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Journal of Lipid Research, Vol 26, 380-386, Copyright © 1985 by Lipid Research, Inc.
Enzyme-linked immunosorbent assay for rat hepatic triglyceride lipase
LA Cisar and A Bensadoun
A noncompetitive enzyme-linked immunosorbent assay to measure rat hepatic
triglyceride lipase (H-TGL) was developed. Antibodies to rat H- TGL were
purified from goat antisera by immunoadsorption on an H-TGL- Sepharose 4B
column. Routinely, Immulon 2 Removawell strips were coated with the
purified antibody overnight at 4 degrees C. After blocking the wells with
bovine serum albumin (BSA) for 2 hr at room temperature, standards (0.85
ng/ml-13.1 ng/ml) or samples were added to the wells and were incubated
with the bound anti-rat H-TGL overnight at 4 degrees C. The standards and
samples had been pretreated with 5-20 mM SDS for 30 min at room temperature
and were then diluted so that the final SDS concentration in the assay was
1 mM or less. The pretreatment with SDS was necessary to achieve maximal
immunoreactivity. The sample incubation was followed by an overnight
incubation at 4 degrees C with an anti-rat H-TGL-horseradish peroxidase
conjugate. Rat H-TGL was detected by the color development after the
addition of 0.4 mg/ml of o- phenylenediamine in 0.01% H2O2, 0.1 M citrate
phosphate, pH 5.0. A linear relationship was obtained between absorbance at
490 nm and the amount of highly purified rat H-TGL used as a standard.
Inclusion of 1 M NaCl in the assay buffer (1% BSA, 0.05% Tween 20, 10 mM
phosphate, pH 7.4) during the sample and conjugate incubations minimized
non-specific interactions. Recoveries of purified rat H-TGL added to a rat
liver perfusate sample ranged from 98.6% to 103%.(ABSTRACT TRUNCATED AT 250
WORDS)

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Copyright © 1985 by the American Society for Biochemistry and Molecular Biology.
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