Abstract
We examined the regional distributions of atrial natriuretic polypeptide (ANP) and digoxin-like immunoreactivity (DLI) in dog brain, using specific radioimmunoassay. The molecular form of the dog brain ANP was similar to that of alpha-hANP, in gel filtration and reversed-phase HPLC. Distribution of ANP in dog brain differed from rat brain. A significant amount of ANP-like immunoreactivity (ANPLI) was observed in the periaqueductal grey, ventral thalamus and spinal cord, however, only a trace amount was seen in the hypothalamus. The DLI was widely distributed in the dog brain, especially with over 2 ng/g wet wt. of the immunoreactivity content in mammillary body, septum, striatal body, hypothalamus and periaqueductal grey. Different from the localizations of natriuretic hormones in rat brain, the periaqueductal grey matter in dog brain may be an important source of both natriuretic hormones.
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