Navegando por Palavras-chave "Cimetidine"

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    Cimetidine Reduces Interleukin-6, Matrix Metalloproteinases-1 and-9 Immunoexpression in the Gingival Mucosa of Rat Molars With Induced Periodontal Disease
    (Amer Acad Periodontology, 2017) Oliveira, Priscila Aparecida de [UNIFESP]; Pizzol Junior, Jose Paulo de [UNIFESP]; Longhini, Renata [UNIFESP; Sasso-Cerri, Estela; Cerri, Paulo Sergio
    Background: Histamine seems to act, via H-2 receptor, on inflammatory processes by stimulating interleukin (IL)-6 and matrix metalloproteinase (MMP) release. As cimetidine is an H-2 receptor antagonist, the authors hypothesize that this antiulcer drug reduces IL-6, MMP-1, andMMP-9immunoexpressioningingiva with inducedperiodontal disease (PD). Toconfirmapossible modulatory role of IL-6 on MMPs, the relationship between IL-6/MMP-1 and IL-6/MMP-9 immunoexpression was evaluated. Methods: Forty-six male rats were distributed into the cimetidine group (CimG: received daily intraperitoneal injections of 100 mg/kg of body weight of cimetidine) or the saline group (SG). PD was induced by cotton ligature around the maxillary left first molars (PDSG and PDCimG). The right molars were used as controls (SG and CimG). After 7, 15, 30, and 50 days, maxillary fragments were processed for paraffin embedding or for transmission electron microscopy. Tartrateresistant acid phosphatase (TRAP)-positive osteoclasts in the alveolar process surface and number of IL-6, MMP-1, and MMP-9-immunolabeled cells in the gingival mucosa were quantified. Statistical analyses were performed (P <= 0.05). Results: In PDSG and PDCimG, gingival mucosa exhibited few collagen fibers among numerous inflammatory cells. In PDCimG, the number of TRAP-positive osteoclasts and IL-6, MMP-1, andMMP-9-immunolabeled cells was significantly lower than in PDSG at all periods. A positive correlation between IL-6/MMP-1 and IL-6/MMP-9 was detected in PDSG and PDCimG. Conclusion: Cimetidine decreases bone loss through reduction of osteoclast number and induces reduction of IL-6, MMP-1, and MMP-9 immunoexpression, reinforcing the idea that the beneficial effect of cimetidine in PD may be due to reduction of IL-6 immunolabeling in the inflamed gingival mucosa.
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    Interferência da cimetidina na histofisiologia androgênica de epidídimos de ratos
    (Universidade Federal de São Paulo (UNIFESP), 2017-03-29) Santi, Fabiane de [UNIFESP]; Cerri, Estela Sasso [UNIFESP]; http://lattes.cnpq.br/4455630076841302; http://lattes.cnpq.br/6811833354624192; Universidade Federal de São Paulo (UNIFESP)
    Hormonal disorders and changes in the reproductive tract have been related to antiandrogenic effect of cimetidine. Thus, androgen-dependent structural and functional parameters of epididymis were investigated. Male rats received 100mg/kg cimetidine (CMTG) or saline (CG) for 50 days, and the epididymal cauda region was processed for light and transmission electron microscopy. Epididymal duct diameter and stromal collagen were evaluated. TUNEL-labeled epithelial cells, and AR, KPNA and SHBG immunolocalization were analyzed. In CMTG, the duct diameter reduced and a high number of TUNEL-labeled cells was associated to apoptotic features. In the epithelium, a weak/absent AR nuclear immunofluorescence was observed in contrast to enhanced AR-immunolabeled cytoplasm and reduced KPNA immunoreactivity. The collagen and SHBG levels reduced in the stroma. Cimetidine induced epithelial androgenic dysfunction due to impairment of AR nuclear import. These changes may be result of androgen unavailability in the stroma and/or to a direct cimetidine antiandrogenic effect on epithelial cells.