Article

Journal of Molecular Histology

, Volume 36, Issue 6, pp 391-400

Localization of epidermal-type fatty acid binding protein in macrophages in advanced atretic follicles of adult mice

  • Mohammad Reza NouraniAffiliated withDivision of Histology, Department of Cell Biology, Graduate School of Medicine, Tohoku University
  • , Yuji OwadaAffiliated withDivision of Histology, Department of Cell Biology, Graduate School of Medicine, Tohoku University Email author 
  • , Noriko KitanakaAffiliated withDivision of Histology, Department of Cell Biology, Graduate School of Medicine, Tohoku University
  • , Soha Abdelkawi AbdelwahabAffiliated withDivision of Histology, Department of Cell Biology, Graduate School of Medicine, Tohoku University
  • , Hiroo IwasaAffiliated withDivision of Histology, Department of Cell Biology, Graduate School of Medicine, Tohoku University
  • , Hiroyuki SakagamiAffiliated withDivision of Histology, Department of Cell Biology, Graduate School of Medicine, Tohoku University
  • , Friedrich SpenerAffiliated withDepartment of Biochemistry, University of Muenster
  • , Hisatake KondoAffiliated withDivision of Histology, Department of Cell Biology, Graduate School of Medicine, Tohoku University

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Summary

The localization of epidermal-type fatty acid binding protein (E-FABP) in the mature mouse ovary was examined by immuno-light and electron microscopy. Numerous macrophages immunopositive for both anti-E-FABP and F4/80 antibodies, together with immunonegative cells, were found in advanced atretic follicles that had eccentric lumens containing deformed ova. While some E-FABP-immunopositive macrophages were spider in shape and appeared singly, others, especially close to the lumen, were round and voluminous and tended to be aggregated. The voluminous macrophages contained phagosomes of various sizes and they were regarded as those actively involved in the phagocytosis of apoptotic granulosa cells. E-FABP-immunopositive macrophages and their processes were often apposed to adjacent immunonegative cells, and some of them lined the lumen containing deformed ova. On the other hand, E-FABP-immunonegative cells in the atretic follicles were classified into two types: the one, a minority, was characterized by small mitochondria containing non-tubular cristae and presumably represented residual granulosa cells, while the other dominant type was characterized by large mitochondria containing tubular cristae and presumably represented theca cells originally surrounding the follicles to be atretic. The present detection of E-FABP-immunopositivity selectively in macrophages of the atretic follicles suggests possible involvement of E-FABP and/or its ligand fatty acids in the process of follicular atresia, and it makes more reliable the identification of the advanced atretic follicles with the antral spaces obliterated, which could provide further details on the histology of the follicular atresia than before.

Key words:

fatty acid binding protein macrophage atresia ovary apoptosis