Abstract:
:Sigma-1 receptors (S1R) and sigma-2 receptors (S2R) may modulate nociception without the liabilities of opioids, offering a promising therapeutic target to treat pain. The purpose of this study was to investigate the in vivo analgesic and anti-allodynic activity of two novel sigma receptor antagonists, the S1R-selective CM-304 and its analog the non-selective S1R/S2R antagonist AZ-66. Inhibition of thermal, induced chemical or inflammatory pain, as well as the allodynia resulting from chronic nerve constriction injury (CCI) and cisplatin exposure as models of neuropathic pain were assessed in male mice. Both sigma receptor antagonists dose-dependently (10-45 mg/kg, i.p.) reduced allodynia in the CCI and cisplatin neuropathic pain models, equivalent at the higher dose to the effect of the control analgesic gabapentin (50 mg/kg, i.p.), although AZ-66 demonstrated a much longer duration of action. Both CM-304 and AZ-66 produced antinociception in the writhing test [0.48 (0.09-1.82) and 2.31 (1.02-4.81) mg/kg, i.p., respectively] equivalent to morphine [1.75 (0.31-7.55) mg/kg, i.p.]. Likewise, pretreatment (i.p.) with either sigma-receptor antagonist dose-dependently produced antinociception in the formalin paw assay of inflammatory pain. However, CM-304 [17.5 (12.7-25.2) mg/kg, i.p.) and AZ-66 [11.6 (8.29-15.6) mg/kg, i.p.) were less efficacious than morphine [3.87 (2.85-5.18) mg/kg, i.p.] in the 55°C warm-water tail-withdrawal assay. While AZ-66 exhibited modest sedative effects in a rotarod assay and conditioned place aversion, CM-304 did not produce significant effects in the place conditioning assay. Overall, these results demonstrate the S1R selective antagonist CM-304 produces antinociception and anti-allodynia with fewer liabilities than established therapeutics, supporting the use of S1R antagonists as potential treatments for chronic pain.
journal_name
Front Pharmacoljournal_title
Frontiers in pharmacologyauthors
Cirino TJ,Eans SO,Medina JM,Wilson LL,Mottinelli M,Intagliata S,McCurdy CR,McLaughlin JPdoi
10.3389/fphar.2019.00678subject
Has Abstractpub_date
2019-06-14 00:00:00pages
678issn
1663-9812journal_volume
10pub_type
杂志文章abstract::[This corrects the article on p. 42 in vol. 9, PMID: 29487522.]. ...
journal_title:Frontiers in pharmacology
pub_type: 杂志文章,已发布勘误
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