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完整後設資料紀錄
DC 欄位值語言
dc.contributor.advisor于宏燦(Hon-Tsen Yu)
dc.contributor.authorChia-Min Liaoen
dc.contributor.author廖家敏zh_TW
dc.date.accessioned2021-06-17T00:45:34Z-
dc.date.available2013-02-08
dc.date.copyright2012-02-08
dc.date.issued2012
dc.date.submitted2012-01-05
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dc.identifier.urihttp://tdr.lib.ntu.edu.tw/jspui/handle/123456789/66600-
dc.description.abstractCD1d分子限制型自然殺手T細胞(Natural killer T cells)為一群具有免疫調節功能的細胞。依照T細胞受體(T-cell receptor)的基因表現,此類細胞可歸於於兩大類:第一類與第二類CD1分子限制型自然殺手T細胞。第一類CD1d分子限制型自然殺手T細胞表達固定的T細胞受體,並且可以四聚體(GalCer/CD1d)檢測。反之,第二類CD1d分子限制型自然殺手T細胞表達多樣的T細胞受體,而目前為止並無專一的方法偵測此類細胞。有別於傳統的T細胞, 第一類CD1d分子限制型自然殺手T細胞的生長發育是由 CD1d表達的造血幹細胞負責。此外,淋巴細胞訊息活化分子(SAP)也被證明是對第一類CD1d分子限制型自然殺手T細胞的生長發育與功能有重要的調節作用。以目前的研究發展和規範,多針對第一類CD1d分子限制型自然殺手T細胞有所了解,而對第二類的CD1d分子限制型自然殺手T細胞的生長發育機制與其在臨床疾病上所扮演的角色所之甚少。第一類CD1d分子限制型自然殺手T細胞在自發性腸炎的小鼠模型中具有複雜的角色,而臨床研究中在潰瘍性結腸炎腸道炎症的病患中發現第二類CD1d分子限制型自然殺手T細胞似乎具有更重要的影響力。因此,本研究利用轉基因小鼠(24αβTg)來探討第二類的CD1d分子限制型自然殺手T細胞的生長發育。利用骨髓轉移的技術,我證明了第二類的CD1d分子限制型自然殺手T細胞的生長發育亦是由CD1d表達的造血幹細胞負責。由於此兩類細胞具有相似的生長選擇機制,我更進一步研究淋巴細胞訊息活化分子是否對第二類CD1d分子限制型自然殺手T細胞也有所影響。藉由雜交轉基因小鼠至淋巴細胞訊息活化分子缺陷型小鼠中,我觀察到第二類的CD1d分子限制型自然殺手T細胞具有不成熟的表型,及受損的細胞分子 IFN-γ 和 IL-4表現。而此細胞因子的缺失更與轉錄因子T-bet和Eomes有顯著的相關。此外,為了探討第二類的CD1d分子限制型自然殺手T細胞和過量表達CD1d分子所引起的失衡是否會對此細胞的生長發育造成影響,亦或會導致自發性腸炎。我便雜交轉基因小鼠與CD1d分子過量表達的小鼠。在此雙重轉基因的小鼠中,我觀察到第二類的CD1d分子限制型自然殺手T細胞的數量減少。此項結果證明了過量表達自身抗原或自配體,如CD1d分子,會引起胸腺負選擇機制並導致第二類的CD1d分子限制型自然殺手T細胞的計畫性死亡。利用轉移細胞到免疫缺陷型小鼠的方法,我更進一步直接證明了第二類的CD1d分子限制型自然殺手T細胞在CD1d分子過量表達的背景下發展出的致病性。總體來說,本研究首次證明了第二類CD1d分子限制型自然殺手T細胞的生長發育是由CD1d表達的造血幹細胞負責,並提供了淋巴細胞訊息活化分子在調節此類細胞的正長生長發育與成熟表型的證據。此外,此研究並證明了異常的第二類CD1d分子限制型自然殺手T細胞反應會導致自發性腸炎,更突顯出了CD1d的表達水平與第二類CD1d分子限制型自然殺手T細胞的發展和其在免疫系統中的重要性。zh_TW
dc.description.abstractCD1d-restricted NKT cells are a unique subset of immunoregulatory T cells
further divided into two subtypes. Type I NKT cells express semi-invariant TCR and can be detected using α-GalCer/CD1d tetramer, whereas type II NKT cells express diverse TCR and cannot be directly identified. The developmental requirements and molecular mechanisms that regulate type I NKT cells are distinct from those of conventional T cells. CD1d-expressing hematopoietic cells are shown to be required for mediating the positive selection of type I NKT cells. In addition, signaling lymphocytic activation molecule-associated protein (SAP) is an adaptor molecular which has also been shown to be important for the development and function of type I NKT cells. Unlike type I NKT cells which have been well investigated, studies of the development and mechanisms of which regulate type II NKT cells are poorly understood. Furthermore, clinical studies on several mouse models of inflammatory bowel disease (IBD) have revealed a complex role for type I NKT cells in the development of IBD while type II NKT cells appear to contribute to intestinal inflammation in individuals suffering from ulcerative colitis. In this study, I used a TCR transgenic mouse model (24αβTg) to study a dominant type II NKT cell population. I demonstrate that the CD1d-expressing hematopoietic cells meditate the efficient selection of type II NKT using bone marrow chimeras. Given the similar developmental requirements sharing between type I NKT and type II NKT cells, I sought to address whether SAP is also required for the development and function of type II NKT cells. Therefore, I generated 24αβTg/SAP-/- mice and observed that type II NKT cells have an immature phenotype and impaired cytokine IFN-γ and IL-4 production in the thymus. The reduction of IFN-γ in type II NKT cells is correlated with a significantly reduced expression of T-bet and Eomes transcription factor. Furthermore, to address whether the dysregulation of type II NKT cells caused by increased CD1d expression can contribute to the pathogenesis of IBD, I crossed 24αβTg mice with CD1Tg mice that express higher levels of CD1d in all cell types. In CD1dTg/24αβTg mice, I observed reduced 24αβT cell numbers, suggesting that type II NKT cells undergo enhanced negative selection when engaged by abundant self-antigen or self-ligands. Additionally, the residual 24αβT cells in CD1dTg/24αβTg mice exhibited an altered surface phenotype and acquired a cytokine profile distinct from that of equivalent cells in 24αβTg mice. Interestingly, CD1dTg/24αβTg mice spontaneously developed IBD and adoptive transfer experiments confirmed that type II NKT cells that develop in the context of increased CD1d expression are pathogenic. Collectively, these findings comprise the first evidence of the CD1d-expressing hematopoietic cells in mediating the selection of type II NKT cells and reveal the pivotal role of SAP in regulating the normal development and mature phenotype and function of type II NKT cells. In addition, I have demonstrated that aberrant type II NKT cell responses directly contribute to intestinal inflammation, highlighting the importance of CD1d expression level in the development and regulation of type II NKT cells.
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dc.description.tableofcontents目錄
TABLE OF CONTENTS
口試委員會審定書 i
誌謝 (ACKNOWLEDGEMENTS) ii
中文摘要 iii
英文摘要 (ABSTRACT) v
CHAPTERS:
1. INTRODUCTION 1
1.1. MHC class Ia and Ib molecules 1
1.2. The CD1 gene family 3
1.3. Trafficking and expression of CD1 molecule 4
1.4. CD1d-restricted natural killer T (NKT) cells 5
1.5. Ligands for CD1d molecules 7
1.6. Development and selection of CD1d-restricted NKT cells 9
1.7. Signaling molecules required for the development of NKT cells 11
1.8. The functional properties and regulation of NKT cells 16
1.9. NKT cells in immunity 18
1.10. CD1d expression and NKT cell population in the intestinal mucosa 18
1.11. CD1 and NKT cells in the intestinal inflammation 20
1.12. Rationale and experimental approach 24
2. MATERIALS AND METHODS 27
2.1. Materials 27
2.1.1. Mouse strains 27
2.1.2. Antibodies 27
2.1.3. Tissue culture media 28
2.1.4. Flow cytometry 28
2.2. Methods 29
2.2.1. Genotyping 29
2.2.2. Single cell suspension and flow cytometric analysis 29
2.2.3. Bone marrow adoptive transfer 30
2.2.4. Intracellular staining 30
2.2.5. Proliferation assay 31
2.2.6. ELISA 32
2.2.7. Cytokine Bead Assay (CBA) and Flex set cytokine kit assay 32
2.2.8. Histology 33
2.2.9. MACS magnetic bead cell enrichment and cell sorting 34
2.2.10. Statistical analysis 34
3. THE DEVELOPMENTAL REQUIREMENTS AND ADAPTOR MOLECULE
SIGNALING LYMPHOCYTIC ACTIVATION MOLECULE-ASSOCIATED
PROTEIN (SAP) IN THE REGULATION OF CD1D-RESTRICTED TYPE II NKT
CELLS 35
3.1. Introduction 35
3.2. Results 37
3.2.1. The development of CD1d-restricted type II NKT cells is CD1d dependent 37
3.2.2. MHC-class Ia molecules cannot mediate the development of type II NKT
cells 39
3.2.3. Type II NKT cells express PLZF 41
3.2.4. CD1d-expressing hematopoietic cells mediate the positive selection of type II NKT cells 43
3.2.5. Multiple CD1d-expressing hematopoietic cell types are capable of mediating
the positive selection of type II NKT cells 45
3.2.6. The development of CD1d-restricted type II NKT cells in the 24αβTg/SAP-/-
mice 47
3.2.7. Type II NKT cells in 24αβTg/SAP-/- mice express an altered cell surface
