scholarly journals Immunohistochemical study for relationship between vessel and lymphatic properties and tooth marks in human oral mucosa

2020 ◽  
Vol 64 (1) ◽  
Author(s):  
Toru Inomata ◽  
Yoko Miwa ◽  
Shinichi Kawata ◽  
Takuya Omotehara ◽  
Iwao Sato ◽  
...  
Keyword(s):  
Cell Differentiation ◽  
Mechanical Stress ◽  
Oral Mucosa ◽  
Tumour Progression ◽  
Muscle Tension ◽  
Principal Component ◽  
Positive Association ◽  
Ki 67 ◽  
Second Molar ◽  
Tooth Marks

Angiogenesis is an important issue related to normal growth and differentiation, and it is a critical issue in the progression of human disease in oral mucosa. Tooth marks occur after clenching the teeth for a long period under muscle tension in the human oral cavity. However, the sites of angiogenesis, cell differentiation and microvessel density are not known for human mucosa with tooth marks. Therefore, we investigated the relationship between the markers of differentiation (Ki-67), angiogenesis (CD31, D2-40, VEGF-A), and marks from teeth in the second molar region using immunohistochemical methods. In addition, we compared these areas with the mucous membrane. Our results revealed blood and lymphoid vessels in irregular mucosa structures, and the vessels in the oral mucosa were observed in three types of samples: dentulous, denture attachment (containing partial teeth), and edentulous samples. The localization of the angiogenesis was related to the structure of the oral mucosa of connective tissue in humans, such as the mucosal fold-like of the buccal region. Using principal component analysis (PCA), we found that tooth occlusal condition, gender, anti-VEGF-A reaction levels in oral mucosa of the epithelium were positive factors in all groups, which is in contrast to the negative association of Ki-67 reaction in the epithelium and CD31 expression. In addition, Ki-67 reaction in oral mucosa had negative impacts, in contrast to the positive association of D2-40. These PCA properties provide useful information for future study of tumour progression or mechanical stress in remodelling of oral mucosa and angiogenesis. Moreover, mechanical stress of the occlusal condition may be correlated with tumour angiogenic activity and cell differentiation in human oral mucosa.

Ethanolic Extract of Algerian Propolis and Galangin Decreased Murine Melanoma Tumor Progression in Mice

2016 ◽  
Vol 16 (9) ◽  
pp. 1172-1183 ◽  
Author(s):  
Lamia Benguedouar ◽  
Mesbah Lahouel ◽  
Sophie C. Gangloff ◽  
Anne Durlach ◽  
Florent Grange ◽  
...  
Keyword(s):  
Tumour Growth ◽  
Tumour Progression ◽  
Ethanolic Extract ◽  
Complementary Therapy ◽  
Melanoma Cells ◽  
Biological Properties ◽  
Therapeutic Treatment ◽  
Melanoma Tumor ◽  
Ki 67

Melanoma is the more dangerous skin cancer, and metastatic melanoma still carries poor prognosis. Despite recent therapeutic advances, prolonged survival remains rare and research is still required. Propolis extracts from many countries have attracted a great deal of attention for their biological properties. We here investigated the ability of an ethanolic extract of Algerian propolis (EEP) to control melanoma tumour growth when given to mice bearing B16F1melanoma tumour either as preventive or as therapeutic treatment. EEP given after tumour occurrence increased mice survival (+30%) and reduced tumour growth (-75%). This was associated with a decrease of the Mitotic Index (-75%) and of Ki-67 (-50%) expression. When given either before or both before and after tumour occurrence, EEP reduced tumour growth but without prolonging mice life. Isolation of B16F1 melanoma cells from resected tumour showed that preventive and curative EEP treatments reduced invasiveness by 55% and 40% respectively compared to control. Galangin, one of the most abundant flavonoids in propolis, significantly reduced the number of melanoma cells in vitro and induced autophagy/apoptosis dose dependently. In conclusion, we showed that EEP reduced melanoma tumour progression/dissemination and could extend mice lifespan when used as therapeutic treatment. Then, EEP may help patients with melanoma when used as a complementary therapy to classical treatment for which autophagy is not contraindicated.

