1
|
Brewster PR, Mohammad Ishraq Bari S, Walker GM, Werfel TA. Current and Future Directions of Drug Delivery for the Treatment of Mental Illnesses. Adv Drug Deliv Rev 2023; 197:114824. [PMID: 37068660 DOI: 10.1016/j.addr.2023.114824] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 03/22/2023] [Accepted: 04/11/2023] [Indexed: 04/19/2023]
Abstract
Mental illnesses including anxiety disorders, autism spectrum disorder, post-traumatic stress disorder, schizophrenia, depression, and others exact an immense toll on the healthcare system and society at large. Depression alone impacts 21 million adults and costs over $200 billion annually in the United States. However, pharmaceutical strategies to treat mental illnesses are lagging behind drug development in many other disease areas. Because many of the shortcomings of therapeutics for mental illness relate to delivery problems, drug delivery technologies have the potential to radically improve the effectiveness of therapeutics for these diseases. This review describes the current pharmacotherapeutic approaches to treating mental illnesses as well as drug delivery approaches that have improved existing therapies. Approaches to improve drug bioavailability, provide controlled release of therapeutics, and enable drug targeting to the central nervous system (CNS) will be highlighted. Moreover, next-generation delivery approaches such as environmentally-controlled release and interval/sequential drug release will be addressed. Based on the evolving landscape of the treatment of mental illnesses, the nascent field of drug delivery in mental health has tremendous potential for growth in terms of both economic and patient impact.
Collapse
Affiliation(s)
- Parker R Brewster
- Department of Biomedical Engineering, University of Mississippi, University, MS 38677, USA; Department of Chemical Engineering, University of Mississippi, University, MS 38677, USA
| | | | - Glenn M Walker
- Department of Biomedical Engineering, University of Mississippi, University, MS 38677, USA
| | - Thomas A Werfel
- Department of Biomedical Engineering, University of Mississippi, University, MS 38677, USA; Department of Chemical Engineering, University of Mississippi, University, MS 38677, USA; Department of BioMolecular Sciences, University of Mississippi, University, MS 38677, USA; Cancer Center and Research Institute, University of Mississippi Medical Center, Jackson, MS 39216, USA
| |
Collapse
|
2
|
Alarcan H, Guilhaumou R, Quaranta S. Traitements psychiatriques et pharmacogénétique. ACTUALITES PHARMACEUTIQUES 2022. [DOI: 10.1016/j.actpha.2022.03.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
3
|
de Leon J. Commentary on 'tools for optimizing pharmacotherapy in psychiatry (therapeutic drug monitoring, molecular brain imaging and pharmacogenetic tests): focus on antidepressants'. Pharmacogenomics 2021; 22:805-808. [PMID: 34344160 DOI: 10.2217/pgs-2021-0090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Affiliation(s)
- Jose de Leon
- Mental Health Research Center, Eastern State Hospital, Lexington, KY 40511, USA.,Psychiatry & Neurosciences Research Group (CTS-549), Institute of Neurosciences, University of Granada, Granada, Spain.,Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apóstol Hospital, University of the Basque Country, Vitoria, Spain
| |
Collapse
|
4
|
Carvalho Henriques B, Yang EH, Lapetina D, Carr MS, Yavorskyy V, Hague J, Aitchison KJ. How Can Drug Metabolism and Transporter Genetics Inform Psychotropic Prescribing? Front Genet 2020; 11:491895. [PMID: 33363564 PMCID: PMC7753050 DOI: 10.3389/fgene.2020.491895] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Accepted: 09/25/2020] [Indexed: 12/11/2022] Open
Abstract
Many genetic variants in drug metabolizing enzymes and transporters have been shown to be relevant for treating psychiatric disorders. Associations are strong enough to feature on drug labels and for prescribing guidelines based on such data. A range of commercial tests are available; however, there is variability in included genetic variants, methodology, and interpretation. We herein provide relevant background for understanding clinical associations with specific variants, other factors that are relevant to consider when interpreting such data (such as age, gender, drug-drug interactions), and summarize the data relevant to clinical utility of pharmacogenetic testing in psychiatry and the available prescribing guidelines. We also highlight areas for future research focus in this field.
Collapse
Affiliation(s)
| | - Esther H. Yang
- Department of Psychiatry, University of Alberta, Edmonton, AB, Canada
- Department of Medical Genetics, University of Alberta, Edmonton, AB, Canada
| | - Diego Lapetina
- Department of Psychiatry, University of Alberta, Edmonton, AB, Canada
- Department of Medical Genetics, University of Alberta, Edmonton, AB, Canada
| | - Michael S. Carr
- Department of Psychiatry, University of Alberta, Edmonton, AB, Canada
| | - Vasyl Yavorskyy
- Department of Psychiatry, University of Alberta, Edmonton, AB, Canada
| | - Joshua Hague
- Department of Psychiatry, University of Alberta, Edmonton, AB, Canada
- Department of Medical Genetics, University of Alberta, Edmonton, AB, Canada
| | - Katherine J. Aitchison
- Department of Psychiatry, University of Alberta, Edmonton, AB, Canada
- Department of Medical Genetics, University of Alberta, Edmonton, AB, Canada
- Neuroscience and Mental Health Institute, University of Alberta, Edmonton, AB, Canada
| |
Collapse
|
5
|
Bourdon JL, Davies RA, Long EC. Four Actionable Bottlenecks and Potential Solutions to Translating Psychiatric Genetics Research: An Expert Review. Public Health Genomics 2020; 23:171-183. [PMID: 33147585 PMCID: PMC7854816 DOI: 10.1159/000510832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Accepted: 07/27/2020] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Psychiatric genetics has had limited success in translational efforts. A thorough understanding of the present state of translation in this field will be useful in the facilitation and assessment of future translational progress. PURPOSE A narrative literature review was conducted. Combinations of 3 groups of terms were searched in EBSCOhost, Google Scholar, and PubMed. The review occurred in multiple steps, including abstract collection, inclusion/exclusion criteria review, coding, and analysis of included papers. RESULTS One hundred and fourteen articles were analyzed for the narrative review. Across those, 4 bottlenecks were noted that, if addressed, may provide insights and help improve and increase translation in the field of psychiatric genetics. These 4 bottlenecks are emphasizing linear translational frameworks, relying on molecular genomic findings, prioritizing certain psychiatric disorders, and publishing more reviews than experiments. CONCLUSIONS These entwined bottlenecks are examined with one another. Awareness of these bottlenecks can inform stakeholders who work to translate and/or utilize psychiatric genetic information. Potential solutions include utilizing nonlinear translational frameworks as well as a wider array of psychiatric genetic information (e.g., family history and gene-environment interplay) in this area of research, expanding which psychiatric disorders are considered for translation, and when possible, conducting original research. Researchers are urged to consider how their research is translational in the context of the frameworks, genetic information, and psychiatric disorders discussed in this review. At a broader level, these efforts should be supported with translational efforts in funding and policy shifts.
Collapse
Affiliation(s)
- Jessica L Bourdon
- Department of Psychiatry, Brown School of Social Work, Washington University in St. Louis, St. Louis, Missouri, USA,
| | - Rachel A Davies
- Yerkes National Primate Research Center, Division of Behavioral Neuroscience and Psychiatric Disorders, Emory University, Atlanta, Georgia, USA
| | - Elizabeth C Long
- Edna Bennett Pierce Prevention Research Center, Pennsylvania State University, University Park, Pennsylvania, USA
| |
Collapse
|
6
|
de Leon J, Schoretsanitis G. CYP2D6 pharmacogenetics and risperidone: reflections after 25 years of research. Pharmacogenomics 2020; 21:1139-1144. [PMID: 33054667 DOI: 10.2217/pgs-2020-0115] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Affiliation(s)
- Jose de Leon
- Mental Health Research Center, Eastern State Hospital, Lexington, KY 40511, USA.,Psychiatry & Neurosciences Research Group (CTS-549), Institute of Neurosciences, University of Granada, Granada, Spain.,Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apóstol Hospital, University of the Basque Country, Vitoria, Spain
| | | |
Collapse
|
7
|
Lunenburg CATC, Gasse C. Pharmacogenetics in psychiatric care, a call for uptake of available applications. Psychiatry Res 2020; 292:113336. [PMID: 32739644 DOI: 10.1016/j.psychres.2020.113336] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Revised: 07/24/2020] [Accepted: 07/26/2020] [Indexed: 12/27/2022]
Abstract
In this narrative, we evaluate the role of pharmacogenetics in psychiatry from a pragmatic clinical perspective and address current barriers of clinical implementation of pharmacogenetics. Pharmacogenetics has been successfully implemented to improve drug therapy in several clinical areas, but not psychiatry. Yet, psychotropics account for more than one-third of the drugs for which pharmacogenetic guidelines are available and drug therapy in mental disorders is suboptimal with insufficient effectiveness and frequent adverse events. The limited application of pharmacogenetics in psychiatry is influenced by several factors; e.g. the complexity of psychotropic drug metabolism, possibly impeding the clinical understanding of the benefits of pharmacogenetics. Also, recommendations for most psychotropics classify pharmacogenetic testing only as (potentially) beneficial, not as essential, possibly because life-threatening adverse events are often not involved in these drug-gene interactions. Implementing pharmacogenetics in psychiatry could improve the current practice of time-consuming switching of therapies causing undue delays associated with worse outcomes. We expect pharmacogenetics in psychiatry to expedite with panel-based genotyping, including clinically relevant variants, which will address the complex enzymatic metabolism of psychotropic drugs. Until then, we stress that available pharmacogenetic testing should be seen as an integrated companion, not a competitor, in current clinical psychiatric care.
