Correlation between CD4^＋CD25^＋Treg Cells and CCR4 in Nasopharyngeal Carcinoma

OBJECTIVE CD4^＋CD25^＋ T regulatory （Treg） cells are a population of T cells which suppress an overactive immune system. CCR4 is a chemokine receptor involved in the recruitment of lymphocytes. Nasopharyngeal carcinoma （NPC） is resistant to immunosurveillance, owing to the increased number of tumor-infiltrating Treg cells which are recruited to the tumor bv CCR4.

The effect of spleen on the change of Treg cells during mouse pregnancy

Objective:To analyze the effect of spleen on the Treg cells during pregnancy. Methods: The mononuclear cells were separated from the peripheral, spleen and uterus or placenta blood. Flow cytometry was employed to analyze the percent of Treg cells in total T cells in different stages of pregnancy. Immunohistochemical staining was used to make sure the distribution of Treg in spleen in different stages of pregnancy. Results: The results of immunohistochemical staining showed that compared with spleen Treg cells in normal unpregnant mice, spleen Treg cells on day 7 and 14 of pregnancy significantly increased. After splenectomy, peripheral blood and placenta Treg cells on day 7 of pregnancy markedly decreased as compared with the normal pregnancy(P<0.01). And the cells on day 14of pregnancy were markedly recovered as compared with the normal pregnancy. Conclusion: Our study indicated that the spleen and its Treg cells might play important roles in transient tolerance during pregnancy.

Mechanism of Liancao-Xieli capsule in the treatment of ulcerative colitis through the differentiation of Th17 and Treg cells

Objective:To observe the effect of Liancao-Xieli Capsule on STAT signal pathway and T cell differentiation in mouse model of ulcerative colitis;Methods:Forty BALB/c mice were randomly divided into the control group,model group,mesalazine group and Liancao-Xieli capsule group.Except the control group,the other three groups were treated with 3%dextran sodium sulfate free drinking water to construct the model of ulcerative colitis.During the modeling period,each group was given corresponding drugs for intervention,while the control group and the model group were given the same volume of distilled water by gavage as the control.After treatment,HE staining was used to observe the pathological changes of colon tissue,flow cytometry was used to detect the proportion of Th17 and Treg cells in spleen and mesenteric lymph nodes,and ELISA was used to detect TGF-β,IL-6 and IL-17A in colon tissue.Western blot was used to detect the expression levels of related proteins in STAT3/ROR-γt and STAT5/Foxp3 signaling pathways.Results:Compared with the model group,the body weight,colon length and the content of TGF-βin the colon tissue of the mice in the Liancao-Xieli capsule group increased significantly after the experiment,while the DAI score,colon histopathology score,and the contents of IL-6 and IL-17A in the colon tissue were significantly reduced,and the difference was statistically significant(P<0.01).At the same time,Liancao-Xieli capsule can reduce the ratio of Th17 cells and the ratio of Th17/Treg in the spleen and mesenteric lymph node tissues of UC mice,and increase the ratio of Treg cells,and the difference is statistically significant when compared with the model group(P<0.01).In addition,compared with the model group,the expression levels of p-STAT3 and RORγt protein in the colon tissue of the Liancao-Xieli capsule group were significantly reduced,and the expression levels of p-STAT5 and Foxp3 protein were significantly increased after treatment,and the differences are statistically significant(P<0.01),while the expression levels of STAT3 and STAT5 proteins in colon tissue did not change significantly,and the difference was not statistically significant(P>0.05);Conclusion:Liancao-Xieli Capsule can regulate the immune balance of Treg/Th17 and improve the intestinal inflammation of UC.Its mechanism of action is mainly through inhibiting STAT3/ROR-γt and promoting the activation of STAT5/Foxp3 signaling pathway.

