Effect of anaerobic and stationary phase growth conditions on the heat shock and oxidative stress responses in Escherichia coli K-12

2006 ◽  
Vol 185 (6) ◽  
pp. 429-438 ◽  
Author(s):  
Alondra Díaz-Acosta ◽  
María L. Sandoval ◽  
Luis Delgado-Olivares ◽  
Jorge Membrillo-Hernández
Keyword(s):  
Oxidative Stress ◽  
Escherichia Coli ◽  
Heat Shock ◽  
Stationary Phase ◽  
Stress Responses ◽  
Growth Conditions ◽  
Phase Growth ◽  
K 12 ◽  
Oxidative Stress Responses ◽  
And Oxidative Stress

scholarly journals Genome-Wide Transcriptional Responses of Escherichia coli K-12 to Continuous Osmotic and Heat Stresses

2008 ◽  
Vol 190 (10) ◽  
pp. 3712-3720 ◽  
Author(s):  
Thusitha S. Gunasekera ◽  
Laszlo N. Csonka ◽  
Oleg Paliy
Keyword(s):  
Oxidative Stress ◽  
Escherichia Coli ◽  
High Temperature ◽  
Osmotic Stress ◽  
Stress Responses ◽  
Transcriptional Responses ◽  
High Osmolarity ◽  
Genome Wide ◽  
K 12 ◽  
And Oxidative Stress

ABSTRACT Osmotic stress is known to increase the thermotolerance and oxidative-stress resistance of bacteria by a mechanism that is not adequately understood. We probed the cross-regulation of continuous osmotic and heat stress responses by characterizing the effects of external osmolarity (0.3 M versus 0.0 M NaCl) and temperature (43°C versus 30°C) on the transcriptome of Escherichia coli K-12. Our most important discovery was that a number of genes in the SoxRS and OxyR oxidative-stress regulons were up-regulated by high osmolarity, high temperature, or a combination of both stresses. This result can explain the previously noted cross-protection of osmotic stress against oxidative and heat stresses. Most of the genes shown in previous studies to be induced during the early phase of adaptation to hyperosmotic shock were found to be also overexpressed under continuous osmotic stress. However, there was a poorer overlap between the heat shock genes that are induced transiently after high temperature shifts and the genes that we found to be chronically up-regulated at 43°C. Supplementation of the high-osmolarity medium with the osmoprotectant glycine betaine, which reduces the cytoplasmic K+ pool, did not lead to a universal reduction in the expression of osmotically induced genes. This finding does not support the hypothesis that K+ is the central osmoregulatory signal in Enterobacteriaceae.

Repressive effect of Rhus coriaria L. fruit extracts on microglial cells-mediated inflammatory and oxidative stress responses

2021 ◽  
Vol 269 ◽  
pp. 113748
Author(s):  
Mohamad Khalil ◽  
Ali Bazzi ◽  
Dana Zeineddine ◽  
Wissam Jomaa ◽  
Ahmad Daher ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Stress Responses ◽  
Microglial Cells ◽  
Fruit Extracts ◽  
Repressive Effect ◽  
Rhus Coriaria ◽  
Oxidative Stress Responses ◽  
And Oxidative Stress

The ECF sigma factor σTis involved in osmotic and oxidative stress responses in Caulobacter crescentus

2007 ◽  
Vol 66 (5) ◽  
pp. 1240-1255 ◽  
Author(s):  
Cristina E. Alvarez-Martinez ◽  
Rogério F. Lourenço ◽  
Regina L. Baldini ◽  
Michael T. Laub ◽  
Suely L. Gomes
Keyword(s):  
Oxidative Stress ◽  
Stress Responses ◽  
Sigma Factor ◽  
Caulobacter Crescentus ◽  
Ecf Sigma Factor ◽  
Oxidative Stress Responses ◽  
And Oxidative Stress
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