Abstract
In this chapter we discuss the many recent discoveries of the mechanisms by which itch is transmitted: the neurotransmitters and the responses they trigger, the mechanisms by which specific neuronal targets are activated, and the specificity of the pathways. Current data reveal that DRG neurons and spinal cord cells use a remarkably selective set of transmitters to convey pruritic information from the periphery to the brain: glutamate and Nppb are released from primary itch-sensory cells; these molecules activate secondary spinal cord pruriceptive-specific neurons, which in turn utilize Grp to activate tertiary pruriceptive-selective neurons. Intersecting this basic linear excitatory pathway, inhibitory input from dynorphin and neurons that express the somatostatin receptor modify itch sensation. Cumulatively, these studies paint an elegantly simple picture of how itch signals are transformed and integrated in the spinal cord and open new avenues for research efforts aimed at understanding and better treating itch.
We are grateful to Leah Pogorzala and Hans Jürgen Solinski for their valuable suggestions. This work was supported by the intramural research program of the NIDCR NIH.
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Abbreviations
- Bhlhb5:
-
Basic helix-loop-helix transcription factor 5 inhibitory neurons
- DRG:
-
Dorsal root ganglion
- Grp:
-
Gastrin-releasing peptide
- Grpr:
-
Gastrin-releasing peptide receptor
- NK-1:
-
Neurokinin 1
- Nmb:
-
Neuromedin b
- Nppb:
-
Natriuretic polypeptide b
- Npr1:
-
Natriuretic peptide receptor 1
- Npr2:
-
Natriuretic peptide receptor 2
- PLC:
-
Phospholipase C
- Sst:
-
Somatostatin
- Sstr2:
-
Somatostatin receptor 2
- Tlx3:
-
T-cell leukemia homeobox 3
- TR4:
-
Testicular orphan nuclear receptor 4
- TRPV1:
-
Transient receptor potential subfamily vanilloid member 1
- VGlut2:
-
Vesicular glutamate transporter 2
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Mishra, S.K., Hoon, M.A. (2015). Transmission of Pruriceptive Signals. In: Cowan, A., Yosipovitch, G. (eds) Pharmacology of Itch. Handbook of Experimental Pharmacology, vol 226. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-44605-8_8
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