Effects of GW5074 in the process of imDCs inducing differentiation of naive CD4^+ T cells into Treg cells in vitro

Objective To establish a stable and efficient method of culturing imDCs in vitro,and to explore the effect of GW5074,which blocks ERK1 /2 signal pathway in the process of immature dentritic cells ( imDCs) on inducing differentiation of the naive allogeneic CD4 + T

Predictive value of Th17 and Treg cells at baseline for HBsAg loss in chronic hepatitis B patients with low HBsAg quantification treated with pegylated interferon and nucleos(t)ide analogue

Background and aims:The primary goal of chronic hepatitis B(CHB)treatment is to reduce hepatitis B surface antigen(HBsAg).T helper 17(Th17)and regulatory T(Treg)cells are essential for the development of CHB.However,how Th17 and Treg cells contribute to HBsAg loss is still unknown.Therefore,this study aimed to search for the predictive value of Th17 and Treg cells for HBsAg loss in CHB patients with low HBsAg quantification.Methods:The study included 99 hepatitis B e antigen(HBeAg)-negative CHB patients who had completed a year of nucleos(t)ide analogue(NA)monotherapy and had received both NA and pegylated interferon(PEG-IFN)treatment for less than 96 weeks(96 wk).In the cured group,48 patients lost HBsAg within 48 wk,while 51 patients did not(uncured group).Blood samples and clinical data were collected for research.Results:During PEG-IFN and NA combination therapy,the proportion of Th17 cells in the cured group increased significantly,while the proportion of Treg cells in the uncured group increased.From 0 to 24 wk,the proportion of Th17 cells in the cured group was significantly higher than in the uncured group,while the opposite was true for Treg cells.Patients with alanine aminotransferase(ALT)2.5 upper limit of normal(ULN)at 12 wk had a higher proportion of Th17 cells and a lower proportion of Treg cells than those with ALT<2.5 ULN at 12 wk.Additionally,the proportion of Th17 cells is inversely associated with the level of HBsAg,whereas the level of Treg cells is positively related to HBsAg quantification.The clinical cure index,including age,HBsAg quantification,and the proportions of Th17 and Treg cells,had a higher area under the curve(0.957)for predicting HBsAg loss when compared to the proportions of Th17 and Treg cells and HBsAg quantification alone.Conclusions:Combined with quantification of HBsAg,the proportions of Th17 cells and Treg cells at baseline can be used as good predictors of HBsAg loss in patients with low HBsAg quantification treated with NA and PEG-IFN.

Huoxue Tongjiang decoction-resisted reflux esophagitis by activation stem cell factor/c-kit/interstitial cell of cajal pathway and regulating the T-helper 17/regulatory T-cells balance in rats

Background:Huoxue Tongjiang decoction(HXTJD)is an effective prescription for treating reflux esophagitis(RE).We investigated the effects of HXTJD on esophageal motility and mucosal inflammation in a rat RE model.Methods:Chemical composition of HXTJD was analyzed by ultrahigh-performance liquid chromatography Q-Orbitrap mass spectrometry(MS).The change rates of mean contraction tension forces,mean amplitudes,and mean frequencies for the lower esophageal sphincter(LES)were recorded using the isolated tissue bath system,mechanical tension transducer,and PowerLab physiological recorder.After weighing the stomach,the phenol red labeling method was used to measure the gastric emptying rate.The LES ultrastructure was observed through transmission electron microscopy.Immunofluorescence and western blotting were used to detect the number of interstitial cells of Cajal(ICC)and the expression levels of c-kit protein,connexin43(Cx43),and stem cell factor(SCF).Flow cytometric analysis and enzyme-linked immunosorbent assay were conducted to detect the percentages of T helper 17(Th17)cells and regulatory T(Treg)cells and the serum concentrations of interleukin 6(IL-6),interleukin 17(IL-17),and interleukin 10(IL-10)in the rats.Results:We identified 28 chemical constituents in HXTJD.Regarding esophageal motility,we revealed that HXTJD increased the mean contraction tension forces,mean amplitudes,and mean frequency change rate of LES and the gastric emptying rate;decreased stomach weight;and improved the LES ultrastructure.Additionally,HXTJD increased the number of ICC-positive cells,and c-kit,Cx43,and SCF expression levels.Regarding esophageal inflammation,HXTJD significantly decreased the percentage of Th17 cells,and IL-6 and IL-17 concentrations,and increased the percentage of Treg cells and IL-10 concentration.Conclusion:HXTJD was found to be efficacious in the rat RE model.It may promote esophageal motility and alleviate the inflammatory response by activating the SCF/c-kit/ICC pathway and regulating the Th17/Treg cell balance.

