Postnatal changes in constitutive cyclooxygenase‑2 expression in the mice hippocampus and its function in synaptic plasticity

Jung,Hyo Young; Yoo,Dae Young; Nam,Sung Min; Kim,Jong Whi; Kim,Woosuk; Kwon,Hyun Jung; Lee,Kwon Young; Choi,Jung Hoon; Kim,Dae Won; Yoon,Yeo Sung; Seong,Je Kyung; Hwang,In Koo

doi:10.3892/mmr.2019.9867

Postnatal changes in constitutive cyclooxygenase‑2 expression in the mice hippocampus and its function in synaptic plasticity

Authors:
- Hyo Young Jung
- Dae Young Yoo
- Sung Min Nam
- Jong Whi Kim
- Woosuk Kim
- Hyun Jung Kwon
- Kwon Young Lee
- Jung Hoon Choi
- Dae Won Kim
- Yeo Sung Yoon
- Je Kyung Seong
- In Koo Hwang
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Affiliations: Department of Anatomy and Cell Biology, College of Veterinary Medicine, and Research Institute for Veterinary Science, Seoul National University, Seoul 08826, Republic of Korea, Department of Biochemistry and Molecular Biology, Research Institute of Oral Sciences, College of Dentistry, Gangneung‑Wonju National University, Gangneung, Gangwon 25457, Republic of Korea, Department of Anatomy, College of Veterinary Medicine and Institute of Veterinary Science, Kangwon National University, Chuncheon, Gangwon 24341, Republic of Korea
Published online on: January 15, 2019 https://doi.org/10.3892/mmr.2019.9867
Pages: 1996-2004
Copyright: © Jung et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Although the expression of cyclooxygenase-2 (COX-2) is closely associated with inflammation in the brain, it is constitutively expressed in the brain, and its expression is regulated by synaptic activity. The present study investigated postnatal expression of COX‑2 in the hippocampus in C57BL/6 mice at postnatal days (P) 1, 7, 14, 28, and 56. In addition, the presented study examined the effects of COX‑2 on synaptic plasticity through Arc, phosphorylated cAMP response element‑binding protein (pCREB), N‑methyl‑d‑aspartate receptor 1 (GluN1), and GluN2A/2B immunohistochemistry, which was performed on COX‑2 knockout (KO) and wild‑type (WT) mice. Extremely weak COX‑2 immunoreactivity was detected in the hippocampal CA1‑3 areas in addition to the dentate gyrus at P1. Conversely, COX‑2 immunoreactivity was observed in the stratum pyramidale of the CA1‑3 regions and in the outer granule cell layer of the dentate gyrus at P7. Additionally, although peak COX‑2 immunoreactivity was observed in all hippocampal sub‑regions, including the dentate gyrus at P14, it was significantly decreased at P14. Finally, COX‑2 immunoreactivity and the distribution pattern seen at P56 in the hippocampal CA1‑3 regions were similar to those observed at P28, whereas, they were identified in the inner half of the granule cell layer of the dentate gyrus. The western blot analysis revealed that the COX‑2 protein levels peaked at P14 and were decreased at P28 and P56. Additionally, the number of Arc and pCREB immunoreactive cells as well as GluN1 and GluN2A/2B immunoreactivity of COX‑2 KO mice were significantly decreased in the dentate gyrus when compared with that in WT mice. Taken together, the results of the present study suggest that COX‑2 serves an important role in synaptic plasticity in the dentate gyrus and changes in the levels of its constitutive expression are associated with the hippocampal dentate gyrus postnatal development.

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