Given its population of CCR5-expressing, immunologically activated CD4 +T cells, the gastrointestinal (GI) mucosa is uniquely susceptible to human immunodeficiency virus (HIV)-1 infection. Recent studies have shown that, as in macaques infected with simian immunodeficiency virus (SIV), intestinal CD4 +T cells are selectively and rapidly depleted in the intestine of HIV-infected patients. Depletion of intestinal CD4 +T cells occurred at all stages of infection regardless of highly active antiretroviral therapy (HAART). Here we discuss the important implications of the recent findings for our understanding of HIV pathogenesis, treatment, and vaccine design. The major significance is that it supports a simple hypothesis to explain the pathogenesis of HIV infection, that most HIV replication occurs in the intestine and that disease progression may correlate with turnover of specific cell subsets in mucosal tissues.

AIM: To explore the correlation between development of CD4~+CD25~+ regulatory T cells (CD4~+CD25~+ Tr) and thymus CD4~-CD25~+ cells. METHODS: The ratios of CD4~+CD25~+ regulatory T cells to CD4~+ T cells in thymus, spleen, lymph node and peripheral blood of mice from birth to mature and also the ratios of CD4~-CD25~+cells to CD4~-T cells in thymus were measured by flow cytometry. Purified CD4~+CD25~+ T cells and CD4~+CD25~- T cells were labeled with CFDA-SE, and then stimulated with various kinds of stimulators. RESULTS: The percentages of CD4~+CD25~+ Tr in mouse spleen, lymph nodes and peripheral blood increased gradually, but not in thymus, from day one to week 10 of the age with rapid rising from day one to week 1. The percentages of CD4~-CD25~+ cells in mouse thymus were quite high on day one after birth, and decreased rapidly from day one to week 1. Both CD4~+CD25~+ Tr and CD4~+CD25~- T cells showed no proliferation in response to ConA, while CD4~+CD25~+ Tr showed a transient enlargement of cell size. Both CD4~+CD25~+ Tr and CD4~+CD25~- T cells underwent proliferation in response to PDB plus ionomycin. CD4~+CD25~- T cells, but not CD4~+CD25~+ Tr, showed a proliferative response to the stimulation of coated anti-CD3 plus soluble anti-CD28 antibody, however, CD4~+CD25~+ Tr showed significant proliferation and CD4~+CD25~- T cells showed a stronger response in addition of high dose of IL-2. CONCLUSION: The thymus CD4~-CD25~+ cells are probably the precursor of CD4~+CD25~+ Tr during cell development.

Objective:To study the effect of isoflavone and genistein on activation of T lymphocytes in order to develope new immuno intervention reagent.Methods:Fluorescence conjugated monoclonal antibodies and flow cytometer were used to detect the expression rate of CD69 by activated T cells in vitro in response to Phytohemagglutinin(PHA) and Phorbol 12,13 dibutyrate(PDB),with some samples pre incubated with 10,50 or 100 ?mol/L of genistein,after 2 h and 6 h of incubation in whole blood culture system.Results:After 2 h of culture,the inhibitory effect in PHA group was stronger than PDB group(P

Objective To investigate the association between the C609T polymorphism of NAD (P)H:quinoneoxidoreductase (NQO1) gene and post operative cognitive dysfunction (POCD).Methods 90 ASA Ⅰ-Ⅱ patients of 59 to 78 years old, undergoing elective hip replacement with epidural anesthesia were enrolled.All patients were given a battery of 5 neuropsychological tests before operation and seven days after operation.Patients were divided into POCD group and control group according to test results (45 patients in each group).The single nucleotide polymorphism C609T of NQO1 gene was detected using real-time PCR by Taqman probes and subjected to odd ratio assessment.Results 5 samples in control group couldn' t be used in the real-time PCR analysis due to quality control.The frequency of C/C genotype in POCD control was lower than that of control group ( 30.0% vs 11.1% ) with statistical significance ( OR = 0.292,95 % CI 0.092 ～ 0.92 1, P ＜ 0.05 ).The C/T +T/T genotype frequency was significantly higher in group POCD than in the control group(88.8% vs 70% ).Patients presented with C/T + T/T genotype showed an evidently increased risk of POCD ( OR =3.42,95% CI 1.08 ～ 10.82,P ＜ 0.05 ).The frequency of C allele of NQO1 gene in group control was 56.2%, as compared with 40% in group POCD with significance ( OR = 0.519,95% CI 0.282 ～ 0.955, P ＜ 0.05 ).The frequency of T allele of NQOI gene in control group was 43.7% ,as compared with 60.0% in POCD group( OR = 1.93,95% CI 1.047 ～3.552,P＜O.05).Conclusion The NQO1 gene single nucleotide polymorphism C609T is evidently associated with the increased risk of POCD.

