TY - JOUR ID - 4734 TI - Propofol differentially inhibits the release of glutamate, γ-aminobutyric acid and glycine in the spinal dorsal horn of rats JO - Iranian Journal of Basic Medical Sciences JA - IJBMS LA - en SN - 2008-3866 AU - Yang, Jing AU - Wang, Wei AU - Yong, Zheng AU - Mi, Weidong AU - Zhang, Hong AD - Department of Anesthesiology, Chinese People Liberation Army (PLA) General Hospital, Beijing 100853, China AD - Department of Orthopedics, Chinese People Liberation Army (PLA) General Hospital, Beijing 100853, China AD - Department of Pharmacology, Institution of Pharmacology and Toxicology, 100039, China Y1 - 2015 PY - 2015 VL - 18 IS - 8 SP - 822 EP - 826 KW - Amino acids KW - Anesthetics KW - Dorsal horn KW - Microdialysis KW - Propofol DO - 10.22038/ijbms.2015.4734 N2 - Objective(s): Propofol (2, 6-diisopropylphenol) is an intravenous anesthetic that is commonly used for the general anesthesia. It is well known that the spinal cord is one of the working targets of general anesthesia including propofol. However, there is a lack of investigation of the effects of propofol on spinal dorsal horn which is important for the sensory transmission of nociceptive signals. The objective of this study was to investigate the effects of increasing dosage of propofol on the release of glutamate (Glu), γ-aminobutyric acid (GABA) and glycine (Gly) in the spinal dorsal horn. Materials and Methods: The efflux of Glu, GABA or Gly in the spinal dorsal horn of rats was detected using transverse spinal microdialysis under an awake condition and various depths of propofol anesthesia. The infusion rates of propofol were, in order, 400 µg/(kg·min), 600 µg/(kg·min) and 800 µg/(kg·min), with a 20 min infusion period being maintained at each infusion rate. Results: Propofol decreased the glutamate efflux within spinal dorsal horn in a dose-dependent manner, and the maximum decrease was 56.8 ± 6.0% at high-dose propofol infusion producing immobility. The inhibitory GABA and Gly efflux was also decreased about 15–20% at low-dose propofol infusion only producing sedation, but did not continue to drop with higher doses of propofol. Conclusion: Propofol decreased both excitatory and inhibitory amino acids efflux in spinal dorsal horn, and the preferential suppression of the excitatory amino acid might be associated with the analgesic effect of propofol. UR - https://ijbms.mums.ac.ir/article_4734.html L1 - https://ijbms.mums.ac.ir/article_4734_79831e3acba25f55d136a830506e3d28.pdf ER -