Dose-dependent folic acid and memantine treatments promote synergistic or additive protection against Aβ(25-35) peptide-induced apoptosis in SH-SY5Y cells mediated by mitochondria stress-associated death signals.
Increased dietary folic acid (FA) is associated with reduced risks of Alzheimer's disease (AD). The AD drug memantine (Mn) has had limited therapeutic effects for the treatment of patients with moderate to severe AD. This study investigated whether and the underlying mechanisms by which the combination of Mn and FA may have synergistic or additive effects in protecting against amyloid-β(25-35) peptide (Aβ)-induced neurocytotoxicity. Aβ treatment of human neuroblastoma SH-SY5Y cells significantly induced a 6-fold increase of apoptotic cells compared with the Aβ-untreated group. Preincubation of Aβ-exposed cells with FA (500 μM) or Mn (20 μM) caused a 22% and 10% reduction of apoptotic cells, respectively, whereas the combo-treatments at such doses synergistically alleviated Aβ-induced apoptosis by 60% (P<0.05). The apoptotic protection by the combo-treatments coincided with attenuating Aβ-elicited mitochondrial (mt) membrane depolarization and abolishing Aβ-induced mt cytochrome c release to the cytosol. Increased levels of FA at 1000 μM in combination with 20 μM Mn exerted an additive protection against Aβ(25-35)-induced-apoptosis as compared to the isolate Mn group (P<0.05). The combo-treatments reversed Aβ-elicited mt membrane depolarization, attenuated Aβ-elicited mt cytochrome c release to the cytosol, and diminished Aβ-promoted superoxide generation. The apoptotic-protection by such combo-treatments was partially abolished by carbonyl cyanide 3-chlorophenylhydrazone (mt membrane potential uncoupler) and sodium azide (mt cytochrome c oxidase inhibitor). Taken together, the data demonstrated that dose-dependent FA and Mn synergistically or additively protected SH-SY5Y cells against Aβ-induced apoptosis, which was partially, if not completely, mediated by mt stress-associated death signals.
Department of Neurology, National Taiwan University Hospital, College of Medicine, National Taiwan University, Taiwan, ROC.
Ta-Fu
TF
Chen
Ming-Chi
MC
Tang
Chia-Hui
CH
Chou
Ming-Jang
MJ
Chiu
R-F S
RF
Huang
D016229:Amyloid beta-Peptides / Q000009:adverse effects*; D017209:Apoptosis / Q000187:drug effects*; D020013:Calcium Signaling / Q000187:drug effects; D045744:Cell Line, Tumor; D045304:Cytochromes c / Q000378:metabolism; D003620:Dantrolene / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D004357:Drug Synergism; D005492:Folic Acid / Q000008:administration & dosage / Q000494:pharmacology*; D006801:Humans; D006835:Hydrazones / Q000494:pharmacology; D008559:Memantine / Q000008:administration & dosage / Q000494:pharmacology*; D053078:Membrane Potential, Mitochondrial / Q000187:drug effects; D008928:Mitochondria / Q000187:drug effects / Q000378:metabolism; D018696:Neuroprotective Agents / Q000008:administration & dosage / Q000494:pharmacology*; D010446:Peptide Fragments / Q000009:adverse effects*; D017382:Reactive Oxygen Species / Q000378:metabolism
D016229:Amyloid beta-Peptides; D006835:Hydrazones; D018696:Neuroprotective Agents; D010446:Peptide Fragments; D017382:Reactive Oxygen Species; C074636:amyloid beta-protein (25-35); C070053:carbonyl 3-chlorophenylhydrazone; D045304:Cytochromes c; D005492:Folic Acid; D003620:Dantrolene; D008559:Memantine
2′,7′-dichlorodihydrofluorescin diacetate; 2′,7′-dichlorofluorescin; AD; AV; Alzheimer’s disease; Amyloid-β((25–35)) peptide; Apoptosis; Aβ((25–35)); CCCP; COX; DCF; DCFH-DA; FA; Folate; HE; Memantine; Mitochondrial death signal; Mn; Mt; N-acetyl-L-cysteine; N-methyl-D-aspartate; NAC; NMDA; PI; amyloid-β; annexin-V-FITC; carbonyl cyanide 3-chlorophenylhydrazone; cytochrome c oxidase; folic acid; hydroethidine; memantine; mitochondria; propidium iodide