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DREADDs for studying GPCR signaling

 DREADD research tools
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GPCRs can be modified so that they only respond to a specific biologically inert chemical (a designer drug). These modified GPCRs are called Designer Receptors Exclusively Activated by Designer Drugs or “DREADDs”. Cells expressing the DREADD respond robustly to low concentrations of the designer molecule, whereas cells that do not express DREADD are unresponsive to the designer drug. DREADDs are functionally similar to their wild type receptors, therefore they are exciting tools for the study of GPCR signaling.

What are the advantages of DREADDs?

  • You can selectively control different signaling pathways in neurons: depending on the DREADD you choose, you can precisely control Gq, Gi or Gs-signaling pathways.
  • DREADDs and the designer drugs are non-toxic: After expressing DREADDs you can use the corresponding designer drug to modify the activity of neurons over days or months whilst keeping the neurons healthy.
  • Using DREADDs and corresponding designer drugs allows you to modify neuronal activity non-invasively in in vivo models. A brain permeant designer drug can be administered peripherally (by injection, or orally for example) - it can then cross the blood-brain barrier to activate DREADD-expressing neurons.

DREADD ligands available from Hello Bio

CNO is an inert metabolite of a commonly used atypical antipsychotic. CNO potently activates muscarinic designer DREADD receptors (termed hM1-5D). These receptors have no affinity for the endogenous ligand acetylcholine (ACh), but are responsive to CNO. CNO has no significant affinity (Ki >1 μM) for other CNS targets. CNO stimulates hM3Dq (a Gq-coupled GPCR) to activate neuronal firing. In vivo, CNO activation of hM3Dq-expressing locus coeruleus neurons enhances memory in a mouse model of Down syndrome. Hello Bio offers water-soluble CNO dihydrochloride, and the freebase version of CNO (which is also water-soluble, but more difficult to handle in solution). For researchers wishing to use the freebase version, read our technical review on stability, solubility and use for CNO (freebase).

Compound 21 (DREADD agonist 21) is an analog of CNO which is a highly potent agonist at the excitatory hM3Dq DREADD. Compound 21 (DREADD agonist 21) has been indicated to have equivalent potency in vivo when compared with CNO but unlike CNO, has minimal off-target activity. View Datasheet for Compound 21 (DREADD agonist 21) and the water soluble Compound 21 (DREADD agonist 21) hydrochloride.

Perlapine is a potent and selective hM3Dq DREADD receptor agonist (EC50 = 2.8 nM) which shows >10,000 fold selectivity for hM3Dq compared to the hM3 muscarinic receptor. Perlapine also activates the inhibitory hM2Di and hM4Di DREADDs View Datasheet for Perlapine and the water soluble Perlapine hydrochloride.

SALB is a brain penetrant, potent and selective activator of κ-opioid DREADD (KORD) (EC50 = 11.8 nM). It is selective for KORD over the endogenous κ opioid receptor and other related targets. In KORD-expressing mouse models it induces neuronal hyperpolarization, and modifies locomotor activity and feeding behavior. However, it displays no ataxic or analgesic effects in wild type mice. View Datasheet for salvinorin B.

Hello Bio has also introduced J60 dihydrochloride and J52 dihydrochloride - novel DREADD ligands, active in vivo, with high potency and affinity for hM3Dq and hM4Di DREADDs. Read more about these novel DREADD ligands

Find out more with our DREADD mini-review

Read our latest mini-review on DREADDs. Written by our expert PhD qualified technical team, and endorsed by our Scientific Advisory Board, this mini-review summarizes some of the features of DREADDs and their ligands.