Differential expression of NDF/neuregulin receptors ErbB-3 and ErbB-4 and involvement in inhibition of neuronal differentiation

Oncogene
R Pinkas-KramarskiY Yarden

Abstract

Two receptor tyrosine kinases, ErB-3 and ErbB-4, mediate signaling by Neu differentiation factors (NDFs, also called neuregulins), while ErbB-1 and ErbB-2 serve as co-receptors. We show that the two NDF/neuregulin receptors differ in spatial and temporal expression patterns: The kinase-defective receptor, ErbB-3, is expressed primarily in epithelial layers of various organs, in the peripheral nervous system, and in adult brain, whereas ErbB-4 is restricted to the developing central nervous system and to the embryonic heart. An example of alternating expression of the two receptors is provided by the developing cerebellum: During postnatal cerebellar development, ErbB-4 expression slightly decreases along with a decline in NDF transcription, whereas ErbB-3 expression commences after the peak of neurogenesis. To study functional differences, we established primary brain cultures and found that ErbB-3 was expressed only in oligodendrocytes, whereas ErbB-4 expression was shared by oligodendrocytes, astrocytes and neurons. Blocking the action of endogenous NDF in vitro, by using a soluble form of ErbB-4, accelerated neurite outgrowth in both primary cultures and in neuronal-type cultures of the P19 teratocarcinoma, suggesting an inh...Continue Reading

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