Objective: To study the enhancement of the immune functions and autologous tumor killing (ATK) activity by kappa selenocarrageenan (KSC) in mice bearing sarcoma 180. Methods: To measure the effects of KSC and/or Cy...Objective: To study the enhancement of the immune functions and autologous tumor killing (ATK) activity by kappa selenocarrageenan (KSC) in mice bearing sarcoma 180. Methods: To measure the effects of KSC and/or Cyclophosphamide (Cy) on natural killer (NK) activity, lymphokine activated killer (LAK) activity, the produc tion of interleukin 2 (IL 2), ATK activity and the growth of sarcoma 180 (S 180 ). Results: KSC promoted NK activity, LAK activity and ATK activity in vivo , increased IL 2 production at 40 mg/kg/d×9d. It also enhanced the antitumor action of Cy (20 mg/kg/d×9d) and offset the inhibition of Cy on immunocopetent cells. The ATK activity in splenocytes of S 180 bearing mice could be induced and increased by recombinant interleukin 2 (rIL 2) in vitro . Conclusion: KSC has an up regulating effect on the immune functions and ATK activity in tumor bearing mice. It can be used as a biological response modifier (BRM) in cancer biotherapy.展开更多
Background： Regulatory T-cells （Treg） play key roles in suppressing cell-mediated immunity in cancer patients. Little is known about perioperative Treg fluctuations in nonsmall cell lung cancer （NSCLC）. Video-ass...Background： Regulatory T-cells （Treg） play key roles in suppressing cell-mediated immunity in cancer patients. Little is known about perioperative Treg fluctuations in nonsmall cell lung cancer （NSCLC）. Video-assisted thoracoscopic （VATS） lobectomy, as a minimal invasive procedure for treating NSCLC, may have relatively less impact on the patient＇s immune system. This study aimed to observe perioperative dynamics of circulating Treg and natural killer （NK） cell levels in NSCLC patients who underwent major Iobectomy by VATS or thoracotomy. Methods： Totally, 98 consecutive patients with stage I NSCLC were recruited and assigned into VATS or thoracotomy groups. Peripheral blood samples were taken on 1-day prior to operation, postoperative days （PODs） I, 3, 7, 30, and 90. Circulating Treg and NK cell counts were assayed by flow cytometry, defined as CD4＋CD25＋CD127w cells in CD4＋ lymphocytes and CD56＋I6＋CD3 cells within CD45＋ leukocytes respectively. With SPSS software version 21.0 （SPSS Inc., USA）, differences between VATS and thoracotomy groups were determined by one-way analysis of variance （ANOVA）, and differences between preoperative baseline and PODs in each group were evaluated by one-way ANOVA Dunnett t-test. Results： In both groups, postoperative Treg percentages were lower than preoperative status. No statistical difference was found between VATS and thoracotomy groups on PODs 1, 3, 7, and 30. On POD 90, Treg percentage in VATS group was significantly lower than in thoracotomy group （5.26 ± 2.75 vs. 6.99 ±3.60, P = 0.012）. However, a higher level of NK was found on all PODs except on POD 90 in VATS group, comparing to thoracotomy group. Conclusions： Lower Treg level on POD 90 and higher NK levels on PODs 1, 3, 7, 30 in VATS group might imply better preserved cell-mediated immune function in NSCLC patients, than those in thoracotomy group.展开更多
目的:观察肺气虚证患者和肺阴虚证患者外周血自然杀伤细胞(NK 细胞)表达状况。方法:应用流式细胞仪分别对58例肺气虚证患者、12例肺阴虚证患者和20例健康查体者 CD_(16)/CD_(56)进行测定。结果:肺气虚证患者和肺阴虚证患者 NK 细胞活性...目的:观察肺气虚证患者和肺阴虚证患者外周血自然杀伤细胞(NK 细胞)表达状况。方法:应用流式细胞仪分别对58例肺气虚证患者、12例肺阴虚证患者和20例健康查体者 CD_(16)/CD_(56)进行测定。结果:肺气虚证患者和肺阴虚证患者 NK 细胞活性下降;肺气虚证各组间 NK 细胞活性也存在明显的差异。结论:肺气虚证患者免疫功能由早期的活跃状态逐步发展到不同程度的免疫抑制,然后发展至肺阴虚证,最终导致免疫系统内环境稳定失调。展开更多
