Quantitative LC-MSMS of human muscle cells after electrical pulse stimulation

We hypothesized that muscle contraction produces a cellular stress signal capable to increase lipolysis to sustain fuel availability during exercise. The aim of the present study was to identify novel exercise-regulated myokines, aka exerkines, able to promote lipolysis in human adipocytes. To this end, human primary myotubes from lean healthy volunteers were submitted to electrical pulse stimulation to mimic either acute intense or chronic moderate exercise. Conditioned media experiments with hMADS adipocytes were performed. Unbiased proteomic and ELISA analyses were applied in conditioned media and human plasma samples. Real-time qPCR was performed in cultured myotubes and muscle biopsy samples.