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Glycerol tri[3 H]oleate and [14 C]cholesteryl oleate double-labeled triglyceride-rich lipoprotein (TRL)-like particles are a well-established tool to trace the effect of lipid-modulating interventions on TRL metabolism. The routine generation of these particles involves sonication of a lipid mixture and subsequent fractionation of resulting particles into populations of different average size through density gradient ultracentrifugation. Here, we describe a simplified and more time-efficient procedure for preparing TRL-like particles without the need of fractionation. The simplified procedure shortened the preparation of particles from over 4 h to less than 2 h and generated particles with a higher yield, although with a smaller average size and more heterogeneous size distribution. In C57Bl/6J mice housed at thermoneutrality (30°C), the two preparations showed highly comparable plasma clearance and organ distribution of glycerol tri[3 H]oleate-derived [3 H]oleate and [14 C]cholesteryl oleate, as measures of lipolysis and core remnant uptake, respectively. Upon a cold challenge (14°C), plasma clearance was accelerated due to enhanced uptake of glycerol tri[3 H]oleate-derived [3 H]oleate by brown adipose tissue. The simplified procedure resulted in a modestly increased particle uptake by the spleen, while uptake by other organs was comparable between the two preparations. In conclusion, the simplified procedure accelerates the preparation of TRL-like particles for tracing in vivo TRL metabolism. We anticipate that this time-efficient procedure will be useful for incorporation of PET-traceable lipids to obtain more insight into human lipoprotein metabolism.
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