• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 D
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• pp.2699-2701
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• 2005

최근에 인상적으로 건강한 CD4 T 세포의 수치를 기준으로 약물의 투여 여부를 결정하는 STI 치료 기법이 제안되었다. 본 논문에서는 수학적 생물학 관점에서 이 치료 방법의 유효성을 알아보고, 환자의 면역 시스템을 분석한다. CD4 T 세포의 수치가 고려된 STI 기법은 기존에 제시된 STI 방법과 비교하여 치료기간과 약물 투여량을 각각 감소시켰고, 환자를 LTNP의 상태로 치료하였다. 또한, CD4 T 세포의 수치를 기준으로 약물 투여 여부를 결정하는 방법이 CTLp의 수치를 증가시키는 것과도 관련이 있음을 확인하였다.

• IMMUNE NETWORK
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• 제23권4호
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• pp.35.1-35.16
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• 2023

Defining the molecular dynamics associated with T cell differentiation enhances our understanding of T cell biology and opens up new possibilities for clinical implications. In this study, we investigated the dynamics of CD5 expression in CD8⁺ T cell differentiation and explored its potential clinical uses. Using PBMCs from 29 healthy donors, we observed a stepwise decrease in CD5 expression as CD8⁺ T cells progressed through the differentiation stages. Interestingly, we found that CD5 expression was initially upregulated in response to T cell receptor stimulation, but diminished as the cells underwent proliferation, potentially explaining the differentiation-associated CD5 downregulation. Based on the proliferation-dependent downregulation of CD5, we hypothesized that relative CD5 expression could serve as a marker to distinguish the heterogeneous CD8⁺ T cell population based on their proliferation history. In support of this, we demonstrated that effector memory CD8⁺ T cells with higher CD5 expression exhibited phenotypic and functional characteristics resembling less differentiated cells compared to those with lower CD5 expression. Furthermore, in the retrospective analysis of PBMCs from 30 non-small cell lung cancer patients, we found that patients with higher CD5 expression in effector memory T cells displayed CD8⁺ T cells with a phenotype closer to the less differentiated cells, leading to favorable clinical outcomes in response to immune checkpoint inhibitor (ICI) therapy. These findings highlight the dynamics of CD5 expression as an indicator of CD8⁺ T cell differentiation status, and have implications for the development of predictive biomarker for ICI therapy.

• Clinical and Experimental Reproductive Medicine
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• 제37권3호
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• pp.231-237
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• 2010

목 적: 반복적 유산 또는 반복적 착상실패 환자의 T 림프구의 Th1 면역반응 정도를 알아보고, T 림프구 활성 정도를 분석하고자 하였다. 연구방법: 반복적 유산 및 반복적 착상실패를 경험한 37명의 환자를 연구군으로 설정하고, 유산이나 불임의 병력이 없이 정상분만의 경력이 있는 11명의 가임 여성을 대조군으로 모집하였다. 유세포분석기를 이용하여, 이들의 말초혈액 중 T helper 세포 내 TNF-$\alpha$와 INF-$\gamma$ 및 IL-10의 발현도를 측정하고 Th1/Th2 세포 비율 (TNF-$\alpha$/IL-10 및 INF-$gamma$/IL-10 발현도)을 계산하여 Th1 면역반응의 우세 정도 및 T 림프구의 활성도를 분석하였으며, 활성 표지자인 CD154와 CD69 발현 정도를 비교하였다. 결 과: 연구군의 평균연령은 $35.3{\pm}4.3$세였으며, 이들에서 T helper cell 내 TNF-$\alpha$/IL-10의 발현 비율이 대조군에 비해 유의하게 높았고 ($42.1{\pm}2.3$ vs. $28.7{\pm}2.7$, p=0.002), CD154와 CD69의 발현율 또한 대조군에 비해 전반적으로 높았다. CD154의 경우, T helper cell ($1.7{\pm}0.5$ vs. $0.3{\pm}0.2$, p=0.038)과 T suppressor cell ($0.6{\pm}0.2$ vs. $0.1{\pm}0.0$, p=0.024) 모두에서 유의하게 높은 발현을 보인 반면, CD69의 경우, 전체 T 림프구 ($5.6{\pm}1.9$ vs. $1.3{\pm}5.4$, p=0.046)와 T suppressor cell ($4.8{\pm}1.3$ vs. $1.8{\pm}0.2$, p=0.035)에서 통계적으로 높은 발현을 확인할 수 있었다. 결 론: 반복적 유산 및 반복적 착상실패를 보이는 여성에서 T 림프구의 활성도와 Th1 면역반응이 증가하였으며 이는, 이들 여성에서 활성화된 T 림프구가 Th1 면역반응을 유도하여 초기 임신의 유지와 착상에 좋지 않은 영향을 미치기 때문으로 생각된다.

