Summary
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1.
A micromethod is presented which allows a separation of GAG according to their anionic behaviour on ECTEOLA-cellulose columns in routine studies. Three fractions with increasing anionic behaviour (F I, FII, FIII) have been chosen to characterise GAG. After labelling GAG in vivo the uronic acid content (carbazol reaction) and35S incorporation have been measured in each fraction.
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2.
The uronic acid content and35S incorporation have been studied at different stages of embryonic development in the rat. The total amount of GAG per dry weight is found to increase with embryonic age. This is accompanied by an increase in the percentage of high-anionic GAG (F II and F III).
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3.
Several experimental conditions have been found to effect the kinetics of35S within the maternal organism, thus leading to a difference in the availability of35S in embryonic GAG. So total35S incorporation rates into GAG often do not represent the rates of biosynthesis of GAG.
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4.
After labelling GAG with35S in vivo, the35S-pattern of the three fractions obtained from Ecteola-cellulose columns is characteristic of a given tissue and furthermore may be used as a measure for changes occuring within the GAG under different experimental conditions.
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5.
Since in pharmacological studies the rate of incorporation of35S into GAG may not directly reflect GAG metabolism, the distribution of uronic acids as well as35S radioactivity within the three GAG fractions is suggested as a measure for changes occuring in GAG metabolism. This takes into account that under pharmacological or pathological conditions a change of the anionic behaviour of GAG may take place. The ratio of35S incorporation into two fractions\(\left( {R{}^{35}Si\frac{{III}}{{II}}or\frac{{III}}{I}} \right)\) is taken as an indication of a change in the GAG pattern. A number of parameters influencing these ratios are discussed.
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This work was generously supported by grants from the Deutsche Forschungsgemeinschaft given to the Sonderforschungsbereich 29, “Embryonale Entwicklung und Differenzierung (Embryonal-Pharmakologie)”.
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Schimmelpfennig, K., Baumann, I. & Kaufmann, C. Studies on glycosaminoglycans (GAG) in mammalian embryonic tissue. Naunyn-Schmiedebergs Arch. Pharmak. 271, 430–456 (1971). https://doi.org/10.1007/BF00997129
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DOI: https://doi.org/10.1007/BF00997129