Increased CD4^+CD45RA^-FoxP3^(low) cells alter the balance between Treg and Th17 cells in colitis mice

AIM To investigate the role of regulatory T cell(Treg) subsets in the balance between Treg and T helper 17(Th17) cells in various tissues from mice with dextran sulfate sodium-induced colitis.METHODS T r e g c e l l s, T r e g c e l l s u b s e t s, T h 1 7 c e l l s, a n d CD4+CD25+FoxP 3+IL-17+ cells from the lamina propria of colon(LPC) and other ulcerative colitis(UC) mouse tissues were evaluated by flow cytometry. Forkhead box protein 3(FoxP 3), interleukin 17A(IL-17A), and RORC m RNA levels were assessed by real-time PCR, while interleukin-10(IL-10) and IL-17 A levels were detected with a Cytometric Beads Array.RESULTS In peripheral blood monocytes(PBMC), mesenteric lymphnode(MLN), lamina propria of jejunum(LPJ) and LPC from UC mice, Treg cell numbers were increased(P < 0.05), and FoxP 3 and IL-10 mR NA levels were decreased. Th17 cell numbers were also increased in PBMC and LPC, as were IL-17 A levels in PBMC, LPJ, and serum. The number of FrI subset cells(CD4+CD45RA+FoxP 3low) was increased in the spleen, MLN, LPJ, and LPC. FrI I subset cells(CD4+CD45RA-Fox P3high) were decreased among PBMC, MLN, LPJ, and LPC, but the number of Fr III cells(CD4+CD45RA-FoxP 3low) and CD4+CD25+FoxP 3+IL-17A+ cells was increased. Fox P3 m RNA levels in CD4+CD45RA-Fox P3 low cells decreased in PBMC, MLN, LPJ, and LPC in UC mice, while IL-17 A and RORC mR NA increased. In UC mice the distribution of Treg, Th17 cells, CD4+CD45RA-FoxP 3high, and CD4+CD45RA-FoxP 3low cells was higher in LPC relative to other tissues.CONCLUSION Increased numbers of CD4+CD45RA-FoxP 3low cells may cause an imbalance between Treg and Th17 cells that is mainly localized to the LPC rather than secondary lymphoid tissues.

Effects of moxibustion on Treg cells in sarcoma microenvironment

Objective:To investigate the therapeutic effect of moxibustion on sarcomas from mesenchymal tissues,which have a low response rate to chemotherapy and radiotherapy.Methods:S180 sarcoma cell line was inoculated in C57 BL/6 mice to form transplanted tumor.Moxibustion therapy was directly applied at the transplanted tumor sites,at a distance of 3.0 cm,10 min per session,till skin temperature reached 45°C,once a day,for 14 consecutive days of intervention.After the mice were killed,serum was collected and used to detect concentrations of interleukin-10(IL-10),transforming growth factor-b1(TGF-b1),IL-4 and interferon-c(IFN-c)by Luminex liquid suspension chip.The numbers of Treg^(^(+) )T cells and CD4^(+) CD25^(+) Forkhead Box P3(Foxp3)^(+) T cells were detected by flow cytometry.Fluorescence in situ hybridization was used to analyze the changes of CD4,CD8,Foxp3 and TGF-b1 in the tumor microenvironment(TME).Results:Weight of S180 transplanted tumor in the control group was(2.03±0.54)g,and that in the moxibustion group was(1.27±0.29)g,which was statistically different(P=0.023).The mean value of Foxp3^(+) T cells in the normal group was 2.01%,which increased to 3.63%after the formation of transplanted tumor,and decreased to 1.48%after moxibustion treatment.The moxibustion group also had reduced numbers of CD4^(+) CD25^(+) Foxp3^(+) T cells in the spleen of mice with transplanted tumor.The concentrations of IL-10,TGF-b1 and IL-4 decreased in the serum of mice with transplanted tumor,while the concentration of IFN-c increased.Moxibustion was associated with downregulation in expression of Foxp3,IL-10 and TGF-b1 genes in the transplanted tumor,and increases in the gene expression of CD4^(+) T cells and CD8^(+) T cells in the TME.Conclusion:Moxibustion may have therapeutic effects on sarcomas by reducing the number of Treg cells in the blood and controlling the infiltration of Treg cells in the TME.