Collapse
Affiliation(s)
- Carin A T C Lunenburg
- Department of Affective Disorders, Aarhus University Hospital Psychiatry, Aarhus, Denmark; Department of Clinical Medicine, Aarhus University, Aarhus, Denmark.
| | - Christiane Gasse
- Department of Affective Disorders, Aarhus University Hospital Psychiatry, Aarhus, Denmark; Department of Clinical Medicine, Aarhus University, Aarhus, Denmark; Psychosis Research Unit, Aarhus University Hospital Psychiatry, Aarhus, Denmark
| |
Collapse
|
8
|
Schoretsanitis G, Spigset O, Stingl JC, Deligiannidis KM, Paulzen M, Westin AA. The impact of pregnancy on the pharmacokinetics of antidepressants: a systematic critical review and meta-analysis. Expert Opin Drug Metab Toxicol 2020; 16:431-440. [PMID: 32238008 DOI: 10.1080/17425255.2020.1750598] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Introduction: Pregnancy-related physiological changes exert a crucial impact on the pharmacokinetics of antidepressants; however, the current evidence presents inconsistencies. A clearer understanding of pregnancy-related effects on antidepressant disposition may facilitate the development of guidelines for appropriate dose adjustments during the course of pregnancy based on therapeutic drug monitoring.Areas covered: We systematically reviewed studies comparing antidepressant levels in the same individuals during pregnant and non-pregnant states. Using dose-adjusted plasma concentration measurements, we estimated alteration ratios between the 3rd trimester and baseline (before or after pregnancy). Additionally, we performed a meta-analysis for changes in dose-adjusted concentrations to estimate mean differences.Expert opinion: Data for several antidepressants display clear alteration patterns during pregnancy. On the basis of the alteration ratios trimipramine, fluvoxamine, and nortriptyline show a prominent decrease in dose-adjusted levels, especially in the 3rd trimester. Clomipramine, imipramine, citalopram, and paroxetine show smaller decreases in dose-adjusted concentrations in the third trimester. For escitalopram, venlafaxine and fluoxetine, changes are considered negligible. For sertraline, there was a tendency toward increased dose-adjusted concentrations in pregnancy. Available evidence suffers from major limitations and factors affecting pharmacokinetics have been insufficiently addressed. Further research is required to promote knowledge on pregnancy effects on antidepressant pharmacokinetics.
Collapse
Affiliation(s)
- Georgios Schoretsanitis
- The Zucker Hillside Hospital, Department of Psychiatry Research, Northwell Health, Glen Oaks, NY, USA
| | - Olav Spigset
- Department of Clinical Pharmacology, St Olav University Hospital, Trondheim, Norway.,Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology, Trondheim, Norway
| | - Julia C Stingl
- Institute of Clinical Pharmacology, University Hospital of RWTH Aachen, Aachen, Germany
| | - Kristina M Deligiannidis
- The Zucker Hillside Hospital, Department of Psychiatry Research, Northwell Health, Glen Oaks, NY, USA.,Zucker School of Medicine, Hempstead, New York, Manhasset, New York, USA.,The Feinstein Institutes for Medical Research, Manhasset, NY, USA
| | - Michael Paulzen
- Alexianer Hospital Aachen, Aachen, Germany and Department of Psychiatry, Psychotherapy and Psychosomatics, RWTH Aachen University, and JARA - Translational Brain Medicine, Aachen, Germany
| | - Andreas A Westin
- Department of Clinical Pharmacology, St Olav University Hospital, Trondheim, Norway
| |
Collapse
|
9
|
De las Cuevas C, de Leon J. Self-Report for Measuring and Predicting Medication Adherence: Experts' Experience in Predicting Adherence in Stable Psychiatric Outpatients and in Pharmacokinetics. Patient Prefer Adherence 2020; 14:1823-1842. [PMID: 33116427 PMCID: PMC7555336 DOI: 10.2147/ppa.s242693] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Accepted: 09/25/2020] [Indexed: 12/18/2022] Open
Abstract
THE PROBLEM Poor adherence to appropriately prescribed medication is a global challenge for psychiatrists. PRIOR STUDIES Measuring adherence is complicated. In our recent three-country naturalistic study including more than 1000 patients and their adherence to multiple medication prescriptions at the same time, patients' self-report of adherence to each specific drug was the only practical option for measuring adherence. Systematic literature reviews provide inconsistent results for sociodemographic, clinical and medication variables as predictors of adherence to psychiatric drugs. Our studies over the last 10 years in relatively stable psychiatric outpatients have shown that some self-reported health beliefs had consistent, strong effects and a better predictive role. Three dimensions of these health beliefs are characteristics of the individual: 1) attitudes toward psychiatric medication such as pharmacophobia (fear of taking drugs or medicines), 2) health locus of control (the belief patients have about who or what agent determines the state of their health), 3) psychological reactance (an emotional reaction in direct contradiction to rules or regulations that threaten or suppress certain freedoms in behavior). They can be measured by the Patient Health Beliefs Questionnaire on Psychiatric Treatment. The attitude toward each specific medication can be measured by the necessity-concern framework and summarized as the presence or absence of skepticism about that drug. After 25 years conducting pharmacokinetic studies in psychiatric drugs, particularly antipsychotics, we have limited understanding of how to use blood levels to predict the effects of non-adherence or to establish it. EXPERT OPINION ON FUTURE STUDIES Future studies to predict adherence should include the inpatient setting and explore insight. Studying the pharmacokinetics associated with non-adherence in each psychiatric drug is a major challenge. Medication adherence is a complex and dynamic process changing over time in the same patient. Personalizing adherence using psychological or pharmacological variables are in their initial stages.
Collapse
Affiliation(s)
- Carlos De las Cuevas
- Department of Internal Medicine, Dermatology and Psychiatry, University of La Laguna, San Cristóbal de La Laguna, Canary Islands, Spain
- Instituto Universitario de Neurociencia (IUNE), Universidad de La Laguna, San Cristóbal de La Laguna, Spain
- Correspondence: Carlos De las CuevasDepartment of Internal Medicine, Dermatology and Psychiatry, Universidad de La Laguna,, Campus de Ofra s/n, San Cristóbal de La Laguna, Canary Islands, SpainTel +34-922-316502Fax +34-922-319353 Email
| | - Jose de Leon
- Mental Health Research Center at Eastern State Hospital, Lexington, KY, USA
- Psychiatry and Neurosciences Research Group (CTS-549), Institute of Neurosciences, University of Granada, Granada, Spain
- Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apóstol Hospital, University of the Basque Country, Vitoria, Spain
| |
Collapse
|
10
|
de Leon J. Personalizing dosing of risperidone, paliperidone and clozapine using therapeutic drug monitoring and pharmacogenetics. Neuropharmacology 2019; 168:107656. [PMID: 31150659 DOI: 10.1016/j.neuropharm.2019.05.033] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Revised: 05/17/2019] [Accepted: 05/27/2019] [Indexed: 12/18/2022]
Abstract
By combining knowledge of pharmacogenetics, therapeutic drug monitoring (TDM) and drug-drug interactions (DDIs) the author developed a model for personalizing antipsychotic dosing, which is applied to risperidone, 9-hydroxyrisperidone or paliperidone, and clozapine. Drugs are approved using an average dose for an ideal average patient, but pharmacologists have described outliers: genetic poor metabolizers (PMs) and ultrarapid metabolizers (UMs). Environmental and personal variables can also make patients behave as PMs or UMs. Drug clearance is represented by the concentration-to-dose (C/D) ratio under steady-state and trough conditions. A very low C/D ratio indicates a UM, while a very high C/D ratio indicates a PM. Total risperidone C/D ratio for the oral formulation is around 7 ng/ml per mg/day and can be influenced by CYP2D6 polymorphism, DDIs with inducers and inhibitors, and renal function. Oral paliperidone has low availability; its C/D ratio is around 4.1 ng/ml per mg/d and can be influenced by inducers and renal impairment. Once-a-month long-acting paliperidone provides a C/D ratio around 7.7 ng/ml per mg/day at steady state, which is expected to be in the 8th month (before the 9th injection). TDM is particularly important for long-acting paliperidone formulations that may accumulate once steady state is reached (after years for the 3- and 6-month formulations). In the US, clozapine C/D ratios typically range from 0.6 (male smokers) to 1.2 (female non-smokers) ng/ml per mg/day. East Asians' clozapine C/D ratios appear to be twice as high. Inhibitors (including fluvoxamine and oral contraceptives) and inflammation can also increase clozapine C/D ratios. This article is part of the issue entitled 'Special Issue on Antipsychotics'.
