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Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of...
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G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
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G Protein–Coupled Receptors (GPCRs) are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to various stimuli. GPCRs regulate critical physiological pathways and are excellent drug targets for treating diseases such as diabetes, cancer, obesity, depression, or Alzheimer's. Nearly 35% of approved drugs implement their therapeutic effects by selectively interacting with specific GPCRs.
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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.
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G-Protein Gated Ion Channels01:21

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GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory...
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G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...
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Detection and Quantification of Calcitonin Gene-Related Peptide CGRP in Human Plasma Using a Modified Enzyme-Linked Immunosorbent Assay
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Detection and Quantification of Calcitonin Gene-Related Peptide CGRP in Human Plasma Using a Modified Enzyme-Linked Immunosorbent Assay

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CGRP and its receptors.

Debbie L Hay1, Christopher S Walker1

  • 1School of Biological Sciences, The University of Auckland, Auckland, New Zealand.

Headache
|February 25, 2017
PubMed
Summary
This summary is machine-generated.

Calcitonin gene-related peptide (CGRP) may activate multiple receptors beyond the traditional CGRP receptor. This finding impacts migraine treatment development by suggesting new therapeutic targets.

Keywords:
CGRPamylinmigrainereceptor activity-modifying protein

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Area of Science:

  • Neuroscience
  • Pharmacology

Background:

  • The calcitonin gene-related peptide (CGRP) neuropeptide system is a key target for migraine therapeutics.
  • Understanding CGRP receptor identity is crucial for migraine drug safety and efficacy.
  • Historically, the calcitonin receptor-like receptor/receptor activity-modifying protein 1 (RAMP1) complex has been considered the primary CGRP receptor.

Purpose of the Study:

  • To explore the potential for CGRP to activate multiple endogenous receptors.
  • To consider the implications of newly identified CGRP-responsive receptors in the trigeminovascular system for migraine pathophysiology and treatment.
  • To re-evaluate the molecular identity of CGRP receptors involved in migraine.

Main Methods:

  • Literature review and perspective synthesis.
  • Analysis of recent findings on CGRP receptor identification.
  • Consideration of the functional implications of CGRP receptor diversity.

Main Results:

  • CGRP has the potential to activate multiple receptor types, not solely the CLR/RAMP1 complex.
  • The calcitonin receptor/RAMP1 complex (AMY1 receptor) has been identified as CGRP-responsive within the trigeminovascular system.
  • This suggests a broader range of CGRP receptor interactions than previously assumed.

Conclusions:

  • The established view of CGRP receptor identity in migraine may be incomplete.
  • The discovery of additional CGRP-responsive receptors necessitates a re-evaluation of migraine treatment strategies.
  • Further research into CGRP receptor diversity is essential for advancing migraine therapy.