| First Author | Beckers CML | Year | 2017 |
| Journal | Arterioscler Thromb Vasc Biol | Volume | 37 |
| Issue | 8 | Pages | 1494-1502 |
| PubMed ID | 28596376 | Mgi Jnum | J:264787 |
| Mgi Id | MGI:6193275 | Doi | 10.1161/ATVBAHA.117.309271 |
| Citation | Beckers CML, et al. (2017) Cre/lox Studies Identify Resident Macrophages as the Major Source of Circulating Coagulation Factor XIII-A. Arterioscler Thromb Vasc Biol 37(8):1494-1502 |
| abstractText | OBJECTIVE: To establish the cellular source of plasma factor (F)XIII-A. APPROACH AND RESULTS: A novel mouse floxed for the F13a1 gene, FXIII-A(flox/flox) (Flox), was crossed with myeloid- and platelet-cre-expressing mice, and cellular FXIII-A mRNA expression and plasma and platelet FXIII-A levels were measured. The platelet factor 4-cre.Flox cross abolished platelet FXIII-A and reduced plasma FXIII-A to 23+/-3% (P<0.001). However, the effect of platelet factor 4-cre on plasma FXIII-A was exerted outside of the megakaryocyte lineage because plasma FXIII-A was not reduced in the Mpl(-/-) mouse, despite marked thrombocytopenia. In support of this, platelet factor 4-cre depleted FXIII-A mRNA in brain, aorta, and heart of floxed mice, where FXIII-A(pos) cells were identified as macrophages as they costained with CD163. In the integrin alphaM-cre.Flox and the double copy lysozyme 2-cre.cre.Flox crosses, plasma FXIII-A was reduced to, respectively, 75+/-5% (P=0.003) and 30+/-7% (P<0.001), with no change in FXIII-A content per platelet, further consistent with a macrophage origin of plasma FXIII-A. The change in plasma FXIII-A levels across the various mouse genotypes mirrored the change in FXIII-A mRNA expression in aorta. Bone marrow transplantation of FXIII-A(+/+) bone marrow into FXIII-A(-/-) mice both restored plasma FXIII-A to normal levels and replaced aortic and cardiac FXIII-A mRNA, while its transplantation into FXIII-A(+/+) mice did not increase plasma FXIII-A levels, suggesting that a limited population of niches exists that support FXIII-A-releasing cells. CONCLUSIONS: This work suggests that resident macrophages maintain plasma FXIII-A and exclude the platelet lineage as a major contributor. |
