Neurotrophic effect of gonadotropin-releasing hormone on neurite extension and neuronal migration of embryonic gonadotropin-releasing hormone neurons in chick olfactory nerve bundle culture
| Autor: | Shizuko Murakami, Min Kyun Park, Yoh-Ichiro Kanaho, Sayaka Maehiro, Daisuke Endo, Masahiro Enomoto |
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| Rok vydání: | 2009 |
| Předmět: |
endocrine system
medicine.medical_specialty Olfactory Nerve Neurite Chick Embryo Gonadotropin-releasing hormone Biology Gonadotropin-Releasing Hormone Tissue Culture Techniques Cellular and Molecular Neuroscience Hormone Antagonists Olfactory nerve Cell Movement Internal medicine Neurites medicine Animals RNA Messenger Neurons Matrigel Dose-Response Relationship Drug Embryogenesis Cell migration Drug Combinations Endocrinology nervous system Forebrain biology.protein Proteoglycans Collagen Laminin hormones hormone substitutes and hormone antagonists Neurotrophin |
| Zdroj: | Journal of Neuroscience Research. 87:2237-2244 |
| ISSN: | 1097-4547 0360-4012 |
| DOI: | 10.1002/jnr.22051 |
| Popis: | Hypothalamic gonadotropin-releasing hormone (GnRH) neurons play a pivotal role in regulating the reproductive function of vertebrates. These neurons are known to originate in the olfactory placode and migrate along olfactory-related axons to reach the forebrain during embryonic development. Although GnRH is suggested to be secreted during such migration, its physiological significance is unknown. This point is difficult to explore in vivo because recent studies suggest that GnRH is an important factor for normal brain development and that modification of the embryonic GnRH system by exogenous GnRH analogue or genetic methods would result in dysgenesis of the brain. Therefore, to study the role of GnRH in the migratory process of GnRH neurons, we established an in vitro chick embryonic olfactory nerve bundle explant model. Embryonic day 7.5-8 olfactory nerve bundles were cultured in a mixture of Matrigel and collagen gel. At day 3 of culture, GnRH neurons extended their unbranched neurites and migrated out from both edges of the explant. The nature of neurite extension and migratory behavior of GnRH neurons was well maintained in the gel containing 25% Matrigel and 50% collagen. With this culture system, we examined the effect of GnRH on the migrating GnRH neurons. Cetrorelix, a GnRH antagonist, was found to inhibit significantly neurite growth and neuronal migration of GnRH neurons, the effects of which were repressed by the addition of chicken GnRH-I. These results suggest that GnRH functions as one of the regulating factors of GnRH neuronal development by promoting neurite extension and neuronal migration. |
| Databáze: | OpenAIRE |
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