phenotype 51
3.2.8. Type II NKT cells in 24αβTg/SAP-/- exhibit impaired cytokine secretion 57
3.3. Discussion 63
4. DYSREGULATION OF CD1D-RESTRICTED TYPE II NKT CELLS LEADS TO SPONTANEOUS DEVELOPMENT OF INFLAMMATORY BOWEL DISEASE (IBD) IN MICE 68
4.1. Introduction 68
4.2. Results 70
4.2.1. 24αβ T cells exhibit enhanced proliferation in the presence of high CD1d
expression in vivo 70
4.2.2. CD1d expression program modulates the development and function of CD1d-
restricted type II NKT cells 72
4.2.3. Ontogeny of 24αβ T cells in 24αβTg and Kb-CD1dTg/24αβTg mice 74
4.2.4. Comparable proliferation efficiency of type II NKT cells is observed in
24αβTg and Kb-CD1dTg/24αβTg mice 76
4.2.5. Increased CD1d expression leads to enhanced negative selection of type II
NKT cells in Kb-CD1dTg/24αβTg mice 78
4.2.6. The surface phenotype and functional properties of 24αβ T cells are altered in Kb-CD1dTg/24αβTg mice 80
4.2.7. Kb-CD1dTg/24αβTg mice spontaneously develop IBD 84
4.2.8. 24αβ T cells that develop in the Kb-CD1dTg background are pathogenic and
can directly cause colitis 88
4.2.9. Cell type specific CD1d expression and its role in mediating the development
and function of type II NKT cells 94
4.3. Discussion 99
5. IMPLICATIONS AND FUTURE DIRECTIONS 109
5.1. CD1d expression level and signaling mechanism regulate the development and
immune response of type II NKT cells 109
5.1.1. The role of CD1d expression in mediating the development of 24αβ T cells
that possess an NKT cell phenotype 109
5.1.2. Is the SLAM pathway required for the development of 24αβ T cells? 110
5.1.3. Role of type II NKT cells in the viral infection of 24αβTg/SAP-/-mice 112
5.2. Further investigate the physiological role of type II NKT cells in the pathogenesis of IBD 114
5.2.1. Immunohistochemistry (IHC) of various infiltrated cell types in the colon of
Kb-CD1dTg/24αβTg mice and Lck-CD1dTg/24αβTg mice 115
5.2.2. Direct evidence of the pathogenic role of 24αβ T cells from Lck-CD1dTg/
24αβTg mice 117
5.2.3. Anergy of 24αβ T cells in 24αβTg/RAG-/- and Kb-CD1dTg/24αβTg/RAG-/-
mice 118
5.2.4. Microflora homeostasis in antibiotic treated Kb-CD1dTg/24αβTg mice 119
5.2.5. Investigating the role of polyclonal type II NKT cells in the pathogenesis of
IBD using adoptive transfer 120
5.3. The phenotype and function of type I NKT cells that develop in a background
involving CD1d-over expression and excess type I NKT cells 121
5.3.1. Overexpression of CD1d combined with high abundance of type I NKT cells
does not result in IBD, unlike type II NKT cells 121
5.3.2. Altered TCR usage among type I NKT cells is observed in Kb-CD1dTg/
Vα14Tg mice 122
5.4. Proposed model 123
5.5. Concluding remarks 126
6. REFERENCE 127
dc.language.isoen
dc.subjectCD1dzh_TW
dc.subject自發性腸炎zh_TW
dc.subject自然殺手細胞zh_TW
dc.subjectNKT cellsen
dc.subjectIBDen
dc.subjectCD1den
dc.title第二類CD1d分子限制型自然殺手細胞的生長發育機制及其導致自體免疫性腸炎的探討zh_TW
dc.titleTHE DEVELOPMENTAL REQUIREMENTS AND FUNCTIONS OF CD1D-RESTRICTED TYPE II NATURAL KILLER T (NKT) CELLS AND THEIR ROLES IN THE PATHOGENESIS OF INFLAMMATORY BOWEL DISEASEen
dc.typeThesis
dc.date.schoolyear100-1
dc.description.degree博士
dc.contributor.coadvisor王瓊如(Chyung-Ru Wang)
dc.contributor.oralexamcommittee羅竹芳(Chu-Fang Lo),黃曉薇(Shiao-Wei Huang),王涵青(Han-Ching Wang)
dc.subject.keyword自然殺手細胞,自發性腸炎,CD1d,zh_TW
dc.subject.keywordNKT cells,IBD,CD1d,en
dc.relation.page143
dc.rights.note有償授權
dc.date.accepted2012-01-05
dc.contributor.author-college生命科學院zh_TW
dc.contributor.author-dept動物學研究所zh_TW
顯示於系所單位:動物學研究所

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