scholarly journals Pharmacological inhibition of dynamin‐related protein 1 attenuates skeletal muscle insulin resistance in obesity

2021 ◽  
Vol 9 (7) ◽  
Author(s):  
Benjamin A. Kugler ◽  
Wenqian Deng ◽  
Abigail L. Duguay ◽  
Jessica P. Garcia ◽  
Meaghan C. Anderson ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Skeletal Muscle ◽  
Related Protein ◽  
Muscle Insulin Resistance ◽  
Pharmacological Inhibition ◽  
Skeletal Muscle Insulin Resistance

scholarly journals Feeding Rhythm-Induced Hypothalamic Agouti-Related Protein Elevation via Glucocorticoids Leads to Insulin Resistance in Skeletal Muscle

2021 ◽  
Vol 22 (19) ◽  
pp. 10831
Author(s):  
Tetsuya Shiuchi ◽  
Airi Otsuka ◽  
Noriyuki Shimizu ◽  
Sachiko Chikahisa ◽  
Hiroyoshi Séi
Keyword(s):  
Insulin Resistance ◽  
Skeletal Muscle ◽  
Insulin Sensitivity ◽  
Glucocorticoid Receptor ◽  
Related Protein ◽  
Muscle Insulin Resistance ◽  
Circadian Phase ◽  
Skeletal Muscle Insulin Resistance ◽  
Feeding Rhythm ◽  
Agouti Related Protein

Circadian phase shifts in peripheral clocks induced by changes in feeding rhythm often result in insulin resistance. However, whether the hypothalamic control system for energy metabolism is involved in the feeding rhythm-related development of insulin resistance is unknown. Here, we show the physiological significance and mechanism of the involvement of the agouti-related protein (AgRP) in evening feeding-associated alterations in insulin sensitivity. Evening feeding during the active dark period increased hypothalamic AgRP expression and skeletal muscle insulin resistance in mice. Inhibiting AgRP expression by administering an antisense oligo or a glucocorticoid receptor antagonist mitigated these effects. AgRP-producing neuron-specific glucocorticoid receptor-knockout (AgRP-GR-KO) mice had normal skeletal muscle insulin sensitivity even under evening feeding schedules. Hepatic vagotomy enhanced AgRP expression in the hypothalamus even during ad-lib feeding in wild-type mice but not in AgRP-GR-KO mice. The findings of this study indicate that feeding in the late active period may affect hypothalamic AgRP expression via glucocorticoids and induce skeletal muscle insulin resistance.

scholarly journals NF-κB-Inducing Kinase (NIK) Mediates Skeletal Muscle Insulin Resistance: Blockade by Adiponectin

Endocrinology ◽  
2011 ◽  
Vol 152 (10) ◽  
pp. 3622-3627 ◽  
Author(s):  
Sanjeev Choudhary ◽  
Sandeep Sinha ◽  
Yanhua Zhao ◽  
Srijita Banerjee ◽  
Padma Sathyanarayana ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Skeletal Muscle ◽  
Glucose Uptake ◽  
Kinase Activity ◽  
Pi3 Kinase ◽  
Dominant Negative ◽  
Muscle Insulin Resistance ◽  
Akt Phosphorylation ◽  
Skeletal Muscle Insulin Resistance ◽  
Obese Subjects

Enhanced levels of nuclear factor (NF)-κB-inducing kinase (NIK), an upstream kinase in the NF-κB pathway, have been implicated in the pathogenesis of chronic inflammation in diabetes. We investigated whether increased levels of NIK could induce skeletal muscle insulin resistance. Six obese subjects with metabolic syndrome underwent skeletal muscle biopsies before and six months after gastric bypass surgery to quantitate NIK protein levels. L6 skeletal myotubes, transfected with NIK wild-type or NIK kinase-dead dominant negative plasmids, were treated with insulin alone or with adiponectin and insulin. Effects of NIK overexpression on insulin-stimulated glucose uptake were estimated using tritiated 2-deoxyglucose uptake. NF-κB activation (EMSA), phosphatidylinositol 3 (PI3) kinase activity, and phosphorylation of inhibitor κB kinase β and serine-threonine kinase (Akt) were measured. After weight loss, skeletal muscle NIK protein was significantly reduced in association with increased plasma adiponectin and enhanced AMP kinase phosphorylation and insulin sensitivity in obese subjects. Enhanced NIK expression in cultured L6 myotubes induced a dose-dependent decrease in insulin-stimulated glucose uptake. The decrease in insulin-stimulated glucose uptake was associated with a significant decrease in PI3 kinase activity and protein kinase B/Akt phosphorylation. Overexpression of NIK kinase-dead dominant negative did not affect insulin-stimulated glucose uptake. Adiponectin treatment inhibited NIK-induced NF-κB activation and restored insulin sensitivity by restoring PI3 kinase activation and subsequent Akt phosphorylation. These results indicate that NIK induces insulin resistance and further indicate that adiponectin exerts its insulin-sensitizing effect by suppressing NIK-induced skeletal muscle inflammation. These observations suggest that NIK could be an important therapeutic target for the treatment of insulin resistance associated with inflammation in obesity and type 2 diabetes.

