Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0036341 (schizophrenia)
 60,220 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Catalytic properties of multiple forms (separated by affinity chromatography) of rats brain mitochondrial monoamine oxidase (MAO, MAO-I, MAO-11 alpha, MAO-11 beta, MAO-111) have been studied in the animals selected for propensity to development of catatonic syndrome considered as an experimental model of the catatonic syndrome occurring in schizophrenia. It was shown that in experimental catatonia (as compared with rats of the corresponding control group) there was a dramatic increase in the brain stem of the rate of oxidative deamination of beta-phenylethylamine catalyzed by MAO-III; there was also a statistically significant (albeit less expressed than in the experiments with beta-phenylethylamine) increase in the rate of deamination of tyramine and a decrease in the rate of deamination of serotonin. In the systems with MAO-II beta we detected statistically significant increase in the rates of deamination of tyramine and beta-phenylethylamine in experimental catatonia as compared with corresponding control. Studies of multiple forms of brain MAO provide more informative data than estimation of "total" MAO activity (without separation of the multiple forms of this enzyme).
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PMID:[Multiple forms of monoaminoxidase in the rat brain during experimental catatonia]. 225 87

As most diet therapy texts provide little information about psychiatric illnesses and their treatment, this article is intended as a brief introduction for dietitians. Several psychiatric illnesses, including schizophrenia, mood disorders, eating disorders, and substance abuse, may adversely affect food intake and nutritional status. The drugs used to treat those disorders similarly have effects on appetite and gastrointestinal function and interact with food and nutrients. Antipsychotics, antidepressants, and monoamine oxidase inhibitors (MAOIs) cause dry mouth, constipation, and weight gain. Lithium may cause nausea, vomiting, diarrhea, polydipsia, and weight gain. MAOIs have well-known interactions with foods containing tyramine. Lithium interacts with dietary sodium and caffeine; decreasing dietary intakes of those substances may produce lithium toxicity. Despite claims to the contrary, major psychiatric illnesses cannot be cured by nutritional therapies alone. Dietitians can, however, play an important role as part of a multidisciplinary team in the treatment of patients with psychiatric illness. Such a role includes nutrition assessment and monitoring, nutrition interventions, patient and staff education, and some forms of psychotherapy, including supportive and behavioral therapies for patients with eating disorders.
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PMID:Nutritional aspects of psychiatric disorders. 267 98

Two hundred eighty-five volunteers from a community college were screened on campus for accuracy of their smooth pursuit eye movements (SPEM) by electrooculograph (EOG). Those volunteers with the least and the most accurate SPEM were recalled to the laboratory for a comprehensive evaluation of clinical and demographic characteristics, family history, neurological status, and psychophysiological and biological measures, including SPEM [repeat EOG test and infrared (IR) test], an electroencephalogram, auditory and visual evoked potentials, reaction time (RT), the continuous performance task (CPT), platelet monoamine oxidase (MAO), plasma amine oxidase, and dopamine-beta-hydroxylase (DBH). Low-accuracy SPEM was associated with social isolation, inadequate rapport, eccentricity, and a variety of related schizotypal or schizophrenia-like characteristics, but not with generalized psychopathology or other demographic/medical/clinical history variables. Low-accuracy SPEM also was associated with neurological and psychophysiological abnormalities frequently observed in schizophrenic patients. These results suggest that impaired SPEM may reflect an underlying central nervous system dysfunction that is specifically associated with clinical and biological characteristics related to schizophrenia, even in the absence of overt schizophrenia.
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PMID:Clinical, psychophysiological, and neurological characteristics of volunteers with impaired smooth pursuit eye movements. 272 22

The present study, using a diathesis-stress model, attempted to confirm prior findings with platelet monoamine oxidase (MAO) activity and stress in a middle-aged, non-clinic population. One hundred and seventy-eight adult males from a statewide community club were tested for platelet MAO activity and stressful life events and were also given a variety of psychological measures of both psychopathology and psychosocial coping. The data were examined both for correlations across the total sample and for a comparison of high-risk groups (top and bottom 15% of MAO activity) with a middle MAO group. Low platelet MAO activity was related to a higher incidence of contact with mental health professionals, and more frequent use of alcohol and cigarette smoking. High MAO activity was related to higher levels of anxiety and somatization. High levels of stress were related to increased psychosocial problems reported for female and family members, higher scores on two schizophrenia-related MMPI scales (schizophrenia and paranoia subscales), but fewer idiosyncratic associations, elevated hypomanic, depression, and anxiety scores, increased alcohol use, and increased use of prescribed antianxiety and sedative medication. Neither MAO nor stress were related to current levels of psychosocial coping. Moreover, no interaction effects were uncovered for MAO activity and stress combined.
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PMID:Platelet monoamine oxidase activity and life stress as predictors of psychopathology and coping in a community sample. 272 12

The platelet is one of the most researched biological markers in psychiatry. Characteristics of MAO activity, 5-HT uptake, imipramine and alpha 2-adrenergic receptor binding, for example, are similar in platelet and CNS. Methodological factors are not negligible, and range from diagnostic specificity and drug effects to the normal physiological variability of age and hormone-related changes, circadian and seasonal rhythms. As yet, there are no clear state or trait platelet markers in affective disorders and schizophrenia that can be unequivocally used to detect vulnerability to the illness, predict therapeutic response, define clinical diagnostic entities or follow the course of the illness. However, platelet markers are increasingly being used in careful studies to monitor psychopharmacological effects (an in vivo assay of all active metabolites), different ligands can be specific markers for certain aspects of a psychiatric illness (e.g. alpha 2-adrenergic receptors and weight loss), and this homogeneous preparation of human cells is an increasingly important tool in studying mechanisms in pathophysiology. More longitudinal studies are required to establish functional relationships between platelet variables and psychopathology.
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PMID:Platelet research in psychiatry. 283 Oct 76

