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Article

Spinal PAR2 Activation Contributes to Hypersensitivity Induced by Peripheral Inflammation in Rats

Laboratory of Pain Research, Institute of Physiology, Czech Academy of Sciences, Videnska 1083, 142 20 Prague 4, Czech Republic
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Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2021, 22(3), 991; https://doi.org/10.3390/ijms22030991
Received: 22 December 2020 / Revised: 16 January 2021 / Accepted: 17 January 2021 / Published: 20 January 2021
The mechanisms of inflammatory pain need to be identified in order to find new superior treatments. Protease-activated receptors 2 (PAR2) and transient receptor potential vanilloid 1 (TRPV1) are highly co-expressed in dorsal root ganglion neurons and implicated in pain development. Here, we examined the role of spinal PAR2 in hyperalgesia and the modulation of synaptic transmission in carrageenan-induced peripheral inflammation, using intrathecal (i.t.) treatment in the behavioral experiments and recordings of spontaneous, miniature and dorsal root stimulation-evoked excitatory postsynaptic currents (sEPSCs, mEPSCs and eEPSCs) in spinal cord slices. Intrathecal PAR2-activating peptide (AP) administration aggravated the carrageenan-induced thermal hyperalgesia, and this was prevented by a TRPV1 antagonist (SB 366791) and staurosporine i.t. pretreatment. Additionally, the frequency of the mEPSC and sEPSC and the amplitude of the eEPSC recorded from the superficial dorsal horn neurons were enhanced after acute PAR2 AP application, while prevented with SB 366791 or staurosporine pretreatment. PAR2 antagonist application reduced the thermal hyperalgesia and decreased the frequency of mEPSC and sEPSC and the amplitude of eEPSC. Our findings highlight the contribution of spinal PAR2 activation to carrageenan-induced hyperalgesia and the importance of dorsal horn PAR2 and TRPV1 receptor interactions in the modulation of nociceptive synaptic transmission. View Full-Text
Keywords: PAR2; TRPV1; synaptic transmission; superficial dorsal horn; spinal cord; nociception; peripheral inflammation; thermal hyperalgesia; inflammatory pain PAR2; TRPV1; synaptic transmission; superficial dorsal horn; spinal cord; nociception; peripheral inflammation; thermal hyperalgesia; inflammatory pain
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MDPI and ACS Style

Mrozkova, P.; Spicarova, D.; Palecek, J. Spinal PAR2 Activation Contributes to Hypersensitivity Induced by Peripheral Inflammation in Rats. Int. J. Mol. Sci. 2021, 22, 991. https://doi.org/10.3390/ijms22030991

AMA Style

Mrozkova P, Spicarova D, Palecek J. Spinal PAR2 Activation Contributes to Hypersensitivity Induced by Peripheral Inflammation in Rats. International Journal of Molecular Sciences. 2021; 22(3):991. https://doi.org/10.3390/ijms22030991

Chicago/Turabian Style

Mrozkova, Petra, Diana Spicarova, and Jiri Palecek. 2021. "Spinal PAR2 Activation Contributes to Hypersensitivity Induced by Peripheral Inflammation in Rats" International Journal of Molecular Sciences 22, no. 3: 991. https://doi.org/10.3390/ijms22030991

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