H3K27me3 methylation regulates the expression of secreted proteins distributed at fast-evolving regions through transcriptional repression of transposable elements

The fine-tuned expression dynamics of the effector genes are pivotal for the transition from vegetative growth to host colonization of pathogenic filamentous fungi.However,mechanisms underlying the dynamic regulation of these genes remain largely unknown.Here,through comparative transcriptome and chromatin immunoprecipitation sequencing(ChIP-seq)analyses of the methyltransferase PoKmt6 in rice blast fungus Pyricularia oryzae(syn.Magnaporthe oryzae),we found that PoKmt6-mediated H3K27me3 deposition was enriched mainly at fast-evolving regions and contributed to the silencing of a subset of secreted proteins(SP)and transposable element(TE)families during the vegetative growth of P.oryzae.Intriguingly,we observed that a group of SP genes,which were depleted of H3K27me3 modification,could also be silenced via the H3K27me3-mediated repression of the nearby TEs.In conclusion,our results indicate that H3K27me3 modification mediated by PoKmt6 regulates the expression of some SP genes in fast-evolving regions through the suppression of nearby TEs.

Computational Analysis of Signal Peptide-Dependent Secreted Proteins in Saccharomyces cerevisiae

Computer based software such as the SignalP v3.0, TargetP v1.01, big-PI predictor and TMHMM v2.0 were combined to predict the signal peptides, and the signal peptide-dependent secreted proteins among the 6 700 ORFs in genome of Saccharomyces cerevisiae. The results showed that 163 proteins were the secreted ones containing signal peptides, and they were secreted via Sec pathway. Among the 163 predicted secreted proteins, the signal peptides of 47 secreted proteins included only the H-domain and C-domain, without N-domain, but the signal peptides of other 116 secreted proteins included all the three domains. There were differences in the constitution of signal peptides between the secreted proteins of S. cerevisiae and of Candida albicans, but the length and amino acids types of their signal peptides were similar in general. Few of the same signal peptides occurred in the secreted proteins of S. cerevisiae genome, and the homology could be compared among the secreted proteins with the same signal peptides. The BLAST 2 SEQUENECES and CLUSTAL W were used to align the two protein sequences and multi-protein sequences, respectively. The alignment result indicated that homology of these sequences with the same signal peptide was very highly conservative in amino acid of complete gene. The effect of the signal peptides in S. cerevisia on expression of foreign eukaryotic secreted proteins is discussed in this paper.

An Improved Approach for Rapidly Identifying Different Types of Gram-Negative Bacterial Secreted Proteins

Protein secretion plays an important role in bacterial lifestyles. In Gram-negative bacteria, a wide range of proteins are secreted to modulate the interactions of bacteria with their environments and other bacteria via various secretion systems. These proteins are essential for the virulence of bacteria, so it is crucial to study them for the pathogenesis of diseases and the development of drugs. Using amino acid composition (AAC), position-specific scoring matrix (PSSM) and N-terminal signal peptides, two different substitution models are firstly constructed to transform protein sequences into numerical vectors. Then, based on support vector machine (SVM) and the “one to one”?algorithm, a hybrid multi-classifier named SecretP v.2.2 is proposed to rapidly and accurately?distinguish different types of Gram-negative?bacterial secreted proteins. When performed on the same test set for a comparison with other methods, SecretP v.2.2 gets the highest total sensitivity of 93.60%. A public independent dataset is used to further test the power of SecretP v.2.2 for predicting NCSPs, it also yields satisfactory results.

A Structure Similarity Analysis of Secreted Proteins in Magnaporthe oryzae and Its Host Oryza sativa

The structure similarity of secreted proteins in rice blast fungus Magnaporthe oryzae and its host Oryza sativa was analyzed. One thousand two hundred and forty one proteins were predicted as secreted proteins using four algorithms based on 11 074 proteins in genome of M. oryzae. One hundred and forty six secreted proteins（ 11. 8% of M. oryzae secretome） were aligned with 116 rice proteins（ 0. 21% of 56 278 rice proteins） using BLAST search on rice genome. One hundred sixteen rice similar proteins participated in rice cell wall modification（ cell wall associated enzymes） and signal transduction（ proteases）. These results imply that both cell wall involved proteins and signal transduction are probably hijacks pathway between host pants and pathogenic fungi. Because these proteins are highly conserved among fungi and plants,the express patterns of these protein coding genes during the interaction process are valuable to study in detail.