Collapse
Affiliation(s)
- Jose de Leon
- University of Kentucky Mental Health Research Center at Eastern State Hospital, Lexington, KY, USA; Psychiatry and Neurosciences Research Group (CTS-549), Institute of Neurosciences, University of Granada, Granada, Spain; Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apostol Hospital, University of the Basque Country, Vitoria, Spain.
| |
Collapse
|
11
|
Pharmacokinetics of venlafaxine in treatment responders and non-responders: a retrospective analysis of a large naturalistic database. Eur J Clin Pharmacol 2019; 75:1109-1116. [DOI: 10.1007/s00228-019-02675-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2018] [Accepted: 03/27/2019] [Indexed: 12/19/2022]
|
12
|
Fountoulakis KN, Moeller HJ, Kasper S. Personalised and precision psychiatry: what do the CINP bipolar guidelines suggest? Int J Psychiatry Clin Pract 2019; 23:80-81. [PMID: 29764259 DOI: 10.1080/13651501.2018.1470246] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Affiliation(s)
- Konstantinos N Fountoulakis
- a Department of Psychiatry , School of Medicine Aristotle University of Thessaloniki Greece , Thessaloniki , Greece
| | - Hans Jurgen Moeller
- b Department of Psychiatric , Ludwig Maximilians University Munich , Munich , Germany
| | - Siegfried Kasper
- c Department of Psychiatry and Psychotherapy , Medical University Vienna, MUV, AKH , Währinger Gürtel, Vienna , Austria
| |
Collapse
|
13
|
Singh DB. The Impact of Pharmacogenomics in Personalized Medicine. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2019; 171:369-394. [PMID: 31485703 DOI: 10.1007/10_2019_110] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Recent advances in Pharmacogenomics have made it possible to understand the reasons behind the different response of a drug. Discovery of genetic variants and its association with the varying response of drug provide the basis for recommending a drug and its dose to an individual patient. Genetic makeup-based prescription, design, and implementation of therapy not only improve the outcome of treatments but also reduce the risk of toxicity and other adverse effects. A better understanding of individual variations and their effect on drug response, metabolism excretion, and toxicity will replace the trial-and-error approach of treatment. Evidence of the clinical utility of pharmacogenetics testing is only available for a few medications, and FDA labels only require pharmacogenetics testing for a small number of drugs. Although there is a great promise, there are not many examples where Pharmacogenomics impacts clinical utility. Some genetic variants related to different diseases have been reported, and many have not been studied yet. The information related to the outcome of treatment with a particular drug and a genetic variant can be used to release a warning/label for the use of that drug. There are many limitations in the way of implementing the goal of personalized medicine. Future advances in the field of genomics, diagnosis approaches, data analysis, clinical decision-making, and sustainable business model for personalization of therapy can speed up the individualization of therapy based on genetic makeup.
Collapse
Affiliation(s)
- Dev Bukhsh Singh
- Department of Biotechnology, Institute of Biosciences and Biotechnology, Chhatrapati Shahu Ji Maharaj University, Kanpur, Uttar Pradesh, India.
| |
Collapse
|
14
|
Dong AN, Tan BH, Pan Y, Ong CE. Cytochrome P450 genotype-guided drug therapies: An update on current states. Clin Exp Pharmacol Physiol 2018; 45:991-1001. [PMID: 29858511 DOI: 10.1111/1440-1681.12978] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2018] [Revised: 05/30/2018] [Accepted: 05/30/2018] [Indexed: 01/07/2023]
Abstract
Over the past 2 decades, knowledge of the role and clinical value of pharmacogenetic markers has expanded so that individualized pre-emptive therapy based on genetic background of patients could be within reach for clinical implementation. This is evidenced from the frequent updating of drug labels that incorporates pharmacogenetic information (where compelling data become available) by the regulatory agencies (such as the US FDA), and the periodical publication of guidelines of specific therapeutic recommendations based on the results of pharmacogenetic tests by the pharmacogenetics working groups or consortiums of professional bodies. Clinical relevance of the cytochrome P450 (CYP) polymorphism related to dose, effectiveness and/or toxicity of key drugs are presented in this review, including that of warfarin, clopidogrel, tricyclic antidepressants, and proton pump inhibitors. Prospect for routine clinical application of CYP genotyping before prescribing drugs is still currently unclear due to challenges and barriers associated with availability of well-defined and validated pharmacogenetic studies, the interpretation, result reporting and potential error of genotype testing, involvement of non-genetic factors, and other patient's demographic and disease conditions. Further studies to provide additional supporting clinical data and acceleration of pharmacogenetic testing standards and techniques should help improve the evidence base needed for clinical utility and hence move the implementation of genotype-guided therapy in clinical practice a step closer to reality.
Collapse
Affiliation(s)
- Amelia Nathania Dong
- School of Pharmacy, Monash University Malaysia, Bandar Sunway, Selangor, Malaysia
| | - Boon Hooi Tan
- Division of Applied Biomedical Sciences and Biotechnology, International Medical University, Kuala Lumpur, Malaysia
| | - Yan Pan
- Department of Biomedical Science, University of Nottingham Malaysia Campus, Semenyih, Selangor, Malaysia
| | - Chin Eng Ong
- School of Pharmacy, International Medical University, Kuala Lumpur, Malaysia
| |
Collapse
|
15
|
Schoretsanitis G, Spina E, Hiemke C, de Leon J. A systematic review and combined analysis of therapeutic drug monitoring studies for oral paliperidone. Expert Rev Clin Pharmacol 2018; 11:625-639. [DOI: 10.1080/17512433.2018.1478727] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Georgios Schoretsanitis
- University Hospital of Psychiatry, Bern, Switzerland
- Department of Psychiatry, Psychotherapy and Psychosomatics, and JARA – Translational Brain Medicine, RWTH Aachen University, Aachen, Germany
| | - Edoardo Spina
- Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy
| | - Christoph Hiemke
- Department of Psychiatry and Psychotherapy, University Medical Center of Mainz, Mainz, Germany
| | - Jose de Leon
- University of Kentucky Mental Health Research Center at Eastern State Hospital, Lexington, KY, USA
- Psychiatry and Neurosciences Research Group (CTS-549), Institute of Neurosciences, University of Granada, Granada, Spain
- Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apostol Hospital, University of the Basque Country, Vitoria, Spain
| |
Collapse
|
16
|
Schoretsanitis G, Paulzen M, Unterecker S, Schwarz M, Conca A, Zernig G, Gründer G, Haen E, Baumann P, Bergemann N, Clement HW, Domschke K, Eckermann G, Egberts K, Gerlach M, Greiner C, Havemann-Reinecke U, Hefner G, Helmer R, Janssen G, Jaquenoud-Sirot E, Laux G, Messer T, Mössner R, Müller MJ, Pfuhlmann B, Riederer P, Saria A, Schoppek B, Silva Gracia M, Stegmann B, Steimer W, Stingl JC, Uhr M, Ulrich S, Waschgler R, Zurek G, Hiemke C. TDM in psychiatry and neurology: A comprehensive summary of the consensus guidelines for therapeutic drug monitoring in neuropsychopharmacology, update 2017; a tool for clinicians<sup/>. World J Biol Psychiatry 2018; 19:162-174. [PMID: 29493375 DOI: 10.1080/15622975.2018.1439595] [Citation(s) in RCA: 80] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
OBJECTIVES Therapeutic drug monitoring (TDM) combines the quantification of drug concentrations in blood, pharmacological interpretation and treatment guidance. TDM introduces a precision medicine tool in times of increasing awareness of the need for personalized treatment. In neurology and psychiatry, TDM can guide pharmacotherapy for patient subgroups such as children, adolescents, pregnant women, elderly patients, patients with intellectual disabilities, patients with substance use disorders, individuals with pharmacokinetic peculiarities and forensic patients. Clear indications for TDM include lack of clinical response in the therapeutic dose range, assessment of drug adherence, tolerability issues and drug-drug interactions. METHODS Based upon existing literature, recommended therapeutic reference ranges, laboratory alert levels, and levels of recommendation to use TDM for dosage optimization without specific indications, conversion factors, factors for calculation of dose-related drug concentrations and metabolite-to-parent ratios were calculated. RESULTS This summary of the updated consensus guidelines by the TDM task force of the Arbeitsgemeinschaft für Neuropsychopharmakologie und Pharmakopsychiatrie offers the practical and theoretical knowledge for the integration of TDM as part of pharmacotherapy with neuropsychiatric agents into clinical routine. CONCLUSIONS The present guidelines for TDM application for neuropsychiatric agents aim to assist clinicians in enhancing safety and efficacy of treatment.
