Vitamin D receptor Cdx-2-dependent response of central obesity to vitamin D intake in the subjects with type 2 diabetes: a randomised clinical trial

• Published in: British journal of nutrition Vol. 114; no. 9; pp. 1375 - 1384
• Main Authors: Shab-Bidar, Sakineh, Neyestani, Tirang R., Djazayery, Abolghassem
• Format: Journal Article
• Language: English
• Published: Cambridge, UK Cambridge University Press 14.11.2015
• Subjects: Adipose tissue; Adiposity; Adult; Blood Glucose - metabolism; blood serum; Body Mass Index; Body Weight; calcium; CDX2 Transcription Factor; Cholecalciferol - administration & dosage; Cholecalciferol - blood; Clinical trials; Diabetes; Diabetes Mellitus, Type 2 - blood; Diabetes Mellitus, Type 2 - diet therapy; Diabetes Mellitus, Type 2 - genetics; Dose-Response Relationship, Drug; Energy Intake; fat body; Female; Food, Fortified; genotype; Genotype & phenotype; Genotypes; Genotyping Techniques; Homeodomain Proteins - genetics; Homeodomain Proteins - metabolism; Humans; Male; Middle Aged; Molecular Nutrition; noninsulin-dependent diabetes mellitus; nutrient intake; Nutrigenomics; Nutrition; Nutrition Assessment; Obesity; Obesity, Abdominal - blood; Obesity, Abdominal - diet therapy; Obesity, Abdominal - genetics; Patient Compliance; Polymorphism, Single Nucleotide; randomized clinical trials; Randomized Controlled Trials as Topic; Receptors, Calcitriol - genetics; Receptors, Calcitriol - metabolism; Single-Blind Method; Vitamin D; Vitamin D Deficiency - blood; Vitamin D Deficiency - diet therapy; Waist Circumference; Yogurt; Visceral fat; Type 2 diabetes; Vitamin D receptor genotype; Vitamin D; Adiposity; Vitamin D receptor; Fat mass; PD plain doogh; FD fortified doogh; 25(OH)D 25-hydroxyvitamin D; HbA1c glycated Hb; QUICKI Quantitative Insulin Check Index; VDR vitamin D receptor; TF trunk fat; T2D type 2 diabetes; WC waist circumference; VAT visceral adipose tissue; FM fat mass
• ISSN: 0007-1145; 1475-2662; 1475-2662
• DOI: 10.1017/S0007114515003049

This study aimed to investigate the effects of daily intake of vitamin D-fortified yogurt drink (doogh) on central obesity indicators in subjects with type 2 diabetes (T2D) and the possible modulation of this effect by vitamin D receptor (VDR) Cdx-2 genotypes. A total of sixty T2D subjects were randomly allocated to two groups to receive either plain doogh (PD; n 29, containing 170 mg Ca and no vitamin D/250 ml) or vitamin D3-fortified doogh (FD; n 31, containing 170 mg Ca and 12·5 μg/250 ml) twice a day for 12 weeks. 25-hydroxyvitamin D (25(OH)D), glycaemic as well as adiposity indicators were evaluated before and after the intervention. VDR-Cdx-2 genotypes in extended number of T2D subjects in the FD group (n 60) were determined as AA, GA and GG. After 12 weeks, in FD compared with PD, serum 25(OH)D increased (+35·4 v. −4·8 nmol/l; P<0·001) and mean changes of waist circumference (WC; −1·3 v. +1·6 cm; P=0·02), body fat mass (FM; −1·9 v. +0·60 %; P=0·008), truncal fat (TF; −1·1 v. 0·13 %; P=0·003) and visceral adipose tissue (−0·80 v. +0·37 AU; P<0·001) decreased significantly. Circulating 25(OH)D was raised only in the AA group (34·8 nmo/l in AA group v. −6·4 nmol/l in AG and −1·6 nmol/l in GG groups; P<0·001), which was accompanied by a significant decrease in changes of WC (P=0·004), FM% (P=0·01) and TF% (P<0·001) in the AA genotype. Daily intake of vitamin D-FD for 12 weeks improved the central obesity indices in T2D subjects, and the improvement was more pronounced in the carriers of the AA genotype of VDR-Cdx-2.