Abstract
Introduction
Catechol-O-methyltransferase (COMT) has soluble (S-COMT) and membrane bound (MB-COMT) isoforms. Our aims were to assess the behavioral phenotype of S-COMT mutant mice and to clarify the role of MB-COMT in dopamine metabolism in different brain areas.
Methods
Behavioral phenotype of the S-COMT mutant mice was assessed using a test battery designed to describe anxiety phenotype, spontaneous locomotor activity, sensorymotor gating, social behavior, and pain sensitivity. Microdialysis was used to explore the effect of S-COMT deficiency on extracellular dopamine under an L-dopa load (carbidopa /L-dopa 30/10 mg/kg i.p.).
Results
In behavioral tests, mature adult S-COMT mutants that only possessed MB-COMT exhibited enhanced acoustic startle without alterations in sensorimotor gating. They also showed barbering of vibrissae and nonaggressive social dominance, suggesting a change in their social interactions. In addition, S-COMT deficiency slightly and sex-dependently affected spinal pain reflex and the effect of morphine on hot-plate latency. In microdialysis studies under L-dopa load, S-COMT mutants of both sexes had higher accumbal dopamine levels, but male S-COMT mutant mice showed paradoxically lower prefrontal cortical dopamine concentrations than wild-type animals. S-COMT deficiency induced the accumulation of 3,4-dihydroxyphenylacetic acid in all brain areas, which was accentuated after L-dopa loading. The lack of S-COMT decreased extracellular homovanillic acid levels. However, after L-dopa loading, homovanillic acid concentrations in the prefrontal cortex of S-COMT mutants were similar to those of wild-type mice.
Conclusion
A lack of S-COMT has a notable, albeit small, brain-area and sex-dependent effect on the O-methylation of dopamine and 3,4-dihydroxyphenylacetic acid in the mouse brain. It also induces subtle changes in mouse social interaction behaviors and nociception.
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Acknowledgements
The authors thank Ms Anna Niemi and Mrs Kati Rautio for excellent technical assistance. These studies were supported by a grant from the Academy of Finland (No. 1131915/2008 and No. 117881/2006) and Sigrid Juselius Foundation to PTM.
Conflict of interest
The authors do not have a financial relationship with the organizations that sponsored the research. The authors have full control of all primary data, and the journal is allowed to review the data upon request.
Ethical standards
All procedures with animals were performed according to European Community Guidelines for the use of experimental animals (European Communities Council Directive 86/609/EEC), EU Commission recommendation on guidelines for the accommodation and care of animals used for experimental and other scientific purposes (2007/526/EC), and Finnish Act on the Use of Animals for Experimental Purposes. Research plan was reviewed and approved by the Animal Experiment Board of the Provincial Office in Southern Finland.
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Online Resource 1
COMT activities in the female and male kidney membrane fractions of S-COMT mutant and wild-type mice (DOC 530 kb)
Online Resource 2
Behavioral test battery (DOC 33 kb)
Online Resource 3
Quantification of dopamine and dopamine metabolites in brain dialysates (DOC 28 kb)
Online Resource 4
Motor activity of S-COMT mutant and wild-type mice (DOC 32 kb)
Online Resource 5
The effect of S-COMT deficiency on stress-induced analgesia in the tail flick test, in the hot plate test, mechanic nociceptive thresholds as well as in inflammatory pain in male and female mice (DOC 1641 kb)
Online Resource 6
The area under the concentration curve values in the dorsal striatum, nucleus accumbens, and prefrontal cortex after carbidopa/l-dopa treatment (DOC 40 kb)
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Tammimäki, A., Käenmäki, M., Kambur, O. et al. Effect of S-COMT deficiency on behavior and extracellular brain dopamine concentrations in mice. Psychopharmacology 211, 389–401 (2010). https://doi.org/10.1007/s00213-010-1944-2
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DOI: https://doi.org/10.1007/s00213-010-1944-2