Embryonic expression pattern of H218, a G-protein coupled receptor homolog, suggests roles in early mammalian nervous system development

Neuroscience
A John MacLennanN Lee

Abstract

Heterologous expression studies employing mammalian cell tissue culture techniques and in vivo studies of lower eukaryotes suggest that G-protein coupled receptors may play critical roles in regulating early stages of vertebrate nervous system development. Previous work suggests that H218, a rat G-protein coupled receptor homolog, could serve such a role. Most importantly, northern blot data indicate that whole brain H218 mRNA levels are highest during embryogenesis. In the present studies we raised, affinity-purified and characterized several anti-H218, polyclonal antisera and immunohistochemically mapped the expression of H218 during the early stages of rat embryonic nervous system development. The resulting data indicate that H218 is preferentially expressed in young, differentiating neuronal cell bodies and axons. Moreover, the expression is temporally regulated such that highest H218 levels are found in neuronal cell bodies during their early stages of differentiation and in axons during their outgrowth. Therefore, we propose that H218 signal transduction may widely participate in the regulation of some of the first steps in neuronal differentiation including axon outgrowth.

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