Are there enough stem cells in your knees to heal the …
By daniellenierenberg
Are there enough stem cells in your knees to heal the damage of osteoarthritis? If yes, why arent those stem cells fixing your knees now? Is it a lack of numbers?
Marc Darrow MD, JD. Thank you for reading my article. You can ask me your questions about bone marrow derived stem cells using the contact form below.
In 2011, doctors at the University of Aberdeen published research in the journal Arthritis and rheumatism that provided the first evidence that resident stem cells in the knee joint synovium underwent proliferation (multiplied) and chondrogenic differentiation (made themselves into cartilage cells) following injury.(1)
If the stem cells in your knee synovial lining are abundant and have the ability to rebuild cartilage after injury, why isnt your knee fixing itself?
One of those 40 studies was performed by researchers at theUniversity of Calgary in 2012. Among their questions, if the stem cells in the knee synovial lining are abundant and have the ability to rebuild cartilage after injury, why isnt the knee fixing itself? Here is what they published:
Since osteoarthritis leads to a progressive loss of cartilage and synovial progenitors (rebuilding) cells have the potential to contribute to articular cartilage repair, the inability of osteoarthritis synovial fluid Mesenchymal progenitor cells (stem cell growth factors) to spontaneously differentiate into chondrocytes suggests that cell-to-cell aggregation and/or communication may be impaired in osteoarthritis and somehow dampen the normal mechanism of chondrocyte replenishment from the synovium or synovial fluid. Should the cells of the synovium or synovial fluid be a reservoir of stem cells for normal articular cartilage maintenance and repair, these endogenous sources of chondro-biased cells would be a fundamental and new strategy for treating osteoarthritis and cartilage injury if this loss of aggregation & differentiation phenotype can be overcome.(2)
This research was supported in anew study from December 2017 In Nature reviews. The paper suggested that recognizing that joint-resident stem cells are comparatively abundant in the joint and occupy multiple niches (from the center of the joint to the out edges) will enable the optimization of single-stage therapeutic interventions for osteoarthritis.(3) The idea is to get these native stem cells to repair.
Now we know that there are many stem cells in the knee, when there is an injury there are more stem cells. If we can figure out how to get these stem cells turned on to the healing mode, the knee could heal itself of early stage osteoarthritis. So the problem is not the number of stem cells, BUT, communication.
This failure to communicate was also seen in other research. In 2016, another heavily cited paper, this time fromTehran University for Medical Sciences, noted that despite their larger numbers,the native stem cells act chaotically and are unable to regroup themselves into a healing mechanism and repair the bone, cartilage and other tissue. Introducing bone marrow stem cells into this environmentgets the native stem cells in line and redirects them to perform healing functions. The joint environmentis changed from chaotic to healing because of communication.(4) It should be pointed out that at the time of this article update (August 2018) 62 medical studies cited the research in this papers findings).
A recentpaper from a research team inAustralia confirms how this change of joint environment works. It starts with cell signalling a new communication network is built.
University of Iowa research published in theJournal of orthopaedic research
Serious meniscus injuries seldom heal and increase the risk for knee osteoarthritis; thus, there is a need to develop new reparative therapies. In that regard, stimulating tissue regeneration by autologous (from you, not donated) stem/progenitor cells has emerged as a promising new strategy.
(The research team) showed previously that migratory chondrogenic progenitor cells (mobile cartilage growth factors) were recruited to injured cartilage, where they showed a capability in situ (on the spot) tissue repair. Here, we tested the hypothesis that the meniscus contains a similar population of regenerative cells.
Explant studies revealed that migrating cells were mainly confined to the red zone (where the blood is and its growth factors) in normal menisci: However, these cells were capable of repopulating defects made in the white zone (the desert area where no blood flows. Migrating cell numbers increased dramatically in damaged meniscus. Relative to non-migrating meniscus cells, migrating cells were more clonogenic, overexpressed progenitor cell markers, and included a larger side population. (They were ready to heal) Gene expression profiling showed that the migrating population was more similar tochondrogenic progenitor cells (mobile cartilage growth factors) than other meniscus cells. Finally, migrating cells equaledchondrogenic progenitor cells in chondrogenic potential, indicating a capacity for repair of the cartilaginous white zone of the meniscus. These findings demonstrate that, much as in articular cartilage, injuries to the meniscus mobilize an intrinsic progenitor cell population with strong reparative potential.(6)
The intrinsic progenitor cell population with strong reparative potential are in your knee waiting to be mobilized.
So what are we to make of this research?There are a lot of stem cells in a knee waiting to repair. The problem is they are confused and not getting the correct instructions. Bone marrow stem cell therapy can fix the communication problem and begin the repair process anew.
A leading provider of bone marrow derived stem cell therapy, Platelet Rich Plasma and Prolotherapy11645 WILSHIRE BOULEVARD SUITE 120, LOS ANGELES, CA 90025
PHONE: (800) 300-9300
1 Kurth TB, Dellaccio F, Crouch V, Augello A, Sharpe PT, De Bari C. Functional mesenchymal stem cell niches in adult mouse knee joint synovium in vivo. Arthritis Rheum. 2011 May;63(5):1289-300. doi: 10.1002/art.30234.
2 Krawetz RJ, Wu YE, Martin L, Rattner JB, Matyas JR, Hart DA. Synovial Fluid Progenitors Expressing CD90+ from Normal but Not Osteoarthritic Joints Undergo Chondrogenic Differentiation without Micro-Mass Culture. Kerkis I, ed.PLoS ONE. 2012;7(8):e43616. doi:10.1371/journal.pone.0043616.
3 McGonagle D, Baboolal TG, Jones E. Native joint-resident mesenchymal stem cells for cartilage repair in osteoarthritis. Nature Reviews Rheumatology. 2017 Dec;13(12):719.
4Davatchi F, et al. Mesenchymal stem cell therapy for knee osteoarthritis: 5 years follow-up of three patients. Int J Rheum Dis. 2016 Mar;19(3):219-25.
5. Freitag J, Bates D, Boyd R, Shah K, Barnard A, Huguenin L, Tenen A.Mesenchymal stem cell therapy in the treatment of osteoarthritis: reparative pathways, safety and efficacy a review.BMC Musculoskelet Disord. 2016 May 26;17(1):230. doi: 10.1186/s12891-016-1085-9. Review.
6 Seol D, Zhou C, et al. Characteristics of meniscus progenitor cells migrated from injured meniscus. J Orthop Res. 2016 Nov 3. doi: 10.1002/jor.23472.
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