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Age-dependent change in the gel-electrophoretic pattern of proteoglycans of human growth cartilage
Insights
Proteoglycan patterns in developing cartilage differ between fetuses and children. This significant change in proteoglycans occurs during early extrauterine life, impacting bone development.
Area of Science:
- Biochemistry
- Developmental Biology
- Orthopedics
Background:
- Proteoglycans are crucial components of cartilage extracellular matrix.
- Understanding proteoglycan changes during development is vital for skeletal health.
- Previous research has not fully elucidated proteoglycan alterations in early human development.
Purpose of the Study:
- To investigate the developmental changes in proteoglycan electrophoretic patterns.
- To identify the specific age at which proteoglycan composition shifts in human cartilage.
Main Methods:
- Tibial growth cartilage was extracted from human subjects across various developmental stages (fetuses to children).
- Proteoglycans were dissociated and purified using guanidinium chloride extraction, urea dialysis, and ion-exchange chromatography.
- Gel electrophoresis on polyacrylamide agarose gels was employed to analyze proteoglycan patterns.
Main Results:
- Distinct gel-electrophoretic patterns of proteoglycans were observed between fetal and childhood cartilage.
- A significant transition in proteoglycan composition was identified during the early months of extrauterine life.
Conclusions:
- Proteoglycan structure undergoes a notable transformation in the initial months post-birth.
- These findings highlight critical developmental shifts in cartilage matrix composition during early human life.
Abstract:
The gel-electrophoretic pattern of dissociated proteoglycans was studied in 7 fetuses, 5 premature newborns, 4 term newborns, 5 infants and 5 children. The tibial growth cartilage was extracted with 4 M guanidinium chloride. After dialysis against 8 M urea at pH 7 the proteoglycans were obtained by ion chromatography in urea on DEAE cellulose and submitted to gel electrophoresis on polyacrylamide agarose gels. Gel electrophoresis of proteoglycans showed a different pattern in fetuses from that found in children. The change occurs in the first months of extrauterine life.