Oleic acid stimulates HC11 mammary epithelial cells proliferation and mammary gland development in peripubertal mice through activation of CD36-Ca2+ and PI3K/Akt signaling pathway
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Yingying Meng1,2,*, Jing Zhang1,2,*, Cong Yuan1,2, Fenglin Zhang1,2, Qin Fu1,2, Han Su1,2, Xiaotong Zhu1,2, Lina Wang1,2, Ping Gao1,2, Gang Shu1,2, Qingyan Jiang1,2 and Songbo Wang1,2
1Guangdong Provincial Key Laboratory of Animal Nutrition Control, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
2National Engineering Research Center for Breeding Swine Industry and UBT Lipid Suite Functional Fatty Acids Research Center, South China Agricultural University, Guangzhou 510642, P. R. China
*These authors are co-first authors
Songbo Wang, email: firstname.lastname@example.org
Keywords: oleic acid (OA); mammary gland development; CD36-[Ca2+]i; PI3K/Akt; peripubertal mice
Received: October 21, 2017 Accepted: December 05, 2017 Published: January 12, 2018
This study aimed to investigate the effects of oleic acid (OA), a monounsaturated fatty acid, on HC11 mammary epithelial cells proliferation and peripubertal mammary gland development and explore the underlying mechanisms. HC11 cells and C57BL/6J mice were treated with OA. HC11 proliferation, peripubertal mammary gland development, and the involvement of CD36 and PI3K/Akt were assessed. In vitro, 100 μM OA significantly promoted HC11 proliferation by increasing Cyclin D1/3 and PCNA expression and decreasing p21 expression. Meanwhile, OA enhanced CD36 expression, elevated [Ca2+]i and activated PI3K/Akt signaling pathway. However, knockdown of CD36, chelation of [Ca2+]i or inhibition of PI3K eliminated the OA-induced promotion of HC11 proliferation and change in proliferative markers expression. In vivo, peripubertal exposure to diet containing 2% OA stimulated mammary duct development, with increased terminal duct end (TDE) and ductal branch. Moreover, dietary OA increased the serum levels of IGF-1 and E2, enhanced the expression of CD36 and Cyclin D1, and activated PI3K/Akt pathway in mammary glands. In conclusion, OA stimulated HC11 cells proliferation and mammary gland development in peripubertal mice, which was associated with activation of CD36-[Ca2+]i and PI3K/Akt signaling pathway. These data provided new insights into the stimulation of mammary gland development by dietary oleic acid.
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