Short-term hypoxia increases phosphorylated tyrosine hydroxylase at Ser31 and Ser40 in rat carotid body

► Phosphorylation levels of TH were examined in rat CB during short-term hypoxia. ► Six hours after hypoxia, phosphorylated TH at Ser31 was increased in glomus cells. ► Phosphorylated TH at Ser40 was also increased in glomus cells, similar to Ser31. ► Under short-term hypoxia, activated TH would increase catecholamine in glomus cells.