Proteomic mapping of secreted proteins of Trichoderma spp.

A series of highly taxonomically diverse Trichoderma strains were investigated using proteomic approaches, to investigate the utility of protein profiles as taxonomic markers and to identify proteins of potential economic importance. Initial studies have focused on a comparison of single strains of T. aureoviride, T. saturnisporum, T. polysporum, T. longbrachiatum and T. spirale, along with two strains of T. harzianum. All seven strains were grown in synthetic medium supplemented with 2%(w/v) glycerol, to maximize the diversity of extracellular protein production. Samples of secreted protein were separated by 2D gel electrophoresis and will be characterized by MALDI-TOF peptide fingerprinting.

Secreted Frizzled-Related Protein 5 (SFRP5) in Patients with Obstructive Sleep Apnea

Objective Obstructive sleep apnea (OSA) is closely related to obesity, insulin resistance and inflammation. Secreted frizzled-related protein 5 (SFRP5) is a recently discovered adipokine. It is involved in insulin resistance and inflammation in obesity. This study aimed at evaluating the association between SFRP5and sleeping characteristics as well as biochemical parameters of OSA patients.Methods This was a prospective case control study. Nondiabetic OSA patients and controls were consecutively recruited and divided into three groups: OSA group, apnea–hypopnea Index (AHI)≥5/h; healthy controls with normal body mass index (BMI); obese controls without OSA, and BMI > 24.0 kg/m2. All participants underwent polysomnography (PSG). Plasma SFRP5 was examined using enzyme-linked immunosorbent assay (ELISA). Blood biochemical examinations, including fasting blood glucose (FBG), lipid profile, hypersensitive Creactive protein (hsCRP), were performed early in the morning after PSG. Patients with severe OSA were treated with nasal continuous positive airway pressure (nCPAP), and plasma SFRP5 was repeatedly measured for comparison.Results Sixty-eight subjects were enrolled in the study, including 38 patients of OSA, whose medium AHI was 58.70 /h (36.63, 71.15), 20 obese controls, and 10 healthy controls. The plasma SFRP5 level of OSA patients was not significantly different from that of healthy controls or obese controls. In OSA patients, SFRP5 level correlated positively with triglyceride level (r=0.447, P=0.005) and negatively with LDL-cholesterol level and HDLcholesterol level (r=?0.472 and P=0.003; r=?0.478 and P=0.002; respectively). SFRP5 level was not found correlating with FBG, AHI, or any of nocturnal hypoxia parameters. After overnight nCPAP treatment, plasma SFRP5 levels of OSA patients did not change significantly (t=1.557, P = 0.148) compared to that of pretreatment.Conclusions In nondiabetic OSA patients, plasma SFRP5 is associated with the lipid profile. However,no correlation was observed between SFRP5 and FBG or sleep parameters. The SFRP5 level of OSA patients did not differ from that of non-OSA individuals in our study.

Aberrant methylation of secreted protein acidic and rich in cysteine gene and its significance in gastric cancer

