Abstract
Background
The molecular nature of lipoic acid (LA) clarifies its capability of taking part to a variety of biochemical reactions where redox state is meaningful. The pivotal action of LA is the antioxidant activity due to its ability to scavenge and inactivate free radicals. Furthermore, LA has been shown to chelate toxic metals both directly and indirectly by its capability to enhance intracellular glutathione (GSH) levels. This last property is due to its ability to interact with GSH and recycle endogenous GSH. LA exhibits significant antioxidant activity protecting against oxidative damage in several diseases, including neurodegenerative disorders. Interestingly, LA is unique among natural antioxidants for its capability to satisfy a lot of requirements, making it a potentially highly effective therapeutic agent for many conditions related with oxidative damage. In particular, there are evidences showing that LA has therapeutic activity in lowering glucose levels in diabetic conditions. Similarly, LA supplementation has multiple beneficial effects on the regression of the mitochondrial function and on oxidative stress associated with several diseases and aging.
Aim
The aim of the present review is to describe the molecular mechanisms underlying the beneficial effects of LA under various experimental conditions and disease and how to exploit such effect for clinical purposes.
Conclusion
LA has pleiotropic effects in different pathways related with several diseases, its use as a potential therapeutic agent is very promising.
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Abbreviations
- LA:
-
Lipoic acid
- DHLA:
-
Dihydrolipoic acid
- R-LA or (+)LA:
-
R-enantiomer lipoic acid
- S-LA or (-)LA:
-
S-enantiomer lipoic acid
- (±)LA:
-
Raceme lipoic acid
- ROS:
-
Reactive oxygen species
- RNS:
-
Reactive nitrogen species
- SOD:
-
Superoxide dismutase
- GSH:
-
Glutathione
- GSSG:
-
Disulfide form of glutathione
- MAPK:
-
Mitogen activated protein Kinases
- PI3-K:
-
Phosphatidyl inositide 3-kinase
- αGPC:
-
l-α-glycerylphosphorylcholine
- GPCR:
-
G protein coupled receptor
- ERK:
-
Extracellular regulated Kinases
- JNK:
-
c-Jun N-terminal kinase
- AKT:
-
The protein kinase B
- NF-kB:
-
Nuclear factor-KB
- IGF-1:
-
Insulin-like growth factor-1
- IR:
-
Insulin receptor
- IRS1:
-
Insulin receptor substrate 1
- IRS-1:
-
Insulin receptor substrate-1
- AMPK:
-
5′ Adenosine monophosphate-activated protein kinase
- PTP1B:
-
Cellular protein tyrosine phosphatases
- LKB-1:
-
Liver kinase B1
- CaMKK:
-
Ca/calmodulin dependent protein kinase
- PGC-1-alpha:
-
Proliferator activated receptor-gamma coactivator-1alpha
- EAE:
-
Experimental autoimmune encephalomyelitis
- AD:
-
Alzheimer’s disease
- AChE:
-
Acetylcholinesterase
- AGEs:
-
Advanced glycation end product
- HNE:
-
4-Hydroxy-2-nonenal
- PKC:
-
Protein kinase C
- GLUT:
-
Glucose transport protein
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The authors acknowledged pharmaceutical MDM S.p.A. Via Volturno, 29/b—20900 Monza (MB), Italy, e-mail: mdm@mdmspa.com.
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All authors had full access to all the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: RA and VB. Managing the literature searches: DT, SG, CG, DT. Drafting of the manuscript: RA and VB. Critical revision of the manuscript: DT, CG, CDA, GL, GLV, FA, RA and VB. Administrative and technical support: CG, DT. Supervision of the study: DT, RA and VB. Approving the final draft of manuscript: all the authors.
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Tibullo, D., Li Volti, G., Giallongo, C. et al. Biochemical and clinical relevance of alpha lipoic acid: antioxidant and anti-inflammatory activity, molecular pathways and therapeutic potential. Inflamm. Res. 66, 947–959 (2017). https://doi.org/10.1007/s00011-017-1079-6
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DOI: https://doi.org/10.1007/s00011-017-1079-6