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Abnormal acid phosphatases in neuronal ceroid-lipofuscinoses
K M Khan1, S S Brooks, R K Pullarkat
1New York State Office of Mental Retardation and Developmental Disabilities, New York State Institute for Basic Research in Developmental Disabilities, Staten Island, USA.
American Journal of Medical Genetics
|June 5, 1995
Summary
Neuronal ceroid-lipofuscinoses (NCL) patients exhibit abnormal acid phosphatase activity in brain and lymphoblasts. These enzymatic changes, particularly altered electrophoretic bands, are characteristic of NCL disease.
Area of Science:
- Biochemistry
- Neuroscience
- Genetics
Background:
- Neuronal ceroid-lipofuscinoses (NCL) are a group of inherited neurodegenerative disorders.
- Acid phosphatases are enzymes implicated in cellular metabolism and lysosomal function.
- Previous studies suggested potential enzymatic alterations in NCL, but specific characterization was needed.
Purpose of the Study:
- To investigate acid phosphatase activity and electrophoretic patterns in brain and cultured lymphoblasts from NCL patients.
- To determine if altered acid phosphatase is a characteristic biomarker for different forms of NCL.
- To assess acid phosphatase activity in obligate heterozygotes and related enzyme activities.
Main Methods:
- Starch gel electrophoresis of acid phosphatases from control and NCL patient brain and lymphoblast samples.
- Histochemical staining using 4-methylumbelliferyl phosphate and visualization under UV light.
- Fluorometric assays to quantify acid phosphatase activity and assess tartrate inhibition.
- Analysis of lymphocyte hexosaminidase activity for comparison.
Main Results:
- NCL patients displayed two additional fast-moving acid phosphatase bands in brain and lymphoblasts compared to controls.
- The electrophoretic pattern varied between juvenile and late-infantile/adult (Kufs disease) forms of NCL.
- Obligate heterozygotes showed reduced levels of these fast-moving bands.
- Fluorometric assays revealed a 2-fold increase in acid phosphatase activity in NCL patients, fully inhibited by tartrate.
- Lymphocyte hexosaminidase activity remained unchanged in NCL patients.
Conclusions:
- Abnormal acid phosphatase electrophoretic patterns and increased activity are characteristic biochemical markers of neuronal ceroid-lipofuscinoses.
- These enzymatic alterations are detectable in both brain tissue and cultured lymphoblasts.
- The findings support the utility of acid phosphatase analysis in the diagnosis and understanding of NCL.