Immunomodulatory effects of intraoperative dexmedetomidine on T helper 1, T helper 2, T helper 17 and regulatory T cells cytokine levels and their balance: a prospective, randomised, double-blind, dose-response clinical study

Jae-Myeong Lee, Hyo-Jo Han, Won-Kyu Choi, Subin Yoo, Soojin Baek, Jaemin Lee, Jae-Myeong Lee, Hyo-Jo Han, Won-Kyu Choi, Subin Yoo, Soojin Baek, Jaemin Lee

Abstract

Background: The ratio of T helper 1 (Th1) to T helper 2 (Th2) as well as T helper 17 (Th17) to regulatory T cells (Treg) represents the state and direction of immune response. Recent studies demonstrated that dexmedetomidine reduced the secretion of inflammatory cytokines. We performed this study to investigate the effect of different doses of intraoperative dexmedetomidine on the expression of Th1, Th2, T17 and Treg cytokines and their ratios.

Methods: Seventy-five patients undergoing laparoscopic cholecystectomy were randomly separated into one of three groups: the full dose group (n = 25), in which dexmedetomidine was infused with a 1.0 μg/kg loading followed by an infusion of 0.5 μg/kg/min after anaesthetic induction, or the half dose group (n = 26), in which the dose was half of that of full dose group, or the saline group (n = 24) which was control. T cell cytokines were quantified by sandwich enzyme-linked immunoassay for blood samples taken after anaesthetic induction (T0), at the end of surgery (T1), and 60 min after surgery (T2). IFN-gamma/IL-4 and IL-17/IL-10, which represent the ratio of Th1/Th2 and Th17/Treg cytokines, respectively, were calculated as indices of immune cell levels based upon serum cytokines levels in place of direct measurements. C-reactive protein (CRP) concentrations were measured on the next day following surgery.

Results: The full dose group was associated with higher ratios of IFN-gamma/IL-4 than those of half dose group and control [10.1 vs. 1.9 at T1 (P = 0.041) compared with half dose group, and 10.1 vs. 0.2 at T1 (P = 0.031), 7.4 vs. 0.1 at T2 (P = 0.025) compared with control]. IL-17/IL-10 ratios were higher in the full dose group than those in control [4.2 vs. 0.6 at T1 (P = 0.013), 3.0 vs. 0.3 at T2 (P = 0.011)]. The CRP levels were lower in the dexmedetomidine-treated groups in a dose-dependent manner.

Conclusions: Dexmedetomidine exhibits immunomodulatory effects, shifting the Th1/Th2 and T17/Treg cytokine balance toward Th1 and T17, respectively, in a dose-dependent pattern in patients with surgical and anaesthetic stress.

Trial registration: Clinical Research Information Service, Republic of Korea (CRIS); KCT0000503 ; Registration date: Aug 13, 2012.

Keywords: Cytokines; Dexmedetomidine; Surgery; T cell; T17/Treg balance; Th1/Th2 balance.

Conflict of interest statement

Ethics approval and consent to participate

This study was approved by the Institutional Review Board of Seoul St. Mary’s Hospital, The Catholic University of Korea (approval number, KC10MISI0725), and each patient gave written informed consent in advance.

Consent for publication

All participants gave their signed informed consent to the publication of study data.

Competing interests

The authors declare that they have no competing interests.

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Figures

Fig. 1
Fig. 1
Flow diagram of randomisation and follow-up of enrolled participants
Fig. 2
Fig. 2
Comparison of C-reactive protein levels on postoperative day 1. Box shows the mean and error bar indicates SD. S, saline; HD, half dose; FD, full dose

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