BACKGROUND Aberrant methylation in DNA regulatory regions could downregulate tumor suppressor genes without changing the sequences.However,our knowledge of secreted protein acidic and rich in cysteine(SPARC)and its aberrant methylation in gastric cancer(GC)is still inadequate.In the present research,we performed fundamental research to clarify the precise function of methylation on SPARC and its significance in GC.AIM To investigate promoter methylation and the effects of the SPARC gene in GC cells and tissues and to evaluate its clinical significance.METHODS Plasmids that overexpressed the SPARC gene were transfected into human GC BGC-823 cells;non-transfected cells were used as a control group(NC group).Quantitative real-time polymerase chain reaction and western blotting(WB)were then used to detect the expression of SPARC.Methylation-specific polymerase chain reaction was executed to analyze the gene promoter methylation status.Cell viability was measured by the cell counting kit-8 assay.The migration and invasion ability of cells were detected by scratch assays and transwell chamber assays,respectively.Cell cycle events and apoptosis were observed with a flow cytometer.RESULTS The expression of SPARC mRNA in GC tissues and cells was significantly lower and showed differing degrees of hypermethylation,respectively,than that in normal adjacent tissues and control cells.Treatment with 5-Aza-2’-deoxycytidine(5-Aza-Cdr)was able to restore the expression of SPARC and reverse promoter hypermethylation.Overexpression of the SPARC gene significantly inhibited proliferation,migration,and invasion of GC cells,while also causing cell cycle arrest and apoptosis;the NC group exhibited the opposite effects.CONCLUSION This study demonstrated that SPARC could function as a tumor suppressor and might be silenced by promoter hypermethylation.Furthermore,in GC cells,SPARC inhibited migration,invasion,and proliferation,caused cell cycle arrest at the G0/G1 phase,and promoted apoptosis.

Hypermethylation and aberrant expression of Wnt antagonist secreted frizzled-related protein 1 in gastric cancer

瞄准：识别分泌卷发相关的蛋白质的甲基化 1 (SFRP1 ) 在胃的癌症并且到调查有病人的临床的病理学的特征的 SFRP1 和它的关联的异常表示。方法：我们在 3 胃的癌症房间线 SGC-7901 决定了 SFRP1 甲基化和 SFRP1 mRNA 表示， BGC-823， HGC-27，从 52 个主要胃的癌症标本和匹配的肿瘤由甲基化的邻近的织物标本特定(MSP ) PCR 和 RT-PCR 分别地。菲希尔的准确测试被用来分析在临床的病理学的数据和 SFRP1 的异常表示之间的统计协会。结果：在 3 根癌症房间线， BGC-823 和 HGC-27 有甲基化 SFRP1 并且失去了 SFRP1 mRNA 表示。有 demethylating 代理人的 BGC-823 和 HGC-27 的术后疗法， 5-aza-2'-deoxycytidine， SFRP1 被重新表示。在 52 个主要胃的癌症标本和匹配的肿瘤邻近的组织标本， SFRP1 的 hypermethylation 在 23 被检测(44%) 并且 8 (15%) 标本分别地(c2 = 10.34， P 【 0.01 ) 。SFRP1 表示的损失在 17 被检测(33%) 并且 6 (12%) 标本分别地(c2 = 6.75， P 【 0.01 ) 。在 SFRP1 hypermethylation 和 SFRP1 表示损失之间有重要关联。SFRP1 表示也与肿瘤舞台和淋巴节点地位，然而并非与耐心的性别，年龄和组织学的类型显著地被相关。结论：在激活的 SFRP1 是主要 hypermethylation 在胃的癌症引起的一个普通、早的事件。SFRP1 表示损失可以在主要胃的癌症与瘤转移被相关。

Hypermethylation and expression regulation of secreted frizzled-related protein genes in colorectal tumor

