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Dopaminergic retinal cell differentiation in culture: modulation by forskolin and dopamine
Author(s) -
Guimarães Marília Zaluar P.,
Hokoç Jan Nora,
Duvoisin Robert,
Reis Ricardo A. M.,
De Mello Fernando Garcia
Publication year - 2001
Publication title -
european journal of neuroscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.346
H-Index - 206
eISSN - 1460-9568
pISSN - 0953-816X
DOI - 10.1046/j.0953-816x.2001.01575.x
Subject(s) - tyrosine hydroxylase , dopaminergic , dopamine , endocrinology , medicine , biology , forskolin , quinpirole , population , retina , dopamine transporter , microbiology and biotechnology , chemistry , neuroscience , environmental health , stimulation
We examined the effects of dopamine and cAMP on the differentiation of dopaminergic retinal cells in the chick retina, using an in vitro system and tyrosine hydroxylase immunocytochemistry. Tyrosine hydroxylase‐positive cells were detected in cultures prepared from embryonic day 10 retinas. These increased in number as a function of time in vitro and by treatment for 4 days with forskolin. Besides causing a 3.4‐fold increase in the tyrosine hydroxylase‐positive population, forskolin also caused these cells to developed morphogenetic features of more mature cells. As opposed to forskolin, cultures treated with dopamine exhibited a 55% reduction of the tyrosine hydroxylase‐positive cell population, as compared to untreated cultures. Quinpirole was able to mimic the dopamine effect. This dopamine effect could only be blocked by clozapine, whereas raclopride and eticlopride were ineffective. Our results suggest the existence of a narrow window during development when undifferentiated dopaminergic cells are capable of being influenced by specific signals, possibly via cAMP production. The data also indicate that dopamine may act as a regulatory factor limiting the tyrosine hydroxylase‐positive population in the retina.