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Imunomarcação da PECAM-1 e da osteocalcina no processo de reparo de enxerto ósseo autógeno em bloco em ratas ovariectomizadas jovens e senis: estudo histométrico e imunoistoquímico

Authors: Murakawa, Ana Cristina;

Imunomarcação da PECAM-1 e da osteocalcina no processo de reparo de enxerto ósseo autógeno em bloco em ratas ovariectomizadas jovens e senis: estudo histométrico e imunoistoquímico

Abstract

Objetivos: O objetivo deste estudo foi avaliar a influência da ovariectomia (depleção de estrógeno), no processo de reparo de enxertos ósseos autógenos em bloco por meio da imunomarcação da PECAM-1 e osteocalcina (OCN), em ratas jovens e senis. Material e Métodos: Foram utilizadas 96 ratas (Wistar) fêmeas, sendo 48 ratas com idade de 3 meses, divididas em subgrupo Ovx, submetidas a cirurgia de ovariectomia e subgrupo Sham submetidas ao mesmo procedimento cirúrgico sem a remoção dos ovários; e 48 ratas com idade de 12 meses, também divididas em subgrupos Ovx e Sham. Transcorridos 30 dias da Ovx ou sham, todos os animais receberam enxerto ósseo autógeno em bloco na mandíbula, tendo como área doadora o osso parietal da calvária. Os animais foram submetidos a eutanásia em 7, 14 e 28 dias. As peças foram submetidas à análises histométrica e imunoistoquímica. Esta foi realizada de forma semi-quantitativa, visando analisar as imunomarcações contra PECAM-1 e osteocalcina, avaliando-se a interferência do estrógeno neste processo. Resultados: Durante os períodos analisados, os subgrupos Sham apresentaram marcações da osteocalcina mais intensas quando comparadas com os subgrupos Ovx, independente da idade do animal. As marcações de PECAM-1 foram mais intensas nos subgrupos Sham aos 7 e 14 dias. Conclusão: Dentro dos limites deste estudo, concluímos que a depleção de estrógeno afeta negativamente o processo inicial da angiogênese e diminui a mineralização óssea.

Objectives: The aim of this study was to evaluate the influence of the ovariectomy (estrogen depletion), on healing process of autogenous bone block grafts in young and aged rats, through the immunocolocalization of the PECAM-1 and osteocalcin (OC). Material and Methods: 96 female rats (Wistar) were used, being 48 rats with 3 months-old, divided in subgroups: Ovx, submitted the ovariectomy surgery and Sham, submitted to the same surgical procedure without the removal of the ovaries; and 48 female rats with 12 months-old, also divided in Ovx and Sham subgroups. After 30 days of Ovx or sham operation, all the animals received autogenous bone block graft in the jaw, harvested from the calvaria. The animals were euthanized in 7, 14 and 28 days postoperatively. The specimens were submitted to histometric and immunohistochemistry analysis. This was accomplished in a semi-quantitative way, to analyze the immunolocalizations against PECAM-1 and osteocalcin, evaluating the interference of the estrogen in this process. Results: During the analyzed periods, the Sham subgroups presented more intenses demarcations of osteocalcin when compared with the subgroups Ovx, regardless of age. The demarcations of PECAM-1 were more intenses in the sham subgroups to the 7 and 14 days. Conclusion: Within the limits of this study, the estrogen depletion affects the initial process of angiogenesis negatively and it reduces bone mineralization.

Pós-graduação em Odontologia - FOA

Country
Brazil
Keywords

Estrogênios, Imunoistoquímica, Ovariectomy, Osteocalcin, Imuno-histoquímica, Ovariectomia, Regeneração óssea, Estrogens, Ossos - Regeneração, Immunohistochemistry, Osteocalcina, Bone regeneration

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
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