در هنگام جستجو کلمه در قسمت عنوان میتوانید کلمات مورد جستجو را با کاراکتر (-) جدا کنید.
کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: VETERINARY RESEARCH FORUM
- نوع مقاله: Journal Article
- کلمات کلیدی: Rabbit,Stem Cell,bone healing,fibrin membrane,platelet growth factor
- چکیده:
- چکیده انگلیسی: The present study was designed to evaluate the effects of platelet growth factors and periosteal mesenchymal stem cells on bone healing process, radiographically. Forty male White New Zealand rabbits in five equal groups were used in this study. A 2 mm full thickness bone defect was made in left radial bone of each animal. In group A (control) the defect was left with no medical intervention. In group B the defect was covered by a fibrin membrane. In group C the defect was covered by a fibrin membrane plus platelet growth factors. In group D the defect was covered by a fibrin membrane plus periosteal mesenchymalstem cells, and in group E the defect was covered by a fibrin membrane enriched with platelet growth factors and periosteal mesenchymalstem cells. Radiological evaluation was done immediately after surgery (week 0) and then at the 1st, 2nd, 4th, 6th and 8th weeks after operation. At the end of the eighth week, bone samples were taken to evaluate the histopathology. The radiological and histopathological observations showed a superior bone healing in the groups D and E, after eight weeks in comparison with the groups A, B and C. According to this study, it could be concluded that the platelet growth factors and periosteal mesenchymalstem cells could promote bone regeneration in long bone defects in a rabbit model.
- انتشار مقاله: 03-03-1397
- نویسندگان: Amin Paidar Ardakani,Mohammd Mehdi Oloumi,Alireza Farsinejad,Reza Kheirandish
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Kerman University of Medical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: Insulin,diabetes,Adipose tissue,Mesenchymal stem cells (MSCs)
- چکیده:
- چکیده انگلیسی: Background & Aims: Type 1 diabetes, or insulin-dependent diabetes, is an autoimmune disease in which pancreatic beta cells are destroyed by the immune system. Hitherto, no definite treatment has been found for this condition. Mesenchymal stem cells (MSCs) are multipotent, self-renewing cells that have the ability to differentiate into mesodermal tissues. This ability has attracted the attention of researchers toward MSCs as therapeutic agents. The aim of this study was to inspect the in vitro differentiation of human adipose-derived tissue stem cells (hADSCs) into insulin producing cells (IPCs) using minimal differentiation factors to provide a source of cells for the purpose of diabetic cell therapy. Methods: The hADSCs were obtained from liposuction aspirates and induced to differentiate into IPCs under a two-stage protocol. In the pre-induction stage, a combination of low-glucose DMEM medium, 20% (FBS), β-mercaptoethanol, and nicotinamide, and in the induction stage, high-glucose DMEM, β- mercaptoethanol, and nicotinamide without FBS was used. Differentiation was evaluated through morphological analysis, dithizone (DTZ) staining, and reverse transcription polymerase chain reaction (RTPCR). In order to evaluate the performance of differentiated cells, insulin production level was measured. Results: Morphological changes were observed using an inverted microscope at the end of the differentiation stage. Based on dithizone staining, differentiated cells were positive. Furthermore, RT-PCR confirmed the expression of insulin, pancreatic duodenal homeobox (PDX-1), paired box gene 4 (PAX-4), and glucose transporter type 2 (GLUT2) in differentiated cells. Moreover, insulin production by the IPCs was confirmed using enzyme-linked immunosorbent assay (ELISA). Conclusion: It can be concluded that hADSCs can differentiate into IPCs using minimal differentiation factors.
- انتشار مقاله: 23-04-1395
- نویسندگان: Iman Rad,Alireza Farsinejad,Mohammad-Amin Edalatmanesh
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Pathology
- نوع مقاله: Journal Article
- کلمات کلیدی: Rabbit,Stem Cell,Growth factors,bone healing,Allogeneic bone graft
- چکیده:
- چکیده انگلیسی: Background & Objective:This study aimed to investigate the effect of decellularized allogeneic bone graft enriched by periosteal stem cells (PSCs) and growth factors on the bone repair process in a rabbit model, which could be used in many orthopedic procedures.
