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Immunochemische Untersuchungen zur Identifizierung eines äthanollöslichen Myelinhaptens

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Summary

For identification of the alcoholsoluble haptens of the nervous system, the agar precipitation test was employed. Ethanolic organ extracts and ethanolic solutions of cerebroside, cholesterol, cephalin, lecithin and sphingomyelin were tested, both individually and in different combinations, against EAE* sera. For this test the ethanolic lipid solutions were diluted with distilled water at a ratio 1:4.

A chromatographically homogenous cerebron or a cerebroside mixture precipitates in diffusion against EAE sera only after addition of cholesterol and lecithin. The optimal molar weight ratio of cerebroside: cholesterol:lecithin is 2:4:1. We also achieved a positive precipitation test with cerebroside-cholesterol-sphingomyelin mixtures. By saturating EAE sera with emulsions of cerebroside-cholesterol-lecithin all antibodies can be adsorbed which react with ethanolic extracts from nerve, brain and spinal cord of various animal species.

Starting with literature studies and own test results, it is discussed whether cholesterol and lecithin are functioning as so-called auxiliary lipids and in what molecular configuration cerebroside, cholesterol and lecithin are present in the particles of the lipid emulsion.

The hapten function of the cerebroside was derived from sensibilization experiments. After injection of cerebron, bovine serum albumin and adjuvant, rabbits produce anti-sera which behave like EAE sera. These sera precipitate with emulsions from nerve extracts and with cerebroside-cholesterol-lecithin emulsions. Cerebroside becomes serologically inactive by splitting off the sugar group. Analogously, hydrolyzed brain material loses its ability to precipitate.

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Auszugsweise vorgetragen auf dem Symposium über „Experimentelle Beiträge zur Pathogenese der Entmarkungsencephalomyelitiden“ (Hamburg, August 1962).

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Niedieck, B., Pette, E. Immunochemische Untersuchungen zur Identifizierung eines äthanollöslichen Myelinhaptens. Klin Wochenschr 41, 773–778 (1963). https://doi.org/10.1007/BF01478025

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