CellBio
Vol.05 No.02(2016), Article ID:67077,11 pages
10.4236/cellbio.2016.52002
Adipocyte Derived Mesenchymal Stromal Cell and Platelet Lysate: Ideal Cell and Supplement for the Treatment of Immune-Inflammatory Diseases?
Felipe Rodrigues1,2, Annelise Pezzi1,2,3, Álvaro Laureano1,2, Vanessa Valim1,2,3, Bruna Zambonato1,2,3, Alice Dahmer1,2,3, Letícia Baggio1,2, Filipe Sehn1,2,3, Ianaê Wilke1,2,3, Maria Aparecida L. da Silva1,2, Bruna Amorin1,2*
1Cellular Therapy Center, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
2Laboratory of Cell Culture and Molecular Analysis of Human Cells, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
3Post-graduation in Medicine: Medical Sciences, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
Copyright © 2016 by authors and Scientific Research Publishing Inc.
This work is licensed under the Creative Commons Attribution International License (CC BY).
Received 26 January 2016; accepted 31 May 2016; published 3 June 2016
ABSTRACT
Background: Mesenchymal stromal cells
Keywords:
Mesenchymal Stromal Cells, Dental Pulp, Adipose Tissue, Bone Marrow, T Cells Immunomodulatory Effect
1. Introduction
Mesenchymal stromal cells are a specialized adult stem cell type of mesodermal origin. First identified by Friednstein [1] [2] in fibroblasts colony forming units from the bone marrow
Alternatives to BM MSC have been explored particularly outside the setting of bone marrow transplantation, and usually discarded tissue sources become an attractive option. Lipoaspirate, placenta, umbilical cord blood, umbilical cord, and teeth are amongst discarded tissue studied the most [7] . The role of the MSC source on its regenerative and immunemodulation effects, has been studied and although adipocyte derived MSC appears to have a higher proliferative and immunomodulatory potential, there still have conflicting results concerning the role of MSC source [8] .
Concerns about xenoreactions to fetal calf serum supplemented cultured cells for cellular therapy, led our group [9] and others [10] to explore human derived supplements. As shown in our previous study, in platelet lysate
MSCs from different origins have common nomenclature and characterization as stated by the International Society for Cellular Therapy [11] . The possibility that MSC from different sources can induce distinct immunomodulatory profiles, is not yet entirely clear [12] . Through cell contact and paracrine mechanisms, several types of immune cells are regulated by MSCs. According to the desired effect in its clinical application, the definition of the best MSC source type is important in order to enhance therapeutic benefits. In the present study, we explored the immunomodulatory effect of MSC from dental pulp of human exfoliated deciduous teeth
2. Material and Methods
2.1. Isolation, Expansion and Characterization of Mesenchymal Stromal Cells
Mesenchymal stromal cells were collected after donor agreement and informed consent, according to the local ethical committee. MSC were cultured with DMEM low glucose
2.2. Detection of Cell Viability
Trypan blue viability assay was performed on cells before culture Viability percentage was determined using a Neubauer haemocytometer chamber after staining the cells with 0.4% trypan blue. The accepted mean viability was over 90% (87% - 99%).
2.3. Adipose Derived Mesenchymal Stromal Cells (AD-MSC)
AD-MSC isolation was modified from Zuk et al. [13] . Briefly, 40 - 60 mL lipoaspirate was collected from plastic surgery procedure. Whole material was washed 3 times with PBS using a seringe in a 1:1 volume proportion. Wash lipoaspirated adipose tissue was then incubated with 0.2% type I collagenase solution in a 10:1 volume for 30 minutes in 37˚C, vigorously agitating at each 10 minutes. Cells were centrifuged at 800 g for 10 min, pellet was incubated in NH4CL erythrocyte lysing solution for 10 min, centrifuged at 400 g 10 min, counted and cultured as stated above.
2.4. Bone Marrow Mesenchymal Stromal Cell (BM-MSC)
BM-MSCs were isolated from normal donor bone marrow harvest for transplant or transplant-discarded filters. In brief, filters were washed with 200 mL PBS
2.5. Human Exfoliated Deciduous Teeth Mesenchymal Stromal Cells (SHED-MSC)
Cells were extracted as previously described [15] . Briefly, completely healthy deciduous teeth were extracted and transported in PBS or culture medium. Cells were extracted from dental pulp with dentin curette. Dental pulp was placed in 0.2% type I collagenase and incubated at 37˚C for 1h. Cells were centrifuged at 800 g for 10 min, washed 2× with PBS and cultured in 12 well plates.
