ABSTRACT
Cancer is a disease resulting from the disruption of cell cycle regulation, leading to the abnormal and unchecked proliferation of cells. Medicinal plants are rich in various bioactive phytochemicals or nutritional compounds. The aim is to determine the cytotoxic and genotoxic effects of ethanolic extracts of Macaranga peltata leaves on human oral cancer cell lines. The study setting was centre for Research on Molecular and Applied Sciences, Azeezia College of Dental Sciences and Research. The study design is a Comparative In Vitro study. Shade dried leaves of Macaranga peltata were subjected to Soxhlet extraction, and ethanolic extract was prepared. In vitro cytotoxic effects on human oral cancer cell lines were evaluated by (3-(4,5-dimethyl thiazole-2yl)-2,5-diphenyl tetrazolium bromide) MTT assay, and genotoxic effect was evaluated by comet assay. Untreated cell lines were used as control, and 5-fluorouracil was used as positive control. All experiments were performed in triplicates, and results were represented as Mean+/- SE. One-way ANOVA and Dunnet test were performed to analyze data. ***P < 0.001 compared with the control group. The ethanolic extract of Macaranga peltata exhibited cytotoxicity against oral cancer cells (LC50: 40.193089 µg/ml). There was a concentration-dependent increase in cell death, and at 100 µg/ml, the extract was most effective, causing 50% inhibition of viability. The comet assay showed significant genotoxic effects compared with 5-fluorouracil and untreated oral cancer cell lines. The ethanolic extract of Macaranga peltata leaves was subjected to MTT assay and comet using KB cell lines. The study concludes that the extract gave promising result for the anticancer activity on the KB cell lines producing cytotoxicity and genotoxicity.
ABSTRACT
Cancer stem cells (CSCs) are cancer cells that possess characteristics associated with normal stem cells, specifically the ability to give rise to all cell types found in a particular cancer sample. CSCs may generate tumors through the processes of self-renewal and differentiation into multiple cell types. CSCs present in tumors are normally resistant to conventional therapy and may contribute to tumor recurrence. Tumor residuals present after therapy, with CSCs enrichment, have all the hallmarks of epithelial-mesenchymal transition (EMT). In this review, we discuss the relationship between EMT and CSCs in cancer progression and its therapeutic implications in oral squamous cell carcinoma.
ABSTRACT
BACKGROUND: Barr body is formed from random inactivation and condensation of one of the two female chromosomes in virtually all the somatic cells of female mammals. Buccal smears have been reported to be potential sources of Barr bodies. AIM: This study was done to assess the efficacy of acriflavine (AF) Schiff and Papanicolaou (PAP) stains in sex determination by identifying Barr bodies in buccal smears of both sexes. MATERIALS AND METHODS: Two samples of buccal smears, collected from thirty males and thirty females in the age group of 16-60 years were used to demonstrate Barr bodies using AF Schiff and PAP stains, respectively. Hundred cells were examined for Barr body positive nucleus, and its mean percentage was calculated and statistically analyzed. RESULTS: In females, AF Schiff stained positive cells ranged from 16% to 53% and PAP stained positive cells ranged from 9% to 38%. In males, 0-9% AF positive Barr bodies and 0-5% PAP stained Barr bodies were identified. CONCLUSION: Sex determination using buccal smear is a simple and reliable method. AF Schiff stain is better both qualitatively and quantitatively when compared to PAP stain, thus aids in more accurate sex determination.
ABSTRACT
Internal resorption, a rare phenomenon, has been a quandary from the standpoints of both its diagnosis and treatment. It is usually asymptomatic and discovered by chance on routine radiographic examinations or by a classic clinical sign, "pink spot" in the crown. This paper emphasizes the etiology and pathophysiologic mechanisms involved in internal root resorption. Prognosis is good for smaller lesions; however, for those with extensive resorption associated with perforation the tooth structure is greatly weakened and the prognosis remains poor.
ABSTRACT
PURPOSE: Telomerase is a specialized ribonucleoprotein complex that stabilizes telomeres by adding "TAG" repeats to the end of chromosomes. The catalytic subunit of telomerase is human telomerase reverse transcriptase (hTERT), whose expression is the critical determinant of telomerase activity. Telomeres and telomerases play an important role in the longevity of cell and are known to conform "immortalization" on neoplastic cells. Although there exists a lot of information on telomerase in oral cancer, very little is known about their expression in leukoplakia and oral submucous fibrosis (OSF). This study addresses this lacuna. MATERIALS AND METHODS: In this preliminary study, immunohistochemistry (IHC) was used to detect the expression of hTERT protein in oral squamous cell carcinoma (OSCC) (n=30), leukoplakia (n=15), OSF (n=15) and normal oral mucosa (n=10). The cellular localization of immunostain, intensity of stain, mean nuclear labeling index (LI) and mean nuclear labeling score (LS) of hTERT protein were studied. A total number of 1000 cells were counted in each slide. All the data were analyzed using SPSS software version 10.0.2. The cellular localization of cytoplasmic/nuclear/both of hTERT stain, staining intensity and LI were compared across the groups using Pearson's χ2 test. The mean LI and LS for OSF, leukoplakia, OSCC and normal were compared using analysis of variance (ANOVA). A P-value <0.05 was considered to be statistically significant. RESULTS: The mean nuclear LI increased from OSF (22.46±4.53), through normal (28.3±12.3) to OSCC (47.56±21.30) (P=0.002) and from normal (28.3±12.3), through leukoplakia (44.06±14.6), to OSCC (47.56±21.30) (P=0.00). The mean nuclear labeling score was observed to increase from OSF (37.8±15), through normal (64.9±30.7), to OSCC samples (106.9±29.77) (P=0.00) and from normal (64.9±30.7), through leukoplakia (85.6±25.1) to OSCC samples (106.9±29.77) (P=0.00). CONCLUSION: There was increased expression of hTERT protein in OSCC and leukoplakia samples when compared to normal oral mucosa. The cellular localization, LI and LS in OSF were significantly different from OSCC and leukoplakia.
