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Stem Cells Show Promise for Alzheimer’s and Parkinson’s Disease

## Mesenchymal stem cell-derived exosomes as a promising therapy for Parkinson's and Alzheimer's Disease. Recently, investigators suggested using Mesenchymal stem cells (MSCs)–derived exosomes as a therapy for different conditions, including Parkinson's Disease (PD).[1,2,5] MSCs can be found in various body parts and specialize in different cell types depending on the body's needs.[1] These cells produce extracellular vesicles called exosomes that have been studied as an alternative medicin

Stem Cells Show Promise for Alzheimer’s and Parkinson’s Disease

Mesenchymal stem cell-derived exosomes as a promising therapy for Parkinson's and Alzheimer's Disease.

Recently, investigators suggested using Mesenchymal stem cells (MSCs)–derived exosomes as a therapy for different conditions, including Parkinson's Disease (PD). [1,2,5] MSCs can be found in various body parts and specialize in different cell types depending on the body's needs. [1] These cells produce extracellular vesicles called exosomes that have been studied as an alternative medicinal agent because of their stability and biological prospect in terms of the substances they carry, like signaling molecules, cytokines, enzymes, and micro-RNA (miRNA). [1,2,4] All these components are essential in maintaining cellular homeostasis, while the miRNA is more involved in regulating gene expression. [1,2,4] Many studies with MSCs have demonstrated several benefits in other neuropathological conditions. [1] One of the insights is that the MSCs have been pointed to activate different neuro-regeneration processes, opening a door for many possible ways to serve as promising therapies for future clinical trials. [1,3] Two targets for developing new treatments using MSCs are PD and Alzheimer's disease (AD). [2,3,4,7] PD is characterized by the deterioration of dopaminergic neurons and the insufficiency of dopamine production. [3,6,9] Generally, the decrease of dopaminergic neurons is related to the accumulation of Lewy bodies (protein aggregates of α-synuclein) inside the neurons, which affects the normal functioning of those cells. [9] Interestingly, MSCs-derived exosome seems to be able to decrease one of the leading causes of PD, neuroinflammation. [2,5,10] On the other hand, AD is described as a brain illness that presents as neurological hallmarks the formation of amyloid plaques (Aβ) and neurofibrillary tangles causing synaptic loss. [4,7,12]

One principal characteristic that makes MSCs so promising is their availability in the human body (brain, adipose tissue, dental pulp, bone marrow, placenta, and the umbilical cord). [1] However, it is vital to address that although all these cell populations are defined as MSCs, they present differences, especially in their antigen markers composition. [1] For this reason, several studies show differences in each MSCs isolation, cell culture, and expansion protocols. [1] MSCs release a product called secretomes into the extracellular space, composed of chemokines, growth factors, cytokines, extracellular vesicles, and proteins that promote neuroprotection, neural differentiation, and the decrease of neuroinflammation. [1,2,8] This characteristic makes the MSC-secretome a promising therapeutic option for treating neurodegenerative disorders. [1] Several investigations have demonstrated remarkable MSCs' capacity to cross the blood-brain barrier (BBB), long half-life, and low immunogenicity. [1,7,8] Also, some research shows an inflammation reduction after MSCs-derived exosome administration in a traumatic brain injury model. [2,5] In addition, the MSCs-derived exosome injection promotes neuro-regeneration and reduces inflammation in rat models after injury. [1,2,5] Also, MSCs promote neuroprotection, neural differentiation, and immunomodulation after intracranial transplantation. [1,2,5] Even though the MSCs-derived exosomes have many benefits, the most relevant insight demonstrated by several studies is their high levels of an amyloid β-degrading enzyme (neprilysin), which decrease Aβ levels, thus having an incredible impact on slowing the Alzheimer'sAlzheimer's disease progression.[4,7,8,12] Also, evidence suggests an essential role of autophagy in AD, where dysfunction in this system can lead to Aβ accumulation. [8,13,14] MSCs have been tested in vivo and in vitro AD models where the administration of MSCs has increased autophagy meaningfully, thus reducing the Aβ levels and increasing neuron survival. [13] MSCs demonstrate to improve neurogenesis and enhance memory deficits in both animal and cellular models of AD. [8,13]

