Immunotoxicity of N,N-diethylaniline in mice: effect on natural killer activity, cytotoxic T lymphocyte activity, lymphocyte proliferation response and cellular components of the spleen

We previously found that N,N-diethylaniline increased the frequency of sister chromatid exchange (SCE) of human lymphocytes to about five times that of the control value, and was as toxic as cyclophosphamide used as a positive control for SCE. To explore whether N,N-diethylaniline affects the function of lymphocytes, we evaluated its immunotoxicity using CBA/N mice. The mice were divided into four groups and received 0, 100, 200, or 400 mg/kg body weight of N,N-diethylaniline by subcutaneous injection. The following items were investigated on days 3 and 7 after injection: body weight, weight of spleen, number of splenocytes, natural killer (NK) and cytotoxic T lymphocyte (CTL) activities, and concanavalin A (Con A)- and lipopolysaccharide (LPS)-stimulated lymphocyte proliferation using splenocytes. The following splenocyte phenotypes were also quantified by flow cytometry: (1) B cells; (2) total T cells; (3) CD4⁺ and CD8⁺ T cells; (4) NK; (5) macrophages and (6) nucleated erythrocytes. The splenic NK and CTL activities in exposed groups significantly decreased compared to the control in a dose-dependent manner and lymphocytes from the 200 and 400 mg/kg groups showed significantly higher spontaneous proliferation. The weight of the spleen and number of splenocytes were significantly higher in exposed groups than in the control. N,N-Diethylaniline also increased the percentages of macrophages, nucleated erythrocytes and B cells in the spleen. On the other hand, N,N-diethylaniline did not affect LPS-stimulated B cell and Con A-stimulated T cell proliferation, or the percentages of NK, total T, and CD4⁺ and CD8⁺ T cells in the spleen or the body weight of mice. The above findings indicated that N,N-diethylaniline selectively inhibited splenic NK and CTL activity and this inhibition was due to decreased NK and CTL functions, but not due to changes in the numbers of splenic NK and T cells.     

Effects of subchronic inhalation exposure to ethyl tertiary butyl ether on splenocytes in mice

Ethyl tertiary-butyl ether (ETBE) is a motor fuel oxygenate used in reformulated gasoline. The current use of ETBE in gasoline or petrol is modest but increasing. To investigate the effects of ETBE on splenocytes, mice were exposed to 0 (control), 500 ppm, 1750 ppm, or 5000 ppm of ETBE by inhalation for 6 h/day for 5 days/wk over a 6- or 13-week period. Splenocytes were harvested from the control and exposed mice, and the following cell phenotypes were quantified by flow cytometry: (1) B cells (PerCP-Cy5.5-CD45R/B220), (2) T cells (PerCP-Cy5-CD3e), (3) T cell subsets (FITC-CD4 and PE-CD8a), (4) natural killer (NK) cells (PE-NK1.1), and (5) macrophages (FITC-CD11b). Body weight and the weight of the spleen were also examined. ETBE-exposure did not affect the weight of the spleen or body weight, while it transiently increased the number of RBC and the Hb concentration. The numbers of splenic CD3+, CD4+, and CD8+ T cells, the percentage of CD4+ T cells and the CD4+/CD8+ T cell ratio in the ETBE-exposed groups were significantly decreased in a dose-dependent manner. However, ETBE exposure did not affect the numbers of splenic NK cells, B cells, or macrophages or the total number of splenocytes. The above findings indicate that ETBE selectively affects the number of splenic T cells in mice.     

Oxazolone and diclofenac-induced popliteal lymph node assay reactions are attenuated in mice orally pretreated with the respective compound: potential role for the induction of regulatory mechanisms following enteric administration

