Back to Journals » Journal of Experimental Pharmacology » Volume 8

Experimental treatment of antipsychotic-induced movement disorders

Authors Shireen E

Received 29 October 2015

Accepted for publication 23 December 2015

Published 8 August 2016 Volume 2016:8 Pages 1—10

DOI https://doi.org/10.2147/JEP.S63553

Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 3

Editor who approved publication: Professor Bal Lokeshwar


Erum Shireen

Department of Biochemistry, Neurochemistry and Biochemical Neuropharmacology Research Laboratory, University of Karachi, Karachi, Pakistan

Abstract: Antipsychotic drugs are extensively prescribed for the treatment of schizophrenia and other related psychiatric disorders. These drugs produced their action by blocking dopamine (DA) receptors, and these receptors are widely present throughout the brain. Therefore, extended antipsychotic use also leads to severe extrapyramidal side effects. The short-term effects include parkinsonism and the later appearing tardive dyskinesia. Currently available treatments for these disorders are mostly symptomatic and insufficient, and are often linked with a number of detrimental side effects. Antipsychotic-drug-induced tardive dyskinesia prompted researchers to explore novel drugs with fewer undesirable extrapyramidal side effects. Preclinical studies suggest a role of 5-hydroxytryptamine (serotonin)-1A and 2A/2C receptors in the modulation of dopaminergic neurotransmission and motivating a search for better therapeutic strategies for schizophrenia and related disorders. In addition, adjunctive treatment with antioxidants such as vitamin E, red rice bran oil, and curcumin in the early phases of illness may prevent additional oxidative injury, and thus improve and prevent further possible worsening of related neurological and behavioral deficits in schizophrenia. This review explains the role of serotonergic receptors and oxidative stress, with the aim of providing principles for prospect development of compounds to improve therapeutic effects of antischizophrenic drugs.

Keywords: antipsychotic drugs, tardive dyskinesia, parkinsonian-like symptoms, movement disorders

Introduction

Antipsychotic drugs

Antipsychotics were initially known as “neuroleptics” (from Latin, to take a grip of the neuron), since extrapyramidal side effects (EPSE) were considered fundamental for their curative properties.1 The antipsychotic is a group of drugs used to treat mental health conditions such as schizophrenia, agitation, severe anxiety, mania, and violent impulsive behavior in both adults and adolescents. These drugs produced their effects particularly by blocking dopamine (DA) receptors in the brain. Antipsychotic drugs can not only be categorized by their chemical structure but also be classified according to their pharmacology and clinical properties.

Types of antipsychotic drugs

Typical antipsychotic drugs

These are the most primitive neuroleptic drugs, dating from the early 1950s. The typical antipsychotic properties are accomplished through its antagonism at dopaminergic receptors. Haloperidol, the most commonly used conventional antipsychotic, is primarily effective in treating the positive signs of schizophrenia. The typical antipsychotic medications (eg, haloperidol or thioridazine), with or without psychosocial and environmental interventions, are frequently used to treat symptoms that occur in a majority of older patients with dementia during their illness courses and have been the mainstay of psychopharmacologic treatment during the past several decades.2

Atypical antipsychotic drugs

The “second generation” of neuroleptics was developed between the early 1960s and the 1980s. Initially, clozapine appeared as an innovatory drug with improved effectiveness over existing agents.3 The atypical neuroleptics are different from the older drugs concerning their mechanism of action. They exhibit less EPSE due to their combined effects on both dopaminergic and serotonergic receptors. Formerly, they were called atypical, because their propensity to cause dyskinetic symptoms in some patients was absent. It is now known that atypical neuroleptics also cause symptoms of tardive dyskinesia (TD), but such symptoms may take longer to manifest.

