Stem Cell Technology Research Center

Tehrān, Iran

Stem Cell Technology Research Center

Tehrān, Iran
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Shabani I.,Amirkabir University of Technology | Haddadi-Asl V.,Amirkabir University of Technology | Seyedjafari E.,University of Tehran | Seyedjafari E.,Stem Cell Technology Research Center | Soleimani M.,Tarbiat Modares University
Biochemical and Biophysical Research Communications | Year: 2012

Electrospinning is currently used to fabricate nanofibrous scaffolds for tissue engineering applications. The major problem of these scaffolds is their intrinsically two-dimensional nature which inhibits cellular migration and in-growth. In this study, we have introduced a modified setup of electrospinning to produce three-dimensional nanofibrous scaffolds which allows improved infiltration of cells. An array of focused halogen light bulbs was used to localize the heat in the path of electrospun jet near the collector. The fabricated mats were then seeded with cells in order to evaluate migration and infiltration. After 14. days of culture, a homogenous distribution of cells was observed throughout the scaffolds and showed the three-dimensional architecture of nanofibrous mats. By this novel and simple setup, the prepared electrospun mats will allow the seeded cells to obtain a three-dimensional arrangement which is ideal for tissue engineering applications. © 2012 .

Hasani-Sadrabadi M.M.,Amirkabir University of Technology | Hasani-Sadrabadi M.M.,Ecole Polytechnique Federale de Lausanne | Shabani I.,Amirkabir University of Technology | Shabani I.,Stem Cell Technology Research Center | And 2 more authors.
Journal of Power Sources | Year: 2011

New types of triple-layer membranes were fabricated using multi-step impregnation of Nafion in electrospun webs based on bead-free nanofibers of sulfonated poly(ether sulfone) (SPES). The results showed that the fabricated nanofiber-filled membrane owing to its reduced methanol permeability as well as sufficient proton conductivity and membrane selectivity can be used as a promising proton exchange membrane for direct methanol fuel cell (DMFC) applications. The single cell DMFC performance results revealed that the SPES nanofiber-based triple-layer membranes have higher electrochemical performance than commercial Nafion membranes. © 2011 Elsevier B.V. All rights reserved.

Soleimani M.,Tarbiat Modares University | Nadri S.,Stem Cell Technology Research Center | Nadri S.,Shahid Beheshti University | Shabani I.,Amirkabir University of Technology
International Journal of Developmental Biology | Year: 2010

The selection of a good quality scaffold is an essential strategy for tissue engineering. Ideally, the scaffold should be a functional and structural biomimetic of the native extracellular matrix and support multiple tissue morphogenesis. However, investigators have previously shown that three-dimensional nanofibrous scaffolds are capable of influencing cellular behavior. In this study, we experimented with a three-dimensional nanofibrous scaffold fabricated from aligned-poly L-lactic acid (PLLA) for its ability to support neurogenic and hinder dopaminergic differentiation of conjunctiva mesenchymal stem cells (CJMSCs) in vitro. In this work, CJMSCs were seeded onto nanofibrous scaffolds, and were induced to differentiate along neurogenic lineages by culturing in specific differentiation media. Scanning electron microscopy imaging, RTPCR and immunocytochemistry were used to analyze cultivated CJMSCs on scaffold and their expression of neurogenic-specific markers. We found a lack of expression of dopaminergic genes in CJMSCs seeded on align PLLA scaffold, while neurocyte-cell markers including Nestin, NSE, MAP-2 and β-Tubulin III were expressed in these cells. On the basis of these experimental results, we conclude that the nanofibrous PLLA scaffold reported herein could be used as a potential cell carrier in neural tissue engineering and that these scaffolds could be useful for the partial inhibition of the dopaminergic differentiation of CJMSCs. © 2010 UBC Press.

