Abstract: The present invention relates to a three-dimensional cell culture system which can be used to culture a variety of different cells and tissues in vitro for prolonged periods of time. In accordance with the invention, cells derived from a desired tissue are inoculated and grown on a pre-established stromal support matrix. The stromal support matrix comprises stromal cells, such as fibroblasts actively growing on a three-dimensional matrix. Stromal cells may also include other cells found in loose connective tissue such as endothelial cells, macrophages/monocytes, adipocytes, pericytes, reticular cells found in bone marrow stroma, etc. The stromal matrix provides the support, growth factors, and regulatory factors necessary to sustain long-term active proliferation of cells in culture. When grown in this three-dimensional system, the proliferating cells mature and segregate properly to form components of adult tissues analogous to counterparts found in vivo.

Abstract: According to the present invention there is provided a process for treating a person whose bone marrow has been destroyed or lost its functional ability. The process includes the steps of obtaining bone marrow from a donor, cryropreserving the marrow, replicating the bone marrow cells in vitro, and then infusing the replicated bone marrow cells into a person whose bone marrow has been destroyed or functionally compromised by disease or the treatment of disease. The person receiving the replicated bone marrow infusion may be the donor or another person. There is also disclosed a process for replicating bone marrow in vitro.