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Related Concept Videos

Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

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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G-protein Coupled Receptors

G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
G-protein Coupled Receptors01:21

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G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

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Intracellular Signaling Affects Focal Adhesions01:17

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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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G Protein-coupled Receptors01:15

G Protein-coupled Receptors

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A TIRF Microscopy Technique for Real-time, Simultaneous Imaging of the TCR and its Associated Signaling Proteins
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TRPC channels: integrators of multiple cellular signals.

J Soboloff1, M Spassova, T Hewavitharana

  • 1Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, 108 North Greene Street, Baltimore, MD 21201, USA.

Handbook of Experimental Pharmacology
|January 16, 2007
PubMed
Summary

Transient Receptor Potential Canonical (TRPC) channels integrate signals from phospholipase C (PLC)-coupled receptors. TRPC3 channels are regulated by inositol 1,4,5-trisphosphate (InsP3), diacylglycerol (DAG), and phosphatidylinositol 4,5-bisphosphate (PIP2) levels.

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Area of Science:

  • Molecular Biology
  • Cell Physiology
  • Ion Channel Function

Background:

  • TRPC channels are ubiquitously expressed and activated by phospholipase C (PLC)-coupled receptors.
  • PLC activation breaks down phosphatidylinositol 4,5-bisphosphate (PIP2) into inositol 1,4,5-trisphosphate (InsP3) and diacylglycerol (DAG).
  • TRPC channels mediate signals, including ion flux and membrane potential changes.

Purpose of the Study:

  • To elucidate the regulatory mechanisms of TRPC3 channels by PLC signaling pathways.
  • To investigate the roles of InsP3, DAG, and PIP2 in TRPC3 channel activation and modulation.
  • To understand how TRPC channels integrate diverse cellular signals.

Main Methods:

  • Analysis of TRPC channel activation in response to PLC pathway components.
  • Investigating the interaction between TRPC3, InsP3 receptors, and PIP2.
  • Studying the effects of DAG and protein kinase C (PKC) on TRPC3 channel activity.

Main Results:

  • TRPC3 channels are activated by store depletion induced by InsP3.
  • DAG directly activates TRPC3 channels in a non-PKC-dependent manner, but also leads to PKC-mediated deactivation.
  • TRPC3 channel interaction with PIP2 via a PH domain regulates its plasma membrane localization and function.
  • TRPC channels allow Na+ and Ca2+ influx, significantly altering membrane potential.

Conclusions:

  • TRPC3 channels are complex integrators of PLC-mediated signals, with distinct regulatory roles for InsP3, DAG, and PIP2.
  • The interplay between TRPC3, PLC pathway molecules, and membrane lipids fine-tunes channel activity and cellular responses.
  • TRPC channels are critical for signal transduction, ion homeostasis, and membrane potential regulation.