刚地弓形虫培养上清抑制肺癌A549细胞系增殖

目的研究刚地弓形虫(Toxoplasma gondii)培养上清对体外培养的肺癌细胞A549增殖及细胞周期的影响。方法取对数生长期的A549细胞(浓度为5×104mL-1)分别接种于不同细胞培养板,对照组加入RPMI-1640孵育,试验组加入相同体积不同数量(4×107mL-1、8×107mL-1、16×107mL-1)弓形虫速殖子培养上清孵育不同时间后,四甲基氮噻唑蓝(MTT)法检测吸光度(A490值);PI染色后检测细胞周期;以Western blot检测细胞周期蛋白cyclinB1、cdc2表达或活性。结果弓形虫培养上清呈时间剂量依赖性抑制A549细胞系增殖,处理组细胞周期在G2/M期产生阻滞;A549细胞系的cyclinB1、cdc2蛋白表达量下降。结论刚地弓形虫培养上清能够抑制肺癌A549细胞系增殖,并通过调节cyclinB1、cdc2等蛋白表达或活性改变引起肺癌A549细胞系G2/M期阻滞。     

刚地弓形虫培养上清抑制THP-1细胞株增殖

目的提取弓形虫体外细胞共培养上清,研究上清对人急性单核细胞白血病细胞株THP-1增殖及细胞周期的影响。方法取对数生长期的THP-1细胞(浓度为5×105/mL)分别接种于不同细胞培养瓶,对照组加入含10%胎牛血清RPMI-1640,实验组加入相同体积不同数量(2×107、4×107和8×107/mL)弓形虫速殖子培养上清孵育不同时间后,MTT法检测THP-1细胞增殖率;流式细胞仪检测细胞周期;Western blot检测细胞核转录因子NF-κB/P65与周期蛋白CYCLIND1表达或活性。结果弓形虫培养上清呈时间剂量依赖性抑制THP-1细胞株增殖,使细胞周期在G0/G1期产生阻滞;8×107/mL数量组的THP-1细胞48 h抑制率可达(23.71±0.56)%,G0/M1期细胞比例达(58.53±1.03)%,较对照组比较有明显差异(P<0.05),且处理组THP-1细胞株的NF-κB/P65、cyclin D1蛋白表达量下降。结论刚地弓形虫培养上清能够通过NF-κB信号途径下调cyclin D1蛋白表达引起人急性单核细胞白血病细胞株THP-1 G0/G1期阻滞。     

Toxoplasma gondii infection inhibits the mitochondrial apoptosis through induction of Bcl-2 and HSP70

Heat-shock protein 70 (HSP70) is highly expressed in Toxoplasma gondii-infected cells. However, the role of this protein is not well understood, especially during apoptosis. This study addresses the mechanism behind the antiapoptotic chaperone activity of HSP70 in Toxoplasma-infected host cells using a human macrophage cell line, THP-1 by Western blot, DNA fragmentation assay, immunoprecipitation, and a caspase-3/7 activity assay based on cleavage of the colorimetric substrate DEVD-pNA. Apoptosis induced by arsenic trioxide (As₂O₃) was inhibited in T. gondii-infected THP-1 cells, but not in uninfected cells. Without As₂O₃ induction of apoptosis, T. gondii infection caused increased expression of Bcl-2 and HSP70, but not caspase-3. However, active form caspase-3 levels were lower in As₂O₃-treated infected cells as compared with As₂O₃-treated uninfected cells. Bcl-2 expression in As₂O₃-treated infected cells was similar to that in cells infected with T. gondii. Translocation of apoptosis-inducing factor (AIF) and release of cytochrome c from mitochondria were inhibited in As₂O₃-treated infected cells as compared with As₂O₃-treated uninfected cells. Increased parasite loads in Toxoplasma-infected macrophages caused higher HSP70 and Bcl-2 expression in whole-cell extracts and fractionated components, respectively. However, expression of AIF and cytochrome c was unaffected. Toxoplasma dose-dependently inhibited caspase-3 activation, thus revealing an anti-apoptotic parasite activity on cytochrome c-mediated caspase activation in subcellular components. In addition, immunoprecipitation analysis suggested that HSP70 is capable of binding to the pro-apoptotic factors AIF and Apaf-1, but not to cytochrome c or procaspase-9. Taken together, these data demonstrate that T. gondii infection inhibits mitochondrial apoptosis through overproduction of anti-apoptotic Bcl-2 as well as HSP70, which are increased parasite loads dependently.     