The murine popliteal lymph node assay (PLNA) was examined as a preclinical assay with the potential to identify low-molecular-weight compounds (LMWCs) that are likely to be associated with immune-mediated drug hypersensitivity reactions (IDHRs) in humans. We hypothesized that the contact sensitizer oxazolone (OX) would cause a strong PLN reaction in naive mice and that the PLN reaction would be attenuated in mice orally pretreated with OX due to the induction of oral tolerance. In naive mice, OX induced a strong PLN reaction and caused dose-dependent increases in PLN size, weight, cellularity, percentage of CD4(+) PLN T cells, and percentage of PLN B cells, with a concomitant decrease in the percentage of CD8(+) PLN T cells. Next, the PLNA was conducted in mice gavaged three times with either OX or vehicle alone (olive oil). Mice pretreated with OX had suppressed PLN reactions following the footpad injection of OX (decrease in PLN size, weight, and cellularity), which was associated with an increase in the percentage of PLN CD8(+)T cells. In contrast, oral pretreatment with OX had no observable effect on the PLN reaction induced following footpad injection of the irrelevant hapten dinitrochlorobenzene (DNCB). Adoptive transfer studies were conducted to examine the mechanism of PLN hyporesponsiveness. It was found that either (1) unfractionated splenocytes or (2) purified CD8(+) splenocytes, but not (3) purified CD4(+) splenocytes isolated from mice gavaged with OX adoptively transferred PLN suppression to naive BALB/c mice. Because OX is not a pharmaceutical, we also examined the NSAID diclofenac (DF) (Voltaren). Like OX, DF caused dose-dependent increases in PLN size, weight, and cellularity in naive mice. Furthermore, like OX, the diclofenac-induced PLN reaction was attenuated in mice that had been orally pretreated three times with DF. However, splenocytes from mice orally treated with DF were not able to adoptively transfer PLN hyporesponsiveness. Collectively, these observations demonstrate that both OX and DF are potent immunostimulators in the PLNA. As importantly, these results demonstrate that the immunostimulating potential of OX and DF in the PLNA is significantly decreased in mice orally exposed to the respective drug, possibly due to the presence of a cellular mechanism of oral tolerance. For OX, the mechanism appears to involve, in part, CD8(+) T cells, whereas the mechanism(s) associated with PLN hyporesponsiveness using DF remain to be defined.     

Safrole-modulated immune response is mediated through enhancing the CD11b surface marker and stimulating the phagocytosis by macrophages in BALB/c mice

Safrole, a component of piper betle inflorescence, is a documented rodent hepatocarcinogen and inhibits bactericidal activity and the release of superoxide anion (O(2-)) by polymorphonuclear leukocytes (PMNs). In the present study, we investigated the effects of safrole on immune responses, including natural killer (NK) cell cytotoxicity, phagocytic activity and population distribution of leukocytes from normal BALB/c mice. The cells population (cell surface markers) and phagocytosis by macrophages and monocytes from the peripheral blood mononuclear cells (PBMCs) were determined, and NK cell cytotoxicity from splenocytes of mice after oral treatment with safrole was performed using flow cytometric assay. Results indicated that safrole did not affect the weights of body, spleen and liver when compared with the normal mice group. Safrole also promoted the levels of CD11b (monocytes) and Mac-3 (macrophages) that might be the reason for promoting the activity of phagocytosis. However, safrole reduced the cell population such as CD3 (T cells) and CD19 (B cells) of safrole-treated normal mice by oral administration. Furthermore, safrole elevated the uptake of Escherichia coli-labelled fluorescein isothiocyanate (FITC) by macrophages from blood and significantly stimulated the NK cell cytotoxicity in normal mice in vivo. In conclusions, alterations of the cell population (the increase in monocytes and macrophages, respectively) in safrole-treated normal BALB/c mice might indirectly influence the immune responses in vivo.     