AIM: To investigate the functions of promoter hyper- methylation of secreted frizzled-related proteins (sFRPs) genes in colorectal tumorigenesis and progression. METHODS: The promoter hypermethylation and expression of sFRP genes in 72 sporadic colorectal carcinomas, 33 adenomas, 18 aberrant crypt foci (ACF) and colorectal cancer cell lines RKO, HCT116 and SW480 were detected by methylation-specific PCR and reverse transcription PCR, respectively. RESULTS: None of the normal colorectal mucosa tissues showed methylated bands of any of four sFRP genes. sFRP1, 2, 4 and 5 were frequently methylated in colorectal carcinoma, adenoma and ACF (sFRP1 > 85%, sFRP2 >75%, sFRP5 > 50%), and the differences between three colorectal tissues were not significant (P > 0.05). Methylation in colorectal tumors was more frequent than in normal mucosa and adjacent normal mucosa. The mRNA of sFRP1-5 genes was expressed in all normal colorectal mucosa samples. Expression of sFRP1, 2, 4 and 5 and sFRP1 , 2 and 5 was downregulated in carcinoma and adenoma, respectively. The downregulation of sFRP2, 4 and 5 was more frequent in carcinoma than in adenoma. Expression of sFRP3 which promoter has no CpG island was downregulated in only a few of colorectal tumor samples (7/105). The downregulation of sFRP1, 2, 4 and 5 expression was significantly associated with promoter hypermethylation in colorectal tumor. After cells were treated by DAC/TSA combination, the silenced sFRP mRNA expression could be effectively re-expressed in colorectal cancer cell lines.CONCLUSION: Hypermethylation of sFRP genes is acommon early event in the evolution of colorectal tumor, occurring frequently in ACF, which is regarded as the earliest lesion of multistage colorectal carcinogenesis. It appears to functionally silence sFRP genes expression. Methylation of sFRP1, 2 and 5 genes might serve as indicators for colorectal tumor.

Mannogalactoglucan from mushrooms protects pancreatic islets via restoring UPR and promotes insulin secretion in TIDM mice

Type 1 diabetes mellitus(T1DM) lacks insulin secretion due to autoimmune deficiency of pancreaticβ-cells.Protecting pancreatic islets and enhancing insulin secretion has been therapeutic approaches.Mannogalactoglucan is the main type of polysaccharide from natural mushroom,which has potential medicinal prospects.Nevertheless,the antidiabetic property of mannogalactoglucan in T1DM has not been fully elucidated.In this study,we obtained the neutral fraction of alkali-soluble Armillaria mellea polysaccharide(AAMP-N) with the structure of mannogalactoglucan from the fruiting body of A.mellea and investigated the potential therapeutic value of AAMP-N in T1DM.We demonstrated that AAMP-N lowered blood glucose and improved diabetes symptoms in T1DM mice.AAMP-N activated unfolded protein response(UPR) signaling pathway to maintain ER protein folding homeostasis and promote insulin secretion in vivo.Besides that,AAMP-N promoted insulin synthesis via upregulating the expression of transcription factors,increased Ca^(2+) signals to stimulate intracellular insulin secretory vesicle transport via activating calcium/calmodulin-dependent kinase Ⅱ(CamkⅡ) and cAMP/PKA signals,and enhanced insulin secretory vesicle fusion with the plasma membrane via vesicle-associated membrane protein 2(VAMP2).Collectively,these studies demonstrated that the therapeutic potential of AAMP-N on pancreatic islets function,indicating that mannogalactoglucan could be natural nutraceutical used for the treatment of T1DM.

Diagnostic and prognostic value of secreted protein acidic and rich in cysteine in the diffuse large B-cell lymphoma