A new soluble antigen preparation of Toxoplasma gondii and its use in serological diagnosis.

A new method of solubilizing Toxoplasma gondii in 5% saponin and 5% octyl glucoside in combination (S-Ag) is described. When analysed by IEP, seven antigens could be detected. Four of these antigens (Ag 1, 2, 3 and 12) were shown by 125I-iodination to be of membrane origin. The remaining three (Ag 4, 5 and 6) were shown to be of intracellular origin and comprise the antigenic profile of more conventional preparations used in serodiagnosis. The S-Ag preparation was tested by ELISA (S-ELISA) in parallel with a freeze-thaw preparation containing only Ag 4, 5 and 6 (FT-ELISA), against the IgG-IFAT. The regression of the FT-ELISA against the IgG-IFAT was poor and there was a high incidence (28.9%) of false negative results. A second order polynomial provided a better fit and this predicted FT negative results on sera with IgG-IFAT titres lower than 1:1024. From this titre upwards, the test was specific but insensitive. The S-ELISA was more specific (5.6% false negatives) and more sensitive; polynomial terms could not provide a better fit. The improvement in the test using the S-Ag is considered to be due to the additional membrane antigens. The possible role of this solubilized antigen in future serodiagnosis is discussed.     

Toxoplasma gondii infection inhibits the development of lupus-like syndrome in autoimmune (New Zealand Black x New Zealand White) F1 mice

Systemic lupus erythematosus (SLE) is an autoimmune disease characterized by the presence of autoantibodies and lupus nephritis. In the present study using New Zealand Black (NZB) x New Zealand White (NZW) F1 (NZBW F1) mice, we planned to investigate the effects of Toxoplasma gondii infection on the progress of lupus nephritis. Female NZBW F1 mice at the age of 2 months were perorally infected with T. gondii. The T. gondii infection reduced the number of mice developing proteinuria and immune complex deposits in their kidneys and prolonged their life span. A marked decrease in the levels of IgM and IgG anti-DNA antibodies, especially IgG2a and IgG3 subclasses, was observed in T. gondii-infected NZBW F1 mice at 9 months of age. The level of anti-HSP70 IgG autoantibody in the sera of NZBW F1 mice was significantly higher than that in control mice at 9 weeks after T. gondii infection. Moreover, NZBW F1 mice treated with anti-self heat shock protein 70 (HSP70) monoclonal antibody were substantially protected against the onset of glomerulonephritis. Further, down-regulation of intracellular expression of IFN-gamma and IL-10 was shown in spleen cells of T. gondii-infected NZBW F1 mice. This was consistent with the previous data indicating the involvement of Th1-type and Th2-type cytokines in the development of lupus-like nephritis. These results suggest that T. gondii infection is capable of preventing the development of autoimmune renal disorder in NZBW F1 mice.     

A protease inhibitor associated with the surface of Toxoplasma gondii

Toxoplasma gondii has a broad host-range including man and a variety of warm-blooded animals. The ability to infect and survive in this wide spectrum of hosts suggests highly evolved mechanisms to handle the harsh environments encountered. Here we show that extracellular tachyzoites are resistant to milligram levels of trypsin and describe the presence of an inhibitor of trypsin associated with the surface of T. gondii, TgTI. TgTI has an estimated molecular mass of 37000 dalton and is encoded by the TgTI-gene which is found at low abundance as an expressed sequence tag (EST) in both the bradyzoite and tachyzoite stages. The inhibitory binding region was found to be in the N-terminus of TgTI where aminoacid-alignment to earlier described protease inhibitors demonstrates 75% similarity. In functional analysis, recombinant TgTI-protein inhibits the activity of trypsin approximately 10 times more efficiently than an inhibitor isolated from soybean. In contrast to other known trypsin inhibitors, TgTI also possesses a predicted membrane-binding region. Polyclonal antibodies raised against recombinant TgTI bind to the surface of the tachyzoite stage as seen both by immunofluorescence and immunoprecipitation of surface labelled parasite proteins. The high survival rate of the parasite in the upper gastrointestinal tract may be enhanced by the presence of the TgTI-molecule.     