弓形体重组质粒pcDNA_3-SAG1免疫小鼠诱导的细胞免疫应答研究

目的 :用 pc DNA3- SAG1真核表达质粒直接免疫小鼠 ,观察 DNA免疫所诱导的小鼠细胞免疫应答 ,为研制弓形虫疫苗奠定基础。方法 :大量制备重组质粒 pc DAN3- SAG1,然后将其导入 BAL B/ c小鼠体内 ,每隔 2 1d接种一次 ,一共免疫三次。用 MTT方法对脾脏的 NK细胞和其淋巴细胞的转化率进行测定 ;采用免疫荧光法对 CD4+、CD8+ 细胞进行测定。结果 :实验组 NK细胞杀伤率为 :70 .0± 3.6 4,而 pc DNA3及空白对照分别为 :48.5± 6 .0 8和 47.0± 5 .93。实验组 NK细胞活性比对照组明显增高 (P<0 .0 5 ) ,而 pc DNA3质粒及空白对照组差异无显著性 (P>0 .0 5 ) ;对 T淋巴细胞亚群 CD4+、CD8+进行动态分析 ,可见随着感染时间的延长 ,CD8+的数量逐渐上升 ,CD4+ / CD8+的比率逐渐下降 ,实验组与 pc DNA3质粒及空白对照有明显差异 (P<0 .0 5 ) ;Con A刺激小鼠淋巴细胞转化实验 ,能刺激免疫鼠及对照鼠淋巴细胞增生 ,实验组与 pc DNA3质粒及空白对照组差异无显著性 (P>0 .0 5 )。结论 :重组质粒pc DNA3- SAG1免疫 BAL B/ c小鼠可诱导一定的细胞免疫。     

复方苦参注射液对胃癌术后化疗患者免疫功能的影响

目的：探讨复方苦参注射液对胃癌术后化疗患者的免疫增强作用。方法：将40例胃癌术后化疗患者随机分成两组，对照组给予氟尿嘧啶＋亚叶酸钙＋奥沙利铂化疗，试验组所用化疗方案与对照组相同，同时在化疗的第1～5天给予复方苦参注射液20mL／d。所有患者均用流式细胞仪测定其外周血T淋巴细胞亚群及自然杀伤细胞（NK细胞）数量，并进行对照分析。结呆：对照组化疗后外周血CD3^＋、CD4^＋、NK细胞数量及CD4^＋／CD8^＋细胞比值较化疗前显著下降（P〈0．05），CD8^＋细胞水平显著升高（P〈0．05）；试验组化疗后外周血CD3^＋、CD4^＋、CD8^＋、NK细胞数量及CD4^＋／CD8^＋细胞比值较化疗前无显著差异（P〉0．05）。化疗后试验组外周血CD3^＋、CD4^＋、NK细胞数量及CD4^＋／CD8^＋细胞比值均较对照组显著升高（P〈0．05），CD8^＋细胞水平与对照组无显著差异（P〉0．05）。结论：复方苦参注射液能有效增强胃癌术后化疗患者的免疫功能。     

Modulation of immune response following dietary genistein exposure in F0 and F1 generations of C57BL/6 mice: evidence of thymic regulation.

To further determine whether genistein (GEN) modulation of the immune responses was related to its endocrine-disrupting properties and time of exposure, pregnant C57BL/6 mice were exposed to GEN at 0-1250 ppm in feed starting on day 14 of gestation. The C57BL/6 offspring were exposed to GEN in utero and lactationally, and through feed after weaning until postnatal day 42. In dams, exposure to GEN increased the terminal body weight (250 and 1250 ppm), the number of splenic T cells and NK cells (250 ppm), and the activity of NK cells (250 ppm). In F(1) males, GEN increased the terminal body and spleen weights (25 and 250 ppm), the number of CD4(+)CD8(+) and CD4(-)CD8(+) thymocytes (25 ppm), and the number of splenic T cell subsets and NK cells (25 and 250 ppm). Moreover, splenic NK cell activity and anti-CD3-mediated splenocyte proliferation were increased in all treatment groups. In F(1) females, the percentages of CD4(-)CD8(+) and CD4(-)CD8(-) thymocytes (25 and 250 ppm), and CD4(+)CD8(-) and CD4(+)CD8(+) splenocytes (25 and 250 ppm) were increased. In contrast, the percentage and number of CD4(+)CD8(+) thymocytes were decreased (250 ppm). Exposure to GEN decreased the percentages of splenic NK cells in all treatment groups, and decreased the activity of splenic NK cells at the 25 ppm concentration. Additionally, evaluation of CD25(+) and CD44(+) expression by thymocytes indicated that the decrease in the percentage of CD44(+)CD25(+) thymocytes was at least partially responsible for the decrease in the percentage of CD4(-)CD8(-) thymocytes in F(1) male mice. Overall, the results demonstrate that GEN can modulate the immune system in both adult and developing C57BL/6 mice in a dose-specific manner. The gender-specific effects of GEN on the immune responses in F(1) mice suggest that GEN may modulate the immune system by functioning as either an estrogen agonist or antagonist. The differential effects of GEN on thymocytes in F(1) male and female mice indicate that GEN immunomodulation might be related to its effect on thymus.     

