Early postnatal repeated maternal deprivation causes a transient increase in OMpg and BDNF in rat cerebellum suggesting precocious myelination

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• 作者：Takanori Miki ; Toshifumi Yokoyama ; Takashi Kusaka ; Shingo Suzuki ; Ken-ichi Ohta ; Katsuhiko Warita ; Zhi-Yu Wang ; Masaaki Ueki ; Kazunori Sumitani ; Frederick P. Bellinger ; Motoki Tamai ; Jun-Qian Liu ; Tomiko Yakura ; Yoshiki Takeuchi
• 关键词：Cerebellum ; Development ; Maternal deprivation ; Myelination ; Stress ; Neurotrophic factor
• 刊名：Journal of the Neurological Sciences
• 出版年：15 January, 2014
• 年：2014
• 卷：336
• 期：1-2
• 页码：62-67
• 全文大小：508 K

文摘

Repetitive maternal deprivation (MD) of neonatal rats during early life is known as one of the strongest stressors to pre-weaned animals. There is increasing evidence that the cerebellum is involved in cognition and emotion. In the present study, we examined how neurotrophic factors and myelin-associated molecules and their receptors (NGF, BDNF, OMgp, TrkA, TrkB, p75 NTR, and NgR) in the cerebellum are affected by early postnatal maternal separation. Rat pups were separated from their mothers for 3 h/day during postnatal days (PND) 10-15. At PND 16 and 30, the levels of mRNA and protein in the cerebellum were determined using real-time PCR and Western blot analysis. Cerebellar mRNA and protein levels of BDNF, TrkB, and OMgp were significantly increased in MD rats at PND 16. However, by PND 30 these variables normalized to control levels. In contrast, the levels of mRNA and protein for NGF, TrkA, p75 NTR, and NgR were unchanged at both ages examined. Transient enhancement of neurotrophic system and myelin-associated molecule expression may cause interference of normal development of the cerebellum such as precocious myelination, which may lead to functional and cognitive deficits later in life.