Biochemical characterization of mitogen-activated protein (MAP) kinase activity in Toxoplasma gondii

Mitogen-activated protein (MAP) kinase or extracellular signal-regulated kinase (ERK) are activated by many extracellular stimuli. In this study, we investigated whether MAP kinase and tyrosine kinases were involved in transducing signals in Toxoplasma gondii. Using anti-phosphotyrosine and anti-active ERK antibodies, we identified several phosphorylated proteins in Toxoplasma. In particular, phosphorylation of a 47 kDa and a 43 kDa protein increased strongly after calcium influx. MAP kinase activity, caused by calcium influx, was determined using either a specific synthetic peptide, or an in gel kinase assay. Conversely, calcium chelators (BAPTA and EGTA) and a calcium channel blocker (nifedipine) inhibited this activation. Also, a specific inhibitor of MAP kinase kinase (PD 098059) blocked MAP kinase activity. Three specific anti-MAP kinase antibodies recognized the 47 kDa and 43 kDa proteins, which were putatively identified as ERK1- and ERK2-homologs, respectively. These findings provide early evidence of signal transduction involving members of the MAP kinase family in T. gondii. Received: 28 September 1999 / Accepted: 12 October 1999     

吴茱萸碱抑制人骨肉瘤HOS细胞的增殖并促进其凋亡

目的探讨吴茱萸碱对骨肉瘤HOS细胞株增殖凋亡的影响及其可能的机制。方法通过利用0、1、2、4、8μmol/L浓度吴茱萸碱处理HOS细胞24、48 h后,利用CCK-8法检测HOS细胞活性。用3μmol/L的吴茱萸碱处理HOS细0、24、48 h后,利用细胞凋亡-Hoechst染色试剂盒染色观察HOS细胞细胞核染色质的形态。用3μmol/L吴茱萸碱处理0、24、48 h后,利用流式细胞仪检测HOS细胞的凋亡率。3μmol/L吴茱萸碱处理0、24、48 h后,Westernblot检测HOS细胞内Caspase 3、Bcl-2蛋白的表达变化情况。结果 2~8μmol/L的吴茱萸碱可抑制HOS细胞的细胞活性,抑制其增殖,呈剂量-时间依赖性。8μmol/L处理48 h后细胞存活率为0.453±0.071,与对照组比较,差异有统计学意义(P<0.01)。Hoechst-33258染色观察可见凋亡细胞染色质颜色发白,呈固缩状或者碎裂状染色质,染色质着色不均匀,核形态各异。流式细胞仪检测3μmol/L吴茱萸碱处理HOS细胞0、24、48 h后的凋亡率分别为(5.32±1.62)%、(10.85±1.49)%和(12.47±0.59)%,与对照组比较,差异有统计学意义(P<0.01)。吴茱萸碱可上调HOS细胞内的Caspase 3蛋白的表达,同时下调Bcl-2蛋白的表达,与对照组相比较,差异有统计学意义(P<0.05)。结论吴茱萸碱可降低人骨肉瘤HOS细胞的细胞活性,抑制其体外增殖,诱导其发生凋亡,其机制可能与其上调Caspase 3蛋白的表达,下调Bcl-2蛋白的表达有关。     

