Effects of molecular oxygen on chick limb bud chondrogenesis

Differentiation; Research in Biological Diversity
P M HwangP A Kitos

Abstract

Chondrogenesis is an important process in the development of the embryonic chick limb. If limb buds are dispersed just prior to the initiation of chondrogenic differentiation and their cells seeded densely in culture as three-dimensional "micromasses," some of the cells differentiate to form chondrogenic nodules. These nodules characteristically produce sulfated proteoglycans and type II collagen. Two conditions within the early avian limb core have been linked causatively to the initiation of chondrogenesis: a limitation in the availability of molecular oxygen and a low NAD content of the tissue. The O2 limitation is thought to be responsible for the low NAD level. We examined the effects of molecular oxygen on the NAD content of chick limb-bud cells in micromass culture, the formation of chondrocytic nodules, and the production of type II collagen and sulfated proteoglycans. The NAD content of the cells in the micromasses and the production of type II collagen did not vary greatly as a function of oxygen availability. The development of the nodules was modified, but not eliminated, by high oxygen partial pressure (0.95). It was eliminated by anoxia. Proteoglycan synthesis was decreased significantly by high oxygen tension and...Continue Reading

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Citations

Dec 18, 2001·Developmental Dynamics : an Official Publication of the American Association of Anatomists·M Yin, M Pacifici

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