Preferential localization of prostamide/prostaglandin F synthase in myelin sheaths of the central nervous system

Keisuke Yoshikawa, Shiro Takei, Sanae Hasegawa-Ishii, Yoichi Chiba, Ayako Furukawa, Noriko Kawamura, Masanori Hosokawa, David F. Woodward, Kikuko Watanabe, Atsuyoshi Shimada

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Abstract

Prostaglandin (PG) F is a product of cyclooxygenase (COX)-catalyzed metabolism of arachidonic acid and exerts biological functions in various tissues. Prostaglandin ethanolamide (prostamide) F is a COX-2-catalyzed metabolite of arachidonoyl ethanolamide (anandamide) that induces pharmacological actions in ocular tissues. Although PGF is one of the most abundant prostaglandins in the brain, function of PGF in the central nervous system (CNS) has not been extensively investigated. Recently identified prostamide/PGF synthase catalyzes the reductions of prostamide H2 to prostamide F and PGH2 to PGF, chiefly in the CNS. We examined tissue distribution of the enzyme in the CNS by immunohistochemistry, double immunofluorescence, and immuno-electron microscopy. We confirmed histological findings by immunofluorescence analyses of brain cell cultures. Prostamide/PGF synthase was expressed preferentially in the white matter bundles of the entire CNS of adult mice with less marked expression in neuronal cell bodies. The enzyme was colocalized with myelin basic protein (MBP) in myelin sheaths but not in axons. At the ultrastructural level, the enzyme was localized to myelin sheaths. Expression of the enzyme increased between P9 and P14 during the postnatal development, presumably in accordance with myelinogenesis. Cultured oligodendrocytes at 7 days in vitro expressed the enzyme in cytoplasmic processes where the enzyme was colocalized with MBP. Immunoreactivity for COX-2 was detected in white matter and cultured oligodendrocytes. Relatively selective localization of prostamide/PGF synthase suggests that myelin sheaths of the CNS may serve as the sites for producing prostamide F and/or PGF, which may contribute to the formation and maintenance of central myelin.

Original languageEnglish (US)
Pages (from-to)22-32
Number of pages11
JournalBrain research
Volume1367
DOIs
Publication statusPublished - Jan 7 2011

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All Science Journal Classification (ASJC) codes

  • Neuroscience(all)
  • Molecular Biology
  • Clinical Neurology
  • Developmental Biology

Cite this

Yoshikawa, K., Takei, S., Hasegawa-Ishii, S., Chiba, Y., Furukawa, A., Kawamura, N., ... Shimada, A. (2011). Preferential localization of prostamide/prostaglandin F synthase in myelin sheaths of the central nervous system. Brain research, 1367, 22-32. https://doi.org/10.1016/j.brainres.2010.10.019