Open AccessKnockdown of ubiquitin D inhibits adipogenesis during the differentiation of porcine intramuscular and subcutaneous preadipocytes
Author(s) -
Zhao Chen,
Yao Xiangping,
Chen Xiaochang,
Wu Wenjing,
Xi Fengxue,
Yang Gongshe,
Yu Taiyong
Publication year - 2018
Publication title -
cell proliferation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.647
H-Index - 74
eISSN - 1365-2184
pISSN - 0960-7722
DOI - 10.1111/cpr.12401
Subject(s) - gene knockdown , adipogenesis , cell growth , pi3k/akt/mtor pathway , small interfering rna , microbiology and biotechnology , flow cytometry , downregulation and upregulation , chemistry , cell , adipose tissue , cell cycle , transfection , biology , endocrinology , signal transduction , biochemistry , apoptosis , gene
Objectives Intramuscular fat ( IMF ) has a significant influence on porcine meat quality. Ubiquitin D ( UBD ) is involved in the management of diverse intracellular processes. However, its physiological functions in adipose cell differentiation and proliferation are still poorly defined. Materials and methods Intramuscular and subcutaneous preadipocytes were isolated from the longissimus dorsi and neck subcutaneous deposits of Chinese native Guanzhong Black piglets (3‐5 days old), respectively. Lentivirus with short hairpin RNA (sh RNA ) for UBD was applied to knockdown UBD expression. We used real‐time PCR and Western blot analysis to detect gene expression. Lipid droplets were dyed with Oil Red O, and cell proliferation was assessed using flow cytometry, 5‐ethynyl‐2′‐deoxyuridine incorporation and cell counting assays. Results Lipogenesis through the Akt/ mTOR pathway was inhibited when preadipocytes were transfected with UBD sh RNA . The expression of adipogenic genes and the number of lipid droplets were obviously diminished. Moreover, repression of UBD attenuated cell proliferation. UBD downregulation resulted in cell cycle arrest because of a decreased proportion of S‐phase cells, and the expression of positive cell proliferation markers was significantly decreased. Conclusion These observations illustrated that knockdown of UBD partially suppressed porcine intramuscular and subcutaneous preadipocyte adipogenesis through the Akt/ mTOR signalling and inhibited cell proliferation, suggesting the essential role of UBD in the differentiation of preadipocytes.