On the other hand, MSC can communicate and diffuse MSC-secretome with nearby cells like neurons. [1,4] This is important since it raises the chances of a noninvasive treatment administration and the delivery of molecules of interest using an easy and more direct route. [1,15] The differentiation ability into various neurons shows that MSC can replace dead cells, especially in affected regions (see Figure1). [15] Other MSCs-derived exosome components described in many articles, like miR-143 and miR-21, have a crucial role in immune response modulation and neuronal death related to chronic inflammation (see Figure1). [15] Also, MSCs-derived exosomes help modulate neurogenesis, axonal growth, and CNS recuperation. [15] In PD mice models, MSCs-derived exosomes cause behavioral improvements and suppress some of the α-synuclein components in its pathway, decreasing α-synuclein production. [15] There are different routes for MSC administration in PD treatment. [15] The first one is the direct transplantation of these cells into the affected location. [8,15] This technique has shown advantageous outcomes, especially in the subthalamic nucleus, substantia nigra, and striatum. [8,15] Recent studies discover the MSC's capacity to migrate to injury locations, promoting repair. [8,12,15] This finding expands the MSC administration, and new noninvasive methods like intranasal administration are also available, showing promising results. [1,15] Preclinical PD models using intranasal administration demonstrated the effective delivery of MSCs to brain areas like the olfactory bulb, hippocampus, striatum, cerebellum, brain stem, amygdala, and spinal cord even four months after the injection (see Table 1 & 2). [3,5] Even though there is a lot of good data from in vitro and in vivo models, only a few clinical studies for AD are currently listed in the National Institutes of Health clinical trials database (see Table 3). [4] Only one clinical trial was approved to analyze the safety and effectiveness of MSC-derived in humans with mild to moderate dementia (NCT04388982). [4]

Appendix

Table 1. Clinical Trials Using Mesenchymal Stem Cells for Treatment of Parkinson Disease (Clinicaltrials.gov)

Figure 1. Schematic representation of the active role of exosomes on PD

Table 2. Clinical trials undertaken with MSCs in neural repair (www://ClinicalTrials.org)

Table 3. Summary of preclinical studies of MSC-derived EVs-based therapy both in vitro and in vivo models of AD

References

Posted in: Stem Cell Research Neurogenesis Alzheimer's Research Parkinson's Research

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Our collection and/or use of any information you provide while using or visiting this Web Site is governed by the Privacy Policy and this Terms and Conditions of Use Agreement. By using this Web Site you grant us the rights contained therein. In using this Web Site you may not upload, distribute, or otherwise publish on this Web Site any information which may be viewed as obscene, defamatory, libelous, threatening, abusive, illegal, an invasion of privacy rights, or otherwise objectionable, or may constitute or encourage a violation of any law.

Except for that individually-identifiable information collected from you in accordance with our Privacy Policy, all comments, remarks, suggestions, ideas or other information communicated will become the exclusive property of and you grant to a royalty-free, perpetual, irrevocable, world-wide, non-exclusive license to use or reproduce the same. is free to copy, disclose, distribute or analyze any such information for any and all purposes and are in no way obligated to compensate you for any such information.

