Tetrahydrohyperforin Induces Mitochondrial Dynamics and Prevents Mitochondrial Ca2+ Overload after Aβ and Aβ-AChE Complex Challenge in Rat Hippocampal Neurons
Affiliations: [a] Centro de Envejecimiento y Regeneración (CARE), Santiago, Chile | [b] Departamento de Biología Celular y Molecular, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
Correspondence:
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Correspondence to: Dr. Nibaldo C. Inestrosa, CARE Biomedical Center, Faculty of Biological Sciences, P. Catholic University of Chile, Alameda 340, PO Box 114-D, Santiago, Chile. Tel.: +56 2 6862722; Fax: +56 2 6862959; E-mail: ninestrosa@bio.puc.cl.
Abstract: St. John's wort has been the subject of studies focused on its therapeutic properties against several diseases, including Alzheimer's disease (AD). Amyloid β-peptide (Aβ), a critical peptide in AD, has been linked to the mitochondrial dysfunction often observed in this disease. Despite many efforts to prevent Aβ levels from increasing in AD, less has been done regarding the mitochondrial component. Therefore, we studied the effects of tetrahydrohyperforin (THH) on mitochondrial dysfunction of hippocampal neurons, challenged with Aβ oligomers (Aβo) and Aβo-AChE complexes. We show that THH prevents mitochondrial calcium overload and induces the modulation of fusion-fission events, arresting mitochondrial dysfunction. Moreover, our results suggest that the modulation of mitochondrial dynamics probably occurs through a peroxisome proliferator-activated receptor γ co-activator 1α-mediated mechanism, inducing mitochondrial fusion-fission protein expression. Our results offer further explanation for the effects observed for THH and the beneficial effects of this ethno-botanical drug in AD.