Third-generation antipsychotic drugs

These medications are the most recent to be developed and still carry the risk of causing dyskinesia. Since these are the newest medications available (developed since 2001), they are also the most costly. Aripiprazole is a fairly new antipsychotic drug that is used for the treatment of bipolar disorder and clinical depression but it is still not free from side effects.4

Typical versus atypical antipsychotic drugs

First-generation antipsychotics (FGAs) are classified according to their chemical structure, while second-generation antipsychotics (SGAs) are categorized according to their pharmacologic properties. The FGAs were effective, but the EPSE were often excruciating, which improved the usage of SGAs, which seem to have less risk for these effects. Due to this reason, conventional antipsychotics are usually substituted by the atypical antipsychotics.5 Some clinical studies have been conducted to find out the efficacy and safety of these drugs on neuropsychiatric symptoms, but contradictory results were obtained.6 Some meta-analyses and systematic reviews have provided only limited support for the superiority of SGAs.79 There was no substantial evidence that second-generation drugs were more effective and better tolerated for the treatment of negative symptoms or cognitive deficits.10 In this perspective, it has been suggested that typical antipsychotics are still as useful as atypicals in the treatment of schizophrenia.11 It has been found that none of the more recently developed antipsychotics except olanzapine have been shown to be superior to FGAs or even to achieve the level of clinical efficacy as attained with clozapine.12,13 The results are also equivocal regarding the incidence of EPSE in which, except for clozapine, no clear improvement was observed in EPSE profiles with newer antipsychotics.14,15 This failure is perhaps not surprising given the lack of clarity/validity of the difference between typical versus atypical antipsychotics, or the distinction between FGAs, SGAs, and third-generation antipsychotics.

Antipsychotic-drug-induced side effects

Drug-induced side effects can sometimes be troublesome. There is often a trade-off between easing symptoms and having to put up with some side effects from treatment. Different antipsychotic medicines can have different types of side effects. Sometimes one medicine causes side effects in some people but not in others. At present, none of the antipsychotic is absolutely free from side effects; thus, the treatment with these agents involves balancing risks and benefits. We need to have better understanding of pharmacological principles that could enhance the efficacy and minimize the side effects of these agents. These medications induced side effects including TD and other related movement disorders.1621 Many of them have other serious side effects such as agranulocytosis, a type of autoimmune disease in which the number of infection-fighting white blood cells are decimated. Neuroleptic malignant syndrome is a rare but potentially fatal disease that is associated with all classes of antipsychotic medication.22 The risk of sudden cardiac death is increased >2.4 times with both typical and atypical antipsychotic drugs.23 Extrapyramidal effects include parkinsonism, dystonia, and oropharyngeal dysphagia leading to an increased risk of pneumonia.24 Other side effects of atypical neuroleptics may include diabetes, inflammation of the pancreas, and weight gain. It is also known to cause insomnia as well as drowsiness, constipation, and vision problems. However, meta-analyses of clinical trials in participants with chronic schizophrenia have suggested a limited advantage of the newer agents in terms of efficacy79 and two recent large trials failed to find a difference between these two classes of antipsychotics.25,26 The quest for the search of more effective antipsychotic drugs with a lower occurrence of EPSE, therefore, remains highly relevant and represents an unmet research requirement for the finding of novel treatment strategies for schizophrenia and other disorders in which psychosis represents an important aspect, such as Huntington’s disease.27,28 In this review, we focused on the typical antipsychotic-induced movement disorders and possible therapeutic strategies for alleviating their undesirable side effects.

Antipsychotic-induced parkinsonism and its treatment

What is parkinsonism?

Major symptoms of parkinsonism include tremor, rigidity, akinesia, and postural instability. Currently, the term drug-induced parkinsonism is nearly identical with antipsychotic-induced parkinsonism. However, drug-induced parkinsonism is a recurrent undesirable effect of several drugs that impede dopaminergic function particularly in the basal ganglia,29,30 including calcium antagonists, orthopramides, and substituted benzamides.29,31,32 DA receptors are extensively dispersed in the brain, and typical antipsychotics bind with dopaminergic receptors mainly in the striatum. Consequently, patients using these drugs are mostly at high risk of exhibiting parkinsonism and other related EPSE. Typical neuroleptic drugs such as haloperidol are extensively prescribed for the treatment of schizophrenia; their therapeutic effects are also associated with movement disorder,33 for instance, parkinsonian-like effects and TD are frequently described as EPSE.17,19,34 On the other hand, the risk for the development of EPSE was considered to be low for atypical antipsychotics such as clozapine, risperidone, olanzapine, and aripiprazole. It was believed that their relatively low incidence to induce EPSE was due to their potential antagonist activity at 5-hydroxytryptamine (5-HT)-2A receptors than DA receptors.35 Although, treatment with neuroleptics could elicit EPSE, these drugs still prove to be efficient in treating and managing schizophrenia and related behavioral disorders.

