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Related Concept Videos

Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

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Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
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Diversity in Cell Signaling Responses01:22

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The physiological function of a cell and cellular communication are outcomes of a range of extrinsic signals, intracellular signaling pathways, and cellular responses. No two cell types express the same repertoire of signaling components. Receptors are highly selective for their cognate ligands, but once activated, they can alter multiple cellular processes such as DNA transcription, protein synthesis, and metabolic activity. 
Graded and Abrupt Responses
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Notch Signaling Pathway03:14

Notch Signaling Pathway

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The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
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Amplifying Signals via Enzymatic Cascade01:22

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When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze...
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Cell Signaling Feedback Loops01:07

Cell Signaling Feedback Loops

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Positive and negative feedback loops are crucial for regulating biological signaling systems. These feedback loops are processes that connect output signals to their inputs.
Negative feedback loops
Most signaling systems have negative feedback loops that can perform different functions such as output limiter, and adaptation.
Output limiter
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The Cell Cycle Control System01:28

The Cell Cycle Control System

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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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Related Experiment Video

Updated: Feb 24, 2026

Studying Cell Cycle-regulated Gene Expression by Two Complementary Cell Synchronization Protocols
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[Basic principles: signaling pathways and checkpoints].

M Preusser1

  • 1Universitätsklinik für Innere Medizin I, Comprehensive Cancer Center, Medizinische Universität Wien, Währinger Gürtel 18-20, 1090, Wien, Österreich. matthias.preusser@meduniwien.ac.at.

Der Radiologe
|August 16, 2017
PubMed
Summary
This summary is machine-generated.

Immune checkpoint inhibitors are effective cancer treatments with good tolerability. This review explains their mechanism, clinical use, response patterns, and side effects for oncologists.

Keywords:
CTLA4CancerImmune checkpointPD-1PD-L1

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Area of Science:

  • Oncology
  • Immunology

Background:

  • Immune checkpoint inhibitors (ICIs) demonstrate significant antitumor activity and favorable tolerability across various cancer types.
  • ICIs have become a standard in oncological practice.

Purpose of the Study:

  • To summarize the mechanism of action of immune checkpoint inhibitors.
  • To provide a foundation for understanding their clinical efficacy, radiological response patterns, and adverse event profiles.

Main Methods:

  • Literature review of immune checkpoint inhibitor mechanisms and clinical applications.
  • Synthesis of information regarding clinical activity, radiological assessment, and safety.

Main Results:

  • ICIs modulate the immune system to enhance anti-tumor responses.
  • Understanding their action is crucial for interpreting clinical and radiological outcomes.
  • Common adverse events associated with ICI therapy are discussed.

Conclusions:

  • Immune checkpoint inhibitors represent a significant advancement in cancer therapy.
  • A comprehensive understanding of their mode of action aids in optimizing patient care and managing side effects.