DGIST’s research team led by Dr Yun-Il Lee in Well Aging Research Center has identified a new mecha­nism of inhibition of dopaminergic neuronal apoptosis and suggested the possibility of preventing and treating Parkinson’s disease.

Parkinson’s disease (PD) is a typical degenerative brain disease caused by the death of dopaminer­gic neurons in the middle cerebral blood. It is a disease with a higher incidence in the population aged 60 or older, exhibiting symptoms such as tremor, stiffness, slow motion and postural instability.

In particular, as the majority of Parkinson’s patients suffer from the progressive neurodegenerative disease, many researchers newly started to focus on cell death, a loss of dopamine-producing neurons, to treat PD.

With regard to the cell death process, in vivo cell stress and damages activate PARP-1 (Poly ADP-ribose polymerase-1) and induce excessive accumulation of PAR (Poly ADP-ribose) and those activities activate AIF (Apoptosis- Inducing Factor), a factor that induces cell death, and destroy DNA.

This new mechanism of cell death (Parthanatos) has recently been known as the cause of degenerative brain diseases such as Parkinson’s disease, stroke, heart attack, dia­betes, etc. and the mechanism has been extensively studied as previous research to treat these diseases.

Currently, medications are being used to alleviate symptoms of Parkinson’s disease. However, there are no government-approved drugs that can inhibit dopaminergic neu­ronal cell death. Then, the research teams have found the possibility in liquorice, the herb medicine.

Yun-Il Lee carried out joint research with Professor Joo-Ho Shin and Professor Yunjong Lee from Sungkyunkwan University School of Medicine to study candi­date compounds for the treatment of Parkinson’s disease.

For example, the researchers have identified the mechanism that cortisol, a stress hormone, promotes dopaminergic neuronal activity by inducing parkin protein expression that inhibits dopamine neuronal cell death.

In this study, the research teams found the candidate drugs that induce the expression of RNF146 protein involved in the inhibition of neuronal cell death through high-speed mass screening method using the natural materials library of the Natural Medicine Bank of Korea Foundation.

As a result, the study has con­firmed that liquiritigenin, a liquorice extract, induces the expression of RNF146 protein and removes exces­sively accumulated PAR binding and modified substrate proteins using the ubiquitin-proteasome system and results in inhibition of dopa­mine neuronal cell death.

In addition, the research teams have been working on identify­ing the mechanism which induces liquiritigenin’s RNF146 protein expression and demonstrated that it regulates transcription through binding and activity with estro­gen receptors in cell and animal models.

Consequently, it has been scien­tifically proved that liquiritigenin, a liquorice extract, can be used as a treatment for degenerative Par­kinson’s disease.