Animal model of parkinsonism

Two standard behavioral preclinical tests are used to evaluate the following:

  1. When a D2 receptor antagonist such as haloperidol is administered to a rat, it will remain immobile for a given period of time when placed on an inclined surface. This immobility and/or frozen body posture is called catalepsy17,18,20,36,37 and caused by the blockade of DA receptors within the striatum and is considered to be a predictor of EPSE inducing potential in humans.36,38
  2. The second test, the impairment of motor coordination, is also used as a predictor of antipsychotic-induced EPSE. A day before the treatment, animals are trained in a single session until they attain 150 seconds on the Rotor-Rod. Anti-psychotic agents will impair its ability to attain 150 seconds on Rota-Rod. The latency to fall in a test session of 150 seconds will be taken as a measure of motor coordination.1921

Pathophysiology of parkinsonism

Antipsychotic drugs have potential DA D2 receptor blocking capability, and the beneficial therapeutic effects of these drugs on psychosis are linked with their action on the reduction in dopaminergic transmission particularly in the limbic system. Antipsychotic-drug-induced striatal DA D2 receptor blockade produces initial disinhibition of gamma amino butyric acid (GABA)- and encephalin-containing striatal neurons after the disinhibition of the subthalamic nucleus. This leads to augmented thalamocortical GABAergic inhibition by enhancing the inhibitory projection from the globus pallidus/substantia nigra pars reticulata. This pathway is similar to the model of interruption of the basal ganglia motor loop in Parkinson’s disease. Likewise, >80% of D2 receptors were reported to be occupied in patients with EPSE who were using neuroleptics.39 Therefore, clinical symptoms of Parkinson disease started to appear when >80% of nigral dopaminergic neurons had degenerated. In this respect, neuroleptic-induced motor disorders are known as parkinsonian-like symptoms.40

Role of serotonin in parkinsonism

The role of serotonergic system has been identified in the toning of dopaminergic neuronal activity. 5-HT (serotonin)-1A agonists and partial agonists are identified to elicit the anticataleptogenic effects,17,19,4143 which is positively correlated with the rank order of their intrinsic activity at 5-HT-1A receptors.44 In order to find out the prospective role of somatodendritic and/or postsynaptic 5-HT-1A receptors in the modulation of haloperidol-induced catalepsy, we4 found a diminished availability of 5-HT in the striatum by the administration of partial agonist buspirone and selective 5-HT-1A agonist 8-hydroxy-2-(di-n-propylamino) tetralin (8-OH-DPAT) in rats owing to the stimulation of somatodendritic 5-HT-1A receptors. Therefore, dopaminergic neurotransmission was released from the inhibitory effect of 5-HT to attenuate haloperidol-induced catalepsy (Figure 1). On the other hand, postsynaptic 5-HT-1A receptors were occupied by 8-OH-DPAT and exerted an extra stimulatory influence on dopaminergic neuronal activity45 leading to the additional anticataleptogenic effects of 8-OH-DPAT compared with buspirone.17 By and large, these studies provide evidence that the stimulation of presynaptic in addition to postsynaptic 5-HT-1A receptors augments DA neurotransmission particularly in the striatum. 5-HT-2C receptors are known to exert serotonergic inhibitory influence on the activity of dopaminergic neurons. These receptors are located on the cell body and terminal region of dopaminergic neurons.46,47