木瓜总苷抑制小鼠接触性超敏反应及对其胸腺T淋巴细胞亚型的调节作用

目的　探讨木瓜总苷对小鼠接触性超敏反应 (CHS)的影响及部分机制。方法　采用了 2 ,4 二硝基氟苯 (DNFB)诱导小鼠CHS模型 ,采用流式细胞术检测小鼠胸腺T淋巴细胞亚型 ,MTT法检测脾脏T淋巴细胞增殖 ,ConA诱导的胸腺T淋巴细胞培养上清中TGF β1和IL 4水平检测采用ELISA法 ,IL 2活性检测采用活化的小鼠脾细胞MTT比色法。结果　于初次致敏前 5d灌胃木瓜总苷 6 0、12 0、2 4 0mg·kg-1和阳性对照药阿克他利 12 0mg·kg-1,连续给药 10d。木瓜总苷 2 4 0mg·kg-1可降低CHS小鼠脾指数和胸腺指数、木瓜总苷 6 0、12 0、2 4 0mg·kg-1均可降低CHS小鼠耳肿胀度、抑制ConA诱导的脾T淋巴细胞过度增殖 ;木瓜总苷 2 4 0mg·kg-1可降低CHS小鼠胸腺异常增高的CD4 + CD8+ 亚型T淋巴细胞比例、恢复降低的CD4 + CD8-亚型T淋巴细胞比例 ;木瓜总苷 6 0、2 4 0mg·kg-1可恢复CHS小鼠低下的CD4 -CD8-亚型T淋巴细胞比例。同时 ,木瓜总苷还可有效抑制ConA诱导的CHS小鼠胸腺T淋巴细胞培养上清液中的TGF β1和IL 2水平 ,并对同一培养上清液中的IL 4水平也有提高作用。结论　木瓜总苷对小鼠CHS有明显抑制作用 ;可有效抑制过度的脾T淋巴细胞增殖 ,调节小鼠胸腺T淋巴细胞亚群和细胞因子产生平衡     

CpG oligodeoxynucleotides with double stem-loops show strong immunostimulatory activity

Based on the current understanding of TLR9 recognition of CpG ODN, we have tried to design a series of CpG ODNs that display double stem-loops when being analyzed for their secondary structures using ‘mfold web server’. Proliferation of human PBMC and bioassay for IFN production were used as technical platforms in primary screening. Interestingly, two of them, designated as DSL01 and D-SL03, belonging to B class CpG ODN and C class CpG ODN respectively, showed vigorous immunostimulatory activity and were chosen for further tests. Flow cytometry analysis showed that both of them could activate human B cells, NK cells, mononuclear cells and T cells and up-regulate expression of CD80, CD86 and HLA-DR on the surface of subsets in human PBMCs. Furthermore, we demonstrated that those two ODNs potently stimulated proliferation of PBMC/splenocytes obtained from diverse vertebrate species. Noticeably, both of them displayed anti-breast cancer effect in mice when administered by peritumoral injection.     

Methamphetamine administration produces immunomodulation in mice

The abuse of methamphetamine (MA) is an increasingly growing problem globally and produces serious side effects. In the present study, the immunomodulating effects of MA were examined on the immune system after MA (5 mg/kg body weight) was administered daily orally for 14 d. The immune system was evaluated by the antibody response to sheep red blood cells (SRBC; plaque assay and serum immunoglobulin [Ig] G), natural killer (NK) activity, lymphocyte subpopulations in the spleen and thymus, and concanavalin A (Con A)- and lipopolysaccharide (LPS)-stimulated lymphocyte proliferation using splenocytes. Body weight, spleen weight, and thymus weight generally decreased in MA-treated mice. MA treatment induced an increase in the percentage of CD4(+) cells with simultaneous decrease in the percentages of CD8(+) and double-positive CD4(+)CD8(+) in thymus. MA inhibited the IgM plaque-forming cell number, and lowered the level of IgG, the proliferation of mitogen-stimulated B and T cells, and the growth of granulocyte-macrophage colony-forming units (CFU-GM). Exposure to MA also decreased interleukin-2 production by splenocytes. In contrast, splenic NK activity in exposed mice was significantly enhanced. Taken together, data indicate that the immune system was suppressed by oral MA exposure.     

