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The present study aimed to evaluate the new heterologous fibrin biopolymer associated, or not, with photobiomodulation therapy for application in tendon injuries, considered a serious and common orthopedic problem. Thus, 84 Rattus norvegicus had partial transection of the calcaneus tendon (PTCT) and were randomly divided into: control (CG); heterologous fibrin biopolymer (HFB); photobiomodulation (PBM); heterologous fibrin biopolymer + photobiomodulation (HFB + PBM). The animals received HFB immediately after PTCT, while PBM (660 nm, 40 mW, 0.23 J) started 24 h post injury and followed every 24 h for 7, 14, and 21 days. The results of the edema volume showed that after 24 h of PTCT, there was no statistical difference among the groups. After 7, 14, and 21 days, it was observed that the treatment groups were effective in reducing edema when compared to the control. The HFB had the highest edema volume reduction after 21 days of treatment. The treatment groups did not induce tissue necrosis or infections on the histopathological analysis. Tenocyte proliferation, granulation tissue, and collagen formation were observed in the PTCT area in the HFB and HFB + PBM groups, which culminated a better repair process when compared to the CG in the 3 experimental periods. Interestingly, the PBM group revealed, in histological analysis, major tendon injury after 7 days; however, in the periods of 14 and 21 days, the PBM had a better repair process compared to the CG. In the quantification of collagen, there was no statistical difference between the groups in the 3 experimental periods. The findings suggest that the HFB and PBM treatments, isolated or associated, were effective in reducing the volume of the edema, stimulating the repair process. However, the use of HFB alone was more effective in promoting the tendon repair process. Thus, the present study consolidates previous studies of tendon repair with this new HFB. Future clinical trials will be needed to validate this proposal.
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http://dx.doi.org/10.1007/s10103-021-03341-x | DOI Listing |
Biology (Basel)
November 2024
Laboratory of Nerve Regeneration, University of Campinas (UNICAMP), Campinas 13083-865, SP, Brazil.
Spinal cord injury results in significant motor and sensory loss. In the experimental ventral root avulsion (VRA) model, the ventral (motor) roots are disconnected from the spinal cord surface, disrupting contact between spinal motoneurons and muscle fibers. Axotomized motoneurons typically degenerate within two to three weeks after avulsion, the situation being exacerbated by an increased glial response and chronic inflammation.
View Article and Find Full Text PDFLasers Med Sci
November 2024
Scientific and Technological Institute, Universidade Brasil, Sao Paulo (SP), Brazil.
Diabetes mellitus is characterized by elevated blood glucose levels causing sometimes impairment of the body's ability to repair itself. Promising treatments for tissue repair have included photobiomodulation therapy and heterologous fibrin biopolymer (HFB). This study aimed to evaluate the impact of photobiomodulation therapy by LED, both as a standalone treatment and in conjunction with heterologous fibrin biopolymer in treatment of skin lesions of diabetic rats.
View Article and Find Full Text PDFCell Transplant
October 2024
Takeda-CiRA Joint Program for iPS Cell Applications (T-CiRA), Fujisawa, Japan.
In the development of cell therapy products, immunocompromised animal models closer in size to humans are valuable for enhancing the translatability of findings to clinical trials. In the present study, we generated immunocompromised type 1 diabetic Göttingen mini-pig models and demonstrated the engraftment of human-induced pluripotent stem cell-derived pancreatic islet cells (iPICs). We induced hyperglycemia with a concomitant reduction in endogenous C-peptide levels in pigs that underwent thymectomy and splenectomy.
View Article and Find Full Text PDFMaterials (Basel)
September 2024
Postgraduate Program in Structural and Functional Interactions in Rehabilitation, Postgraduate Department, University of Marilia (UNIMAR), Marilia 17525-902, Brazil.
J Venom Anim Toxins Incl Trop Dis
May 2024
Department of Biological Sciences, Bauru School of Dentistry (FOB), University of São Paulo (USP), Bauru, SP, Brazil.
Background: In this experimental protocol, we evaluated the immediate and delayed repair of the buccal branch of the facial nerve (BBFN) with heterologous fibrin biopolymer (HFB) as a coaptation medium and the use of photobiomodulation (PBM), performing functional and histomorphometric analysis of the BBFN and perioral muscles.
Methods: Twenty-eight rats were divided into eight groups using the BBFN bilaterally (the left nerve was used for PBM), namely: G1 - control group, right BBFN (without injury); G2 - control group, left BBFN (without injury + PBM); G3 - Denervated right BBFN (neurotmesis); G4 - Denervated left BBFN (neurotmesis + PBM); G5 - Immediate repair of right BBFN (neurotmesis + HFB); G6 - Immediate repair of left BBFN (neurotmesis + HFB + PBM); G7 - Delayed repair of right BBFN (neurotmesis + HFB); G8 - Delayed repair of left BBFN (neurotmesis + HFB + PBM). Delayed repair occurred after two weeks of denervation.
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