https://www.selleckchem.com/products/FK-506-(Tacrolimus).html Moreover, the degree of membrane potential repolarization in the dark is correlated with the latency and velocity of iridal constriction. Furthermore, pupil escape is driven by membrane potential hyperpolarization where voltage-gated potassium channels play a crucial role. Together, this study presents new mechanisms regulating synchronized pupil dilation and contraction, sustained pupil constriction, iridal stimulation-contraction coupling, and pupil escape. Together, this study presents new mechanisms regulating synchronized pupil dilation and contraction, sustained pupil constriction, iridal stimulation-contraction coupling, and pupil escape. Glucocorticoid-induced myopathy is a characteristic symptom of endogenous Cushing's syndrome (CS). Its long-term outcome is largely unknown. To evaluate long-term muscle function following the remission of endogenous CS. Observational longitudinal cohort study. Tertiary care hospitals and a specialized outpatient clinic. As part of the prospective multicenter German Cushing's Registry, we assessed muscle strength in patients with overt endogenous CS. We studied the patients at the time of diagnosis (n = 88), after 6 months (n = 69), and thereafter annually, following surgical remission over a period of up to 4 years (1 year n = 55; 2 years n = 34; 3 years n = 29; 4 years n = 22). Muscle function was evaluated by hand grip strength and by chair rising test. Grip strength was decreased to 83% of normal controls (100%) at the time of diagnosis. It further decreased to 71% after 6 months in remission (P ≤ 0.001) and showed no improvement during further follow-up compared with baseline. Chair rising test performance improved initially (8 seconds at baseline vs 7 seconds after 6 months, P = 0.004) but remained at this reduced level thereafter (7 seconds after 3 years vs 5 seconds in controls, P = 0.038). In multivariate analysis, we identified, as predictors for long-te