Collapse
Affiliation(s)
- Georgios Schoretsanitis
- a Department of Psychiatry , University of Bern , Bern , Switzerland.,b Department of Psychiatry, Psychotherapy and Psychosomatics , RWTH Aachen University, JARA - Translational Brain Medicine , Aachen , Germany
| | - Michael Paulzen
- b Department of Psychiatry, Psychotherapy and Psychosomatics , RWTH Aachen University, JARA - Translational Brain Medicine , Aachen , Germany.,c Alexianer Hospital Aachen , Aachen , Germany
| | - Stefan Unterecker
- d Department of Psychiatry, Psychosomatics and Psychotherapy , University Hospital of Würzburg , Germany
| | - Markus Schwarz
- e Department of Laboratory Medicine , Ludwig Maximilian University , Munich , Germany
| | - Andreas Conca
- f Servizio Psichiatrico del Comprensorio Sanitario di Bolzano , Bolzano , Italy
| | - Gerald Zernig
- g Experimental Psychiatry Unit, Department of Psychiatry and Psychotherapy , Medical University of Innsbruck , Innsbruck , Austria.,h Private Practice for Psychotherapy and Court-Certified Witness , Hall in Tirol , Austria
| | - Gerhard Gründer
- i Department of Molecular Neuroimaging , Central Institute of Mental Health, Medical Faculty Mannheim, University of Heidelberg , Mannheim , Germany
| | - Ekkerhard Haen
- j Clinical Pharmacology, Department of Psychiatry and Psychotherapy and Department of Pharmacology and Toxicology , University of Regensburg , Regensburg , Germany
| | - Pierre Baumann
- k Department of Psychiatry , University of Lausanne , Lausanne , Switzerland
| | - Niels Bergemann
- l Kitzberg Hospitals, Center for Psychosomatic Medicine and Psychotherapy , Bad Mergentheim , Germany
| | - Hans Willi Clement
- m Department of Child and Adolescent Psychiatry , University of Freiburg , Freiburg , Germany
| | - Katharina Domschke
- n Department of Psychiatry and Psychotherapy , Medical Center-University of Freiburg, Faculty of Medicine, University of Freiburg , Freiburg , Germany
| | | | - Karin Egberts
- p Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy , Center of Mental Health, University Hospital of Würzburg , Germany
| | - Manfred Gerlach
- p Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy , Center of Mental Health, University Hospital of Würzburg , Germany
| | - Christine Greiner
- q Federal Institute for Drugs and Medical Devices (BfArM) , Bonn , Germany
| | | | - Gudrun Hefner
- s Psychiatric Hospital, Vitos Klinik Hochtaunus , Friedrichsdorf , Germany
| | | | - Ger Janssen
- u Medical Laboratory Stein , Limbach Group , Mönchengladbach , Germany
| | | | - Gerd Laux
- w Institute of Psychological Medicine , Haag in Oberbayern , Germany
| | - Thomas Messer
- x Danuviuskliniken, Psychiatric Hospital , Pfaffenhofen , Germany
| | - Rainald Mössner
- y Department of Psychiatry and Psychotherapy , University of Tübingen , Tübingen , Germany
| | | | | | - Peter Riederer
- d Department of Psychiatry, Psychosomatics and Psychotherapy , University Hospital of Würzburg , Germany
| | - Alois Saria
- g Experimental Psychiatry Unit, Department of Psychiatry and Psychotherapy , Medical University of Innsbruck , Innsbruck , Austria
| | - Bernd Schoppek
- ab kbo-Isar-Amper Klinikum München-Ost, Psychiatric Hospital , Munich , Germany
| | - Margarete Silva Gracia
- j Clinical Pharmacology, Department of Psychiatry and Psychotherapy and Department of Pharmacology and Toxicology , University of Regensburg , Regensburg , Germany
| | - Benedikt Stegmann
- j Clinical Pharmacology, Department of Psychiatry and Psychotherapy and Department of Pharmacology and Toxicology , University of Regensburg , Regensburg , Germany
| | - Werner Steimer
- ac Institute of Clinical Chemistry and Pathobiochemistry, Technical University Munich , Munich , Germany
| | - Julia C Stingl
- q Federal Institute for Drugs and Medical Devices (BfArM) , Bonn , Germany
| | - Manfred Uhr
- ad Max Planck Institute of Psychiatry , Munich , Germany
| | | | | | | | - Christoph Hiemke
- ah Department of Psychiatry and Psychotherapy , University Medical Center of Mainz , Mainz , Germany.,ai Institute of Clinical Chemistry and Laboratory Medicine , University Medical Center of Mainz , Mainz , Germany
| |
Collapse
|
17
|
Ovenden ES, McGregor NW, Emsley RA, Warnich L. DNA methylation and antipsychotic treatment mechanisms in schizophrenia: Progress and future directions. Prog Neuropsychopharmacol Biol Psychiatry 2018; 81:38-49. [PMID: 29017764 DOI: 10.1016/j.pnpbp.2017.10.004] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Revised: 10/01/2017] [Accepted: 10/04/2017] [Indexed: 12/15/2022]
Abstract
Antipsychotic response in schizophrenia is a complex, multifactorial trait influenced by pharmacogenetic factors. With genetic studies thus far providing little biological insight or clinical utility, the field of pharmacoepigenomics has emerged to tackle the so-called "missing heritability" of drug response in disease. Research on psychiatric disorders has only recently started to assess the link between epigenetic alterations and treatment outcomes. DNA methylation, the best characterised epigenetic mechanism to date, is discussed here in the context of schizophrenia and antipsychotic treatment outcomes. The majority of published studies have assessed the influence of antipsychotics on methylation levels in specific neurotransmitter-associated candidate genes or at the genome-wide level. While these studies illustrate the epigenetic modifications associated with antipsychotics, very few have assessed clinical outcomes and the potential of differential DNA methylation profiles as predictors of antipsychotic response. Results from other psychiatric disorder studies, such as depression and bipolar disorder, provide insight into what may be achieved by schizophrenia pharmacoepigenomics. Other aspects that should be addressed in future research include methodological challenges, such as tissue specificity, and the influence of genetic variation on differential methylation patterns.
Collapse
Affiliation(s)
- Ellen S Ovenden
- Department of Genetics, Stellenbosch University, Stellenbosch 7600, South Africa
| | - Nathaniel W McGregor
- Department of Genetics, Stellenbosch University, Stellenbosch 7600, South Africa
| | - Robin A Emsley
- Department of Psychiatry, Stellenbosch University, Tygerberg 7505, South Africa
| | - Louise Warnich
- Department of Genetics, Stellenbosch University, Stellenbosch 7600, South Africa.
| |
Collapse
|
18
|
Abstract
SummaryUp to a third of patients with schizophrenia develop treatment resistance. Clozapine has been established as the most effective antipsychotic medication for treatment-resistant schizophrenia. However, it is significantly underutilised in this population. Possible reasons include clinicians' lack of experience with the drug and negative attitudes towards it. African-Caribbean patients are less likely to be treated with clozapine compared with their White counterparts and more likely to have treatment discontinued due to perceived risk of agranulocytosis. This paper discusses the current evidence relating to the underuse of clozapine and factors responsible for this.
Collapse
|
19
|
Modak AS. Point-of-care companion diagnostic tests for personalizing psychiatric medications: fulfilling an unmet clinical need. J Breath Res 2017; 12:017101. [PMID: 28920579 DOI: 10.1088/1752-7163/aa8d2e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Over the last decade stable isotope-labeled substrates have been used as probes for rapid, point-of-care, non-invasive and user-friendly phenotype breath tests to evaluate activity of drug metabolizing enzymes. These diagnostic breath tests can potentially be used as companion diagnostics by physicians to personalize medications, especially psychiatric drugs with narrow therapeutic windows, to monitor the progress of disease severity, medication efficacy and to study in vivo the pharmacokinetics of xenobiotics. Several genotype tests have been approved by the FDA over the last 15 years for both cytochrome P450 2D6 and 2C19 enzymes, however they have not been cleared for use in personalizing medications since they fall woefully short in identifying all non-responders to drugs, especially for the CYP450 enzymes. CYP2D6 and CYP2C19 are among the most extensively studied drug metabolizing enzymes, involved in the metabolism of approximately 30% of FDA-approved drugs in clinical use, associated with large individual differences in medication efficacy or tolerability essentially due to phenoconversion. The development and commercialization via FDA approval of the non-invasive, rapid (<60 min), in vivo, phenotype diagnostic breath tests to evaluate polymorphic CYP2D6 and CYP2C19 enzyme activity by measuring exhaled 13CO2 as a biomarker in breath will effectively resolve the currently unmet clinical need for individualized psychiatric drug therapy. Clinicians could personalize treatment options for patients based on the CYP2D6 and CYP2C19 phenotype by selecting the optimal medication at the right initial and subsequent maintenance dose for the desired clinical outcome (i.e. greatest efficacy and minimal side effects).
Collapse
Affiliation(s)
- Anil S Modak
- Cambridge Isotope Laboratories, Inc., 3 Highwood Drive, Tewksbury, MA 01876, United States of America
| |
Collapse
|
20
|
Eap CB. Personalized prescribing: a new medical model for clinical implementation of psychotropic drugs. DIALOGUES IN CLINICAL NEUROSCIENCE 2017. [PMID: 27757065 PMCID: PMC5067148 DOI: 10.31887/dcns.2016.18.3/ceap] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The use of pharmacogenetic tests was already being proposed in psychiatry in the early 2000s because genetic factors were known to influence drug pharmacokinetics and pharmacodynamics. However, sufficient levels of evidence to justify routine use have been achieved for only a few tests (eg, major histocompatibility complex, class I, B, allele 1502 [HLA-B*1502] for carbamazepine in epilepsy and bipolar disorders); many findings are too preliminary or, when replicated, of low clinical relevance because of a small effect size. Although drug selection and dose adaptation according to cytochrome P450 genotypes are sound, a large number of patients need to be genotyped in order to prevent one case of severe side effect and/or nonresponse. The decrease in cost for genetic analysis shifts the cost: benefit ratio toward increasing use of pharmacogenetic tests. However, they have to be combined with careful clinical evaluations and other tools (eg, therapeutic drug monitoring and phenotyping) to contribute to the general aim of providing the best care for psychiatric patients.
