Uniform TitleBioactives of Artemisia dracunculus L enhance cellular insulin signaling in primary human skeletal muscle culture
NameRibnicky, David M. (author), Cefalu, William T. (author), Raskin, Ilya (author), Wang, Zhong Q. (author), Zhang, Xian H. (author), Yu, Yongmei (author),
SubjectArtemisia dracunculus L,
Human skeletal muscle culture
DescriptionAn alcoholic extract of Artemisia dracunculus L (PMI 5011) has been shown to decrease glucose and improve insulin levels in animal
models, suggesting an ability to enhance insulin sensitivity. We sought to assess the cellular mechanism by which this botanical affects carbohydrate metabolism in primary human skeletal muscle culture. We measured basal and insulin-stimulated glucose uptake, glycogen accumulation, phosphoinositide 3 (PI-3) kinase activity, and Akt phosphorylation in primary skeletal muscle culture from subjects with type 2 diabetes mellitus incubated with or without various concentrations of PMI 5011. We also analyzed the abundance of insulin receptor
signaling proteins, for example, IRS-1, IRS-2, and PI-3 kinase. Glucose uptake was significantly increased in the presence of increasing concentrations of PMI 5011. In addition, glycogen accumulation, observed to be decreased with increasing free fatty acid levels, was partially restored with PMI 5011. PMI 5011 treatment did not appear to significantly affect protein abundance for IRS-1, IRS-2, PI-3
kinase, Akt, insulin receptor, or Glut-4. However, PMI 5011 significantly decreased levels of a specific protein tyrosine phosphatase, that
is, PTP1B. Time course studies confirmed that protein abundance of PTP1B decreases in the presence of PMI 5011. The cellular mechanism of action to explain the effects by which an alcoholic extract of A dracunculus L improves carbohydrate metabolism on a clinical level may be secondary to enhancing insulin receptor signaling and modulating levels of a specific protein tyrosine phosphatase, that is, PTP1B.
NoteMetabolism Clinical and Experimental 57 (Suppl 1) (2008) S58–S64
NoteSupported by NIH Grant P50AT002776-01 from the National Center for Complementary and Alternative Medicine (NCCAM) and the Office of Dietary Supplements (ODS), which funds the Botanical Research Center of Pennington Biomedical Research Center and The Biotech Center of Rutgers University.
NoteNIH P50 AT002776-01; by William Cefalu
NoteThe published version of this article is available at: http://www.metabolismjournal.com/
CollectionRibnicky, David Collection
Organization NameRutgers, The State University of New Jersey
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