Parallel regulation by olanzapine of the patterns of expression of 5-HT2A and D3 receptors in rat central nervous system and blood cells.

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Padin JF, Rodriguez MA, Dominguez E, Dopeso-Reyes IG, Buceta M, Cano E, Sotelo E, Brea J, Caruncho HJ, Isabel Cadavid M, Castro M, Isabel Loza M

Parallel regulation by olanzapine of the patterns of expression of 5-HT2A and D3 receptors in rat central nervous system and blood cells.

Neuropharmacology. 2006 Sep;51(4):923-32. Epub 2006 Aug 14.

PubMed ID

16905159 [ View in PubMed

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Abstract

Patterns of protein expression can be used to identify biomarkers of disease, prognosis or treatment response. Peripheral 5-HT2A and D3 receptors have been proposed as protein markers in schizophrenia. We investigated the possible parallel regulation of these candidate biomarkers in central nervous system (CNS) and peripheral blood cells by a comparative study of the effects of antipsychotic treatment on the expression of the receptors in both systems in rats. Acute (24 and 48 h) and subchronic (16 days) treatment of rats with olanzapine induced a significant decrease in 5-HT2A receptor density both in frontal cortex (Bmax=76.2%, 83.0% and 46.0% of control after 24 h, 48 h and 16 days of treatment, respectively; P<0.01) and blood platelets (Bmax approximately 55% of control at all times measured; P<0.01), without any changes in receptor affinity. Furthermore, olanzapine induced redistribution in 5-HT2A-like immunoreactivity and time-dependent remodelling of synaptic circuits involved in the activity of pyramidal and GABAergic neurons in frontoparietal motor cortex of treated rats, as assessed by immunohistochemical studies. D3 receptor mRNA levels increased significantly by 52.5% (P<0.01) and 21.1% (P<0.05) in nucleus accumbens, and by 53.4% (P<0.05) and 91.7% (P<0.01) in lymphocytes, after acute (24 h and 48 h) treatment with olanzapine, returning to levels similar to control after subchronic treatment (16 days). In conclusion, we observed in rats after olanzapine treatment: (1) parallelism in the regulation of 5-HT2A receptors in frontal cortex and in blood platelets; (2) parallelism in the regulation of D3 mRNA levels in nucleus accumbens and lymphocytes. These results endorse the interest in future studies aimed at validating these receptors as candidate biomarkers in schizophrenia.

DrugBank Data that Cites this Article

Drug Targets

Drug	Target	Kind	Organism	Pharmacological Action	Actions
Olanzapine	5-hydroxytryptamine receptor 2A	Protein	Humans	Yes	Antagonist	Details