N-Terminal Truncated Aβ4-42 Is a Substrate for Neprilysin Degradation in vitro and in vivo.

Autor:	Hornung, Karen, Zampar, Silvia, Engel, Nadine, Klafki, Hans, Liepold, Thomas, Bayer, Thomas A., Wiltfang, Jens, Jahn, Olaf, Wirths, Oliver
Předmět:	NEPRILYSIN ALZHEIMER'S disease MASS spectrometry TRANSGENIC mice PEPTIDES AMYLOID ANIMAL experimentation COMPARATIVE studies RESEARCH methodology MEDICAL cooperation MICE NEURONS PROTEOLYTIC enzymes RESEARCH EVALUATION research
Zdroj:	Journal of Alzheimer's Disease; 2019, Vol. 67 Issue 3, p849-858, 10p
Abstrakt:	In sporadic Alzheimer's disease (AD), an imbalance between production and clearance of amyloid-β (Aβ) peptides seems to account for enhanced Aβ accumulation. The metalloprotease neprilysin (NEP) is an important Aβ degrading enzyme as shown by a variety of in vitro and in vivo studies. While the degradation of full-length Aβ peptides such as Aβ1-40 and Aβ1-42 is well established, it is less clear whether NEP is also capable of degrading N-terminally truncated Aβ species such as the common variant Aβ4-42. In the present report, we confirmed the degradation of Aβ4-x species by neprilysin using in vitro digestion and subsequent analysis using gel-based assays and mass spectrometry. By crossing Tg4-42 mice expressing only Aβ4-42 peptides with homozygous NEP-knock-out mice (NEP-/-), we were able to demonstrate that NEP deficiency increased hippocampal intraneuronal Aβ levels and aggravated neuron loss in the Tg4-42 transgenic mouse model of AD. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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