We have been studying the requirement for the aryl hydrocarbon receptor nuclear translocator (Arnt)-dependent DNA complex formation, which precedes the activation of gene transcription. Using DEAE chromatography, we have obtained a Sf9 insect fraction F5 that is highly enriched with beta-tubulin. F5 inhibits the formation of the AhR gel shift complex and this inhibition is sensitive to protease, suggesting that proteins that are present in this F5 fraction are responsible for the inhibition. Additional experiments have revealed that this inhibition is less pronounced in the presence of anti-beta-tubulin IgG and beta-tubulin enriched fraction from pig brain also inhibits the AhR gel shift formation. Sf9 beta-tubulin interacts with Arnt and suppresses the binding of the AhR/Arnt heterodimer to its corresponding enhancer. Human beta4-tubulin, which shares high sequence identity with Sf9 beta-tubulin, suppresses the AhR-dependent luciferase expression by reducing the nuclear Arnt content and retaining Arnt in the cytoplasm. Fluorescence studies using the GFP fusion of human beta4-tubulin have revealed that beta4-tubulin prevents the localization of Arnt in Sf9 cells. Here we have provided evidence suggesting that beta-tubulin may regulate the physiological content of Arnt.
Download full-text PDF |
Source |
---|---|
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2823942 | PMC |
http://dx.doi.org/10.1016/j.bcp.2009.12.010 | DOI Listing |
Chin Med
December 2024
Department of Oriental Pharmaceutical Science, College of Pharmacy, Kyung Hee University, Seoul, 02447, Republic of Korea.
Background: Atopic dermatitis (AD) is a chronic multifactorial inflammatory skin disorder with a complex etiology. Despite its increasing prevalence, treatment of AD is still limited. Indole-3-carbinol (I3C) is found in cruciferous vegetables and is formed when these vegetables are cut, chewed, or cooked; it exerts diverse pharmacological activities.
View Article and Find Full Text PDFFront Immunol
December 2024
Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, United States.
Exposure to environmental contaminants can result in profound effects on the host immune system. One class of environmental toxicants, known as dioxins, are persistent environmental contaminants termed "forever chemicals". The archetype toxicant from this group of chemicals is 2, 3, 7, 8-tetrachlorodibenzo-p-dioxin (TCDD), an immunotoxicant that activates the aryl-hydrocarbon receptor pathway leading to a variety of changes in immune cell responses.
View Article and Find Full Text PDFJ Cell Mol Med
December 2024
Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin, USA.
Fibrosis, characterised by excessive extracellular matrix deposition, contributes to both organ failure and significant mortality worldwide. Whereas fibroblasts are activated into myofibroblasts, marked by phenotypic factors such as α-smooth muscle actin (α-SMA), periostin, fibroblast activation protein (FAP) and heat shock protein 47 (HSP47), the cellular processes of trans-differentiation for fibrosis development remain poorly understood. Herein, we hypothesised that the molecular signalling of geranylgeranyl pyrophosphate (GGPP), a crucial biochemical molecule for protein prenylation, is essential in the regulation of profibrotic mechanisms for fibroblast-to-myofibroblast activation.
View Article and Find Full Text PDFJ Physiol Biochem
December 2024
Department of Exercise Physiology, Faculty of Sport Sciences, Shahid Rajaee Teacher Training University, Tehran, Iran.
The circadian clock regulates mitochondrial function and affects time-dependent metabolic responses to exercise. The present study aimed to determine the effects of aerobic exercise timing at the light-dark phase on the proteins expression of the circadian clock, mitochondrial dynamics, and, NAD-SIRT1-PPARα axis in skeletal muscle of high-fat diet-induced diabetic mice. In this experimental study, thirty male mice were randomly assigned into two groups based on time: the early light phase, ZT3, and the early dark phase, ZT15, and three groups at each time: (1) Healthy Control (HC), (2) Diabetic Control (DC), and (3) Diabetic + Exercise (DE).
View Article and Find Full Text PDFWorld J Exp Med
December 2024
Department of Biochemistry, School of Medicine, College of Medicine, China Medical University, Taichung City 404328, Taiwan.
This editorial discusses the insightful minireview by Rahmati . The minireview delves into the role of the aryl hydrocarbon receptor in the development and progression of esophageal squamous cell carcinoma, highlighting its potential as a promising therapeutic target. The authors concisely summarize the current understanding of how aryl hydrocarbon receptor modulation influences immune responses and the tumor microenvironment, offering fresh perspectives on therapeutic strategies.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!