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Combinatorial Chemistry & High Throughput Screening

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ISSN (Print): 1386-2073
ISSN (Online): 1875-5402

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Research Article

Investigation of the Effects of Opioids on Microglial Nitrite and Nitric Oxide Synthase (iNOS) Production and Phagocytosis during Inflammation

Author(s): Yi Zhou, Xihua Lu, Yunfei Zhang, Changsheng Li, Yu Bai and Zhen Zhang*

Volume 26, Issue 10, 2023

Published on: 27 December, 2022

Page: [1900 - 1906] Pages: 7

DOI: 10.2174/1386207326666221111093915

Price: $65

Abstract

Aim: This study aimed to investigate how opioids affect phagocytosis and microglial nitrite and nitric oxide synthase (iNOS) production during inflammation.

Background: Opioids are a group of chemicals that are naturally found in the opium poppy plant and exert a variety of effects on the brain, including pain alleviation in some cases. They are commonly used in surgery and perioperative analgesia. However, research on the impact of opioids on microglial inflammatory factor production and phagocytosis is limited.

Objectives: This study was designed to investigate the effects of opioids on inducible nitric oxide synthase (iNOS) activity and nitric oxide (NO) generation. Moreover, the influence of opioids on the engulfment of C8-B4 microglial cells after stimulation with LPS was also examined.

Methods: C8-B4 mouse microglial cells were exposed to various concentrations of opioids after stimulation with lipopolysaccharide (LPS) and interferon-γ (IFN-γ). Nitrite production was assayed. The iNOS and Cox-2 were determined by Western blotting, and fluorescent immunostaining was performed to assess the percentage of microglia that engulfed fluorescent microspheres in total microglia cultivating with opioids after being activated by LPS.

Results: After LPS and IFN-γ stimulation, microglia produced lower amounts of nitric oxide (NO) production with buprenorphine, salvinorin A, and naloxone (P<0.05). When combined with naloxone, no significant differences were found than buprenorphine. It was observed that buprenorphine and salvinorin A could suppress iNOS expression activated by LPS and IFN-γ. Phagocytosis was greatly increased after LPS stimulation, and a significant increase was observed after adding salvinorin A.

Conclusion: Buprenorphine and salvinorin A were found to reduce NO production and iNOS induction in microglial cells activated by LPS and IFN-γ. Salvinorin A promoted the phagocytosis of microglia cells treated by LPS.

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