Insulin resistance is a fundamental factor in non-insulin-dependent diabetes. Prolonged activation of the insulin receptor, inflammation, and excessive insulin levels can induce insulin resistance by decreasing levels of insulin receptor substrate (IRS) proteins. However, the mechanism(s) underlying the destruction of IRS proteins and subsequent resistance to insulin have not been well defined. Proteins of the SOCS family have been implicated in the negative regulation of insulin signaling and also regulate cytokine signaling by targeting proteins for degradation by the proteasome. In particular, the function for the SOCS-7 protein was previously unclear.
In a study appearing online on August 25 in advance of print publication of the September 1 issue of the Journal of Clinical Investigation, Paul Rothman and colleagues from the University of Iowa demonstrate that SOCS-7 regulates insulin signaling by associating with several components of the insulin-signaling cascade.
The researchers generate SOCS-7-deficient mice and show that cells lacking SOCS-7 have increased IRS protein levels and prolonged IRS activation. SOCS-7 deficient mice are more insulin sensitive as measured by a glucose tolerance test and an insulin tolerance test. In addition, SOCS-7-deficient mice exhibit increased growth of pancreatic islets with increased fasting insulin levels and hypoglycemia. As one of the only mouse knockout models featuring increased insulin sensitivity, these data suggest that SOCS-7 is a potent regulator of glucose homeostasis and insulin signaling.
Stacie Bloom | EurekAlert!
New application for acoustics helps estimate marine life populations
16.01.2018 | University of California - San Diego
Unexpected environmental source of methane discovered
16.01.2018 | University of Washington Health Sciences/UW Medicine
What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...
For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.
Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...
At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.
No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...
Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.
Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...
The oceans are the largest global heat reservoir. As a result of man-made global warming, the temperature in the global climate system increases; around 90% of...
08.01.2018 | Event News
11.12.2017 | Event News
08.12.2017 | Event News
16.01.2018 | Materials Sciences
16.01.2018 | Materials Sciences
16.01.2018 | Power and Electrical Engineering