Cell cycle-dependent reactivity with the monoclonal antibody Ki-67 during myeloid cell differentiation

1988 ◽  
Vol 179 (1) ◽  
pp. 79-88 ◽  
Author(s):  
Robert P. Wersto ◽  
Fritz Herz ◽  
Robert E. Gallagher ◽  
Leopold G. Koss
Keyword(s):  
Cell Cycle ◽  
Monoclonal Antibody ◽  
Cell Differentiation ◽  
Myeloid Cell ◽  
Ki 67 ◽  
Cycle Dependent

scholarly journals Analysis of the immunohistochemical expressions of p53, bcl-2 and Ki-67 in colorectal adenocarcinoma and their correlations with the prognostic factors

2010 ◽  
Vol 47 (2) ◽  
pp. 141-147 ◽  
Author(s):  
Hunaldo Lima de Menezes ◽  
Mário Jorge Jucá ◽  
Edmundo Guilherme de A. Gomes ◽  
Benício L. Bulhões B. P. Nunes ◽  
Henrique Oliveira Costa ◽  
...  
Keyword(s):  
Prognostic Factors ◽  
Cell Differentiation ◽  
Colorectal Adenocarcinoma ◽  
Sao Paulo ◽  
Immunohistochemical Expression ◽  
Ki 67 ◽  
Disease Free Interval ◽  
Free Interval ◽  
Specific Mortality ◽  
Disease Free

CONTEXT: Search of tumors markers that allow treatment with higher survival rates, and indicate the response to treatment and recurrence of cancer OBJECTIVE: To analyze the immunoexpression of the proteins p53, bcl-2 and Ki-67 in colorectal adenocarcinoma and correlate them with the clinical-pathological prognostic factors. METHOD: Tissue microarray paraffin blocks were made from colorectal adenocarcinoma tissue resected from 82 patients who had undergone surgery but not chemotherapy or radiotherapy, at "Hospital São Paulo", São Paulo, SP, Brazil, between 2002 and 2005. Thin sections (4 µm) were subjected to immunohistochemical reactions, and immunoexpression staining scores were obtained. The scores were correlated with the degree of cell differentiation, staging, disease-free interval, recurrence, survival and specific mortality. The study variables were analyzed using the chi-square and Kaplan-Meier tests to investigate associations with the markers. The significance of the differences between the curves of the disease-free interval and survival was analyzed using the Logrank and Wilcoxon tests. RESULTS: The immunohistochemical expression of p53 was positive in 70 tumors (85.4%) and negative in 12 (14.6%). The expression of bcl-2 was positive in 26 (31.7%) and negative in 56 (68.3%). The expression of Ki-67 was positive in 62 (75.6%) and negative in 20 (24.4%). There was no statistically significant correlation between the expressions of these markers separately or in conjunction, in relation to the degree of cell differentiation, staging, disease-free interval, survival and specific mortality. In relation to recurrence, there was a statistically significant correlation with positive expression of Ki-67 (P = 0.035). CONCLUSION: The immunohistochemical expression of Ki-67 in colorectal cancer is associated with recurrence of this disease.

scholarly journals Developing a deprivation index to study geographical health inequalities in Ecuador

2019 ◽  
Vol 53 ◽  
pp. 97
Author(s):  
Andrés Peralta ◽  
Verónica Espinel-Flores ◽  
Mercè Gotsens ◽  
Glòria Pérez ◽  
Joan Benach ◽  
...  
Keyword(s):  
Health Inequalities ◽  
Principal Component ◽  
Positive Association ◽  
Well Being ◽  
Deprivation Index ◽  
Population Census ◽  
Subjective Well Being ◽  
Poisson Regression Model ◽  
Geographic Pattern ◽  
Standardised Mortality Ratios

OBJECTIVES: To develop a deprivation index to study health inequalities in 221 areas of Ecuador, to describe the pattern of deprivation in Ecuador, and to explore the applications of the index to study health inequalities by analysing the association between deprivation and mortality in the study areas. METHODS: We performed principal component analyses of available indicators of the 221 cantons of Ecuador. A set of 41 sociodemographic, social capital, and subjective well-being variables were obtained from the 2010 National Population Census and the National Living Conditions Survey 2013–2014. To explore the application of the index in public health, the association between the index and standardised mortality ratios was estimated through a Poisson regression model. RESULTS: The final index was constructed with 17 indicators. The first component explained 51.8% of the total variance of the data. A geographic pattern and a positive association of the index with the standardised mortality ratios of the cantons were observed in both men and women. CONCLUSIONS: We constructed a deprivation index that can identify disadvantaged areas in Ecuador. This index could be a valuable tool for the detection of vulnerabilised populations and the development of interventions and policies adapted to local needs.

