Fight Aging! Newsletter, July 15th 2019

In conclusion, we show here that sEVs are responsible for mediating paracrine senescence and speculate that they could be involved in inducing bystander senescence during therapy-induced senescence or aging. In fact, when compared to soluble factors, sEVs have different biophysical and biochemical properties as they have a longer lifespan than do soluble factors and they are more resistant to protease degradation. The idea that blocking sEV secretion could be a potential therapeutic approach to alleviate senescence "spreading" during chemotherapy-induced senescence or in aging tissues presents itself as a very attractive tool for the future. Telomere Dynamics with Age are Very Different Between Mammalian Species https://www.fightaging.org/archives/2019/07/telomere-dynamics-with-age-are-very-different-between-mammalian-species/ Telomeres are caps of repeated DNA sequences at the ends of chromosomes. They shorten with each cell division, a part of the mechanism that ensures somatic cells can only replicate a limited number of times. Telomerase acts to lengthen telomeres, and in humans telomerase is only active in stem cells. Thus our cells exist in a two-tier system, in which only tiny populations of privileged stem cells are permitted unrestricted replication, while the vast majority of somatic cells are limited. Matters are similar across all higher animals, and this state of affairs likely evolved because it keeps cancer to a low enough level, and pushed ...
Source: Fight Aging! - Category: Research Authors: Tags: Newsletters Source Type: blogs