Seyedjafari E.,University of Tehran | Seyedjafari E.,Stem Cell Technology Research Center | Soleimani M.,Tarbiat Modares University | Ghaemi N.,University of Tehran | And 2 more authors.
Biomacromolecules | Year: 2010

A combination of calcium phosphates with nanofibrous scaffolds holds promising potential for bone tissue engineering applications. In this study, nanohydroxyapatite (n-HA) was coated on the plasma-treated surface of electrospun poly(L-lactide) (PLLA) nanofibers and the capacity of fabricated scaffolds for bone formation was investigated in vitro using human cord blood derived unrestricted somatic stem cells (USSC) under osteogenic induction and in vivo after subcutaneous implantation. PLLA and n-HA-coated PLLA (n-HA/PLLA) scaffolds exhibited a nanofibrous structure with interconnected pores and suitable mechanical properties. These scaffolds were also shown to support attachment, spreading, and proliferation of USSC, as shown by their flattened normal morphology and MTT assay. During osteogenic differentiation, significantly higher values of ALP activity, biomineralization, and bone-related gene expression were observed on n-HA/PLLA compared to PLLA scaffolds. Subsequently, these markers were measured in higher amounts in USSC on PLLA nanofibers compared to TCPS. According to the in vivo results, ossification and formation of trabeculi was observed in the n-HA/PLLA scaffold compared to PLLA. Taking together, it was shown that nanofibrous structure enhanced osteogenic differentiation of USSC. Furthermore, surface-coated n-HA stimulated the effect of nanofibers on the orientation of USSC toward osteolineage. In addition, the n-HA/PLLA electrospun scaffold showed the capacity for ectopic bone formation in the absence of exogenous cells. © 2010 American Chemical Society.

Seyedjafari E.,University of Tehran | Seyedjafari E.,Stem Cell Technology Research Center | Ghaemi N.,University of Tehran | Sarbolouki M.N.,University of Tehran
Journal of Materials Science: Materials in Medicine | Year: 2011

A new stem cell-scaffold construct based on poly-l-lactide (PLLA) nanofibers grafted with collagen (PLLA-COL) and cord blood-derived unrestricted somatic stem cells (USSC) were proposed to hold promising characteristics for bone tissue engineering. Fabricated nanofibers were characterized using SEM, ATR-FTIR, tensile and contact angle measurements. The capacity of PLLA, plasma-treated PLLA (PLLA-pl) and PLLA-COL scaffolds to support proliferation and osteogenic differentiation of USSC was evaluated using MTT assay and common osteogenic markers such as alkaline phosphatase (ALP) activity, calcium mineral deposition and bone-related genes. All three scaffolds showed nanofibrous and porous structure with suitable physical characteristics. Higher proliferation and viability of USSC was observed on PLLA-COL nanofibers compared to control surfaces. In osteogenic medium, ALP activity and calcium deposition exhibited the highest values on PLLA-COL scaffolds on days 7 and 14. These markers were also greater on PLLA and PLLA-pl compared to TCPS. Higher levels of collagen I, osteonectin and bone morphogenetic protein-2 were detected on PLLA-COL compared to PLLA and PLLA-pl. Runx2 and osteocalcin were also expressed continuously on all scaffolds during induction. These observations suggested the enhanced proliferation and osteogenic differentiation of USSC on PLLA-COL nanofiber scaffolds and introduced a new combination of stem cell-scaffold constructs with desired characteristics for application in bone tissue engineering. © 2010 Springer Science+Business Media, LLC.

Norouzi M.,Stem Cell Technology Research Center | Boroujeni S.M.,Sharif University of Technology | Omidvarkordshouli N.,Tarbiat Modares University | Soleimani M.,Tarbiat Modares University
Advanced Healthcare Materials | Year: 2015