Figure 1 Cataleptic effects of haloperidol (1 mg/kg) in saline, 8-OH-DPAT (0.25 mg/kg), or buspirone (1 mg/kg) pre-injected rats.
Notes: Values are mean ± SD (n=6), 30 minutes after the administration of haloperidol. Significant differences by Newman–Keuls test: *P<0.01 in 8-OH-DPAT or buspirone-injected animals as compared with respective saline-injected (first injection) controls. +P<0.01 in haloperidol-injected animals as compared with respective saline, 8-OH-DPAT or buspirone-injected animals following the two-way ANOVA.
Abbreviations: ANOVA, analysis of variance; 8-OH-DPAT, 8-hydroxy-2-(di-n-propylamino) tetralin; SD, standard deviation.

Therefore, the administration of mianserin and mesulergine, 5-HT-2A/2C receptor antagonists (Figures 2 and 3), possibly releases DA neurons from the inhibitory effects of 5-HT to ameliorate parkinsonian-like effects of the neuroleptics drug.20,48 This effect is illustrated in Figure 4.

Figure 2 Effects of mianserin (2.5 and 5.0 mg/kg) on haloperidol-induced deficits of exploratory activity (in an open field [A]) and motor coordination (B) on Rota-Rod in rats.
Notes: Values are mean ± SD (n=6), 30 minutes after the administration of haloperidol. Significant differences by Newman–Keuls test. *P<0.01 from respective saline-injected controls, +P<0.01 from saline- plus haloperidol-injected animals, #P<0.01 from mianserin- plus haloperidol-injected animals.
Abbreviation: SD, standard deviation.

Figure 3 Effects of mesulergine (1.0 and 3.0 mg/kg) on haloperidol-induced deficits of exploratory activity (in an open field [A]) and motor coordination (B) on Rota-Rod in rats.
Notes: Values are mean ± SD (n=6), 30 minutes after the administration of haloperidol. Significant differences by Newman–Keuls test. *P<0.01 from respective saline-injected controls, +P<0.01 from saline- plus haloperidol-injected animals, #P<0.01 from mesulergine- plus haloperidol-injected animals.
Abbreviation: SD, standard deviation.

Figure 4 Role of 5-HT receptors in the modulation of haloperidol-induced EPSE.
Abbreviations: DA, dopamine; EPSE, extrapyramidal side effects; 5-HT, 5-hydroxytryptamine; 8-OH-DPAT, 8-hydroxy-2-(di-n-propylamino) tetralin.

In addition to drugs, certain physiological conditions may also have beneficial implications to treat or alleviate antipsychotic-induced side effects. We have found21 that repeated exposure to immobilization stress elicited a reversal of haloperidol-induced motor deficits in rats. It was proposed that somatodendritic 5-HT-1A and 5-HT-2C receptor desensitization following the exposure to uncontrolled stress contributes to the release of DA neurotransmission from the inhibitory effect of 5-HT. Conversely, an increase in the efficacy of postsynaptic 5-HT-1A receptors may also produced an excitatory influence on the activity of the dopaminergic neuron. Therefore, it was thought to be involved in the reversal of haloperidol-induced parkinsonian, like symptoms in rats exposed to repeated stress.21

Antipsychotic-induced TD and its treatment

What is TD?

The term “tardive dyskinesia” was coined in 1964 by Faurbye et al,49 and it is a syndrome of potentially irreversible, involuntary hyperkinetic movements particularly in the orofacial region, which develops in patients during chronic neuroleptic treatment, and also it is a major limitation of neuroleptic therapy.19,34,49,50 Classical TD involves oral–buccal–lingual masticatory movements, which is characterized by repetitive jaw, face, and lingual movements (commonly protrusion) and may involve puffing of the cheeks, lip-smacking, puckering, and pursing, choreoathetoid movements in the limbs and trunk, guitar or piano playing movements, and other flexion and extension movements of the fingers and/or wrists.51 TD develops in ~35% of patients administered long-term with typical antipsychotics52 and may be irreversible in approximately half of the patients.53

Epidemiological studies show that some factors such as age, institutionalization, a psychiatric diagnosis of mood disorders, and a history of acute extrapyramidal syndromes increase the risk of developing TD. It is more common in female patients.54

