• 제목/요약/키워드: CD40L

검색결과 162건 처리시간 0.018초

Role for CD40 and CD40L Expression in Generating CD8 T Cell Response to Minor Histcompatibility Antigen, H60

  • Jung, Kyoung-Min;Choi, Eun-Young
    • IMMUNE NETWORK
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    • 제7권4호
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    • pp.173-178
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    • 2007
  • Background: We studied the role for expression of CD40 and CD40L by CD4 and CD8 T cells in the generation of CD8 T cell response to minor histocompatibility antigen, H60. H60 is a cellular antigen to which CD8 responses require CD4 T cell help. Methods: CD40- or CD40L-deficient mice were adoptively transferred with normal CD4 or CD8 T cells or with memory CD4 or CD8 T cells, and were immunized with male H60 congenic splenocytes to induce CD8 T cell response to H60. Peripheral blood CD8 T cell from the immunized mice were stained with the H60 tetramer. Results: CD8 T cell response to H60 was not induced in both CD40- and CD40L-deficient mice. Adoptive transfer of $CD40^{+/+}$ CD8 T cells into CD40-deficient mice did not compensate the defect in inducing CD8 T cell response to H60, while the H60-specific CD8 T cells were activated in the CD40-deficient mice that were adoptively transferred with $CD40^{+/+}$ CD4 T cells. Adoptive transfer of $CD40L^{+/+}$ CD4 T cells into CD40L-deficient mice induced primary CD8 T cell response for H60 and the presence of $CD40L^{+/+}$ CD4 T cells was required even for memory CD8 T cells response to H60. Conclusion: Our results suggest that the CD40-CD40L interaction mediates the delivery of CD4 T cell help to naive and memory H60-specific CD8 T cells. While the expression of CD40L by CD4 T cells is essential, signaling through CD40 on CD8 T cells is not required for the induction of CD8 T cell response to H60.

CD40L 발현 K562 세포주를 이용한 시험관내 B 세포 증식과 항원제공능 증가 (Enhancement of Proliferation and Antigen Presentation of Human B Cells in Vitro by K562 Cells Expressing CD40L)

  • 박정용;윤성희;김은경;윤선옥;손현정;김태규
    • IMMUNE NETWORK
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    • 제7권2호
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    • pp.80-86
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    • 2007
  • Background: CD40-activated B (CD40-B) cells might be an attractive source of autologous antigen-presenting cells (APCs) for immunotherapy due to the convenience to obtain from peripheral blood and expand in vitro. Moreover, CD40-B cells were found to be comparable with DCs in their capacity to raise antigen-specific CD8+ T cells. Here, we have established K562 cells expressing CD40L to expand CD40-activated B cells used for APCs. Methods: After activation of B cell by K562/CD40L, CD40-B cells were examined by counting B cell numbers. Surface expression of CD54, CD80, CD86 and HLA class II was measured by flow cytometry. The CD40-B cells were tested for its function as APC by mixed lymphocyte reactions (MLR) and by induction of T cell responses specific for pp65 peptide in vitro. Results: The expansion of B cells by K562/CD40L increased about 6-folds compared with anti-CD40 or K562. Furthermore, the expression of CD54, CD80, CD86 and HLA class II was up-regulated by K562/CD40L. B cells by K562/CD40L showed comparable antigen presentation activity with mature DCs as shown in MLR, INF-${\gamma}$ ELISPOT assay. Conclusion: These results suggest that K562/CD40L could be used to generate activated B cells as potent APCs which could be useful for cellular vaccination and adoptive immunotherapy.

