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)

There exist clinical characteristics of methamphetamine (MAP) psychosis in the Japanese population. MAP psychosis involves paranoid-hallucinatory states indistinguishable from paranoid schizophrenia, with residual volitional disturbances (e.g., loss of spontaneity and idleness). Paranoid-hallucinatory states persist after the pharmacological effects of MAP have worn off and readily reappear upon a reinjection of MAP. Individuals with a history of MAP psychosis further undergo spontaneous recurrence of their paranoid-hallucinatory states in response to stress. The development of MAP psychosis might therefore be related to persisting brain damage or changes in brain metabolism induced by repeated MAP use, and thus studies of the clinical course and neurological basis of MAP psychosis could provide insights into the pathophysiology of schizophrenia. Accordingly, psychiatrists have studied the clinical characteristics of MAP psychosis and examined the neurobiological basis of MAP-induced behavioral sensitization, using animals. MAP-induced behavioral sensitization might well be related to dopamine supersensitivity; however, the contribution of presynaptic autoreceptors remains controversial, and other hypotheses should be considered. Recently, the process that triggers spontaneous recurrence of MAP psychosis (flashbacks) and corresponding peripheral neurotransmitter functions has been studied. Stress sensitization associated with noradrenergic hyperactivity, involving increased dopamine release, appears to be crucial in the development of flashbacks. Overall, MAP-induced susceptibility to paranoid-hallucinatory states and to abnormal behavior (e.g., stereotyped behavior) in animals is examined as a model for predicting relapses of paranoid schizophrenia. Further extensive studies on the neurobiological and molecular mechanisms of this susceptibility are required.
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PMID:Studies of amphetamine or methamphetamine psychosis in Japan: relation of methamphetamine psychosis to schizophrenia. 1108 3

In this study, we examined the relationship between increased sensitivity to stress associated with noradrenergic hyperactivity and dopaminergic changes, and susceptibility to subsequent spontaneous recurrences of methamphetamine (MAP) psychosis (i.e., flashbacks). The subjects were 81 physically healthy females. Plasma monoamine metabolite levels were assayed in: 19 flashbackers, of whom 11 experienced a single flashback and 8 exhibited subsequent flashbacks; 20 non-flashbackers with a history of MAP psychosis; 8 subjects with persistent MAP psychosis; and 23 MAP users and 11 non-user controls. All 19 flashbackers had undergone frightening and stressful experiences during previous MAP use. Mild psychosocial stressors then triggered their flashbacks. During flashbacks, plasma norepinephrine levels increased, with a small increase in plasma levels of 3-methoxytyramine, which is an index of dopamine release. Among the 19 flashbackers, the 8 with subsequent episodes had increased NE levels and slightly increased 3-methoxytyramine levels, while the 11 with a single episode displayed small increases in norepinephrine and 3-methoxytyramine levels. Thus, noradrenergic hyperactivity and increased dopamine release in response to mild psychosocial stressors may be responsible for the development of flashbacks. Robust noradrenergic hyperactivity with slightly increased DA release in response to mild stress may induce susceptibility to subsequent flashbacks. Flashbacks and schizophrenia may share the pathophysiology of susceptibility to recurrence of paranoid-hallucinatory states such as stress sensitization, and also noradrenergic hyperactivity and enhanced DA release. Thus, flashbacks may provide an appropriate model of susceptibility to paranoid-hallucinatory states of schizophrenia. The model psychosis is a potential tool for validating basic neurobiological concepts thought to be related to the schizophrenia. A better understanding of the neurobiological mechanisms of susceptibility to recurrence could provide useful information in the development of strategies for preventing relapse.
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PMID:Spontaneous recurrence of methamphetamine-induced paranoid-hallucinatory states in female subjects: susceptibility to psychotic states and implications for relapse of schizophrenia. 1195 Nov 47