2.6. Mesenchymal Osteocyte, Adipocyte and Chondrocyte Differentiation
Osteogenic, adipogenic and chondrogenic differentiation were performed in all cultures. Osteogenic differentiation was induced in Dulbecco’s modified Eagle’s medium low glucose
2.7. PBMC and T Cell Isolation
Venous blood was collected from healthy donors. Mononuclear cells were isolated by gradient centrifugation in histopaque
2.8. Comparison of Proliferative Potential of MSC
MSC from all sources were expanded until passage five for comparison of proliferative potential. Population doubling point formula was used to estimate the cell proliferation based on the time in culture, number of plated cells and the number of cells at moment of trypsinization at the chosen passage. A = n˚ trypsinized cells; B = n˚ plated cells; C = n˚ hours in culture.
2.9. Co Culture Experiments
Protocol was adapted from Le Blanc et al. [16] . In brief, after 3 days of lymphocytes expansion, they were incubated with 5 mM CFSE
2.10. Flow Cytometry
Lymphocytes and MSC viable cells were counted and adjust for a concentration of 2 × 106 cell/mL in PBS, the cells were distribute in flow cytometry tubes
2.11. Statistical Analysis
For proliferation analyses were used one-way Anova and Tukey’s Post Hoc; Paired T test was used when applicable.
3. Results
3.1. Samples Description
There were a total of 10 samples analyzed, three from BM and SHED, and four from adipose tissue. Table 1 describes the general characteristics of the samples.
3.2. Mesenchymal Stromal Cell Imunophenotype from Three Distinct Sources
Mesenchymal cells were analyzed by flow cytometry as stated in Methods, and MSC from all were characterized in accordance to the ISCT [11] .
Table 1. MSC general characteristics.
F: Female; M: male; BM: bone marrow; AD: adipose tissue; SHED: dental pulp from human exfoliated deciduous teeth.
3.4. Mesenchymal Adipocyte, Chondrocyte and Osteocyte Differentiation
All sources of MSC were able to multilineage differentiation in adipocytes, chondrocytes and osteocytes, as shown in Figure 1.
3.5. Proliferation of BM-, SHED-, and AP-MSC
Adipose derived MSC had a significantly (p = 0.0017) better proliferation ratio, then the other sources in all passages. BM and SHED had no difference among them, as stated in Figure 2.
3.6. MSCs Are Capable to Inhibit Lymphocyte Proliferation
To answer if all three sources had the same immunomodulation potential, it was analyzed the capability of MSC to inhibit lymphocyte proliferation through CFSE by flow cytometry. All sources inhibited lymphocyte proliferation both in T and PBMC group, as showed in Figure 3.
3.7. Immunophenotyping of T and PBMC Lymphocytes co Cultured with MSC
To address if MSC could have different influence in lymphocytes subsets as a mechanism of action for their immunomodulation ability, the effect of MSC from each source on PBMC or isolated T cells subsets CD4, CD8, Treg, NK lymphocytes, and B cells were analyzed. MSC of all sources, except Adipocyte tissue, were able to tend to diminish all lymphocytes subsets in co-cultures experiments either with PBMC or T cells. Shed-MSCs were more efficient in significantly inhibiting PBMC derived Treg and TCD4+ cells (p = 0.01 and p = 0.02 respectively) then MSCs of any other source. On the other hand, AD-MSC had more profound and differential effects either when co-cultured with PBMC or isolated T cells. AD-MSC were able to statistically decreased (p = 0.04) the number of B lymphocytes from PBMC, and when co-cultured with isolated T cells it significantly decreased CD8+ (p = 0.008) and increased Treg (p = 0.01) lymphocytes (Figure 4).
Figure 1. Multilineage differentiationl of BM-, SHED- and AP-MSC.
Figure 2. Proliferation comparison of bone marrow, human exfoliated deciduous teeth and adipose tissue MSC.
(a) (b) (c)(d) (e) (f)(g) (h)
Figure 3. Effect of adipocyte derived MSC
(a) (b)(c) (d)(e) (f)
Figure 4. Effect of adipocyte derived MSC
3.8. LP Has Different Lymphocyte Subset Stimulation
To address if LP can increase any type of lymphocyte subset, we compared PBMC and T cells proliferation and immune phenotype cultured with SBF or LP. Either from PBMC or isolated T cells, PL alone significantly (p = 0.01 and p = 0.02, respectively) increased Treg expression. Furthermore, differently from MSC, LP does not change proliferation prolife among the groups (Figure 5).
