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Journal of Child Neurology
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Regional Expression of Dopamine D1 and D2 Receptor Proteins in the Cerebral Cortex of Asphyxic Newborn Infants

Sukit Kaewsuk, MSc

Neuro-Behavioural Biology Center, Institute of Science and Technology for Research and Development, Mahidol University, Thailand

Rudi K. Tannenberg, PhD

School of Molecular and Microbial Sciences, University of Queensland

Sheng-Wen Kuo, PhD

School of Molecular and Microbial Sciences, University of Queensland

S. Tracey Björkman, PhD

Perinatal Research Centre, Royal Brisbane and Women's Hospital

Piyarat Govitrapong, PhD

Neuro-Behavioural Biology Center, Institute of Science and Technology for Research and Development, Mahidol University, Thailand

Alfreda Stadlin, PhD

School of Medical Sciences, Griffith University, Australia

Peter R. Dodd, PhD

School of Molecular and Microbial Sciences, University of Queensland, p.dodd{at}uq.edu.au

Dopamine D1 and D2 receptor protein expression was examined by Western blotting in newborn infants dying from cerebral asphyxia between 31 and 42 weeks' gestation, and matched controls. Frontal, occipital, temporal, and motor cortex tissue samples were obtained at autopsy (median postmortem interval 35 hours) and frozen for storage at —80°C. A total of 2 immunoreactive bands were detected with each primary antibody in infant brain, whereas a single band was present in adult human and rat tissue. Immunoreactivity varied between cortical areas for both receptors, but their regional patterns differed significantly. D1 protein levels were higher in motor and temporal cortex than in frontal or occipital cortex. D2 protein showed graded expression frontal > motor > occipital > temporal cortex. Asphyxia cases showed lower expression of the upper D2 immunoreactive band, but no difference in regional pattern. Lower D2 receptor expression may attenuate stress responses and underlie increased vulnerability to hypoxia at birth.

Key Words: perinatal • autopsy • stress response • dopamine • receptor protein • asphyxia

Journal of Child Neurology, Vol. 24, No. 2, 183-193 (2009)
DOI: 10.1177/0883073808322669
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