This paper has examined the possibilities of applying significant pharmacologic help to a variety of psychiatric problems that may accompany narcotic addiction. It has been shown that many of the patients do have such difficulties, with affective disorders being most common. As far as the various psychotropic drugs are concerned, neuroleptics for schizophrenia and lithium for manic disorders are generally agreed upon. A more extensive trial of lithium in a variety of situations seems indicated. Minor tranquilizers for anxiety and MAO-inhibitors for depression are both seen as problematic in this population--the former because of the possibility of abuse, the latter because of the danger of drug interaction associated with the addict's careless lifestyle. Tricyclic antidepressants may clearly have a role in treating major depression in opiate addicts on or off methadone, but the lability of the syndrome over time with frequent spontaneous remission argues against their routine use until it is clear that depression has persisted 3-6 months into methadone. Disulfiram appears to be a useful adjunct for drug abusers with serious alcohol problems. Psychotropic agents are most helpful to opiate addicts when used to treat coexisting psychopathology. While there is no clear evidence that such agents will reduce or affect the addiction itself, they may help keep patients available for rehabilitation efforts. Failure to intervene may make treatment dropout and recidivism more likely. Given the relative frequency of potentially treatable psychiatric disorders in these patients and the consequences of undiagnosed and untreated conditions, it is important for clinicians to maintain a high index of suspicion for concomitant psychiatric illness and for programs to have a mechanism for routinely diagnosing either all patients or, at a minimum, all patients not doing well. If programs used a standard instrument such as the SADS, it would be possible to compare various programs on this factor; in addition, it would provide a rich source of data for outcome studies.
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PMID:Brief effective treatment strategies: pharmacological therapy for opiate addicts. 286 55

Psychotropic agents are most helpful to opiate addicts when used to treat co-existing psychopathology. While such agents may not impact directly on the addiction itself, they might help keep patients available for rehabilitation efforts since concomitant severe psychopathology has been associated with poorer outcome. Neuroleptics for schizophrenia and lithium for manic disorders are generally agreed upon. Minor tranquilizers for anxiety and MAO inhibitors for depression may be too risky for this population. Tricyclic antidepressants clearly have a role in treating major depression in addicts but the lability of the syndrome over time argues against their routine use until the depression has persisted at least 3 months.
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PMID:The use of psychotropic drugs in the treatment of compulsive opiate abusers: the rationale for their use. 287 Jun 23

Despite the limitations of the dopamine hypothesis, compelling evidence remains that implicates dysfunction of CNS dopamine systems in the pathophysiology of schizophrenia. The longitudinal measurement of levels of plasma HVA has proved a useful tool in studying neuroleptic effects and has highlighted time-dependent effects as a potentially important facet of the mechanism of antipsychotic action of these drugs. Despite the good clinical correlates of plasma HVA levels, caution is needed in interpreting plasma levels of HVA with regard to CNS dopamine activity. The peripheral nervous system significantly contributes to levels of HVA that circulate in plasma. This issue is underscored by the fact that CSF HVA shows different neuroleptic response patterns than that seen in plasma. The administration of a peripherally acting MAO inhibitor to enhance the CNS "signal" in circulating levels of HVA does not resolve the "problem" of different CSF-plasma HVA neuroleptic response patterns. The possibility that mesocortical dopamine activity is reflected by CSF HVA is suggested by indirect evidence from clinical and preclinical studies. Future studies in which attempts are made at using both plasma and CSF HVA to enhance neurochemical and clinical correlates may help to advance our understanding of the contributions of specific CNS dopamine systems to schizophrenia.
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PMID:Plasma homovanillic acid as an index of central dopaminergic activity: studies in schizophrenic patients. 290 83

Psychopharmacological treatments of major psychiatric disorders during adolescence, including depression, anxiety disorders, schizophrenia, and attention-deficit disorder, are reviewed. Pharmacokinetic and psychological aspects specific to adolescence, which if ignored may impair or abolish drug efficacy, are examined. Recommendations are given for safe use of tricyclic antidepressants, monoamine oxidase inhibitors, and neuroleptics in this age group. Areas where future research is needed to make rational pharmacological choices are noted.
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PMID:Pharmacological treatment of adolescent psychiatric disorders. 310 18

Disturbances of central catecholaminergic-cholinergic balances have been discussed as causing affective disorders and schizophrenia. Such imbalances might be due to abnormalities of the metabolizing enzymes, especially their activities relative to each other. With this in mind, the activities of platelet monoamine oxidase and plasma butyrylcholinesterase (pseudocholinesterase) were determined spectrophotometrically in 33 psychiatric patients and eight controls. No significant differences could be detected for the enzyme activities as such and their relationship as expressed by their ratios. Thus, these peripheral enzymes seem to be unlikely indicators of supposed central imbalances.
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PMID:Reflection of central aminergic-cholinergic imbalance by peripheral enzymes in psychiatric disorders? 320 86


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