Simple Fast Quantification of Cholecalciferol, 25-Hydroxyvitamin D and 1,25-Dihydroxyvitamin D in Adipose Tissue Using LC-HRMS/MS

Laurianne Bonnet (1) , Marielle Margier (1) , Ljubica Svilar (2) , Charlène Couturier (1) , Emmanuelle Reboul (1) , Jean-Charles Martin (1, 2) , Jean-Francois Landrier (1, 2) , Catherine Defoort (1, 2)

1 C2VN - Centre recherche en CardioVasculaire et Nutrition = Center for CardioVascular and Nutrition research
2 TIMONE - Hôpital de la Timone [CHU - APHM]

Vitamin D metabolism is actively modulated in adipose tissue during obesity. To better investigate this process, we develop a specific LC-HRMS/MS method that can simultaneously quantify three vitamin D metabolites, i.e., cholecalciferol, 25-hydroxyvitamin D 3 (25(OH)D 3), and 1,25-dihydroxyvitamin D 3 (1,25(OH) 2 D 3) in a complex matrix, such as mouse adipose tissue and plasma. The method uses pretreatment with liquid-liquid or solid-phase extraction followed by derivatization using Amplifex ® reagents to improve metabolite stability and ionization efficiency. Here, the method is optimized by co-eluting stable isotope-labelled internal standards to calibrate each analogue and to spike biological samples. Intra-day and inter-day relative standard deviations were 0.8-6.0% and 2.0-14.4%, respectively for the three derivatized metabolites. The limits of quantification (LoQ) achieved with Amplifex ® derivatization were 0.02 ng/mL, 0.19 ng/mL, and 0.78 ng/mL for 1,25(OH) 2 D 3 , 25(OH)D 3 and cholecalciferol, respectively. Now, for the first time, 1,25(OH) 2 D 3 can be co-quantified with cholecalciferol and 25(OH)D 3 in mouse adipose tissue. This validated method is successfully applied to study the impact of obesity on vitamin D status in mice.

Mots clés: LC-MS/MS; vitamin D metabolite quantification; obesity; adipose tissue

Domaines: Sciences du Vivant [q-bio]; Alimentation et Nutrition

Laurianne Bonnet, Marielle Margier, Ljubica Svilar, Charlène Couturier, Emmanuelle Reboul, et al.. Simple Fast Quantification of Cholecalciferol, 25-Hydroxyvitamin D and 1,25-Dihydroxyvitamin D in Adipose Tissue Using LC-HRMS/MS. Nutrients, 2019, 11 (9), pp.1977. ⟨10.3390/nu11091977⟩. ⟨hal-02487245⟩