title: Yolk sac-derived murine macrophage cell line has a counterpart during ES cell differentiation.
abstract: Macrophages are phagocytic hematopoietic cells involved in several immune processes, but they are also present early in mammalian development and may participate in embryonic tissue remodeling. We have isolated and characterized a cell line, Py-YSA, from the mouse yolk sac. Py-YSA cells have several functional properties of macrophages, including uptake of acetylated low density lipoprotein and phagocytic capability. They express the murine macrophage markers F4/80 and Mac-1, and they express RNA for the c-fms receptor. Their expansion in culture requires fibroblast conditioned medium or exogenous monocyte-colony stimulating factor. Murine ES (embryonic stem) cell cultures that undergo in vitro differentiation recapitulate yolk sac development, and during this process cells arise that express both Mac-1 and F4/80 and morphologically resemble the Py-YSA cells. The kinetics and distribution pattern of the Mac-1+ cells during a time course of ES cell differentiation suggest that they originate in the blood islands, and that they subsequently leave the blood islands and disperse to tissue sites. Both F4/80 and Mac-1 are first expressed in primary cultures from day 9.5 yolk sacs. The Py-YSA cultured cells thus resemble embryonic tissue macrophages by several criteria, and they share a marker profile with a cell type found in yolk sacs and differentiating ES cells. Py-YSA cells will be a useful reagent for further understanding the role of embryonic tissue macrophages in development.
authors.affiliation: Department of Biology, University of North Carolina at Chapel Hill, 27599, USA.
authors.forename: M
authors.initials: M
authors.lastname: Inamdar
authors.forename: T
authors.initials: T
authors.lastname: Koch
authors.forename: R
authors.initials: R
authors.lastname: Rapoport
authors.forename: J T
authors.initials: JT
authors.lastname: Dixon
authors.forename: J A
authors.initials: JA
authors.lastname: Probolus
authors.forename: E
authors.initials: E
authors.lastname: Cram
authors.forename: V L
authors.initials: VL
authors.lastname: Bautch
mesh_terms: D016475:3T3 Cells; D000818:Animals; D015415:Biomarkers; D002454:Cell Differentiation; D002460:Cell Line; D002478:Cells, Cultured; D005260:Female; D008264:Macrophages / Q000166:cytology* / Q000378:metabolism; D008297:Male; D008565:Membrane Proteins; D051379:Mice; D008822:Mice, Transgenic; D010586:Phagocytes; D012313:RNA; D011971:Receptors, Immunologic / Q000378:metabolism; D018110:Receptors, Lipoprotein; D051116:Receptors, Scavenger; D051122:Scavenger Receptors, Class B; D013234:Stem Cells / Q000166:cytology* / Q000378:metabolism; D015017:Yolk Sac / Q000166:cytology* / Q000378:metabolism
chemical_list: D015415:Biomarkers; D008565:Membrane Proteins; D011971:Receptors, Immunologic; D018110:Receptors, Lipoprotein; D051116:Receptors, Scavenger; C454739:Scarb1 protein, mouse; D051122:Scavenger Receptors, Class B; D012313:RNA