Abstract
Background: Our previous study has indicated that somatostatin potently inhibits neuropathic pain through the activation of its type 2 receptor (SSTR2) in mouse dorsal root ganglion and spinal cord. However, the underlying mechanism of this activation has not been elucidated clearly.
Objective: The aim of this study is to perform the pharmacological studies on the basis of sciatic nerve-pinch mice model and explore the underlying mechanism involving SSTR2. Methods: On the basis of a sciatic nerve-pinch injury model, we aimed at comparing the painful behavior and dorsal root ganglion neurons neurochemical changes after the SSTR2 antibody (anti- SSTR2;5μl,1μg/ml) administration in the mouse. Results: After pinch nerve injury, we found that the mechanical hyperalgesia and severely painful behavior (autotomy) were detected after the application of SSTR2 antibody (anti-SSTR2; 5μl, 1μg/ml) on the pinch-injured nerve. The up-regulated phosphorylated ERK (p-ERK) expression and the apoptotic marker (i.e., Bax) were significantly decreased in DRGs after anti-SSTR2 treatment. Conclusion: The current data suggested that inhibitory changes in proteins from the apoptotic pathway in anti-SSTR2-treated groups might be taking place to overcome the protein deficits caused by SSTR2 antibody and supported the new therapeutic intervention with SSTR2 antagonist for neuronal degeneration following nerve injury.Keywords: Somatostatin, somatostatin type-2 receptor, DRG, Bax protein, pinch nerve injury, painful behavior.
Graphical Abstract
[http://dx.doi.org/10.1507/endocrj.48.95] [PMID: 11403108]
[http://dx.doi.org/10.1016/S0079-6123(10)82011-4] [PMID: 20541669]
[http://dx.doi.org/10.1111/j.1471-4159.2004.02402.x] [PMID: 15147500]
[PMID: 9203845]
[http://dx.doi.org/10.1006/exnr.2002.8025] [PMID: 12504886]
[http://dx.doi.org/10.1007/s11064-008-9713-x] [PMID: 18452056]
[PMID: 7907281]
[http://dx.doi.org/10.1006/frne.1999.0183] [PMID: 10433861]
[http://dx.doi.org/10.1016/j.cellsig.2006.03.009] [PMID: 16677801]
[PMID: 2904115]
[http://dx.doi.org/10.1158/1078-0432.CCR-03-0359] [PMID: 15173065]
[http://dx.doi.org/10.1007/s00259-003-1255-5] [PMID: 12937948]
[http://dx.doi.org/10.1007/s00259-002-1040-x] [PMID: 12552343]
[PMID: 14583484]
[http://dx.doi.org/10.1097/00006231-199803000-00013] [PMID: 9625504]
[http://dx.doi.org/10.1124/mol.105.011767] [PMID: 15855408]
[http://dx.doi.org/10.1186/1744-8069-10-12] [PMID: 24521084]
[http://dx.doi.org/10.1016/S0306-4522(97)00258-3] [PMID: 9466443]
[http://dx.doi.org/10.1124/jpet.103.060574] [PMID: 14730005]
[http://dx.doi.org/10.1016/j.molmet.2013.08.006] [PMID: 24327954]
[http://dx.doi.org/10.1016/0024-3205(95)02082-T] [PMID: 7674817]
[PMID: 2903792]
[http://dx.doi.org/10.1113/jphysiol.1987.sp016704] [PMID: 2450994]
[http://dx.doi.org/10.1126/science.2892268] [PMID: 2892268]
[http://dx.doi.org/10.1073/pnas.86.23.9616] [PMID: 2574465]
[PMID: 2574175]
[http://dx.doi.org/10.1073/pnas.91.6.2315] [PMID: 7907795]
[http://dx.doi.org/10.1210/me.2009-0321] [PMID: 19910453]
[http://dx.doi.org/10.1038/35054063] [PMID: 11206547]
[http://dx.doi.org/10.2174/1871527317666180515121350]
[http://dx.doi.org/10.2174/1871527317666180420143830] [PMID: 29676237]
[PMID: 29435050]
[PMID: 29434920]
[PMID: 29399151]
[http://dx.doi.org/10.1016/bs.acr.2017.11.001] [PMID: 29405977]
[http://dx.doi.org/10.4149/av_2017_302] [PMID: 28854788]
[http://dx.doi.org/10.4161/auto.29639] [PMID: 24991825]
[http://dx.doi.org/10.1159/000480317] [PMID: 28848091]
[http://dx.doi.org/10.1016/j.cbi.2017.08.011] [PMID: 28842171]
[http://dx.doi.org/10.2174/1871527315666161223130409] [PMID: 28017131]