Angiogenic mechanisms of human dental pulp and their relationship with substance P expression in response to occlusal trauma

Angiogenesis is the formation of new blood vessels based on a pre‐existing vasculature. It comprises two processes, sprouting of endothelial cells and the division of vessels due to abnormal growth of the microvasculature. It has been demonstrated that substance P (SP) can induce angiogenesis either by modulating endothelial cell growth (direct mechanism) or by attracting cells with angiogenic potential to the injury site (indirect mechanism). Therefore, the purpose of this article is to review the angiogenic mechanisms that regulate mineralized tissue formation in human dental pulp tissue and their relationship with SP expression as a defence response to stimuli such as the masticatory function and occlusal trauma. Articles included in this review were searched in PubMed, Scopus and ISI Web of Science databases, combining the following keywords: human dentine pulp, angiogenesis, angiogenic growth factors, neuropeptides, substance P, neurogenic inflammation, dentine matrix, dentinogenesis, occlusal trauma and dental occlusion. It is concluded that human dental pulp tissue responds to occlusal trauma and masticatory function with a neurogenic inflammatory phenomenon in which SP plays an important role in the direct and indirect mechanisms of angiogenesis by the action evoked via NK1 receptors at different cells, such as fibroblasts, endothelial and inflammatory cells, leading to new blood vessel formation which are needed to stimulate mineralized tissue formation as a defence mechanism.     

Podoplanin,ezrin, and Rho-A proteins may have joint participation in tumor invasion of lip cancer

Introduction

Podoplanin and ezrin connection through Rho-A phosphorylation have been suggested as part of the activation pathway, in the process of tumor invasion and cell movement in oral squamous cell carcinomas.

Objective

The aim of this study was to evaluate the correlation among podoplanin, ezrin, and Rho-A immunoexpressions in 91 squamous cells carcinomas of the lower lip and their influence in patient’s prognosis.

Material and methods

The immunoexpressions of podoplanin, ezrin, and Rho-A were evaluated through a semi-quantitative score method, based on the capture of 10 microscopic fields at the front of tumor invasion. The association and correlation of these proteins with the clinicopathological features were verified by Fischer’s exact test and Spearman’s test. The prognostic values were analyzed by Kaplan-Meier method and log-rank test.

Results

A statistically significant association between strong cytoplasmic podoplanin expression and alcohol (p = 0.024), loco-regional recurrences (p = 0.028), and lymph node metastasis (pN+) (p = 0.010) was found. The membranous (p = 0.000 and r = 0.384) and cytoplasmic (p = 0.000 and r = 0.344) podoplanin expression was statistically correlated with ezrin expression. Also, membranous podoplanin was significantly correlated with Rho-A expression (p = 0.006 and r = 0.282). The expressions of podoplanin, ezrin, and Rho-A were not significant prognostic factors for patients with squamous cell carcinomas of the lower lip.

Conclusions

Therefore, our results confirm a correlation among podoplanin, ezrin, and Rho-A expressions in squamous cell carcinoma of the lip suggesting a cooperative participation of these proteins in cell movement and invasion.

Clinical relevance

Furthermore, strong cytoplasmic podoplanin expression could be helpful to identify patients with squamous cell carcinoma of the lip and lower risk of loco-regional recurrences.

     

Introduction: Looked‐after children

Looked‐after children (LAC) (also known as children in care) are among the most vulnerable group in our society. This is in terms of their risk of a range of poor outcomes including mental health, educational attainment and social wellbeing (Meltzer, Gatward, Corbin, Goodman, & Ford, 2003). Over the past decade, it has become increasingly clear that LAC have a higher prevalence of mental health problems than the general population, including children living with their families in ‘high‐risk’ populations. These children present with high rates of, not only emotional and behavioural problems, but also neurodevelopmental problems. The present Virtual Issue focusing on the mental health of this group of young people brings together research published in CAMH over the past 15 years.     

Mirandese language and genetic differentiation in Iberia: a study using X chromosome markers

Background: In the Iberian Peninsula, the Mirandese dialect, spoken in Miranda do Douro (Portugal) close to the north-eastern border with Spain, has attracted much attention.

Aim, subjects and methods: This study focuses on providing further insight into the connections forged between Miranda do Douro and regions in the nearby Province of Zamora. This is in order to better assess the extent to which such relations could have been detained by the current patterns of genetic diversity of the populations, whilst contributing to refining the knowledge on patterns of micro-differentiation within the Peninsula. The genetic characterization of both populations was performed through the analysis of X-chromosomal markers: X-STRs and X-indels.

Results and conclusion: The results showed that Miranda do Douro tended to present slightly lower levels of diversity in comparison to the other studied regions, which can be a discreet sign of isolation of that population over the years that might have led the way to the preservation of a language not spoken anywhere else in the country. The analysis of X-STRs particularly brought to light the presence of a subtle population sub-structure at the micro-geographical area encompassing the north-eastern border, which seems to portray the importance of the political border as a mechanism withholding gene flow between the two countries.