Journal: Journal of Pain Research
Article Title: The Interaction Between Spinal PDGFRβ and μ Opioid Receptor in the Activation of Microglia in Morphine-Tolerant Rats
doi: 10.2147/JPR.S255221
Figure Lengend Snippet: Involvement of JNK signaling in MOR-induced PDGFRβ activation in morphine tolerance. ( A ) Pretreatment with naloxone 30 minutes before morphine administration inhibited the phosphorylation of JNK induced by morphine measured by Western blots. ** P <0.01, vs NS+DMSO rats; # P <0.05, vs Morphine+DMSO rats. ( B ) The %MPE in rats receiving JNK inhibitor SP600125 30 minutes before morphine administration were higher than those in morphine-tolerant rats from day 5 to 7. ** P <0.01, vs Morphine+DMSO rats. ( C–E ) Pretreatment with SP600125 reduced increased expressions of p-c-Jun ( C ), p-PDGFRβ ( D ), and Iba1 ( E ) induced by morphine measured by Western blots. * P <0.05, *** P <0.001, vs NS+DMSO rats; # P <0.05, ## P <0.01, vs Morphine+DMSO rats. ( F ) Pretreatment with imatinib had no influence on the increased expression of p-JNK induced by morphine measured by Western blots. ** P <0.01, vs NS+NS rats. Values represent mean±SEM. n=6 in each group. Abbreviations: NS, normal saline; DMSO, dimethyl sulfoxide; %MPE, the percentage of maximal possible antinociceptive effect.
Article Snippet: Specific JNK MAPK inhibitor SP600125 (50 μg/10 μL, MedChem Express, China) and selective MOR antagonist naloxone (10 μg/10 μL, Selleckchem, USA) were dissolved in 20% dimethyl sulfoxide (DMSO, Sigma, USA), respectively.
Techniques: Activation Assay, Phospho-proteomics, Western Blot, Expressing, Saline