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Related Concept Videos

Mitogens and the Cell Cycle02:38

Mitogens and the Cell Cycle

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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...
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Several external and internal factors influence the initiation and inhibition of cell division. For instance, the death of nearby cells or the release of human growth hormone (hGH) promotes cell division. In contrast, lack of hGH or crowding of cells can inhibit cell division.
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The cell cycle regulation directs how a cell proceeds from one phase to the next and begins mitosis. The cell cycle control system includes intracellular regulatory molecules and external triggers. They provide "stop" or "advance" signals and operate at specific cell cycle stages termed checkpoints to ensure that a particular process is completed before the cell advances to the next phase.
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Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
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Cell size is a significant factor impacting cellular design, function, and fitness. There exists some internal coordination by which cells double their masses before division, thus, achieving homeostasis. Coordination between cell growth and proliferation depends on the checkpoints in between cell cycle phases. Loss of coordination or failure in the checkpoint mechanism can drive the cell to uncontrolled growth and loss of cellular function. Like dividing cells that coordinate cellular growth,...
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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.
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Mitogen signaling strength and duration can control cell cycle decisions.

Ruth Nussinov1,2,3, Wengang Zhang3, Yonglan Liu3

  • 1Computational Structural Biology Section, Frederick National Laboratory for Cancer Research, Frederick, MD 21702, USA.

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Cell signaling duration and strength determine cell fate decisions like proliferation or differentiation. This study clarifies how varying mitogen signal patterns influence these critical cellular outcomes.

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Area of Science:

  • Cell Biology
  • Molecular Signaling
  • Cell Cycle Regulation

Background:

  • Cellular decisions to proliferate or differentiate are influenced by mitogen signaling duration and strength.
  • Early research highlighted mitogen signaling's role in the G1, S, and G2/M cell cycle phases.
  • The precise mechanisms by which signal dynamics control cell fate remain incompletely understood.

Purpose of the Study:

  • To investigate how fluctuating mitogenic signals are converted into cell proliferation and differentiation decisions.
  • To elucidate the reasons for the differential impact of weak, sustained signaling versus strong, short bursts.
  • To define signaling strength and clarify cell cycle decisions to ultimately understand cell fate.

Main Methods:

  • Utilizing a broad outlook integrating cell biology principles.
  • Employing protein conformational ensembles to analyze signaling dynamics.
  • Developing a framework to define signaling strength and cell cycle decision-making.

Main Results:

  • Extended duration of weak signaling promotes cell differentiation.
  • Short, strong mitogen signaling bursts induce proliferation.
  • Excessively strong and prolonged signaling leads to irreversible senescence.

Conclusions:

  • Signal duration and strength are critical, quantifiable parameters in cell fate determination.
  • Understanding these signaling dynamics provides insight into proliferation, differentiation, and senescence.
  • This work offers a novel perspective on how cells interpret and respond to mitogenic cues.