카드뮴 노출에 따른 북방전복, Haliotis discus hannai (Ino, 1953) 의 hemolymph 및 hepatopancreas의 효소활성의 변화 (Changes of enzyme activity in the hemolymph and hepatopancreas of the abalone, Haliotis discus hannai (Ino, 1953) exposed to cadmium)

  • 민은영;이정식;곽인실;김재원;강주찬
    • 한국패류학회지
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    • 제30권1호
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    • pp.41-49
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    • 2014
  • 본 연구는 카드뮴 노출에 따른 북방전복, Haliotis discus hannai의 hemolymph 및 hepatopancreas의 효소활성에 대한 변화를 관찰하였다. 북방전복은 카드뮴 0, 5, 10, 20 및 40 Cd ${\mu}g/L$의 농도에서 4 주간 노출시킨 결과, hemolymph의 phenoloxidase (PO) 활성은 40 Cd ${\mu}g/L$ 농도에서 4주 후에 유의하게 감소하였으나, alkaline phosphatase (ALP), aspartate aminotransferase (AST) 및 alanine aminotransferase (ALT) 활성은 40 Cd ${\mu}g/L$ 농도에서 4주 후에 유의한 증가를 나타냈다. 또한 hemolymph의 칼슘(Ca) 농도는 20 및 40 Cd ${\mu}g/L$의 농도에서 4주 후에 유의한 감소를 나타냈다. 한편 hepatopancreas의 superoxide dismutase (SOD) 활성은 20 및 40 Cd ${\mu}g/L$ 농도에서, catalase (CAT) 활성은 40 Cd ${\mu}g/L$ 농도에서 2주 후에 유의한 증가를 나타냈다. 따라서 카드뮴에 노출된 북방전복 hemolymph와 hepatopancreas의 효소활성은 적어도 카드뮴 농도 40 Cd ${\mu}g/L$에서 변동이 있을 것으로 예상되며, 이들 효소활성은 연안의 중금속 오염 모니터링의 기초 자료로 활용할 수 있을 것으로 생각된다.

KU812세포에 의한 쌀 알레르겐 특이적 IgE항체 합성의 유도 (Induction of Rice Allergen-Specific IgE Synthesis by KU8l2 Cells)

  • 심선엽;요시노리 카타쿠라;시라하타 사네타카
    • 생명과학회지
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    • 제17권11호
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    • pp.1492-1496
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    • 2007
  • CD40L를 발현하는 KU812세포와 CD40를 발현하는 항원 특이적 B 세포의 배양을 통해 IgE 클라스 스위치가 유도된다. 본 연구자는 체외면역법에 의해 건강인의 말초혈액을 이용하여 쌀 알레르겐 특이적 IgM 항체를 생성하는 B 세포주를 수립하였다. 본 연구에서는 KU812세포에 의한 쌀 알레르겐 특이적 IgE 항체의 유도를 시도하였다. 배양 전, 쌀 알레르겐 특이적 B 세포주, RA9G11과 PMA와 ionomycin을 6시간 처리하여 활성화된 KU812세포에서 CD40와 CD40L 발현량을 flow cytomerty를 통화여 각각 확인하였다. RA9G11세포와 활성화된 KU812세포는 높은 수준의 CD40와 CD40L를 각각 발현하였다. 쌀 알레르겐 특이적 IgE항체 합성 유도를 위해, 여러 가지 농도의 IL-4 존재하에, RA9G11세포와 활성화된 KU812세포를 12일 동안 배양하였다. IgE 정상영역의 mRNA 발현량과, 쌀 알레르겐 특이적 IgE 항체 생성 세포가 모든 조건에서 확인되었으며, 특히 50U의 L-4 농도 하에서 같은 비율의 RA9G11과 활성화된 KU812세포를 배양했을 때, IgE 합성이 가장 높았다. 따라서 활성화된 KU812세포에 의한 쌀 알레르겐 특이적 IgE 합성은 알레르기 질환의 치료 및 예방에 관한 연구에 기여할 것으로 사료된다.

