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Volume 272, Number 26, Issue of June 27, 1997 pp. 16085-16088
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.

COMMUNICATION:
Intracellular Generation and Accumulation of Amyloid beta -Peptide Terminating at Amino Acid 42

(Received for publication, March 31, 1997, and in revised form, May 5, 1997)

Christine Wild-Bode Dagger , Tsuneo Yamazaki , Anja Capell Dagger , Uwe Leimer Dagger , Harald Steiner Dagger , Yasuo Ihara and Christian Haass Dagger

From the Dagger  Central Institute of Mental Health, Department of Molecular Biology, J5, 68159 Mannheim, Germany and the  Department of Neuropathology, Institute for Brain Research, Faculty of Medicine, University of Tokyo, Tokyo 113, Japan

Amyloid beta -peptide (Abeta ) is known to accumulate in senile plaques of Alzheimer's disease (AD) patients and is now widely believed to play a major role in the disease. Two populations of peptides occur terminating either at amino acid 40 or at amino acid 42 (Abeta 1-40 and Abeta 1-42). Alternative N-terminal cleavages produce additional heterogeneity (Abeta x-40 and Abeta x-42). Peptides terminating at amino acid 42 are believed to be the major player in sporadic AD as well as familial AD (FAD). Whereas the cellular mechanism for the generation of Abeta terminating at amino acid 40 is well understood, very little is known about the cleavage of Abeta after amino acid 42. By using two independent methods we demonstrate intracellular Abeta 1-42 as well as Abeta x-42 but less Abeta x-40 and Abeta 1-40 in kidney 293 cells stably transfected with wild type beta -amyloid precursor protein (beta APP) or the FAD-associated Val/Gly mutation. Moreover, retention of beta APP within the endoplasmic reticulum (ER) by treatment with brefeldin A does not block the cleavage at amino acid 42 but results in an increased production of all species of Abeta terminating at amino acid 42. This indicates that the cleavage after amino acid 42 can occur within the ER. Treatment of cells with monensin, which blocks transport of (beta APP) within the Golgi causes a marked accumulation of intracellular Abeta x-42 and Abeta x-40. Therefore these experiments indicate that the gamma -secretase cleavage of Abeta after amino acid 42 can occur within the ER and later within the secretory pathway within the Golgi. Moreover inhibition of reinternalization by cytoplasmic deletions of beta APP as well as inhibition of intracellular acidification by NH4Cl does not block intracellular Abeta 1-42 or Abeta x-42 production.


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