Gaucher cells md pathology exam question robbins based answer
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Gaucher cells
Definition:
Gaucher cells are large, lipid-laden macrophages seen characteristically in Gaucher disease, an autosomal recessive lysosomal storage disorder caused by deficiency of β-glucocerebrosidase.
Gaucher cells are large, lipid-laden macrophages seen characteristically in Gaucher disease, an autosomal recessive lysosomal storage disorder caused by deficiency of β-glucocerebrosidase.
Pathogenesis
- Mutation in the GBA gene causes deficient glucocerebrosidase activity.
- Normally, this enzyme removes glucose from ceramide.
- Deficiency causes accumulation of glucocerebroside (glucosylceramide) within lysosomes, mainly in macrophages of the mononuclear phagocyte system.
- The enlarged, storage-laden macrophages are called Gaucher cells.
Morphology of Gaucher cells
- Large, plump macrophages, often up to 100 μm in diameter.
- One or more small, dark, eccentrically placed nuclei.
- Cytoplasm is abundant, pale, and finely fibrillary with the classic “crumpled tissue paper” appearance.
- Unlike Niemann-Pick cells, Gaucher cells are not typically foamy or vacuolated.
- PAS stain: strongly positive.
- Electron microscopy: elongated, distended lysosomes containing stored lipid arranged in stacks of bilayers.
Sites where found
Gaucher cells occur especially in:
- Bone marrow - an important diagnostic site
- Spleen
- Liver
- Lymph nodes
- Tonsils
- Thymus
- Peyer patches
- Lungs, including alveolar septa and air spaces
Clinical significance
Accumulation in marrow and reticuloendothelial organs causes:
- Massive splenomegaly and hepatomegaly
- Cytopenias, especially thrombocytopenia and anemia, due to hypersplenism and marrow infiltration
- Bone pain, osteopenia, bone infarction, erosions, and pathological fractures
Macrophage activation and cytokine release, including IL-1, IL-6, and TNF, also contribute to bone destruction and systemic disease.
Important differential: Gaucher vs Niemann-Pick cells
| Feature | Gaucher cell | Niemann-Pick cell |
|---|---|---|
| Stored lipid | Glucocerebroside | Sphingomyelin |
| Cytoplasm | Wrinkled, fibrillary, “crumpled tissue paper” | Foamy, vacuolated |
| Enzyme defect | β-glucocerebrosidase | Sphingomyelinase in types A/B |
| PAS stain | Strongly positive | Not the classic defining feature |
| EM | Tubular/elongated lysosomes with bilayer stacks | Lamellated myelin figures or zebra bodies |
Exam one-liner:
Gaucher cells are enlarged PAS-positive macrophages with eccentric nuclei and fibrillary “crumpled tissue paper” cytoplasm due to lysosomal accumulation of glucocerebroside in β-glucocerebrosidase deficiency.
Gaucher cells are enlarged PAS-positive macrophages with eccentric nuclei and fibrillary “crumpled tissue paper” cytoplasm due to lysosomal accumulation of glucocerebroside in β-glucocerebrosidase deficiency.
Source: Robbins, Cotran & Kumar Pathologic Basis of Disease, pp. 154-155.
Brief about gaucher disease
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Gaucher disease - brief note
Gaucher disease is the most common autosomal recessive lysosomal storage disorder.
Defect
- Mutation in GBA gene
- Deficiency of β-glucocerebrosidase
- Causes accumulation of glucocerebroside (glucosylceramide) in macrophage lysosomes.
Pathology
Lipid-laden macrophages, called Gaucher cells, accumulate in:
- Spleen
- Liver
- Bone marrow
- Lymph nodes and lungs
Gaucher cells: large macrophages with eccentric nuclei and abundant fibrillary cytoplasm resembling “crumpled tissue paper.” They are strongly PAS-positive.
Clinical features
- Massive splenomegaly ± hepatomegaly
- Anemia and thrombocytopenia due to hypersplenism/marrow infiltration
- Bone pain, osteopenia, infarcts, bone erosion, pathological fractures
- Cytokine release by activated macrophages contributes to bone damage.
Types
-
Type I: Chronic non-neuronopathic
- Most common
- No CNS involvement
- Splenic and skeletal disease predominate.
-
Type II: Acute neuronopathic
- Infancy
- Severe progressive CNS disease
- Early death.
-
Type III: Chronic neuronopathic
- Systemic disease with gradually progressive neurologic involvement, often beginning in adolescence or early adulthood.
Diagnosis and treatment
- Diagnosis: reduced glucocerebrosidase activity and GBA mutation analysis.
- Treatment: enzyme replacement therapy and, in selected patients, substrate-reduction therapy.
One-line answer:
Gaucher disease is an AR lysosomal storage disorder due to β-glucocerebrosidase deficiency, causing glucocerebroside accumulation in macrophages and formation of PAS-positive Gaucher cells with “crumpled tissue paper” cytoplasm.
Gaucher disease is an AR lysosomal storage disorder due to β-glucocerebrosidase deficiency, causing glucocerebroside accumulation in macrophages and formation of PAS-positive Gaucher cells with “crumpled tissue paper” cytoplasm.
Source: Robbins, Cotran & Kumar Pathologic Basis of Disease, pp. 154-155.
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