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Background  Mixed CLA isomers variably affect bone resorption in animals and decrease osteoclast formation and activity in murine osteoclasts. These variable effects may be due to the different isomers present in commercial preparations of CLA, and the effects of the predominant individual isomers, 9 cis ,11 trans  (9,11) and 10 trans ,12 cis  (10,12) CLA are not clear. The objectives of this study were to determine the effects of the individual CLA isomers on osteoclast formation and activity from human CD14 +  monocytes, and to determine whether any changes are accompanied by changes in cathepsin K, matrix metalloproteinase-9 (MMP-9), receptor activator of NF-κB (RANK) and tumour necrosis factor alpha (TNFα) gene expression. Osteoclasts were identified as TRAP +  multinucleated cells. Osteoclast activity was quantified by the amount of TRAP in the cultured media.    Results  At 50 μM, 9,11 CLA inhibited osteoclast formation by ~70%, and both 9,11 and 10,12 CLA decreased osteoclast activity by ~85–90%. Both isomers inhibited cathepsin K (50 μM 9,11 by ~60%; 10,12 by ~50%) and RANK (50 μM 9,11 by ~85%; 50 μM 10,12 by ~65%) expression, but had no effect on MMP-9 or TNFα expression.    Conclusion  9,11 CLA inhibits osteoclast formation and activity from human cells, suggesting that this isomer may prevent bone resorption in humans. Although 10,12 CLA did not significantly reduce osteoclast formation, it reduced osteoclast activity and cathepsin K and RANK expression, suggesting that this isomer may also affect bone resorption.

Effects of 9cis,11trans and 10trans,12cis CLA on osteoclast formation and activity from human CD14+ monocytes