双硫仑联合铜离子对人骨肉瘤细胞增殖与凋亡的影响

文题释义：双硫仑：是一种广泛用于治疗慢性酒精上瘾以及古柯碱的戒断药物,其为二硫代氨基甲酸盐,水溶性极差。早在20世纪中期,Jacobsen等发现双硫仑可有效抑制乙醛脱氢酶的活性,造成乙醛的饱和氧化反应,其本身和代谢产物可引起体内相关蛋白失活,使人体产生不适反应,从而达到抗酗酒目的。二乙基二硫代氨基甲酸钠(diethyldithiocarbamate,DDTC)：白色至无色片状结晶,有吸湿性,易溶于水,溶于乙醇、甲醇、丙酮,不溶于乙醚和苯。水溶液呈碱性并逐渐分解,遇酸能分离出二硫化碳而使溶液混浊,熔点 94-102 ℃。最大吸收波长(乙醇中)257、290 nm(摩尔吸光系数1 200、13000)。低毒,半数致死量(大鼠,经口)2 830 mg/kg。研究显示,双硫仑在进入人体后会迅速转化为体内代谢物DDTC,Cu可与DDTC结合形成较稳定的DDTC-Cu复合物。背景：研究表明双硫仑本身具有抗肿瘤活性,可联合铜(Cu)离子在体内外水平对多种肿瘤发挥抑癌作用,但关于双硫仑对骨肉瘤细胞增殖和凋亡作用的影响尚未阐明。目的：探讨双硫仑-Cu在体内外水平对骨肉瘤增殖与凋亡能力的影响以及可能的作用机制。方法：实验方案经山西医科大学动物实验伦理委员会批准(批准号为2017LL077)。①体外实验：配置双硫仑在进入人体后的转换物二乙基二硫代氨基甲酸钠(diethyldithiocarbamate,DDTC)和Cu离子的复合物DDTC-Cu(0.5,1,2,3和5 μmol/L),设置DDTC单药(5 μmol/L)、Cu单药(5 μmol/L)和空白对照组。药物处理人骨肉瘤细胞Saos-2细胞和MG-63细胞,CCK8法检测不同浓度DDTC-Cu对Saos-2细胞和MG-63细胞的增殖抑制作用;采用AnnexinV-FITC/PI双染法检测DDTC-Cu对Saos-2细胞凋亡水平变化;②体内实验：取4周龄BALB/c-nu/nu雌性裸鼠共10只,随机分为DDTC-Cu组和对照组。采用异位移植方法,在裸鼠右侧背部皮下注射Saos-2细胞和Matrigel混悬液(1∶1混合),注射量400 μL/只;接种2周后,对照组裸鼠腹腔注射地塞米松(0.5 mg/kg,隔日1次),DDTC-Cu组裸鼠腹腔注射地塞米松(0.5 mg/kg,隔日1次)和DDTC-Cu复合物(10 nmol/g,隔日1次);观察两组荷瘤小鼠移植瘤生长情况,绘制瘤体生长曲线。接种5周后麻醉下处死动物,完整取出瘤体,免疫组织化学检测瘤体石蜡切片组织中ki67蛋白的表达水平,Western blot检测瘤体组织中细胞增殖和凋亡蛋白的表达及JNK通路蛋白表达的变化。结果与结论：①体外实验结果：DDTC-Cu组对骨肉瘤细胞的增殖抑制作用明显高于其他3组;CCK-8实验结果显示DDTC-Cu对骨肉瘤细胞增殖抑制呈剂量依赖性,两株细胞的24 h药物半抑制浓度分别为0.337 μmol/L和0.487μmol/L;流式细胞学检测结果显示DDTC-Cu可呈剂量依赖性促进Saos-2细胞的凋亡;②体内实验结果：DDTC-Cu组裸鼠移植瘤的体积和质量均小于对照组;免疫组织化学结果显示,DDTC-Cu组的瘤体中ki-67蛋白表达水平较对照组降低;Westernblot检测结果显示,DDTC-Cu组瘤体蛋白中p-JNK和c-jun的表达水平均上调。结果提示,双硫仑联合Cu离子在体内外水平抑制人骨肉瘤细胞增殖并促进骨肉瘤细胞凋亡,其作用机制可能与JNK通路活化有关。ORCID: 0000-0003-4818-901X(徐朝健)中国组织工程研究杂志出版内容重点：干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程     

Tissue tropism of Toxoplasma gondii in turkeys (Meleagris gallopavo) after parenteral infection

Turkeys are known to be natural hosts for the zoonotic protozoan parasite Toxoplasma gondii. The objective of the present study was to gain further knowledge of possible predilection sites of T. gondii infection in this species after parenteral application of tachyzoites. A total of 38 turkeys were infected with different doses of T. gondii tachyzoites. Birds were killed either 6 to 8 or 10 to 12 weeks after the experimental infection. Fourteen different tissues per bird were investigated by a nested polymerase chain reaction (PCR) for the presence of the parasites’ DNA. T. gondii DNA was found in any type of tissue analysed; in 86.1 % of all infected birds, at least one sample was tested positive. Over all intravenously infected birds, 15.4 % of all analysed samples contained T. gondii DNA. Most frequently affected tissues were liver (43.3 % positive samples), breast muscle (26.7 % positive samples) and heart (20.0 % positive samples), while the brain was less frequently positive (6.7 %). The number of positive tissues varied from zero to seven tissues per animal with at least one T. gondii-positive edible tissue sample in 80 % of all intravenously infected birds. Still, the results did not indicate defined target tissues or a cyst distribution pattern. Nonetheless, edible organs were most frequently parasitised. The number of positive findings did not differ between the early and the late examination time points. Therefore, a persistence of the tissue stages until the end of the study (12 weeks after infection) is concluded.     

