まとめ
コンカナバリンAを刺激したリンパ球はチミジンを分解する. ティミジンを分解する酵素の活動は,細胞分裂中に高いが,S段階では著しく低下し,分解がティミジンのプールを調節することを示唆している.
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
背景:
- コンカナヴァリンAで刺激されたリンパ球は,特定の代謝活動を示す.
- ティミジンの代謝は,DNA合成と細胞サイクル進行において重要な役割を果たします.
研究 の 目的:
- 刺激されたリンパ球におけるチミジンの分解経路を調査する.
- 細胞サイクルを通してチミジンを分解する酵素の活性パターンを決定する.
主な方法:
- 酵素活性アッセイは,コンカナヴァリンAで刺激されたリンパ球で実施されました.
- ベータ-アミノイオバートリック酸を含むチミジン分解産物の分析.
主要な成果:
- コンカナヴァリンAを刺激したリンパ球は,チミジンをベータ-アミノイノス脂肪酸に分解する.
- Thymidine-catabolizing酵素の活動は,G1,G2,およびミトーシス中に上昇しています.
- 酵素活性は,細胞サイクルS相前およびその間,著しく低下する.
結論:
- 細胞の分解は,チミジンプールを調節する重要なメカニズムです.
- 細胞周期に依存するチミジンを分解する酵素の調節は,DNA合成のためのチミジンの利用可能性に影響します.
さらに関連する動画
08:13Rapid Quantification of Mitogen-induced Blastogenesis in T Lymphocytes for Identifying Immunomodulatory Drugs
Published on: December 27, 2016
08:33Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis
Published on: December 5, 2017
関連する概念動画
01:45Positive Regulator Molecules
To consistently produce healthy cells, the cell cycle—the process that generates daughter cells—must be precisely regulated.
02:39Positive Regulator Molecules
Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
02:34Inhibition of Cdk Activity
The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
02:38Mitogens and the Cell Cycle
Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
00:50Anaphase Promoting Complex
The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
01:28Biosynthesis of Nucleic Acids
Nucleic acid biosynthesis is a fundamental biochemical process that produces the purine and pyrimidine nucleotides essential for DNA and RNA synthesis. This pathway maintains a balanced nucleotide pool, preventing imbalances that could jeopardize genetic integrity and cellular function. Given the crucial role of nucleotides, their synthesis is tightly regulated to ensure proper cellular homeostasis.Purine BiosynthesisThe biosynthesis of purine nucleotides begins with ribose-5-phosphate, a...