Cultivation of rat marrow-derived mesenchymal stem cells in reduced oxygen tension: effects on in vitro and in vivo osteochondrogenesis

Journal of Cellular Physiology
D P LennonA I Caplan

Abstract

Rat mesenchymal stem cells (rMSCs) represent a small portion of the cells in the stromal compartment of bone marrow and have the potential to differentiate into bone, cartilage, fat, and fibrous tissue. These mesenchymal progenitor cells were maintained as primary isolates and as subcultured cells in separate closed modular incubator chambers purged with either 95% air and 5% CO(2) (20% or control oxygen) or 5% oxygen, 5% CO(2), and 90% nitrogen (5% or low oxygen). At first passage, some cells from each oxygen condition were loaded into porous ceramic vehicles and implanted into syngeneic host animals in an in vivo assay for osteochondrogenesis. The remaining cells were continued in vitro in the same oxygen tension as for primary culture or were switched to the alternate condition. The first passage cells were examined for in vitro osteogenesis with assays involving the quantification of alkaline phosphatase activity and calcium and DNA content as well as by von Kossa staining to detect mineralization. Cultures maintained in low oxygen had a greater number of colonies as primary isolates and proliferated more rapidly throughout their time in vitro, as indicated by hemacytometer counts at the end of primary culture and increased...Continue Reading

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