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Catecholamines: Adrenaline, Noradrenaline and Dopamine
Catecholamines are endogenous signaling molecules such as adrenaline, noradrenaline, and dopamine that act as stress hormones and neurotransmitters, regulating vital body functions.
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Catecholamines are endogenous signaling molecules such as adrenaline, noradrenaline, and dopamine that act as stress hormones and neurotransmitters, regulating vital body functions.
What Are Catecholamines?
Catecholamines are a group of biogenic amines that function as both hormones and neurotransmitters in the human body. The most important catecholamines are adrenaline (epinephrine), noradrenaline (norepinephrine), and dopamine. They are synthesized from the amino acid tyrosine and play a central role in regulating stress responses, cardiovascular function, and neurological processes.
Production and Release
Catecholamines are primarily produced in two areas of the body:
- Adrenal medulla: This is where adrenaline (approximately 80%) and noradrenaline (approximately 20%) are produced and released directly into the bloodstream during stress or danger.
- Nervous system: Noradrenaline and dopamine are released as neurotransmitters at nerve endings of the sympathetic nervous system and within the brain.
Release is controlled by the autonomic nervous system, particularly the sympathetic nervous system, which is activated during physical or emotional stress.
Mechanism of Action
Catecholamines exert their effects by binding to specific adrenoceptors (alpha and beta receptors) on target cells. Depending on the receptor type and affected tissue, different physiological effects result:
- Adrenaline: Increases heart rate and blood pressure, dilates the bronchi, and mobilizes energy reserves (glucose and fatty acids) -- the classic "fight-or-flight" response.
- Noradrenaline: Primarily causes vasoconstriction, raises blood pressure, and plays an important role in alertness and attention.
- Dopamine: Regulates motivation, reward processing, motor control, and influences renal blood flow.
Medical Significance
Disorders Caused by Over- or Underproduction
An imbalance in catecholamine production can lead to serious medical conditions:
- Pheochromocytoma: A usually benign tumor of the adrenal medulla that produces excessive catecholamines, causing episodic hypertension, sweating, and palpitations.
- Parkinson's disease: Significant dopamine deficiency in specific brain regions leads to movement disorders.
- Depression and ADHD: Altered noradrenaline and dopamine levels are involved in the development of these psychiatric conditions.
- Shock: In certain types of shock, catecholamine secretion is either markedly elevated or depleted.
Therapeutic Use
Synthetically produced or nature-identical catecholamines are used in medicine for targeted therapeutic purposes:
- Adrenaline for anaphylactic shock, cardiopulmonary resuscitation, and severe asthma attacks.
- Noradrenaline for blood pressure stabilization in septic shock in intensive care settings.
- Dopamine (at high doses) for circulatory support in heart failure.
Diagnostics
To measure catecholamines and their metabolites (e.g., metanephrines, vanillylmandelic acid), the following tests are used:
- 24-hour urine collection: Standard method for determining catecholamine excretion.
- Plasma metanephrines: A highly sensitive blood test, particularly useful for diagnosing pheochromocytoma.
- Plasma levels: Direct measurement of adrenaline, noradrenaline, and dopamine in the blood.
References
- Goldstein, D. S.: Catecholamines 101. Clinical Autonomic Research, 2010; 20(6):331–352. PubMed PMID: 20697913.
- Eisenhofer, G. et al.: Catecholamine Metabolism: A Contemporary View with Implications for Physiology and Medicine. Pharmacological Reviews, 2004; 56(3):331–349.
- Longo, D. L. et al. (Eds.): Harrison's Principles of Internal Medicine, 20th Edition. McGraw-Hill Education, New York, 2018.
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