Pulsed ultrasound and dimethylsulfoxide gel treatment reduces the expression of pro-inflammatory molecules in an animal model of muscle injury.

Studies have shown an exacerbated increase in proinflammatory markers during and after muscle injury. In this way, interventions that reduce inflammatory activation appear to be of great interest in muscle injury therapy. Thus, the preset study evaluated the effect of low-intensity pulsed ultrasound (LIPUS) and dimethylsulfoxide (DMSO) on the proinflammatory molecules in an animal model of traumatic muscle injury. Forty-eight 3-month old male Wistar rats were divided into six groups (n = 8/group): sham; muscle injury without treatment; muscle injury and gel-saline (0.9%); muscle injury and gel-DMSO (15 mg/kg); muscle injury and LIPUS plus gel-saline; and muscle injury and LIPUS plus gel-DMSO. Two, 12, 24 and 48 h after trauma, four groups received one of the treatments described. One hour after, Western blot was performed to quantify proinflammatory protein levels. We observed greater protein levels of TNFα (3.9 times), IL-1β (3.6 times), JNK phosphorylation (4.2 times) and NFκB (3.8 times) in muscle injury group. However, the combined LIPUS with DMSO resulted in significantly lower levels of TNFα (2.2 times), IL-1β (2.1 times), JNK phosphorylation (2.4 times), and NFκB (2.1 times). The results demonstrate that LIPUS associated with DMSO gel can attenuate TNFα, IL-1β, NFκB protein levels and JNK phosphorylation in traumatic muscle injury.