IL-6 deficiency attenuates p53 protein accumulation in aged male  mouse hippocampus.

IL-6 deficiency attenuates p53 protein accumulation in aged male mouse hippocampus.
Biogerontology. 2019 Oct 09;:
Authors: Bialuk I, Cieślińska M, Kowalczuk O, Bonda TA, Nikliński J, Winnicka MM
Abstract
Our earlier studies demonstrated slower age-related memory decline in IL-6-deficient than in control mice. Therefore, in the present study we evaluated the effect of IL-6 deficiency and aging on expression of p53, connected with accumulation of age-related cellular damages, in hippocampus of 4- and 24-month-old IL-6-deficient C57BL/6J (IL-6KO) and wild type control (WT) mice. The accumulation of p53 protein in hippocampus of aged IL-6KO mice was significantly lower than in aged WT ones, while p53 mRNA level was significantly higher in IL-6-deficient mice, what indicates that the effect was independent on p53 transcription. Presence of few apoptotic cells in hippocampal dentate gyrus and lack of changes in levels of pro-apoptotic Bax, antiapoptotic Bcl-2, as well as in p21 protein in aged animals of both genotypes, points to low transcriptional activity of p53, especially in aged WT mice. Because the amount of p53 protein did not correlate with the level of Mdm2 protein, its main negative regulator, other than Mdm2-dependent mechanism was involved in p53 build-up. Significantly higher mRNA levels of autophagy-associated genes: Pten, Tsc2, and Dram1 in IL-6KO mice, in conjunction with significantly lower amount of Bcl-2 protein in ...

Source: Biogerontology - October 8, 2019 Category: Geriatrics Authors: Bialuk I, Cieślińska M, Kowalczuk O, Bonda TA, Nikliński J, Winnicka MM Tags: Biogerontology Source Type: research