Differential response of macrophage subpopulations to myelin degradation in the injured rat sciatic nerve

K. Hirata, H. Mitoma, N. Ueno, J. W. He, M. Kawabuchi

研究成果: ジャーナルへの寄稿記事

62 引用 (Scopus)

抄録

Molecular mechanisms of myelin removal by macrophages were explored by examining the immunophenotypes of macrophages following injury of rat sciatic nerve, using a combined method of immunohistochemistry and confocal laser microscopy. In the crush injury model, the involvement in myelin clearance of a cytoplasmic antigen specific for monocytes/macrophages, ED1, was evident. The obvious recruitment of ED1-immunoreactive (-ir) cells was detected first at the crush injury site and then in the distal stump within which Wallerian degeneration had occurred. Double labelling revealed that the ED1-ir cells, except for monocyte-like round cells, always phagocytosed myelin basic protein-ir myelin debris. On the other hand, the expression of ED2, a surface antigen specific for resident macrophages, was significantly different; ED2-ir cells also increased while myelin removal was progressing from day 3 to day 7, but only some of the cells were engaged in myelin phagocytosis. The poor capacity of myelin phagocytosis by ED2-ir cells was supported by the transection model, in which the proximal stump was ligated to suppress regeneration. ED2 may be involved in events other than myelin removal, providing a local environment conducive to axonal regeneration. Our findings thus seem to suggest that ED1 is one of the most reliable markers for cells carrying out myelin phagocytosis, whereas ED2 may participate in entirely different functions. The expression of complement receptor type 3, OX42, was similar to that of ED1 in terms of the swift recruitment of immunopositive cells, their distribution with close association to myelin debris and their high phagocytotic capacity. This supports previously reported in vitro evidence that myelin phagocytosis by macrophages may be complement-mediated.

元の言語英語
ページ(範囲)685-695
ページ数11
ジャーナルJournal of Neurocytology
28
発行部数8
DOI
出版物ステータス出版済み - 12 1 1999

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Sciatic Nerve
Myelin Sheath
Macrophages
Phagocytosis
Confocal Microscopy
Regeneration
Monocytes
Macrophage-1 Antigen
Wallerian Degeneration
Cytophagocytosis
Myelin Basic Protein
Surface Antigens
Immunohistochemistry
Antigens
Wounds and Injuries

All Science Journal Classification (ASJC) codes

  • Anatomy
  • Neuroscience(all)
  • Histology
  • Cell Biology

これを引用

Differential response of macrophage subpopulations to myelin degradation in the injured rat sciatic nerve. / Hirata, K.; Mitoma, H.; Ueno, N.; He, J. W.; Kawabuchi, M.

:: Journal of Neurocytology, 巻 28, 番号 8, 01.12.1999, p. 685-695.

研究成果: ジャーナルへの寄稿記事

Hirata, K. ; Mitoma, H. ; Ueno, N. ; He, J. W. ; Kawabuchi, M. / Differential response of macrophage subpopulations to myelin degradation in the injured rat sciatic nerve. :: Journal of Neurocytology. 1999 ; 巻 28, 番号 8. pp. 685-695.
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