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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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Because many receptor binding ligands are hydrophilic, they do not cross the cell membrane and thus their message must be relayed to a second messenger on the inside. There are several second messenger pathways, each with their own way of relaying information. G-protein coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol path is active when the receptor induces phospholipase C to hydrolyze the phospholipid,...
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Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
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Hormones—or any molecule that binds to a receptor, known as a ligand—that are lipid-insoluble (water-soluble) are not able to diffuse across the cell membrane. In order to be able to affect a cell without entering it, these hormones bind to receptors on the cell membrane. When a first messenger, a hormone, binds to a receptor, a signal cascade is set off, causing second messengers, proteins inside the cell, to become activated, resulting in downstream effects.
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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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Water-soluble hormones cannot cross the plasma membrane, so they rely on protein receptors that span the membrane to trigger intracellular signaling pathways. These pathways then activate second messengers inside the cell, including cAMP or calcium ions.
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[Signal transmission using second messengers].

C Pfister1

  • 1Centre d'études nucléaires de Grenoble, biophysique moléculaire et cellulaire, France.

Reproduction, Nutrition, Development
|January 1, 1989
PubMed
Summary
This summary is machine-generated.

Cellular communication relies on signal molecules interacting with receptors, triggering cascades that alter cell function. This review explores these molecular interactions using hormonal systems and vision as key examples.

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Area of Science:

  • Cellular Biology
  • Molecular Signaling
  • Biochemistry

Background:

  • Intercellular communication is vital for multicellular organisms, utilizing signal molecules like hormones and neurotransmitters.
  • A common signaling pathway involves membrane receptors, G-proteins, effectors, and second messengers (e.g., cAMP, Ca++).

Purpose of the Study:

  • To elucidate the molecular mechanisms of signal transduction.
  • To illustrate the interactions within enzymatic cascades using established biological systems.

Main Methods:

  • Review of existing literature on cellular signaling pathways.
  • Analysis of molecular actors in signal transduction cascades.
  • Case studies of hormonal systems and vertebrate rod outer segment phototransduction.

Main Results:

  • Detailed description of the components involved in signal transduction: receptors, G-proteins, effectors, and second messengers.
  • Explanation of how these components interact to mediate cellular responses.
  • Highlighting the conserved nature of these pathways across different biological processes.

Conclusions:

  • The described mechanism provides a fundamental framework for understanding how cells communicate and respond to external stimuli.
  • Hormonal regulation and visual perception exemplify the complexity and efficiency of these signal transduction pathways.