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| Author(s): |
Ricardo Vinicius Nunes Arantes
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Bauru. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Odontologia de Bauru (FOB/SDB) |
| Defense date: | 2011-12-16 |
| Examining board members: |
Rumio Taga;
Tânia Mary Cestari;
Mariza Akemi Matsumoto
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| Advisor: | Rumio Taga |
| Abstract | |
Objective: To evaluate the effect of Meloxicam on the expression of VEGF and its receptors during the post-extraction alveolar healing in rats. Material and Methods: The extraction of the right upper incisor was made in 180 male Wistar rats, aged 60 days old. The sample was divided in: 1) Control group (n=90) - the rats received intraperitoneal injection of 0.1 ml of 0.9% NaCl daily for 7 days, and 2) experimental group (n=90) - the rats received intraperitoneally 3mg/kg body weight of Meloxicam in 0.9% NaCl solution daily for 7 days. At 3, 7, 10, 14, 21 and 30 days later, the alveolar samples were collected, fixed in 10% formaldehyde in phosphate buffer, radiographed and histologically processed. For RT-PCR, the samples were placed in Trizol and stored at -80° and for Western blotting stored at -80°. Transversal semi-serial histological sections (with 250 um interval) of the whole alveolus were obtained and stained with hematoxylin and eosin. In these sections the volume density of bone tissue (% TO), connetive tissue (% CT), blood clot (Coa%) and blood vessel (% VS) was evaluated by point counting volumetry morphometric method. The obtained data were compared between groups for period by \"t\" test and between periods within each group by ANOVA and Tukey test, with a p<0.05 significance level. Results: a) The radiographic analysis showed changes in the contour of the cortical alveolar bone , reduction in size of the alveolus, and a small increase in radiodensity in their central region ; b) Morphologically the experimental group showed, in all periods, a delay in the repair process as compared to control, displaying greater amount of blood clot with slow replacement by connective tissue and lower cortical alveolar bone resorption and bone formation / remodeling c) In morphometric analysis the %TO in the control group were 0.817, 0.255, 0.368, 0.409 and 0.453 times higher than the experimental group during periods of 3, 7, 10, 14 and 21 days , respectively. The %Coa, the values in the control group were 0,097, 0,611, 1,189 and 1.497 times lower than in the experimental group on days 7, 10, 14 and 21 days respectively. The %VS in the control group showed 0.328 and 0.439 times higher than in the experimental group on days 10 and 14 days respectively. The% CT showed no statistical difference between groups. d) The imumunostaining for VEGF and VEGFR-1 were observed in osteoblasts and osteocytes in the cortical alveolar, and fibroblasts within the alveolus, which was statistically significant only for VEGFR-1, where the immunostaining in the control group was 0,544; 0,325 and 0,325 times higher than the experimental group during periods of 3, 7 and 10 days respectively e) The RT-PCR analysis for VEGF in the control group was 1.274 times higher within 10 days compared to the experimental group. In the expression of mRNA for VEGFR-1, the control group was 1,431; 0,951 and 0,845times higher in periods of 3, 10 and 30 days, respectively, compared to the experimental group and VEGFR-2 was 4.64 and 0.79 times higher in periods of 3 and 7 days, respectively, and f) The protein expression of VEGF in the control group was 0,365; 1,056; 2,187 and 0,350 times higher in periods of 3, 7, 10, 14 and 21 days compared to the experimental group. Conclusions: Based on the present results it was concluded that the use of Meloxicam, antiinflammatory administered daily for 7 days, alters the expression of mRNA and protein of VEGF and its receptors VEGFR, and slows the process of repair and remodeling post extraction alveolar (AU) | |
| FAPESP's process: | 09/11333-5 - Study of angiogenesis and temporal expression of VEGF and its receptor VEGFR-1/Flt-1 and VEGFR-2/Flk-1 during alveolar bone repair and normal therapeutic use of a non-steroidal anti-inflammatory selective for COX-2 in rats |
| Grantee: | Ricardo Vinicius Nunes Arantes |
| Support Opportunities: | Scholarships in Brazil - Master |