Title |
B-Type Natriuretic Peptide is Neither Itch-Specific Nor Functions Upstream of the GRP-GRPR Signaling Pathway
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Published in |
Molecular Pain, January 2014
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DOI | 10.1186/1744-8069-10-4 |
Pubmed ID | |
Authors |
Xian-Yu Liu, Li Wan, Fu-Quan Huo, Devin M Barry, Hui Li, Zhong-Qiu Zhao, Zhou-Feng Chen |
Abstract |
A recent study by Mishra and Hoon identified B-type natriuretic peptide (BNP) as an important peptide for itch transmission and proposed that BNP activates spinal natriuretic peptide receptor-A (NPRA) expressing neurons, which release gastrin releasing peptide (GRP) to activate GRP receptor (GRPR) expressing neurons to relay itch information from the periphery to the brain (Science 340:968-971, 2013). A central premise for the validity of this novel pathway is the absence of GRP in the dorsal root ganglion (DRG) neurons. To this end, they showed that Grp mRNA in DRG neurons is either absent or barely detectable and claimed that BNP but not GRP is a major neurotransmitter for itch in pruriceptors. They showed that NPRA immunostaining is perfectly co-localized with Grp-eGFP in the spinal cord, and a few acute pain behaviors in Nppb-/- mice were tested. They claimed that BNP is an itch-selective peptide that acts as the first station of a dedicated neuronal pathway comprising a GRP-GRPR cascade for itch. However, our studies, along with the others, do not support their claims. |
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