> Cognitive Behavioral Therapy for Psychosis and Schizophrenia Glycine - A possible complementary therapy for schizophrenia (May, 2006 update) INTRODUCTION A novel approach to the treatment of schizophrenia involving glutamatergic neurotransmission and its modulation with simple amino acids is beginning to generate interest among psychiatrists. Not only are more research studies being published in the psychiatric literature but there was an entire workshop on the topic at the most recent meeting of the meeting in Toronto this past May (2006).
CONVENTIONAL THEORIES Traditionally, schizophrenia has been thought to be a disease involving the neurotransmitter dopamine. In the early 1950s, it was found that chlorpromazine which was originally developed as an anti-nausea treatment also helped improve psychotic symptoms. It helped relieve the positive symptoms of psychosis by blocking dopamine in the brain.
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Neurons in the brain are not connected to each other but are separated by gaps called synapses. Chemical messengers are released by one neuron and are received by specialized receptors on the ends of the opposite neuron. The messages they convey are then transmitted down the neuron. Dopamine is one such chemical messenger or neurotransmitter. Chlorpromazine acts as an antagonist to dopamine and blocks the dopamine receptors on the ends of neurons. This prevents dopamine from binding to the receptor and sending its message down the neuron.
As chlorpromazine helped reduce psychotic symptoms, it was thus believed that schizophrenia was a disease of either too much dopamine or too many dopamine receptors. This theory was further supported by the observations that amphetamines and LSD produce hallucinations similar to schizophrenia. These drugs are dopamine agonists that mean that they mimic the action of dopamine in the brain. Their presence has the same effect as increasing the amount of dopamine. Blocking dopamine helped to relieve psychotic symptoms while increasing dopamine produced psychotic like symptoms. These early antipsychotics that only influenced the dopamine system tend to be only effective for the treatment of the positive symptoms of schizophrenia and are not effective for the negative ones.
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This led to the consideration that other neurotransmitters might also be involved with the disease. The newer atypical antipsychotics that have been developed in recent years, therefore, influence not only the dopaminergic systems but also effect serotonin - another of the neurotransmitters in the brain. These newer drugs reduce dopamine activity in some parts of the brain and increase serotonin activity in other parts. THE PCP THEORY Over the past few years, attention has been focused on the glutamatergic system involving agents that block N-methyl-d-aspartate or NMDA. Glutamic acid is the major excitatory neurotransmitter in the brain involving 40% of all synapses. Two street drugs, PCP (angel dust) and (the date rape drug) are known to cause behavior that closely resembles that of schizophrenia.