Collapse
Affiliation(s)
- Chin B Eap
- Unit of Pharmacogenetics and Clinical Psychopharmacology, Centre for Psychiatric Neurosciences, Department of Psychiatry, Lausanne University Hospital, Prilly, Switzerland; School of Pharmacy, Department of Pharmaceutical Sciences, University of Geneva, University of Lausanne, Geneva, Switzerland
| |
Collapse
|
21
|
Abstract
PURPOSE/BACKGROUND This commentary deals with the neglected issue of the art of psychopharmacology by recounting the authors' journeys. METHODS/PROCEDURES First, a model of medical science situated within the history of medicine is described including (1) a limitation of the mathematical model of science, (2) the distinction between mechanistic science and mathematical science, (3) how this distinction is applied to medicine, and (4) how this distinction is applied to explain pharmacology to psychiatrists. Second, the neglected art of psychopharmacology is addressed by explaining (1) where the art of psychopharmacotherapy was hiding in the first author's psychopharmacology research, (2) how the Health Belief Model was applied to the art of medicine, (3) how the second author became interested in the Health Belief Model, and (4) his studies introducing the Health Belief Model in psychopharmacology. The authors' collaboration led to: (1) study of the effect of pharmacophobia on poor adherence and (2) reflection on the limits of the art of psychopharmacology. FINDINGS/RESULTS Low adherence was found in 45% (116/258) of psychiatric patients with pharmacophobia versus 22% (149/682) in those with no pharmacophobia, providing an odds ratio of 2.9 (95% confidence interval, 2.2-4.0) and an adjusted odds ratio of 2.5 (95% confidence interval, 1.8-3.5) after adjusting for other variables contributing to poor adherence. IMPLICATIONS/CONCLUSIONS Different cognitive patterns in different patients may contribute to poor adherence. Specific interventions targeting these varying cognitive styles may be needed in different patients to improve drug adherence.
Collapse
|
22
|
De Las Cuevas C, de Leon J. Reviving Research on Medication Attitudes for Improving Pharmacotherapy: Focusing on Adherence. PSYCHOTHERAPY AND PSYCHOSOMATICS 2017; 86:73-79. [PMID: 28183085 DOI: 10.1159/000450830] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 09/14/2016] [Indexed: 12/20/2022]
Abstract
There is little current interest in research into patients' attitudes toward medications. In the 1960s, psychiatric researchers including Uhlenhuth, Rickels and Covi focused on this area, but this research topic needs to be revived in the 21st century. The Health Belief Model may hold potential for doing this. This model was initially developed by 2 health psychologists, Rosenstock and Becker, to explain why patients did not follow medical interventions. The application of this model to study medication adherence in psychiatric outpatients has provided multiple findings including the conclusions that adherence is associated with: (1) the balance between internal and external health control beliefs, (2) psychological reactance, (3) patients' attitudes toward prescribed drug treatment in general and (4) the balance between the necessity of taking medications versus the concerns derived from adverse drug reactions (ADRs). Poor adherence is associated with several cognitive styles of patients, including: (1) high internal and external health control beliefs (patients who feel that their health is controlled both by external factors and their own beliefs), (2) higher psychological reactance, (3) pharmacophobia (present in 1/6 patients) and (4) skepticism about medications (a high concern for ADRs and a low belief in the necessity of taking medications). All of these findings suggest that shared decision-making is particularly important in fostering adherence in psychiatric patients. Two wider applications of this article can be made: (1) opening psychiatry to advances in clinical psychology and (2) expanding studies on attitudes toward medications to other medical disciplines.
Collapse
|
23
|
Schütze G, Schwarz MJ. Therapeutic Drug Monitoring for individualised risk reduction in psychopharmacotherapy. Trends Analyt Chem 2016. [DOI: 10.1016/j.trac.2016.05.027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
24
|
Stephens DB, de Leon J. CYP2D6 ultra-rapid metabolizer phenotype not associated with attempted suicide in a large sample of psychiatric inpatients. Pharmacogenomics 2016; 17:1295-304. [PMID: 27463022 DOI: 10.2217/pgs-2016-0086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
AIM Suicide accounts for over 800,000 deaths per year worldwide and is the tenth-leading cause of mortality in USA. Several studies have investigated cytochrome P450 CYP2D6 ultra-rapid metabolizer (UM) phenotype in relation to suicidality, with mixed results. This study tested the hypothesis of increased suicide risk among CYP2D6 UMs. PATIENTS & METHODS Among the 4264 state psychiatric hospital inpatients included, 2435 (57%) reported a prior suicide attempt. RESULTS No association between UM status and attempted suicide was observed in bivariate (odds ratio: 0.87; 95% CI: 0.53-1.25), multivariate (adjusted odds ratio: 0.89; 95% CI: 0.55-1.46), or risk-stratified analyses. CONCLUSION These results contrast with prior reports of increased suicidality among CYP2D6 UMs and highlight the pressing need to identify reliable screening methods to better address this persistent public health problem.
Collapse
Affiliation(s)
- Dustin B Stephens
- Department of Behavioral Science, University of Kentucky College of Medicine, Lexington, KY, USA
| | - Jose de Leon
- Department of Psychiatry, University of Kentucky College of Medicine, Lexington, KY, USA
| |
Collapse
|
25
|
de Leon J, Spina E. What is needed to incorporate clinical pharmacogenetic tests into the practice of psychopharmacotherapy? Expert Rev Clin Pharmacol 2015; 9:351-4. [DOI: 10.1586/17512433.2016.1112737] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
26
|
de Leon J. Phenoconversion and therapeutic drug monitoring. Br J Clin Pharmacol 2015; 80:777-8. [PMID: 25881716 DOI: 10.1111/bcp.12659] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Revised: 04/08/2015] [Accepted: 04/10/2015] [Indexed: 12/26/2022] Open
Affiliation(s)
- Jose de Leon
- University of Kentucky, Mental Health Research Center, Eastern State Hospital, Lexington, KY, USA.,Psychiatry and Neurosciences Research Group (CTS-549), Institute of Neurosciences, University of Granada, Granada, Spain.,Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apóstol Hospital, University of the Basque Country, Vitoria, Spain
| |
Collapse
|
27
|
de Leon J. Translating Pharmacogenetics to Clinical Practice: Do Cytochrome P450 2D6 Ultrarapid Metabolizers Need Higher Atomoxetine Doses? J Am Acad Child Adolesc Psychiatry 2015; 54:532-4. [PMID: 26088654 DOI: 10.1016/j.jaac.2015.04.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Revised: 03/21/2015] [Accepted: 04/22/2015] [Indexed: 11/29/2022]
Affiliation(s)
- Jose de Leon
- University of Kentucky Mental Health Research Center at Eastern State Hospital, Lexington; Psychiatry and Neurosciences Research Group (CTS-549), Institute of Neurosciences, University of Granada, Granada, Spain; Biomedical Research Center in Mental Health Net (CIBERSAM), Santiago Apóstol Hospital, University of the Basque Country, Vitoria, Spain.
| |
Collapse
|
28
|
Shishko I, Almeida K, Silvia RJ, Tataronis GR. Psychiatric pharmacists' perception on the use of pharmacogenomic testing in the mental health population. Pharmacogenomics 2015; 16:949-58. [PMID: 26100610 DOI: 10.2217/pgs.15.22] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
AIM Pharmacogenomics could play a role in improving patient care, reducing adverse drug reactions and overall healthcare costs. However, whether it is utilized may be determined by how it is perceived by healthcare professionals, including pharmacists. METHODS A cross-sectional web-based survey evaluated psychiatric pharmacists' use, knowledge and perception of the effectiveness of such testing. RESULTS Among participants, 80% worked at sites not offering pharmacogenomic testing, mostly due to a lack of funding. About 36% of pharmacists considered themselves more knowledgeable and 47% considered themselves less knowledgeable about pharmacogenomic testing; however, most agreed on the potential usefulness of testing. CONCLUSION Among psychiatric pharmacists, the use of pharmacogenomics appears underappreciated due to factors such as lack of availability and understanding of testing. Original submitted 26 November 2014; Revision submitted 13 February 2015.
