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Distinct distribution of immunoreactive dynorphin and leucine enkephalin in various populations of isolated adrenal cromaffin cells.

Abstract：

:The distribution of immunoreactive-dynorphin (ir-Dyn) in isolated subpopulations of bovine adrenal chromaffin cells was examined and compared with that of adrenaline (A), noradrenaline (NA) and ir-Leucine-Enkephalin (ir-Leu-Enk). Using a stepwise bovine serum albumin (BSA) gradient, various populations of catecholamine-storing cells were separated and designated as cell layers I, II and III. Cell layer I contained more NA than A; cell layer II contained slightly more A than NA whereas cell layer III was highly enriched in A. The original cell preparation contained 2.9 times more ir-Leu-Enk than ir-Dyn (4.7 and 1.6 pmoles per 10(6) cells, respectively). After separation of the cells on BSA gradient, ir-Dyn was mainly detected in cell layer I (4.0 pmoles/10(6) cells) whereas ir-Leu-Enk was concentrated in cell layer III (8.3 pmoles/10(6) cells). Both peptides were secreted in response to acetylcholine (5 x 10(-5) M), but the amount secreted was in accordance with the cell content in each peptide. After subcellular fractionation of the adrenal medulla, the neuropeptides were found in close association with catecholamines in the secretory granules. These results indicate that bovine adrenal chromaffin cells can be isolated according to their specific content in A, NA and opioid peptides and are consistent with the hypothesis of distinct biosynthetic pathways for Dyn and the Enk.

journal_name

Life Sci

journal_title

Life sciences

authors

Dumont M,Day R,Lemaire S

doi

10.1016/0024-3205(83)90042-5

subject

Has Abstract

pub_date

1983-01-17 00:00:00

pages

287-94

issue

3

eissn

0024-3205

issn

1879-0631

pii

0024-3205(83)90042-5

journal_volume

32

pub_type

杂志文章

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