Respiratory exposure to diesel exhaust particles decreases the spleen IgM response to a T cell-dependent antigen in female B6C3F1 mice.

We investigated the systemic immunotoxic potential of respiratory exposure to diesel exhaust particles (DEP) in this study. Female B6C3F1 mice (approximately 8 weeks old) were exposed to increasing concentrations of DEP intratracheally, 3 times every two weeks, and sacrificed 2 or 4 weeks after the first exposure. The systemic toxicity and immune status in mice were evaluated. Mice exposed to DEP (1 to 15 mg/kg) showed no significant changes in body, spleen, or liver weights. Lung weights were increased in the mice exposed to 15 mg/kg DEP for 2 or 4 weeks. Except for a decreased platelet count, no significant alterations occurred in hematological parameters following DEP exposure. The number of splenic anti-sheep red blood cell (sRBC) IgM antibody-forming cells (AFC) decreased following DEP exposure for 2 weeks. This effect was less severe following 4 weeks of exposure and was only evident in the high dose group. Exposure to DEP also resulted in a significant decrease in the absolute numbers and the percentages of total spleen cells for total, CD4(+), and CD8(+) T cells, while the numbers of B cells and total nucleated cells in spleen were not significantly changed. The proliferative response of splenocytes to the T-cell mitogen, concanavalin A (ConA), as well as their production of IL-2 and IFN-gamma, was decreased dose-dependently following exposure of mice to DEP for 2 weeks, whereas proliferation was not changed in response to anti-CD3 monoclonal antibody. In summary, short-term respiratory exposure of mice to DEP resulted in systemic immunosuppression with evidence of T cell-mediated and possibly macrophage-mediated mechanisms.     

复方苦参注射液对结直癌术后化疗患者免疫功能的影响

目的：探讨复方苦参注射液对结直癌术后化疗患者免疫功能的保护作用。方法：将80例结直癌术后患者随机分成2组。对照组给予FOLFOX4方案化疗;观察组所用化疗方案与对照组相同,同时加用复方苦参注射液20 mL·d-1治疗,共10 d。采用流式细胞仪测定治疗前后外周血T淋巴细胞亚群和NK细胞活性。结果：对照组化疗后外周血CD3^＋、CD4^＋、NK细胞数量及CD4^＋/CD8^＋细胞比值较化疗前显著下降（P＜0.05）,CD8＋细胞水平显著升高（P＜0.05）;观察组化疗后外周血CD3^＋、CD4^＋、CD8^＋、NK细胞数量及CD4＋/CD8＋细胞比值较化疗前无显著差异（P＞0.05）。化疗后观察组外周血CD3^＋、CD^4＋、NK细胞数量及CD4＋/CD8＋细胞比值均较对照组显著升高（P＜0.05）,CD8＋细胞水平与对照组无显著差异（P＞0.05）。结论：复方苦参注射液能较好地保护结直肠癌术后化疗患者的免疫功能。     

Immune alterations in mice exposed to the herbicide simazine

Simazine, a triazine herbicide, was investigated for its in vivo immunomodulatory properties. Male C57Bl/6 mice were treated with vehicle or 300 or 600 mg/kg body weight (bw) simazine daily orally for 4 wk. The immune system was evaluated by the antibody response to sheep red blood cells (SRBC; plaque assay and serum immunoglobulin G), natural killer (NK) and macro-phage activities, lymphocyte subpopulations in the spleen and thymus, and concanavalin A (Con A)- and lipopolysaccharide (LPS)-stimulated lymphocyte proliferation using splenocytes. Body weight and spleen and thymus weight decreased generally in simazine-treated mice, while the weight of adrenal glands was higher than in the control. Simazine treatment (600 mg/kg) induced an increase in the percentage of CD4(+) cells in spleen and CD8 + in thymus. Simazine inhibited the IgM plaque-forming cell numbers and lowered the level of IgG and the proliferation of mitogen-stimulated B cells and T cells. In addition, splenic NK and peritoneal macrophage activities in exposed mice were significantly decreased. Exposure to simazine also decreased cytokine production by macrophages, such as interleukin-1 (IL-1), IL-6, and tumor necrosis factor-alpha (TNF-alpha). Taken together, data indicate that the immune system was suppressed by oral simazine exposure.     