Collapse
Affiliation(s)
- Ilona Shishko
- MCPHS University, School of Pharmacy - Boston, 179 Longwood Avenue, Boston, MA 02115, USA
| | - Kenneth Almeida
- MCPHS University, School of Pharmacy - Boston, 179 Longwood Avenue, Boston, MA 02115, USA
| | - Richard J Silvia
- MCPHS University, School of Pharmacy - Boston, 179 Longwood Avenue, Boston, MA 02115, USA
| | - Gary R Tataronis
- MCPHS University, School of Pharmacy - Boston, 179 Longwood Avenue, Boston, MA 02115, USA
| |
Collapse
|
29
|
Abstract
Forgetting history, which frequently repeats itself, is a mistake. In General Psychopathology, Jaspers criticised early 20th century psychiatrists, including those who thought psychiatry was only neurology (Wernicke) or only abnormal psychology (Freud), or who did not see the limitations of the medical model in psychiatry (Kraepelin). Jaspers proposed that some psychiatric disorders follow the medical model (Group I), while others are variations of normality (Group III), or comprise schizophrenia and severe mood disorders (Group II). In the early 21st century, the players' names have changed but the game remains the same. The US NIMH is reprising both Wernicke's brain mythology and Kraepelin's marketing promises. The neo-Kraepelinian revolution started at Washington University, became pre-eminent through the DSM-III developed by Spitzer, but reached a dead end with the DSM-5. McHugh, who described four perspectives in psychiatry, is the leading contemporary representative of the Jaspersian diagnostic approach. Other neo-Jaspersians are: Berrios, Wiggins and Schwartz, Ghaemi, Stanghellini, Parnas and Sass. Can psychiatry learn from its mistakes? The current psychiatric language, organised at its three levels, symptoms, syndromes, and disorders, was developed in the 19th century but is obsolete for the 21st century. Scientific advances in Jaspers' Group III disorders require collaborating with researchers in the social and psychological sciences. Jaspers' Group II disorders, redefined by the author as schizophrenia, catatonic syndromes, and severe mood disorders, are the core of psychiatry. Scientific advancement in them is not easy because we are not sure how to delineate between and within them correctly.
Collapse
|
30
|
The effects of antiepileptic inducers in neuropsychopharmacology, a neglected issue. Part I: A summary of the current state for clinicians. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.rpsmen.2015.04.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
31
|
The effects of antiepileptic inducers in neuropsychopharmacology, a neglected issue. Part I: A summary of the current state for clinicians. REVISTA DE PSIQUIATRIA Y SALUD MENTAL 2015; 8:97-115. [PMID: 25745819 DOI: 10.1016/j.rpsm.2014.10.006] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Accepted: 10/23/2014] [Indexed: 12/18/2022]
Abstract
The literature on inducers in epilepsy and bipolar disorder is seriously contaminated by false negative findings. This is part i of a comprehensive review on antiepileptic drug (AED) inducers using both mechanistic pharmacological and evidence-based medicine to provide practical recommendations to neurologists and psychiatrists concerning how to control for them. Carbamazepine, phenobarbital and phenytoin, are clinically relevant AED inducers; correction factors were calculated for studied induced drugs. These correction factors are rough simplifications for orienting clinicians, since there is great variability in the population regarding inductive effects. As new information is published, the correction factors may need to be modified. Some of the correction factors are so high that the drugs (e.g., bupropion, quetiapine or lurasidone) should not co-prescribed with potent inducers. Clobazam, eslicarbazepine, felbamate, lamotrigine, oxcarbazepine, rufinamide, topiramate, vigabatrin and valproic acid are grouped as mild inducers which may (i)be inducers only in high doses; (ii)frequently combine with inhibitory properties; and (iii)take months to reach maximum effects or de-induction, definitively longer than the potent inducers. Potent inducers, definitively, and mild inducers, possibly, have relevant effects in the endogenous metabolism of (i)sexual hormones, (ii) vitamin D, (iii)thyroid hormones, (iv)lipid metabolism, and (v)folic acid.
Collapse
|
32
|
Focusing on drug versus disease mechanisms and on clinical subgrouping to advance personalised medicine in psychiatry. Acta Neuropsychiatr 2014; 26:327-33. [PMID: 25455256 DOI: 10.1017/neu.2014.14] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Personalised medicine has finally been featured in psychiatric journals, but psychiatrists have mainly focused on the promise of using disease mechanisms to personalise treatment. Psychiatric disorders such as schizophrenia and depression are not diseases, in the medical sense, and are probably more like syndromes. Instead of spending much time and effort focusing on the mechanisms of diseases that may instead be syndromes, the author believes that psychiatrists should (1) learn more about personalising prescription via drug mechanisms, a pharmacological approach to personalised medicine; and (2) reconsider prior attempts by traditional clinical psychopharmacologists to use sophisticated clinical approaches that try to subdivide psychiatric syndromes into groups that may be more homogenous for treatment response.
Collapse
|
33
|
Paradoxes of US psychopharmacology practice in 2013: undertreatment of severe mental illness and overtreatment of minor psychiatric problems. J Clin Psychopharmacol 2014; 34:545-8. [PMID: 24781438 DOI: 10.1097/jcp.0000000000000126] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
|
34
|
Spina E, de Leon J. Clinical applications of CYP genotyping in psychiatry. J Neural Transm (Vienna) 2014; 122:5-28. [DOI: 10.1007/s00702-014-1300-5] [Citation(s) in RCA: 103] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Accepted: 08/18/2014] [Indexed: 12/13/2022]
|
35
|
Telemonitoring with respect to mood disorders and information and communication technologies: overview and presentation of the PSYCHE project. BIOMED RESEARCH INTERNATIONAL 2014; 2014:104658. [PMID: 25050321 PMCID: PMC4094725 DOI: 10.1155/2014/104658] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Revised: 06/04/2014] [Accepted: 06/08/2014] [Indexed: 12/15/2022]
Abstract
This paper reviews what we know about prediction in relation to mood disorders from the perspective of clinical, biological, and physiological markers. It then also presents how information and communication technologies have developed in the field of mood disorders, from the first steps, for example, the transition from paper and pencil to more sophisticated methods, to the development of ecological momentary assessment methods and, more recently, wearable systems. These recent developments have paved the way for the use of integrative approaches capable of assessing multiple variables. The PSYCHE project stands for Personalised monitoring SYstems for Care in mental HEalth.
Collapse
|
36
|
Characterization of CYP1A2, CYP2C19, CYP3A4 and CYP3A5 polymorphisms in South Brazilians. Mol Biol Rep 2014; 41:1453-60. [DOI: 10.1007/s11033-013-2990-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2012] [Accepted: 12/24/2013] [Indexed: 12/11/2022]
|
37
|
Preissner SC, Hoffmann MF, Preissner R, Dunkel M, Gewiess A, Preissner S. Polymorphic cytochrome P450 enzymes (CYPs) and their role in personalized therapy. PLoS One 2013; 8:e82562. [PMID: 24340040 PMCID: PMC3858335 DOI: 10.1371/journal.pone.0082562] [Citation(s) in RCA: 148] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Accepted: 10/24/2013] [Indexed: 11/19/2022] Open
Abstract
The cytochrome P450 (CYP) enzymes are major players in drug metabolism. More than 2,000 mutations have been described, and certain single nucleotide polymorphisms (SNPs) have been shown to have a large impact on CYP activity. Therefore, CYPs play an important role in inter-individual drug response and their genetic variability should be factored into personalized medicine. To identify the most relevant polymorphisms in human CYPs, a text mining approach was used. We investigated their frequencies in different ethnic groups, the number of drugs that are metabolized by each CYP, the impact of CYP SNPs, as well as CYP expression patterns in different tissues. The most important polymorphic CYPs were found to be 1A2, 2D6, 2C9 and 2C19. Thirty-four common allele variants in Caucasians led to altered enzyme activity. To compare the relevant Caucasian SNPs with those of other ethnicities a search in 1,000 individual genomes was undertaken. We found 199 non-synonymous SNPs with frequencies over one percent in the 1,000 genomes, many of them not described so far. With knowledge of frequent mutations and their impact on CYP activities, it may be possible to predict patient response to certain drugs, as well as adverse side effects. With improved availability of genotyping, our data may provide a resource for an understanding of the effects of specific SNPs in CYPs, enabling the selection of a more personalized treatment regimen.
Collapse
Affiliation(s)
- Sarah C Preissner
- Charité Universitätsmedizin Berlin, ECRC - Structural Bioinformatics Group, Deutsches Konsortium für Translationale Krebsforschung (DKTK), Berlin, Germany
| | | | | | | | | | | |
Collapse
|
38
|
Pharmacogenomics in psychiatry: from therapeutic drug monitoring to genomic medicine. Clin Pharmacol Ther 2013; 95:254-7. [PMID: 24196844 DOI: 10.1038/clpt.2013.221] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2013] [Accepted: 10/30/2013] [Indexed: 11/08/2022]
|
39
|
Spencer B, Prainsack B, Rujescu D, Giegling I, Collier D, Gaughran F, MacCabe JH, Barr CL, Sigurdsson E, Stovring H, Malhotra A, Curran SR. Opening Pandora’s box in the UK: a hypothetical pharmacogenetic test for clozapine. Pharmacogenomics 2013; 14:1907-14. [DOI: 10.2217/pgs.13.182] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Clozapine is a uniquely efficacious antipsychotic drug in treatment-resistant schizophrenia. Its use is restricted due to adverse effects including a rare but dangerous reduction in neutrophils (agranulocytosis) and the mandatory hematological monitoring this entails in many countries. We review the statistical, ethical and legal issues arising from a hypothetical pharmacogenetic test for clozapine, using the UK as an exemplary case for consideration. Our key findings include: a consideration of the probabilistic results that a pharmacogenetic test may return; the impact on drug licensing; and the potential for pharmacogenetic tests for clozapine being used without consent under the UK’s legal framework. We make recommendations regarding regulatory changes applicable to the special case of pharmacogenetic testing in clozapine treatment.
