What question did this study set out to answer?

The study aims to isolate and characterize renin and angiotensin activity in canine and rat brain extracts.

Angiotensin and Renin in Rat and Dog Brain

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Population

Nephrectomized dogs and rats (brain extracts)

Design

Preclinical

Authors

Does not inform clinical practice; leaves open a functional brain renin-angiotensin system in mammals.

The study aims to isolate and characterize renin and angiotensin activity in canine and rat brain extracts.
Isolated enzyme from brain extracts of nephrectomized dogs.
Conducted chemical and pharmacological tests to identify pressor substances.
Used countercurrent distribution to assess pressor activity contributions from angiotensins I and II.
Isolated enzyme exhibited thermolability and nondialyzability.
38% of pressor activity in brain extracts correlated with angiotensin II.
Observed correlation between angiotensin and norepinephrine concentrations in various dog brain regions.

Population

Nephrectomized dogs and rats (brain extracts)

Intervention

Isolation and characterization of renin and angiotensin from brain extracts

Outcome

Presence and characteristics of renin and angiotensin in brain extractssurrogate

The study demonstrates the presence of renin and angiotensin in the brains of dogs and rats, suggesting a local brain renin-angiotensin system.

Fischer-Ferraro et al. (1971) studied this question.

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