Disclaimer of Warranties

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TO THE FULL EXTENT NOT PRECLUDED BY APPLICABLE LAW THEIR MEDICAL ADVISORS, SUPPLIERS, CONSULTANTS, DIRECTORS AND EMPLOYEES DISCLAIM AND EXCLUDE ALL WARRANTIES WITH RESPECT TO ALL CONTENT, EXPRESS, IMPLIED OR STATUTORY. THIS DISCLAIMER INCLUDES, BUT IS NOT LIMITED TO, ANY AND ALL WARRANTIES OR MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. DOES NOT WARRANT THE CONTENT TO BE ACCURATE, COMPLETE OR CURRENT. DOES NOT WARRANT THAT THIS WEB SITE WILL OPERATE WITHOUT ERROR, THAT DEFECTS WILL BE CORRECTED OR THAT THIS WEB SITE OR THE WEB SITE SERVER MAKING IT AVAILABLE ARE FREE OF VIRUSES OR OTHER HARMFUL COMPONENTS. PRICE AND AVAILABILITY CONTENT, AS WELL AS OTHER CONTENT CONTAINED IN THIS WEB SITE OR ACCESSIBLE THEREFROM, IS SUBJECT TO CHANGE WITHOUT NOTICE.

YOU ACKNOWLEDGE AND AGREE THAT DOES NOT ENDORSE THE CONTENT OF ANY SITE ACCESSED VIA LINKS OR OTHER MEANS FROM THIS WEB SITE AND IT IS NOT RESPONSIBLE OR LIABLE FOR SUCH CONTENT EVEN THOUGH IT MAY BE UNLAWFUL, HARASSING, LIBELOUS, PRIVACY INVADING, ABUSIVE, THREATENING, HARMFUL, OBSCENE, OR OTHERWISE OBJECTIONABLE, OR THAT IT INFRINGES OR MAY INFRINGE THE INTELLECTUAL PROPERTY OR OTHER RIGHTS OF ANOTHER PERSON.

THIS WEB SITE INCLUDES CONTENT PROVIDED BY THIRD PARTIES AND YOU, OUR CUSTOMER. IS A DISTRIBUTOR OF SUCH CONTENT AND NOT ITS PUBLISHER. EDITORIAL CONTROL OF SUCH CONTENT IS THE SAME AS THAT OF A PUBLIC LIBRARY OR NEWSSTAND. THIRD PARTY SUPPLIERS MAY EXPRESS CERTAIN OPINIONS OR PROVIDE CERTAIN INFORMATION AND OFFERS. MAKES NO WARRANTIES AS TO THE COMPLETENESS, ACCURACY, TIMELINESS, OR RELIABILITY OF INFORMATION OR OFFERS SUPPLIED BY THIRD PARTIES. DOES NOT GUARANTEE OR WARRANT THE PERFORMANCE OF ANY THIRD PARTY, INCLUDING ANY SUCH THIRD PARTY’S CONFORMANCE TO ANY LAW, RULE, REGULATION OR POLICY.

DOES NOT WARRANT THAT INFORMATION, SERVICES, AND PRODUCTS CONTAINED IN THIS WEB SITE WILL SATISFY YOUR REQUIREMENTS OR THAT THEY ARE ERROR OR DEFECT-FREE. BEFORE USING ANY PRODUCT YOU SHOULD CONFIRM ANY INFORMATION OF IMPORTANCE TO YOU ON THE PRODUCT PACKAGING. YOU ASSUME RESPONSIBILITY FOR THE ACCURACY, APPROPRIATENESS AND LEGALITY OF ANY INFORMATION YOU SUPPLY