Setting oneself ablaze is an uncommon method of attempting suicide. Ten patients with deliberate thermal injuries had been evaluated by a consultation psychiatry service over a 15-year period. Schizophrenia and major depression were the more common diagnoses, and most patients had prior psychiatric histories. When compared to 1,864 people who attempted suicide by other means, the burn subjects were older, comprised a larger percentage of African Americans, and resembled those who had jumped from high places. Stresses encountered by recovering burn patients involved dependency, body image concerns, exacerbation of pre-existing depression, pain, flashbacks of the incident, and guilt intensified by their proximity to accidentally burned victims. Problems for burn unit staff included feelings of discomfort with difficult, potentially suicidal individuals, and responsibilities to perform painful procedures. Recommendations for psychiatric care include pharmacotherapy for depression or psychosis, visitation by previously self-burned individuals who serve as role models, patients' visualization of their injuries, and behavioral techniques to diminish reliance on analgesic drugs and to increase a personal sense of control. Suggestions for assisting staff include liaison support, personnel debriefing sessions, and inservice presentations on emotional aspects of burn management.
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PMID:Suicide attempts by burning. 1708 43

Association between cannabis use and various psychiatric syndromes does exist, but their nature remains elusive. Cannabis intoxication, 'cannabis psychosis' and certain other conditions related with cannabis use like flashbacks and prolonged depersonalization are discussed in this paper. The controversial nature of the cannabis - schizophrenia link is noted, and various methodological issues in clinical cannabis research are highlighted.
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PMID:Cannabis related psychiatric syndromes: a selective review. 2174 86

Endoplasmic reticulum (ER) protein sigma-1 receptor represents unique chaperone activity in the central nervous system, and it exerts a potent influence on a number of neurotransmitter systems. Several lines of evidence suggest that activation of sigma-1 receptor plays a role in the pathophysiology of neuropsychiatric diseases, as well as in the mechanisms of some therapeutic drugs and neurosteroids. Preclinical studies showed that some selective serotonin reuptake inhibitors (SSRIs; fluvoxamine, fluoxetine, excitalopram), donepezil, and ifenprodil act as sigma-1 receptor agonists. Furthermore, sigma-1 receptor agonists could improve the N-methyl-D-aspartate (NMDA) antagonist phencyclidine (PCP)-induced cognitive deficits in mice. A study using positron emission tomography have demonstrated that an oral administration of fluvoxamine or donepezil could bind to sigma-1 receptor in the healthy human brain, suggesting that sigma-1 receptor might be involved in the therapeutic mechanisms of these drugs. Moreover, case reports suggest that sigma-1 receptor agonists, including fluvoxamine, and ifenprodil, may be effective in the treatment of cognitive impairment in schizophrenia, delirium in elderly people, and flashbacks in post-traumatic stress disorder. In this review article, the author would like to discuss the clinical implication of sigma-1 receptor agonists, including endogenous neurosteroids, in the neuropsychiatric diseases.
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PMID:Activation of sigma-1 receptor chaperone in the treatment of neuropsychiatric diseases and its clinical implication. 2570 12

This paper presents the general characteristics of the phenomenon of autobiographical memory (AM), the current knowledge of the subject and describes hitherto identified distortions of AM in mental disorders.AM is the part of memory concerning the personal past of an individual. It includes episodic and semantic memories associated with an identity. It affects an activity and structuring of goals, it is set in human experience and emotions and it helps in creating plans. The evolutionary sig-nificance of AM is probably to facilitate short-term goal-oriented behaviors by comparing them with the previous ones. People with AM disorders often have difficulties in social functioning.The disorders of emotional life and affect, which are present in most psychiatric disorders, deform AM. It was confirmed, inter alia, in post-traumatic stress disorder, depression, autism, schizophrenia, and alcohol dependence syndrome. Overgeneral memories (the inability to recall memories that are fully filled with details) being typical of depression, and flashbacks (the involuntary recall of memories which are highly filled with visual-sensory content) being characteristic of PTSD are considered one of the most studied deficiency of AM. The study of AM potentially carries many cognitive and clinical implications. It may facilitate the prediction of the onset of a depressive episode in patients at risk; it can also help to develop psychotherapeutic techniques which are helpful in its treatment, which has in part already taken place. Few studies relate to neurofunctional changes in AM and they need a follow-up.
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PMID:Autobiographical memory and its meaning in selected mental disorders. 2799 89