Porphyria – Causes, Symptoms and Treatment
Porphyria refers to a group of rare metabolic disorders in which the production of heme is disrupted, causing toxic precursors to accumulate in the body.
Things worth knowing about "Porphyria"
Porphyria refers to a group of rare metabolic disorders in which the production of heme is disrupted, causing toxic precursors to accumulate in the body.
What is Porphyria?
Porphyria is an umbrella term for a group of rare metabolic disorders caused by disruptions in the biosynthesis of heme – the iron-containing component of hemoglobin, the red blood cell pigment. Due to this defect, substances called porphyrins or their precursors accumulate in the blood, tissues, and organs, where they exert toxic effects. Most forms of porphyria are inherited, but acquired forms also exist.
Causes
Porphyria results from an enzyme defect within the heme synthesis pathway. The human body requires eight enzymes to produce heme. An inherited or acquired deficiency in any one of these enzymes leads to a specific type of porphyria. The most common forms include:
- Acute Intermittent Porphyria (AIP): Autosomal dominant defect in the enzyme porphobilinogen deaminase.
- Porphyria Cutanea Tarda (PCT): The most common form; caused by uroporphyrinogen decarboxylase deficiency, often triggered by alcohol use, iron overload, or hepatitis C infection.
- Erythropoietic Protoporphyria (EPP): Defect in ferrochelatase, leading to pronounced light sensitivity.
- Hereditary Coproporphyria (HCP) and Variegate Porphyria (VP): Additional acute hepatic forms affecting other enzymatic steps.
Acute attacks can be triggered by certain medications (e.g., barbiturates, sulfonamides), alcohol, fasting, infections, stress, or hormonal changes.
Symptoms
Symptoms vary significantly depending on the type of porphyria. A key distinction is made between acute (neurovisceral) and cutaneous (skin-related) forms:
Acute Porphyrias
- Severe, colicky abdominal pain (most common symptom)
- Nausea, vomiting, constipation, or diarrhea
- Neurological symptoms: tingling, muscle weakness, paralysis, seizures
- Psychiatric symptoms: anxiety, confusion, hallucinations, depression
- Rapid heartbeat (tachycardia) and high blood pressure
- Dark (reddish-brown) urine due to excreted porphyrins
Cutaneous Porphyrias
- Extreme sensitivity of the skin to sunlight (photosensitivity)
- Blistering, redness, and swelling after sun exposure
- Chronic skin thickening and scarring
- Hypertrichosis (excessive facial hair growth)
Diagnosis
Diagnosing porphyria requires specific laboratory tests, as symptoms are often non-specific and easily misinterpreted:
- Urine analysis: Detection of elevated porphyrins, aminolevulinic acid (ALA), and porphobilinogen (PBG) – especially during an acute attack.
- Stool analysis: Measurement of fecal porphyrins to differentiate between forms.
- Blood tests: Measurement of erythrocyte porphyrins (e.g., in EPP).
- Genetic testing: Molecular genetic analysis for confirmation and family screening.
- Enzyme activity measurement: Available in specialized laboratories.
Because porphyria is rare, patients often wait years before receiving a correct diagnosis. Specialized porphyria centers play a crucial role in early and accurate detection.
Treatment
Treatment depends on the specific type of porphyria and its severity:
Acute Porphyrias
- Hemin infusion (Normosang): Intravenous administration of hemin to suppress excessive heme synthesis – the treatment of choice in severe acute attacks.
- Carbohydrate loading: High-calorie glucose infusions can attenuate mild attacks (the glucose effect).
- Givosiran (Alnylam): An approved RNA interference therapy for the prevention of recurrent acute attacks in patients with acute hepatic porphyria.
- Avoiding trigger factors: Eliminating causative medications, alcohol, and prolonged fasting.
- Symptomatic treatment: Opioids for pain, antiemetics for nausea, beta-blockers for tachycardia as needed.
Cutaneous Porphyrias (e.g., PCT)
- Phlebotomy (bloodletting): Regular blood removal to reduce iron stores in the liver.
- Chloroquine or hydroxychloroquine: Low-dose therapy to mobilize porphyrins from the liver.
- Sun protection: Consistent protection from sunlight using clothing and specialized sunscreens.
Erythropoietic Protoporphyria (EPP)
- Afamelanotide (Scenesse): An approved subcutaneous implant to reduce photosensitivity in adults with EPP.
- Strict sun avoidance and beta-carotene supplementation.
Living with Porphyria
Porphyria is a chronic condition that can be well managed with the right approach. Patients are advised to carry an emergency card indicating their diagnosis and listing safe and contraindicated medications. Regular follow-up at a specialized porphyria center is strongly recommended.
References
- European Porphyria Network (EPNET) – Guidelines on the Diagnosis and Management of Porphyrias. www.porphyria.eu
- Bissell DM, Anderson KE, Bonkovsky HL. Porphyria. New England Journal of Medicine. 2017;377(9):862–872.
- Anderson KE et al. Recommendations for the Diagnosis and Treatment of the Acute Porphyrias. Annals of Internal Medicine. 2005;142(6):439–450.
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