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[Atrial natriuretic hormone in the human].
J Holtz1, T Münzel, E Bassenge
1Institut für Angewandte Physiologie und Balneologie, Universität Freiburg.
Zeitschrift Fur Kardiologie
|November 1, 1987
Summary
Atrial natriuretic factor (ANF) is released from the heart to regulate blood volume and pressure. This hormone plays a key role in cardiac unloading and may also influence the central nervous system.
Area of Science:
- Cardiovascular Physiology
- Endocrinology
- Neuropeptide Research
Context:
- Cardiac atria contain secretory granules with a prohormone (ANF(1-126)) that is cleaved into active hormone (alpha-ANP) and a fragment.
- Physiological plasma concentrations of ANF are low (around 10 pM) with a short half-life, but increase with elevated blood volume and sodium intake.
Purpose:
- To investigate the physiological role of Atrial Natriuretic Factor (ANF) in blood volume and pressure regulation.
- To elucidate the mechanisms of ANF action and its involvement in cardiac function and central nervous system regulation.
Summary:
- ANF release is stimulated by atrial distension, leading to diuresis, natriuresis, and suppression of the renin-angiotensin-aldosterone system.
- ANF exerts its effects by binding to specific receptors, activating intracellular cGMP formation.
- Receptors are downregulated by hormone infusions and chronic volume expansion; ANF also functions as a neuropeptide in the central nervous system.
Impact:
- ANF plays a crucial role in maintaining cardiovascular homeostasis and fluid balance.
- Understanding ANF's function is vital for managing conditions like congestive heart failure and hypertension.
- Further research into ANF's central nervous system actions could reveal new therapeutic targets for blood pressure regulation.