Immunoglobulin-derived polypeptides enter the regulated secretory pathway in AtT-20 cells.

Abstract:

:Constitutively secreted proteins have traditionally been believed to be excluded from the regulated secretory pathway. In this work we show that kappa light chain and Fc fragment, two markers of the constitutive pathway, are present in the regulated pathway in AtT-20 cells. They colocalize with the endogenous hormone ACTH and they exhibit stimulus-dependent secretion. The Fc fragment, which undergoes intracellular transport at the same rate as the ACTH precursor POMC, enters the forming secretory granules, however, it is partially lost during granule maturation. These observations show that classic constitutive secretory markers are not excluded from the regulated secretory pathway and that efficient sorting for regulated secretion occurs above a background of proteins which enter the granules without sorting.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Castle AM,Huang AY,Castle JD

doi

10.1016/s0014-5793(98)01398-2

subject

Has Abstract

pub_date

1998-11-20 00:00:00

pages

341-5

issue

3

eissn

0014-5793

issn

1873-3468

pii

S0014-5793(98)01398-2

journal_volume

439

pub_type

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