• 제목/요약/키워드: CD8+T

검색결과 693건 처리시간 0.029초

Associations Between Infiltrating Lymphocyte Subsets and Hepatocellular Carcinoma

  • Guo, Cun-Li;Yang, Hai-Chao;Yang, Xiu-Hua;Cheng, Wen;Dong, Tian-Xiu;Zhu, Wen-Jing;Xu, Zheng;Zhao, Liang
    • Asian Pacific Journal of Cancer Prevention
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    • 제13권11호
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    • pp.5909-5913
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    • 2012
  • Aims: We aimed to analyze the phenotype of tumor-infiltrating lymphocytes (TILs) and non-tumor infiltrating lymphocytes (NILs) in HCC and non-tumor tissues, and evaluate relationships between changes in these cells and the prognosis of HCC. Methods: Lymphocytes were isolated from HCC and corresponding non-tumor tissues and tested by flow cytometry. For comparison, clinical parameters were analyzed. Results: Compared with the non-tumor tissue, tumor tissue had a lower intensity of NK, NKT andCD8+T cell infiltration. TILs had higher intensity of CD4+CD25+Foxp3+regulatory T cell (Treg cells) infiltration compared with that in NILs. The prevalence of Treg cells was associated with fewer CD8 + T lymphocytes in the HCC immune microenvironment. The frequencies of NK cells and CD8+T cells in TILs of HCC patients with metastasis less than 12 months were lower than those without metastasis. However, the frequency of Treg cells was higher than those without metastasis. Conclusion: These results suggest that the frequencies of CD8+T, NK and NKT cells as well as Treg cells in the tumor tissue of HCC are significantly associated with patient survival, and could be applied as predictive indicators for HCC prognosis.

장기간 알콜투여가 생쥐 비장의 세포성 면역 저해에 미치는 면역조직화학적 연구 : T 림프구, IL-2 수용기 및 NK세포의 변화를 중심으로 (Imunohistochemical study on the inhibition of cell mediated immunity in spleen of mouse by chronic alcohol administration : Based on the change of T lymphocytes, IL-2 receptors, and NK cells)

  • 김진택;박인식;안상현
    • 동국한의학연구소논문집
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    • 제5권
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    • pp.197-207
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    • 1996
  • As a mood-altering drug, long-term alcohol consumption have significant harmful effects on the human body and people's mental functioning. This study observed that the suppression of cell mediated immunity induced in spleen of ICR mouse by long-term alcohol administration. After 8% alcohol voluntary administered for 120 days, the splenic tissue irnmunohistochemically stained by following ABC method that used monoclonal antibody including L3T4(CD4), Ly-2(CD8), IL-2 receptor(CD25R) and NK-1.1(CD56) after embedding with paraffin. The results were as follows. 1. The size of marginal zone in splenic white pulp was diminished and the number of macrophage in marginal zone was decreased in test group than control group. 2. After alcohol administration, the number of Helper T lymphocyte, cytotoxic T lymphocyte, and IL-2 receptor were decreased in periarterial lymphatic sheaths of white pulp and penicilla artery of red pulp and the degree of CD4, CD8, and CD25R positive reaction were soften. 3. In test group, the number of NK cell were decreased. These results indicated that the secretion of lymphokine as IL-2 was inhibited by long-term alcohol administration and subsequently prevent to activate and proliferate splenic T lymphocytes and NK cells as cell mediated immunity component.

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갑상선 종양에 있어서 말초형 림프구의 Purine Nucleoside Phosphorylase (PNP) 활성과 T 세포 아형에 관한 연구 (Purine Nucleoside Phosphorylase (PNP) Activity of Lymphocytes and T Cell Subsets in Peripheral Blood in Thyroid Tumors)

  • 김동수
    • 대한핵의학회지
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    • 제26권1호
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    • pp.1-7
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    • 1992
  • 저자는 1991년 1월부터 동년 8월 사이에 부산대학교 병원 내과 외래에서 임상증상, 이학적 소견 및 각종 검사소견과 병리조직학적으로 진단된 단순 증식성 갑상선종 환자 20예, 갑상선선종 환자 9예 및 갑상선암환자 20예와 건강대조군 11례에서 말초혈 림프구의 PNP활성을 측정하고 $CD4^+$$CD8^+$ 세포를 동시에 검색하여 분석할 성적을 다음과 같이 요약한다. 1) 말초혈 림프구의 PNP 활성은 건강 대조군 및 단순 증식성 갑상선종 보다 갑상선선종 및 암환자에서 의의있게 증가하거나 증가하는 경향이 있었다. 2) 말초혈의 $CD8^+$ 세포 비율은 갑상선암환자에서 건강 대조군, 단순 증식성 갑상선종 및 갑상선선종환자 보다 각각 의의 있게 감소하거나 감소하는 경 향이 있었다. 3) 말초혈의 CD4/CD8비는 갑상선암환자에서 건강 대조군, 단순 증식성 갑상선종 및 갑상선선종환자보다 각각 의의 있게 증가하거나 증가하는 경향이 있었다. 이상의 결과에 의하면 갑상선암환자에서는 말초혈의 억제/세포상해 T 세포의 감소에 의한 세포성 면역능의 이상이 있고, 말초혈 림프구의 PNP활성의 측정은 갑상선종양환자의 면역 상태를 파악하는데 도움이 되는 검사라고 생각된다.

