皮質細胞内在のIKK-β発現は腸内免疫ホメオスタシスを調節する
Colby Zaph1, Amy E Troy, Betsy C Taylor
1Department of Pathobiology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
Nature
|February 27, 2007
まとめ
腸内皮質細胞 (IECs) は免疫反応を調節する. IECに特異的なIKK-βの欠損はTヘルパー2細胞の免疫を低下させ,寄生虫感染中に重度の腸炎を引き起こします.
科学分野:
- 免疫学 免疫学とは
- 胃腸内科 胃腸内科
- 細胞生物学 細胞生物学
背景:
- 腸内皮質細胞 (IECs) は,消化管内の重要な障壁を形成しています.
- 感染に対する適応免疫を調節するIECの役割は,依然としてほとんど不明です.
研究 の 目的:
- IEC内在のイカッパBキナーゼ (IKK) -βが消化管内の免疫応答を調節する役割を調査する.
主な方法:
- IKK-βのIEC特異的なデリエーションを有するマウスを使用した.
- 寄生虫Trichuris. virusに感染した後の免疫反応を分析した.
- サイトカインの産生とT細胞の反応を評価した.
主要な成果:
- IECに特異的なIKK-βの消去により,胸膜のストロマルリンフォポイエチン発現が低下した.
- マウスは病原体に特異的なCD4+Tヘルパータイプ2 (T(H) 2) 応答を発達させることができず,トリチュリス感染をクリアできませんでした.
- IL-12/23p40,TNF-alpha,IFN-gamma,およびIL-17の過剰生産が観察され,重度の腸内炎症を引き起こしました.
結論:
- IECの内在的なIKK-βシグナル伝達は,消化管内のCD4+T細胞応答に不可欠である.
- IECは, dendritic 細胞の条件付けと,炎症性サイトカインの生産を制限する上で重要な役割を果たします.
- IECにおけるIKK-β依存遺伝子発現の維持は,腸内免疫ホメオスタシスのために不可欠であり,粘膜免疫を促進し,慢性炎症を予防します.
関連する概念動画
NF-κB-dependent Signaling Pathway
7.6K
The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
NF-κB-dependent Signaling Mechanism
The...
NF-κB-dependent Signaling Mechanism
The...
7.6K
Renewal of Intestinal Stem Cells
2.7K
The intestinal epithelial lining rapidly renews every 4 to 5 days. The renewal is facilitated by intestinal stem cells (ISCs) located at the base of the crypt– a gland located at the bottom of each villus. ISCs divide asymmetrically to form new stem cells and progenitor daughter cells. The daughter cells are called transit-amplifying (TA) cells which move upwards along the crypt and either differentiate into absorptive cells– the enterocytes or secretory cells– including the...
2.7K
Role of Ephrin-Eph Signalling in Intestinal Stem Cell Renewal
1.8K
Erythropoietin-producing hepatocellular carcinoma receptor (Eph) and its ligand, Eph receptor-interacting protein (Ephrin) were first discovered in the human carcinoma cell line, hence the name. Ephrin-Eph interaction guides cells to reach their appropriate location in adult tissues. They also play an essential role in the immune system by helping in immune cell migration, adhesion, and activation. Based on their structure and function, Eph is divided into two classes — EphA and EphB.
1.8K
Role Of Notch Signalling In Intestinal Stem Cell Renewal
1.8K
Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
1.8K
Inflammatory Bowel Disease II: Ulcerative Colitis
34
Ulcerative colitis is a chronic inflammatory disorder of the colon characterized by continuous mucosal inflammation that typically begins in the rectum and extends proximally in a uniform pattern. Its pathogenesis involves a complex interplay of genetic predisposition, immune dysregulation, and environmental influences. These factors converge to impair the colon’s epithelial defenses and promote an exaggerated inflammatory response against luminal contents.Breakdown of the Mucosal...
34
Inflammatory Bowel Disease III: Crohn's Disease
35
Crohn’s disease is a chronic, relapsing form of inflammatory bowel disease characterized by segmental, transmural inflammation that can affect any part of the gastrointestinal tract. Its pathogenesis arises from a combination of genetic susceptibility, environmental exposures, epithelial barrier dysfunction, and immune dysregulation. Together, these factors lead to an exaggerated immune response against components of the gut microbiome.Genetic and Environmental InfluencesMultiple genetic...
35


