Active immunization against renin in normotensive marmoset

Area of Science:

• Immunology
• Nephrology
• Endocrinology

Background:

• Primate renins are highly similar, making them suitable for cross-species immunological studies.
• The renin-angiotensin system plays a crucial role in blood pressure regulation.

Purpose of the Study:

• To investigate the effects of chronic renin-angiotensin system blockade via active immunization in primates.
• To assess the safety and efficacy of using homologous renin immunization to inhibit renin activity.

Main Methods:

• Marmosets were immunized with pure human renin and Freund's adjuvant.
• Blood pressure, plasma renin activity, and aldosterone levels were monitored weekly.
• Immunohistochemistry was used to examine kidney tissue post-mortem.

Main Results:

• Immunization successfully generated high titers of renin antibodies, inhibiting both marmoset and human renin activity.
• A significant decrease in systolic blood pressure and plasma aldosterone was observed.
• All immunized marmosets developed autoimmune kidney disease and died within 1-5 months.

Conclusions:

• Active immunization against homologous renin can chronically blockade the renin-angiotensin system in primates.
• This blockade, however, triggers a localized autoimmune renal disease, leading to fatal outcomes.