Animal model of TD

Animal models for TD have been developed to explore new treatment strategies for this disabling disease.19,21,41 Studies in animal models show that rats treated with chronic administration of antipsychotics exhibit vacuous chewing movements (VCMs) that show many classical characteristics of TD, including similarities in emergence, developmental time course, and response to dopaminergic drugs.55 VCMs are generally described by purposeless mouth openings in the vertical plane, with or without tongue protrusion.55,56 Antipsychotic-induced VCMs seem to be in the same low frequency range (1–3 Hz) as TD symptoms in humans.56 Although rats are considered one of the best animal models, there are certain drawbacks of this model. Haloperidol-induced VCMs have been reported to normalize after drug withdrawal in some studies,57,58 but they may be irreversible in humans.59

Pathophysiology of TD

The pathophysiology of this disabling and frequently irreversible movement disorder is still vague. The long-term treatment with neuroleptics can induce some neuropathological changes in the central nervous system.60 However, most studies have focused on the biochemical or behavioral changes correlated with long-term antipsychotic treatment. Several factors such as DA D2 receptor supersensitivity, GABAergic hypofunction, excitotoxicity, and oxidative stress (OS) have all been involved in the pathophysiology of TD.61,62 It has been hypothesized that chronic administration of antipsychotic causes postsynaptic DA receptor responsiveness in some studies, others reported an augmented behavioral response to DA agonists following long-term drug treatment63 and persistent DA D2 receptor occupancy.64 In addition, it was also proposed that increase in the effectiveness of somatodendritic and postsynaptic 5-HT-1A receptors after chronic treatment with haloperidol65,66 might reduce the normal inhibitory serotonergic influence on locomotor activity to exhibit late-appearing dyskinesia as observed in patients on typical antipsychotic therapy.

It has been found that administration of typical antipsychotics such as haloperidol produces a shrinkage or loss of tyrosine hydroxylase immunoreactive neurons particularly in the substantia nigra. On the other hand, a decrease in the tyrosine hydroxylase immunoreactivity was also observed in rat striatum. Both of these changes may be involved in the elicitation of VCMs.67,68

These alterations particularly take place in the nigrostriatal pathway but not in the mesolimbic DA system.69 It is therefore suggested that antipsychotic-induced brain morphological changes are the consequence of an enhanced DA metabolism that could raise intracellular DA concentration, followed by the inhibition of complex I, and increased OS.70 The pathophysiology is illustrated in Figure 5.

Figure 5 Proposed pathophysiological mechanisms of antipsychotic-induced TD.
Abbreviations: DA, dopamine; GABA, gamma amino butyric acid; TD, tardive dyskinesia; GSH, glutathione; SOD, superoxide dismutase.

Role of serotonin in TD

5-HT-1A receptors are involved not only in the etiology of schizophrenia but also in the pathophysiology of TD. It has been found that postsynaptic 5-HT-1A receptors were upregulated in the postmortem brain samples of schizophrenic patients.71,72 Preclinical studies have also showed the role of 5-HT-1A receptors in the alleviation of TD. Thus, coadministration of buspirone, a 5-HT-1A receptor partial agonist,72,73 reversed reserpine-induced dyskinetic movements in a rat model of TD.74 8-OH-DPAT, a selective 5-HT-1A agonist, inhibited haloperidol-induced VCMs in a dose-dependent manner.75 It has been reported from our laboratory that coadministration of buspirone at low doses reversed the induction of VCMs and 5-HT-1A receptor supersensitivity followed by the chronic administration of haloperidol. Therefore, a supersensitive somatodendritic serotonergic influence on the activity of dopaminergic neurons is possibly a causative component in the onset of TD and considered a novel treatment strategy for curing schizophrenia.19

