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Decreased production of inflammatory mediators in human osteoarthritic chondrocytes by conjugated linoleic acids

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Lipids

Abstract

Osteoarthritic chondrocytes (OC) produce excessive prostaglandin E2 (PGE2) and nitric oxide (NO), which function as inflammation mediators in the pathogenesis of osteoarthritis (OA). This study examined the effect of CLA alone and in combination with other PUFA on the FA composition and the production of PGE2 and NO in OC cultures isolated from OA patients. Human OC were grown in monolayer and treated with one of the following PUFA treatments: CLA, CLA+arachidonic acid (CLA/AA), CLA_EPA (CLA/EPA), linoleic acid (LA), LA+AA (LA/AA), LA+EPA (LA/EPA), and ethanol (as a vehicle control) at 10 and 20 μM for 6 d. Supplementation of PUFA at 10 μM for 6 d did not introduce any cytotoxic effects or morphological changes in OC, whereas 20 μM resulted in apoptosis. Cultures of OC treated with CLA, CLA/AA, and CLA/EPA had higher concentrations of CLA isomers, and these isomers were not detected in other treatments. Supplementation of CLA or LA alone to the OC led to a lower PGE2 production compared to the control. Combination of CLA/EPA resulted in the lowest PGE2 production in cultured OC. OC cultures treated with CLA were lower in NO production than the control, whereas the LA/AA treatment demonstrated the lowest NO production. The fact that CLA alone or in combination with other PUFA modulated PGE2 and NO production in human OC cultures suggests that these 18∶2 isomers may have the potential to influence OA pathogenesis.

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Abbreviations

AA:

arachidonic acid

COX:

cyclooxygenase

5-HETE:

5-hydroxyeicosatetraenoic acid

IL:

interleukin

iNOS:

inducible nitric oxide synthase

LA:

linoleic acid

LnA:

α-linolenic acid

LPS:

lipopolysaccharides

LT:

leukotriene

NO:

nitric oxide

OA:

osteoarthritis

OC:

osteoarthritic chondrocytes

PGE2 :

prostaglandin E2

PPARγ:

peroxisome proliferator-activated receptor γ

TNF-α:

tumor necrosis factor-α

TX:

thromboxane

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Authors and Affiliations

  1. Department of Orthopedic Surgery, Texas Tech University Health Sciences Center, 79430, Lubbock, Texas

    Jack H. Henry

  2. Lipid Chemistry and Molecular Biology Laboratory, Department of Food Science, Purdue University, 47907, West Lafayette, Indiana

    Yong Li & Bruce A. Watkins

  3. Department of Pathology, Texas Tech University Health Sciences Center, 3601 Fourth St., 79430, Lubbock, TX

    Chwan-Li Shen & Dale M. Dunn

Authors
  1. Chwan-Li Shen
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  2. Dale M. Dunn
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  3. Jack H. Henry
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  4. Yong Li
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Correspondence to Chwan-Li Shen.

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Shen, CL., Dunn, D.M., Henry, J.H. et al. Decreased production of inflammatory mediators in human osteoarthritic chondrocytes by conjugated linoleic acids. Lipids 39, 161–166 (2004). https://doi.org/10.1007/s11745-004-1214-6

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  • DOI: https://doi.org/10.1007/s11745-004-1214-6

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