What question did this study set out to answer?

To isolate, chemically characterize, and evaluate the physiological pressor and vasoconstrictive properties of the substance produced by reacting renin with renin-activator.

January 1, 1940The Journal of Experimental MedicineOpen Access

A Crystalline Pressor Substance (Angiotonin) Resulting From the Reaction Between Renin and Renin-Activator

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To isolate, chemically characterize, and evaluate the physiological pressor and vasoconstrictive properties of the substance produced by reacting renin with renin-activator.
Incubated renin with renin-activator across varying ratios, temperatures (~38°C), and incubation times (10–20 minutes) to isolate the pressor product.
Evaluated hemodynamic responses after intravenous injection in vivo and measured smooth muscle contractions in isolated rabbit intestinal segments and perfused rabbit ears.
Angiotonin was characterized as a heat-stable, water- and alcohol-soluble reducing substance testing strongly positive for arginine and forming crystalline salts with oxalic and picric acids.
Intravenous administration triggered an immediate, sharp increase in arterial pressure unaffected by cocaine, atropine, stilbestrol, or suprarenalectomy, with tachyphylaxis occurring only after repeated doses.
Angiotonin induced marked contractions in isolated rabbit intestine and direct vasoconstriction in rabbit ears perfused with blood or Ringer's solution.

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Implication

Laboratory study reveals angiotonin formation from renin and renin-activator, demonstrating immediate pressor and vasoconstrictive effects indicating a distinct mechanism of vascular regulation.

Cite This Study

Page et al. (1940) studied this question.

synapsesocial.com/papers/6a16b4c64f6063e06b050d01 https://doi.org/10.1084/jem.71.1.29

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Implication

Laboratory study reveals angiotonin formation from renin and renin-activator, demonstrating immediate pressor and vasoconstrictive effects indicating a distinct mechanism of vascular regulation.

A Crystalline Pressor Substance (Angiotonin) Resulting From the Reaction Between Renin and Renin-Activator

Key Points

Discussion

Implication

Cite This Study

A Crystalline Pressor Substance (Angiotonin) Resulting From the Reaction Between Renin and Renin-Activator

Key Points

Discussion

Implication

Cite This Study

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