title: Preliminary findings on the use of pulsatile machine reperfusion of a placenta to improve the cord blood collection yield including primitive hematopoietic stem cell fractions.
abstract: BACKGROUND
  Umbilical cord blood (CB) use is limited in most adults since the mean amount of hematopoietic stem cells (HSCs) collected is generally insufficient to engraft successfully. This study demonstrates for the first time the feasibility of pulsatile machine placenta reperfusion (PMPR), which significantly improves CB collection quantity and quality compared to standard collection methods.
  
  
  METHODS
  PMPR was performed on eight delivered placentas up to 39 hours after venipuncture-based collection. PMPR was performed on average for 26 (20-30) minutes, 17 hours after delivery (6.25-39), using perfusate approved for donated organ reperfusion. Both PMPR and conventional collection-derived CB cells were analyzed using immunophenotyping and colony assays.
  
  
  RESULTS
  The combination of PMPR and the conventional venipuncture method yielded a mean of 1.5-, 4.9-, 11-, 7.5-, 7.5-, and 7.7-fold increased number of total mononuclear, CD34+, CD34+/CD38-, CD133+, CD133+/CD34+, and CD133+/CD34- cells, respectively, compared to conventional venipuncture alone. CB cells obtained by PMPR alone generally demonstrated a significant increase in percentages of primitive HSC phenotype with equivalent cell viability between PMPR and venipuncture.
  
  
  CONCLUSIONS
  This article demonstrates for the first time that CB can be collected up to 39 hours after delivery with PMPR while maximizing CB collection including HSCs with primitive phenotypes.
authors.affiliation: Greenebaum Cancer Center and Pharmacology and Experimental Therapeutics, University of Maryland School of Medicine, Baltimore, Maryland, USA. takeben@gmail.com
authors.forename: Naoko
authors.initials: N
authors.lastname: Takebe
authors.forename: Fred
authors.initials: F
authors.lastname: Gage
authors.forename: Xiangfei
authors.initials: X
authors.lastname: Cheng
authors.forename: Marietya I S
authors.initials: MI
authors.lastname: Lauw
mesh_terms: D000071916:AC133 Antigen; D051997:ADP-ribosyl Cyclase 1 / Q000378:metabolism; D000328:Adult; D015703:Antigens, CD / Q000378:metabolism; D018952:Antigens, CD34 / Q000378:metabolism; D001800:Blood Specimen Collection / Q000379:methods*; D005260:Female; D005312:Fetal Blood / Q000166:cytology*; D005434:Flow Cytometry; D006023:Glycoproteins / Q000378:metabolism; D006412:Hematopoietic Stem Cells / Q000166:cytology; D006801:Humans; D007963:Leukocytes, Mononuclear / Q000166:cytology / Q000378:metabolism; D010455:Peptides / Q000378:metabolism; D010920:Placenta / Q000098:blood supply / Q000166:cytology*; D011247:Pregnancy; D013997:Time Factors; D055815:Young Adult
chemical_list: D000071916:AC133 Antigen; D015703:Antigens, CD; D018952:Antigens, CD34; D006023:Glycoproteins; C000606023:PROM1 protein, human; D010455:Peptides; D051997:ADP-ribosyl Cyclase 1