CD40-CD40 Ligand Interactions in the Production of IL-12 and IFN-γ by Tuberculous Pleural Mononuclear Cells

  • Song, Chang-Hwa;Nam, Hyun-Hee;An, Jeun-Ok;Lee, Ji-Sook;Kim, Hwa-Jung;Park, Jeong-Kyu;Suhr, Ji-Won;Jung, Sung-Soo;Na, Moon-Jun;Paik, Tae-Hyun;Jo, Eun-Kyeong
    • IMMUNE NETWORK
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    • 제2권3호
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    • pp.142-149
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    • 2002
  • Background: Our previous study showed that purified protein derivative (PPD)-stimulated pleural mononuclear cells (PMC) from tuberculous pleurisy (Tbp) produced significantly more $IFN-{\gamma}$ (10- to 70-fold) after in vitro PPD stimulation than freshly isolated pleural cells from malignant pleurisy. The present study was designed to determine whether blocking the CD40-CD40 ligand (CD40L) interaction decreases $IFN-{\gamma}$ production by altering IL-12 levels. Methods: IL-12 and $IFN-{\gamma}$ production after neutralizing anti-CD40L antibody treatment was compared to the efficacy of anti-CD80, anti-CD86, and a combination of anti-CD80 and CD86 (CD80+86) monoclonal antibodies (mAb). These activities were measured by enzyme-linked immunosorbent assays (ELISAs) and reverse transcription-polymerase chain reaction (RT-PCR), after in vitro stimulation with PPO antigen (Ag). Results: Neutralization of CD80, CD86 and CD80+86 did not decrease $IFN-{\gamma}$ and IL-12 production in Tbp-PMC, whereas neutralization of CD40L significantly depressed IL-12 p40 and $IFN-{\gamma}$. In addition, neutralization of CD40L completely inhibited IL-12 p40 and $IFN-{\gamma}$ mRNA expression. Conclusion: The CD40-CD40L interaction might play a major role in IL-12 and $IFN-{\gamma}$ production in Tbp-PMC, thus contributing to protective immunity in human tuberculosis.

Hyper IgM Syndrome 환자에서 얻은 림프절 및 말초혈액 B세포의 특성 (Characterization of B Cells of Lymph Nodes and Peripheral Blood in a Patient with Hyper IgM Syndrome)

  • 김동수;신경미;양우익;신전수;송창화;조은경
    • Clinical and Experimental Pediatrics
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    • 제46권2호
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    • pp.128-136
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    • 2003
  • 목 적 : Hyper IgM syndrome(HIGM)은 크게 세 부류로 나누는데, CD40L 분자의 돌연변이로 초래되며 X-linked로 유전되는 형태를 HIGM1이라고 하고, 상염색체성 열성 형태로 유전되면서 CD40L는 정상적으로 표현되는 형태로 activation-induced cytidine deaminase(AID) 유전자에 이상 때문에 오는 경우를 HIGM2로 분류하고 있다. 다른 한 부류는 X-linked HIGM 증후군의 매우 드문 한 형태로서 발한 저하성 외배엽 이형성증이 동반된 경우로, 이 질환은 전사인자인 nuclear factor ${\kappa}B$의 활성화에 관여하는 nuclear factor ${\kappa}B$ essential modulator를 coding하는 유전자의 돌연변이 때문에 오는 것으로 알려져 있다. 연구자들은 HIGM2와 유사하지만 AID 유전자에 변이는 없는 새로운 형태의 HIGM 환자의 말초 B세포를 이용하여 병인을 조사하고자 본 연구를 시도하였다. 방 법 : 환자의 말초혈액 단핵구를 분리하고, EBV로 immortalization을 시켜 Cycle TEST PLUS DNA Reagent kit를 이용하여 cell cycle을 분석하였다. 환자의 말초혈액 T 세포에서 CD40L의 표현을 immunostaining으로 알아보고, RNA를 추출하여 RT-PCR을 하고 direct sequencing을 통하여 CD40L 유전자의 돌연변이 부위를 찾아보았다. 아울러 AID 유전자의 돌연변이를 찾기 위하여 같은 방법으로 sequencing하고 조사하였다. 환자의 림프절을 병리학적인 검사를 시행하고 CD3, CD23, CD40, Fas-L, bcl-2, BAX의 표현을 알아보기 위하여 immunostaining을 실시하였다. 결 과: 림프절의 광학적 소견은 반응성 여포증식의 소견을 보였으며, 여포와 단구양 증식은 B-세포 표시인자인 L26에 양성을 보였고, 대부분의 형질세포는 IgM에 양성을 보였다. 여포는 CD40, Fas, BAX에 양성반응을 보이고, bcl-2와 Fas-L에 음성반응을 보였다. 말초혈액 B 림프구를 이용하여 cell cycle을 분석한 결과 정상(17.9%)에 비하여 G2/mitosis phase(M3 in figure)가 현저하게 감소(8.5%)되어 있는 양상을 보여주고 있으며, IL-4로 자극한 경우에는 정상인에서 보여주는 양상으로 회복되는 양상을 볼 수 있었다. 단핵수에서 CD40L의 표현은 정상이었고 CD40L 유전자에도 돌연변이는 발견할 수 없었으며, HuAID 유전자에도 돌연변이를 발견할 수 없었다. 결 론 : 환자의 말초혈액 B림프구를 통한 연구 결과, 기존에 보고 되어진 HIGM2 형태와 임상적으로는 비슷하지만, 정상적인 AID유전자를 보이고, G2/mitosis phase가 정상에 비하여 감소된, 새로운 형태의 HIGM이라고 여겨진다.

