The correlation between CYP2D6 isoenzyme activity and haloperidol efficacy and safety profile in patients with alcohol addiction during the exacerbation of the addiction
Authors Sychev D, Zastrozhin MS, Smirnov V, Grishina E, Savchenko L, Bryun E
Received 12 April 2016
Accepted for publication 17 June 2016
Published 14 September 2016 Volume 2016:9 Pages 89—95
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 2
Editor who approved publication: Dr Martin Bluth
Dmitry Alekseevich Sychev,1 Mikhail Sergeevich Zastrozhin,1–3 Valery Valerieevich Smirnov,4 Elena Anatolievna Grishina,1 Ludmila Mikhailovna Savchenko,1 Evgeny Alekseevich Bryun1,2
1Russian Medical Academy of Postgraduate Education, Ministry of Health of the Russian Federation, 2Department of Public Health, Moscow Research and Practical Centre for Narcology, 3Peoples’ Friendship University of Russia, 4National Research Center, Institute of Immunology Federal Medical-Biological Agency of Russia, Moscow, Russia
Background: Today, it is proved that isoenzymes CYP2D6 and CYP3A4 are involved in metabolism of haloperidol. In our previous investigation, we found a medium correlation between the efficacy and safety of haloperidol and the activity of CYP3A4 in patients with alcohol abuse.
Objective: The aim of this study was to evaluate the correlation between the activity of CYP2D6 and the efficacy and safety of haloperidol in patients with diagnosed alcohol abuse.
Methods: The study involved 70 men (average age: 40.83±9.92 years) with alcohol addiction. A series of psychometric scales were used in the research. The activity of CYP2D6 was evaluated by high-performance liquid chromatography with mass spectrometry using the ratio of 6-hydroxy-1,2,3,4-tetrahydro-beta-carboline to pinoline. Genotyping of CYP2D6 (1846G>A) was performed using real-time polymerase chain reaction.
Results: According to results of correlation analysis, statistically significant values of Spearman correlation coefficient (rs) between the activity of CYP2D6 and the difference of points in psychometric scale were obtained in patients receiving haloperidol in injection form (Sheehan Clinical Anxiety Rating Scale =-0.721 [P<0.001] and Udvald for Kliniske Undersogelser Side Effect Rating Scale =0.692 [P<0.001]) and in those receiving haloperidol in tablet form (Covi Anxiety Scale =-0.851 [P<0.001] and Udvald for Kliniske Undersogelser Side Effect Rating Scale =0.797 [P<0.001]).
Conclusion: This study demonstrated the correlations between the activity of CYP2D6 isozyme and the efficacy and safety of haloperidol in patients with alcohol addiction.
Keywords: haloperidol, biotransformation, CYP2D6, side effects, alcohol addiction
Haloperidol is one of the most commonly used typical antipsychotics. It has a powerful antipsychotic effect owing to its ability to antagonize mesolimbic postsynaptic D-2 receptor. According to the guidelines, haloperidol is recommended for patients with alcohol-related psychosis.1,2 Haloperidol in combination with a benzodiazepine is used to treat severe psychotic symptoms. Under the guidelines, the recommended dose of haloperidol is 1–5 mg two to three times a day.3 The exacerbation of addiction to psychoactive substances with psychomotor agitation is the main indication for use of haloperidol in patients with addictive disorders in the Russian Federation.4 The use of haloperidol can cause various side effects (dyskinesia, dystonia, reduced blood pressure, orthostatic hypotension, and arrhythmias). Therefore, alcohol abusers’ attitudes toward haloperidol are ambiguous and often negative, which sometimes limits its administration in patients with addictive disorders.
Cytosolic carbonyl reductase reduces haloperidol to its reduced form that has 10%–20% of activity of the parent molecule. CYP3A4 catalyzes the metabolism of haloperidol to haloperidol 1,2,3,6-tetrahydropyridine.5 Haloperidol 1,2,3,6-tetrahydropyridine is further metabolized to haloperidol pyridinium by both CYP3A4 and CYP2D6.5 CYP3A4 and CYP2D6 are also responsible for the N-dealkylation of haloperidol.5 The N-dealkylation of reduced haloperidol is catalyzed by CYP3A4.5 CYP3A4 also catalyzes the oxidation of reduced haloperidol back to haloperidol.5 In the investigation of Van der Weide and van der Weide,6 no difference was found in serum (dose-corrected) concentrations of haloperidol between CYP3A4*22 wild-type and carrier groups.6 In our previous investigation, we confirmed the relationship between the activity of CYP3A4 and the efficacy and safety of haloperidol in patients with alcohol abuse.7 The correlation between CYP2D6 activity and the rate of biotransformation of haloperidol was demonstrated in a number of studies on patients with schizophrenia.6,8,9 At the same time, some studies demolished the presence of this correlation.10 There were no studies about the relationship between the rate of biotransformation of haloperidol and the activity of CYP2D6 in patients with alcohol addiction, and there is lack of data on the relationship between the activity of CYP2D6 and the efficacy and safety of haloperidol in patients with any addictions to psychoactive substances.
