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작성자 : 관리자 날짜 : 작성일15-04-09 23:05 조회 : 3,540회본문
제 492 회 생명과학연구소 세미나 2015.04.09 |
Cytoplasmic domain of CTLA-4 in T cells: From biology to pharmacology
최제민 교수 (한양대학교 생명과학과)
The T cell protein cytotoxic T lymphocyte antigen 4 (CTLA-4) was identified as a critical negative regulator of T cell response and related diseases over 15 years ago. It has long been suggested that CTLA-4 transmits an inhibitory signal to the cells as well as it competes with CD28 to bind to B7 molecule of antigen presenting cells. Although CTLA-4 pathway has been well defined to regulate CD28 signaling and CTLA-4Ig is under clinical investigation, and there are 4 natural splicing variants of CTLA-4 including the only cytoplasmic domain without its extracellular domain, the role of cytoplasmic domain of CTLA-4 has received less attention. Here we investigated the role of cytoplasmic domain of CTLA-4 (ctCTLA-4) by transducing recombinant ctCTLA-4 protein into the T cells using cell penetrating peptide (CPP) based protein delivery technique. CPP-ctCTLA-4 protein could be efficiently delivered into the primary mouse and human T cells which are relatively difficult to transfect, and regulated T cell response upon TcR stimuli such as cytokine production and proliferation with decrease of phosphorylation of intracellular signaling molecules. Furthermore, in vivo administration of CPP-ctCTLA-4 protein could regulate allergic airway inflammation, autoimmune arthritis, autoimmune encephalitis, human skin graft rejection with decrease of effector T cell differentiation such as Th1, Th2, Th17, etc. suggest the only cytoplasmic domain of CTLA-4 without interfering ectodomain of CD28 regulates effector T cell functions and disease pathogenesis, thus CPP-ctCTLA-4 could be a novel alternative method to regulate intracellular signaling of activated T cells other than CTLA-4Ig in pharmaceutical application.
Education
PhD. March 2002-August 2006 Department of Biotechnology, Yonsei University, Seoul, Republic of Korea (Supervisor; Prof. Sang-Kyou Lee)
Ms. March 2000-February 2002 Department of Biotechnology, Yonsei University, Seoul, Republic of Korea (Supervisor; Prof. Ryung Ryang)
Bs. March 1996-February 2000 Department of Biotechnology, Yonsei University, Seoul, Republic of Korea
Research Experiences
Associate Professor, Mar 2015-present Department of Life Science, Hanyang University, Seoul, Republic of Korea
Assistant Professor, Mar 2010-Feb 2015 Department of Life Science, Hanyang University, Seoul, Republic of Korea
Post-doctoral Associate, Feb 2007-Feb 2010 Department of Immunobiology, Yale University School of Medicine, CT, USA
(Supervisor; Prof. Alfred L.M. Bothwell)
Post-doctoral Fellow, August 2006-Feb 2007 Institute of Life Science & Biotechnology, Yonsei University, Seoul, Republic of Korea (Supervisor; Prof. Sang-Kyou Lee)
Papers
Intranasal delivery of the cytoplasmic domain of CTLA-4 using a novel protein transduction domain prevents allergic inflammation. (2006) Nat Med.외 40여편