OS and TD

There is a growing body of evidence that OS is involved in the pathology of major neuropsychiatric disorders. Evidence from postmortem as well as peripheral tissues indicates alterations in both free radicals and antioxidant defense mechanisms in disorders such as schizophrenia and mood disorders.76 The long-term administration of typical neuroleptics, but not atypical, also decreases the levels of antioxidant enzyme, participating in the exacerbation of the oxidative events.77,78 In view of the OS generation, oxidative damage is detected when the production of reactive oxygen species surpasses the capability of the antioxidant system to remove them.79 Additionally, the brain is more prone to the oxidative damage as compared with other organs or systems,80 as it contains high concentration of membrane lipids, excitotoxic amino acids, low levels of antioxidant defenses, and autoxidizable neurotransmitters. The neuronal phospholipid membrane contains polyunsaturated fatty acids that are more vulnerable to lipid peroxidation by reactive oxygen species than other lipids such as cholesterol and saturated fatty acids.81 Preclinical studies showed an increased rate of lipid peroxidation and peroxidative neuronal damage induced by the treatment with haloperidol.82 It was found that OS contributed to the toxicity of haloperidol, which activated a sequence of cellular processes leading even to cell death; the production of free radicals was an integral part of this cascade.76 The SGAs are reported to produce low risk of TD. But they still develop TD predominantly in older adults, perhaps due to the mechanisms that improve psychoses to overlap with those that could produce TD.83,84 Thus, there is a crucial requirement for better psychotic disorder management alternatives for or at least to lessen the side effects that develop with their use. Recently, the American Academy of Neurology presented the much-needed evidence-based guideline on the management of TD.85

Treatment strategies for TD

Recent studies from our laboratory have shown a reversal of haloperidol-induced parkinsonian-like effects and TD in rats cotreated with red rice bran oil (RRBO)86 as shown in Figure 6. It is tempting to relate protective and preventive effects of free radical scavenger RRBO with the reversal of haloperidol-induced TD. It is therefore suggested that incorporation of dietary supplementation-like RRBO having antioxidant properties can be useful to develop nutraceuticals for the treatment of schizophrenia.

Figure 6 Time course effect of RRBO on haloperidol-induced deficits of vacuous chewing movements.
Notes: Values are mean ± SD (n=12). Significant differences by Newman–Keuls test. **P<0.01 from values of similarly treated animals, ++P<0.01 from respective week values of W-treated animals, and ##P<0.01 from respective week values of WS and haloperidol- plus saline-treated animals.
Abbreviations: RRBO, red rice bran oil; SD, standard deviation; VCMs, vacuous chewing movements; W, water; S, saline; H, haloperidol.

Similarly, in other studies, antioxidant activity of hydroalcoholic extract of Brassica oleracea87 is reported to be involved in the reversal of haloperidol-induced TD suggesting it as beneficial adjuvant in the treatment of drug-induced EPSE effects and related disorders. However, other preclinical studies have reported that administration of nicotine may be useful for improving the TD associated with antipsychotic uses.70 On the other hand, administration of curcumin reversed oxidative stress-induced TD in rats suggesting it as a promising therapeutic choice to treat this hyperkinetic movement disorder.88 Related study presented a detailed review on positive results of nonneuroleptic agents in different trials, including tetrabenazine, amantadine, levetiracetam, piracetam, clonazepam, propranolol, vitamin B6, and Ginkgo biloba.89 Clinical studies have shown that ginkgo biloba (240 mg/d for 12 weeks) was more helpful in reducing TD symptoms in people with schizophrenia.90 On the other hand, the administration of vitamin B691 and vitamin E92 (1,200 IU/d for 12 weeks) also proved to be effective in treating TD in clinical trials.

Conclusion

In conclusion, antioxidants are very low-risk drugs, and their use could be more beneficial as compared with the invented drugs, which, in most cases, produce undesirable side effects during their chronic treatment. Therefore, we suggest the use of antioxidants and serotonergic drugs as stand-alone intervention or as adjunct to conventional medications. They may provide attractive treatment strategic targets to manage antipsychotic-induced EPSE arising from dysfunctional serotonergic neurotransmission and OS. These studies suggest that antioxidants should be tried.

Disclosure

The author reports no conflicts of interest in this work.


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