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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 30 (1980), S. 183-189 
    ISSN: 1432-0827
    Keywords: Proteoglycans ; Glycosaminoglycans ; Epiphyseal cartilage ; Congenital limb defect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary Proteoglycans were extracted with 4 M guanidine HC1 solution containing protease inhibitors from various zones of human epiphyseal cartilages of the normally ossifying fibula and cartilaginous rudiment of the tibia of a 12-month-old boy with congenital absence of the tibia, when the knee disarticulation was performed. All the proteoglycan preparations from the epiphyseal cartilages were separated with a sucrose density gradient centrifugation into two components; a heavy, major component and a light one. The molecular size and the proportion of isomeric chondroitin sulfates of polysaccharides of the heavy component differed from those of the light one. The relative amounts of isomeric chondroitin sulfates in the polysaccharide moieties of the components also varied among these zones. The glycosaminoglycan content in the rudimentary tibia was equal to that of the epiphyseal cartilage of the fibula. However, proteoglycan preparations showed neither the normal sedimentation profile with two peaks nor the zonal differences as to the proportion of isomeric chondroitin sulfates. These results suggest that the alterations in proteoglycan metabolism might be involved in the pathogenetic mechanisms producing the congenital limb defect.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 23 (1977), S. 271-275 
    ISSN: 1432-0827
    Keywords: Pseudarthrosis ; Glycosaminoglycans ; Dermatan sulfate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary Light and electron microscopic studies on cells and matrices of congenital pseudarthrosis of the femur of a 5.5-year-old male revealed three areas with different morphological features; a fibrous area, a cartilaginous area and an osseous area. Glycosaminoglycans were isolated from each of the three areas and characterized by the degradation with chondroitinases. Although chondroitin sulfate was the major component in all regions, a significant amount of dermatan sulfate occurred in the fibrous area. A small amount of hyaluronic acid was found in both fibrous and osseous areas. These results suggest that the peculiar composition of glycosaminoglycans in the affected part may account for some clinical aspects of the disease which resists treatment.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1459
    Keywords: Malignant hypertension ; CSF lactate ; CSF protein ; Intracranial pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei 21 Patienten mit maligner Hypertonie, 19 mit benigner Hypertonie und 21 mit normalem Blutdruck wurden in Blut und Liquor die Lactat- und Pyruvatkonzentrationen sowie die Säure-Basen-Parameter gemessen. Die Werte für das Lactat bzw. für das Lactat-Pyruvat-Verhältnis im Liquor waren bei Patienten mit maligner Hypertonie signifikant höher (1,90±0,10 mM/1, 19,2±1,0) als bei den Patienten mit benigner Hypertonie (1,50±0,05 mM/1, 15,7±0,7) bzw. bei normotensiven Individuen (1,44±0,04 mM/1, 15,7±0,4). Es bestand eine lineare Korrelation zwischen den Lactatwerten und dem Druck im Liquor (r=0,565, P〈0,01), wobei dies außerdem korrelierte mit einem mittleren arteriellen Blutdruck von mehr als 150 mm Hg (r=0,553, P〈0,01). Diese Zunahme in den Säuremetaboliten im Liquor weist darauf hin, daß der Hirnstoffwechsel bei maligner Hypertonie in eine anaerobe Phase tritt, wahrscheinlich wegen des erhöhten intrakraniellen Druckes. Es wird auch die Möglichkeit einer erhöhten cerebralen Gefäßdurchlässigkeit als mitbeteiligter Mechanismus erwogen.
    Notes: Summary Lactate and pyruvate concentrations and acid-base parameters in cerebrospinal fluid (CSF) and arterial blood were measured in 21 patients with malignant hypertension (MHT), 19 with benign hypertension (BHT) and 21 normotensive subjects (NT). Average values for CSF lactate and lactate/pyruvate (L/P) ratio were significantly higher in MHT (1.90±10mM/1, 19.2±1.0) than in either BHT (1.50±0.05 mM/1, 15.7±0.7) or NT (1.44±0.04 mM/1, 15.7±0.4). There was a linear correlation between CSF lactate and CSF pressure (r=0.565, P〈0.01), and the latter was also related to mean arterial pressure exceeding 150 mm Hg (r=0.553, P〈0.01). Such increases in the acid metabolites in CSF indicate that brain metabolism becomes anaerobic in MHT, probably due to increased intracranial prssure. Increased cerebrovascular permeability is also discussed as participating in causal mechanisms.
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