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Hemoglobin precipitation greatly improves 4-methylumbelliferone-based diagnostic assays for lysosomal storage diseases in dried blood spots
- Source :
- Molecular Genetics and Metabolism, 102, 44-48. Academic Press
- Publication Year :
- 2011
-
Abstract
- Derivatives of 4-methylumbelliferone (4MU) are favorite substrates for the measurement of lysosomal enzyme activities in a wide variety of cell and tissue specimens. Hydrolysis of these artificial substrates at acidic pH leads to the formation of 4-methylumbelliferone, which is highly fluorescent at a pH above 10. When used for the assay of enzyme activities in dried blood spots the light emission signal can be very low due to the small sample size so that the patient and control ranges are not widely separated. We have investigated the hypothesis that quenching of the fluorescence by hemoglobin leads to appreciable loss of signal and we show that the precipitation of hemoglobin with trichloroacetic acid prior to the measurement of 4-methylumbelliferone increases the height of the output signal up to eight fold. The modified method provides a clear separation of patients' and controls' ranges for ten different lysosomal enzyme assays in dried blood spots, and approaches the conventional leukocyte assays in outcome quality.
- Subjects :
- Adult
Adolescent
Endocrinology, Diabetes and Metabolism
Fractional Precipitation
Biochemistry
Fluorescence
Hemoglobins
chemistry.chemical_compound
Hydrolysis
Endocrinology
Leukocytes
Genetics
Humans
Trichloroacetic Acid
Trichloroacetic acid
Molecular Biology
Enzyme Assays
chemistry.chemical_classification
biology
Spots
Infant
Clinical Enzyme Tests
Enzyme assay
Enzymes
Lysosomal Storage Diseases
Enzyme
chemistry
Case-Control Studies
biology.protein
Indicators and Reagents
Light emission
Hemoglobin
Hymecromone
Subjects
Details
- ISSN :
- 10967192
- Database :
- OpenAIRE
- Journal :
- Molecular Genetics and Metabolism, 102, 44-48. Academic Press
- Accession number :
- edsair.doi.dedup.....b1bceece82a5f0d4b46a262aab8fa06f