The purpose of the current investigation was to evaluate the correlation between the activity of CYP2D6 and the efficacy and safety of haloperidol in patients with alcohol addiction.
Patients and methods
The study involved 70 men with alcohol addiction, who were hospitalized in Moscow Research and Practical Centre for Narcology of the Department of Public Health. The study was approved by the local ethics committee of the Peoples’ Friendship University of Russia (No 8 Minutes of February 18, 2016) and all patients provided written informed consent. During the exacerbation of the addiction, patients received haloperidol in tablet form (OOO Ozon, Ghigulevsk, Russia) at a dose of 4.34±2.38 mg/d (38 patients, once a day) and injectable forms (ZAO Bryntsalov-A, Moscow, Russia) at a dose of 6.09±2.10 mg/d (32 patients, once a day). Inclusion criteria were 5-day haloperidol therapy in tablet or injection form and no concomitant mental illness in anamnesis. Exclusion criteria were presence of any other antipsychotics in treatment, creatinine clearance <50 mL/min, concentration of creatinine in the blood plasma ≥1.5 mg/dL (133 mmol/L); weight <60 kg or >100 kg; age 75 years or older; and contraindications for haloperidol.
The activity of CYP2D6 was evaluated by determining urinary concentration of endogenous substrate of the enzyme and its metabolite – the ratio of 6-hydroxy-1,2,3,4-tetrahydro-beta-carboline (6-HO-THBC) to pinoline11 using high-performance liquid chromatography with mass spectrometry on an Agilent 1290 Infinity. The higher the ratio, the higher the activity of CYP2D6. The results are demonstrated in arbitrary units.
Venous blood drawn in vacuum tubes Vacuette® (Greiner Bio-One, Kremsmünster, Austria) on the sixth day after the start of the therapy was used for genotyping. The real-time polymerase chain reaction on a DNA amplifier “Dtlite” of DNA Technology (Moscow, Russia) and CFX96 Touch Real Time System with CFX Manager software of Bio-Rad Laboratories Inc. (Hercules, CA, USA) and sets “SNP-Screen” of Syntol (Moscow, Russia) was used to determine polymorphism 1846G>A of CYP2D6 gene (rs3892097). In every “SNP-Screen” set, two allele-specific hybridizations were used, which allowed us to separately determine two alleles of studied polymorphism on two channels of fluorescence.
The efficacy of haloperidol was evaluated by international psychometric scales: Scale of Pathological Addiction (SoPA), Hamilton Anxiety Rating Scale (HARS), Beck Anxiety Inventory (BAI), Covi Anxiety Scale (CARS), Zung Self-Rating Anxiety Scale (ZARS), Sheehan Clinical Anxiety Rating Scale (SARS), and Hamilton Rating Scale for Depression (HDRS). The safety of haloperidol was evaluated by Udvald for Kliniske Undersogelser Side Effect Rating Scale (UKU) and Simpson–Angus Scale for Extrapyramidal Symptoms (SAS). Scaling of patients was performed the day before haloperidol therapy and after 5-day therapy. The higher the difference in scores was, the more unsafe the therapy was.
Statistical analysis of the results was done by nonparametric methods using the “Statsoft Statistica V10.0” program (Dell Statistica, Tulsa, OK, USA). The normality of distributions of samples, that was evaluated using W-Shapiro–Wilk test, was taken into account when choosing a method. The differences were considered as statistically significant at P<0.05 (statistical power in excess of 80%). Spearman rank correlation coefficient (rS) was calculated to determine the correlation between quantitative characteristics. The value of correlation coefficient rs from 0.3 to 0.7 (P<0.05) indicated positive moderate, but significant correlation between the characteristics, rs>0.7 (P<0.05) – strong and significant correlation, negative value of rs indicated inverse correlation. Regression analysis was performed in “Multiple Regression module” to determine the influence of CYP2D6 activity (as measured by the ratio of 6-hydroxy-1,2,3,4-tetrahydro-beta-carboline to pinoline) on the effectiveness of treatment (as measured on a scale of SoPA, as the most complete method of assessing the severity of a pathological inclination) and safety of treatment (measured on a scale of UKU, as the most complete method of assessing the severity of extrapyramidal disorders).
All quantitative data are presented as arithmetic mean ± SD.
As a result of CYP2D6 genotyping (polymorphic marker 1846G>A [rs3892097]) in 70 patients with alcohol addiction, the following data were obtained:
- The number of patients with no mutant CYP2D6 gene (genotype GG) accounted 53 (75.71%); 23 of them (32.8%) received haloperidol in injection form, and 30 (42.85%) received haloperidol in tablet form.
