The expression of phosphorylated extracellular signal-regulated kinase 1/2 (pERK 1/2) was evaluated in the vestibular nuclei (VN) of rats following unilateral labyrinthectomy (UL). Immunohistochemistry revealed a significant asymmetrical increase in pERK 1/2 expression in the VN, 5 min after UL, after which pERK 1/2 immunoreactivity decreased rapidly and was undetectable by 90 min after UL. These results suggest that unilateral deafferentation of the vestibular system triggers intracellular signal pathways that activate ERK 1/2 in the VN. © 2004 Elsevier B.V. All rigths reserved.
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