• 대한본초학회지
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• 제24권1호
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• pp.73-78
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• 2009

Objectives : In this study, we studied the effect of Pinellia Ternata (PT) on regulatory T cells and CD3+CCR3+ Th2 cells number in asthma model mice. Methods : All mice were immunized on two different days (21 days and 7 days before inhalational exposure) by i.p. injections of 0.2 $m\ell$ alum-precipitated Ag containing 100 ${\mu}g$ of OVA bound to 4 mg of aluminum hydroxide in PBS. Seven days after the second sensitization, mice were exposed to aerosolized ovalbumin for 30 min/day on 3 days/week for 12 weeks(at a flow rate of 250 L/min, 2.5％ ovalbumin in normal saline) and PT (400, 200 mg/kg) were orally administered 3 times a week for 8 weeks. After C57BL/6 mice were orally given of PT, the percentages, cell numbers, phenotype and function of CD4+CD25+Treg cells were determined by flow cytometry. Results : The cell numbers of CD4+CD25+Treg cell subsets were markedly increased in PT treated mice as reported. However, PT significantly reduced the CD3+CCR3+ Th2 cells in PBMC and lung of mice. Conclusions : These results indicate that PT has a deep inhibitory effect on asthma model mice by increase the number of regulatory T cells, and by reducing CD3+CCR3+ Th2 cells.

• IMMUNE NETWORK
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• 제14권4호
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• pp.219-225
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• 2014

We examined the immunogenicity of H-2 class I-restricted and HLA-A2-restricted epitopes through peptide immunization of HLA-A2-transgenic mice that also express mouse H-2 class I molecules. All four of the tested epitopes restricted by H-2 class I robustly elicited T-cell responses, but four of seven epitopes restricted by HLA-A2 did not induce T-cell responses, showing that HLA-A2-restricted peptide epitopes tend to be poorly immunogenic in HLA-A2-transgenic mice. This finding was confirmed in HLA-A2-transgenic mice infected with a recombinant vaccinia virus expressing hepatitis C virus proteins. We examined the precursor frequency of epitope-specific naïve $CD8^+$ T cells in HLA-A2-transgenic and conventional C57BL/6 mice and found that the poor immunogenicity of HLA-A2-restricted peptide epitopes is related to the paucity of naïve $CD8^+$ T-cell precursors in HLA-A2-transgenic mice. These results provide direction for the improvement of mouse models to study epitope repertoires and the immunodominance of human T-cell responses.

