Abstract
The cis- and trans-methoxyvinylpyrene (MVP) analogues of benzo[a]pyrene-7,8-dihydrodiol (7,8-diol) produce specific microsomal chemiluminescence comparable to that produced from 7,8-diol in Aroclor-induced rat liver microsome preparations. The chemiluminescence quantum yields, emission spectra, and the concentration and the temporal kinetics of these three substrates have been examined. Radiolabelled 7,8-diol and t-MVP exhibit significant covalent binding (more than 14%) to microsomal protein when metabolized enzymatically. The extreme quenching of the dioxetane chemiluminescence by both microsomes and phosphatidylcholine, as a model phospholipid, implies that despite the low quantum yield (approx. 10-8 photons per substrate molecule) for microsomal chemiluminescence of these substrates, a significant fraction of their microsomal oxygenations may proceed via a dioxetane pathway.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 210-219 |
| Number of pages | 10 |
| Journal | BBA - General Subjects |
| Volume | 882 |
| Issue number | 2 |
| DOIs | |
| State | Published - Jun 19 1986 |
Keywords
- (Microsome)
- Benzo[a]pyrene analog
- Chemiluminescence
- Dioxetane
- Methoxyvinylpyrene
ASJC Scopus subject areas
- Biophysics
- Biochemistry
- Molecular Biology