Regional Distribution and Production Rate of 3‐Methoxy‐4‐Hydroxyphenylethyleneglycol Sulphate (MHPG‐SO4) in Rat Brain

Abstract
The levels of noradrenaline (NA) and 3-methoxy-4-hydroxyphen-ylethyleneglycol sulphate (MHPG-SO4) in 15 brain regions showed a parallel distribution in male Wistar rats. The differences in regional distribution of MHPG-SO4 were similar to those in the rate of NA turnover reported by other investigators. The accumulation rates of MHPG-SO4 during 45 and 90 min after probenecid injection significantly correlated to the steady state levels of MHPG-SO4 in nine regions studied. With the results, the regional levels of MHPG-SO, either in untreated or in probenecid-treated rats, are considered to be a useful index of NA turnover.