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Multiple forms of renin substrate in human plasma.

K E Lentz, F E Dorer, J R Kahn

Clinica Chimica Acta; International Journal of Clinical Chemistry

|February 15, 1978

Summary

Human plasma contains multiple forms of renin substrate (angiotensinogen), identified using chromatography and isoelectric focusing. These forms show consistent distribution across various physiological states and treatments.

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Clinical chemistry·2000

Area of Science:

Biochemistry
Endocrinology
Proteomics

Background:

Renin substrate, also known as angiotensinogen, is a key component of the renin-angiotensin system.
Previous studies suggested heterogeneity in renin substrate, but detailed characterization was limited.

Purpose of the Study:

To investigate the existence and characteristics of multiple renin substrate forms in human plasma.
To analyze the distribution of these forms under different physiological conditions.

Main Methods:

DEAE-cellulose chromatography with descending pH gradient elution.
Isoelectric focusing using ampholytes in a pH 3.5-5 range.

Main Results:

Two major and several minor renin substrate forms were resolved by DEAE-cellulose chromatography, eluting predominantly near pH 4.8 and 4.4.

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Isoelectric focusing revealed up to eight distinct renin substrate forms, with four major forms identified in plasma from a woman on estrogen therapy.

The elution and focusing patterns of these forms remained relatively consistent across normal individuals and those with diabetes, pregnancy, or estrogen therapy.

Conclusions:

Human plasma renin substrate exhibits significant molecular heterogeneity.
The distribution of renin substrate forms is largely conserved across different physiological states, suggesting a stable underlying structure or regulatory mechanism.