AS PARTIAL CONSIDERATION FOR YOUR ACCESS TO THIS WEB SITE AND USE OF ITS CONTENT, YOU AGREE THAT IS NOT LIABLE TO YOU IN ANY MANNER WHATSOEVER FOR DECISIONS YOU MAY MAKE OR YOUR ACTIONS OR NON-ACTIONS IN RELIANCE UPON THE CONTENT. YOU ALSO AGREE THAT THE AGGREGATE LIABILITY OF ARISING FROM OR RELATED TO YOUR USE AND ACCESS REGARDLESS OF THE FORM OF ACTION OR CLAIM (FOR EXAMPLE, CONTRACT, WARRANTY, TORT, NEGLIGENCE, STRICT LIABILITY, PROFESSIONAL MALPRACTICE, FRAUD, OR OTHER BASES FOR CLAIMS), IS LIMITED TO THE PURCHASE PRICE OF ANY ITEMS YOU PURCHASED FROM IN THE APPLICABLE TRANSACTION. SHALL NOT IN ANY CASE BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES EVEN IF HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. THIS IS A COMPREHENSIVE LIMITATION OF LIABILITY THAT APPLIES TO ALL LOSES AND DAMAGES OF ANY KIND. IF YOU ARE DISSATISFIED WITH THIS WEB SITE OR ITS CONTENT (INCLUDING TERMS OF USE), YOUR SOLE EXCLUSIVE REMEDY IS TO DISCONTINUE USING THIS WEB SITE. BECAUSE SOME JURISDICTIONS DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES, SUCH LIMITATION MAY NOT BE APPLICABLE TO YOU.

Your Agreement to Abide by All Applicable Laws

By using this Web Site you agree to comply with any and all local, state, or federal laws, statutes, and regulations that relate in any manner to the use of this Web Site and the associated services or products contained thereon.

Relationship between and Users.

and users of our Site are independent contractors, and no agency, partnership, employment or other relationship is created or is intended to be created by the use of our Web Site.

Governing Law and Jurisdiction

This Web Site (excluding linked sites, if any) is administered and controlled by and its affiliates, subsidiaries, officers, directors, employees or agents from its offices in the accordance with the laws of Nevis. You agree that this Terms and Conditions of Use Agreement and this Web Site will be governed by and construed in accordance Nevis law without giving effect to any principles of conflicts of laws. You access this Web Site and/or associated services of at your own risk, and remain responsible for complying with the laws of the jurisdiction within which you are located.

Prices; Payment Terms; Interest

The prices for the products and services on this Web Site are quoted, for convenience, in United States dollars and shall be as set forth in this Web Site as at the time of acceptance of an order by Prices for Products shall be subject to change without any further notice. Credit terms are within sole discretion, and unless otherwise specified in invoice, payment must be received by prior to acceptance of an order.

Consequences

reserves the right to suspend or terminate your account if you violate the Terms of Use Agreement. If your violation causes harm to others, you agree to indemnify and hold harmless from and against any and all loss, damage, or expense. If any dispute arises between us regarding this Agreement or your use of this Web Site, it shall be resolved through good faith negotiations between the parties.

Entire Agreement

These Terms and Conditions and any terms incorporated or referred to herein constitute the entire agreement between and you relating to your use of this Web Site and the subject matter hereof, and supersede any prior understandings or agreements (whether electronic, oral or written) regarding the subject matter, and may not be amended or modified except in writing, or by making such amendments or modifications in accordance with this Terms and Conditions of Use Agreement.

Severability

If any part of this Terms and Conditions of Use Agreement is deemed or determined to be unenforceable, then such part shall be eliminated or limited to the minimum extent necessary. The remainder of this Terms and Conditions of Use Agreement, including any revised portion, shall remain and be in full force and effect. This Terms and Conditions of Use Agreement are the entire agreement between us governing your use of this Web Site.

Headings

The headings contained in this Terms and Conditions of Use Agreement and the Privacy Policy are for reference only.

Force Majeure

shall not be liable for any delay or failure in performance caused by circumstances beyond its reasonable control, including, without limitation, delays due to backorders of requested products, mail delays, customs delays or lost shipments. shall not be responsible to notify the Customer in the event of such delays. The Customer shall be solely responsible to make other arrangements to purchase alternative products and any costs incurred in connection with such purchases.

Thank you again for visiting the Web Site.

Complete Agreement

Except as expressly provided in a particular "legal notice" on this Site, these Terms and Conditions constitute the entire agreement between you and this Site with respect to the use of this Site, and Content. By clicking “I agree” when placing your order, you agree with ALL OF OUR TERMS and CONDITIONS as stated above as well as our Shipping and refunds Policy.

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