Journal
NEUROPHARMACOLOGY
Volume 75, Issue -, Pages 416-425Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.neuropharm.2013.08.008
Keywords
Activin; Brain-derived neurotrophic factor; Erythropoietin; Spiral ganglion neurons; Inner ear
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Funding
- DFG (Deutsche Forschungsgemeinschaft)
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Activins are regulators of embryogenesis, osteogenesis, hormones and neuronal survival. Even though activin receptor type II has been detected in spiral ganglion neurons (SGN), little is known about the role of activins in the inner ear. An activin-mediated neuroprotection is of considerable clinical interest since SGN are targets of electrical stimulation with cochlear implants in hearing impaired patients. Thus, the presence of activin type-I and type-II receptors was demonstrated immunocytochemically and the individual and combined effects of activin A, erythropoietin (EPO) and brain-derived neurotrophic factor (BDNF) on SGN were examined in vitro. SGN isolated from neonatal rats (P 3-5) were cultured in serum-free medium supplemented with activin A, BDNF and EPO. Compared to the negative control, survival rates of SGN were significantly improved when cultivated individually with activin A (p < 0.001) and in combination with BDNF (p < 0.001). Neither neurite outgrowth nor neuronal survival was influenced by the addition of EPO to activin A-treated neurons. However, when all three factors were added, a significantly (p < 0.001) improved neuronal survival was observed (61.2 +/- 3.6%) compared to activin A (25.4 +/- 2.1%), BDNF (22.8 +/- 3.3%) and BDNF + EPO (19.2 +/- 1.5%). Under the influence of the EPO-inhibitors, this increase in neuronal survival was blocked. Acting with BDNF and EPO to promote neuronal survival in vitro, activin A presents an interesting factor for pharmacological intervention in the inner ear. The present study demonstrates a synergetic effect of a combined therapy with several trophic factors. (C) 2013 Elsevier Ltd. All rights reserved.
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