Production and characterization of an in vitro engineered human oral mucosa

2002 ◽  
Vol 80 (2) ◽  
pp. 189-195 ◽  
Author(s):  
Mahmoud Rouabhia ◽  
Noëlla Deslauriers
Keyword(s):  
Tissue Engineering ◽  
Epithelial Cells ◽  
Oral Mucosa ◽  
Oral Diseases ◽  
Ki 67 ◽  
Necrosis Factor Alpha ◽  
Engineering Technology ◽  
Cell Monolayers ◽  
Factor Alpha

The role of epithelial cells in oral pathologies is poorly understood. Until now, most studies have used normal or transformed epithelial cell monolayers, a system that largely bypasses oral mucosal complexity. To overcome these limitations, an engineered human oral mucosa (EHOM) model has been produced and characterized. Following histological and immunohistochemical analyses, EHOM showed well-organized and stratified tissues in which epithelial cells expressed proliferating keratins such as Ki-67, K14, and K19 and also differentiating keratin (K10). In this model, epithelial cells interacted with fibroblasts in the lamina propria by secreting basement membrane proteins (laminins) and by expressing integrins (β1 and α2β1). Cytokine analyses using cultured supernatants showed that cells in EHOM were able to secrete interleukins (IL) including IL-1β and IL-8 and tumor necrosis factor alpha (TNF-α). Finally, cells in this engineered model were able to secrete different metalloproteinases such as gelatinase-A and gelatinase-B. In conclusion, using tissue engineering technology, we produced well-organized EHOM tissues. It is anticipated that this model will be useful for examining mechanisms involved in oral diseases under controlled conditions by modeling the interactions between mucosa and microorganisms in the oral cavity.Key words: tissue engineering, oral mucosa, periodontitis, keratinocytes, fibroblasts.

Expression of Minichromosome Maintenance 2 (MCM2), Ki-67, and Cell-Cycle-Related Molecules, and Apoptosis in the Normal-Dysplasia-Carcinoma Sequence of the Oral Mucosa

Pathobiology ◽  
2001 ◽  
Vol 69 (3) ◽  
pp. 150-158 ◽  
Author(s):  
Isamu Kodani ◽  
Kohei Shomori ◽  
Mitsuhiko Osaki ◽  
Itaru Kuratate ◽  
Kazuo Ryoke ◽  
...  
Keyword(s):  
Cell Cycle ◽  
Oral Mucosa ◽  
Minichromosome Maintenance ◽  
Ki 67

Mineral relationships in 'maturity bronzing' of banana fruit

1978 ◽  
Vol 18 (95) ◽  
pp. 803 ◽  
Author(s):  
SJ Campbell ◽  
WT Williams
Keyword(s):  
Seasonal Pattern ◽  
Principal Component ◽  
Positive Association ◽  
Mineral Elements ◽  
Stepwise Multiple Regression ◽  
Direct Result ◽  
Seasonal Effect ◽  
Banana Fruit ◽  
Mineral Imbalance ◽  
Fruit Skin

Two experiments have been conducted to explore the relations between the economically important disorder 'maturity bronzing' and a number of mineral elements. Neither irrigation nor fertilizer treatments had any significant effect on the degree of bronzing. In order to eliminate the highly significant seasonal effect, analyses were carried out on deviations from the appropriate harvest means. The techniques employed were a. stepwise multiple regression, and 6, principal component analysis of the within-harvests correlation matrix, followed by varimax rotation. The results suggest that fertilizer treatments can produce profound changes in the seasonal pattern of mineral content without significantly affecting the incidence of bronzing. When the effect of season is eliminated, bronzing shows a positive association with fruit-skin Cu and leaf Ca, and a negative association with fruit-skin Ca and Mg. However, these associations are relatively weak, and the results suggest that bronzing is not a direct result of mineral imbalance.

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