Mouthguard Use and Awareness of Junior Rugby League Players in the Gold Coast, Australia: A Need for More Education.

OBJECTIVE: To investigate knowledge, attitude, and awareness of appropriate mouthguard use, as well as the management of traumatic dental injuries (TDIs). DESIGN: Cross-sectional survey. SETTING: Community survey. PARTICIPANTS: Four hundred ninety-four junior rugby league players and their coaches in the Gold Coast, Australia. INTERVENTIONS: Data were collected anonymously during training sessions by means of a survey questionnaire, followed by a presentation on mouthguards and the management of TDIs. MAIN OUTCOME MEASURES: Descriptive statistics on the frequency distribution of the demographic characteristics, knowledge, and use of mouthguards as well as the relationships between the type of mouthguard worn and questions related to mouthguard use. RESULTS: The majority of players surveyed reported wearing a mouthguard (68.2%). Cost (40.1%) and not believing that they work (35.7%) were listed as the main reasons for not doing so. The boil-and-bite type was the most used by players (64.7%). Almost 44% of coaches and 50% of players responded that only a dentist can manage an avulsed tooth, that a tooth had to be reinserted within 15 minutes (40.6% and 21.9%, respectively), and that either water or milk can be used to transport an avulsed tooth to the dentist (100% and 82.2%, respectively). CONCLUSIONS: Education related to the correct use of mouthguards and the management of TDIs should be ongoing for players, their caregivers, and their coaches and should be required as part of the training of coaches to prevent injury in rugby league. CLINICAL RELEVANCE: This study found that although the overwhelming majority of junior rugby league coaches encourage the wearing of mouthguards, only two-thirds of the players do so. Players' compliance to wear mouthguards is largely influenced by their perception of efficacy and its comfort. Educational campaigns with involvement of dental practitioners, related to the correct use of mouthguards and the management of TDIs, should be ongoing for players, their caregivers, and their coaches and should also be required as part of the training of coaches.

Keratinization-associated miR-7 and miR-21 regulate tumor suppressor reversion-inducing cysteine-rich protein with kazal motifs (RECK) in oral cancer.

MicroRNAs (miRNAs) are small non-coding RNAs that posttranscriptionally regulate gene expression during many biological processes. Recently, the aberrant expressions of miRNAs have become a major focus in cancer research. The purpose of this study was to identify deregulated miRNAs in oral cancer and further focus on specific miRNAs that were related to patient survival. Here, we report that miRNA expression profiling provided more precise information when oral squamous cell carcinomas were subcategorized on the basis of clinicopathological parameters (tumor primary site, histological subtype, tumor stage, and HPV16 status). An innovative radar chart analysis method was developed to depict subcategories of cancers taking into consideration the expression patterns of multiple miRNAs combined with the clinicopathological parameters. Keratinization of tumors and the high expression of miR-21 were the major factors related to the poor prognosis of patients. Interestingly, a majority of the keratinized tumors expressed high levels of miR-21. Further investigations demonstrated the regulation of the tumor suppressor gene reversion-inducing cysteine-rich protein with kazal motifs (RECK) by two keratinization-associated miRNAs, miR-7 and miR-21. Transfection of miR-7 and miR-21-mimics reduced the expression of RECK through direct miRNA-mediated regulation, and these miRNAs were inversely correlated with RECK in CAL 27 orthotopic xenograft tumors. Furthermore, a similar inverse correlation was demonstrated in CAL 27 cells treated in vitro by different external stimuli such as trypsinization, cell density, and serum concentration. Taken together, our data show that keratinization is associated with poor prognosis of oral cancer patients and keratinization-associated miRNAs mediate deregulation of RECK which may contribute to the aggressiveness of tumors.

The genome of deep-sea vent chemolithoautotroph Thiomicrospira crunogena XCL-2.

Presented here is the complete genome sequence of Thiomicrospira crunogena XCL-2, representative of ubiquitous chemolithoautotrophic sulfur-oxidizing bacteria isolated from deep-sea hydrothermal vents. This gammaproteobacterium has a single chromosome (2,427,734 base pairs), and its genome illustrates many of the adaptations that have enabled it to thrive at vents globally. It has 14 methyl-accepting chemotaxis protein genes, including four that may assist in positioning it in the redoxcline. A relative abundance of coding sequences (CDSs) encoding regulatory proteins likely control the expression of genes encoding carboxysomes, multiple dissolved inorganic nitrogen and phosphate transporters, as well as a phosphonate operon, which provide this species with a variety of options for acquiring these substrates from the environment. Thiom. crunogena XCL-2 is unusual among obligate sulfur-oxidizing bacteria in relying on the Sox system for the oxidation of reduced sulfur compounds. The genome has characteristics consistent with an obligately chemolithoautotrophic lifestyle, including few transporters predicted to have organic allocrits, and Calvin-Benson-Bassham cycle CDSs scattered throughout the genome.