PMID- 16911712 OWN - NLM STAT- MEDLINE DCOM- 20061017 LR - 20111117 IS - 1046-7408 (Print) IS - 1046-7408 (Linking) VI - 56 IP - 3 DP - 2006 Sep TI - Human leukocyte antigen F protein is expressed in the extra-villous trophoblasts but not on the cell surface of them. PG - 172-7 AB - PROBLEM: Human leukocyte antigen (HLA)-F together with other class 1b HLAs may play a pivotal role in immunological interaction at feto-maternal interface. However, it is not elucidated whether HLA-F is expressed on cell surface of extra-villous trophoblasts (EVTs). METHOD OF STUDY: The localization of HLA-F in placenta of each trimester was investigated by immunohistochemistry. The expression modality of HLA-F molecule was compared with that of HLA-G in cultured EVTs using flowcytometry. RESULTS AND CONCLUSION: In immunohistochemical study, remarkable staining for HLA-F was confirmed in EVTs throughout gestation. HLA-F expression was restricted to be intracellular in cultured EVTs. HLA-F expression was increased with time in culture, which was accompanied by the increase of cell surface HLA-G. Consequently, HLA-F lacking in cell surface expression on EVTs may not contribute to the direct cell-to-cell immune reaction but might work supportively modifying the function of HLA-G. FAU - Nagamatsu, Takeshi AU - Nagamatsu T AD - Department of Obstetrics and Gynecology, Faculty of Medicine, University of Tokyo, Tokyo, Japan. FAU - Fujii, Tomoyuki AU - Fujii T FAU - Matsumoto, Junko AU - Matsumoto J FAU - Yamashita, Takahiro AU - Yamashita T FAU - Kozuma, Shiro AU - Kozuma S FAU - Taketani, Yuji AU - Taketani Y LA - eng PT - Journal Article PL - Denmark TA - Am J Reprod Immunol JT - American journal of reproductive immunology (New York, N.Y. : 1989) JID - 8912860 RN - 0 (HLA Antigens) RN - 0 (HLA-F antigens) RN - 0 (HLA-G Antigens) RN - 0 (Histocompatibility Antigens Class I) SB - IM MH - Cell Culture Techniques MH - Cell Line, Tumor MH - Cell Membrane/immunology MH - Female MH - Flow Cytometry MH - HLA Antigens/*analysis/metabolism MH - HLA-G Antigens MH - Histocompatibility Antigens Class I/*analysis/metabolism MH - Humans MH - Pregnancy MH - Trophoblasts/cytology/*immunology/metabolism EDAT- 2006/08/17 09:00 MHDA- 2006/10/18 09:00 CRDT- 2006/08/17 09:00 PHST- 2006/08/17 09:00 [pubmed] PHST- 2006/10/18 09:00 [medline] PHST- 2006/08/17 09:00 [entrez] AID - AJI414 [pii] AID - 10.1111/j.1600-0897.2006.00414.x [doi] PST - ppublish SO - Am J Reprod Immunol. 2006 Sep;56(3):172-7. doi: 10.1111/j.1600-0897.2006.00414.x.