• 대한예방한의학회지
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• 제5권1호
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• pp.76-89
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• 2001

OMH which is known for its properties of recruiting vitality, is composed of Polygonum multiflorum Thunb. and Sesamum indicum DC.. This formula is known to possess the properties of recruiting vitality, blackening white hair and expanding life span. 16-week-old SD-Rats were treated with OMH for 16 days. After 24 hours, the rats were treated with MTX(Mthotrexate is oral administrated for 4 days(1mg/kg/day), in order to lower immunity. Then, These rats were classified in to groups, the N-16 group(not specially tested), the Control group(MTX), the OMH-L group(2.5% OMH+MTX)&the OMH-H group(10% OMH+MTX) and 6 rats were assigned to each group. After 18 hours from MTX treatment the organ index of the rats from each group Thymus and Spleen were measured. The percentage of CD+4, CD8+ T cell were measured and compared by flow cytometer. 1) Rats from the OHM-L&OMH-H group showed higher organ indexes of the Thymus and Spleen compared to the rats from the Control Group. This proves that OMH possesses the properties to mitigate degenerations of immunity($F_{thymus}=20.162,\;F_{spleen}=5.882$, ANDVA, p<0.05). 2) The rats from the two OMH groups showed higher rates of CD4+ T cell counts compared to the control group(F=26.906, ANOVA, p<0.05). CD8+ T cell showed lower rates compared to the Control group, but showed no differences within the two OMH groups(F=1.254, ANOYA, p>0.05). CD4+/CD8+ showed higher rates in the two OMH groups compared to the control group which can be thought as a proof that OMH prevents depression of immune response(F=10.554, ANOVA, p<0.05). In this test 16 week-old rats were used, which can be considered as the middle and prime age of the human being. These rats were treated with OMH which ended up showing properties of mitigating degeneration of immune responses and maintaining T-cell rates within the blood. It was possible to study that OMH possesses the properties to increase immune responses.

• IMMUNE NETWORK
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• 제3권3호
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• pp.235-241
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• 2003

Background: The protective immunity against tuberculosis (TB) involves both CD4+ T cells and CD8+ T cells. In our previous study, we defined four Mycobacterium tuberculosis derived peptide epitopes specific for HLA-$A^*0201$ restricted CD8+ T cells ($ThyA_{30-38}$, $RpoB_{127-135}$, $85B_{15-23}$, $PstA1_{75-83}$). In this study, we investigated the immune responses induced by these peptide specific CD8+ T cells in latently and chronically infected people with TB. Methods: We characterized these peptide specific CD8+ T cell population present in PBMC of both TB patients and PPD+healthy people using IFN-${\gamma}$elispot assay, intracellular staining and HLA-A2 dimer staining. Results: The frequency of peptide specific CD8+ T cell was in the range of 1 to 25 in $1.7{\times}10^5$ PBMC based on ex vivo IFN-${\gamma}$ elispot assay, demonstrating that these peptide specific CD8+ T cell responses are induced in both TB patients and PPD+ people. Short term cell lines (STCL) specific for these peptides proliferated in vitro and secreted IFN-${\gamma}$ upon antigenic stimulation in PPD+ donors. Lastly, HLA-$A^*0201$ dimer assays indicated that $PstA1_{75-83}$ specific CD8+ T cell population in PPD+ healthy donors is heterogeneous since approximately 25~33% of $PstA1_{75-83}$ specific CD8+ T cell population in PPD+ healthy donors produced IFN-${\gamma}$ upon peptide stimulation. Conclusion: Our results suggest that MHC class I restricted CD8+ T cell mediated immune responses to M. tuberculosis infection are induced in both TB patients and PPD + people; however, the CD8+ T cell population is functionally heterogeneous.

• 생약학회지
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• 제35권4호통권139호
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• pp.330-337
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• 2004

