Isolation of macrophages (Hofbauer cells) from human term placenta and their prostaglandin E2 and thromboxane production

Human Reproduction
B WetzkaS K Smith

Abstract

Placental macrophages (Hofbauer cells) are located close to trophoblast cells and fetal capillaries, which makes them ideal candidates for involvement in regulatory processes within the villous core. Their production of various cytokines and prostaglandin (PG) synthesizing enzymes has previously been shown immunohistochemically. Hofbauer cells were isolated from human placenta after term deliveries by Ficoll and Percoll gradient centrifugation. Remaining trophoblast cells were removed with anti-epidermal growth factor (EGF)-receptor-coated Dynabeads followed by differential adherence. The identity of isolated cells was investigated by immunohistochemistry with anti-CD68, which showed that >90% cells were positive. After a 36 h recovery period in either 20% O2 or 5% O2, fresh medium was applied and PGE2 and thromboxane (TXA2) production analysed by enzyme immunoassay at 4, 8, and 24 h. PGE2 and TXA2 were both produced by placental macrophages with PGE2 synthesis being predominant. Concentrations of both could be stimulated by lipopolysaccharide with maximum effect after 24 h. Culture in low oxygen caused decreased PGE2 concentrations, whereas TXA2 production remained unchanged. In conclusion, the presented isolation protocol all...Continue Reading

Citations

Oct 7, 2000·Bulletin of Experimental Biology and Medicine·S A Sel'kovA V Selyutin
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Oct 16, 2008·American Journal of Reproductive Immunology : AJRI·Oleg PavlovSergei Selkov
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Mar 16, 2011·Annals of the New York Academy of Sciences·Zhonghua TangSeth Guller
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Feb 20, 2009·The Journal of Nutrition·Phil Cunningham, Lindsay McDermott
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Oct 6, 2020·Frontiers in Immunology·Regina HooRoser Vento-Tormo
Apr 11, 2019·Journal of Innate Immunity·Michael Z ZuluClive M Gray

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