20-HETE-d6

20-HETE-d6 is a deuterated form of 20-hydroxyeicosatetraenoic acid (20-HETE). It contains six deuterium atoms at positions 16, 16′, 17, 17′, 18, and 18′. This isotopic labeling is specifically designed for its use as an internal standard in the quantification of 20-HETE by gas chromatography-mass spectrometry (GC-MS) or liquid chromatography-mass spectrometry (LC-MS). 20-HETE is a metabolite of cytochrome P450 (CYP450) enzymes and is believed to play an autacoid role in the regulation of renal and cerebral vasculature. In rat cerebral microvessels, 20-HETE acts as a vasoconstrictor, contributing to pressure-induced autoregulatory vasoconstriction. The deuterated form, 20-HETE-d6, serves as an analytical tool to accurately measure and quantify endogenous levels of 20-HETE in biological samples. The primary scientific application of 20-HETE-d6 lies in its use as an internal standard in GC-MS or LC-MS methods for the determination of 20-HETE concentrations. By adding a known amount of 20-HETE-d6 to biological samples, researchers can precisely measure the levels of endogenous 20-HETE. This allows for the investigation of 20-HETE′s involvement in various physiological and pathological processes, including vascular regulation, blood pressure control, and cerebral autoregulation. In addition to its vasoconstrictor activity, 20-HETE is known to be excreted mainly as a glucuronide conjugate. Interestingly, the concentration of free 20-HETE in human urine is approximately 10-fold lower than the concentration of its corresponding glucuronide conjugate. This information provides insights into the metabolism and excretion of 20-HETE, which can be further explored using 20-HETE-d6 as an internal standard.