Histology and histopathology Vol.31, nº6 (2016)

Ir a Estadísticas

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    Probiotic (yogurt) containing Lactobacillus gasseri OLL2716 is effective for preventing Candida albicans-induced mucosal inflammation and proliferation in the forestomach of diabetic rats
    (Universidad de Murcia. Departamento de Biología Celular e Histología, 2016) Terayama, Yui; Matsuura, Tetsuro; Uchida, Masayuki; Narama, Isao; Ozaki, Kiyokazu
    Oral and esophageal candidiasis sometimes leads to mucosal hyperplasia, and progresses to carcinoma. We have produced an animal model for hyperplastic mucosal candidiasis in the forestomach that has a proliferative lesion of the squamous epithelium with chronic inflammation and C. albicans infection, some of which advanced to squamous cell carcinoma. There are many reports of the antibacterial effects of probiotics, but consensus about their antifungal effect has not been reached. In the present study, we investigate whether probiotic (yogurt) containing Lactobacillus gasseri OLL2716 (LG21 yogurt) can prevent proliferative and inflammatory changes caused by C. albicans in this mucosal candidiasis animal model. Diabetes was induced in 8-week-old WBN/Kob rats by intravenous administration of alloxan. One group of diabetic rats received a saline containing C. albicans and LG21 yogurt orally (DC+LG21 group) for 30 weeks, and another group received only C. albicans (DC group) for 30 weeks. They were sacrificed at 40 weeks of age, and analyzed histopathologically. In the DC+LG21 group, squamous hyperplasia at the greater curvature was significantly milder, and the Ki-67 positive index was significantly lower compared with the DC group. Suppurative inflammation with C. albicans also tended to be suppressed at the greater curvature. These findings suggest that probiotic (yogurt) containing Lactobacillus gasseri OLL2716 can suppress squamous hyperplastic change and inflammation associated with C. albicans infection in the forestomach.
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    Relationship between the expression of versican and EGFR, HER-2, HER-3 and CD44 in matrix-producing tumours in the canine mammary gland
    (Universidad de Murcia. Departamento de Biología Celular e Histología, 2016) Damasceno, K.A.; Ferreira, E.; Estrela-Lima, A.; Bosco, Y.; Silva, L.P.; Barros, A.L.B.; Bertagnolli, A.C.; Cassali, G.D.
    Versican is an extracellular matrix proteoglycan that has been identified as a modulator of adhesion loss, cell motility, and tumour progression. This motility results from the interaction between versican and cell surface receptors. Studies have also demonstrated the relationship between this molecule and invasion in canine mammary tumours. Given the evidence for the participation of proteoglycans in tumour progression, this study aimed to assess versican expression and its association with cell surface receptors; human epidermal growth factor receptors 1, 2, and 3 (EGFR, HER-2, and HER-3) and CD44 through an immunohistochemical analysis of benign mixed tumours (BMTs), carcinomas in mixed tumours (CMTs), and carcinosarcomas (CSs) of the canine mammary gland. Malignant tumours were divided into low and high groups with respect to versican stromal expression. The results indicated that the BMTs showed weak stromal versican expression and correlations between the expression of stromal versican and EGFR in the epithelial membrane in benign areas (p=0.013, r=0.571). A higher stromal versican expression was observed adjacent to invasive epithelial areas compared with in situ areas in CMTs and CSs, suggesting a direct relationship between versican expression and invasiveness. Furthermore, the CSs exhibited a higher expression of HER-2, cytoplasmic HER-3, and CD44 in epithelial invasive cells in cases of higher stromal versican expression. Therefore, the cell surface receptors (HER-2, HER-3, and CD44) are more evident in CSs that overexpress versican in stroma adjacent to the invasive areas. These findings suggest that the association between these molecules may be directly related to the biological behaviour and invasiveness of these canine mammary tumours.