The effect of prolactin (PRL) on the growth of Toxoplasma gondii tachyzoites in vitro

During the development and effector phases of the anti-Toxoplasma response, the immunological system of a host is involved in several complex interactions with the endocrine system, and prolactin (PRL) is one of the most important hormones involved in immunoregulation. In this work, the influence of the recombinant human prolactin (rhPRL) on the viability, penetration, and intensity of intracellular proliferation of Toxoplasma gondii BK strain in vitro was evaluated. Using one murine (L929) and two human cell lines (Hs27 and HeLa), no toxic effect of the rhPRL on host cells was found (by determining cellular viability using MTT assay). A similar lack of rhPRL cytotoxic activity was found in the case of the extracellular tachyzoites of T. gondii BK. Replication of parasites in the presence of rhPRL was analyzed first by simultaneous addition of the hormone and the parasites into a microculture of the host cells (treatment during infection). No statistically significant changes in the intensity of parasite proliferation in all used host cells were found for a wide range of the hormone concentrations. However, pre-incubation of the tachyzoites with rhPRL resulted in a significant reduction (up to 36.15%) in the replication abilities of the parasite. Further experiments revealed that in fact, the inhibition of replication was caused by a limited capacity of the parasites to penetrate host’s cells as demonstrated by the reduced number of infected cells.     

Evaluation of Toxoplasma gondii immunoglobulin G (IgG) and IgM assays incorporating the newVidia analyzer system

The new Vidia system is a fully automated system based on chemiluminescence and antigen bound to magnetic microparticles, which allows a fast measurement of Toxoplasma gondii-specific immunoglobulin G (IgG) and IgM levels. The analytical performances of the Vidia Toxo IgG and IgM assays were compared with those of the automated Vidas, AxSYM, and Liaison Toxo IgG and IgM assays. The comparative evaluation was performed utilizing 204 frozen sera belonging to 166 subjects and 201 fresh sera collected from 198 subjects. For the Vidia Toxo IgG system, the sensitivities were 100% in both the retrospective and prospective studies, and specificities were 98.39% in the retrospective study and 100% in the prospective study, respectively. The sensitivities of the other three Toxo IgG assays were 100%, and the specificities ranged from 96.77% to 100%. For the Vidia Toxo IgM assay, the sensitivity and specificity were 100% in both the retrospective and prospective studies. The overall sensitivities and specificities of the other three Toxo IgM assays ranged from 80% to 100% and from 99.44% to 100%, respectively. In our study, the Vidia system revealed excellent sensitivity (100% for both IgG and IgM assays) and good specificity (99.25% for IgG and 100% for IgM assays).     

Effect of IFN-gamma on the proliferation of Toxoplasma gondii in monocytes and monocyte-derived macrophages from AIDS patients.

This study was undertaken to determine whether the activity of monocytes and monocyte-derived macrophages (MDM) from acquired immune deficiency syndrome (AIDS) patients against Toxoplasma gondii is altered and whether this activity can be modulated by recombinant interferon-gamma (rIFN-gamma). Untreated and rIFN-gamma-treated monocytes or MDM from AIDS patients and from healthy controls were infected with T. gondii and the proliferation of these protozoa was determined. The H2O2 release by monocytes from AIDS patients and healthy controls was measured upon stimulation with phorbol myristate acetate (PMA) and formyl methionyl leucyl phenylalanine (FMLP). Monocytes from AIDS patients exhibited significantly lower toxoplasmastic activity compared to monocytes from healthy controls. The H2O2 release by monocytes from AIDS patients was also diminished. Incubation of monocytes from AIDS patients with rIFN-gamma for 2 days, but not 1 day, restored their toxoplasmastatic activity. The rate of proliferation of T. gondii was higher in MDM from AIDS patients than in MDM from healthy controls. Treatment of MDM from AIDS patients with rIFN-gamma for 1, 2 or 3 days resulted in partial inhibition of the proliferation of T. gondii. Collectively, these results demonstrate that the reduced toxoplasmastatic activity of monocytes and MDM from AIDS patients can be enhanced by in vitro treatment with rIFN-gamma, which supports the clinical use of rIFN-gamma for the treatment of opportunistic infections in these patients.     

