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Characterization of dopamine‐induced depolarization of prefrontal cortical neurons
Author(s) -
Shi WeiXing,
Zheng Ping,
Liang XiaoFu,
Bunney Benjamin S.
Publication year - 1997
Publication title -
synapse
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.809
H-Index - 106
eISSN - 1098-2396
pISSN - 0887-4476
DOI - 10.1002/(sici)1098-2396(199708)26:4<415::aid-syn9>3.0.co;2-9
Subject(s) - depolarization , neuroscience , dopamine , chemistry , substantia nigra , prefrontal cortex , striatum , biophysics , dopaminergic , biology , cognition
Dopamine (DA) has been reported to depolarize neurons in the prefrontal cortex (PFC). To further characterize this effect of DA, we made whole cell recordings from PFC pyramidal cells in rat brain slices. As reported previously, DA depolarized most PFC cells tested. This effect of DA was concentration‐dependent and persisted in the presence of synaptic blockade, indicating a direct effect of DA on the recorded cell. During DA‐induced depolarization, PFC neurons consistently showed an increase in excitability, suggesting that the depolarization is not directly related to DA‐induced inhibition of PFC neurons previously observed in vivo. Surprisingly, the effect of DA was not mimicked or blocked by several commonly used DA agonists and DA antagonists. The α and β antagonists phentolamine and alprenolol and the atypical antipsychotic drug clozapine also showed no significant effect on DA‐induced depolarization. These results suggest that DA‐induced depolarization may be mediated by a nonspecific mechanism. However, it remains possible that there exists a new type of DA receptors in the PFC not sensitive to classical DA agonists and antagonists, particularly given the fact that DA applied in the same manner depolarized only PFC neurons but not those in the striatum or the substantia nigra. Synapse 26:415–422, 1997. © 1997 Wiley‐Liss Inc.