BACKGROUND Secreted protein acidic and rich in cysteine(SPARC)is an extracellular matrixassociated protein.Studies have revealed that SPARC is involved in the cell interaction and function including proliferation,differentiation,and apoptosis.However,the role of SPARC in cancer is controversial,as it was reported as the promoter or suppressor in different cancers.Further,the role of SPARC in lymphoma is unclear.AIM To identify the expression and significance of SPARC in lymphoma,especially in diffuse large B-cell lymphoma(DLBCL).METHODS The expression analysis of SPARC in different cancers was evaluated with Oncomine.The Brune,Eckerle,Piccaluga,Basso,Compagno,Alizadeh,and Rosenwald datasets were included to evaluate the mRNA expression of SPARC in lymphoma.The Cancer Genome Atlas(TCGA)-DLBCL was used to analyze the diagnostic value of SPARC in DLBCL.The Compagno and Brune DLBCL datasets were used for validation.Then,the diagnostic value was evaluated with the receiver operating characteristic(ROC)curve.The Kaplan-Meier plot was conducted with TCGA-DLBCL,and the ROC analysis was performed based on the survival time.Further,the overall survival analysis based on the level of SPARC expression was performed with the GSE4475 and E-TABM-346.The Gene Set Enrichment Analyses(GSEA)was performed to make the underlying mechanism-regulatory networks.RESULTS The pan-cancer analysis of SPARC showed that SPARC was highly expressed in the brain and central nervous system,breast,colon,esophagus,stomach,head and neck,pancreas,and sarcoma,especially in lymphoma.The overexpression of SPARC in lymphoma,especially DLBCL,was confirmed in several datasets.The ROC analysis revealed that SPARC was a valuable diagnostic biomarker.More importantly,compared with DLBCL patients with low SPARC expression,those with higher SPARC expression represented a higher overall survival rate.The ROC analysis showed that SPARC was a favorable prognostic biomarker for DLBCL.Results of the GSEA confirmed that the high expression of SPARC was closely associated with focal adhesion,extracellular matrix receptor interaction,and leukocyte transendothelial migration,which suggested that SPARC may be involved in the regulation of epithelial-mesenchymal transition,KRAS,and myogenesis in DLBCL.CONCLUSION SPARC was highly expressed in DLBCL,and the overexpression of SPARC showed sound diagnostic value.More interestingly,the overexpression of SPARC might be a favorable prognostic biomarker for DLBCL,suggesting that SPARC might be an inducible factor in the development of DLBCL,and inducible SPARC was negative in some oncogenic pathways.All the evidence suggested that inducible SPARC might be a good diagnostic and prognostic biomarker for DLBCL.

Identification of SNARE proteins in fish—Tilapia Oreochromis niloticus

SNARE proteins are a group of membrane-associated proteins involved in exocytosis, secretion and membrane trafficking events in eukaryotic cells. Research on SNARE protein biology has become a more attractive field in recent years, which is applied to marine biology specifically to the fish Tilapia （Oreochromis niloticus）. Plasma membrane fractions of different tissues of Tilapia, including brain, liver-pancreas, intestine, skin and muscle, were extracted, and immuno-decorated with isoform-specific antibodies to the SNARE families and associated proteins. The presence of Syntaxins - 1 A, 2 and 3, SNAP - 23 and SNAP - 25, VAMP - 2, Munc - 18 - 1 and Munc - 13 in the brain was identified, which were differentially distributed in the other organ tissues of the fish Tilapia. The distinct distribution of SNARE and associated proteins will serve as the basis for further investigation into their special secretory function in these tissues of the fish.

Roles of sulfonylurea receptor 1 and multidrug resistance protein 1 in modulating insulin secretion in human insulinoma

BACKGROUND:Sulfonylurea receptor 1(SUR1)and multidrug resistance protein 1(MRP1)are two prominent members of multidrug resistance proteins associated with insulin secretion. The aims of this study were to investigate their expression in insulinomas and their sole and synergistic effects in modulating abnormal insulin secretion. METHODS:Fasting glucose,insulin and C-peptide were measured in 11 insulinoma patients and 11 healthy controls. Prolonged oral glucose tolerance tests were performed in 6 insulinoma patients.Insulin content,SUR1 and MRP1 were detected in 11 insulinoma patients by immunohistochemistry. SUR1 and MRP1 were also detected in 6 insulinoma patients by immunofluorescence. RESULTS:Insulinoma patients presented the typical demons-trations of Whipple’s triad.Fasting glucose of each insulinoma patient was lower than 2.8 mmol/L,and simultaneous insulin and C-peptide were increased in insulinoma patients. Prolonged oral glucose tolerance tests showed that insulin secretion in insulinoma patients were also stimulated by high glucose.Immunohistochemistry and immunofluorescence staining showed that SUR1 increased,but MRP1 decreased in insulinoma compared with the adjacent islets. CONCLUSIONS:The hypersecretion of insulin in insulinomas might be,at least partially,due to the enrichment of SUR1. In contrast,MRP1,which is down-regulated in insulinomas, might reflect a negative feedback in insulin secretion.