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Telomerase Activity is Constitutively Expressed in the Murine $CD8^+$ T Cells and Controlled Transcriptionally and Post-Translationally

  • Kim, SoJung;Kim, MiHyung;Kim, KilHyoun
    • IMMUNE NETWORK
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    • 제4권3호
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    • pp.166-175
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    • 2004
  • Background: Telomerase, a ribonucleoprotein enzyme capable of synthesizing telomeric repeats, attracts attention for its possible role in determining the replicative capacity of normal somatic cells, transformed cells, and cells of the germline lineage. Differently from normal somatic cells with no telomerase activity, normal lymphocytes has been reported to have telomerase activity comparable to that found in transformed cells during development and activation, which substantiate a role in supporting the capacity of lymphocytes for extensive clonal expansion. Methods: Here, in order to define the telomerase regulation in murine T lymphocytes, telomerase activity in cloned murine $CD8^+$ T cells and naive $CD8^+$ T cells isolated from C57BL/6 mice was examined. Next, the regulatory mechanism of telomerase activity at transcriptional and post- translational levels was investigated by determining the expression level of the TERT protein, a key component for telomerase activity. Results: It was demonstrated that telomerase activity was expressed in an inactivated state as well as in an activated state in the murine $CD8^+$ T lymphocytes by using TRAP assay. The increase of telomerase activity was partially dependent on the net increase of TERT expression. Also, telomerase activity was decreased after treatment with protein kinase inhibitors, indicating that telomerase activation was prevented by inhibition of phosphorylation. Conclusion: Therefore, these results suggest that telomerase activity is constitutively expressed in the murine resting T lymphocytes and controlled by both transcriptional regulation and post- ranslational modifications.

유세포분석기를 이용한 정상치수조직과 염증성 치수조직 내의 임파구 분포에 관한 연구 (FLOW CYTOMETRIC ANALYSIS OF LYMPHOCYTES IN NORMAL AND INFLAMED PULP)

  • 김선아;배광식;임성삼
    • Restorative Dentistry and Endodontics
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    • 제22권1호
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    • pp.374-387
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    • 1997
  • The purpose of this study was to examine the distribution of lymphocyte populations in normal, reversibly inflamed and irreversibly inflamed human dental pulp tissues using flow cytometry. Flow cytometry, with specific antibody and fluorochrome reagent allows us to know cellular properties of hematolymphoid cells by measuring fluorescence of stained cells. Before extirpation of pulps in routine endodontic treatment, the clinical diagnosis were performed by symptom. The extirpated pulp tissues were divided into normal pulp group (N=5), reversible pulpit is group(N=10) and irreversible pulpitis group(N=7). The specimen was placed into RPMI 1640 medium, minced into small pieces, and then digested in medium with collagenase. The cell suspension was resuspended in PBS for monoclonal antibody staining of T lymhocytes(CD3+), B lymphocytes (CD19+), T helper cell (CD4+) and T supressor cell (CD8+). The percentages of cells were counted by FACStar(BD) flow cytometer. Following results were obtained; 1. In the most normal and inflamed pulps, the percentages of T lymphocyte, B lymphocytes, T helper cell and T suppressor/cytotoxic cell were less than 1 % in total counted pulpal cells. 2. The higher percentages of T, B, T helper and T suppressor cells were observed in irreversible pulpitis group as compared with the normal pulp and reversible pulpitis group but the differences between groups were not statistically significant (p>0.05). 3. The percentages of T helper cells (CD4 + cells) were greater than that of T suppressor/cytotoxic cells (CD8 + cells) in the inflamed pulps.

