Reduced dynamin-related protein 1 protects against phosphorylated Tau-induced mitochondrial dysfunction and synaptic damage in Alzheimer's disease

Ramesh Kandimalla, Maria Manczak, David Fry, Yeguvapalli Suneetha, Hiromi Sesaki, P (Hemachandra) Reddy

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

The purpose of our study was to understand the protective effects of a partial reduction of dynamin-related protein 1 (Drp1) in Alzheimer's disease (AD) progression and pathogenesis. Increasing evidence suggests that phosphorylated Tau and mitochondrial abnormalities are involved in the loss of synapses, defective axonal transport and cognitive decline, in patients with AD. In the current study, we investigated whether a partial reduction of Drp1 protect neurons from phosphorylated Tauinduced mitochondrial and synaptic toxicities in AD progression. We crossed Drp1+/- mice with Tau transgenic mice (P301L line) and created double mutant (TauXDrp1+/-) mice. Using real-time RT-PCR, immunoblotting and immunostaining analyses, we measured mRNA expressions and protein levels of genes related to the mitochondrial dynamics-Drp1 and Fis1 (fission), Mfn1, Mfn2 and Opa1 (fusion), CypD (matrix), mitochondrial biogenesis-Nrf1, Nrf2, PGC1α and TFAM and synaptic- synaptophysin, PSD95, synapsin 1, synaptobrevin 1, neurogranin, GAP43 and synaptopodin in brain tissues from 6-monthold Drp1+/-, Tau, TauXDrp1+/- and wild-type mice. Using biochemical and immunoblotting methods, mitochondrial function and phosphorylated Tau were measured. Decreased mRNA and protein levels of fission and matrix and increased levels of fusion, mitochondrial biogenesis, and synaptic genes were found in 6-month-old TauXDrp1+/- mice relative to Tau mice. Mitochondrial dysfunction was reduced in TauXDrp1+/- mice relative to Tau mice. Phosphorylated Tau found to be reduced in TauXDrp1+/- mice relative to Tau mice. These findings suggest that a partial reduction of Drp1 decreases the production of phosphorylated Tau, reduces mitochondrial dysfunction, and maintains mitochondrial dynamics, enhances mitochondrial biogenesis and synaptic activity in Tau mice. Findings of this study may have implications for the development of Drp1 based therapeutics for patients with AD and other tauopathies.

Original languageEnglish (US)
Pages (from-to)4881-4897
Number of pages17
JournalHuman Molecular Genetics
Volume25
Issue number22
DOIs
StatePublished - Nov 15 2016
Externally publishedYes

Fingerprint

Dynamins
Alzheimer Disease
Proteins
Organelle Biogenesis
Mitochondrial Dynamics
Immunoblotting
Vesicle-Associated Membrane Protein 1
Disease Progression
Neurogranin
Tauopathies
Synapsins
tau Proteins
Messenger RNA
Synaptophysin
Axonal Transport
Synapses
Transgenic Mice
Real-Time Polymerase Chain Reaction
Neurons

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Genetics(clinical)

Cite this

Reduced dynamin-related protein 1 protects against phosphorylated Tau-induced mitochondrial dysfunction and synaptic damage in Alzheimer's disease. / Kandimalla, Ramesh; Manczak, Maria; Fry, David; Suneetha, Yeguvapalli; Sesaki, Hiromi; Reddy, P (Hemachandra).

In: Human Molecular Genetics, Vol. 25, No. 22, 15.11.2016, p. 4881-4897.

Research output: Contribution to journalArticle

Kandimalla, Ramesh ; Manczak, Maria ; Fry, David ; Suneetha, Yeguvapalli ; Sesaki, Hiromi ; Reddy, P (Hemachandra). / Reduced dynamin-related protein 1 protects against phosphorylated Tau-induced mitochondrial dysfunction and synaptic damage in Alzheimer's disease. In: Human Molecular Genetics. 2016 ; Vol. 25, No. 22. pp. 4881-4897.
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