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KMID : 0363120230360020163
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Korean Journal of Pain
2023 Volume.36 No. 2 p.163 ~ p.172
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Calcium/calmodulin-dependent protein kinase II is involved in the transmission and regulation of nociception in naive and morphine-tolerant rat nucleus accumbens
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Kai Wen Xi
De Duo Chen
Xin Geng
Yan Bian
Min Xin Wang
Hui Bian
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Abstract
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Background : Synaptic plasticity contributes to nociceptive signal transmission and modulation, with calcium/calmodulin-dependent protein kinase II (CaMK II) playing a fundamental role in neural plasticity. This research was conducted to investigate the role of CaMK II in the transmission and regulation of nociceptive information within the nucleus accumbens (NAc) of naive and morphine-tolerant rats.
Methods : Randall Selitto and hot-plate tests were utilized to measure the hindpaw withdrawal latencies (HWLs) in response to noxious mechanical and thermal stimuli. To induce chronic morphine tolerance, rats received intraperitoneal morphine injection twice per day for seven days. CaMK II expression and activity were assessed using western blotting.
Results : Intra-NAc microinjection of autocamtide-2-related inhibitory peptide (AIP) induced an increase in HWLs in naive rats in response to noxious thermal and mechanical stimuli. Moreover, the expression of the phosphorylated CaMK II (p-CaMK II) was significantly decreased as determined by western blotting. Chronic intraperitoneal injection of morphine resulted in significant morphine tolerance in rats on Day 7, and an increase of p-CaMK II expression in NAc in morphine-tolerant rats was observed. Furthermore, intra-NAc administration of AIP elicited significant antinociceptive responses in morphine-tolerant rats. In addition, compared with naive rats, AIP induced stronger thermal antinociceptive effects of the same dose in rats exhibiting morphine tolerance.
Conclusions : This study shows that CaMK II in the NAc is involved in the transmission and regulation of nociception in naive and morphine-tolerant rats.
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KEYWORD
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Analgesics, Calcium-Calmodulin-Dependent Protein Kinase Type 2, Morphine, Neuronal Plasticity, Nociception, Nucleus Accumbens, Pain, Peptides, Rats
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