Seema Dawood: How Blister Cells Reveal Oxidative Damage in G6PD Deficiency
Seema Dawood, Medical Laboratory Technologist at The Aga Khan University Hospital, shared a post on LinkedIn:
“Blister Cell in G6PD Deficiency
Red Blood Cell with a clear vacuole-like area on its membrane, resembling a blister.
It usually results when splenic macrophages remove precipitated Heinz bodies from the red cell, leaving a blister-like defect.
The spleen then ‘bites out’ or removes these Heinz body–containing areas, producing Blister cells (early stage, vacuolated appearance) then Bite cells (after the blister ruptures or is removed)
G6PD Deficiency
Genetic disorder characterized by low levels of the enzyme glucose-6-phosphate dehydrogenase (G6PD).
This enzyme plays a critical role in protecting red blood cells from oxidative damage.
When G6PD is deficient, red blood cells become fragile and more susceptible to destruction, leading to hemolytic anemia.
Genetic Characteristics
- Inheritance: X-linked recessive
- More common in males
- Females are usually carriers, but some may exhibit symptoms due to lyonization (X-inactivation)
Blood Smear Features
- Bite cells Result from splenic removal of Heinz bodies
- Blister cells Red cells with vacuolated appearance, precursor to bite cells
- Heinz bodies Denatured hemoglobin aggregates caused by oxidative stress
Heinz bodies are best visualized using supravital stains, such as Brilliant Cresyl Blue.
Common Clinical Presentations
- Newborns : Severe jaundice (neonatal hyperbilirubinemia)
- Children/Adults: Pallor, jaundice, dark urine (hemoglobinuria), fatigue, and acute hemolytic anemia following oxidative trigger
Triggers of Hemolysis
- Medications: Sulfa drugs, antimalarials (e.g., Primaquine), high-dose aspirin
- Foods: Fava beans (favism)
- Infections: A major trigger of hemolysis
- Certain chemicals
Diagnosis
- G6PD enzyme activity assay
- Peripheral blood smear: Presence of bite cells and blister cells
- Heinz body stain: Using supravital dyes (e.g., Brilliant Cresyl Blue).”
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