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Biomedical subjects

J H Carson

Publications and source records attributed to J H Carson.

45 records · Page 3Linked to original sources
PubMed1978

Components in multiple sclerosis cerebrospinal fluid that are detected by radioimmunoassay for myelin basic protein.

Components in cerebrospinal fluid that are antigenically related to myelin basic protein have been identified by a technique described recently [Barbarese, E., Braun, P. E. & Carson, J. H. (1977) Proc. Natl. Acad. Sci. USA 74, 3360-3364] involving separating the cerebrospinal fluid proteins by sodium dodecyl sulfate/polyacrylamide gel electrophoresis and measuring the individual components by radioimmunoassay for myelin basic protein. Samples of cerebrospinal fluid from 48 different patients (23 with definite multiple sclerosis, 4 with suspected multiple sclerosis, and 21 with other neurological diseases) were examined by this technique. The results indicate that cerebrospinal fluid can contain at least three separate components that are detected by radioimmunoassay for myelin basic protein. On the basis of their apparent molecular weights, the three components were identified as follows: component I, intact myelin basic protein; component II, proteolytic fragments of myelin basic protein; and component III, a protein of unknown origin with an apparent molecular weight of 50,000. Most samples of cerebrospinal fluid (45 of 48) from patients with multiple sclerosis and from patients with other neurological diseases contained components I and II. Component III was detected in all of the samples from patients with definite multiple sclerosis, in three of four samples from patients with suspected multiple sclerosis, and in none of the samples from patients with other neurological diseases. Some implications of these findings are discussed.

Humans↗
PubMed1977

Identification of prelarge and presmall basic proteins in mouse myelin and their structural relationship to large and small basic proteins.

A new technique is described to identify antigenically related proteins by radioimmunoassay after sodium dodecyl sulfate/polyacrylamide gel fractionation. When adult mouse myelin was examined by this technique, four proteins that are antigenically related to the small myelin basic protein were identified. They were designated: prelarge (molecular weight 21,500), large (18,500), presmall (17,000), and small (14,000). The four proteins were isolated by elution from polyacrylamide gels, and each protein migrated as a single band when analyzed by either sodium dodecyl sulfate or acidic polyacrylamide gel electrophoresis. Serial dilutions of the purified proteins were measured by radioimmunoassay. Both the slope of the inhibition curve and the level of maximal inhibition for each protein were the same as for the small myelin basic protein, indicating that each of the four proteins contains all of the antigenic sites present in the small basic protein. Structural relationships among the four proteins were examined by using two-dimensional analysis of tryptic digests. The results showed that: large was similar in amino acid sequence to the major myelin basic protein from other species; small was identical in sequence to large, except for an internal deletion of approximately 40 amino acid residues: prelarge contained the sequence of large plus an additional sequence of 25-35 amino acid residues; and presmall contained the sequence of small plus the same additional sequence as in prelarge. The four proteins were also treated with 2-(2-nitrophenylsulfenyl)-3-methyl-3'-bromoindolienine (BNPS-skatole) which cleaves proteins specifically at tryptophan residues. Analysis of the cleavage products indicated that the additional amino acid sequence in both prelarge and presmall extends from the amino terminus of the molecule. Several implications of these results are discussed.

Animals↗
PubMedDate not supplied

RNA on the road to myelin.

In oligodendrocytes some mRNAs are transported from the perikaryon to the distal processes and localized in the myelin compartment where they are translated. This review describes the cis-acting signals and trans-acting factors that mediate intracellular trafficking of myelin basic protein (MBP) RNA, the prototype for such mRNAs in myelinating glia.

Animals↗