Magnetic cell sorting and flow cytometry sorting methods for the isolation and function analysis of mouse CD^4+ CD25^+ Treg cells

Objective: In this paper we compared the two methods of cell sorting (magnetic cell sorting and flow cytometry sorting) for the isolation and function analysis of mouse CD4+ CD25+ regulatory T (Treg) cells, in order to inform further studies in Treg cell function. Methods: We separately used magnetic cell sorting and flow cytometry sorting to identify CD4+ CD25+ Treg cells. After magnetic cell separation, we further used flow cytometry to analyze the purity of CD4+ CD25+ Treg cells, trypan blue staining to detect cell viability, and propidium iodide (PI) staining to assess the cell viability. We detected the immune inhibition of CD4+ CD25+ Treg cells in the in vitro proliferation experiments. Results: The results showed that compared to flow cytometry sorting, magnetic cell sorting took more time and effort, but fewer live cells were obtained than with flow cytometry sorting. The CD4+ CD25+ Treg cells, however, obtained with both methods have similar immunosuppressive capacities. Conclusion: The result suggests that both methods can be used in isolating CD4+ CD25+ Treg cells, and one can select the best method according to specific needs and availability of the methodologies.

1-MT Enhances Potency of Tumor Cell Lysate-pulsed Dendritic Cells against Pancreatic Adenocarcinoma by Downregulating the Percentage of Tregs

This study examined whether 1-methyl-tryptophan [1-MT,an indoleamine 2,3-dioxygenase(IDO) inhibitor] could reduce CD4+CD25+ regulatory T cells(Tregs) proliferation and improve the anti-tumor efficacy of dendritic cells(DCs) pulsed with tumor cell lysate in the mice bearing pancreatic adenocarcinoma.The models of pancreatic adenocarcinoma were established in C57BL/6 mice by subcutaneous injection of Pan02 cells.Eight mice which were subcutaneously injected with PBS served as control.The expression of IDO was determined in tumor draining lymph nodes(TDLNs) and spleens of the murine pancreatic adenocarcinoma models.The prevalence of Tregs was measured in the TDLNs and spleens before and after 1-MT administration.The dendritic cells were pulsed with tumor cell lysate for preparing DC vaccine.The DC vaccine,as a single agent or in combination with 1-MT,was administered to pancreatic adenocarcinoma mice.The anti-tumor efficacy was determined after different treatments by regular observation of tumor size.The results showed that the levels of IDO mRNA and protein in tumor-bearing mice were significantly higher than those in the normal control mice.The percentage of Tregs in the spleen and TDLNs was also higer in tumor-bearing mice than in normal control mice(P<0.05).Foxp3 expression was significantly lower in the TDLNs and spleens of tumor-bearing mice administrated with 1-MT than that in normal control mice.Furthemore,in the mice that were administered 1-MT plus DC vaccine,the tumor was increased more slowly than in mice treated with DC vaccine or 1-MT alone,or PBS on day 36(P<0.01).Our results indicated that 1-MT may enhance anti-tumor efficacy of dendritic cells pulsed with tumor cell lysate by downregulating the percentage of Tregs.

Detection and Clinical Significance of Th17/Treg Cell-Related Factors in Patients with Gestational Diabetes Mellitus

Objective:To investigate the detection of Th17/Treg cell-related factors in patients with gestational diabetes mellitus(GDM)and its clinical significance.Methods:In this study,a retrospective cohort research method was used to collect the clinical data of 42 patients who were hospitalized in the Affiliated Hospital of Hebei University and received the diagnosis of GDM from January 2018 to December 2022,as well as 42 patients with normal pregnancies during the same period.The Th17/Treg expression levels and metabolism-related indexes in the peripheral blood of patients were detected by radioimmunoassay.Results:The relative expression of Th17 in the serum of patients in the GDM group was significantly higher than that of the control group,and the level of Treg was significantly lower than that of the control group(P<0.05);the levels of FBG,FINS,2hBG,TC,TG and HOMA-IR of the patients in the GDM group were significantly higher than that of the control group,and the level of HOMA-βwas significantly lower than that of the control group(P<0.05).Conclusion:The imbalance of the Th17/Treg cell ratio in patients with GDM may be related to their disease progression and prognosis,providing new ideas and strategies for the clinical treatment of GDM.

