Renal secretion of inactive renin

Area of Science:

• Biochemistry
• Nephrology
• Endocrinology

Background:

• Human plasma contains inactive renin, a precursor that gains enzymatic activity upon exposure to low pH.
• Understanding the role of inactive renin in hypertension is crucial for patient management.

Purpose of the Study:

• To investigate the renal release and activation of inactive renin in patients with renovascular hypertension.
• To explore the implications of inactive renin dynamics for pre-operative evaluation.

Main Methods:

• Measurement of active and inactive renin levels in peripheral and renal veins of patients.
• Calculation of renal to peripheral vein ratios for both renin forms.

Main Results:

• Renal release of inactive renin was indicated in 3 of 13 patients (ratio > 1.40).
• Renal activation of circulating inactive renin was observed in 4 cases (high active renin ratio, low inactive renin ratio).

Conclusions:

• The kidneys possess a mechanism to modulate the activation of renin.
• These findings have practical implications for assessing renovascular hypertension pre-operatively.