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In vitro comparison of hepatic metaboliosm of 9cis-11 trans and 10trans-12cis isomers of CLA in the rat

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Lipids

Abstract

Hepatic metabolism of the two main isomers of CLA (9cis-11 trans, 10trans-12cisC18∶2) was compared to that of oleic acid (representative of the main plasma FA) in 16 rats by using the in vitro method of incubated liver slices. Liver tissue samples were incubated at 37°C for 17h under an atmosphere of 95% O2/5%CO2 in a medium supplemented with 0.75 mM of FA mixture (representative of circulating nonesterified FA) and with 55 μM [1-14C]9cis-11 trans C18∶2, [1-14C]10trans-12cis C18∶2, or [1-14C]oleate. The uptake of CLA by hepatocytes was similar for both isomers (9%) and was three times higher (P<0.01) than for oleate (2.6%). The rate of CLA isomer oxidation was two times higher (49 and 40% of incorporated amounts of 9cis-11 trans and 10trans-12 cis, respectively) than that of oleate (P<0.01). Total oxidation of oleate and CLA isomers into [14CO2] was low (2 to 7% of total oxidized FA) compared to the partial oxidation (93 to 98%) leading to the production of [14C] acid-soluble products. CLA isoemrs escaping from catabolism were both highly desaturated (26.7 and 26.8%) into conjugated 18∶3. Oleate and CLA isomers were mainly esterified into neutral lipids (30%). They were slowly secreted as parts of VLDL particles (<0.4% of FA incorporated into cells), the extent of secretion of oleate and of 10trans-12 cis being 2.2-fold higher than that of 9cis-11 trans (P<0.02). In conclusion, this study clearly showed that both CLA isomers were highly catabolized by hepatocytes, reducing their availability for peripheral tissues. Moreover, more than 25% of CLA escaping from catabolism was converted into conjugated 18∶3, the biological properties of which remain to be elucidated.

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Abbreviations

ASP:

acid-soluble products

CEA:

Commissariat à l’Energie Atomique

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Authors and Affiliations

  1. Research Unit on Herbivores, Nutrients and Metabolisms Group, Institut National de la Recherche Agronomique (INRA), 63122, Saint Genès-Champanelle, France

    Dominique Gruffat, Anne De La Torre, Denys Durand & Dominique Bauchart

  2. Lipid Nutrition Unit, INRA Dijon, 21065, Dijon, France

    Jean-Michel Chardigny & Jean-Louis Sébédio

  3. Commissariat à l’Energie Atomique (CEA) Saclay, 91191, Gif/Yvette Cedex, France

    Olivier Loreau

Authors
  1. Dominique Gruffat
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  2. Anne De La Torre
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  3. Jean-Michel Chardigny
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  4. Denys Durand
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  6. Jean-Louis Sébédio
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  7. Dominique Bauchart
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Correspondence to Dominique Gruffat.

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Gruffat, D., De La Torre, A., Chardigny, JM. et al. In vitro comparison of hepatic metaboliosm of 9cis-11 trans and 10trans-12cis isomers of CLA in the rat. Lipids 38, 157–163 (2003). https://doi.org/10.1007/s11745-003-1046-4

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  • DOI: https://doi.org/10.1007/s11745-003-1046-4

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