Depletion of CD25^+CD4^+T cells (Tregs) enhances the HBV-specific CD8^+ T cell response primed by DNA immunization

AIM: Persistent hepatitis B virus (HBV) infection is characterized by a weak CD8+ T cell response to HBV. Immunotherapeutic strategies that overcome tolerance and boost these suboptimal responses may facilitate viral clearance in chronically infected individuals. Therefore, we examined whether CD25+CD4+ regulatory T (Treg) cells might be involved in a inhibition of CD8+T cell priming or in the modulation of the magnitude of the 'peak' antiviral CD8+ T cell response primed by DNA immunization. METHODS: B10.D2 mice were immunized once with plasmid pCMV-S. Mice received 500 μg of anti-CD25 mAb injected intraperitoneally 3 d before DNA immunization to deplete CD25+ cells. Induction of HBV-specific CD8+ T cells in peripheral blood mononuclear cells (PBMCs) was measured by S28-39 peptide loaded DimerX staining and their function was analyzed by intracellular IFN-γ staining. RESULTS: DNA immunization induced HBV-specific CD8+ T cells. At the peak T cell response (d 10), 7.1±2.0% of CD8+ T cells were HBV-specific after DNA immunization, whereas 12.7±3.2% of CD8+ T cells were HBV-specific in Treg-depleted mice, suggesting that DNA immunization induced more antigen-specific CD8+ T cells in the absence of CD25+ Treg cells (n = 6, P<0.05). Similarly, fewer HBV specific memory T cells were detected in the presence of these cells (1.3±0.4%) in comparison to Treg-depleted mice (2.6±0.9%) on d 30 after DNA immunization (n - 6, P<0.01). Both IFN-γ production and the avidity of the HBV-specific CD8+ T cell response to antigen were higher in HBV-specific CD8+ T cells induced in the absence of Treg cells. CONCLUSION: CD25+ Treg cells suppress priming and/or expansion of antigen-specific CD8+ T cells during DNA immunization and the peak CD8+ T cell response is enhanced by depleting this cell population. Furthermore, Treg cells appear to be involved in the contraction phase of the CD8+ T cell response and may affect the quality of memory T cell pools. The elimination of Treg cells or their inhibition may be important in immunotherapeutic strategies to control HBV infection by inducing virus-specific cytotoxic T lymphocyte responses in chronically infected subjects.

Effect of resveratrol on Treg/Th17 signaling and ulcerative colitis treatment in mice

AIM: To determine the therapeutic efficacy of resveratrol on ulcerative colitis (UC) and its underlying mechanisms. METHODS: The mouse UC model was developed using 5% dextran sulfate sodium. Mice were randomly divided into four groups: normal control, UC model group, resveratrol low-dose group (RLD; 50 mg/kg per day), and resveratrol high-dose group (RHD; 100 mg/kg per day). RESULTS: The results showed that RLD regulates Treg/Th17 balance mainly through reducing the number of Th17 cells, whereas RHD regulates Treg/Th17 balance through both downregulating the number of Th17 cells and upregulating the number of Treg cells. Resveratrol can also regulate the level of plasma and intestinal mucosal cytokines including interleukin (IL)-10, transforming growth factor-beta 1, IL-6, and IL-17. The expressions of hypoxia inducible factor (HIF)-1 alpha, mammalian target of rapamycin (mTOR), and signal transducer and activator of transcription 3 were significantly decreased in the intestinal tissues of mice treated with resveratrol. CONCLUSION: The therapeutic efficacy of resveratrol in UC is dose dependent and closely associated with the regulation of Treg/Th17 balance and the HIF-1 alpha/mTOR signaling pathway.

2’-Fucosyllactose alleviate immune checkpoint blockade-associated colitis by reshaping gut microbiota and activating AHR pathway

Immune checkpoint blockade(ICB)therapeutics are highly effective in cancer immunotherapy,but gastrointestinal toxicity limited the application.Intestinal microbiota plays a crucial role in ICB-associated colitis.2’-Fucosyllactose(2’FL)is most abundance prebiotic in human milk that can reshape gut microbiota and exert immune regulatory effect.The study aimed to determine the effects of 2’FL on ICB-associated colitis and to uncover the mediating mechanism.ICB-associated colitis was induced by the ipilimumab and dextran sulfate sodium.Oral administration of 2’FL(0.6 g/(kg∙day))ameliorated ICB-induced colitis by enhancing regulatory T cells(Treg)and the M2/M1 ratio of macrophages in colon.2’FL treatment also increased the expression of tight junction proteins(zonula occludens-1(ZO-1)and mucin 2(MUC2))and antioxidant stress indicators(superoxide dismutase(SOD)and catalase(CAT)).In addition,administration of 2’FL increased the abundance of Bifidobacterium and Lactobacillus,and elevated the levels of microbial metabolites,such as indole-3-lactic acid(ILA),which activated the aryl hydrocarbon receptor ligands(AHR)pathway.The protective effect of 2’FL was abolished upon depletion of gut microbiota,and ILA treatment partially simulated the protective effect of 2’FL.Notably,2’FL did not exhibit inhibition of antitumor immunity.These findings suggest that 2’FL could serve as a potential protective strategy for ICB-associated colitis by modulating the intestinal microbiota and bacterial metabolites.

