Donor Hematopoietic Cell Tracking In Vivo at the Homing Phase of Allo-Bone Marrow Transplantation in Mice / 中国实验血液学杂志

ABSTRACT

It has been well-known that intravenously infused hematopoietic stem and progenitor cells can home to the bone marrow and reconstitute hematopoiesis. However, little is understood about the homing efficiency or percentage of infused stem and progenitor cells. In order to examine distribution pattern of infused hematopoietic cells in the organs and tissues, a direct assay system to trace transplanted cells in vivo by employing PKH-26, a red fluorescent membrane dye, to label hematopoietic cells in inbred strain of mice transplanted cells (stem cell antigen-1 positive subpopulation cell, Sca-1(+) cells) was introduced. The numbers of labeled cells was measured by means of flow cytometry and fluorescence microscopy. The early fate of infused Sca-1(+) donor bone marrow cells after intravenous administration in a allogeneic mouse model was examined. The presence of infused donor cells with the fluorescent dye PKH-26 was evaluated within 60 hours in hematopoietic organ (bone marrow and spleen) and non-hematopoietic organ (lungs and liver) of recipients. The data showed that (1) Following intravenous infusion, Sca-1(+) donor bone marrow cells were detained in lungs shortly. (2) Sca-1(+) donor bone marrow cells localized to both hematopoietic organ (bone marrow and spleen) and non-hematopoietic organ (lungs and liver) for periods of up to 60 hours following infusion, however, the number of donor hematopoietic cells localized to bone marrow was more than that localized to non-hematopoietic organ (P < 0.05). These results indicated that there were also donor early hematopoietic cells in non-hematopoietic organ of recipients at the homing phase in allo-BMT mice.