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Clinical Chemistry 42: 1542-1546, 1996;
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Clinical Chemistry, Vol 42, 1542-1546, Copyright © 1996 by American Association for Clinical Chemistry

Chemiluminescence: sensitive detection technology for reporter gene assays

I Bronstein, CS Martin, JJ Fortin, CE Olesen and JC Voyta
Tropix, Inc., Bedford, MA 01730, USA. ibronstein@tropix.com

A series of enzyme-activated chemiluminescence-based assays of reporter gene expression, useful in many biomedical applications, has been developed. The chemiluminescence detection systems for beta- galactosidase, beta-glucuronidase (GUS), and secreted placental alkaline phosphatase (SEAP) reporter enzymes are all based on use of 1,2-dioxetane substrates. This detection technology also permits the combined luminescence detection of two different reporter enzymes in the same tube, e.g., a dual assay for beta-galactosidase and luciferase. The sensitivity of these chemiluminescence assays is several orders of magnitude greater than that of conventional colorimetric or fluorometric detection methods; e.g., the detection limit for beta-galactosidase by the chemiluminescence assay is 8 fg and by a fluorometric assay is 2 pg. Furthermore, chemiluminescence enables detection of beta-galactosidase, GUS, and SEAP enzyme concentrations over a dynamic range of more than five to six orders in magnitude. These assays offer highly sensitive, quantitative, rapid, nonisotopic detection of reporter enzymes that are widely used in both mammalian cells and plant cells.


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