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Detection of Foreign Antigen-specific $CD4^+Foxp3^+$ Regulatory T Cells by MHC Class II Tetramer and Intracellular CD154 Staining

  • Choi, Jin Young;Eo, Seong Kug
    • IMMUNE NETWORK
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    • 제13권6호
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    • pp.264-274
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    • 2013
  • The unrestricted population of $CD4^+Foxp3^+$ regulatory T (Treg) cells, which have been known to control the expression of autoimmune diseases and protective immunity to inflammatory reactions, has led to greater appreciation of functional plasticity. Detecting and/or isolating Ag-specific $CD4^+Foxp3^+$ Tregs at the single cell level are required to study their function and plasticity. In this study, we established and compared both MHC class II tetramer and intracellular CD154 staining, in order to detect $CD4^+Foxp3^+$ Treg specific for foreign Ag in acute and chronic infections with lymphocytic choriomeningitis virus (LCMV). Our results revealed that MHC class II tetramer staining showed a lower detection rate of LCMV $GP_{66-77}$-specific $CD4^+$ T cells because most of MHC class II tetramers were unbound and unstable when combined staining was performed with intracellular cytokines. In contrast, intracellular CD154 staining was revealed to be easier and simple for detecting LCMV $GP_{66-77}$-specific $CD4^+$ T cells, compared to MHC class II tetramer staining. Subsequently, we employed intracellular CD154 staining to detect LCMV $GP_{66-77}$-specific $CD4^+Foxp3^+$ Tregs using $Foxp3^{GFP}$ knock-in mouse, and found that LCMV $GP_{66-77}$-specific $CD4^+Foxp3^+$ Tregs and polyclonal $CD4^+Foxp3^+$ Tregs showed differential expansion in mice infected with LCMV Arms or Cl13 at acute (8 and 13 days pi) and chronic phases (35 days pi). Therefore, our results provide insight into the valuable use of intracellular CD154 staining to detect and characterize foreign Ag-specific $CD4^+Foxp3^+$ Treg in various models.

Bispecific Antibody-Bound T Cells as a Novel Anticancer Immunotherapy

  • Cho, Jaewon;Tae, Nara;Ahn, Jae-Hee;Chang, Sun-Young;Ko, Hyun-Jeong;Kim, Dae Hee
    • Biomolecules & Therapeutics
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    • 제30권5호
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    • pp.418-426
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    • 2022
  • Chimeric antigen receptor T (CAR-T) cell therapy is one of the promising anticancer treatments. It shows a high overall response rate with complete response to blood cancer. However, there is a limitation to solid tumor treatment. Additionally, this currently approved therapy exhibits side effects such as cytokine release syndrome and neurotoxicity. Alternatively, bispecific antibody is an innovative therapeutic tool that simultaneously engages specific immune cells to disease-related target cells. Since programmed death ligand 1 (PD-L1) is an immune checkpoint molecule highly expressed in some cancer cells, in the current study, we generated αCD3xαPD-L1 bispecific antibody (BiTE) which can engage T cells to PD-L1+ cancer cells. We observed that the BiTE-bound OT-1 T cells effectively killed cancer cells in vitro and in vivo. They substantially increased the recruitment of effector memory CD8+ T cells having CD8+CD44+CD62Llow phenotype in tumor. Interestingly, we also observed that BiTE-bound polyclonal T cells showed highly efficacious tumor killing activity in vivo in comparison with the direct intravenous treatment of bispecific antibody, suggesting that PD-L1-directed migration and engagement of activated T cells might increase cancer cell killing. Additionally, BiTE-bound CAR-T cells which targets human Her-2/neu exhibited enhanced killing effect on Her-2-expressing cancer cells in vivo, suggesting that this could be a novel therapeutic regimen. Collectively, our results suggested that engaging activated T cells with cancer cells using αCD3xαPD-L1 BiTE could be an innovative next generation anticancer therapy which exerts simultaneous inhibitory functions on PD-L1 as well as increasing the infiltration of activated T cells having effector memory phenotype in tumor site.

장기간 알콜 투여가 생쥐 가슴샘에서 T 림프구의 분화와 IL-2 분비 저해에 미치는 면역조직화학적 연구 (Immunohistochemical Study on the Inhibition of T lymphocytic Differentiation and Secretion of IL-2 in Mouse Thymus by Chronic Alcohol administration)

  • 김진택;박인식;안상현
    • 동국한의학연구소논문집
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    • 제5권
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    • pp.187-196
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    • 1996
  • Alcohol is a major risk factor for several diseases and especially excessive, long-term alcohol consumption are caues the damage of immunity such as the inhibiton of secretion of lymphokine and proliferation of immune component cell. This study observed that the inhibition of T lymphocytic differentiation and secretion of interleukin 2(IL-2) induced in thymus of ICR mouse by chronic alcohol administration. After 8% alcohol voluntary administered for 120 days, the thymic tissue immunohistochemically stained by following ABC method that used monoclonal antibody including L3T4(CD4), Ly-2(CD8), and IL-2 receptor(CD25R) after embedding with paraffin. The results were as follows. 1. The size of thymic medulla in test group reduced than control group. 2. The number of helper T lymphocyte, cytotoxic T lymphocyte, and IL-2 receptor were decreased in thymic medulla and cortico-medullary junction of test group and the degree of CD4, CD8, and CD25R positive reaction were soften in test group. These results indicated that the secretion of IL-2 in thymus was inhibited by chronic alcohol administration and subsequently prevent to differentiate from thymocytes to T lymphocytes. As this view, cell mediated immunity were reduced by chronic alcohol administration.