YTE-17 inhibits colonic carcinogenesis by resetting antitumor immune response via Wnt5a/JNK mediated metabolic signaling

The density and composition of lymphocytes infiltrating colon tumors serve as predictive factors for the clinical outcome of colon cancer.Our previous studies highlighted the potent anti-cancer properties of the principal compounds found in Garcinia yunnanensis(YTE-17),attributing these effects to the regu-lation of multiple signaling pathways.However,knowledge regarding the mechanism and effect of YTE-17 in the prevention of colorectal cancer is limited.In this study,we conducted isobaric tags for relative and absolute quantification(iTRAQ)analysis on intestinal epithelial cells(IECs)exposed YTE-17,both in vitro and in vivo,revealing a significant inhibition of the Wnt family member 5a(Wnt5a)/c-Jun N-terminal kinase(JNK)signaling pathway.Subsequently,we elucidated the influence and mechanism of YTE-17 on the tumor microenvironment(TME),specifically focusing on macrophage-mediated T helper 17(Th17)cell induction in a colitis-associated cancer(CAC)model with Wnt5a deletion.Additionally,we performed the single-cell RNA sequencing(scRNA-seq)on the colonic tissue from the Wnt5a-deleted CAC model to characterize the composition,lineage,and functional status of immune mesenchymal cells during different stages of colorectal cancer(CRC)progression.Remarkably,our findings demon-strate a significant reduction in M2 macrophage polarization and Th17 cell phenotype upon treatment with YTE-17,leading to the restoration of regulatory T(Treg)/Th17 cell balance in azoxymethane(AOM)/dextran sodium sulfate(DSS)model.Furthermore,we also confirmed that YTE-17 effectively inhibited the glycolysis of Th17 cells in both direct and indirect co-culture systems with M2 macrophages.Notably,our study shed light on potential mechanisms linking the non-canonical Wnt5a/JNK signaling pathway and well-established canonical b-catenin oncogenic pathway in vivo.Specifically,we proposed that Wnt5a/JNK signaling activity in IECs promotes the development of cancer stem cells with b-catenin activity within the TME,involving macrophages and T cells.In summary,our study undergoes the po-tential of YTE-17 as a preventive strategy against CRC development by addressing the imbalance with the immune microenvironment,thereby mitigating the risk of malignancies.

Expression of Helper T Cell Type 17 and CD4^(+)CD25^(+)Tregs in AMA-M2 Positive PBC Patients

Objective:To investigate the expression and impact of helper T cell type 17 and CD4^(+)CD25^(+)regulatory T(Treg)cells in anti-mitochondrial M2 antibody(AMA-M2)positive primary biliary cholangitis(PBC)patients.Methods:Thirty PBC patients with positive AMA(M2 type)(antibody titer above 1:320)by indirect immunofluorescence assay under the Affiliated Hospital of Hebei University from November 2021 to August 2022 were selected as the experimental group,while 30 healthy individuals were selected as controls.The subjects were observed and analyzed for AFP-L3 and immunoglobulin expression.Results:The levels of Th17,Treg,Th17/Treg,interleukin(IL)-17A,IL-2,IL-10,and transforming growth factor(TGF)-β1 cytokines of the experimental group were 2.61±0.48,1.15±0.54,2.41±0.47,310.94±21.14,276.36±36.12,317.89±28.97,and 197.48±31.04,respectively,while those of the control group were 1.14±0.58,0.88±0.29,1.47±0.25,9.69±1.26,57.69±2.45,154.01±19.87,and 514.36±36.12,respectively,wherein P<0.05;the CD4^(+),CD8^(+),and CD4^(+)/CD8^(+)of the experimental group were 39.48±4.19,20.12±4.41,and 1.76±0.14,respectively,while those of the control group were 35.78±4.21,22.01±4.16,and 1.51±0.13,respectively,wherein P<0.05.Conclusion:In patients with PBC,there is a significant imbalance in Th17/Treg cells.Il-17A,IL-2,IL-10,and TGF-β1 cytokines play important roles in the differentiation and functional expression of both Th17 and Treg cells.

