High expression of cell death-inducing DFFA-like effector a (CIDEA) promotes milk fat content in dairy cows with clinical ketosis

Published on Feb 1, 2019in Journal of Dairy Science3.333
· DOI :10.3168/JDS.2018-15439
Xudong Sun7
Estimated H-index: 7
(JLU: Jilin University),
Yazhe Wang6
Estimated H-index: 6
(JLU: Jilin University)
+ 8 AuthorsXinwei Li23
Estimated H-index: 23
(JLU: Jilin University)
ABSTRACT High blood concentrations of nonesterified fatty acids (NEFA) during ketosis represent a source of fatty acids for milk fat synthesis and explain the increase in milk fat content in ketotic cows. Cell death-inducing DFFA-like effector a (CIDEA) is a lipid droplet coat protein with important roles in the regulation of milk fat synthesis and secretion in mice. Whether ketosis alters the expression of CIDEA in mammary gland tissue and the extent to which it may contribute to regulation of milk fat synthesis and secretion are unknown. Mammary gland tissue and blood samples were collected from healthy (n = 15) and clinically ketotic (n = 15) cows. Mammary epithelial cells isolated from cows were infected with CIDEA overexpression adenovirus for 48 h, treated with 0, 0.3, 0.6, or 1.2 mM NEFA for 24 h, or infected with CIDEA-silencing adenovirus for 48 h and treated with 1.2 mM NEFA for 24 h. Serum concentrations of NEFA and β-hydroxybutyrate were greater in cows with clinical ketosis, and milk production and dry matter intake were lower in cows with clinical ketosis. However, compared with healthy cows, the content of milk fat of cows with clinical ketosis was greater. Compared with healthy cows, abundance of mRNA and protein of CIDEA, fatty acid synthase (FASN), acetyl-coA carboxylase 1 (ACACA), butyrophilin (BTN1A1), and xanthine dehydrogenase (XDH) was greater in mammary tissue of cows with clinical ketosis. Overexpression of CIDEA in cultured mammary epithelial cells increased the abundance of FASN, ACACA, XDH, and BTN1A1, and increased triacylglycerol (TAG) content in mammary epithelial cells. Exogenous NEFA increased the abundance of CIDEA, FASN, ACACA, XDH, and BTN1A1, and increased TAG content in mammary epithelial cells. Importantly, knockdown of CIDEA reversed the upregulation of FASN, ACACA, XDH, and BTN1A1 abundance and TAG content induced by NEFA treatment. Overall, these data suggest that high levels of NEFA stimulate the expression of CIDEA and enhance de novo fatty acid synthesis and milk fat secretion. As such, these mechanisms explain in part the elevation of milk fat content in dairy cows with clinical ketosis.
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