Collapse
Affiliation(s)
| | - Barbara Prainsack
- Department of Social Science, Health & Medicine, King’s College London, London, UK
| | - Dan Rujescu
- Department of Psychiatry, University of Halle, Germany
| | - Ina Giegling
- Department of Psychiatry, University of Halle, Germany
| | - David A Collier
- Institute of Psychiatry, King’s College London, London, UK
- Eli Lilly & Company Ltd, Erl Wood, UK
| | - Fiona Gaughran
- South London & Maudsley NHS Foundation Trust, London, UK
- Institute of Psychiatry, King’s College London, London, UK
| | - James H MacCabe
- South London & Maudsley NHS Foundation Trust, London, UK
- Institute of Psychiatry, King’s College London, London, UK
| | - Cathy L Barr
- The Toronto Western Research Institute, Toronto, ON, Canada
- The Hospital for Sick Children, Toronto, ON, Canada
| | - Engilbert Sigurdsson
- University of Iceland, Reykjavik, Iceland
- Department of Psychiatry, Landspitali-University Hospital, Reykjavik, Iceland
| | | | - Anil K Malhotra
- The Zucker Hillside Hospital, Glen Oaks, NY, USA
- Hofstra North Shore-LIJ School of Medicine, Hemptead, NY, USA
| | - Sarah R Curran
- South London & Maudsley NHS Foundation Trust, London, UK
- Institute of Psychiatry, King’s College London, London, UK
| |
Collapse
|
40
|
Hefner G, Laib AK, Sigurdsson H, Hohner M, Hiemke C. The value of drug and metabolite concentration in blood as a biomarker of psychopharmacological therapy. Int Rev Psychiatry 2013; 25:494-508. [PMID: 24151798 DOI: 10.3109/09540261.2013.836475] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Desirable and undesirable effects of a drug are related to its concentration at various sites of actions. For many psychotropic drugs, it has been shown that drug concentration in brain correlates with concentration in blood. The latter is also an available estimate of clearance and bioavailability. Its monitoring enables identification of multiple factors that have an impact on clinical outcomes, especially uncertain compliance and pharmacokinetic peculiarities. For this review we analysed for antidepressants if drug concentration in blood can be used as biomarker for psychopharmacological treatment. Systematic review of the literature revealed for new and old antidepressant drugs that drug and metabolite concentrations in blood are measures of the pharmacokinetic phenotype and related differentially to occupancy of primary target structures, therapeutic effects and unwanted anticholinergic, cardiac and other side effects. Drug concentration in blood can therefore be used as biomarker in clinical practice to guide psychopharmacological treatment with established antidepressant drugs. Monitoring of drug concentration is suitable to improve efficacy and safety of the pharmacotherapy, especially in elderly patients who require complex pharmacological therapies.
Collapse
Affiliation(s)
- Gudrun Hefner
- Department of Psychiatry and Psychotherapy, University Medical Centre Mainz , Germany
| | | | | | | | | |
Collapse
|
41
|
Clobazam therapeutic drug monitoring: a comprehensive review of the literature with proposals to improve future studies. Ther Drug Monit 2013; 35:30-47. [PMID: 23318278 DOI: 10.1097/ftd.0b013e31827ada88] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
BACKGROUND Clobazam was recently approved for Lennox-Gastaut syndrome in the United States. There is no published review article focused on clobazam therapeutic drug monitoring (TDM) in English. METHODS More than 200 clobazam articles identified by a PubMed search were carefully reviewed for information on clobazam pharmacokinetics. Clobazam is mainly metabolized by a cytochrome P450 (CYP) isoenzyme, CYP3A4, to its active metabolite, N-desmethylclobazam. Then, N-desmethylclobazam is mainly metabolized by CYP2C19 unless the individual has no CYP2C19 activity [poor metabolizer (PM)]. RESULTS Using a mechanistic approach to reinterpret the published findings of steady-state TDM and single-dosing pharmacokinetic studies, 4 different serum clobazam concentration ratios were studied. The available limited steady-state TDM data suggest that the serum N-desmethylclobazam/clobazam ratio can be useful for clinicians, including identifying CYP2C19 PMs (ratio >25 in the absence of inhibitors). There are 3 possible concentration/dose (C/D) ratios. The clobazam C/D ratio has the potential to measure the contribution of CYP3A4 activity to the clearance of clobazam from the body. The N-desmethylclobazam C/D ratio does not seem to be a good measure of clobazam clearance and should be substituted with the total (clobazam + N-desmethylclobazam) C/D ratio. CONCLUSIONS Future clobazam TDM studies need to use trough concentrations after steady state has been reached (>3 weeks in normal individuals and several months in CYP2C19 PMs). These future studies need to explore the potential of clobazam and total C/D ratios. Better studies on the relative potency of N-desmethylclobazam compared with the parent compound are needed to provide weighted total serum concentrations that correct for the possible lower N-desmethylclobazam pharmacodynamic activity. Standardization and more studies of C/D ratios from clobazam and other drugs can be helpful to move TDM forward.
Collapse
|
42
|
de Leon J. Is psychiatry scientific? A letter to a 21st century psychiatry resident. Psychiatry Investig 2013; 10:205-17. [PMID: 24302942 PMCID: PMC3843011 DOI: 10.4306/pi.2013.10.3.205] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Revised: 06/14/2013] [Accepted: 06/14/2013] [Indexed: 11/30/2022] Open
Abstract
During the development of the DSM-5, even the lay press questioned psychiatr's scientific validity. This review provides 21st century psychiatry residents with ways of answering these attacks by defining the concepts and history of psychiatry (a branch of medicine), medicine and science. Psychiatric language has two levels: first, describing symptoms and signs (19th century descriptive psychopathology developed in France and Germany), and second, describing disorders (psychiatric nosology was developed in the early 20th century by Kraepelin and resuscitated by the US neo-Kraepelinian revolution leading to the DSM-III). Science is a complex trial-and-error historical process that can be threatened by those who believe too much in it and disregard its limitations. The most important psychiatric advances, electroconvulsive therapy and major psychopharmacological agents, were discovered by "chance", not by scientific planning. Jaspers's General Psychopathology is a complex 100-year-old book that describes: 1) psychiatric disorders as heterogeneous and 2) psychiatry as a hybrid scientific discipline requiring a combination of understanding (a social science method) and explanation (a natural science method). In the 21st century Berrios reminds us of psychiatry's unfortunate methodological issues due to hybrid symptoms and disorders, some of which are better understood as problems in communication between interacting human beings; in those situations neuroscience methods such as brain imaging make no sense. A new language is needed in psychiatry. East Asian psychiatry residents, who are not particularly attached to the antiquated language currently used, may be particularly equipped for the task of recreating psychiatric language using 21st century knowledge.
Collapse
Affiliation(s)
- Jose de Leon
- University of Kentucky Mental Health Research Center at Eastern State Hospital, Lexington, KY, USA
- Psychiatry and Neurosciences Research Group (CTS-549), Institute of Neurosciences, University of Granada, Granada, Spain
| |
Collapse
|
43
|
Bragazzi NL. Rethinking psychiatry with OMICS science in the age of personalized P5 medicine: ready for psychiatome? Philos Ethics Humanit Med 2013; 8:4. [PMID: 23849623 PMCID: PMC4120773 DOI: 10.1186/1747-5341-8-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2012] [Accepted: 06/20/2013] [Indexed: 06/02/2023] Open
Abstract
The Diagnostic and Statistical Manual of Mental Disorders (DSM) is universally acknowledged as the prominent reference textbook for the diagnosis and assessment of psychiatric diseases. However, since the publication of its first version in 1952, controversies have been raised concerning its reliability and validity and the need for other novel clinical tools has emerged. Currently the DSM is in its fourth edition and a new fifth edition is expected for release in 2013, in an intense intellectual debate and in a call for new proposals. Since 1952, psychiatry has undergone many changes and is emerging as unique field in the medical area in which a novel approach is being demanded for properly treating patients: not the classical “one-size-fits-all” approach, but a more targeted and tailored diagnosis and therapeutics, taking into account the complex interactions among genes and their products, environment, culture and the psychological apparatus of the subject. OMICS sciences, being based on high-throughput technologies, are systems biology related fields (like genomics, proteomics, transcriptomics and so on). In the frame of the P5 medicine (personalized, participatory, predictive, preventive, psycho-cognitive), they could establish links between psychiatric diseases, which are disorders with a final common symptomatology with vastly heterogeneous biological, environmental and sociological underpinnings, and by understanding the psychiatric diseases beyond their classic symptomatic or syndromal definitions using OMICS research, one can have a broader picture and unprecedented links and reclassification of psychiatric nosology. Importantly, by understanding the basis of heterogeneity in diseases through OMICS research, one could also personalize treatment of psychiatric illnesses. In this manuscript, we discuss a gap in the current psychiatric research, namely the missing logical link among OMICS, personalized medicine and reclassification of diseases. Moreover, we explore the importance of incorporating OMICS-based quantitative dimensional criteria, besides the classical qualitative and categorical approach.
