Studies in this project address the basic phenotype of the engrafting hematopoietic stem cell. Initial studies have shown that a cocktail of cytokines including IL-11, IL-3, IL-6 and steel factor or steel factor alone induce a profound engraftment defect in either normal host mice (male/female BALB/c transplant model) or lethally irradiated hosts (Ly5.1/Ly5.2 congenic transplant model or male/female BALB/c model). We plan to continue a characterization of the development of this engraftment defect, utilizing competitive transplantation of either male versus female or ly5.1 verses ly5.2 cells into appropriate lethally irradiated hosts. We will compete cytokine treated cells verses normal explant cells in these studies. Utilizing these models we will then assess whether or not we can create conditions in vitro allowing for the maintenance and survival of nonproliferating engrafting stem cells and whether utilizing such conditions we can take cytokine treated proliferating stem cells in vitro and quiesce them and reverse their phenotype to that of an engraftable stem cell. We are also carrying out synchronization studies utilizing Rhodaminelow Hoechstlow purified cells growth in cytokines and then subjected to various manipulation s to arrest cells in different points of cycle such as isoleucine deprivation or aphidocholin exposure in order to obtain highly synchronized populations of cells for study. The goal here would be to take dormant cells, stimulate their progression through cycle probably with steel factor and evaluate the capacity to engraft while dormant, in early G1, in S phase and (as a major goal of the project) in a second G1. Success to integrate retroviruses into proliferating stem cells and then return these cells to engraftability by reversing the engraftment defect.
| Dooner, Gerri J; Colvin, Gerald A; Dooner, Mark S et al. (2008) Gene expression fluctuations in murine hematopoietic stem cells with cell cycle progression. J Cell Physiol 214:786-95 |
| Colvin, Gerald A; Lambert, Jean-Francois; Dooner, Mark S et al. (2007) Murine allogeneic in vivo stem cell homing(,). J Cell Physiol 211:386-91 |
| Kieusseian, Aurelie; Chagraoui, Jalila; Kerdudo, Cecile et al. (2006) Expression of Pitx2 in stromal cells is required for normal hematopoiesis. Blood 107:492-500 |
| Aliotta, Jason M; Keaney, Patrick; Passero, Michael et al. (2006) Bone marrow production of lung cells: the impact of G-CSF, cardiotoxin, graded doses of irradiation, and subpopulation phenotype. Exp Hematol 34:230-41 |
| Zhang, Hui Z; Degar, Barbara A; Rogoulina, Svetlana et al. (2006) Hematopoiesis following disruption of the Pitx2 homeodomain gene. Exp Hematol 34:167-78 |
| Abedi, Mehrdad; Greer, Deborah A; Foster, Bethany M et al. (2005) Critical variables in the conversion of marrow cells to skeletal muscle. Blood 106:1488-94 |
| Quesenberry, Peter J; Colvin, Gerald; Abedi, Mehrdad (2005) Perspective: fundamental and clinical concepts on stem cell homing and engraftment: a journey to niches and beyond. Exp Hematol 33:9-19 |
| Quesenberry, Peter J; Colvin, Gerald A; Abedi, Mehrdad et al. (2005) The stem cell continuum. Ann N Y Acad Sci 1044:228-35 |
| D'Hondt, Lionel; McAuliffe, Christina; Damon, Jeffrey et al. (2004) Circadian variations of bone marrow engraftability. J Cell Physiol 200:63-70 |
| Colvin, G A; Lambert, J-F; Abedi, M et al. (2004) Murine marrow cellularity and the concept of stem cell competition: geographic and quantitative determinants in stem cell biology. Leukemia 18:575-83 |
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