Human Seroreactivity to Secreted Molecules of Corynebacterium pseudotuberculosis

Corynebacterium pseudotuberculosis is an infectious agent that occurs in small ruminants causing caseous lymphadenitis, and more rarely in humans causing lymphadenitis and pneumonia. The breeding small ruminants have great economic importance in Brazil. Rural farm workers and veterinary students who acquired this disease suffered from weakening symptoms for weeks, and the identification of the etiological agent was time-consuming and complex. Due to the low prevalence of case records, there is probably no available commercial diagnostic kit for C. pseudotuberculosis infection in humans. This study aimed to describe human seroreactivity to secreted antigens from C. pseudotuberculosis. Reactivity of serum from farm workers (n = 14), individuals who work with the bacillus at laboratory (n = 8) or individuals without contact (n = 25) was tested with secreted proteins from PAT10 strain of C. pseudotuberculosis by Western blotting. Samples of all (100%) farm workers showed reactivity to 31 kDa, 71 kDa and 164 kDa proteins, while laboratory workers showed 87.5%, 62.5 % and 37.5%, and no-contact 20%, 0% and 16%, respectively. All sera recognized the 275 kDa protein. Our data suggest that C. pseudotuberculosis secreted proteins are antigenic in humans and the recognition profiles allowed the identification of individuals with and without prior contact with this bacillus. This is the first paper which describes human reactivity to C. pseudotuberculosis in serum samples of workers in Brazil.

Secretion and expression dynamics of a GFP-tagged mucin-type fusion protein in high cell density Pichia pastoris bioreactor cultivations

The methanol inducible alcohol oxidase 1 promoter and the Saccharomyces cerevisiae alpha-factor prepro secretion signal were used to drive expression and secretion of a mucin-type fusion protein by Pichia pastoris in 1 L scale bioreactors. The aim of the study was to understand how varying expression rates influenced the secretion dynamics of the fusion protein in terms of intracellular- and extracellular concentrations. Endoplasmic reticulum (ER) folding stress was assessed by the relative expression of the unfolded protein response controlled KAR2 gene. Three predefined methanol feeding models were applied to control the fusion protein synthesis rate. To track the fusion protein synthesis in a non-invasive manner and to follow its intracellular distribution, its C-terminal was linked to the green fluorescent protein. Under all conditions the fusion protein was found to partially accumulate intracellularly, where the major fraction was an insoluble, fluorescent full-sized protein. The high degree of glycosylation of the insoluble fusion protein indicated a secretory bottle-neck in the Golgi-system. This result was consistent with low ER folding stress as quantified by the relative expression of the KAR2 gene. Reduction of recombinant protein synthesis rate, by using lower feed rates of methanol, enhanced extracellular concentrations from 8 to 18 mg·L–1 and reduced the rate of intracellular accumulation. This clearly demonstrates the importance of tuning the synthesis rate with secretory bottle-necks to maintain secretion.

创伤性骨关节炎患者血清SOST、SFRP5水平变化及其对预后的预测价值

目的探讨创伤性骨关节炎(PTOA)患者血清骨硬化蛋白(SOST)、分泌型卷曲相关蛋白5(SFRP5)水平变化及其对预后的预测价值。方法选取2020年1月至2022年1月该院收治的84例PTOA患者作为疾病组,另选取同期在该院体检的健康者84例作为健康组。采用酶联免疫吸附试验检测疾病组和健康组血清SOST、SFRP5水平。对疾病组随访1年并采用Lysholm膝关节功能评分评估PTOA患者预后情况。采用Spearman相关性分析法分析PTOA患者血清SOST、SFRP5水平与Lysholm膝关节功能评分的相关性;采用多因素Logistic回归分析PTOA患者预后影响因素;并采用受试者工作特征(ROC)曲线分析血清SOST、SFRP5水平对PTOA患者预后不良的预测价值。结果与健康组比较,疾病组血清SOST、SFRP5水平均明显降低,差异有统计学意义(P<0.05)。Spearman相关性分析结果表明,疾病组血清SOST、SFRP5水平均与Lysholm膝关节功能评分呈正相关。多因素Logistic回归分析结果显示,体重指数>25 kg/m^(2)、入院时凯尔格伦-劳伦斯分级为Ⅲ/Ⅳ级、软骨Outerbridge分级为Ⅲ/Ⅳ级均为PTOA患者预后不良的独立危险因素(P<0.05);术后长期锻炼、SOST、SFRP5水平为保护因素(P<0.05)。ROC曲线分析表明,血清SOST、SFRP5水平联合预测PTOA患者预后不良的ROC曲线下面积(AUC)均高于SOST、SFRP5水平单独预测PTOA患者预后不良的AUC(Z=2.316,P=0.021;Z=2.356,P=0.019)。结论PTOA患者血清SOST、SFRP5水平较健康者降低,二者均与PTOA患者的不良预后相关,对患者预后具有一定的预测效能。