原因不明习惯性流产患者细胞免疫状态和Th1／Th2细胞因子的变化

目的 探讨原因不明习惯性流产(URSA)患者T细胞、NK细胞亚群和Th1/Th2细胞因子的变化.方法 用流武细胞仪测定65侧URSA患者和30饲正常妊娠妇女外周血CD3 、CD4 、CD8 、CD16 CD56 细胞亚群比例,同时用ELISA法测定两组外周血Th1/Th2细胞因子的含量.结果 与正常妊娠组相比,URSA患者CD4 、CD4 /CD8 、CD16 CD56 百分比较高,而CD8 较低(P相似文献   

3-Methylindole-induced splenotoxicity: functional analysis of immune parameters and lymphocyte phenotyping by flow cytometry.

In this laboratory, 3-methylindole (3-MI), a pneumotoxic metabolite of L-tryptophan that forms in the digestive tract of humans and ruminants, has been demonstrated to be toxic to rat and mouse splenic cells both in vitro and in vivo. The present studies examine whether the reduction in nucleated splenic cells is associated with alterations in: (1) immune functioning (e.g., B and T cell mitogenic responses to lectins), (2) natural resistance (e.g., natural killer (NK) activity and cytokine release from macrophages (MPs)), or (3) the relative percentages of B and T cells in the remaining cells as determined by flow cytometric phenotyping. A dose-dependent decrease in splenic weight (24-46%) and nucleated cell numbers (54-73%) was observed 24 hr after intraperitoneal (ip) administration of 100-300 mg/kg 3-MI to B6C3F1 mice. At a dose of 300 mg/kg, the blastogenic response of splenic lymphocytes to 1 microgram/ml phytohemagglutinin, a T cell mitogen, was reduced 37 and 64%, and NK activity was reduced 20 and 60%, in rats and mice, respectively. Following exposure to 400 mg/kg 3-MI, interleukin-1 and tumor necrosis factor production by lipopolysaccharide-stimulated rat splenic MPs was decreased 58 and 38%, respectively. Despite the reduction in total nucleated cell number in 3-MI-treated mice, the percentages of splenic B and T cells remained the same. These findings indicate that, in addition to its toxicity to splenic cells, 3-MI can significantly impair the functioning of the remaining viable cells. The potential importance of these functional changes for alterations in host resistance in rodents exposed to 3-MI or other alkylindoles is unknown.     

Identification of urinary metabolites of human subjects acutely poisoned by p-chloronitrobenzene.

1. Urinary metabolites from human subjects acutely poisoned with p-chloro-nitrobenzene (p-CNB) were identified by g.l.c.-mass spectrometry. 2. Eight substances, namely, a very large amount of N-acetyl-S-(4-nitrophenyl)-L-cysteine, relatively large quantities of p-chloroaniline, 2-chloro-5-nitrophenol and p-chloroformanilide produced by pyrolysis of a substance originating from p-CNB, small amounts of 2-amino-5-chlorophenol and 2,4-dichloroaniline, and traces of p-chloroacetanilide and 4-chloro-2-hydroxyacetanilide, were detected in urine samples. 3. All of the absorbed p-CNB was metabolized prior to excretion, as the parent compound was not found in urine. 4. N-Acetylated metabolites of p-chloroaniline and 2-amino-5-chlorophenol, resulting from p-CNB by metabolism, were found in only one of eight individuals indicating that this pathway is weak or may be absent in some humans. 5. A scheme for the pattern of metabolic pathways of p-CNB is proposed, and chlorination was considered to be a possible novel metabolic pathway.     