自然杀伤(natural killer,NK)细胞在机体抗肿瘤免疫、抗感染免疫和生殖免疫中均发挥着重要的作用,对其信号通路的研究有助于更好地理解NK细胞的生物学行为。信号传导及转录激活因子(signal transducers and activators of transcription...自然杀伤(natural killer,NK)细胞在机体抗肿瘤免疫、抗感染免疫和生殖免疫中均发挥着重要的作用,对其信号通路的研究有助于更好地理解NK细胞的生物学行为。信号传导及转录激活因子(signal transducers and activators of transcription,STAT)信号通路在NK细胞的生长发育和功能调控中发挥着重要的作用,是近年来研究较多的通路。激活NK细胞内的STAT1、STAT4、STAT5可以促进NK细胞的活性,有利于NK细胞行使其抗感染、抗肿瘤的作用。抑制NK细胞内的STAT3、STAT6亦可增强NK细胞的细胞毒性,但有些情况下会起到相反的作用。作者通过对近几年关于STAT信号通路在NK细胞中研究的调研,旨在促进NK细胞在转化医学中的研究和应用。展开更多
OBJECTIVE: To investigate the effects of anti-HPV16E6-ribozyme (HRz) on phenotype and gene expression of a cervical cancer cell line. METHODS: HRz was designed by computer programs. HRz's activity was identified b...OBJECTIVE: To investigate the effects of anti-HPV16E6-ribozyme (HRz) on phenotype and gene expression of a cervical cancer cell line. METHODS: HRz was designed by computer programs. HRz's activity was identified by cleavage experiments in vitro. HRz and empty eukaryotic plasmids were transfected into CaSKi cells with lipofectin, then renamed CaSKi-R and CaSKi-P, respectively. The expression of ribozyme in transfected cells was observed by RNA dot blot. The amounts of E6 mRNA in three kinds of cells lines were detected by Northern blot. Cell growth curves and soft agar forming ability were studied. The ability of each cell line to form tumors was assessed in nude mice. Apoptosis rates and expression of c-myc, bcl-2, p53 and Fas were detected by flow cytometry (FCM). Antigens of tumor cells, HLA-1, HLA-2, B7-1 and B7-2 were also detected. NK, LAK, and CD(3)AK cells were induced. Their cytotoxicities were detected in CaSKi-R, CaSKi-P, and CaSKi cells. RESULTS: In vitro cleavage reaction demonstrated that HRz could cleave HPV16E6 mRNA in a site-specific manner. HRz could be expressed stably in transfected CaSKi cells. Northern blot analysis showed that E6 mRNA levels were lower in CaSKi-R than in CaSKi. The growth rate of CaSKi-R was slower than those of CaSKi and CaSKi-P. The soft agar-forming rate of CaSKi-R was lower compared with those of CaSKi and CaSKi-P cells. The ability of CaSKi-R to form tumors in nude mice was also poor. The apoptosis rate of CaSKi-R cells was much higher than those of CaSKi and CaSKi-P. HRz could reduce the expression of E6, c-myc and bcl-2 proteins, and increase the expression of p53 as well. HRz could increase the expression of HLA-2, B7-1 and B7-2 antigens. The cytotoxicity of NK, LAK and CD(3)AK cells was much higher in CaSKi-R than in CaSKi-P and CaSKi cells. CONCLUSION: HRz not only reverses the malignant phenotype of CaSKi cells partially, but also induces apoptosis in the cells, and increases sensitivity of CaSKi cells to immune cells.展开更多
文摘Objective: To study the enhancement of the immune functions and autologous tumor killing (ATK) activity by kappa selenocarrageenan (KSC) in mice bearing sarcoma 180. Methods: To measure the effects of KSC and/or Cyclophosphamide (Cy) on natural killer (NK) activity, lymphokine activated killer (LAK) activity, the produc tion of interleukin 2 (IL 2), ATK activity and the growth of sarcoma 180 (S 180 ). Results: KSC promoted NK activity, LAK activity and ATK activity in vivo , increased IL 2 production at 40 mg/kg/d×9d. It also enhanced the antitumor action of Cy (20 mg/kg/d×9d) and offset the inhibition of Cy on immunocopetent cells. The ATK activity in splenocytes of S 180 bearing mice could be induced and increased by recombinant interleukin 2 (rIL 2) in vitro . Conclusion: KSC has an up regulating effect on the immune functions and ATK activity in tumor bearing mice. It can be used as a biological response modifier (BRM) in cancer biotherapy.
