Chromaffin: Cells, Function and Disorders
Chromaffin cells are specialized neuroendocrine cells found mainly in the adrenal medulla that produce and release stress hormones such as adrenaline and noradrenaline.
Things worth knowing about "Chromaffin"
Chromaffin cells are specialized neuroendocrine cells found mainly in the adrenal medulla that produce and release stress hormones such as adrenaline and noradrenaline.
What does chromaffin mean?
The term chromaffin refers to a specific property of certain cells in the nervous system: they react with chromium salts (particularly potassium dichromate) by turning a characteristic brown color. This so-called chromaffin reaction was historically used as a key identifying feature, giving these cells their name. The word is derived from the Greek chroma (color) and the Latin affinis (related, akin).
Chromaffin Cells: Location and Structure
Chromaffin cells are specialized neuroendocrine cells located primarily in the adrenal medulla -- the inner part of the adrenal gland situated above each kidney. Smaller clusters of chromaffin cells are also found along the spine in structures called paraganglia, as well as in the pelvis, thorax, and head and neck region.
From a developmental perspective, chromaffin cells originate from the neural crest and are closely related to neurons of the sympathetic nervous system. They are therefore considered modified postganglionic nerve cells.
Function of Chromaffin Cells
The primary role of chromaffin cells is the synthesis, storage, and secretion of catecholamines, especially:
- Adrenaline (epinephrine): the main stress hormone, produced primarily in the adrenal medulla.
- Noradrenaline (norepinephrine): a key catecholamine that regulates blood pressure and heart rate.
- Dopamine: present in small amounts as a precursor substance.
These hormones are released in response to physical or psychological stress via the sympathetic nervous system, triggering the classic fight-or-flight response: heart rate and blood pressure increase, blood flow to the muscles improves, the pupils dilate, and blood glucose levels rise.
Medical Relevance: Diseases of Chromaffin Cells
Pheochromocytoma
A pheochromocytoma is typically a benign tumor of the chromaffin cells of the adrenal medulla. It produces uncontrolled amounts of catecholamines, leading to episodic or persistent symptoms such as high blood pressure, rapid heartbeat, headaches, sweating, and pallor. If left untreated, a pheochromocytoma can be life-threatening.
Paraganglioma
A paraganglioma is a tumor arising from chromaffin cells outside the adrenal medulla -- specifically from the paraganglia. These tumors may be hormonally active or inactive and often occur in the abdomen, thorax, or head and neck region.
Neuroblastoma
A neuroblastoma is a malignant tumor that develops from immature precursor cells of the chromaffin lineage. It predominantly affects infants and young children and is one of the most common solid tumors in childhood.
Diagnosis
Conditions involving chromaffin cells are diagnosed using a range of methods:
- Laboratory tests: measurement of catecholamines and their breakdown products (metanephrines, normetanephrines) in blood or urine.
- Imaging: ultrasound, computed tomography (CT), or magnetic resonance imaging (MRI) to localize tumors.
- Nuclear medicine: MIBG scintigraphy (meta-iodobenzylguanidine) or PET-CT for targeted visualization of chromaffin tumor tissue.
Treatment
The treatment of chromaffin cell tumors depends on the type, location, and extent of the tumor. In most cases, surgical removal (resection) is the treatment of choice. Prior to surgery, patients typically receive alpha- and beta-blockers to prevent dangerous fluctuations in blood pressure. For malignant tumors, additional options include radiation therapy, chemotherapy, or nuclear medicine treatments.
References
- Kasper, D.L. et al. - Harrison's Principles of Internal Medicine, 21st Edition, McGraw-Hill Education, 2022.
- Lenders, J.W.M. et al. - Phaeochromocytoma and paraganglioma: an Endocrine Society clinical practice guideline. Journal of Clinical Endocrinology and Metabolism, 2014. DOI: 10.1210/jc.2014-1498.
- World Health Organization (WHO) - Classification of Tumours of Endocrine Organs, 4th Edition, IARC Press, Lyon, 2017.
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