A novel source of viable peripheral blood mononuclear cells from leukoreduction system chambers.
BACKGROUND
Buffy coats are becoming less available as a source of research-grade peripheral blood mononuclear cells (PBMNCs). Therefore, alternative sources of these cells were investigated.


METHODS
PBMNCs isolated from the cells retained in leukoreduction system chambers (LRSCs) and those eluted from white blood cell filters were compared. From LRSCs (1.88 +/- 0.40) x 10(9) PBMNCs (n = 13) versus (0.43 +/- 0.15) x 10(9) PBMNCs were isolated from leukofilter eluates (LFEs, n = 8; p < 0.0001).


RESULTS
Cells from LRSCs and LFEs produced similar numbers of burst-forming unit-erythroid, colony-forming unit (CFU)-granulocyte-macrophage, and CFU-granulocyte-erythrocyte-monocyte-macrophage-megakaryocyte colonies. The percentages of cells positive for CD3, CD4, CD8, CD14, CD19, and CD56 in the PBMNCs isolated from LRSCs and LFEs were indistinguishable. Cells isolated from LRSCs expressed higher levels of CD69 and CD25 in reaction to staphylococcal enterotoxin B than the cells isolated from LFEs. The source of cells affected neither the yield and purity of immunomagnetically isolated CD3+ cells, CD14+ cells, and CD56+ cells nor the function of T cells, natural killer cells, and in vitro matured dendritic cells (DCs). DC yield from LRSC-derived CD14+ cells, however, was higher.


CONCLUSIONS
LRSCs are a novel source of fully functional PBMNCs that can replace the more traditional sources of research-grade cellular products.
Dietz
Allan B
AB
Division of Transfusion Medicine, Department of Laboratory Medicine and Pathology, Mayo Clinic College of Medicine, Rochester, Minnesota 55095, USA. dietz.allan@mayo.edu
Bulur
Peggy A
PA
Emery
Richard L
RL
Winters
Jeffrey L
JL
Epps
Dennis E
DE
Zubair
Abba C
AC
Vuk-Pavlović
Stanimir
S
D003713:Dendritic Cells / Q000166:cytology; D004768:Enterotoxins / Q000494:pharmacology; D006412:Hematopoietic Stem Cells / Q000166:cytology; D006801:Humans; D018189:Immunomagnetic Separation; D047589:Leukocyte Reduction Procedures / Q000379:methods*; D007963:Leukocytes, Mononuclear / Q000166:cytology*; D018950:Lipopolysaccharide Receptors / Q000032:analysis
D004768:Enterotoxins; D018950:Lipopolysaccharide Receptors; C031818:enterotoxin B, staphylococcal