相关实验视频
Updated: Aug 15, 2026

08:08
Measurement of Cytosolic Ca2+ in Isolated Contractile Lymphatics
Published on: December 8, 2011
概括
在康卡纳瓦林A刺激后,小鼠淋巴细胞循环AMP水平波动. 循环AMP的上升和下降对于启动DNA合成至关重要,影响淋巴细胞细胞循环的进展.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 淋巴细胞激活涉及复杂的信号通路.
- 氨酸3',5'-单酸盐 (循环AMP) 是细胞过程中的关键第二信使.
- 循环AMP动态在淋巴细胞增殖中的确切作用需要进一步阐明.
研究的目的:
- 研究循环AMP (cAMP) 波动在小鼠淋巴细胞激活和DNA合成中的作用.
- 为了确定cAMP变化的特定阶段是否是细胞周期进展所必需的.
主要方法:
- 用康卡纳瓦林A刺激了小鼠淋巴细胞.
- 循环AMP水平随着时间的推移而被测量.
- 印米他辛用于抑制循环AMP的增加.
- 用固酶抑制和8-环AMP添加来维持高水平的cAMP.
主要成果:
- 康卡纳瓦林A刺激诱导了淋巴细胞循环AMP水平的急剧上升和随后的下降,大约在刺激后10小时.
- 印梅他辛治疗可逆地阻断了循环AMP的增加和随后的DNA合成.
- 持续高的循环AMP水平,通过固酶抑制或8--循环AMP实现,也抑制了DNA合成.
- 循环AMP的升高和降低对于淋巴细胞进入S阶段至关重要.
结论:
- 循环AMP水平的动态变化,包括增加和减少,对于调节小鼠淋巴细胞进入S阶段至关重要.
- 循环AMP信号通路的调节可以显著影响淋巴细胞增殖.
- 这些发现强调了在细胞循环调节中精确的第二信使时间控制的重要性.
相关概念视频
Intracellular Signaling Cascades
Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...
Positive Regulator Molecules
To consistently produce healthy cells, the cell cycle—the process that generates daughter cells—must be precisely regulated.
Positive 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.
S-Cdk Initiates DNA Replication
The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.
Mitogens 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...
S-Cdk Initiates DNA Replication
The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.

