Significance of cell immunoreactions and cell apoptosis in oral lichen planus / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To evaluate the expression of CD4+, CD8+ T cells and cell apoptosis in oral lichen planus (OLP) and investigate the role and the relationship of immunological reaction and cell apoptosis in the pathogenesis of OLP2.</p><p><b>METHODS</b>Immunohistochemical technique was used to study the expression of CD4+, CD8+ T cells in 27 OLP cases. TUNEL was used for detecting the cell apoptotic index (AI) in 17 OLP2 cases.</p><p><b>RESULTS</b>The expression of CD4+, CD8+ T cells were obviously elevated in lamina propria of OLP group compared with control group (P<0.05). There was a strong significance when compared the ration of CD4/CD8 in both group. AI was remarkably increased in epithelia cells and significantly decreased in lymphocytes in lamina propria in OLP cases compared with its expression in the control group respectively.</p><p><b>CONCLUSION</b>The increased amount of CD4+, CD8+ T cells in lamina propria of OLP and the change ration of CD4/CD8 suggest that immune response is involved in the pathogenesis of OLP. The abnormal cell apoptosis plays an important role in the pathogenesis of OLP.</p>

Expression of survivin, Bcl-2 and p53 during 4-nitro-quinoline 1-oxide-induced rat tongue carcinogenesis / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To investigate the expression of survivin during oral carcinogenesis and its relationship with the expression of Bcl-2 and p53.</p><p><b>METHODS</b>Two-step immunohistochemical method was employed to detect the expression of survivin, Bcl-2 and p53 in 60 rat tongue carcinogenesis specimens induced by 4-nitro-quinoline 1-oxide (4NQO).</p><p><b>RESULTS</b>Survivin was present in 1/36 cases of normal mucosa, 6/11 cases of oral epithelial dysplasia and 10/11 cases of oral carcinoma. There were significant difference in the expression of survivin among normal mucosa, oral epithelial dysplasia and carcinoma (P < 0.001). While in the 17 cases of positive expression of survivin, Bcl-2 was present in 12 cases and p53 was present in 8 cases. The expression of survivin in oral epithelial dysplasia and carcinoma were significantly higher than that in normal oral mucosa (P < 0.01). The expression of survivin was positively correlated to the expression of Bcl-2 and p53 in rat tongue (P < 0.01).</p><p><b>CONCLUSIONS</b>The expression of survivin may play an important role in oral carcinogenesis. Survivin, Bcl-2 and p53 may be synergetic in the carcinogenesis of oral cancer.</p>

Expression of TGF-beta1, Smad7 and cell apoptosis in epithelium of oral lichen planus / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To examine the expression of TGF-beta1, Smad7 and cell apoptosis in oral lichen planus (OLP) and to evaluate the possible pathogenesis of oral lichen planus.</p><p><b>METHODS</b>Immunohistochemical technique was used to study the expression of TGF-beta1 and Smad7 in the epithelia cells of 17 OLP cases and 7 normal oral mucosa (NOM). TUNEL was used for detecting the cell apoptosis in 17 OLP cases and 7 NOM.</p><p><b>RESULTS</b>TGF-beta1 was moderately positive in the epithelia cells of OLP. All the epithelia cells in OLP showed strong cytoplasmic staining. The expression of TGF-beta1 and Smad7 were significantly increased in OLP compared with that in NOM (P < 0.05). Cell apoptotic index (AI) was remarkably increased in epithelia cells in OLP cases, and the cell apoptosis was localized in basal and suprabasal epithelial layers. There was a positive correlation between TGF-beta1 expression and cell apoptosis in the epithelia of OLP (r = 0.69, P <0.05).</p><p><b>CONCLUSIONS</b>High expression of TGF-beta1 and Smad7 in the epithelia of OLP suggests that TGF-beta1-Smad7 signal pathway was disturbed in oral lichen planus. The imbalance of TGF-beta1-Smad7 pathway may contribute to the mechanisms of cell apoptosis of epithelial cells in OLP.</p>