血清TK1、DKK1的表达与晚期非小细胞肺癌患者预后的关系

目的 观察晚期非小细胞肺癌(NSCLC)患者血清胸苷激酶1(TK1)、分泌型蛋白Dikkopf-1(DKK1)水平,并分析血清TK1、DKK1与NSCLC治疗预后的关系。方法 该研究采用前瞻性队列研究方法,纳入2020年1月至2021年6月上海市第六人民医院金山分院收治的91例晚期NSCLC化疗患者为研究对象。所有患者入院时均接受血清TK1、DKK1水平检测,均在上海市第六人民医院金山分院完成4个化疗周期,并随访3个月,参照相关标准评价患者疾病缓解率,将完全缓解、部分缓解纳入预后良好组,将病变稳定、进展纳入预后不良组,比较两组血清TK1、DKK1水平,采用Logistic回归分析血清TK1、DKK1水平与晚期NSCLC患者治疗预后的关系。结果 91例晚期NSCLC化疗患者中,预后良好58例(63.74%);预后不良33例(36.26%);预后不良组血清癌胚抗原(CEA)、TK1、DKK1水平均高于预后良好组(P<0.05);采用Logistic回归分析,血清TK1、DKK1高水平是晚期NSCLC患者治疗预后不良的影响因素(OR>1,P<0.05);绘制受试者工作特征曲线,结果显示,血清TK1、DKK1单独及联合预测晚期NSCLC患者预后不良的曲线下面积均>0.700,均有一定的预测价值,其中联合预测价值最高。结论 血清TK1、DKK1水平异常升高可能提示晚期NSCLC患者预后不良高风险,早期监测患者血清TK1、DKK1水平,对预测、评估患者治疗预后有一定积极意义。

多发性骨髓瘤患者的血清PINP、DKK1和SFRP3水平及其临床意义

目的探讨多发性骨髓瘤(MM)患者的血清I型原胶原氨基端前肽(PINP)、dickkopf Wnt信号通路抑制因子1(DKK1)和分泌型卷曲相关蛋白3(SFRP3)水平及其临床意义。方法纳入150例MM患者(MM组)及150健康体检者(对照组)。比较两组研究对象之间、不同临床分期MM患者之间、不同临床疗效MM患者之间的血清DKK1、PINP、SFRP3水平。采用Logistic回归模型分析治疗前血清DKK1、PINP和SFRP3水平与MM患者临床疗效的关系。采用受试者工作特征(ROC)曲线分析治疗前血清DKK1、PINP和SFRP3水平对MM患者临床疗效的预测效能。结果MM组患者治疗前血清DKK1、PINP和SFRP3水平高于对照组(P<0.05);Ⅰ期、Ⅱ期、Ⅲ期MM患者治疗前血清DKK1、PINP、SFRP3水平依次升高(P<0.05);有效组患者治疗前血清DKK1、PINP、SFRP3水平低于无效组(P<0.05)。治疗前血清DKK1、SFRP3、PINP水平升高是影响MM患者临床疗效的独立危险因素(P<0.05)。治疗前血清DKK1和SFRP3水平对MM患者临床疗效无预测价值(曲线下面积<0.5,P>0.05),而治疗前血清PINP水平对MM患者的临床疗效有一定的预测价值(曲线下面积=0.663,P<0.05)。结论MM患者治疗前的血清DKK1、PINP和SFRP3水平高于健康人群,且与疾病严重程度有关,是MM患者临床疗效的影响因素。治疗前血清PINP水平对预测MM患者的临床疗效有一定的价值。

