γδT Cells Are Essential for Orthodontic Tooth Movement.

Sustained mechanical forces applied to tissue are known to shape local immunity. In the oral mucosa, mechanical stress, either naturally induced by masticatory forces or externally via mechanical loading during orthodontic tooth movement (OTM), is translated, in part, by T cells to alveolar bone resorption. Nevertheless, despite being considered critical for OTM, depletion of CD4+ and CD8+ T cells is reported to have no impact on tooth movement, thus questioning the function of αßT cells in OTM-associated bone resorption. To further address the role of T cells in OTM, we first characterized the leukocytes residing in the periodontal ligament (PDL), the tissue of interest during OTM, and compared it to the neighboring gingiva. Unlike the gingiva, monocytes and neutrophils represent the major leukocytes of the PDL. These myeloid cells were also the main leukocytes in the PDL of germ-free mice, although at lower levels than SPF mice. T lymphocytes were more enriched in the gingiva than the PDL, yet in both tissues, the relative fraction of the γδT cells was higher than the αß T cells. We thus sought to examine the role of γδT cells in OTM. γδT cells residing in the PDL were mainly Vγ6+ and produced interleukin (IL)-17A but not interferon-γ. Using Tcrd-GDL mice allowing conditional ablation of γδT cells in vivo, we demonstrate that OTM was greatly diminished in the absence of γδT cells. Further analysis revealed that ablation of γδT cells decreased early IL-17A expression, monocyte and neutrophil recruitment, and the expression of the osteoclastogenic molecule receptor activator of nuclear factor-κß ligand. This, eventually, resulted in reduced numbers of osteoclasts in the pressure site during OTM. Collectively, our data suggest that γδT cells are essential in OTM for translating orthodontic mechanical forces to bone resorption, required for relocating the tooth in the alveolar bone.

Niche Specific Microbiota-Dependent and Independent Bone Loss around Dental Implants and Teeth.

Oral mucosal homeostasis is achieved by complex immunologic mechanisms, orchestrating host immunity to adapt to the physiologic functions of the various specialized niches in the oral cavity. Dental implants introduce a novel mucosal niche to the immune system to deal with. Nevertheless, the immune mechanisms engaged toward implants and whether they have broader effects are not well defined. Using a murine model, we found an accumulation of neutrophils and RANKL-expressing T and B lymphocytes in the implant-surrounding mucosa, accompanied by local bone loss. Surprisingly, the presence of implants had an impact on remote periodontal sites, as elevated inflammation and accelerated bone loss were detected in intact distant teeth. This was due to microbial dysbiosis induced by the implants, since antibiotic treatment prevented bone loss around teeth. However, antibiotic treatment failed to prevent the loss of implant-supporting bone, highlighting the distinct mechanisms mediating bone loss at each site. Further analysis revealed that implants induced chronic lymphocyte activation and increased mRNA expression of IFN-α and accumulation of IFN-α-producing plasmacytoid dendritic cells, which we previously reported as bone-destructive immune responses. Collectively, this study demonstrates that implants have a strong and broad impact on oral mucosal homeostasis, inducing periodontal bone loss in a niche-specific manner that is both microbiota dependent and independent.

[Diagnostics of the changes arising in an oral cavity at oncological sick senior age groups (review)].

Article is devoted to the changes happening in an oral cavity and in oral liquid under the influence of preparations of the oncological diseases used for treatment. Considering that research of oral liquid belongs to one of noninvasive methods of diagnostics and can be used with success for definition and correction of conditions of the mucous membrane of an oral cavity at the patients of advanced and senile age passing polychemotherapeutic treatment, this type of research is the extremely perspective for a gerontostomatology.

An increase in reported cases of haemorrhagic fever with renal syndrome in Slovenia in early 2008.

Haemorrhagic fever with renal syndrome (HFRS) is an acute zoonotic viral disease, caused by hantaviruses. Hantaviruses infect rodents worldwide. They are transmitted to humans by aerosol from rodent excreta. Several hantaviruses are known to infect humans with varying severity.

American medical students in Israel: stress and coping--a follow-up study.

BACKGROUND: Medical students studying abroad face the double stress of adjusting to a new cultural environment while at the same time, coping with the usual stresses of medical school. In a previous article, we examined the perceived stress and coping of American medical students studying in Israel. AIMS: The current study was designed to follow up changes in made in response to the original study. PARTICIPANTS: First year students, NY/American Program, Sackler School of Medicine, Tel Aviv University, Israel. METHODS: Ways of Coping Checklist (WCCL), Appraisal Dimension Scale (ADS) and two instruments specifically designed for the study. RESULTS: Students' coping with their adjustment to Israel was highly correlated to their adjustment to medical school. There was significant improvement in student mental health and student satisfaction and a corresponding reduction in dysfunctional defence mechanism and a previous pattern of heavy drinking. DISCUSSION: The results are discussed in terms of improvements in the student support system proposed at the time of the initial study as well as changes in the student body. Limitations and future directions for research are also discussed.

The role of a secondary pediatric ambulatory care service within the community.

OBJECTIVE: To describe the establishment and function of a secondary pediatric ambulatory care service within the community, to assess the utilization of a pediatric community service ("The Center"), and to assess parents' degree of satisfaction with the quality of care in the center. DESIGN: Personal information and information regarding all visits was recorded and analyzed. A structured telephone interview was used to evaluate parents' satisfaction with the quality of care in the center. SETTING: A pediatric community centre managed by board certified pediatricians. The clinic offers primary and secondary care. PARTICIPANTS: A random sampling of parents of children who visited the center (n = 615). RESULTS: The number of children treated in the center increased five-fold within three years. Most visits took place during evening hours and over the weekends. The most common presenting symptoms were fever, respiratory and gastrointestinal complaints, earache, and trauma. Eighty-nine percent of parents were satisfied or very satisfied with the quality of care in the center; 95% were satisfied or very satisfied with the attitudes of physicians and nurses providing treatment. CONCLUSION: The center is widely utilized by parents with a great degree of satisfaction. The availability and extended working hours of the center provided medical care for a large number of children seeking "after hours" medical attention, as well as a backup for the primary care physicians. The center, therefore, provides a model for improved quality of medical care within the community.