Toxoplasma gondii soluble antigen induces a subset of lipopolysaccharide-inducible genes and tyrosine phosphoproteins in peritoneal macrophages.

Previous studies have shown that macrophages play an important role in both the initiation of protective responses and the effector mechanism of immunity to Toxoplasma gondii. The purpose of this investigation was to characterize the responses of macrophages to a soluble antigen extract of T. gondii tachyzoites (STAg) in comparison with a prototypic macrophage-activating agent, lipopolysaccharide (LPS), and to determine whether STAg-induced signaling requires a functional Lps gene. Toward this end, tumor necrosis factor (TNF) secretion, a panel of six LPS-inducible genes, and protein tyrosine phosphorylation were examined to gain insights into macrophage responses to STAg. STAg stimulated both C3H/OuJ (Lpsn) and C3H/HeJ (Lpsd) macrophages to secrete bioactive TNF-alpha and to express a subset of LPS-inducible genes (encoding TNF-alpha, TNF receptor 2, and interleukin-1 beta). In contrast to LPS, STAg failed to stimulate Lpsn or Lpsd macrophages to express genes encoding IP-10, D3, or D8. STAg also induced a pattern of tyrosine phosphorylation identical to that induced by LPS; mitogen-activated protein kinase 47-kDa and 43-kDa isoforms and a 41-kDa protein of undetermined identity were inducibly phosphorylated. The ability of STAg to induce TNF-alpha, encoded by a subset of LPS-inducible genes, and tyrosine phosphoproteins was not affected by LPS inhibitors, confirming that the macrophage response to the parasite extract could not be attributed to LPS contamination. We propose that STAg, while differing from LPS in the pattern of macrophage genes induced, may share with LPS two signaling pathways that are intact in Lpsd macrophages.     

Toxoplasma gondii in Capybara (Hydrochaeris hydrochaeris) antibodies and DNA detected by IFAT and PCR

Toxoplasmosis is considered nowadays as one of the most important foodborne diseases in the world. One of the emerging risks in acquiring infection with Toxoplasma gondii is the increasing popularity of wild animals and game meat. Capybara (Hydrochaeris hydrochaeris) is the world’s largest extant rodent and is used for human consumption in many areas of South America, and in case it carries T. gondii cysts, it may act as a source of infection. In the present study, we detected infection with T. gondii in capybaras from the south of Brazil. Antibodies to T. gondii were assayed in the serum of capybaras using the indirect fluorescent antibody test (IFAT ≥ 1:16). Blood, liver, heart, lymph nodes, and spleen tissues were collected and tested by polymerase chain reaction (PCR) for B1 gene and ITS1 region. The results showed that 61.5% (16/26) capybaras were seropositive to T. gondii. Titers of specific antibodies to T. gondii ranged from 1:16 to 1:512. Among the feral rodents studied, 7.7% (2/26) were PCR positive for B1 gene assay and 11.5% (3/26) were positive for ITS1 PCR assay; for both test, the prevalence was 15.4%. Liver, heart, and blood tissues were those which tested positive for the apicomplexan. Our findings show a high percentage of infection with T. gondii in asymptomatic capybaras. Based on those data, we hypothesize that the consumption of raw or undercooked capybara meat could be a source of infection for humans.     

rhIL-16对Tax 1蛋白阳性细胞增殖抑制和凋亡的影响

目的探讨rhIL-16对Tax 1蛋白阳性细胞增殖抑制和凋亡的影响。方法将pCMV-Tax1-Bam质粒稳定转染到Jurkat E6-1细胞后,构建Tax 1基因表达细胞系Tax 1P,用IL-16腺病毒载体转染Tax 1P细胞后,不同时间收获细胞,通过MTT、流式细胞术测定线粒体膜电位等方法,证实Tax 1P细胞增殖抑制和凋亡。结果用MTT法计算细胞生长抑制率,观察到IL-16腺病毒载体转染的Tax 1P细胞增殖受到明显抑制;DNA片段分析在转染6 h后出现凋亡片段;进一步用流式细胞仪检测细胞周期停滞于G1期,IL-16对细胞线粒体膜电位的影响24 h内逐渐增强,预示细胞凋亡。结论重组人IL-16腺病毒载体转染Tax 1P细胞,24 h内即可诱导Tax 1P细胞发生细胞增殖抑制并且出现凋亡,为成人T淋巴细胞白血病防治提出了新思路。