PMID- 24879443 OWN - NLM STAT- MEDLINE DCOM- 20150512 LR - 20211021 IS - 1567-2387 (Electronic) IS - 1567-2379 (Linking) VI - 45 IP - 5 DP - 2014 Oct TI - Expression of epidermal fatty acid binding protein (E-FABP) in septoclasts in the growth plate cartilage of mice. PG - 507-18 LID - 10.1007/s10735-014-9576-1 [doi] AB - n-3 Polyunsaturated fatty acids play a role in regulating the growth of the long bones. Fatty acid-binding proteins (FABPs) bind and transport hydrophobic long-chain fatty acids intracellularly, and epidermal-type FABP (E-FABP) has an affinity for n-3 fatty acids. This study aimed to clarify the localization of E-FABP in the growth plate of the mouse tibia. At the chondro-osseous junction (COJ) of the growth plate, E-FABP-immunoreactivity was exclusively localized in mononuclear, spindle-shaped cells with several long processes. These E-FABP-immunoreactive cells were identified as being septoclasts, i.e., cells that resorb uncalcified transverse septa. The processes of these immunoreactive septoclasts terminated between the longitudinal and transverse septa. E-FABP-immunoreactivity was found in the entire cytoplasm and on the mitochondrial outer membrane. In ontogeny, immunoreactive septoclasts were observed immediately after emergence of the primary ossifying center and were distributed not only at the COJ but also in the metaphysis near the COJ. The number of septoclasts increased at the postnatal age of 1 week (P1w)-P2w, and thereafter gradually decreased; and the cells became concentrated at the COJ after P3w-P4w. The immunoreactivity for peroxisome proliferator-activated receptor (PPAR)beta/delta was detected in these E-FABP-immunoreactive septoclasts. The present results suggest that fatty acids, preferably n-3 ones, are intracellularly transported by E-FABP to various targets, including mitochondria and nucleus, in which PPARbeta/delta may play functional roles in the transcriptional regulation of genes involved in the endochondral ossification. FAU - Bando, Yasuhiko AU - Bando Y AD - Division of Anatomy, Meikai University School of Dentistry, 1-1 Keyakidai, Sakado, Saitama, 3500283, Japan, y-bando@dent.meikai.ac.jp. FAU - Yamamoto, Miyuki AU - Yamamoto M FAU - Sakiyama, Koji AU - Sakiyama K FAU - Inoue, Katsuyuki AU - Inoue K FAU - Takizawa, Shota AU - Takizawa S FAU - Owada, Yuji AU - Owada Y FAU - Iseki, Shoichi AU - Iseki S FAU - Kondo, Hisatake AU - Kondo H FAU - Amano, Osamu AU - Amano O LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20140531 PL - Netherlands TA - J Mol Histol JT - Journal of molecular histology JID - 101193653 RN - 0 (Fabp5 protein, mouse) RN - 0 (Fatty Acid-Binding Proteins) RN - 0 (Neoplasm Proteins) RN - 0 (PPAR delta) RN - 0 (PPAR gamma) SB - IM MH - Animals MH - Cytoplasm/metabolism MH - Fatty Acid-Binding Proteins/*genetics/metabolism MH - Female MH - *Gene Expression Regulation, Developmental MH - Growth Plate/cytology/growth & development/*metabolism MH - Immunohistochemistry MH - Male MH - Mice MH - Microscopy, Confocal MH - Microscopy, Immunoelectron MH - Mitochondrial Membranes/metabolism MH - Neoplasm Proteins/*genetics/metabolism MH - PPAR delta/metabolism MH - PPAR gamma/metabolism MH - Pregnancy MH - Reverse Transcriptase Polymerase Chain Reaction MH - Tibia/cytology/growth & development/*metabolism MH - Time Factors EDAT- 2014/06/01 06:00 MHDA- 2015/05/13 06:00 CRDT- 2014/06/01 06:00 PHST- 2014/05/08 00:00 [received] PHST- 2014/05/21 00:00 [accepted] PHST- 2014/06/01 06:00 [entrez] PHST- 2014/06/01 06:00 [pubmed] PHST- 2015/05/13 06:00 [medline] AID - 10.1007/s10735-014-9576-1 [doi] PST - ppublish SO - J Mol Histol. 2014 Oct;45(5):507-18. doi: 10.1007/s10735-014-9576-1. Epub 2014 May 31.