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Effect of small Black Soybean Fraction on the T cell-mediated Immune Responses in vivo and Proliferation of Leukemia Cells in vitro

  • Oh, Chang-Ho;Shin, Tae-Yong;Chae, Byeong-Suk;Lee, Kyu-Hee;Kim, Ju-Sin;Moon, Mi-Kyeong;Cho, Moon-Gu;Kim, Jong-Hwa;Oh, Suk-Heung;Lee, Tae-Kyoo;Kim, Dae-Keun
    • Natural Product Sciences
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    • 제13권2호
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    • pp.123-127
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    • 2007
  • We investigated effect of small black soybean fraction (SBSF) T cell-mediated responses for tumor surveillance and proliferation in leukemia cells in vitro. Each SBSF butanol fraction (SBSFBu) and SBSF chloroform fraction (SBSFCh) was administered p.o. once a day far 21 days in BALB/c mice and then levels of serum cytokines and subpopulation of lymphocytes were measured. Moreover, SBSF fraction was treated into the cultured various cell lines for proliferation in leukemia cell lines, NO production by RAW264.7 cells, and expression of p53 gene in U937 leukemia cells. These results showed that SBSFBu increased levels of serum IL-4but not IL-2 and IFN-${\gamma}$, and increased expression of CD4$^+$ T cells and CD8$^+$ T cells in splenocytes in vivo, while SBSFCh increased levels of serum IL-2 and IFN-${\gamma}$ but decreased IL-4, and increased CD8$^+$ T cells but not CD4$^+$ T cells. Moreover, both of SBSFBu and SBSFCh inhibited proliferation of HL60, U937, and L1210 leukemia cell lines in a dose-dependent manner, up-regulated NO production by RAW264.7 cells in a dose-dependent manner, and enhanced expression of p53 gene in U937 leukemia cells. Our findings indicate that SBSFBu and SBSFCh may enhance T cell-dependent immune responses, and that both of SBSFBu and SBSFCh may inhibit proliferation of leukemia cells by up-regulation of NO production and expression of p53 gene.

Pilocarpine에 의한 경련중첩증 후 해마에서 Tbr2 발현에 관한 연구 (Expression of Tbr2 in the Hippocampus Following Pilocarpine-induced Status Epilepticus)

  • 최윤식
    • 생명과학회지
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    • 제23권12호
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    • pp.1532-1540
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    • 2013
  • Tbr2는 T-box family 전사인자의 하나로써 뇌의 발달, 전구세포의 증식, 그리고 CD8+ T 세포와 자연살상세포의 분화와 기능에 중요한 역할을 하는 것으로 알려져 있다. 본 연구는 마우스에서 pilocarpine을 이용하여 경련중첩증을 유도한 후 나타나는 병리기전에 Tbr2의 연관성을 확인하였다. 경련중첩증은 해마의 CA3, hilus 그리고 조롱박피질 등에서 뚜렷한 신경세포의 손상을 유발하였다. 흥미롭게도 Tbr2를 이용한 조직 염색에서 경련중첩증 2일 후에 CA3와 조롱박피질에서 면역반응성이 뚜렷하게 증가하는 것을 관찰하였다. 또한 CA3와 조롱박피질에서 Tbr2를 발현하는 세포는 미세아교세포와 단핵구, CD8+ T세포 또는 자연살상세포 등 백혈구의 표지물질인 CD11b 와 이중염색되는 것을 발견하였다. Tbr2와 CD11b에 동시에 염색된 세포는 아메바 모양의 형태를 갖추고 있는 것을 발견하였다. 게다가 혈관 내피세포에서 발혈되는 platelet endothelial cell adhesion molecule-1(PECAM-1)과 이중 염색한 결과 Tbr2를 발현하는 세포가 CA3 지역의 혈관내에 다량 존재하는 것을 확인하였다. 이상의 결과를 종합할 때 Tbr2를 발현하는 세포는 뇌 조직으로 이주하는 백혈구일 가능성이 높음을 보여준다. 이러한 결과는 경련중첩증에 따른 신경병리기전에 Tbr2가 관여할 가능성이 높음을 처음으로 제시하였다.