Differentiated dopaminergic MN9D cells only partially recapitulate the electrophysiological properties of midbrain dopaminergic neurons.

Abstract:

:The cell line MN9D, a fusion of embryonic ventral mesencephalic and neuroblastoma cells, is extensively used as a model of dopamine (DA) neurons because it expresses tyrosine hydroxylase and synthesizes and releases DA. These cells are also used to test mechanisms and potential therapeutics relevant to the loss of DA neurons in Parkinson's disease. To date, little work has been done to determine whether MN9D cells electrophysiologically resemble mature DA neurons. We examined sodium, calcium and potassium currents in undifferentiated and differentiated MN9D cells, and compared these to those found in acutely dissociated mouse substantia nigra pars compacta DA neurons. It was observed that undifferentiated MN9D cells bore no resemblance to DA neurons. Upon differentiation with butyric acid with or without a prior treatment with glial cell line-derived neurotrophic factor, differentiated MN9D cells produce an electrophysiological profile that more closely resembles substantia nigra pars compacta DA neurons even though the A-type potassium current remains noticeably absent. These observations demonstrate that undifferentiated MN9D cells are not reasonable models of DA neurons. Although differentiated MN9D cells are closer to the mature DA neuronal phenotype, they do not fully mimic DA neurons and are likely to be of questionable value as a model because of their substantive differences, including the lack of the characteristic A-type potassium current. The future use of one or a combination of growth or other factors to differentiate MN9D cells may yield a more useful model system for Parkinson's disease studies in vitro.

journal_name

Dev Neurosci

authors

Rick CE,Ebert A,Virag T,Bohn MC,Surmeier DJ

doi

10.1159/000095115

subject

Has Abstract

pub_date

2006-01-01 00:00:00

pages

528-37

issue

6

eissn

0378-5866

issn

1421-9859

pii

95115

journal_volume

28

pub_type

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