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• W2076259277 abstract "Somatostatin (SST) in spinal cord has been linked with the inhibition of nociceptive neurotransmission in several experimental paradigms. The SST2 receptor (SSTR2) is the main SST receptor subtype in the superficial dorsal horn (DH) and is activated, besides to the naïve peptide, by the SST synthetic analogue octreotide (OCT). In the present work, we have studied the central effects of SSTR2 activation on capsaicin (CAP)-induced glutamate release in mouse DH. In neurons of the lamina II of DH, CAP (2 μM) induced a strong increase of mEPSC frequency that was significantly reduced (70%) by OCT. SSTR2 involvement was assessed by using the specific antagonist CYN 154806. No differences were observed between frequency increase in CAP alone vs. CAP in the presence of CYN 154806+OCT. The effect of OCT was further investigated by studying c-fos expression in spinal cord slices. The CAP-induced increase in density of Fos immunoreactive nuclei in the superficial DH was strongly prevented by OCT. SSTR2a (a splicing variant of SSTR2) immunoreactivity was found in both pre- and post-synaptic compartments of laminae I-II synapses. By light and electron microscopy, SSTR2a was mainly localized onto non-peptidergic isolectin B4 (IB4)-positive primary afferent fibres (PAFs). A subset of them was also found to express the CAP receptor TRPV1. These data show that the SST analogue OCT inhibits CAP-mediated activation of non-peptidergic nociceptive PAFs in lamina II. Our data indicate that SSTR2a plays an important role in the pre-synaptic modulation of central excitatory nociceptive transmission in mouse." @default.
• W2076259277 created "2016-06-24" @default.
• W2076259277 creator A5048862503 @default.
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• W2076259277 creator A5088243863 @default.
• W2076259277 date "2011-07-01" @default.
• W2076259277 modified "2023-10-09" @default.
• W2076259277 title "The somatostatin analogue octreotide inhibits capsaicin-mediated activation of nociceptive primary afferent fibres in spinal cord lamina II (<i>substantia gelatinosa</i>)" @default.
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• W2076259277 doi "https://doi.org/10.1016/j.ejpain.2010.11.001" @default.
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