Premium
Up‐regulation of hepatic lipolysis stimulated lipoprotein receptor by leptin: a potential lever for controlling lipid clearance during the postprandial phase
Author(s) -
Stenger Christophe,
Hanse Marine,
Pratte Dagmar,
Mbala MarieLudvine,
Akbar Samina,
Koziel Violette,
Escanyé MarieChristine,
Kriem Badreddine,
MalaplateArmand Catherine,
Olivier JeanLuc,
Oster Thierry,
Pillot Thierry,
Yen Frances T.
Publication year - 2010
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fj.10-160440
Subject(s) - postprandial , leptin , endocrinology , medicine , leptin receptor , lipolysis , ldl receptor , lipoprotein , receptor , chemistry , adipose tissue , biology , cholesterol , insulin , obesity
As a hepatic receptor for triglyceriderich lipoproteins, the lipolysis‐stimulated lipoprotein receptor (LSR) may be involved in the dynamics of lipid distribution between the liver and peripheral tissues. Here, we explore the potential role of leptin in regulating LSR. At physiological concentrations (1–10 ng/ml), leptin increased LSR protein and mRNA levels in Hepa1–6 cells through an ERK1/2‐dependent and α‐amanitin‐sensitive pathway. In vivo , leptin treatment of C57BL6/Rj mice (1 µg2×/d, 8 d) led to a significant increase in hepatic LSR mRNA and protein, decreased liver triglycerides and increased VLDL secretion as compared to controls. LSR +/− mice with elevated postprandial lipemia placed on a high‐fat (60% kcal) diet exhibited accelerated weight gain and increased fat mass as compared to controls. While plasma leptin levels were increased 3‐fold, hepatic leptin receptor protein levels and phosphorylation of ERK1/2 were significantly reduced. Therefore, leptin is an important regulator of LSR protein levels providing the means for the control of hepatic uptake of lipids during the postprandial phase. However, this may no longer be functional in LSR +/− mice placed under a chronic dietary fat load, suggesting that this animal model could be useful for the study of molecular mechanisms involved in peripheral leptin resistance.—Stenger, C., Hanse, M., Pratte, D., Mbala, M.‐L., Akbar, S., Koziel, V., Escanyé, M.‐C., Kriem, B., Malaplate‐Armand, C., Olivier, J.‐L., Oster, T., Pillot, T., Yen, F. T. Up‐regulation of hepatic lipolysis stimulated lipoprotein receptor by leptin: a potential lever for controlling lipid clearance during the postprandial phase. FASEB J . 24, 4218–4228 (2010). www.fasebj.org