IRE1α and TRB3 do not contribute to the disruption of proximal insulin signaling caused by palmitate in C2C12 myotubes

Cell Biology International
Nicolas PierreMarc Francaux

Abstract

Endoplasmic reticulum (ER) stress is a central actor in the physiopathology of insulin resistance (IR) in various tissues. The subsequent unfolded protein response (UPR) interacts with insulin signaling through inositol-requiring 1α (IRE1α) activation and tribbles homolog 3 (TRB3) expressions. IRE1α impairs insulin actions through the activation of c-Jun N-terminal kinase (JNK), and TRB3 is a pseudokinase inhibiting Akt. In muscle cells, the link between ER stress and IR has only been demonstrated by using chemical ER stress inducers or overexpression techniques. However, the involvement of ER stress in lipid-induced muscle IR remains controversial. The aim of the study is to test whether palmitate-induced IRE1α signaling and TRB3 expression disturb insulin signaling in myogenic cells. C2C12 myotubes were exposed to palmitate and then stimulated with insulin. siRNA transfection was used to downregulate TRB3 and IRE1α. Palmitate increased TRB3 expression, activated IRE1α signaling, and reduced the insulin-dependent Akt phosphorylation. Knocking down TRB3 or IRE1α did not prevent the inhibitory effect of palmitate on Akt phosphorylation. Our results support the idea that ER stress is not responsible for lipid-induced IR in C2C12 ...Continue Reading

References

Oct 16, 2004·Science·Umut OzcanGökhan S Hotamisligil
Nov 21, 2007·Seminars in Cell & Developmental Biology·Jyoti D Malhotra, Randal J Kaufman
Dec 1, 2007·Endocrine Reviews·Décio L EizirikMiriam Cnop
Jul 25, 2008·Nature·Kezhong Zhang, Randal J Kaufman
Sep 30, 2010·American Journal of Physiology. Endocrinology and Metabolism·Larysa YuzefovychLyudmila Rachek
Sep 6, 2011·Trends in Molecular Medicine·Miriam CnopLicio A Velloso
May 23, 2013·Nature Communications·Ho-Jin KohLaurie J Goodyear
Apr 18, 2014·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Ding AnLaurie J Goodyear
Jun 11, 2014·Biochemical and Biophysical Research Communications·Nicolas PierreMarc Francaux

❮ Previous
Next ❯

Citations

Sep 21, 2016·Journal of the Formosan Medical Association = Taiwan Yi Zhi·Wen-Pin ChengKou-Gi Shyu
Sep 7, 2018·Life Sciences·Paulo Henrique CanciglieriJosé Rodrigo Pauli

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.