尿液中蛋白结合毒素水平与上尿路结石的相关性研究

目的·探讨尿液中蛋白结合毒素(protein-bound uremic toxin,PBUT)水平与上尿路结石形成的关系。方法·以海南省儋州市海头镇社区18~80岁居民为研究对象。记录研究对象基本信息和近3 d饮食情况,收集空腹血清和24 h尿液标本,所有对象接受肾脏和输尿管B超检查。将B超检查发现有上尿路结石或有明确上尿路结石病史的对象作为结石组,其他作为非结石组。检测血、尿中结石形成相关的生化指标,通过高效液相色谱检测血、尿中的PBUT(硫酸吲哚酚、3-吲哚乙酸和硫酸对甲酚),以及尿草酸和尿枸橼酸水平。通过多因素Logistic回归分析上尿路结石形成的相关因素。采用Spearman相关性检验分析尿PBUT与尿尿酸、草酸和枸橼酸的相关性。结果·经筛选,共纳入117例研究对象,其中结石组54例,非结石组63例。2组的性别、年龄、血清指标,以及高血压、糖尿病、高尿酸血症/痛风等合并症比例方面差异均无统计学意义。结石组的24 h尿液pH值、钙、尿酸和氯均显著高于非结石组(均P<0.05),而硫酸吲哚酚显著低于非结石组(P<0.05)。多因素Logistic回归分析结果显示,除尿钙外,尿硫酸吲哚酚水平(OR=0.929,95%CI 0.875~0.986,P=0.016)也是上尿路结石形成的独立相关因素。Spearman相关性分析结果显示,24 h尿液中3-吲哚乙酸(r=0.420,P=0.000)和硫酸对甲酚(r=0.307,P=0.001)水平均与草酸呈正相关,硫酸对甲酚水平与尿酸呈正相关(r=0.297,P=0.002),硫酸吲哚酚水平与枸橼酸呈正相关(r=0.289,P=0.002)。结论·在该研究人群中,尿硫酸吲哚酚水平降低可能是上尿路结石形成的独立危险因素,且尿液中PBUT水平与尿酸、草酸、枸橼酸的水平相关。

微小核糖核酸-451a在人参养荣汤治疗鼻咽癌放射性黏膜损伤中的机制研究

目的:通过检测微小核糖核酸-451a(miR-451a)和富含半胱氨酸的分泌性酸性蛋白(SPARC)mRNA的表达,推断人参养荣汤治疗鼻咽癌(NPC)放射性黏膜损伤的疗效及作用机制。方法:选择2022年3月—2023年5月收治的鼻咽癌放射性口腔黏膜损伤患者30例作为观察组,选择同期健康者30例作为对照组。采用辨证论治拟人参养荣汤加减治疗,比较观察组治疗前后患者中医症候积分量表和口干程度、口咽疼痛程度、黏膜损伤程度。检测治疗前后患者血清miR-451a和SPARC mRNA表达水平。结果:人参养荣汤可以有效降低患者主症和次症严重程度、Ⅲ级和Ⅳ级口腔黏膜损伤程度、口咽疼痛程度以及口干程度,使患者血清中miR-451a表达下降,促进SPARC mRNA蛋白翻译增强(P<0.05)。治疗前后,miR-451a与中医症候积分均呈正相关(P<0.05)。结论:人参养荣汤对鼻咽癌放射性黏膜损伤具有一定的临床疗效,可降低miR-451a表达水平,升高SPARC mRNA表达水平;miR-451a抑制了SPARC mRNA的翻译,可为将来的中西医结合治疗提供理论依据。