The relationship between serum adiponectin and inflammatory cytokines in obese Korean juveniles

  • Byun, Sung Hwan;Kwon, Eun Byul;Kim, Se Young
    • Clinical and Experimental Pediatrics
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    • 제57권12호
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    • pp.533-537
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    • 2014
  • Purpose: Obesity is related to systemic inflammatory processes causing cardiovascular complications. Intercellular adhesion molecule-1 (ICAM-1), CD40 ligand (CD40L), P-selectin are newly described mediators of inflammation and have a significant effect in atherosclerosis. Adiponectin has shown anti-inflammatory effects in adults. The aim of this study was to evaluate the relationship between adiponectin and inflammatory mediators in children and adolescents. Methods: Fifty children or adolescents, twenty two with a body mass index (BMI) over 95th percentile, and twenty eight with a BMI below 75th percentile were included in the study. Serum soluble ICAM-1 (sICAM-1), P-selectin, CD40L, lipid profiles, aspartate aminotransferase, alanine aminotransferase, glucose and insulin were measured to evaluate associations with adiponectin. Comparison of these variables was performed between the obese and the nonobese group. Results: We found a adiponectin to be significant lower and sICAM-1 significant higher in the obese group compared to the nonobese group, but there were no significant differences in P-selectin and soluble CD40L. Adiponectin was negatively associated with ICAM-1 and P-selectin in the obese group. Conclusion: Negative associations of adiponectin with ICAM-1 and P-selectin in obese children and adolescents suggest that serum adiponectin level may represent the inflammatory status.

카드뮴-113 NMR을 이용한 폴리아크릴산의 카드뮴(Ⅱ) 이온에 대한 결합자리의 특성연구 (Characterization of the Nature of Cd(II) Ion Binding Sites on Poly(acrylic acid) Using$^{113}Cd$NMR)

  • 정근호;구자응;신현상;문희정
    • 대한화학회지
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    • 제40권1호
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    • pp.44-49
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    • 1996
  • 카드뮴-113 NMR을 이용하여 수용액속에서 카드뮴 이온과 유기산(아세트산, 벤조산 및 프로판산)과의 결합 특성을 알아보았고 여기서 얻어진 결과를 폴리아크릴산(PAA)의 결합자리의 특성연구에 응용하였다. 유기산에 결합된 카드뮴 화합물의 카드뮴-113 NMR 화학적이동 결과 분석으로부터, $CDL^+$$CDL_2$(L:카르복실기) 화학종에 해당하는 화학적이동값은 각각 -22에서 -24ppm과 -39에서 -40ppm의 범위를 나타냈다. 카드뮴과 폴리아크릴산 화합물에서는 폴리아크릴산 대 카드뮴의 농도비를 12에서 118eq/mol로 증가시킬 때 화학적 이동값이 -36.6ppm에서 -38.2ppm으로 변하였다. 또한, 폴리아크릴산 대 카드뮴의 농도비를 고정시키고 ([PAA]/[Cd] = 39ep/mol) 용액의 pH를 1에서 6까지 변화시킬 때 화학적이동값은 1.6ppm에서 -37.6ppm으로 변하였다. 이 결과는 폴리아크릴산 대 카드뮴의 농도비 변화 실험에서 주화학종은 1:2 착물($CdL_2$)이고 농도비가 증가하면 1:2 착물형성도 증가하는 것을 보여준다.또한, 낮은 pH에서는 1:1착물($CdL^+$)이 우세하고 pH가 증가하면서 1:2 착물($CdL_2$)이 증가한다는 것을 알 수 있었다.

