Clear Search sequence regions


  • brain (2)
  • cognitive (2)
  • factor (3)
  • feedback (3)
  • female (1)
  • humans (1)
  • IDH3b (1)
  • impaired (3)
  • mice (4)
  • patients (1)
  • PAX6 (8)
  • pax6 protein (2)
  • protein human (2)
  • synapse (1)
  • Sizes of these terms reflect their relevance to your search.

    Impaired brain glucose metabolism is an early indicator of Alzheimer's disease (AD); however, the fundamental mechanism is unknown. In this study, we found a substantial decline in isocitrate dehydrogenase 3β (IDH3β) levels, a critical tricarboxylic acid cycle enzyme, in AD patients and AD-transgenic mice's brains. Further investigations demonstrated that the knockdown of IDH3β induced oxidation-phosphorylation uncoupling, leading to reduced energy metabolism and lactate accumulation. The resulting increased lactate, a source of lactyl, was found to promote histone lactylation, thereby enhancing the expression of paired-box gene 6 (PAX6). As an inhibitory transcription factor of IDH3β, the elevated PAX6 in turn inhibited the expression of IDH3β, leading to tau hyperphosphorylation, synapse impairment, and learning and memory deficits resembling those seen in AD. In AD-transgenic mice, upregulating IDH3β and downregulating PAX6 were found to improve cognitive functioning and reverse AD-like pathologies. Collectively, our data suggest that impaired oxidative phosphorylation accelerates AD progression via a positive feedback inhibition loop of IDH3β-lactate-PAX6-IDH3β. Breaking this loop by upregulating IDH3β or downregulating PAX6 attenuates AD neurodegeneration and cognitive impairments. © 2024. The Author(s).

    Citation

    Xin Wang, Qian Liu, Hai-Tao Yu, Jia-Zhao Xie, Jun-Ning Zhao, Zhi-Ting Fang, Min Qu, Yao Zhang, Ying Yang, Jian-Zhi Wang. A positive feedback inhibition of isocitrate dehydrogenase 3β on paired-box gene 6 promotes Alzheimer-like pathology. Signal transduction and targeted therapy. 2024 Apr 29;9(1):105

    Expand section icon Mesh Tags

    Expand section icon Substances


    PMID: 38679634

    View Full Text