Abstract：
:We describe a two-step clonal culture assay system for human lymphohematopoietic progenitors present in umbilical cord blood which are capable of differentiation along both myeloid and B-lymphoid lineages. Human cord blood CD34+ cells were plated in methylcellulose in the presence of stem cell factor (SCF), granulocyte-colony stimulating factor (G-CSF), interleukin (IL)-7, and the murine stroma cell line, MS-5. The growing primary colonies were individually examined for their potentials to differentiate along both myeloid and B-lymphoid lineages by reculturing aliquots of the primary colonies in methylcellulose culture containing IL-3, G-CSF and erythropoietin (Epo), and on a monolayer of MS-5 in the presence of SCF and G-CSF. Approximately 10-15% of the primary colonies generated various combinations of myeloid cells and CD19+ sIgM+ cells. Subsequent studies using micromanipulated single CD34+ cells unequivocally demonstrated the clonal origin of the lymphohematopoietic progenitors. This culture system should prove valuable for elucidation of the mechanisms regulating early stages of human lymphohematopoiesis.
journal_name
Hum Immunoljournal_title
Human immunologyauthors
Yoshikawa Y,Ikebuchi K,Ohkawara J,Hirayama F,Yamaguchi M,Sato N,Mori KJ,Kasai M,Sekiguchi Sdoi
10.1016/s0198-8859(98)00094-9subject
Has Abstractpub_date
1999-01-01 00:00:00pages
75-82issue
1eissn
0198-8859issn
1879-1166pii
S0198885998000949journal_volume
60pub_type
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