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Platelets Induce Proliferation of Human Umbilical Vein Endothelial Cells via CD154-CD40 Pathway Independently of VEGF

  • Cho, Wha-Jung;Ko, Eun-Mi;Cheon, In-Su;Jeoung, Doo-Il;Kim, Young-Myeong;Choe, Jong-Seon
    • IMMUNE NETWORK
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    • 제8권3호
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    • pp.75-81
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    • 2008
  • Background: Platelets take part in repairing the lesions of endothelial damage. To understand the molecular mechanism of this process, we tested the hypothesis that CD154 expressed on activated platelets stimulates proliferation of human endothelial cells. Methods: The expression levels of CD154 and CD40 on platelets and endothelial cells, respectively, were measured by flow cytometry and confocal microscopy. Function-blocking monoclonal antibody against CD154 was developed after immunization with CD154-transfected L cells. Results: An anti-CD40 agonist antibody and soluble CD154 both induced significant proliferation of endothelial cells. In addition, a function-blocking anti-CD154 antibody inhibited the platelet-induced proliferation of endothelial cells, indicating that the CD154-CD40 pathway is involved in these cellular interactions. An anti-VEGF antibody failed to inhibit the proliferation. This, in addition to the fact that very small amounts of VEGF are released from platelets or endothelial cells, suggests that VEGF does not play an important role in the platelet-stimulated proliferation of endothelial cells. Conclusion: Our results indicate that platelets induce proliferation of endothelial cells by CD154-CD40 interactions independently of VEGF.

Linear Alkylbenzene Sulfonate의 생분해에서 Cd(II), Cu(II) 및 Zn(II)의 저해효과에 대한 연구 (A Study of the Inhibiton Effect of Cd(II), Cu(II) & Zn(II) to the Biodegradation of Linear Alkylbenzene Sulfonate)

  • 선일식;정일현
    • 한국응용과학기술학회지
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    • 제9권2호
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    • pp.165-174
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    • 1992
  • The standardized activated sludge for the biodegradation test of anion surfactants has been produced from the collected microorganisms in the soil and the wastewaters treatment plant. The activated sludge was kept under control of the pH, dissolved oxygen, microorganisms and inoculated the basal medium flasks with LAS and LAS mixed with heavy metals [Cd(II), Cu(II), Zn(II)]. Based of results, the inhibition effect(%) of heavy metals in LAS biodegradation were 1. All 1% when LAS 30mg/l-Cd(II), Cu(II) and Zn(II) 0.1mg/l, respectively 2. All 1${\sim}$10% when LAS 30mg/l-Cd(II), Cu(II) and Zn(II) 1mg/l, respectively 3. All 10${\sim}$40% when LAS 30mg/l-Cd(II), Cu(II) and Zn(II) 10mg/l, respectively 4. All 30${\sim}$65% when LAS 30mg/l-Cd(II), Cu(II) and Zn(II) 100mg/l, respectively And toxicity order of heavy metals to the microorganisms in LAS biodegradation were Cd>Cu>Zn in low concentration(0.1${\sim}$1mg/l)and Cd>Zn>Cu in high concentration(10${\sim}$100mg/l).