Human umbilical cord blood hematopoietic stem/progenitor cells can grow up in the mouse liver / 中国实验血液学杂志

The biological characterization, differentiation and regeneration of hepatic stem/progenitor cells are the one of very active and interested fields. In this report, intravenous injection of human umbilical cord blood (HUCB) cells into the BALB/c-nu and SCID mice, an animal model for transplantation and liver injury, was reported. Using of flow cytometry and tissue typing (HLA), it was found that the HUCB cells were survived in mouse liver for 9 weeks. After separation from perfused liver, HUCB cells were detected by hematopoietic colonies (CFU-GEM M) in hepatocyte culture. It was concluded that the transplanted HUCB hematopoietic stem/progenitor cells can be survived in the liver over a long period of time.

Statistical analysis of 4000 umbilical cord blood units preserved in shandong cord blood bank / 中国实验血液学杂志

The current study analyzed the data of 4 000 umbilical cord blood (UCB) units collected in Shandong Cord Blood Bank from the end of 1999 to March 2001. The averages of nucleated cells and CD34(+) cells were more than 1.2 x 10(9) and 3.9 x 10(6) per UCB unit respectively, and more than 1.5 x 10(9) nucleated cells per UCB unit were obtained in 768 UCB units. These UCB units are suitable for transplantation in patients with a body weight greater than 40 kg. The analysis of HLA gene frequency showed that A2, A24, A11, B13, B51, DR15, DR7 and DR9 are the common halotypes in Shandong population and similar to those in the other areas of China. 40% patients could search out at least 1 UCB unit with 1 mismatched HLA locus in Shandong Cord Blood Bank.

Operating Procedure of Collection, Processing and Preservation of 3000 Units Umbilical Cord Blood in Shangdong Cord Blood Bank / 中国实验血液学杂志

The experience with the umbilical cord blood (UCB) stem cells for unrelated transplantation from our 3 000 UCB storage was described. UCB, collected from closed blood bags, were mixed with hydroxyethyl starch for nucleated cell (NC) enrichment. After finishing CD34 analysis, culture of hematopoietic progenitors (CFU-GM and CFU-GEMM) assays, microbial culture, HLA Class I (A, B) serology and class II (DR) low resolution SSP typing, cord blood units are stored in the liquid nitrogen for clinical applicatoin. Cord blood contained an average of nuclear cell (NC) (1.2 +/- 0.6) x 10(9), CD34(+) cells (3.0 +/- 3.7) x 10(6), CFU-GM (1.1 +/- 0.7) x 10(6) and CFU-GEMM (1.1 +/- 1.2) x 10(6) for storage and the recovery rates were 91%, 88%, 85% and 82%, respectively. The recovery rates for red blood cell and Hb were (39 +/- 9)% and (40 +/- 8)%, respectively. The storage volume was (35.1 +/- 7.1) ml in a 50 ml storage bags. The mean time from collection to processing of 15 hours (range 4 - 24 hours) had no influence on cell viability. The cell viability before processing is more than 95% and 92% after UCB thawing. The recovery rates of NC, CD34(+) cells and CFU-GM post-thawing were 96%, 90% and 91%, respectively. There were no HIV antibody (HIVAb) positive in all of UCB units. For an incidence of processed samples, infection with syphilis, HBsAg, HBcAb, HCVAb, CMV, bacterial contamination and abnormal hemoglobin were 0.1%, 0.8%, 3.2%, 0.2%, 87.1%, 1.2% and 0.1%, respectively. More than 3 HLA loci matched can be found for random patients in our cord blood bank and 6 HLA loci matched have 5%. For transplantation with nucleated cell counts of > 2.7 x 10(7) cells/kg, our cord blood bank will be able to provide all of the umbilical cord blood stem cell samples for children and 50% of units can be used for some of adult recipients transplantation in the country. It is concluded that: (1) The large cord blood banking for 20 000 UCB storage is feasible in China. (2) Our system of whole procedure and methods is functionable for supplying qualified cord blood units in transplantation. (3) The volume for collection is critical to the yield of CD34(+) cells or hematopoietic progenitor cells, however cord blood NC is also important and proportional with CD34(+) cells. Only the units containing more than 8 x 10(8) cells and more than 60 ml of cord blood can be in the procession for storage.

Quality Control in Umbilical Cord Blood Bank / 中国实验血液学杂志

Recent clinical reports have demonstrated that the use of umbilical cord blood (UCB) opened a new source of stem cell for hematopoietic stem cell transplantation, leading to the development of cord blood banks world-wide. Prior to the large scale construction of UCB banks, quality control must be performed for health care providers and manufactures. With increasingly stringent regulatory requirement in blood industry, quality control is playing an important role in the operation of blood centers and stem cell laboratories. Reviewed the lectures in the biology of UCB and UCB banks published in recent years, our experiences were discussed in setting up Shandong blood bank to define process variables associated with the collection of UCB, to determine and optimize the procedures and materials used, to ascertain how UCB can be processed in clean room as mononucleated cell preparations, and to analyze using of long-term storage of UCB in research and clinic in the future. Our conclusions are: (1) the establishment of UCB banks for use in transplantation appears to be easy, effective and particularly suitable approach in China under cGMP conditions; (2) the procedures for volume reduction by closed and semi-automated blood processing system, SSP HLA typing, biocode and local computer net, microbiological tests and the 50 ml cryobags for storage constitute a cost efficient system for large-scale UCB banking; (3) the average of 60 ml UCB collection may contain sufficent marrow repopulating cells for children and most of adult recipients; and (4) hematopoietic stem and progenitor cells in cord blood have a more potent proliferative ability than those derived from bone marrow in cell expansion potentials.