Bartlett SF, Lagercrantz H, Smith AD. Gel electrophoresis of soluble and insoluble proteins of noradrenergic vesicles from ox splenic nerve: a comparison with proteins of adrenal chromaffin granules.
Neuroscience 2001;
1:339-44. [PMID:
11370518 DOI:
10.1016/0306-4522(76)90061-0]
[Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Polyacrylamide gel electrophoresis of a soluble extract of purified large dense-cored vesicles (noradrenergic vesicles) from ox splenic nerve revealed 13 proteins, 7 of which had mobilities close to those of seven of the soluble proteins in adrenal chromaffin granules. Two of these proteins had the same mobilities as dopamine beta-hydroxylase and chromogranin A, respectively. The relative staining intensities of the latter two proteins were different: in noradrenergic vesicles, there was more dopamine beta-hydroxylase than chromogranin A; whereas in chromaffin granules, chromogranin A was the major protein. Gel electrophoresis of the water-insoluble proteins of noradrenergic vesicles, dissolved in sodium dodecylsulphate, revealed 5 proteins, 5 of which had mobilities close to those of 5 proteins present in the membranes of chromaffin granules. Three of these proteins had mobilities similar to those of dopamine beta-hydroxylase, chromogranin A and chromomembrin B, respectively. One of the proteins was probably serum albumin, which was also present as a contaminant in the soluble extract of noradrenergic vesicles. These findings are consistent with earlier studies in which dopamine beta-hydroxylase, chromogranin A and chromomembrin B have been identified as constituents of noradrenergic vesicles by enzymatic or immunochemical assay methods. They also indicate further qualitative similarities between the noradrenergic vesicle and the chromaffin granule, in that a total of 7 soluble and 5 insoluble proteins might be common to both particles. However, gel electrophoresis also confirms that quantitative differences exist between the relative proportions of the soluble proteins and shows that dopamine beta-hydroxylase is the major soluble protein of the noradrenergic vesicles isolated from splenic nerve trunks.
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