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Ascorbic acid enhances adipogenesis of 3T3-L1 murine preadipocyte through differential expression of collagens

Authors
Kim, ByoungjaeChoi, Kyung MinYim, Hong SoonLee, Min-Goo
Issue Date
11-12월-2013
Publisher
BMC
Keywords
Ascorbic acid; adipogenesis; 3T3-L1; collagens; differential expression
Citation
LIPIDS IN HEALTH AND DISEASE, v.12
Indexed
SCIE
SCOPUS
Journal Title
LIPIDS IN HEALTH AND DISEASE
Volume
12
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/101297
DOI
10.1186/1476-511X-12-182
ISSN
1476-511X
Abstract
Background: Adipogenesis from preadipocytes into mature adipocyte is precisely coordinated by transcription factors such as CCAAT-enhancer-binding proteins (C/EBPs) and peroxisome proliferator-activated receptor gamma (PPAR gamma), cytokines, and hormones, which is accompanied by extracellular matrix remodeling. Besides anti-oxidant activity, ascorbic acid (ASC) is participating in collagen biosynthesis and increase production and processing of collagens. Moreover, several studies demonstrated that ASC enhanced differentiation from preadipocytes into mature adipocytes. Methods: The adipogenic effect of ascorbic acid was evaluated in chemical induced 3T3-L1 by Oil Red O staining. This effect was elucidated by immunoblotting which detected the expression level of collagens and transcription factors in adipogenesis. The immunocytochemical determination of type I collagen was performed in 3T3-L1 adipocyte to show the change of extracellular matrix during adipogenesis. Results: In this study, Oil Red O staining in 3T3-L1 preadipocytes was increased dose-dependently by addition of ASC. These ASC-treated adipocytes increased collagen processing of alpha 1(I) and alpha 1(V) and expressed alpha 1(VI) and alpha 2(VI) collagens differentially. ASC also stimulated expression of C/EBP alpha and PPAR gamma, which is preceded by collagen enhancement. In addition, inhibition of ASC activity by ethyl-3,4-dihydroxybenzoate showed reduction of lipid accumulation by removal of large lipid droplets, not by inhibition of lipid production. This observation went with loss of alpha 1(I) deposition on adipocyte surface, increase of alpha 1(V) and alpha 2(VI) collagens and decrease of C/EBPs. Conclusion: Our findings imply that various actions of ASC on adipogenesis through differential collagen expression may provide diverse applications of ASC to adipose tissue technology.
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