Methods: In this experimental study, a critical size defect (CSD) (10 mm) was created in the radial diaphysis of 40 rabbits. In group A, the defect was left intact with no medical intervention. In group B, the defect was filled by a decellularized bone graft. In group C, the defect was implanted by a decellularized bone graft enriched with platelet growth factors. In group D, the defect was treated by a decellularized bone graft seeded by periosteal mesenchymal stem cells (MSCs). Also, in group E, the defect was filled by a decellularized bone graft enriched with platelet growth factors and periosteal MSCs. Radiological evaluation was done on the first day and then in the second, fourth, and eighth weeks after the operation. The specimens were harvested on the 28th and 56th postoperative days and evaluated for histopathological criteria.
Results: The radiologic and microscopic analysis of the healing process in bone defects of the treated groups (C, D, and E) revealed more advanced repair criteria than those of groups A and B significantly (P<0.05).
Conclusion: Based on this study, it appears that implantation of concentrated PSCs in combination with growth factors and allogeneic cortical bone graft is an effective therapy for the repair of large bone defects.- انتشار مقاله: 29-10-1397
- نویسندگان: Hadi Hassibi,Alireza Farsinejad,Shahriar Dabiri,Dariush Vosough,Abbas Mortezaeizadeh,Reza Kheirandish,Omid Azari
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Pathology
- نوع مقاله: Journal Article
- کلمات کلیدی: WOUND HEALING,immune system,Fibroblast,Allogeneic
- چکیده:
- چکیده انگلیسی: Background and Objective: In recent years, due to increasing number of patients with non-healing skin ulcers, skin substitutes have been used. Skin substitutes contain living cells causing faster and more effective wound healing. Therefore, research on the use of autologous and allogeneic cells such as fibroblasts in skin substitutes has attracted attentions. However, there are discrepancies in the immune responses to allogeneic fibroblasts. Therefore, we aimed to review the immune responses to allogeneic fibroblasts.
Methods: Donor fibroblasts were isolated from the skin of three rats. Nine recipient rats which were subcutaneously injected with three different regimens, were divided into three groups: Group 1; phosphate buffered saline (PBS) without cells (control), group 2: allogeneic fibroblasts of one animal source suspended in phosphate buffered saline, and group 3; phosphate buffered saline containing mixed allogeneic fibroblasts of three animal sources. The skin samples were biopsied at 1, 3 and 7 days after injection and studied histopathologically.
Results and Conclusion: No signs of redness and edema were observed in the injection sites. In pathology examination, changes such as vasculitis, eosinophils and lymphocytes accumulation around fibroblasts, fibroblast apoptosis and transplant rejection at the injection site were not observed in either group.
Subcutaneous injection of allogeneic fibroblasts in rats can be introduced as a promising approach for wound healing as they do not stimulate the immune system.- انتشار مقاله: 07-03-1396
- نویسندگان: Seyedeh Mehrnaz Kouhbanani Nejad,Farzaneh Armin,Shahriar Dabiri,Ali Derakhshani,Maryam Iranpour,Alireza Farsinejad
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Pathology
- نوع مقاله: Journal Article
- کلمات کلیدی: Mesenchymal Stem Cells,Differentiation,Regenerative medicine,Peripheral blood
- چکیده:
- چکیده انگلیسی: Background and Objectives: The mesenchymal stem cells derived from peripheral blood (PB) have been recognized as a promising source for allogeneic cell therapy. The aim of this study was to investigate the isolation, growth and differentiation ability of peripheral blood-isolated mesenchymal stem cells.
Methods: The mononuclear cells were purified from fresh peripheral blood using density gradient centrifugation then cultured in a suitable medium, expanded and characterized. In the following, these cells were cultured in specific adipogenic and osteogenic differentiation media.
Results and Conclusion: In spite of the absence of any stimulating factor, the cells adhered to the flasks and developed a rather homogeneous, spindle-shaped morphology after consecutive passages. The cells were confirmed to have mesenchymal phenotype by expression of specific markers (CD90, CD105, and CD73) and absence of CD45 marker, which is specific for hematopoietic stem cells. They could differentiate into lineage-specific committed cells (osteoblasts and adipocytes).
According to the findings, the conventional, labour-intensive and time-consuming approaches are not necessary to obtain an optimal number of cells from peripheral blood. This relatively accessible and minimally invasive source of stem cells may open a new era for practical exploitation in regenerative medicine.- انتشار مقاله: 22-03-1396
- نویسندگان: Noushin Pouryazdanpanah,Shahriar Dabiri,Ali Derakhshani,Reza Vahidi,Alireza Farsinejad
- مشاهده