AIM:To study the effects of progesterone(P4) on the maturation and immunologic function of dendritic cells(DCs) from human peripheral blood.METHODS:Cultured DCs were treated with P4 at doses of 10-7 mol/L and 10-6 mol/L.The morphologic changes were observed under the scanning electronic microscope.The immunophenotypes of DCs in control and treated groups were analyzed by flow cytometry.IL-10 and IL-12 production in culture supernatant was examined by ELISA assay.The capability of the stimulatory activity of the DCs on allogeneic T cells in mixed reaction was tested by incorporation of [3H]-TdR.RESULTS:Compared with control group,cultured DCs in the presence of P4 displayed less dendritic pseudopod,expressed low levels of MHC-II,CD40,CD80 and CD86,and exhibited weakly activity in stimulating the proliferation of allogeneic T cells.Increase in IL-10 production and decrease in IL-12 production were observed.CONCLUSION:P4 exerts negative effect on the maturation and immunologic function in dendritic cells from human peripheral blood.

AIM:To study the roles of bone marrow-derived dendritic cells from donor mouse treated with 17?-estradiol(E2)in immune tolerance induction in skin allograft.METHODS:Bone marrow-derived dendritic cells from C57 mouse as donor were cultured respectively treated with E2(E2 group).BALB/c mouse as recipient received respectively one injection of dendritic cells of E2 group,mature dendritic cell group and immature dendritic cell group intravenously.Skin transplantation was performed in the absence of immunosupression after 7 d.Mice that received PBS were served as control.The time of skin survival was observed after transplantation.Flow cytometry was used to analyze the percentage of CD4+CD25+ T cells in peripheral blood respectively before and after transplantation.RESULTS:Compared with immature dendritic cells and control group,the time of skin survival in E2 group was significantly longer(P

Aim To investigate the effects of paclitaxel(PTX) on the expression of CD69, CD25 and proliferation of T cells by polyclonal stimulas in vitro, and explore the molecular mechanism of paclitaxel. Methods Fluorescence conjugated monoclonal antibodies and flow cytometry were used to detect the express of CD69 and CD25 by activated T cells in vitro in response to Concanavalin(Con A) and Phorbol 12,13-dibutyrate(PDB) or T cell proliferation index stained by CFDA-SE in response to PDB+Ion or Con A. Results Paclitaxel had no effect on the expression of CD69, but inhibited the expression of CD25 in activated T cells in response to Con A or PDB in a concentration-dependent manner. Paclitaxel caused a dose-dependent suppression of T cell proliferation to Con A as well as to PDB+Ion. Whether added at the beginning or after 24 h of stimulation by Con A or PDB+Ion, paclitaxel had identical effects. Conclusion The mid and later activation and proliferation of murine T cells stimulated by Con A or PDB+Ion were significantly inhibited by paclitaxel, suggesting that paclitaxel acts on the downstream signaling pathways of PKC?,and not act on the intitial activated associated proteins such as PTK and PKC?.

Objective To investigate the effects of siRNA targeting decoy receptor 3 on the cell proliferation of ovarian carcinoma cell CAOV3. Methods We constructed siRNA targeting decoy receptor 3,which was transfected into ovarian carcinoma cells CAOV3 , and observed the effects of DcR3 siRNA on the cell proliferation of CAOV3 cell by MTT experiment. The experiment contained 3 groups, including the normal control group (CAOV3 cell was not transfected), the negative control group (CAOV3 cell was transfected with blank vector) and the experimental group (CAOV3 cell was transfected with DcR3 siRNA). The expression levels of DcR3 mRNA were detected by Real-time PCR. Results DcR3 siRNA recognized and degraded DcR3 mRNA in CAOV3 cells of the experimental group. DcR3 mRNA of the experimental group was significantly decreased. The proliferation of CAOV3 cell was significantly decreased by DcR3 siRNA comparing with the normal control group and negative control group (P < 0.01). Conclusion DcR3 siRNA can inhibit the proliferation of ovarian cancer cell line CAOV3 by recognized and degraded DcR3 mRNA.

AIM:To study the changes of mitochondria during apoptosis in Jurkat cells induced by arsenic oxide(As2O3).METHODS:By treated with 4?10-6 mol/L As2O3,apoptosis and necrosis of Jurkat cells were assessed by annexin V-FITC/PI double staining flowcytometry.Mitochondrial mass and its membrane potential(△?m)was measured by NAO/PI and DiOC6(3)/PI staining,respectively.Free radical formation was detected by DCFDA staining.RESULTS:After 48 h of As2O3 treatment,the rates of early apoptotic Jurkat cells in As2O3 and control groups were(18.98?1.40)% and(5.17?0.80)%,respectively(P

AIM: To study the effect of genistein on activation and proliferation of T cells,and explore the molecular mechanism of genistein. METHODS: Fluorescence conjugated monoclonal antibodies and flow cytometry were used to detect the express of CD69 and CD25 by activated T cells in vitro in response to Concanavalin (ConA )and Phorbol 12,13-dibutyrate(PDB) or T cell proliferation stained by CFSE in response to PDB / Ionomycin or ConA. RESULTS: Genistein inhibited the expression of CD69 and CD25 in activated T cells in response to Con A in a concentration-dependent manner and in response to PDB in a high concentration. Genistein inhibited proliferation of T cells in both groups in a concentration-dependent manner. CONCLUSION: Genistein inhibited activation and proliferation of T cells in vitro in response to polyclonal stimulus,and it may hold potential as a new immunosuppressant.