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Atrial natriuretic peptide in man.
P Weidmann1, H Saxenhofer, S G Shaw
1Medizinische Poliklinik, University of Berne, Switzerland.
Journal of Steroid Biochemistry
|January 1, 1989
Summary
Atrial natriuretic peptides (ANP) are secreted by the heart in response to volume overload. This peptide system plays a crucial role in cardiovascular and renal function, potentially protecting the heart from pressure overload.
Area of Science:
- Cardiology
- Endocrinology
- Nephrology
Background:
- Atrial natriuretic peptides (ANP) are primarily produced by the heart's atria.
- A precursor peptide is stored within atrial myocytes.
- Secretion of active alpha-ANP (ANF-[99-126]) is stimulated by atrial distension due to volume overload or increased atrial pressures.
Purpose of the Study:
- To review the physiological roles and effects of atrial natriuretic peptides (ANP).
- To explore the ANP system's involvement in cardiovascular regulation, fluid balance, and hormonal modulation.
- To discuss the potential pathophysiological, diagnostic, and therapeutic implications of ANP in various diseases.
Main Methods:
- Review of existing literature on atrial natriuretic peptides (ANP).
- Analysis of factors influencing plasma immunoreactive ANP (irANP) levels.
- Examination of the effects of synthetic alpha-ANP administration in vivo.
Main Results:
- Plasma irANP levels increase with sodium-volume loading, body position changes, increased blood pressure, exercise, and administration of certain hormones.
- Plasma irANP levels also rise with aging.
- Synthetic alpha-ANP infusion lowers blood pressure, induces fluid shifts, activates the sympathetic nervous system, inhibits adrenal steroidogenesis and renin release, and elevates plasma insulin.
Conclusions:
- The ANP system influences cardiovascular and renal function, potentially acting as a cardio-adrenal feedback mechanism.
- ANP may modulate insulin and antidiuretic hormone (ADH) release.
- The primary physiological role of ANP may be to protect the heart against volume and pressure overload, with significant clinical interest in its pathophysiological, diagnostic, and therapeutic applications.