Premium
Activity of the ligand for c‐mpl , thrombopoietin, in early haemopoiesis
Author(s) -
Itoh Ryugo,
Katayama Naoyuki,
Kato Takashi,
Mahmud Nadim,
Masuya Masahiro,
Ohishi Kohshi,
Minami Nobuyuki,
Miyazaki Horoshi,
Shiku Horoshi
Publication year - 1996
Publication title -
british journal of haematology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.907
H-Index - 186
eISSN - 1365-2141
pISSN - 0007-1048
DOI - 10.1046/j.1365-2141.1996.d01-1814.x
Subject(s) - thrombopoietin , haematopoiesis , progenitor cell , stem cell factor , biology , myeloid , medicine , interleukin 3 , immunology , stem cell , endocrinology , microbiology and biotechnology , t cell , immune system , antigen presenting cell
We examined the role of the ligand for c‐mpl , thrombopoietin (TPO), in murine early haemopoiesis, using a serum‐free culture system. TPO in combination with the ligand for c‐kit (SF) or interleukin‐3 (IL‐3) supported colony formation by marrow cells of 5‐fluorouracil (5‐FU)‐treated mice, whereas TPO alone yielded no colony. When blast cell colonies grown in the presence of TPO plus SF or TPO plus IL‐3 were individually replated in suspension cultures containing serum and several growth factors, various combinations of myeloid lineages were seen, indicating that the progenitors supported by TPO plus SF or TPO plus IL‐3 are multipotential. Delayed addition experiments demonstrated that TPO has the potential to effectively support the survival of haemopoietic progenitors. We then studied the effects of TPO on proliferative kinetics of cycling progenitors. TPO hastened IL‐3‐dependent growth of progenitors by shortening the time required for cell cycling. These results suggest that TPO, as a single factor, can support the survival of haemopoietic progenitors and TPO synergizes with SF or IL‐3 to act on early multipotential haemopoietic progenitors.