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The objective of the present study was to investigate the possibility of using L-lysine, an amino acid that occurs naturally in food and which interferes with nitric oxide (NO) production, for the treatment of schizophrenia. L-lysine, 6 g/day, was administered to ten patients with schizophrenia as an add-on treatment to conventional antipsychotic treatment. The study was designed as a single-blinded, cross-over study where patients were randomly assigned to initial treatment with either L-lysine or placebo and screened at baseline, after four weeks when treatment was crossed over, and after eight weeks when treatment was terminated. The four-week L-lysine treatment regimen caused a significant increased in blood concentration of the amino acid and was tolerated well. The analysis of outcome measures showed a significant decrease in symptom severity as measured by the Positive and Negative Syndrome Scale (PANSS). Furthermore, the patient's ability to solve the Wisconsin Card Sorting Task (WCST) was significantly improved indicating increased problem solving capacity and cognitive flexibility. Subjective reports from three of the patients also indicated decreased symptom severity and enhanced cognitive functioning. In summary, these findings suggest potential beneficial effects of L-lysine treatment on symptom severity and cognitive deficits in patients with schizophrenia.
Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Crossover Assignment, Masking: Single Blind (Subject), Primary Purpose: Treatment
Sahlgrenska Univeristy Hospital
SE 405 30
Published on BioPortfolio: 2014-08-27T03:18:39-0400
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Schizophrenia is a major psychiatric disorder with complex genetic, environmental, and psychological etiologies. Although DISC1 gene has been shown as a risk factor for schizophrenia in some reports, ...
A chronic form of schizophrenia characterized primarily by the presence of persecutory or grandiose delusions, often associated with hallucination.
A type of schizophrenia characterized by abnormality of motor behavior which may involve particular forms of stupor, rigidity, excitement or inappropriate posture.
An obsolete concept, historically used for childhood mental disorders thought to be a form of schizophrenia.
An enzyme that activates lysine with its specific transfer RNA. EC 22.214.171.124.
A PYRIDOXAL PHOSPHATE containing enzyme that catalyzes the transfer of amino group of L-LYSINE onto 2-oxoglutarate to generate 2-aminoadipate 6-semialdehyde and L-GLUTAMATE.
Food is any substance consumed to provide nutritional support for the body. It is usually of plant or animal origin, and contains essential nutrients, such as carbohydrates, fats, proteins, vitamins, or minerals. The substance is ingested by an organism ...
Psychiatry is the study of mental disorders and their diagnosis, management and prevention. Conditions include schizophrenia, severe depression and panic disorders among others. There are pharmaceutical treatments as well as other therapies to help...