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    Adrenomedullin regulates club cell recovery following lung epithelial injury
    (Universidad de Murcia. Departamento de Biología Celular e Histología, 2016) García-Sanmartín, Josune; Larrayoz, Ignacio M.; Martínez, Alfredo
    The equilibrium between lung epithelium damage and recovery in the context of chronic injury is at the basis of numerous lung diseases, including lung cancer and COPD. Understanding the contribution of growth factors and other molecular intermediates to this crosstalk may help in devising new therapeutic approaches. To better understand the contribution of adrenomedullin (AM) to lung homeostasis, we built club cell-specific conditional knockout (KO) mice for AM and subjected them to naphthalene injury. Untreated KO mice had lower levels of club cell 10 KDa protein (CC10) immunoreactivity than their wild type (WT) littermates in both terminal and regular bronchioles. Naphthalene injury resulted in a rapid necrosis of club cells followed by a progressive recovery of the epithelium. Club cells proliferated at higher rates in the KO mice and at 21 days post-injury the club cell coverage of the main bronchioles was higher and more homogeneous than in the WT animals. In conclusion, the paracrine/autocrine influence of AM in club cells subtly modulates their proliferation and spreading kinetics during lung epithelium recovery.
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    Structure of the rat tracheal mucosa after chronic intermittent hypoxia or chronic hyperbaric oxygen therapy
    (Universidad de Murcia. Departamento de Biología Celular e Histología, 2016) Vera-Cruz, Paulo; Rito, Miguel; Diogo, Lucília; Zagalo, Carlos; dos Santos, José Martins; Monteiro, Maria Emília
    . Objective: This paper is aimed at identifying putative morphological changes induced in the rat’s tracheal mucosa by chronic hyperbaric oxygen (HBO) treatment or chronic intermittent hypoxia (CIH). Study Design: Tracheal samples were obtained from three groups of 11, 12 and 13 adult Wistar rats. The first group was submitted to 20 sessions of 100 min-long HBO treatment; the second group was submited to eucapnic CIH for 35 days; and the third group was not submitted to any CIH or HBO therapy. Methods: Four proximal tracheal rings were collected after sacrifice and neck dissection of the animals. The samples were processed for both light microscopy and morphometric analysis. Inflammatory leukocyte infiltration was evaluated by a semiquantitative method. Unpaired t test and Bernoulli distribution were applied to evaluate statistical differences in the data collected from the three groups. Results: Both CIH and HBO promote an increase in the thickness of the epithelium and of the basement membrane of the rat tracheal mucosa, as well as an increment in the number of infiltrating leukocytes, when compared with results seen in the untreated group. In the HBO group there was a significant lack of seromucous glands, as opposed to the results obtained in the CIH group. Conclusions: Chronic HBO and CIH exposure causes only minor changes in the architecture of the tracheal mucosa of the rat. The respiratory tract of the rat showed a mild inflammatory response when subject to variations of pressure and oxygen content. Apparently these effects do not constitute a critical issue on prescribing HBO treatments and in the management of sleep apnea patients.
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    Effects of low dose of tibolone on steroid receptors and Bcl-2 on the postmenopausal endometrium
    (Universidad de Murcia. Departamento de Biología Celular e Histología, 2016) Reis, Benedito Fabiano; Lima, Sonia Maria Rolim R.; Silva, Gustavo Maximiliano D.; Francisco, Antonio Marcos C.; Barbosa, Lyliana Coutinho R.; Archangelo, Silvania C. Vieira; Grande, Rogerio M.
    Objective: A prospective randomized controlled trial was conducted to evaluate the effect of low dose of tibolone on the histology, expression of estrogen (ER) and progesterone receptors (PR) and Bcl2 protein, in endometrium of postmenopausal women. Method: Forty postmenopausal women consented to treatment and were allocated into two groups of 20 women: Group 1 (Control) without hormone replacement therapy (HRT); Group 2 (Tibolone) treatment at the dose of 1.25 mg/day of oral tibolone administered for a 24-week period. The effect on the endometrium was assessed by histology and the apoptosis marker Bcl-2. The immunoexpression of ER and PR were also measured. Results: Tibolone group showed higher expression of ER, PR and Bcl-2 protein in glandular epithelium and stroma compared to control group. Conclusion: Tibolone in a daily dose of 1.25 mg during 24 weeks demonstrated endometrial action that resulted in low proliferation and was shown to lead to atrophic endometrium. It had favorable effects on the postmenopausal endometrium due to its higher immunoexpression of PR and Bcl-2 protein in endometrial glandular epithelium, thereby creating a balance between pro-apoptotic and anti-apoptotic actions.