4.6 Article

STAT3 deletion sensitizes cells to oxidative stress

Journal

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2009.05.051

Keywords

STAT1; STAT3; Apoptosis; Ischemia; Myocardial infarction; Oxidative stress

Funding

  1. British Heart Foundation, London, UK

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The transcription factor STAT1 plays a role in promoting apoptotic cell death, whereas the related STAT3 transcription factor protects cardiac myocytes from ischemia/reperfusion (I/R) injury or oxidative stress. Cytokines belonging to the IL-6 family activate the JAK-STAT3 pathway, but also activate other cytoprotective pathways such as the MAPK-ERK or the PI3-AKT pathway. It is therefore unclear whether STAT3 is the only cytoprotective mediator against oxidative stress-induced cell death. Overexpression of STAT3 in primary neonatal rat ventricular myocytes (NRVM) protects against I/R-induced cell death. Moreover, a dominant negative STAT3 adenovirus (Ad ST3-DN) enhanced apoptotic cell death (81.2 +/- 6.9%) compared to control infected NRVM (46.0 +/- 3.1%) following I/R. Depletion of STAT3 sensitized cells to apoptotic cell death following oxidative stress. These results provide direct evidence for the role of STAT3 as a cytoprotective transcription factor in cells exposed to oxidative stress. (C) 2009 Elsevier Inc. All rights reserved.

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Ke Shi, Yunlong Shan, Xiao Sun, Kuida Chen, Qiong Luo, Qiang Xu

Summary: This study found that low expression of TP53INP2 is associated with poor survival in colorectal cancer (CRC) patients. As the malignancy of CRC progresses, TP53INP2 expression gradually decreases. Knockdown of TP53INP2 promotes CRC cell proliferation and tumor growth. Mechanistically, TP53INP2 deficiency decreases phosphorylation of beta-catenin, leading to increased accumulation and enhanced nuclear translocation and transcriptional activity. Additionally, TP53INP2 sequesters TIM50, inhibiting its activation of beta-catenin. In conclusion, downregulation of TP53INP2 promotes CRC progression by activating beta-catenin.

BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS (2024)

Article Biochemistry & Molecular Biology

The four subunits of rabbit skeletal muscle lactate dehydrogenase do not exert their catalytic action additively

Martina Rossi, Fabio Tomaselli, Alejandro Hochkoeppler

Summary: Oligomeric enzymes are known for their higher catalytic rates compared to monomeric enzymes, but the extent of additivity in their activity is still not well understood. This study used tetrameric rabbit lactate dehydrogenase as a model to examine the kinetics of its catalytic action. Surprisingly, when the concentration of the limiting reactant exceeded that of a single subunit, there was a significant slowdown in the enzyme's conformational rearrangements.

BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS (2024)

Article Biochemistry & Molecular Biology

Interaction of gallium, indium, and vanadyl curcumin complexes with hen egg-white lysozyme (HEWL): Mechanistic aspects and evaluation of antiamyloidogenic activity

Amin Sahraei, Mohammad Javad Shamsoddini, Fakhrossadat Mohammadi, Leila Hassani

Summary: This study explored the inhibitory effects of gallium curcumin, indium curcumin, and vanadyl curcumin on the amyloid fibrillation of hen egg white lysozyme, as well as the binding interactions of these metal complexes with the enzyme. The results showed that indium curcumin and vanadyl curcumin exhibited higher binding affinities and stronger inhibitory effects on amyloid fibrillation compared to gallium curcumin.

BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS (2024)

Article Biochemistry & Molecular Biology

Progranulin-deficient macrophages cause cardiotoxicity under hypoxic conditions

Takahiro Sasaki, Yoshiki Kuse, Shinsuke Nakamura, Masamitsu Shimazawa

Summary: PGRN deficiency plays a significant role in cardiac remodeling and arrhythmias post-myocardial infarction (MI), potentially by promoting metabolic abnormalities in macrophages.

BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS (2024)

Article Biochemistry & Molecular Biology

Changes in myelinated nerve fibers induced by pulsed electrical stimulation: A microstructural perspective on the causes of electrical stimulation side effects

Hongwei Zhao, Yiqiang Li, Yibo Zhang, Chi Zhang

Summary: Electrical brain stimulation technology is commonly used to treat brain neurological disorders, but it can cause side effects. This study investigated the impact of electric fields on nerve fibers and revealed the possible origin of side effects. The findings provide guidance for selecting electrical parameters in clinical stimulation therapy.

BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS (2024)

Article Biochemistry & Molecular Biology

Fatty acid elongation regulates mitochondrial 13-oxidation and cell viability in prostate cancer by controlling malonyl-CoA levels

Julia S. Scott, Lake-Ee Quek, Andrew J. Hoy, Johannes V. Swinnen, Zeyad D. Nassar, Lisa M. Butler

Summary: The fatty acid elongation enzyme ELOVL5 plays a critical role in promoting metastasis in prostate cancer. Knocking down ELOVL5 leads to the accumulation of malonyl-CoA, which inhibits fatty acid oxidation in mitochondria. This study highlights the importance of fatty acid elongation in regulating cell viability and provides a potential target for prostate cancer treatment.

BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS (2024)

Article Biochemistry & Molecular Biology

The effects of noise exposure on hippocampal cognition in C57BL/6 mice via transcriptomics

Zan Zhou, Wen-jun Jiang, Li Li, Jun-qiang Si

Summary: This study investigates the effect of noise exposure on cognitive function in mice and explores the underlying molecular mechanisms. The findings suggest that noise exposure leads to increased inflammation, increased phosphorylation of Tau protein, and decreased levels of postsynaptic density protein, resulting in cognitive impairment.

BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS (2024)