Collapse
|
44
|
Abstract
Psychiatric patients tend to exhibit significant interindividual variability in their responses to psychoactive drugs, as well as an irregular clinical course. For these (and other) reasons, increasing numbers of psychiatrists are turning to genotyping for help in selecting the psychopharmacologic agents best suited to an individual patient's distinctive metabolic characteristics and clinical presentation. Fortunately, routine genotyping is already available for gene variations that code for proteins involved in neurotransmission, and for drug-metabolizing enzymes involved in the elimination of many medications. Thus, genotyping-based personalized psychiatry is now in sight. Increasing numbers of clinically useful DNA microarrays are in the development stage, including a simplified procedure for genotyping patients for CYP2D6, which metabolizes a high proportion of the currently prescribed antidepressants and antipsychotics. It has been pointed out that psychiatric disease is rarely a consequence of an abnormality in a single gene, but reflects the perturbations of complex intracellular networks in the brain. Thus, analysis of functional neuronal networks is becoming an essential component of drug development strategies. The integrated use of technologies such as electroencephalography, magnetoencephalography, functional magnetic resonance imaging (fMRI), and diffusion tensor imaging (DTI), in combination with pharmacogenetics, promises to transform our understanding of the mechanisms of psychiatric disorders and their treatment. The concept of network medicine envisions a time to come when drugs will be used to target a neural network rather than simply components within the network. Personalized medicine in psychiatry is still at an early stage, but it has a very promising future.
Collapse
Affiliation(s)
- Jorge A Costa e Silva
- Brazilian Brain Institute, Rua Getúlio das Neves, 22, 22461-210 Rio de Janeiro, RJ - Brazil.
| |
Collapse
|
45
|
Why has it taken so long for biological psychiatry to develop clinical tests and what to do about it? Mol Psychiatry 2012; 17:1174-9. [PMID: 22869033 DOI: 10.1038/mp.2012.105] [Citation(s) in RCA: 640] [Impact Index Per Article: 53.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Patients with mental disorders show many biological abnormalities which distinguish them from normal volunteers; however, few of these have led to tests with clinical utility. Several reasons contribute to this delay: lack of a biological 'gold standard' definition of psychiatric illnesses; a profusion of statistically significant, but minimally differentiating, biological findings; 'approximate replications' of these findings in a way that neither confirms nor refutes them; and a focus on comparing prototypical patients to healthy controls which generates differentiations with limited clinical applicability. Overcoming these hurdles will require a new approach. Rather than seek biomedical tests that can 'diagnose' DSM-defined disorders, the field should focus on identifying biologically homogenous subtypes that cut across phenotypic diagnosis--thereby sidestepping the issue of a gold standard. To ensure clinical relevance and applicability, the field needs to focus on clinically meaningful differences between relevant clinical populations, rather than hypothesis-rejection versus normal controls. Validating these new biomarker-defined subtypes will require longitudinal studies with standardized measures which can be shared and compared across studies--thereby overcoming the problem of significance chasing and approximate replications. Such biological tests, and the subtypes they define, will provide a natural basis for a 'stratified psychiatry' that will improve clinical outcomes across conventional diagnostic boundaries.
Collapse
|
46
|
Abstract
The use of pharmacogenetics information is central to the concept of personalized medicine. Understanding pharmacogenetic differences in drug response and tolerability has been investigated mainly through the study of pharmacokinetic and pharmacodynamic processes. The hope and promise of pharmacogenetic testing has led to the commercial availability of several testing products. With the exception of the relationship between certain types of adverse drug reactions and immune response genes such as the human leukocyte antigen, a growing body of research has not yet established the clinical utility of pharmacogenetics testing. Variance in findings from pharmacogenetics studies conducted to date may be due to epistasis (gene-gene and gene-environment interactions), epigenetics (non-DNA sequence-related heredity), or other genetic factors, which have been largely unexplored in pharmacogenetics research.
Collapse
Affiliation(s)
- Robert H Howland
- University of Pittsburgh School of Medicine, Western Psychiatric School of Medicine, Western Psychiatric Institute and Clinic, Pittsburgh, Pennsylvania 15213, USA.
| |
Collapse
|
47
|
Abstract
Pharmacogenetic analyses of treatments for alcohol dependence attempt to predict treatment response and side-effect risk for specific medications. We review the literature on pharmacogenetics relevant to alcohol dependence treatment, and describe state-of-the-art methods of pharmacogenetic research in this area. Two main pharmacogenetic study designs predominate: challenge studies and treatment-trial analyses. Medications studied include US FDA-approved naltrexone and acamprosate, both indicated for treating alcohol dependence, as well as several investigational (and off-label) treatments such as sertraline, olanzapine and ondansetron. The best-studied functional genetic variant relevant to alcoholism treatment is rs1799971, a single-nucleotide polymorphism in exon 1 of the OPRM1 gene that encodes the μ-opioid receptor. Evidence from clinical trials suggests that the presence of the variant G allele of rs1799971 may predict better treatment response to opioid receptor antagonists such as naltrexone. Evidence from clinical trials also suggests that several medications interact pharmacogenetically with variation in genes that encode proteins involved in dopaminergic and serotonergic neurotransmission. Variation in the DRD4 gene, which encodes the dopamine D(4) receptor, may predict better response to naltrexone and olanzapine. A polymorphism in the serotonin transporter gene SLC6A4 promoter region appears related to differential treatment response to sertraline depending on the subject's age of onset of alcoholism. Genetic variation in SLC6A4 may also be associated with better treatment response to ondansetron. Initial pharmacogenetic efforts in alcohol research have identified functional variants with potential clinical utility, but more research is needed to further elucidate the mechanism of these pharmacogenetic interactions and their moderators in order to translate them into clinical practice.
Collapse
Affiliation(s)
- Albert J. Arias
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA,VA Connecticut Healthcare System, West Haven, CT, USA
| | - R. Andrew Sewell
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA,VA Connecticut Healthcare System, West Haven, CT, USA
| |
Collapse
|
48
|
|
49
|
Abstract
Schizophrenia (SCZ) is among the most disabling of mental disorders. Several neurobiological hypotheses have been postulated as responsible for SCZ pathogenesis: polygenic/multifactorial genomic defects, intrauterine and perinatal environment-genome interactions, neurodevelopmental defects, dopaminergic, cholinergic, serotonergic, gamma-aminobutiric acid (GABAergic), neuropeptidergic and glutamatergic/N-Methyl-D-Aspartate (NMDA) dysfunctions, seasonal infection, neuroimmune dysfunction, and epigenetic dysregulation. SCZ has a heritability estimated at 60-90%. Genetic studies in SCZ have revealed the presence of chromosome anomalies, copy number variants, multiple single-nucleotide polymorphisms of susceptibility distributed across the human genome, aberrant single nucleotide polymorphisms (SNPs) in microRNA genes, mitochondrial DNA mutations, and epigenetic phenomena. Pharmacogenetic studies of psychotropic drug response have focused on determining the relationship between variation in specific candidate genes and the positive and adverse effects of drug treatment. Approximately, 18% of neuroleptics are major substrates of CYP1A2 enzymes, 40% of CYP2D6, and 23% of CYP3A4; 24% of antidepressants are major substrates of CYP1A2 enzymes, 5% of CYP2B6, 38% of CYP2C19, 85% of CYP2D6, and 38% of CYP3A4; 7% of benzodiazepines are major substrates of CYP2C19 enzymes, 20% of CYP2D6, and 95% of CYP3A4. About 10-20% of Western populations are defective in genes of the CYP superfamily. Only 26% of Southern Europeans are pure extensive metabolizers for the trigenic cluster integrated by the CYP2D6+CYP2C19+CYP2C9 genes. The pharmacogenomic response of SCZ patients to conventional psychotropic drugs also depends on genetic variants associated with SCZ-related genes. Consequently, the incorporation of pharmacogenomic procedures both to drugs in development and drugs on the market would help to optimize therapeutics in SCZ and other central nervous system (CNS) disorders.
Collapse
Affiliation(s)
- Ramón Cacabelos
- EuroEspes Biomedical Research Center, 15165-Bergondo, Coruña, Spain.
| | | |
Collapse
|
50
|
Spaulding W, Deogun J. A pathway to personalization of integrated treatment: informatics and decision science in psychiatric rehabilitation. Schizophr Bull 2011; 37 Suppl 2:S129-37. [PMID: 21860042 PMCID: PMC3160127 DOI: 10.1093/schbul/sbr080] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Personalization of treatment is a current strategic goal for improving health care. Integrated treatment approaches such as psychiatric rehabilitation benefit from personalization because they involve matching diverse arrays of treatment options to individually unique profiles of need. The need for personalization is evident in the heterogeneity of people with severe mental illness and in the findings of experimental psychopathology. One pathway to personalization lies in analysis of the judgments and decision making of human experts and other participants as they respond to complex circumstances in pursuit of treatment and rehabilitation goals. Such analysis is aided by computer simulation of human decision making, which in turn informs development of computerized clinical decision support systems. This inspires a research program involving concurrent development of databases, domain ontology, and problem-solving algorithms, toward the goal of personalizing psychiatric rehabilitation through human collaboration with intelligent cyber systems. The immediate hurdle is to demonstrate that clinical decisions beyond diagnosis really do affect outcome. This can be done by supporting the hypothesis that a human treatment team with access to a reasonably comprehensive clinical database that tracks patient status and treatment response over time achieves better outcome than a treatment team without such access, in a controlled experimental trial. Provided the hypothesis can be supported, the near future will see prototype systems that can construct an integrated assessment, formulation, and rehabilitation plan from clinical assessment data and contextual information. This will lead to advanced systems that collaborate with human decision makers to personalize psychiatric rehabilitation and optimize outcome.
Collapse
|