Evaluation of unrestricted somatic stem cells as a feeder layer to support undifferentiated embryonic stem cells.
The use of unrestricted somatic stem cells (USSCs) holds great promise for future clinical applications. Conventionally, mouse embryonic fibroblasts (MEFs) or other animal-based feeder layers are used to support embryonic stem cell (ESC) growth; the use of such feeder cells increases the risk of retroviral and other pathogenic infection in clinical trials. Implementation of a human-based feeder layer, such as hUSSCs that are isolated from human sources, lowers such risks. Isolated cord blood USSCs derived from various donors were used as a novel, supportive feeder layer for growth of C4mES cells (Royan C4 ESCs). Complete cellular characterization using immunocytochemical and flow cytometric methods were performed on murine ESCs (mESCs) and hUSSCs. mESCs cultured on hUSSCs showed similar cellular morphology and presented the same cell markers of undifferentiated mESC as would have been observed in mESCs grown on MEFs. Our data revealed these cells had negative expression of Stat3, Sox2, and Fgf4 genes while showing positive expression for Pou5f1, Nanog, Rex1, Brachyury, Lif, Lifr, Tert, B2m, and Bmp4 genes. Moreover, mESCs cultured on hUSSCs exhibited proven differentiation potential to germ cell layers showing normal karyotype. The major advantage of hUSSCs is their ability to be continuously cultured for at least 50 passages. We have also found that hUSSCs have the potential to provide ESC support from the early moments of isolation. Further study of hUSSC as a novel human feeder layer may lead to their incorporation into clinical methods, making them a vital part of the application of human ESCs in clinical cell therapy.
Proteomics Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran. saeed_heidaril@spu.ir
Saeed Heidari
SH
Keshel
Masoud
M
Soleimani
Mostafa Rezaei
MR
Tavirani
Maryam
M
Ebrahimi
Reza
R
Raeisossadati
Hemad
H
Yasaei
Danial
D
Afsharzadeh
Mahmoud Jabbarvand
MJ
Behroz
Amir
A
Atashi
Saeid
S
Amanpour
Ahad
A
Khoshzaban
Reza
R
Roozafzoon
Gholam Reza
GR
Behrouzi
D000818:Animals; D015415:Biomarkers / Q000378:metabolism; D002454:Cell Differentiation / Q000502:physiology; D018920:Coculture Techniques / Q000379:methods*; D058732:Embryoid Bodies / Q000166:cytology; D053595:Embryonic Stem Cells / Q000166:cytology / Q000502:physiology*; D061252:Feeder Cells / Q000166:cytology / Q000502:physiology*; D005312:Fetal Blood / Q000166:cytology; D005434:Flow Cytometry; D005819:Genetic Markers / Q000235:genetics; D006801:Humans; D016130:Immunophenotyping; D059785:Karyotype; D051379:Mice; D016513:Mice, SCID; D013724:Teratoma / Q000737:chemistry
D015415:Biomarkers; D005819:Genetic Markers