24p3とその受容体:新しい鉄器時代の幕開け?
1Children's Cancer Institute Australia for Medical Research, Iron Metabolism and Chelation Program, PO Box 81, High Street, Randwick, Sydney, New South Wales 2031, Australia. d.richardson@pathology.usyd.edu.au
Cell
|December 27, 2005
まとめ
タンパク質24p3は細菌の鉄と結合し,その受容体は鉄の吸収を制御する. 鉄と結合した24p3は白血球のアポトーシスを防止し,鉄のない24p3は細胞死を誘発する.
科学分野:
- 細胞生物学 細胞生物学
- 免疫学 免疫学とは
- タンパク質の生化学
背景:
- 24p3は白血球におけるアポトーシスを誘発する分泌タンパク質です.
- 24p3は,鉄を含む細菌のシデロフォールと結合し,鉄代謝や免疫防御における役割を示唆しています.
研究 の 目的:
- 24p3 内化に責任のある受容体を特定する.
- 細胞過程における鉄結合対無鉄24p3の異なる役割を解明する.
主な方法:
- タンパク質-リガンド結合測定法.
- ラベル24p3.3を使用した細胞吸収研究.
- アポトーシスアッセイ. アポトーシスアッセイ.
- ウエスタン・ブロッティングは,プロアポプトティックタンパク質を検出する.
主要な成果:
- 24p3の新しい受容体が特定されました.
- 鉄結合24p3の受容体による内部化は白血球におけるアポトーシスを防ぐ.
- apo-24p3 (無鉄) の内部化は,タンパク質Bim.によって媒介される細胞の鉄流出とアポトーシスを引き起こします.
結論:
- 24p3受容体は,細胞の鉄の恒常性およびアポトーシスの調節に重要な役割を果たします.
- 24p3の鉄結合能力は,細胞の生存または死に影響を及ぼす.
- この発見は,鉄代謝,先天性免疫,プログラム細胞死亡を結びつける新しいメカニズムを明らかにしています.
関連する概念動画
Intracellular Hormone Receptors
Lipid-soluble hormones diffuse across the plasma and nuclear membrane of target cells to bind to their specific intracellular receptors. These receptors act as transcription factors that regulate gene expression and protein synthesis in the target cell
Circadian Rhythms and Gene Regulation
The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent years,...
Regulation of the Unfolded Protein Response
Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
IP3/DAG Signaling Pathway
Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and produces two-second...
Transducer Mechanism: Nuclear Receptors
Nuclear receptors, or NRs, are unique transcription factors that regulate gene transcription and affect the cellular pathways involved in reproduction, development, or metabolism. Their ability to be stimulated by small lipophilic ligands and control vital cellular processes makes them ideal drug targets. Nearly 10-15% of currently prescribed drugs target these receptors.
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:
The Pineal Gland
The pineal gland, a diminutive endocrine structure named for its pinecone-shaped appearance, is situated atop the third ventricle within the diencephalon region of the forebrain. This gland, composed of secretory cells known as pinealocytes arranged in compact cords and clusters around dense particles of calcium salts, plays a pivotal role in hormonal regulation.
The primary secretion of the pineal gland is the hormone melatonin, derived from serotonin. The concentration of melatonin in the...
The primary secretion of the pineal gland is the hormone melatonin, derived from serotonin. The concentration of melatonin in the...


