Fluorescence tagging and inducible depletion of PD-L2-expressing B-1 B cells in vivo.
L2pB1 cells are a subpopulation of B-1a B cells that express programmed death ligand 2 (PD-L2) as their unique cell surface marker. In mice, about 50% of peritoneal B-1a cells are L2pB1 cells. The remaining B-1a cells are L2nB1 (PD-L2(-) ) B-1a cells. L2pB1 cells differ from L2nB1 cells in their immunoglobulin repertoire, expression of interleukin 10, and their capacity to phagocytose phosphatidylcholine. The physiological roles of L2pB1 cells have not been investigated owing to the lack of an animal model that allows for specific depletion of L2pB1 cells. Here, we report a mouse model that enables specific tracking and inducible depletion of L2pB1 cells in vivo. Our data show that depletion of L2pB1 cells significantly reduces serum anti-phosphorylcholine (PC) IgM levels and IL-10 expression in the peritoneal cavity. This animal model provides a tool for the study of the immune regulatory functions of L2pB1 cells in health and disease.
Hematology Oncology Section, Department of Medicine, Boston University School of Medicine, Boston, Massachusetts.
Rebecca A
RA
Lee
Hematology Oncology Section, Department of Medicine, Boston University School of Medicine, Boston, Massachusetts.
Changchuin
C
Mao
Hematology Oncology Section, Department of Medicine, Boston University School of Medicine, Boston, Massachusetts.
Hung
H
Vo
Antagen Institute for Biomedical Research, Boston, Massachusetts.
Wenda
W
Gao
Hematology Oncology Section, Department of Medicine, Boston University School of Medicine, Boston, Massachusetts.
Xuemei
X
Zhong
D000818:Animals; D016175:B-Lymphocyte Subsets / Q000378:metabolism*; D002452:Cell Count / Q000379:methods; D005786:Gene Expression Regulation; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D061848:Optical Imaging / Q000379:methods*; D061027:Programmed Cell Death 1 Ligand 2 Protein / Q000096:biosynthesis* / Q000235:genetics
C556978:Pdcd1lg2 protein, mouse; D061027:Programmed Cell Death 1 Ligand 2 Protein
L2pB1 cells; TdTomato; ZsGreen; diphtheria toxin receptor; monoallelic expression