NDLI: Capsaicin Up-Regulates Protease-Activated Receptor-4 mRNA and Protein in Primary Cultured Dorsal Root Ganglion Neurons

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Capsaicin Up-Regulates Protease-Activated Receptor-4 mRNA and Protein in Primary Cultured Dorsal Root Ganglion Neurons

Content Provider	Springer Nature Link
Author	Chen, Dan Wang, Zhaojin Zhang, Zaifeng Zhang, Rui Yu, Lianfeng
Copyright Year	2012
Abstract	Previous study has shown that there is a functional link between the transient receptor potential vanilloid type 1 (TRPV1) receptor and protease-activated receptor-4 (PAR4) in modulation of inflammation and pain. Capsaicin activation of TRPV1 is involved in enhancement of the expression of TRPV1 in mRNA and protein in dorsal root ganglion (DRG) in vivo. Whether capsaicin could influence expression of PAR4 in primary sensory neurons remains unknown. In the present study, expression of PAR4 in cultured rat DRG neurons was observed using immunofluorescence, real-time PCR and Western blots to examine whether increases in PAR4 mRNA and protein levels are induced by capsaicin treatment with or without pre-treatment of forskolin, a cyclic AMP/protein kinase A (cAMP/PKA) activator or PKA inhibitor fragment 14-22 (PKI14-22), a PKA inhibitor. Capsaicin treatment of cultured DRG neurons significantly increased the expression of PAR4 in mRNA and protein levels. The percentage of PAR4-, TRPV1-immunoreactive neurons and their co-localization in cultured DRG neurons increased significantly in the presence of capsaicin as compared with that in the absence of capsaicin. Compared with capsaicin-only group, pre-incubation with forskolin strongly enhanced the capsaicin-induced increase of PAR4 in mRNA and protein levels. Consistent with the involvement of PKA in the modulation of PAR4 expression, this evoked expression both at mRNA and protein levels was significantly inhibited after PKA was inhibited by pre-incubation with PKI14-22. Taken together, these results provide evidence that TRPV1 activation significantly increases the expression of PAR4 mRNA and protein levels in primary cultures of DRG neurons after capsaicin incubation. Effects of capsaicin on PAR4 expression appear to be mediated by cAMP/PKA signal pathways in DRG neurons.
Starting Page	337
Ending Page	346
Page Count	10
File Format	PDF
ISSN	02724340
Journal	Cellular and Molecular Neurobiology
Volume Number	33
Issue Number	3
e-ISSN	15736830
Language	English
Publisher	Springer US
Publisher Date	2012-12-30
Publisher Place	Boston
Access Restriction	Subscribed
Subject Keyword	Protease-activated receptor-4 Transient receptor potential vanilloid type 1 Cultured primary afferent neurons Protein kinase A Real-time PCR Rat Neurosciences Cell Biology Neurobiology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Medicine Cellular and Molecular Neuroscience

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Capsaicin Up-Regulates Protease-Activated Receptor-4 mRNA and Protein in Primary Cultured Dorsal Root Ganglion Neurons