The paucity of cellular and molecular signals essential for normal wound healing makes severe dermatological ulcers stubborn to heal. The novel strategies of skin regenerative treatments are focused on the development of biologically responsive scaffolds accompanied by cells and multiple biomolecules resembling structural and biochemical cues of the natural extracellular matrix (ECM). Electrospun nanofibrous scaffolds provide similar architecture to the ECM leading to enhancement of cell adhesion, proliferation, migration and neo tissue formation. This Review surveys the application of biocompatible natural, synthetic and composite polymers to fabricate electrospun scaffolds as skin substitutes and wound dressings. Furthermore, the application of biomolecules and therapeutic agents in the nanofibrous scaffolds viz growth factors, genes, antibiotics, silver nanoparticles, and natural medicines with the aim of ameliorating cellular behavior, wound healing, and skin regeneration are discussed. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Jafary H.,University of Tehran | Ahmadian S.,University of Tehran | Soleimani M.,Tarbiat Modares University | Soleimani M.,Stem Cell Technology Research Center
Tumor Biology | Year: 2014

Acetylation of histone is a major player in epigenetic modifications, resulting in open chromatin structures and, hence, permissive conditions for transcription-factor recruitment to the promoters, followed by initiation of transcription. Histone deacetylase inhibitors arrest cancer cell growth and cause apoptosis with low toxicity thereby constituting a promising treatment for cancer. In this study, we examined the antiproliferative effects of valproate with a combination of nicotinamide in the MCF-7 cell line. MCF-7 was treated with various concentrations of valproate. The MTT assay showed that the viability of MCF-7 cells was inhibited and the cell activity was decreased. Viability percent of valproate and nicotinamide combined treatment cells (28 ± 2) was 1.78 times increased compared with the valproate-alone (0.5 mM) treated cells (50 ± 2). Colony formation in soft agar indicated that valproate at 0.3 mM, when used alone, weakly suppressed proliferation of cells (82 ± 3) and the combination treatment of valproate + nicotinamide strongly suppressed cell proliferation (51 ± 3). The flow cytometric and microscopic analyses of HDACI combined with treated cells indicated strong apoptosis induction and nuclear morphological alterations greater than those of valproate alone. Real-time reverse transcriptase-polymerase chain reaction (RT-PCR) analysis confirmed the efficiency of the HDAC inhibitor combination, revealing the effectively upregulated p16 and p21. Furthermore, to investigate the role of acetyl-histone H3 levels, western blot analyses have been performed and high levels of acetylated histone H3 were detected in valproate- and nicotinamide-treated cells. These results suggest that the combination treatment of valproate with nicotinamide exerts significant antitumor activity and could be a promising therapeutic candidate to treat human breast cancer. © 2013 International Society of Oncology and BioMarkers (ISOBM).

Ardeshirylajimi A.,Stem Cell Technology Research Center | Dinarvand P.,Stem Cell Technology Research Center | Seyedjafari E.,University of Tehran | Langroudi L.,Stem Cell Technology Research Center | And 2 more authors.
Cell and Tissue Research | Year: 2013

Tissue engineering with a combination of stem cells and nanofibrous scaffolds has attracted interest with regard to bone regeneration applications. In the present study, human induced pluripotent stem cells (iPSCs) were cultured on polymeric nanofibrous polyethersulfone (PES) with and without plasma treatment. The capacity of PES and plasma-treated PES (Plasma-PES) scaffolds to support the proliferation and osteogenic differentiation of iPSCs was investigated by MTT assay and for common osteogenic markers such as alkaline phosphatase activity, calcium mineral deposition and bone-related genes. Plasma-PES scaffolds with or without iPSCs were subsequently used to evaluate bone regeneration of critical-size defects in the rat by digital mammography, multislice spiral-computed tomography imaging and histological analysis. The results of in vitro analysis showed that plasma treatment significantly enhanced iPSC proliferation and osteogenesis. After 8 weeks of iPSC-loaded Plasma-PES implantation, no mortality or complication was observed in animals or at the site of surgery. Imaging analysis revealed more extensive bone reconstruction in rats receiving nanofibers compared with untreated control groups. Moreover, Plasma-PES seeded with iPSCs induced the highest regeneration of bone defects among all groups. These findings were confirmed by histological staining. Affective osseointegration was observed in implanted scaffolds. Thus, plasma-treated nanofibrous scaffolds are suitable tissue-engineered matrices for supporting the proliferation and osteogenic differentiation of iPSCs and might also be appropriate for the reconstruction of bone defects. © 2013 Springer-Verlag Berlin Heidelberg.

