- Human B cells purified from PBMCs of healthy blood donors sourced from a world-renowned blood center
- Greater than 90% post-selection purity achieved via negative isolation using magnetic columns
- Carefully cryopreserved to ensure high viability upon thawing
- All orders come with an iQ Certificate of Analysis
Purified Human B Cells
Human B Cells
Different subsets of human B cells are found in the blood with each population classified according to their maturation stage. In a typical adult, approximately 2% of circulating B cells are of the immature type, still undergoing development to become a naïve B cell capable of recognizing antigen. Once B cells finish development, they become naïve B cells, which account for 60-70% of the B cells found in the blood. These cells simultaneously express IgM and IgD and have not undergone somatic hypermutation. Some naïve B cells that have experienced antigen become memory B cells, which comprise 20-30% of total circulating B cells. These cells have undergone somatic hypermutation, display mutations in their Ig variable regions, and may have also undergone Ig class switching. The last subset of circulating B cells, which can be derived from naïve and memory cells, are plasmablasts. This cell population makes up approximately 2% of circulating B cells and function to produce antibodies. Each of these four subsets can be distinguished by their cell surface markers.
B Cell Application Summary
Purified human B cells are a good source of cells to study the biology of B cells and their role in the immune system. B cells are responsible for presenting antigen to T cells, producing certain cytokines, and most importantly, producing antibodies. Thus, B cells can be used for a variety of functional assays, including ELISAs for production of cytokines and antibodies, proliferation assays, and plaque-forming cell assays.
The negative isolation of B cells leaves them untouched without any antibody binding to cell surface markers. This leaves all cell surface proteins eligible to be bound to antibodies or other molecules for functional or population characterization studies.
B Cell Enrichment
Collection of samples
Leukapheresis was performed on verified healthy donors at a world-renowned blood center to obtain PBMCs. PBMCs were carefully washed to remove excess buffers according to iQ Biosciences’ standard operating procedures to obtain clean and healthy PBMCs.
Negative Isolation of Human B cells
To enrich for B cells, PBMCs were incubated with antibodies against T cells, NK cells, dendritic cells, monocytes, granulocytes, and erythrocytes, and subsequently run through a magnetic column. Cells labeled with the antibodies were bound to the column, while unlabeled cells, the B cells, passed through.
A small aliquot of cells was tested for post-sort purity by flow cytometry analysis. Purity of B cells, as defined by CD19 expression, was > 90% (Figure 1).
Figure 1. Purity of B cells after selection by negative isolation using magnetic column separation from PBMCs. In this representation, human PBMCs were incubated with antibodies against T cells, NK cells, dendritic cells, monocytes, granulocytes, and erythrocytes and passed through a magnetic column to obtain untouched B cells by negative selection. A small aliquot was taken after selection to evaluate post-sort purity (right). Percent of CD19+ cells in PBMCs is also shown (left).
Cryopreservation and storage
Purified B cells were cryopreserved carefully using iQ Biosciences’ cryopreservation protocol that ensures high viability after thawing.
Cells should be stored at <-120°C once they are received, such as within a liquid nitrogen tank (vapor phase).
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