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The relationship between alkaline phosphatase activity and intracellular lipid accumulation in murine 3T3-L1 cells and human preadipocytes

The relationship between alkaline phosphatase activity and intracellular lipid accumulation in murine 3T3-L1 cells and human preadipocytes

Analytical Biochemistry 354(2): 247-254

ISSN/ISBN: 0003-2697

PMID: 16750158

DOI: 10.1016/j.ab.2006.04.028

Alkaline phosphatase (ALP) is expressed in 3T3-L1 preadipocytes, and its activity increases during adipogenesis. The purpose of this study was to determine whether ALP activity could be used as a measure of intracellular lipid accumulation in human preadipocytes and 3T3-L1 cells and which of the factors that induce adipogenesis are responsible for stimulating ALP activity. Adipogenesis was initiated in 3T3-L1 cells by incubation with differentiation medium containing insulin, dexamethasone, and 3-isobutyl-1-methylxanthine. The effect of leaving out each of the differentiation medium components was studied. Adipogenesis was also assessed in human preadipocytes and 3T3-L1 cells in the presence of the ALP inhibitor histidine. ALP activity was measured using an automated colorimetric assay and intracellular lipid accumulation was measured using the lipid-specific dye oil red O. Removal of insulin or dexamethasone from the differentiation medium had little effect on either ALP activity or lipid accumulation in 3T3-L1 cells, while removal of IBMX blocked both. Histidine inhibited ALP activity and adipogenesis in human preadipocytes and 3T3-L1 cells. Pearson univariate correlation analysis demonstrated strong correlations between ALP activity and lipid accumulation in human preadipocytes (r=0.78, n=69) and in 3T3-L1 cells (r=0.92, n=27). These data suggest that ALP and fat storage are tightly linked during preadipocyte maturation and that the measurement of ALP activity may be a novel technique for the quantification of intracellular lipid accumulation that is more sensitive and rapid than currently used methods.

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Accession: 012674799

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