関連する実験動画
Updated: Jul 13, 2026

08:26
Saturated Fatty Acids Induce Ceramide-associated Macrophage Cell Death
Published on: October 31, 2017
BADのカルシネウリン脱酸化によるCa2+誘発のアポトーシス
H G Wang1, N Pathan, I M Ethell
1The Burnham Institute, 10901 North Torrey Pines Road, La Jolla, CA 92037, USA.
まとめ
カルシウム活性化タンパク質フォスファタゼカルシネウリンは,プロアポプトシスタンパク質BADをデフォスフォリル化することによってアポプトシスを引き起こす. これにより,BADになる.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- 神経科学は神経科学である.
背景:
- カルシヌーリンは,カルシウム活性化タンパク質フォスファタゼであり,アポプトシスを誘発することが知られている.
- カルシネウリンがプログラム細胞死を促す正確な分子機構は,依然としてほとんど解明されていない.
研究 の 目的:
- アポトーシス誘導におけるカルシヌーリンの役割を調査する.
- アポトーシス中にカルシヌーリンによって調節される下流ターゲットとメカニズムを特定する.
主な方法:
- タンパク質の脱リン酸化と異体化化を評価するための生化学的測定法.
- タンパク質の転位を追跡するために顕微鏡を用いた細胞の局所化研究.
- L-グルタミン酸刺激を含む海馬の神経細胞での実験.
- 主要負カルシヌーリンの変異体と薬理学的阻害剤を用いた抑制研究.
主要な成果:
- カルシヌーリンは,Bcl-2ファミリーのメンバーであるプロアポプトティックタンパク質BADを脱酸化します.
- デフォスフォリレーションは,Bcl-xLとのBADの異体化を促進し,アポトーシスを促進します.
- カルシウム誘発のBAD脱酸化は,14-3-3タンパク質からの解離とミトコンドリアへの転位を引き起こす.
- 海馬の神経細胞では,L-グルタミン酸はBADミトコンドリア標的とアポトーシスを誘発し,それらはカルシヌーリンの阻害によってブロックされます.
結論:
- アポトーシス誘導のための新しいカルシウム誘導経路は,BAD酸化のカルシヌーリン媒介調節を含む.
- カルシヌーリンは,BADの酸化状態を変えることでBADの局所化を制御し,ミトコンドリアに依存した細胞死につながります.
- このメカニズムは,ニューロンのアポトーシスにおけるカルシヌーリンの重要な役割を強調しています.
関連する概念動画
Factors Affecting Solubility
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
Loss of Carboxy Group as CO2: Decarboxylation of β-Ketoacids
Carboxylic acids, upon heating, undergo a decarboxylation reaction by releasing carbon dioxide gas. Monocarboxylic acids do not undergo decarboxylation easily. However, a silver salt of carboxylic acid reacts with bromine or iodine under high temperature to release carbon dioxide gas and forms halide with one less carbon. This reaction is called the Hunsdiecker reaction.
Necrosis
Necrosis is considered as an “accidental” or unexpected form of cell death that ends in cell lysis. The first noticeable mention of “necrosis” was in 1859 when Rudolf Virchow used this term to describe advanced tissue breakdown in his compilation titled “Cell Pathology”.
Morphological Manifestations of Necrosis
Necrotic cells show different types of morphological appearance depending on the type of tissue and infection. In coagulative necrosis, cells become anucleated and die, but their...
Morphological Manifestations of Necrosis
Necrotic cells show different types of morphological appearance depending on the type of tissue and infection. In coagulative necrosis, cells become anucleated and die, but their...
Protein Denaturation
The function of proteins depends on their native three-dimensional structure, which is dictated by the amino acid sequence of the specific protein. Folding of the polypeptide chain takes place under specific conditions that energetically favor the folded conformation. In contrast, protein denaturation occurs spontaneously under unfavorable conditions that disrupt the integrity of the folded conformation. Thus, the chemical and physical environment of a protein, such as significant changes in pH...
Amino Acid Catabolism
Microorganisms rely on proteins as an essential carbon and energy source, particularly in environments with limited polysaccharides or lipids. However, proteins are too large to cross the plasma membrane unaided, necessitating enzymatic degradation. Microbes secrete extracellular proteases and peptidases that hydrolyze proteins into peptides, which can then be transported across the membrane. Once inside the cell, intracellular proteases degrade these peptides into free amino acids, which...
Cellular Injury IV: Necrosis
Necrosis is a form of irreversible cell death caused by severe injury such as ischemia, toxins, or trauma. Unlike programmed cell death, it is an uncontrolled, pathological process that typically provokes inflammation in surrounding tissues.Pathophysiologic ChangesNecrosis begins when cells sustain critical damage, leading to swelling of organelles, particularly mitochondria, and rapid ATP depletion. As energy levels decline, membrane ion pumps fail, leading to calcium influx and eventually,...

