Background
Doxycycline-d3 is intended for use as an internal standard for the quantification of doxycycline by GC- or LC-MS. Doxycycline is a broad-spectrum tetracycline antibiotic.1,2 It inhibits bacterial protein synthesis by binding to ribosomes.2,3 Doxycycline also selectively inhibits human matrix metalloproteinase-8 (MMP-8) and MMP-13 over MMP-1 with 50, 60, and 5% inhibition, respectively, when used at a concentration of 30 μM.4 It can be used as a regulator for inducible gene expression systems where expression depends on either the presence (Tet-On) or absence (Tet-Off) of doxycycline.5,6 Formulations containing doxycycline have been used in the treatment of bacterial infections and the prevention of malaria.
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