Djordjevic 2017 Neuroscience
| Djordjevic J, Thomson E, Chowdhury SR, Snow WM, Perez C, Wong TP, Fernyhough P, Albensi BC (2017) Brain region- and sex-specific alterations in mitochondrial function and NF-ΞΊB signaling in the TgCRND8 mouse model of Alzheimer's disease. Neuroscience 361:81-92. |
Djordjevic J, Thomson E, Chowdhury SR, Snow WM, Perez C, Wong TP, Fernyhough P, Albensi BC (2017) Neuroscience
Abstract: Alzheimer's disease (AD) is the most common late onset neurodegenerative disorder with indications that women are disproportionately affected. Mitochondrial dysfunction has been one of the most discussed hypotheses associated with the early onset and progression of AD, and it has been attributed to intraneuronal accumulation of amyloid Ξ² (AΞ²). It was suggested that one of the possible mediators for AΞ²-impaired mitochondrial function is the nuclear factor kappa B (NF-ΞΊB) signaling pathway. NF-ΞΊB plays important roles in brain inflammation and antioxidant defense, as well as in the regulation of mitochondrial function, and studies have confirmed altered NF-ΞΊB signaling in AD brain. In this study, we looked for sex-based differences in impaired bioenergetic processes and NF-ΞΊB signaling in the AD-like brain using transgenic (Tg) CRND8 mice that express excessive brain AΞ², but without tau pathology. Our results show that mitochondrial dysfunction is not uniform in affected brain regions. We observed increased basal and coupled respiration in the hippocampus of TgCRND8 females only, along with a decreased Complex II-dependent respiratory activity. Cortical mitochondria from TgCRND8 mice have reduced uncoupled respiration capacity, regardless of sex. The pattern of changes in NF-ΞΊB signaling was the same in both brain structures, but was sex specific. Whereas in females there was an increase in all three subunits of NF-ΞΊB, in males we observed increase in p65 and p105, but no changes in p50 levels. These results demonstrate that mitochondrial function and inflammatory signaling in the AD-like brain is region- and sex-specific, which is an important consideration for therapeutic strategies. β’ Keywords: Alzheimerβs disease, NF-ΞΊB, TgCRND8, Cortex, Hippocampus, Mitochondria β’ Bioblast editor: Kandolf G β’ O2k-Network Lab: CA Winnipeg Fernyhough P
Labels: MiParea: Respiration
Pathology: Alzheimer's
Organism: Mouse Tissue;cell: Nervous system Preparation: Isolated mitochondria
Coupling state: ROUTINE, OXPHOS, ET
Pathway: N, S, ROX
HRR: Oxygraph-2k, O2k-Fluorometer
Labels, 2017-11
