Overexpression of MTERF4 promotes the amyloidogenic processing of APP by inhibiting ADAM10.

ABSTRACT

Alzheimer's disease (AD) is characterized by the deposition of ß-amyloid (Aß) peptide in the brain, which is produced by the proteolysis of ß-amyloid precursor protein (APP). Recently, the mitochondrial transcription factor 4 (MTERF4), a member of the MTERF family, was implicated in regulating mitochondrial DNA transcription and directly in controlling mitochondrial ribosomal translation. The present study identified a novel role for MTERF4 in shifting APP processing toward the amyloidogenic pathway. The levels of MTERF4 protein were significantly increased in the hippocampus of APP/PS1 mice. In addition, the overexpression of MTERF4 induced a significant increase in the levels of APP protein and secreted Aß42 in HEK293-APPswe cells compared with control cells. Further, MTERF4 overexpression shifted APP processing from α-to ß-cleavage, as indicated by decreased C83 levels and elevated C99 levels. Finally, the MTERF4 overexpression suppressed a disintegrin and metalloproteinase 10 (ADAM10) expression via a transcriptional mechanism. Taken together, these results suggest that MTERF4 promotes the amyloidogenic processing of APP by inhibiting ADAM10 in HEK293-APPswe cells; therefore, MTERF4 may play an important role in the pathogenesis of AD.