Based on the traditional application of Carthamus tinctorious L. (CF) as a component of Korean medicinal decoctions, in the present study, we investigated in vitro an immunomodulatory activity of water extract of CF(WECF). Water extract of CF significantly increased the in vitro proliferative responses of spleen cells (SPC). However, addition of WECF during anti-CD3 activation resulted in a significant decrease in SPC proliferation. Flow cytometric analysis showed that WECF addition chanced T and B cell frequencies in anti-CD3-activated spleen cell populations. Using purified cells, it was revealed that WECF is mitogenic to B cells but rather inhibitory to T cell Proliferation. Upon anti-CD3 stimulation, high concentration (1 mg/ml) of WECF significantly inhibited T cell proliferation until day 2 of stimulation. At day 3, anti-CD3-activated cells exposed to WECF recovered their proliferation to the level comparable to control. Although B cell proliferation was also inhibited in proliferation at day 1, it recovered sooner and then was rather augmented by WECF at day 3. These data indicate that WECF down-regulates lymphocyte proliferation at early phase of activation but T cells are more vulnerable than B cells to WECF, However, CD4+ and CD8+ T cells did not differ in WECF-mediated immunotoxicity. Data of propidium iodide (PI) staining showed that WECF accelerates activated T cell, but not B cell, apoptosis and WECF concurrently inhibited cytokine production of activated T cells. Taken together, WECF exhibits B cell mitogenic activity and differential toxicity more pronounced to T cells, suggesting a possible in vivo application of WECF for specific control of T cells without alteration of B cell activity.

• IMMUNE NETWORK
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• 제4권3호
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• pp.143-154
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• 2004

Background: CD27 is recently known as a memory B cell marker and is mainly expressed in activated T cells, some B cell population and NK cells. CD27 is a member of tumor necrosis factor receptor family. Like CD40 molecule, CD27 has (P/S/T/A) X(Q/E)E motif for interacting with TNF receptor-associated factors (TRAFs), and TRAF2 and TRAF5 bindings to CD27 in 293T cells were reported. Methods: To investigate the CD27 signaling effect in B cells, human CD40 extracellular domain containing mouse CD27 cytoplamic domain construct (hCD40-mCD27) was transfected into mouse B cell line CH12.LX and M12.4.1. Results: Through the stimulation of hCD40-mCD27 molecule via anti-human CD40 antibody or CD154 ligation, expression of CD11a, CD23, CD54, CD70 and CD80 were increased and secretion of IgM was induced, which were comparable to the effect of CD40 stimulation. TRAF2 and TRAF3 were recruited into lipid-enriched membrane raft and were bound to CD27 in M12.4.1 cells. CD27 stimulation, however, did not increase TRAF2 or TRAF3 degradation. Conclusion: In contrast to CD40 signaling pathway, TRAF2 and TRAF3 degradation was not observed after CD27 stimulation and it might contribute to prolonged B cell activation through CD27 signaling.

• 대한예방한의학회지
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• 제5권2호
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• pp.93-105
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• 2001

BACKGROUND : Changiga is a hetnal medicine which has been used of the traditional therapeutic agent of asthma. So I examine the effect of Changija on immune Cell&serum OA-specific IgE in BALF in rat asthma model. MATERIAL and METHODS : Rats were sensitized with OA; at day 1 sensitized group and Changiga(CIG) groups were systemically immunized by subcutaneous ingection of 1mg OA and 300mg of Al(OH)3 in a total volume of 2ml. At the same time, 1ml of 0.9% saline containing $6{\times}109$ B. pertussis bacilli was injected by i.p. 14 days, after the systemic immunization, rats received local immunization by inhaling 0.9% saline aerocol containing 2%(wt/vol) OA, A day after local immunization, BAL fluid was collected from the rats. A day after local immunization, rats were orally administered with Changiga extract 14 days, Lymphocyte, CD4+ T-cell CD8+ T-cell counts, CD4+/CD8+ ratio in BALF, change of serum OA-specific IgE level in the peripheral blood were measured and evaluated. RESULT : Changiga showed a suppressive effect on a rat asthme model. Changiga decreased lymphocyte, CD4+ T-cell, CD4+/CD8+ ratio in BALF, serum OA-specific IgE level as compared with the control group, whereas Changiga decreased CD8+ T-cell in BALF with statistical nonsignificance as compared with the control group. CONCLUSION: This study shows that Changiga have a suppressive effect on rat allergic athma model. Changiga would be useful allergic asthma treatment agent.