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Linoleic Acid Decreases Leptin and Adiponectin Secretion from Primary Rat Adipocytes in the Presence of Insulin
Author(s) -
PérezMatute P.,
Martínez J. A.,
Marti A.,
MorenoAliaga M. J.
Publication year - 2007
Publication title -
lipids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.601
H-Index - 120
eISSN - 1558-9307
pISSN - 0024-4201
DOI - 10.1007/s11745-007-3092-y
Subject(s) - medicine , adiponectin , linoleic acid , endocrinology , leptin , insulin , fatty acid , adipokine , polyunsaturated fatty acid , fatty acid metabolism , biology , chemistry , metabolism , adipocyte , adipose tissue , insulin resistance , biochemistry , obesity
Obesity rates have dramatically increased over the last few decades and, at the same time, major changes in the type of fatty acid intake have occurred. Linoleic acid, an n‐6 polyunsaturated fatty acid, is an essential fatty acid occurring in high amounts in several western diets. A potential role of this fatty acid on obesity has been suggested. Controversial effects of linoleic acid on insulin sensitivity have also been reported. Thus, the aim of this study was to examine the direct effects of linoleic acid on leptin and adiponectin production, two adipokines known to influence weight gain and insulin sensitivity. Because insulin‐stimulated glucose metabolism is an important regulator of leptin production, the effects of linoleic acid on adipocyte metabolism were also examined. For this purpose, isolated rat adipocytes were incubated with linoleic acid (1–200 μM) in the absence or presence of insulin. Linoleic acid (1–200 μM) significantly decreased insulin‐stimulated leptin secretion and expression ( P < 0.05), however, no changes in basal leptin production were observed. Linoleic acid also induced a significant decrease (~20%) in adiponectin secretion ( P < 0.05), but only in the presence of insulin and at the highest concentration tested (200 μM). This fatty acid did not modify either glucose uptake or lactate production and the percentage of glucose metabolized to lactate was not changed either. Together, these results suggest that linoleic acid seems to interfere with other insulin signalling pathway different from those controlling glucose uptake and metabolism, but involved in the regulation of leptin and adiponectin production.