In vitro characterization and endocrine regulation of cholesterol and phospholipid transport in the mammary gland.

Ontsouka, Edgar; Huang, Xiao; Aliyev, Eldar; Albrecht, Christiane (2017). In vitro characterization and endocrine regulation of cholesterol and phospholipid transport in the mammary gland. Molecular and cellular endocrinology, 439, pp. 35-45. Elsevier Ireland 10.1016/j.mce.2016.10.016

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Cell-based studies previously showed that the ATP-binding cassette transporter A1 (ABCA1) transfers cholesterol across mammary epithelial cells (MEC). Data for phospholipid transport are lacking, and it is unclear from which cellular source the transported cholesterol stems, whether this transport activates signaling pathways, and how lactogenic hormones regulate it. To clarify these aspects, lipid transport and expressional analyses were performed in bovine primary (bMEC) and/or immortalized (MAC-T) MEC cultures. Lipid efflux and ABCA1, ABCG1 and liver X receptorα mRNA levels were higher in MAC-T than bMEC. In MAC-T, the transported cholesterol originated mainly from the plasma membrane. ABCA1 dependent cholesterol efflux was higher than phosphatidylcholine efflux, was suppressed by probucol (ABCA1 inhibitor), AG490 (janus kinase-2 inhibitor), PD98059 (mitogen activated protein kinase kinase inhibitor) and pretreatment with β-cyclodextrin (lowering membrane cholesterol). Insulin was the only hormone significantly increasing cholesterol efflux. In conclusion, this study gives novel mechanistic and regulatory insights into the transport of cholesterol and phospholipids in MEC.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Other Institutions > NCCR TransCure
04 Faculty of Medicine > Pre-clinic Human Medicine > Institute of Biochemistry and Molecular Medicine

UniBE Contributor:

Ontsouka, Edgar; Huang, Xiao; Aliyev, Eldar and Albrecht, Christiane

Subjects:

500 Science > 570 Life sciences; biology
600 Technology > 610 Medicine & health

ISSN:

0303-7207

Publisher:

Elsevier Ireland

Language:

English

Submitter:

Barbara Järmann-Bangerter

Date Deposited:

17 Jul 2017 15:09

Last Modified:

17 Jul 2017 15:09

Publisher DOI:

10.1016/j.mce.2016.10.016

PubMed ID:

27760380

Uncontrolled Keywords:

Apolipoprotein A-1; Cholesterol; Efflux; Hormone; Phospholipid; Regulation; Transport

BORIS DOI:

10.7892/boris.93989

URI:

https://boris.unibe.ch/id/eprint/93989

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