Navegando por Assunto "Terapia celular"

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Acesso aberto (Open Access)
Alterações morfo-funcionais em córtex isquêmico de animais tratados com transplante autólogo de células mononucleares da medula óssea
(Universidade Federal do Pará, 2015-10-08) BARBOSA JUNIOR, Mário Santos; PEREIRA JÚNIOR, Antônio; http://lattes.cnpq.br/1402289786010170; BAHIA, Carlomagno Pacheco; http://lattes.cnpq.br/0910507988777644
Statistical data show stroke as the second leading cause of death and leading cause of disability among all other diseases in the world. The ischemic stroke (ischemic stroke) accounts for about 87% of incidence of strokes. In ischemic stroke, inflammation acts in restraint of infarction caused by ischemic stroke, and on the other hand the intensity of the inflammatory response in neurodegeneration and consequently influence the functional loss. The autologous cell therapy, mononuclear bone marrow cells, promotes modulation in neuroinflammation, being timely during an ischemic event for reduction of tissue loss and functional. In the present study, we used an experimental model of focal ischemic stroke to assess morphological and functional effects of autologous implant mononucleres bone marrow cells (CMMOs) on the morphological and functional changes related to ischemic stroke. We demonstrate in this study that the autologous BM-MNC in acute or acute and subacute periods of ischemic event, promoted neuroprotection and inflammatory modulation able to rebound in preservation and functional recovery in specific activities. We also show that the treatment enhanced in subacute period, the ischemic event, was able to promote increase in morphological and functional improvements promoted by autologous transplantation in acute period.
Acesso aberto (Open Access)
Efeitos do transplante autólogo de células monocelulares da medula óssea após lesão incompleta da medula espinhal de ratos adultos
(Universidade Federal do Pará, 2017-03-30) SOUZA, Celice Cordeiro de; HAMOY, Moisés; http://lattes.cnpq.br/4523340329253911; LEAL, Walace Gomes; http://lattes.cnpq.br/2085871005197072
Spinal cord injury (SCI) causes permanent loss of neurological function below the level of injury, generating social and psychological physical consequences in patients. The pathophysiology of SCI involves complex processes, such as hemorrhage, excitotoxicity and inflammation, mainly generated by microglial cells. Despite advanced knowledge of pathological mechanisms, effective and approved therapeutic strategies for the treatment of lesions and their consequences are still lacking without serious adverse effects. Cell therapy may represent a good therapeutic strategy because it demonstrates good results in the modulation of the inflammatory environment of the lesion and by probable mechanisms of differentiation. In the present study, we investigated the action of bone marrow mononuclear cells (BMMC) in incomplete lesions (hemisection to the right of the spinal cord, T8-T9 segment) after 42 days of injury (chronic lesion). The cells were from the injured animal itself (autologous transplantation) and the transplantation was intramedullary, i.e. the cells were inserted near the site of the lesion. In the present study, the functional effects of transplantation were investigated through the BBB scale (Basso, Beatie and Bresnahan), which allows the motor function of the hind legs of the animals to be graded. The anti-inflammatory effects of BMMC were also investigated. Histological and immunohistochemical techniques using Cresila Violet staining and anti-ED-1 (microglial marker / activated macrophages) and anti-GFAP (fibrillar astrocyte marker) antibodies were used. Qualitative and quantitative analyzes were performed. For quantitative analysis, the number of field activated astrocytes and macrophages / microglia were counted using binocular microscope with counting gradient (0.0625mm2) in a 40x objective. The counting averages and the standard deviations obtained were plotted in Cartesian coordinates. The counting was as follows: on the right side of the spinal cord (lesion side) and three fields per medullary region (ventral funiculus - FV, dorsal funiculus - FD, lateral funiculus - FL, dorsal horn - CD, ventral horn - CV and intermediate gray matter-SCI), totaling 18 counting fields per section. Treatment with BMMC was not effective in improving the motor function of the injured animals when we compared the treated and untreated animals (means and standard deviations of the groups: false operated, n = 4, 21 ± 0, control, n = 4, 13,57 ± 3.88, treated, n = 5, 15.07 ± 3.46). In the qualitative analysis by means of the staining of Cresila Violet, treated animals presented better tissue preservation when compared to the untreated animals. In the quantitative analysis of microglial activation, we observed that treatment with BMMC reduced the activation of these inflammatory cells (control: 19.52 ± 7.79, treated: 10.04 ± 2.37), but did not significantly reduce the activation of the astrocytes (Mean of the groups: control 17.74 ± 2.757, treated 14.46 ± 5.283). The results suggest that further studies are needed to come up with an effective strategy for patients with SCI. A possible combined treatment with other strategies may turn out to be promising for patients' functionality.
Acesso aberto (Open Access)
O tratamento com meio condicionado em cultura primária de tenócitos acelera o reparo tendíneo em modelo de lesão total do tendão calcâneo
(Universidade Federal do Pará, 2022-10-14) MACIEL, Analú Alves; SILVA, Anderson Manoel Herculano Oliveira da; http://lattes.cnpq.br/8407177208423247
Conventional treatments for tendinopathies are ineffective and most clinical interventions do not provide adequate recovery leaving this tissues more likely to suffer reinjures. Recently, cell based therapies has been shown to be effective for the treatment in connective tissue injuries, such as tendons. Our aim is to evaluate if local treatment with tenocytes conditioned medium promoves tissue and functional improvements in the calcaneal tendon of tenotomized mice. The calcaneal tendon cells of Swiss mice were cultured for conditioning culture medium that will be used as a treatment. The animals were subjected to right calcaneal tenotomy and treated with saline solution (SAL), DMEM without serum (DMEM) and DMEM conditioned in primary tenocyte culture (MC) and compared to the control group (CTRL). Tendon functionality was measured using the Achilles Functional Index (AFI) and mechanical sensitivity through the paw withdrawal threshold (PWT) using the Von Frey test. All analyzes were performed at 7, 14 and 21 days post-injury (dpi). For histological analysis, tissues were stained with HE. Statistics were performed by ANOVA-2 followed by Tukey's post test, p<0.01. The MC group showed functional improvement at 7° and 14°dpi (-40.4±12.6; -36.6±10.4) compared to the DMEM groups (-76.5±11.7; -71, 6±7.9, p<0.01) and SAL (-88.8±15; -71.4±12.6 p<0.01). The MC group showed improvement in the paw withdrawal threshold at 7° and 14°dpl (2.24±1.15; 2.66±1.06) compared to the DMEM groups (0.15±0.07; 0 .45±0.76 p<0.01) SAL (0.13±1.15; 0.77±0.95 p<0.01). In the histological analysis, the MC group showed better tissue organization with cells presenting a format more similar to the control group, while the SAL and DMEM groups were more different from this one. We conclude that treatment with tenocytes conditioned medium accelerates tendon recovery, promoving improvement in mechanical sensitivity, functionality and tissue organization in the proposed injury model.