The chondrogenic potential of periosteum decreases with age

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
S W O'DriscollJ S Fitzimmons

Abstract

Periosteum contains undifferentiated mesenchymal stem cells that possess the potential for chondrogenesis during cartilage repair and in fracture healing. With aging, the chondrogenic potential of periosteum declines significantly. An organ-culture model was used to investigate the relationship between the chondrogenic potential of periosteum and aging. A total of 736 periosteal explants from the proximal medial tibiae of 82 rabbits, aged 2 weeks to 2 years, were cultured in agarose suspension conditions conductive for chondrogenesis. and analyzed using histomorphometry, collagen typing, wet weight measurement, 3H-thymidine and 35S-sulfate uptake, autoradiography, and PCNA immunostaining. The rabbits were skeletally mature by 6 months and stopped increasing in weight by 12 months. Chondrogenesis declined significantly with age (P < 0.0001) and was maximal in the 1.5-2 month-old rabbits. Explants from the 6 month-old rabbits formed 50% less cartilage. and by 12 months chondrogenesis reached a steady state minimal level. In parallel with this decrease in chondrogenic potential similar decreases were measured in 3H-thymidine uptake (P < 0.0001). 35S-sulfate uptake (P = 0.0117), as well as the thickness (P < 0.0001) and the total n...Continue Reading

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