SLEEP DEPRIVATION INTERFERES WITH JAK/STAT SIGNALING PATHWAY AND MYOGENESIS IN MASSETER MUSCLE OF RATS.

jectives. This study evaluated the JAK/STAT signaling pathway and myogenesis on masseter muscle after sleep deprivation as well as to investigate the role of stress in this scenario. Subjetcts and Methods. A total of 18 male Wistar rats were distributed into the following groups: Control (CTRL; n=6): animals were not submitted to any procedures; Sleep Deprivation and Vehicle (PSD+V; n=6): animals were subjected to Paradoxical Sleep Deprivation for 96h and (PSD+MET; n=6): animals were subjected to Paradoxical Sleep Deprivation for 96h with administration of metyrapone. Paradoxal Sleep deprivation was performed by the Modified Multiple Platforms Method. Histopatological analysis, histomorphmetry and immunohistochemistry were performed. Results and Conclusion. The results showed the presence of inflammatory infiltrate in the PSD+V and PSD+MET groups and atrophy. Histomorphometry showed that Cellular Profile Area decreased while Cellular Density increased in both experimental groups. Expression of p-STAT 3, MyoD and MyoG increased in PSD+V group, while the PSD+MET group increased expression of IL-6 and p-STAT 3. Our results are consistent with notion that sleep deprivation induced inflammatory response and atrophy in masseter muscle of rats.