Effect of -Lipoic Acid on Proteasomal Induction: Protection against Oxidative Damage in Human Skin Fibroblasts Cell Line NHDF — Oak Academic Publishing
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Effect of -Lipoic Acid on Proteasomal Induction: Protection against Oxidative Damage in Human Skin Fibroblasts Cell Line NHDF
Laboratoire de Chimie Bioanalytique, Toxicologie et Chimie Physique Appliquée, Faculté de Pharmacie, Université Libre de Bruxelles (ULB), Brussels, Belgium
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Laboratoire de Chimie Bioanalytique, Toxicologie et Chimie Physique Appliquée, Faculté de Pharmacie, Université Libre de Bruxelles (ULB), Brussels, Belgium
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Laboratoire de Chimie Bioanalytique, Toxicologie et Chimie Physique Appliquée, Faculté de Pharmacie, Université Libre de Bruxelles (ULB), Brussels, Belgium
1 Laboratoire de Chimie Bioanalytique, Toxicologie et Chimie Physique Appliquée, Faculté de Pharmacie, Université Libre de Bruxelles (ULB), Brussels, Belgium
2 Laboratoire de Chimie Bioanalytique, Toxicologie et Chimie Physique Appliquée, Faculté de Pharmacie, Université Libre de Bruxelles (ULB), Brussels, Belgium
3 Laboratoire de Chimie Bioanalytique, Toxicologie et Chimie Physique Appliquée, Faculté de Pharmacie, Université Libre de Bruxelles (ULB), Brussels, Belgium
As human skin is daily exposed to oxidative stress causing various unesthetical abnormalities, the road to effective anti-aging substances is being widely investigated. 20S proteasome is a key pathway in the breakdown of oxidized proteins. But its activity declines dramatically in aging cells. Nrf2 inducers -lipoic acid (LA) and sulforaphane (SFN) have been described in the dietary industries for their antioxidant effects on various cell lines. However, since little is yet known about LA’s capacity to protect skin cells from premature and extrinsic aging; our aim was to demonstrate the beneficial effect of LA on the cellular detoxification systems. On this purpose, we evaluated its effects against injuries induced by H 2 O 2 in NHDF and its likely positive effect on the chymotrypsin-like (CT-like) activity of 20S proteasome, using SFN as a reference. The cellular content in proteins was measured, as well as the production of Reactive Oxygen Species (ROS). Also, the induction of the proteasomal protein expression was investigated. The results show that after 48 h treatment, LA significantly decreased the percentage of ROS positive cells. Also, LA decreased the level of H 2 O 2 -induced carbonylated proteins and increased the proteasomal activity. Furthermore, LA upregulated the expression of the 20S proteasome ß -subunit responsible for the CT-like activity (PSMB5). Overall, both molecules enhanced cell proliferation over 8 days. So, our investigation found evidence of the higher capacity of LA to induce 20S proteasome activity with less toxicity in human fibroblasts compared to reference molecule SFN. These results tend to demonstrate that the induction of the proteasomal activity might be a part of the antioxidant potential of LA. To our knowledge, this is the first study to elucidate the capacity of LA to activate detoxification systems in human cell lines through the induction of 20S proteasome.
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