雷帕霉素诱导Balb/c小鼠CD4~+ CD25~+ foxp3~+调节性T细胞增殖

目的探讨雷帕霉素对Balb/c小鼠CD4+ CD25+ foxp3+调节性T细胞的作用。方法取8wk龄的SPF级Balb/c小鼠30只,随机分为两组,实验组每只灌胃雷帕霉素0.4mg.d-1,对照组灌胃每天予等体积无菌水,共3wk。无菌条件下肝素抗凝心脏采血,分离脾脏,制备单细胞悬液。采用流式细胞仪检测小鼠外周血和脾细胞CD4+CD25+T细胞,实时定量PCR检测小鼠脾细胞foxp3 mRNA的表达。结果实验组小鼠外周血和脾细胞中CD4+CD25+T细胞的比例分别为(9.95±4.65)%和(24.13±10.06)%,对照组小鼠外周血和脾细胞中CD4+CD25+T细胞的比例分别为(5.01±1.49)%和(8.48±3.19)%,差异均有显著性(P<0.01)。实验组小鼠脾细胞foxp3 mRNA的表达水平明显高于对照组,是对照组的6.029倍,差异有显著性(P<0.01)。结论雷帕霉素能够明显诱导Balb/c小鼠体内CD4+CD25+T细胞的增殖,并能提高foxp3+ mRNA的表达。     

儿童慢性特发性血小板减少性紫癜T细胞亚群变化研究

目的：探讨儿童慢性特发性血小板减少性紫癜（idiopathicthrombocytopenicpurpura,ITP）T细胞亚群变化的具体情况及临床意义。方法：采用流式细胞仪分别检测30例儿童慢性ITP患者和15例健康儿童（对照组）的外周血CD4＋/CD8＋比值、天然杀伤细胞（naturalkillercell,NK细胞）计数、调节性T细胞（Treg细胞）计数,比较两组之间的差异。结果：慢性ITP组与对照组比较,CD4＋/CD8＋比值,CD16＋CD56＋NK细胞数,CD4＋CD25＋细胞/CD4＋细胞比值均降低,P均〈0.05。结论：CD4＋、CD8＋T细胞亚群改变,NK细胞减少,Treg细胞减少与儿童慢性ITP的发病有关。     

Decreased percentage of NKG2D+NK cells in patients with incident onset of Type 1 Diabetes

Type 1 diabetes mellitus (T1DM) is characterized by absolute insulin deficiency owing to autoimmune destruction of the pancreatic β cells. A significant decrease in natural killer (NK) cells in peripheral blood has been observed in patients with untreated T1DM. In the present study, we aimed to explore the role of NK cells and their subsets in young T1DM patients. A total of 30 children and adolescents with untreated T1DM and 27 healthy controls (HC) were recruited in this study. Flow cytometry analysis indicated that the percentage of peripheral blood CD3‐CD56+ NK cells and NK cells subsets (CD56bright, CD56dim and CD56neg), were significantly decreased in the T1DM patients compared to healthy controls. In addition, the percentage of inducible CD107a+ and IFN‐γ‐secreting NK cells was significantly decreased compared to HC. Interestingly, the percentage of NKG2D+ NK cells negatively correlated with the level of serum TCHOL and TG in T1DM patients. Our data indicate that decreased number and impaired function of NK cells may have a role in the pathogenesis of T1DM.     

570例肺癌患者外周血T淋巴细胞亚群和NK细胞的分析研究

目的探讨不同年龄段肺癌患者T淋巴细胞亚群和NK细胞变化及临床意义。方法回顾分析570例肺癌患者淋巴细胞亚群的流式细胞术检测结果。结果肺癌在51-80年龄段内发病率占78．6％：肺癌患者CD4^＋T细胞相对减低、CD8^＋T细胞相对增高、CD4＋／CD8^＋比值明显降低,与正常对照组比较差异有统计学意义（P〈0．05）;随着肺癌患者年龄降低,NK细胞有明显降低趋势（P〈0．01）,CD3^＋T细胞有明显增加趋势（P〈0．01）。结论肺癌患者CD4^＋T淋巴细胞亚群及NK细胞活性受到抑制,CD4^＋／CD8^＋比值显著降低,细胞免疫功能下降,年龄越年轻其细胞免疫功能越紊乱;流式细胞术检测外周血T淋巴亚群对评价疗效、判断预后具有重要价值。