Localization of epidermal-type fatty acid binding protein in the thymic epithelial cells of mice.
The immunoreactivity for epidermal-type fatty acid binding protein of epidermis type (E-FABP) was selectively localized in the epithelial cells of both cortex and medulla of mouse thymus. The cortical epithelial cytoreticulum was clearly visible with the intense immunoreactivity and the immunoreactive cytoreticulum extended intricately throughout the thymic cortex to enclose thymocytes. In the thymic medulla, the immunoreactivity was variable in intensity among the epithelial cells and there was a tendency that epithelial cells containing more numerous tonofilament bundles were less immunoreactive. Considering the possibility that FABPs function as intracellular carriers for unsaturated long chain fatty acids, the present finding suggests that E-FABP in the thymic epithelial cells, especially the cortical ones because of their extensive location, are intimately involved in the metabolic processes of fatty acids including production of bioactive substances, such as prostaglandin and leukotriene, which are known to exert some regulation of thymic immune responses.
Owada
Yuji
Y
Division of Histology, Department of Cell Biology, Graduate School of Medical Sciences, Tohoku University, 2-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan.
Suzuki
Ryoji
R
Iwasa
Hiroo
H
Spener
Friedrich
F
Kondo
Hisatake
H
D000818:Animals; D015152:Blotting, Northern; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism*; D004817:Epidermis / Q000378:metabolism*; D004847:Epithelial Cells / Q000378:metabolism* / Q000648:ultrastructure; D000071438:Fatty Acid-Binding Protein 7; D050556:Fatty Acid-Binding Proteins; D007150:Immunohistochemistry; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D016253:Microscopy, Immunoelectron; D009363:Neoplasm Proteins; D009419:Nerve Tissue Proteins; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D013950:Thymus Gland / Q000166:cytology / Q000378:metabolism*
D002352:Carrier Proteins; C082667:Fabp5 protein, mouse; C086936:Fabp7 protein, mouse; D000071438:Fatty Acid-Binding Protein 7; D050556:Fatty Acid-Binding Proteins; D009363:Neoplasm Proteins; D009419:Nerve Tissue Proteins; D012333:RNA, Messenger