| First Author | Nagy JA | Year | 2022 |
| Journal | Sci Rep | Volume | 12 |
| Issue | 1 | Pages | 5327 |
| PubMed ID | 35351934 | Mgi Jnum | J:322807 |
| Mgi Id | MGI:7259534 | Doi | 10.1038/s41598-022-09328-0 |
| Citation | Nagy JA, et al. (2022) Altered electrical properties in skeletal muscle of mice with glycogen storage disease type II. Sci Rep 12(1):5327 |
| abstractText | Electrical impedance methods, including electrical impedance myography, are increasingly being used as biomarkers of muscle health since they measure passive electrical properties of muscle that alter in disease. One disorder, Pompe Disease (Glycogen storage disease type II (GSDII)), remains relatively unstudied. This disease is marked by dramatic accumulation of intracellular myofiber glycogen. Here we assessed the electrical properties of skeletal muscle in a model of GSDII, the Pompe(6neo/6neo) (Pompe) mouse. Ex vivo impedance measurements of gastrocnemius (GA) were obtained using a dielectric measuring cell in 30-week-old female Pompe (N = 10) and WT (N = 10) mice. Longitudinal and transverse conductivity, sigma, and the relative permittivity, epsilonr, and Cole-Cole complex resistivity parameters at 0 Hz and infinite frequency, rhoo and rhoinfinity, respectively, and the intracellular resistivity, rhointracellular were determined from the impedance data. Glycogen content (GC) was visualized histologically and quantified biochemically. At frequencies > 1 MHz, Pompe mice demonstrated significantly decreased longitudinal and transverse conductivity, increased Cole-Cole parameters, rhoo and rhoo-rhoinfinity, and decreased rhointracellular. Changes in longitudinal conductivity and rhointracellular correlated with increased GC in Pompe animals. Ex vivo high frequency impedance measures are sensitive to alterations in intracellular myofiber features considered characteristic of GSDII, making them potentially useful measures of disease status. |
