Bioreactor for blood product production.

The feasibility of ex vivo blood production is limited by both biological and engineering challenges. From an engineering perspective, these challenges include the significant volumes required to generate even a single unit of a blood product, as well as the correspondingly high protein consumption required for such large volume cultures. Membrane bioreactors, such as hollow fiber bioreactors (HFBRs), enable cell densities approximately 100-fold greater than traditional culture systems and therefore may enable a significant reduction in culture working volumes.

Surface-bound stem cell factor and the promotion of hematopoietic cell expansion.

In vivo, stem cell factor (SCF) exists in both a bound and soluble isoform. It is believed that the bound form is more potent and fundamentally required for the maintenance of hematopoietic stem cells (HSCs). This theory is supported by the observation that steel-Dickie mice lacking the bound isoform of SCF are unable to maintain hematopoiesis and by the fact that bound SCF displayed on the surface of transgenic cells is better able to maintain c-kit activation than soluble SCF.

Monozygotic triplet pregnancy following egg donation and transfer of single frozen-thawed embryo.

Objective: To describe a case of monozygotic triplet pregnancy following egg donation and the transfer of a single frozen-thawed embryo.

Design: Case report.

Setting: District general hospital and regional department of fetal medicine in northeast England.