Lowered extracellular pH is involved in the pathogenesis of skeletal muscle insulin resistance

2014 ◽  
Vol 445 (1) ◽  
pp. 170-174 ◽  
Author(s):  
Hiroki Hayata ◽  
Hiroaki Miyazaki ◽  
Naomi Niisato ◽  
Noriko Yokoyama ◽  
Yoshinori Marunaka
Keyword(s):  
Insulin Resistance ◽  
Skeletal Muscle ◽  
Extracellular Ph ◽  
Muscle Insulin Resistance ◽  
Skeletal Muscle Insulin Resistance

Reversal of chronic alterations of skeletal muscle protein kinase C from fat-fed rats by BRL-49653

1997 ◽  
Vol 273 (5) ◽  
pp. E915-E921 ◽  
Author(s):  
Carsten Schmitz-Peiffer ◽  
Nicholas D. Oakes ◽  
Carol L. Browne ◽  
Edward W. Kraegen ◽  
Trevor J. Biden
Keyword(s):  
Insulin Resistance ◽  
Skeletal Muscle ◽  
Protein Kinase C ◽  
Protein Kinase ◽  
Muscle Protein ◽  
Skeletal Muscle Protein ◽  
Insulin Sensitizer ◽  
Muscle Insulin Resistance ◽  
Skeletal Muscle Insulin Resistance ◽  
Kinase C

We have recently shown that the reduction in insulin sensitivity of rats fed a high-fat diet is associated with the translocation of the novel protein kinase Cε(nPKCε) from cytosolic to particulate fractions in red skeletal muscle and also the downregulation of cytosolic nPKCθ. Here we have further investigated the link between insulin resistance and PKC by assessing the effects of the thiazolidinedione insulin-sensitizer BRL-49653 on PKC isoenzymes in muscle. BRL-49653 increased the recovery of nPKC isoenzymes in cytosolic fractions of red muscle from fat-fed rats, reducing their apparent activation and/or downregulation, whereas PKC in control rats was unaffected. Because BRL-49653 also improves insulin-stimulated glucose uptake in fat-fed rats and reduces muscle lipid storage, especially diglyceride content, these results strengthen the association between lipid availability, nPKC activation, and skeletal muscle insulin resistance and support the hypothesis that chronic activation of nPKC isoenzymes is involved in the generation of muscle insulin resistance in fat-fed rats.

Prevention of skeletal muscle insulin resistance by dietary cod protein in high fat-fed rats

2001 ◽  
Vol 281 (1) ◽  
pp. E62-E71 ◽  
Author(s):  
Charles Lavigne ◽  
Frédéric Tremblay ◽  
Geneviève Asselin ◽  
Hélène Jacques ◽  
André Marette
Keyword(s):  
Insulin Resistance ◽  
Skeletal Muscle ◽  
Amino Acids ◽  
Glucose Uptake ◽  
Soy Protein ◽  
Whole Body ◽  
Glucose Disposal ◽  
High Fat ◽  
Muscle Insulin Resistance ◽  
Skeletal Muscle Insulin Resistance

In the present study, we tested the hypothesis that fish protein may represent a key constituent of fish with glucoregulatory activity. Three groups of rats were fed a high-fat diet in which the protein source was casein, fish (cod) protein, or soy protein; these groups were compared with a group of chow-fed controls. High-fat feeding led to severe whole body and skeletal muscle insulin resistance in casein- or soy protein-fed rats, as assessed by the euglycemic clamp technique coupled with measurements of 2-deoxy-d-[3H]glucose uptake rates by individual tissues. However, feeding cod protein fully prevented the development of insulin resistance in high fat-fed rats. These animals exhibited higher rates of insulin-mediated muscle glucose disposal that were comparable to those of chow-fed rats. The beneficial effects of cod protein occurred without any reductions in body weight gain, adipose tissue accretion, or expression of tumor necrosis factor-α in fat and muscle. Moreover, L6 myocytes exposed to cod protein-derived amino acids showed greater rates of insulin-stimulated glucose uptake compared with cells incubated with casein- or soy protein-derived amino acids. These data demonstrate that feeding cod protein prevents obesity-induced muscle insulin resistance in high fat-fed obese rats at least in part through a direct action of amino acids on insulin-stimulated glucose uptake in skeletal muscle cells.

Sign in / Sign up

Export Citation Format

Share Document