Skip to Content
MilliporeSigma

Tau affects P53 function and cell fate during the DNA damage response.

Communications biology (2020-05-20)
Martina Sola, Claudia Magrin, Giona Pedrioli, Sandra Pinton, Agnese Salvadè, Stéphanie Papin, Paolo Paganetti
ABSTRACT

Cells are constantly exposed to DNA damaging insults. To protect the organism, cells developed a complex molecular response coordinated by P53, the master regulator of DNA repair, cell division and cell fate. DNA damage accumulation and abnormal cell fate decision may represent a pathomechanism shared by aging-associated disorders such as cancer and neurodegeneration. Here, we examined this hypothesis in the context of tauopathies, a neurodegenerative disorder group characterized by Tau protein deposition. For this, the response to an acute DNA damage was studied in neuroblastoma cells with depleted Tau, as a model of loss-of-function. Under these conditions, altered P53 stability and activity result in reduced cell death and increased cell senescence. This newly discovered function of Tau involves abnormal modification of P53 and its E3 ubiquitin ligase MDM2. Considering the medical need with vast social implications caused by neurodegeneration and cancer, our study may reform our approach to disease-modifying therapies.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Cycloheximide, ≥90% (HPLC)
Sigma-Aldrich
Puromycin dihydrochloride from Streptomyces alboniger, powder, BioReagent, suitable for cell culture
Sigma-Aldrich
SIGMAFAST Protease Inhibitor Tablets, For General Use
Sigma-Aldrich
Nutlin-3, ≥98% (HPLC), powder
Sigma-Aldrich
KU-55933, ≥98% (HPLC)
Sigma-Aldrich
Magnesium chloride, anhydrous, ≥98%
Sigma-Aldrich
Poly-D-lysine hydrobromide, mol wt 70,000-150,000, lyophilized powder, γ-irradiated, BioReagent, suitable for cell culture
Sigma-Aldrich
5-Bromo-4-chloro-3-indolyl β-D-galactopyranoside, ≥98%, powder
Sigma-Aldrich
DAPI, for nucleic acid staining
Sigma-Aldrich
MG-132, Ready Made Solution, ≥90% (HPLC)
Sigma-Aldrich
Potassium hexacyanoferrate(II) trihydrate, ACS reagent, 98.5-102.0%
Sigma-Aldrich
Potassium hexacyanoferrate(III), ReagentPlus®, ~99%
Sigma-Aldrich
RIPA Buffer