Yousefi F.,Tarbiat Modares University | Ebtekar M.,Tarbiat Modares University | Soleimani M.,Tarbiat Modares University | Soudi S.,Stem Cell Technology Research Center | Hashemi S.M.,Stem Cell Technology Research Center
International Immunopharmacology | Year: 2013

Due to their immunomodulatory and anti-inflammatory competence, mesenchymal stem cells (MSCs) have been considered as a suitable candidate for treatment of autoimmune diseases. Earlier studies have shown that treatment with bone marrow-derived MSCs may modulate immune responses and reduce disease severity in experimental autoimmune encephalomyelitis (EAE), an animal model of multiple sclerosis. Here we compare the immune regulatory properties of adipose tissue MSCs (AT-MSCs) in two independent routes of injection; namely intraperitoneal (IP) and intravenous (IV). We investigated the splenic CD4 + CD25 + FOXP3 + T cell population known as regulatory T cells, by flow cytometry and their brain cell infiltration by hematoxylin-eosin staining in both IP and IV routes of AT-MSC administration. We also evaluated the inflammatory cytokine profile including IFN-γ and IL-17 and anti-inflammatory cytokines such as IL-4 by ELISA technique in both routes of cell administration. We show that the IP route has a more pronounced effect in maintaining the splenic CD4 + CD25 + FOXP3 + T cell population and increase of IL-4 secretion. We also showed that IP injection of cells resulted in lower IFN-γ secretion and reduced cell infiltration in brain more effectively as compared to the IV route. The effects of AT-MSCs on down-regulation of splenocyte proliferation, IL-17 secretion and alleviating the severity of clinical scores were similar in IP and IV routes. Our data show that, due to their immunomodulative and neuroprotective effects, AT-MSCs may be a proper candidate for stem cell based MS therapy. © 2013 Elsevier B.V.

Hashemi S.M.,Tarbiat Modares University | Hassan Z.M.,Tarbiat Modares University | Pourfathollah A.A.,Tarbiat Modares University | Soudi S.,Tarbiat Modares University | And 2 more authors.
Journal of Cellular Biochemistry | Year: 2013

Adipose tissue-derived mesenchymal stem cells (AD-MSCs) have been shown to be capable of differentiating into multiple cell type and exert immunomodulatory effects. Since the selection of ideal stem cell is apparently crucial for the outcome of experimental stem cell therapies, therefore, in this study we compared AD-MSCs conditioned media (CM) from BALB/c, C57BL/6, and DBA mouse strains. No significant difference was found in the morphology, cell surface markers, in vitro differentiation and proliferation potentials of AD-MSCs isolated from C57BL/6, BALB/c, and DBA mice. The immunological assays showed some variation among the strains in the cytokines, nitric oxide (NO), and indoleamine 2,3-dioxygenase (IDO) production and immunomodulatory effects on splenocytes functions. Our results indicated a suppression of splenocytes proliferation in the presence of AD-MSC CM from the three inbred mouse strains. However, BALB/c CM exerted a higher suppression of splenocytes proliferation. AD-MSCs isolated from C57BL/6 and BALB/c mice produced higher levels of TGF-β than those from DBA mice. Furthermore, IL-17 and IDO production was higher in AD-MSCs isolated from BALB/c mice. Our results indicated an increased production of TGF-β, IL-4, IL-10, NO, and IDO by splenocytes in response to CM from BALB/c AD-MSCs. In conclusion, our results showed that the immunomodulatory properties of mouse AD-MSCs is strain-dependent and this variation should be considered during selection of appropriate stem cell source for in vivo experiments and stem cell therapy strategies. J. Cell. Biochem. 114: 955-965, 2013. © 2012 Wiley Periodicals, Inc. Copyright © 2012 Wiley Periodicals, Inc.

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