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J. Cell Biol.
© The Rockefeller University Press
0021-9525/97/08/671/10 $2.00
Volume 138, Number 3, August 11, 1997 671-680

Novel beta -Secretase Cleavage of beta -Amyloid Precursor Protein in the Endoplasmic Reticulum/Intermediate Compartment of NT2N Cells

Abraham S.C. Chyung,* Barry D. Greenberg,Dagger David G. Cook,* Robert W. Doms,* and Virginia M.-Y. Lee*

* Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104; and Dagger  Cephalon, Incorporated, West Chester, Pennsylvania 19380

Previous studies have demonstrated that NT2N neurons derived from a human embryonal carcinoma cell line (NT2) constitutively process the endogenous wild-type beta -amyloid precursor protein (APP) to amyloid beta  peptide in an intracellular compartment. These studies indicate that other proteolytic fragments generated by intracellular processing must also be present in these cells. Here we show that the NH2-terminal fragment of APP generated by beta -secretase cleavage (APPbeta ) is indeed produced from the endogenous full length APP (APPFL). Pulse-chase studies demonstrated a precursor-product relationship between APPFL and APPbeta as well as intracellular and secreted APPbeta fragments. In addition, trypsin digestion of intact NT2N cells at 4°C did not abolish APPbeta recovered from the cell lysates. Furthermore, the production of intracellular APPbeta from wild-type APP appears to be a unique characteristic of postmitotic neurons, since intracellular APPbeta was not detected in several non-neuronal cell lines. Significantly, production of APPbeta occurred even when APP was retained in the ER/ intermediate compartment by inhibition with brefeldin A, incubation at 15°C, or by expression of exogenous APP bearing the dilysine ER retrieval motif.


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