Impaired balance of T helper 17/T regulatory cells in carbon tetrachloride-induced liver fibrosis in mice

AIM: To investigate the effect of T helper (Th) 17/T regulatory (Treg) cells on hepatic fibrosis in mice and its possible mechanism.

Analysis of circulating regulatory T cells （CD4 ＋CD25 ＋CD 127-）after cryosurgery in prostate cancer

This study was performed to assess the response of regulatory T cells （Tregs） following cryosurgery in prostate cancer （PCa） patients by measuring their frequency and immune function. Blood was collected prior to and at 4 and 8 weeks after treatment in 30 patients with high-risk PCa who underwent cryosurgery and from 15 healthy volunteers. Circulating CD4＋CD25＋CD127- Tregs were isolated. Their frequency was detected by flow cytometry, and immune suppressive function was evaluated by measuring the proliferation of CD4＋CD25- T cells cocultured with Tregs. The results showed that the percentage of circulating CD4＋CD25＋CD127- Tregs was increased in PCa patients compared to healthy volunteers （7.6%±0.73% vs. 5.8%±0.54%, P〈0.001）. The frequency of circulating CD4＋CD25＋CD127- Tregs was reduced 4 weeks after cryosurgery compared to before surgery （6.3%__.0.58% vs. 7.6%±0.73%, P〈0.001）, and the decrease persisted for 8 weeks. However, the suppressive function of Tregs was increased in eight of 12 patients, which might contribute to cancer recurrence. Then the response of circulating Tregs is complicated after cryosurgery for PCa, and further studies are warranted.

Effect of saikosaponin A on Treg and Th17 immune balance in depressive rats

Objective:To investigate the Effect of saikosaponin A on Treg and Th17 immune balance in depressive rats.Methods:The rat depression model was established with reference to the Katz method,and the rats were randomly divided into control group,model group,western medicine group,and saikosaponin A group.The western medicine group was given 1.2 mg/kg/d of fluoxetine,and the saikosaponin A group was given 25 mg/kg/d of saikosaponin A,while the control group and model group were given the same volume of normal saline.The evaluation of depression in Rats was analyzed by Openfield-test and sugar water preference test.Flow cytometry was used to detect the expression of Th17 and Treg cells.And the expression of IL-17,IL-23,TNF-α,IL-10,TGF-βwere detected by enzyme-linked immunosorbent assay(ELISA).Results:Compared with the control group,the horizontal exercise score,vertical exercise score,and sugar preference of the model group decreased significantly(P<0.05).Compared with the model group,the above indicators were significantly increased in the western medicine group and saikosaponin A group(P<0.05).Flow cytometry showed that compared with the control group,the Th17 cells,Th17/Treg cell ratio in model group increased significantly,whereas the Treg cells decreased significantly(P<0.05).Compared with the model group,The Th17 cells and Th17/Treg ratio in western medicine group and saikosaponin A group decreased,while the Treg cells increased significantly(P<0.05).ELISA showed that compared with control group,the serum levels of IL-17,IL-23 and TNF-αin model group increased,while the levels of IL-10 and TGF-βdecreased(P<0.05).Compared with model group,the levels of IL-17,IL-23 and TNF-αdecreased,while the levels of IL-10 and TGF-βincreased in western medicine group and saikosaponin A group(P<0.05).Conclusion:Saikosaponin A can reduce the degree of depression by regulating the imbalance of Th17/Treg cells and the secretion of inflammatory cytokines in depressed rats.

Advances in the Study on the Relationship between Regulatory T cells and Human Papilloma Viral Infection

Regulatory T cells(Treg cells) are a group of negative regulatory cells that include nonspecific immune regulation CD4+ T cells. Treg cells inhibit the function of other immune cells. CD_4^+ CD_(25)^+ FOXP_3^+ is a Treg cell that is co-expressed by CD_(25) and FOXP_3. The expression of Treg cells is up-regulated in the focal microenvironment and peripheral blood of patients infected with human papilloma virus(HPV). Further studies on Treg cells indicate that their potential clinical applications in the treatment of HPV infection.