title: Evaluation of bone marrow mesenchymal stem cell standard cryopreservation procedure efficiency.
abstract: BACKGROUND
  Mesenchymal stem cells are obtained from a variety of sources, particularly bone marrow. These cells have great potential for clinical research due to their potential to regenerate tissue. As is well known, the cryopreservation process can store any cell type, particularly blood cells, for an indeterminate time.
  
  
  OBJECTIVE
  The aim of this study was to analyze the efficiency of standard cryopreservation procedures for adult mesenchymal stem cells from bone marrow.
  
  
  METHODS
  Mononuclear stem cells isolated from 10 Wistar male rats were cultivated for 4 weeks to obtain mesenchymal stem cells. The parameters considered in this study were trypan blue exclusion test and annexin V conjugated with 7-amino-actinomycin for flow cytometry before cryopreservation in liquid nitrogen vapor phase for 1 month and after thawing.
  
  
  RESULTS
  The viabilities determined by the trypan blue exclusion test were 94.76% and 90.58%, and the flow cytometry assay (annexin V conjugated with 7-amino-actinomycin) were 85.52% and 66.25%, before cryopreservation and after thawing, respectively.
  
  
  CONCLUSIONS
  Standard procedures for cryopreservation were not efficient for those cells. The flow cytometry assay was more sensitive than the trypan blue exclusion test to demonstrate nonviability.
authors.affiliation: Cellular Culture Experimental Laboratory, PUCPR, Brazil. katherinecarv@gmail.com
authors.forename: K A T
authors.initials: KA
authors.lastname: Carvalho
authors.forename: C C
authors.initials: CC
authors.lastname: Cury
authors.forename: L
authors.initials: L
authors.lastname: Oliveira
authors.forename: R I I
authors.initials: RI
authors.lastname: Cattaned
authors.forename: M
authors.initials: M
authors.lastname: Malvezzi
authors.forename: J C
authors.initials: JC
authors.lastname: Francisco
authors.forename: A
authors.initials: A
authors.lastname: Pachalok
authors.forename: M
authors.initials: M
authors.lastname: Olandoski
authors.forename: J R
authors.initials: JR
authors.lastname: Faria-Neto
authors.forename: L C
authors.initials: LC
authors.lastname: Guarita-Souza
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells / Q000166:cytology*; D002448:Cell Adhesion; D018929:Cell Culture Techniques; D002454:Cell Differentiation / Q000502:physiology; D002469:Cell Separation / Q000379:methods; D002470:Cell Survival; D015925:Cryopreservation / Q000379:methods*; D008297:Male; D059630:Mesenchymal Stem Cells / Q000166:cytology*; D051381:Rats; D017208:Rats, Wistar