TY - JOUR
T1 - Primitive Embryonic Macrophages are Required for Coronary Development and Maturation
AU - Leid, Jamison
AU - Carrelha, Joana
AU - Boukarabila, Hanane
AU - Epelman, Slava
AU - Jacobsen, Sten E.W.
AU - Lavine, Kory J.
N1 - Publisher Copyright:
© 2016 American Heart Association, Inc.
PY - 2016/5/13
Y1 - 2016/5/13
N2 - Rationale: It is now recognized that macrophages residing within developing and adult tissues are derived from diverse progenitors including those of embryonic origin. Although the functions of macrophages in adult organisms are well studied, the functions of macrophages during organ development remain largely undefined. Moreover, it is unclear whether distinct macrophage lineages have differing functions. Objective: To address these issues, we investigated the functions of macrophage subsets resident within the developing heart, an organ replete with embryonic-derived macrophages. Methods and Results: Using a combination of flow cytometry, immunostaining, and genetic lineage tracing, we demonstrate that the developing heart contains a complex array of embryonic macrophage subsets that can be divided into chemokine (C-C motif) receptor 2 - and chemokine (C-C motif) receptor 2 + macrophages derived from primitive yolk sac, recombination activating gene 1 + lymphomyeloid, and Fms-like tyrosine kinase 3 + fetal monocyte lineages. Functionally, yolk sac-derived chemokine (C-C motif) receptor 2 - macrophages are instrumental in coronary development where they are required for remodeling of the primitive coronary plexus. Mechanistically, chemokine (C-C motif) receptor 2 - macrophages are recruited to coronary blood vessels at the onset of coronary perfusion where they mediate coronary plexus remodeling through selective expansion of perfused vasculature. We further demonstrate that insulin like growth factor signaling may mediate the proangiogenic properties of embryonic-derived macrophages. Conclusions: Together, these findings demonstrate that the embryonic heart contains distinct lineages of embryonic macrophages with unique functions and reveal a novel mechanism that governs coronary development.
AB - Rationale: It is now recognized that macrophages residing within developing and adult tissues are derived from diverse progenitors including those of embryonic origin. Although the functions of macrophages in adult organisms are well studied, the functions of macrophages during organ development remain largely undefined. Moreover, it is unclear whether distinct macrophage lineages have differing functions. Objective: To address these issues, we investigated the functions of macrophage subsets resident within the developing heart, an organ replete with embryonic-derived macrophages. Methods and Results: Using a combination of flow cytometry, immunostaining, and genetic lineage tracing, we demonstrate that the developing heart contains a complex array of embryonic macrophage subsets that can be divided into chemokine (C-C motif) receptor 2 - and chemokine (C-C motif) receptor 2 + macrophages derived from primitive yolk sac, recombination activating gene 1 + lymphomyeloid, and Fms-like tyrosine kinase 3 + fetal monocyte lineages. Functionally, yolk sac-derived chemokine (C-C motif) receptor 2 - macrophages are instrumental in coronary development where they are required for remodeling of the primitive coronary plexus. Mechanistically, chemokine (C-C motif) receptor 2 - macrophages are recruited to coronary blood vessels at the onset of coronary perfusion where they mediate coronary plexus remodeling through selective expansion of perfused vasculature. We further demonstrate that insulin like growth factor signaling may mediate the proangiogenic properties of embryonic-derived macrophages. Conclusions: Together, these findings demonstrate that the embryonic heart contains distinct lineages of embryonic macrophages with unique functions and reveal a novel mechanism that governs coronary development.
KW - flow cytometry
KW - fms-like tyrosine kinase 3
KW - macrophages
KW - monocytes
KW - yolk sac
UR - http://www.scopus.com/inward/record.url?scp=84961664602&partnerID=8YFLogxK
U2 - 10.1161/CIRCRESAHA.115.308270
DO - 10.1161/CIRCRESAHA.115.308270
M3 - Article
C2 - 27009605
AN - SCOPUS:84961664602
SN - 0009-7330
VL - 118
SP - 1498
EP - 1511
JO - Circulation research
JF - Circulation research
IS - 10
ER -