GSタンパク質のアルファサブユニット配列に対するアンチセンセスのオリゴデオキシヌクレオチドは,線維芽細胞の分化を加速してアディポサイトに変化させます
H Y Wang1, D C Watkins, C C Malbon
1Department of Biochemistry, National Defense Medical Center, Taipei, Taiwan, Republic of China.
Nature
|July 23, 1992
まとめ
コレラ毒素は,Gsααを活性化することによって,3T3-L1線維芽細胞の脂肪細胞への分化を阻害する. Gsαを標的にするアンチセンセスのオリゴデオキシヌクレオチドは,この分化を加速し,循環型AMPから独立したGsαの新たな役割を明らかにする.
科学分野:
- 細胞生物学 細胞生物学
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
背景:
- 3T3-L1線維芽細胞は脂肪細胞に微分化し,脂質を蓄積する.
- Gタンパク質は,トランスメブランシグナル伝達に不可欠であり,自己調節されます.
- 3T3-L1アディポゲネシス中にGタンパク質濃度が大きく変化する.
研究 の 目的:
- 3T3-L1線維芽細胞の分化におけるGタンパク質,特にGsαの役割を調査する.
- Gsアルファの活性がアディポゲネシスの速度とプロセスに影響するかどうかを判断する.
主な方法:
- 3T3-L1細胞をコレラ毒素で治療して,Gsααを活性化する.
- Gsααを標的とした反感覚オリゴデオキシヌクレオチドの投与.
- 脂質の蓄積と分化時間の経過を監視する.
主要な成果:
- コレラ毒素はアディポサイトの分化を阻害した.
- Antisense Gsアルファオリゴデオキシヌクレオチドは分化を著しく加速し,時間経過を7〜10日から約3日まで短縮しました.
- 百日咳毒素,フォルスコリン,またはディブチリルcAMPは分化に影響を与えず,Gsαの役割はcAMPから独立していることを示唆しています.
結論:
- Gsアルファ活動は,3T3-L1アディポゲネシスを調節する上で重要な新しい役割を果たします.
- Gsαによるこの調節は,細胞内循環型AMPレベルの変化とは無関係です.
関連する概念動画
02:11Proteins: From Genes to Degradation
Within a biological system, the DNA encodes the RNA, and the nucleotide sequence in the RNA further defines the amino acid sequence in the protein. This is referred to as “The Central Dogma of Molecular Biology” - a term coined by Francis Crick. Central dogma is a firm principle in biology that defines the flow of genetic information within any life form. The two fundamental steps in central dogma are - transcription and translation.
Transcription is the synthesis of RNA molecules by RNA...
Transcription is the synthesis of RNA molecules by RNA...
01:24Oligosaccharide Assembly
Protein glycosylation starts in the ER lumen and continues in the Golgi apparatus. Glycosyltransferases catalyze the addition of sugar molecules or glycosylation of proteins. Usually, these enzymes add sugars to the hydroxyl groups of selected serine or threonine residues to form O-linked glycans or the amino groups of asparagine residues to form N-linked glycans. Different positions on the same polypeptide chain can contain differently linked glycans.
Multiple sugar molecules that may or may...
Multiple sugar molecules that may or may...
01:26Protein Modifications in the RER
Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal sequences.
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal sequences.
01:29Protein Folding Quality Check in the RER
ER is the primary site for the maturation and folding of soluble and transmembrane secretory proteins. The calnexin cycle is a specific chaperone system that folds and assesses the confirmation of N-glycosylated proteins before they can exit the ER lumen. The primary players of this quality check pipeline are the lectins, ER-resident chaperones, and a glucosyl transferase enzyme. In case the calnexin system in the lumen fails to salvage a misfolded protein, it is transported to the cytoplasm...
01:23Stringent Response in E. coli
Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...