- The number of patients with heterozygous polymorphism 1846G>A of CYP2D6 gene (genotype GA) accounted for 17 (24.29%); eight of them (11.43%) received haloperidol in injection form, and nine (12.86%) received haloperidol in tablet form.
- There were no patients with homozygous polymorphism 1846G>A of CYP2D6 gene (genotype AA).
The distribution of genotypes corresponded to Hardy–Weinberg equilibrium in the European population (Fisher’s exact test χ2=1.34; P=0.25).
Table 1 The general characteristics of participants
Notes: aMann–Whitney U-test. Data shown as mean ± standard deviation unless otherwise indicated.
The results of CYP2D6 phenotyping are presented in Table 3.
The differences in scores (the efficacy and safety of haloperidol therapy) in groups of patients with the GG and GA genotype of CYP2D6 gene (1846G>A) were compared using nonparametric Mann–Whitney test, thus working out the profile of efficacy and safety of the therapy (Tables 4 and 5).
Table 4 Results of determination of the urinary concentration of pinoline and 6-HO-THBC using HPLC-MS/MS
Abbreviations: 6-HO-THBC, 6-hydroxy-1,2,3,4-tetrahydro-beta-carboline; HPLC-MS/MS, high-performance liquid chromatography with mass spectrometry.
The Spearman correlation analysis demonstrated a statistically significant negative moderate correlation between the concentrations of pinoline, 6-HO-THBC, their ratio and the difference in scores on the SoPA, HARS, BAI, CARS, ZARS, SARS, HDRS scales (the efficacy of therapy) and a positive moderate correlation between the concentrations of pinoline, 6-HO-THBC, their ratio and the difference in scores on the UKU and SAS scales (the safety of therapy) in patients who received haloperidol in injection (Table 6) and tablet (Table 7) forms.
Linear regression analysis allowed us to construct a model of correlation between activity of CYP2D6 and difference in scores on SoPA (efficacy of addiction exacerbation treatment) and the UKU scale (safety of treatment) in patients receiving haloperidol in injection form (Figure 1) and tablet form (Figure 2, Table 8).
Coefficients of linear regression y=a+b×x (x – index of activity CYP2D6, y – difference in points on a scale, a and b – coefficients of the equation), that demonstrate correlation between activity of CYP2D6 and difference in scores on SoPA, HARS, BAI, CARS, ZARS, SARS, HDRS, UKU, and SAS scales, are presented in Table 9.
Today, there is information that CYP2D6 takes part in metabolism of haloperidol.5 There were some investigations about relationship of CYP2D6 polymorphism and safety and efficacy of haloperidol in patients with schizophrenia,6,8–10 but there was no investigation about relationship of CYP2D6 activity (as measured by the ratio of 6-hydroxy-1,2,3,4-tetrahydro-beta-carboline to pinoline) and CYP2D6 polymorphism and efficacy and safety of haloperidol in patients with alcohol abuse.
In this investigation, we statistically demonstrated that the efficacy and safety of haloperidol in patients with alcohol addiction depend on the activity of CYP2D6 isozyme. The higher the CYP2D6 activity is, the lower the efficacy of haloperidol is, which is probably due to acceleration of biotransformation and elimination of haloperidol. Safety indices increase with increasing activity of CYP2D6 that is also due to acceleration of elimination of haloperidol. This is confirmed by the results that were obtained in earlier investigations in patients with schizophrenia.6,8,9
Average therapeutic dose should be carefully administered in patients with high activity of CYP2D6, as high activity of CYP2D6 inhibits the achievement of therapeutic concentrations, which results in no therapeutic effect. In patients with low activity of CYP2D6 and who received an average therapeutic dose of haloperidol, its concentration in plasma may be higher, which will lead to increased frequency and severity of side effects. Haloperidol is contraindicated in patients with very high or very low activity of CYP2D6; therefore, other antipsychotics, in which biotransformation of CYP2D6 is not involved, are recommended.
The correlation between the activity of CYP2D6 isozyme and the efficacy and safety of haloperidol was demonstrated in this research on a group of 70 patients with alcohol addiction.
The authors are grateful to KB Mirzaev, KA Rizhikova, JA Avdeeva and NE Snalina at the research center of Russian Medical Academy of Postgraduate Education, Ministry of Health of the Russian Federation for assistance in the genotyping of patients. This work was supported by the Russian Science Foundation. The project 16-15-00227 “Fundamental research and exploratory research in priority areas of research”. The abstract of this paper was presented at the First International Conference on “Personalized psychiatry: modern possibilities of genetics in psychiatry” (Russia, Moscow, 2015) as a poster presentation with interim findings. The poster’s abstract was published in The Bulletin of Russian State Medical University.12
The authors report no conflicts of interest in this work.
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