Effect of periostin in peri-implant sulcular fluid and gingival crevicular fluid: A comparative study.

Background: Various similarities have been observed between gingival crevicular fluid (GCF) and peri-implant sulcular fluid (PISF). This has resulted in research that has evaluated similar biological fluid markers that are similar to those present within the gingival sulcus. These biomarkers have high sensitivity and are a reliable biological tool when compared to clinical and/or radiographic examination and aid in diagnosis as well as monitoring the progression of periodontal disease surrounding teeth as well as the implants. Aim: The study aimed to compare the effectiveness of periostin in peri-implant sulcular and gingival crevicular fluids. Materials and Methods: This experimental prospective in vitro analysis was done following clearance by the institutional ethical committee. A total of 100 patients were selected. They were categorized into two groups: (I) Group A patients had peri-implant disease (n = 50), whereas (II) Group B patients had periodontitis (n = 50). Clinical loss of attachment score was noted in six sites around natural teeth and four sites around the implants. Presterilized filter paper strips were inserted within the sulcus/pocket till pressure was felt for 60 s. Periostin concentration levels in GCF and PISF samples were measured by the enzyme-linked immunosorbent assay technique. Statistical analysis of data collected was performed using Shapiro-Wilk statistical tool for normally distributed numerical data. . Results: Mean ± standard deviation concentration of periostin in gingival crevicular fluid from periodontitis cases was recorded as 20.15 ± 2.76 ng/30sn, whereas in PISF was 19.23 ± 1.89 ng/30sn. On statistical analysis, no statistically significant differences were seen after comparing the concentration of periostin in periodontitis as well as peri-implantitis groups (P > 0.05). Conclusion: The present study analyzed periostin levels in gingival crevicular fluid obtained from patients diagnosed with periodontitis and sulcular fluid obtained from the sulcus around implants. Early biological markers or indicators of inflammation should be studied to determine the prognosis of treatment apart from the clinical assessment for the patient's benefit.

Résumé Contexte: Diverses similitudes ont été observées entre le fluide sulculaire gingival (GCF) et le fluide sulculaire péri-implantaire (PISF). Ce a abouti à des recherches qui ont évalué des marqueurs fluides biologiques similaires à ceux présents dans le sillon gingival. Ces les biomarqueurs ont une sensibilité élevée et sont un outil biologique fiable par rapport à l'examen clinique et/ou radiographique et aident à diagnostic ainsi que le suivi de la progression de la maladie parodontale entourant les dents ainsi que les implants. Objectif: L'étude visait à comparent l'efficacité de la périostine dans les fluides péri-implantaires sulculaires et gingivaux. Matériels et Méthodes: Ce test expérimental une analyse prospective in vitro a été effectuée après autorisation par le comité d'éthique de l'établissement. Au total, 100 patients ont été sélectionnés. Ils étaient classés en deux groupes: (I) les patients du groupe A avaient une maladie péri-implantaire (n = 50), alors que (II) les patients du groupe B avaient une parodontite (n = 50). Le score clinique de perte d'attache a été noté dans six sites autour des dents naturelles et quatre sites autour des implants. Bandes de papier filtre préstérilisées ont été insérés dans le sulcus/poche jusqu'à ce que la pression soit ressentie pendant 60 s. Les niveaux de concentration de périostine dans les échantillons GCF et PISF ont été mesurés par la technique de dosage immuno-enzymatique. L'analyse statistique des données recueillies a été effectuée à l'aide de la méthode statistique de Shapiro-Wilk. outil pour les données numériques distribuées normalement. Résultats: concentration moyenne ± écart-type de périostine dans le liquide gingival les cas de parodontite ont été enregistrés à 20,15 ± 2,76 ng/30sn, alors que dans le PISF, ils étaient de 19,23 ± 1,89 ng/30sn. Sur l'analyse statistique, pas statistiquement des différences significatives ont été observées après avoir comparé la concentration de périostine dans les groupes parodontite et péri-implantite (P > 0,05). Conclusion: La présente étude a analysé les niveaux de périostine dans le liquide créviculaire gingival obtenu chez des patients diagnostiqués avec une parodontite et fluide sulculaire obtenu à partir du sulcus autour des implants. Les marqueurs ou indicateurs biologiques précoces de l'inflammation doivent être étudiés pour déterminer le pronostic du traitement en dehors de l'évaluation clinique au bénéfice du patient. Mots-clés: Créviculaire, liquide, gingival, péri-implantaire, parodontite, périostine, pronostic, sulculaire.

Prevention of carcinogen-induced oral cancers by polymeric black tea polyphenols via modulation of EGFR-Akt-mTOR pathway.

The overexpression of Epidermal Growth Factor Receptor (EGFR) and dysregulation of its downstream effector pathways are important molecular hallmarks of oral cancers. Present study investigates the chemopreventive potential of polymeric black tea polyphenols (PBPs)/thearubigins (TRs) in the hamster model of oral carcinogenesis as well as determine the effect of PBPs on EGFR and the molecular players in the EGFR pathway. In dose-dependent manner, pre and concurrent treatment with PBPs (1.5%, 5%, 10%) decreased the number and volume of macroscopic tumors as well as the number and area of microscopic lesions. Interestingly, at 10% dose of PBPs, no macroscopic or microscopic tumors were observed. We observed PBPs mediated dose-dependent decrease in oxidative DNA damage (8OHdG); inflammation (COX-2); proliferation (PCNA, Cyclin D1); expression of EGFR, and its downstream signaling kinases (pAkt, Akt, and mTOR); hypoxia (HIF1α) and angiogenesis (VEGF). There was also a PBPs mediated dose-dependent increase in apoptosis (Bax). Thus, our data clearly indicate that the observed chemopreventive potential of PBPs was due to modulation in the EGFR pathway associated with cell proliferation, hypoxia, and angiogenesis. Taken together, our results demonstrate preclinical chemopreventive efficacy of PBPs and give an insight into its mechanistic role in the chemoprevention of experimental oral cancer.

Lipid-polymer hybrid nanocarriers for delivering cancer therapeutics.

Cancer remained a major cause of death providing diversified challenges in terms of treatment including non-specific toxicity, chemoresistance and relapse. Nanotechnology- based delivery systems grabbed tremendous attention for delivering cancer therapeutics as they provide benefits including controlled drug release, improved biological half-life, reduced toxicity and targeted delivery. Majority of the nanocarriers consists of either a polymer or a lipid component along with other excipients to stabilize the colloidal system. Lipid-based systems provide advantages like better entrapment efficiency, scalability and low- cost raw materials, however, suffer from limitations including instability, a burst release of the drug, and limited surface functionalization. On the other hand, polymeric systems provide an excellent diversity of chemical modifications, stability, controlled release, however limited drug loading capacities and scale up limit their use. Hybrid nanocarriers consisting of lipid and polymer were able to overcome some of these disadvantages while retaining the advantages of both the systems. Designing a stable lipid-polymer hybrid system requires a thorough understanding of the material properties and their behavior in in vitro and in vivo environments. This review highlights the current status and future prospects of lipid-polymer hybrid systems with a particular focus on cancer nanotherapeutics.