Stem Cell Secretome as an Emerging Treatment

for Parkinson’s Disease

FRIDAY, 10 MAY 2019 | Nina Klein

Stem Cell Secretome as an Emerging Treatment for Parkinson’s Disease

Parkinson's Disease (PD) is a chronic nervous system disorder that affects the patient’s movement. Symptoms will usually start gradually, with tremors being the most common symptom, but the disorder can also cause stiffness or slowed down movement.

A certain genetic predisposition in combination with environmental factors are most likely responsible for the neuronal degeneration that causes Parkinson’s Disease. It is thought that several factors on a cellular level, including mitochondrial dysfunction, oxidative stress and a dysfunctional protein degradation machinery, play a crucial role in PD.

To date, there is no cure for Parkinson’s Disease. Current available therapeutic strategies do not impact the progression, merely help with the symptoms and can cause severe side effects. This makes novel treatments for PD an urgent necessity. Cellular dopamine-replacement approaches have been proposed as the basis for PD therapies thirty years ago1, but results were not consistent. The use of stem cells has arisen as an encouraging approach, given their regenerative, self-renewing and anti-apoptotic nature. Within the scope of a replacement strategy, different types of stem cell sources appear promising, amongst them mesenchymal stem cells, embryonic stem cells, induced pluripotent stem cells and neural stem cells.

Current research strongly suggests that the effectiveness of stem cells does not come from the cells themselves, but their secreted components in form of microvesicles or exosomes2. The sum of all secreted compounds, called the Stem Cell Secretome, is accepted as the main therapeutic force. A recent scientific review article3 summarized the ongoing clinical trials and other research efforts that investigate Stem Cell Implantation and Stem Cell Secretome Therapy for PD. While long-term data is still lacking, the results are very encouraging, and show the magnificent potential of cell secretome as a cell-free treatment alternative for PD.

The authors further argue that a full characterization of the secretome, as well as disease-specific modulation of the secretome are the necessary next steps to further advance this therapeutic approach. In combination with other treatments, it may then be possible to significantly improve the state-of-the-art treatment options of Parkinson’s Disease.

References:

  1. Parmar M, Torper O, Drouin-Ouellet J. Cell-based therapy for Parkinson’s disease: a journey through decades toward the light side of the force. Eur J Neurosci. 2018;55:4763–4776.
  2. Teixeira, F. G., Carvalho, M. M., Sousa, N., & Salgado, A. J. (2013). Mesenchymal stem cells secretome: a new paradigm for central nervous system regeneration?. Cellular and Molecular Life Sciences, 70(20), 3871-3882.
  3. Marques, C. R., Marote, A., Mendes-Pinheiro, B., Teixeira, F. G., & Salgado, A. J. (2018). Cell secretome based approaches in Parkinson’s disease regenerative medicine. Expert opinion on biological therapy, 18(12), 1235-1245.

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