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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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Signal Transduction: Overview01:26

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Cells respond to many types of information, often through receptor proteins positioned on the membrane. They respond to chemical signals, such as hormones, neurotransmitters, and other signaling molecules, initiating a series of molecular reactions to produce an appropriate response. This is called signal transduction. Cells also coordinate different responses elicited by the same signaling molecule via mediators, allowing molecular cross-talk.
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Amplifying Signals via Second Messengers01:15

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Many receptor binding ligands are hydrophilic; they do not cross the cell membrane but bind to cell-surface receptors. Thus, their message must be relayed by second messengers present in the cell cytoplasm. There are several second messenger pathways, each with its own way of relaying information. For example, the G protein-coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol pathway is active when the receptor induces...
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TGF - β Signaling Pathway01:16

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The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors...
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Intracellular Signaling Cascades01:24

Intracellular Signaling Cascades

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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...
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Related Experiment Video

Updated: Apr 22, 2026

Screening Bioactive Nanoparticles in Phagocytic Immune Cells for Inhibitors of Toll-like Receptor Signaling
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Toll-like receptor signaling pathways.

Takumi Kawasaki1, Taro Kawai1

  • 1Laboratory of Molecular Immunobiology, Graduate School of Biological Sciences, Nara Institute of Science and Technology , Ikoma , Japan.

Frontiers in Immunology
|October 14, 2014
PubMed
Summary

Toll-like receptors (TLRs) are key to innate immunity, recognizing microbes and activating immune responses. Recent studies clarify TLR signaling pathways and their role in host defense against pathogens.

Keywords:
IRFsNF-κBTLRsadaptorssignal transduction

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Area of Science:

  • Immunology
  • Molecular Biology

Background:

  • Toll-like receptors (TLRs) are critical components of the innate immune system.
  • They recognize pathogen-associated molecular patterns (PAMPs) from microbes.
  • TLR activation initiates signaling cascades involving adaptor molecules and transcription factors like NF-κB and IRFs.

Purpose of the Study:

  • To review recent advancements in understanding TLR signaling regulation.
  • To highlight the role of TLRs in host defense mechanisms against pathogens.

Main Methods:

  • This review synthesizes findings from genetic, biochemical, structural, cell biological, and bioinformatics studies.
  • It focuses on the clarification of precise mechanisms underlying TLR signaling.

Main Results:

  • TLR signaling pathways are complex and divergent.
  • These pathways play significant roles in innate immune responses to various pathogens.
  • Recent research has elucidated key regulatory mechanisms.

Conclusions:

  • A deeper understanding of TLR signaling regulation is crucial for comprehending host defense.
  • Continued research into TLRs offers potential for therapeutic strategies against infectious diseases.