NDLI: Effects of high fat diet-induced obesity on vitamin D metabolism and tissue distribution in vitamin D deficient or supplemented mice

Content Provider	Springer Nature : BioMed Central
Author	Park, Chan Yoon Shin, Yongho Kim, Jeong-Han Zhu, Shuang Jung, Young Sun Han, Sung Nim
Abstract	Background Vitamin D deficiency has been often observed in obese persons. One of the mechanisms suggested for low vitamin D status in obesity was decreased bioavailability of vitamin D (VD) due to sequestration in adipose tissue. However, only few studies have investigated this mechanism via quantifying vitamin D levels from tissues from the obese. Methods Six-wk-old C57BL/6 mice were fed 10 or 45% kcal fat (CON or HFD) diets containing 50, 1000 or 25,000 IU vitamin D3/kg diet (LVd, CVd or HVd) for 13 wks. Serum 25-hydroxyvitamin D (25(OH)D) levels were determined by radioimmunoassay and liver and adipose tissue cholecalciferol (VD3) and 25-hydrocholecalciferol (25(OH)D3) levels were measured by LC-MS/MS. mRNA levels of jejunal Mttp, Cd36, Sr-b1, Npc1l1, and Abca1 and liver and adipose tissue 25-hydroxylases (Cyp2r1 and Cyp27a1) were determined by real-time PCR. Results Serum 25(OH)D levels were affected by dietary vitamin D content but differential effects were observed between HFD and CON groups. When vitamin D intake was at a supplementary level, the HFD-HVd group had lower serum 25(OH)D levels than the CON-HVd group, while there was no significant difference between the HFD and CON groups fed LVd or CVd. Total amount of VD3 in liver and adipose tissue were significantly higher in HFD-HVd group compared with the CON-HVd group. However, no difference in total amount of tissue VD3 was observed between the CON and HFD groups fed CVd. In jejunum, mRNA levels of Mttp and Abca1 were significantly higher in HFD groups than CON groups. There was no difference in mRNA levels of liver 25-hydroxylases by both dietary fat amount and vitamin D content. Conclusion A significant amount of VD3 seemed to be stored in the liver and adipose tissue when dietary vitamin D is at a supplementation level; thus excess body adiposity could contribute to relatively low serum 25(OH)D level when vitamin D was supplemented.
Related Links	https://nutritionandmetabolism.biomedcentral.com/counter/pdf/10.1186/s12986-020-00463-x.pdf
Ending Page	12
Page Count	12
Starting Page	1
File Format	HTM / HTML
ISSN	17437075
DOI	10.1186/s12986-020-00463-x
Journal	Nutrition & Metabolism
Issue Number	1
Volume Number	17
Language	English
Publisher	BioMed Central
Publisher Date	2020-06-15
Access Restriction	Open
Subject Keyword	Clinical Nutrition Metabolic Diseases Vitamin D supplementation Obesity Tissue vitamin D 25-hydroxyvitamin D Vitamin D absorption
Content Type	Text
Resource Type	Article
Subject	Medicine Endocrinology, Diabetes and Metabolism Nutrition and Dietetics
Journal Impact Factor	3.9/2023
5-Year Journal Impact Factor	4.3/2023

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