文摘Background： Regulatory T-cells （Treg） play key roles in suppressing cell-mediated immunity in cancer patients. Little is known about perioperative Treg fluctuations in nonsmall cell lung cancer （NSCLC）. Video-assisted thoracoscopic （VATS） lobectomy, as a minimal invasive procedure for treating NSCLC, may have relatively less impact on the patient＇s immune system. This study aimed to observe perioperative dynamics of circulating Treg and natural killer （NK） cell levels in NSCLC patients who underwent major Iobectomy by VATS or thoracotomy. Methods： Totally, 98 consecutive patients with stage I NSCLC were recruited and assigned into VATS or thoracotomy groups. Peripheral blood samples were taken on 1-day prior to operation, postoperative days （PODs） I, 3, 7, 30, and 90. Circulating Treg and NK cell counts were assayed by flow cytometry, defined as CD4＋CD25＋CD127w cells in CD4＋ lymphocytes and CD56＋I6＋CD3 cells within CD45＋ leukocytes respectively. With SPSS software version 21.0 （SPSS Inc., USA）, differences between VATS and thoracotomy groups were determined by one-way analysis of variance （ANOVA）, and differences between preoperative baseline and PODs in each group were evaluated by one-way ANOVA Dunnett t-test. Results： In both groups, postoperative Treg percentages were lower than preoperative status. No statistical difference was found between VATS and thoracotomy groups on PODs 1, 3, 7, and 30. On POD 90, Treg percentage in VATS group was significantly lower than in thoracotomy group （5.26 ± 2.75 vs. 6.99 ±3.60, P = 0.012）. However, a higher level of NK was found on all PODs except on POD 90 in VATS group, comparing to thoracotomy group. Conclusions： Lower Treg level on POD 90 and higher NK levels on PODs 1, 3, 7, 30 in VATS group might imply better preserved cell-mediated immune function in NSCLC patients, than those in thoracotomy group.
文摘目的:观察肺气虚证患者和肺阴虚证患者外周血自然杀伤细胞(NK 细胞)表达状况。方法:应用流式细胞仪分别对58例肺气虚证患者、12例肺阴虚证患者和20例健康查体者 CD_(16)/CD_(56)进行测定。结果:肺气虚证患者和肺阴虚证患者 NK 细胞活性下降;肺气虚证各组间 NK 细胞活性也存在明显的差异。结论:肺气虚证患者免疫功能由早期的活跃状态逐步发展到不同程度的免疫抑制,然后发展至肺阴虚证,最终导致免疫系统内环境稳定失调。
文摘自然杀伤(natural killer,NK)细胞在机体抗肿瘤免疫、抗感染免疫和生殖免疫中均发挥着重要的作用,对其信号通路的研究有助于更好地理解NK细胞的生物学行为。信号传导及转录激活因子(signal transducers and activators of transcription,STAT)信号通路在NK细胞的生长发育和功能调控中发挥着重要的作用,是近年来研究较多的通路。激活NK细胞内的STAT1、STAT4、STAT5可以促进NK细胞的活性,有利于NK细胞行使其抗感染、抗肿瘤的作用。抑制NK细胞内的STAT3、STAT6亦可增强NK细胞的细胞毒性,但有些情况下会起到相反的作用。作者通过对近几年关于STAT信号通路在NK细胞中研究的调研,旨在促进NK细胞在转化医学中的研究和应用。
文摘OBJECTIVE: To investigate the effects of anti-HPV16E6-ribozyme (HRz) on phenotype and gene expression of a cervical cancer cell line. METHODS: HRz was designed by computer programs. HRz's activity was identified by cleavage experiments in vitro. HRz and empty eukaryotic plasmids were transfected into CaSKi cells with lipofectin, then renamed CaSKi-R and CaSKi-P, respectively. The expression of ribozyme in transfected cells was observed by RNA dot blot. The amounts of E6 mRNA in three kinds of cells lines were detected by Northern blot. Cell growth curves and soft agar forming ability were studied. The ability of each cell line to form tumors was assessed in nude mice. Apoptosis rates and expression of c-myc, bcl-2, p53 and Fas were detected by flow cytometry (FCM). Antigens of tumor cells, HLA-1, HLA-2, B7-1 and B7-2 were also detected. NK, LAK, and CD(3)AK cells were induced. Their cytotoxicities were detected in CaSKi-R, CaSKi-P, and CaSKi cells. RESULTS: In vitro cleavage reaction demonstrated that HRz could cleave HPV16E6 mRNA in a site-specific manner. HRz could be expressed stably in transfected CaSKi cells. Northern blot analysis showed that E6 mRNA levels were lower in CaSKi-R than in CaSKi. The growth rate of CaSKi-R was slower than those of CaSKi and CaSKi-P. The soft agar-forming rate of CaSKi-R was lower compared with those of CaSKi and CaSKi-P cells. The ability of CaSKi-R to form tumors in nude mice was also poor. The apoptosis rate of CaSKi-R cells was much higher than those of CaSKi and CaSKi-P. HRz could reduce the expression of E6, c-myc and bcl-2 proteins, and increase the expression of p53 as well. HRz could increase the expression of HLA-2, B7-1 and B7-2 antigens. The cytotoxicity of NK, LAK and CD(3)AK cells was much higher in CaSKi-R than in CaSKi-P and CaSKi cells. CONCLUSION: HRz not only reverses the malignant phenotype of CaSKi cells partially, but also induces apoptosis in the cells, and increases sensitivity of CaSKi cells to immune cells.