(a) (b)(c)
Figure 5. Comparison of platelet lysate
4. Discussion
Mesenchymal stromal cells are been tested in clinical trials for the treatment of several immune related diseases [17] , as well as, in regenerative medicine [18] . MSC, along with other mesodermal derived cells, are present in several organs and tissues stroma and its regenerative and imunomodulation potential might variate with the different millieu it is obtained of. Here we show the results of co-culturing MSC from three different sources: adipocyte, bone marrow and SHED with unsepareted PBMC and CD3+ isolated T cells. Additionally, different human derived supplements for cell cultures are been tested in order to avoid unwanted xenoreactions already described when fetal calf serum is utilized as supplement [19] .
As showed by others [20] , in our hands, AD-MSC exhibited a significant superior proliferative (Figure 2) and immunomodulation effect (Figure 3). BM and SHED derived MSC tent to decrease T cells subsets
AD-MSCs not only exhibited a higher proliferative capacity but also were able to significantly (p = 0.04) decrease B cells from PBMC.. When co-cultured with purify T cells AD-MSC significantly decrease CD8+ (p = 0.008) cells and increase Tregs (p = 0.01). Additionaly, to test a possible influence of the type of supplement utilized in MSC cultures, we showed that platelet lisate also have an independent immunomodulation effect: it significantly increases Tregs when utilized as a supplement for PBMC or T lymphocytes p = 0.01 and p = 0.02, respectively (Figure 5). However, the observed increase in Tregs in co-cultures with T lymphocytes cannot be attributed to the use of PL alone, since all cultures, from all sources were tested in the presence of PL and only the AD-MSC/Tcell co-culture effectivelly increased Tregs.
T regulatory cells are known to modulate graft versus host disease (GVHD) [21] and autoimmunity [22] . AD-MSC might turn out to be the ideal type of MSC to be tested in cellular therapy trials for theses diseases. In this study, co culture of AD-MSC and magneticaly purified T cells, significantly increased Treg cells. In accordance with literature [10] this effects could be a mechanism for immunesuppresion.
As stated above, SHED when cultured with PBMC were significantly effective in decresing T CD4+ cells and Tregs, an effect that could be attributed to the fact that in cases of agression and lymphocyte infiltration, pulp MSC allows T CD8+ infiltration and expansion in a dose dependent manner in the presence of bacterial or fungal infections, decreasing CD4+ numbers [23] [24] . SHED-MSC could be utilized in such clinical settings.
In accordance with Lee et al. [25] , we demosntrated that LP alone can increase Treg phenothype. A study on the effects of MSC of different sources cultured either with FCS or PL is underway to see if the observed PL related Tregs increase can affect MSC from different tissues. Finally, TGF-β known to be present in PL can strongly induce Treg phenotype and MSC homing in GVHD [26] [27] . PL effect on Tregs might be attributed to this growth factor [28] [29] .
5. Conclusion
Adipocyte derived MSC, among other tissue derived MSC, can proliferate better and among other MSC sources is more efficient in inducing immunoregulatory cells. BM derived MSC is an approved cellular therapy for steroid resistant GVHD, and is being tested for a variaty of inflamatory diseases. BM derived cells are suited for cellular therapy because they are obtained from a healthy hematopoietic stem cell transplant donor tested for all known microbial infections. Lipoaspirate, on the other hand, is usually obtained from plastic surgery, where possible infective pathogens are not taken into consideration. Autologous lipoaspirate in the setting of an inflamatory disease is a rather invasive procedure. In spite of that, adipocyte derived MSC cultured with PL, might be the best type of MSC for the treatment of inflamatory or autoimmune disease.
Acknowledgements
The study received financial support from Hopital de Clinicas de Porto Alegre investment Research fund
Conflict of Interrest
The authors declare no conflict of interests.
Cite this paper
Felipe Rodrigues,Annelise Pezzi,Álvaro Laureano,Vanessa Valim,Bruna Zambonato,Alice Dahmer,Letícia Baggio,Filipe Sehn,Ianaê Wilke,Maria Aparecida L. da Silva,Bruna Amorin, (2016) Adipocyte Derived Mesenchymal Stromal Cell and Platelet Lysate: Ideal Cell and Supplement for the Treatment of Immune-Inflammatory Diseases?. CellBio,05,15-25. doi: 10.4236/cellbio.2016.52002
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NOTES
*Corresponding author.