No abstract available.
DNA Nucleotidylexotransferase*

OBJECTIVE: The study aimed to evaluate the feasibility and reproducibility of measuring phospholipase C zeta (PLCzeta) using immunostaining in human sperm and to investigate the relationship between PLCzeta immunoreactivity and DNA fragmentation and oxidation in human sperm. METHODS: Semen samples were obtained from participants (n=44) and processed by the conventional swim-up method. Sperm concentration, motility, normal form by strict morphology, DNA fragmentation index assessed by terminal deoxynucleotidyl transferase dUTP nick end labeling method and immunofluorescent expression for 8-hydroxy-2'-deoxyguanosine (8-OHdG) and PLCzeta were assessed. RESULTS: When duplicate PLCzeta tests were performed on two sperm samples from each of the 44 participants, similar results were obtained (74.1+/-9.4% vs. 75.4+/-9.7%). Two measurements of PLCzeta were found to be highly correlated with each other (r=0.759, P<0.001). Immunoreactivity of PLCzeta was not associated with donor's age, sperm concentration, motility, and the percentage of normal form as well as DNA fragmentation index. However, immunoreactivity of PLCzeta showed a significant negative relationship with 8-OHdG immunoreactivity (r=-0.404, P=0.009). CONCLUSION: Measurement of PLCzeta by immunostaining is feasible and reproducible. Lower expression of PLCzeta in human sperm may be associated with higher sperm DNA oxidation status.
DNA ; DNA Fragmentation* ; DNA Nucleotidylexotransferase ; Humans ; Semen ; Spermatozoa* ; Type C Phospholipases*

Apoptosis, including the programmed cell death, is important event in normal cell turnover and maintenance of adult tissues. Apoptosis exerts a homeostatic function in relation to tissues dynamics, as the steady state of continuously renewing tissues achieved by a balance between cell replication and cell death. This study was undertaken to investigate the association between apoptosis and development of the cervical neoplasia. Archival cervical samples from normal epithelium (n 10), low-grade squamous intraepithelial lesions (LSIL, n = 10), high-grade squamous intraepithelial lesions (HSIL, n 10), microinvasive squamous cell carcinomas (n 10), and invasive squamous cell carcinomas (n = 10) were evaluated for apoptosis. We used in situ end-labeling of DNA strand breaks by terminal deoxynucleotidyltransferase incorporation of biotinylated deoxyuridine to 3-OH ends of DNA, identified by nickel-avidine-peroxidase. The apoptotic index (sum of apoptotic bodies divided by the total nuclei times 100) significantly decreased (P<0.05) as the degree of neoplasia increased: 3.1 + 0.9 % in normal epithelium, 5.5 +/- 1.4 % in LSIL, 1.6 +/- 0.4 % in HSIL, 1.9 +/- 0.5 % in microinvasive carcinomas, and 0.6 +/- 0.3 % in invasive carcinomas. Compared to normal epithelium, the total cell number per 200x field increased significantly (P<0,05): 379 +/- 47 in normal epithelium, 462 +/- 228 in LSIL, 670+/-293 in HSIL, 1035 +/- 254 in microinvasive carcinomas, and 1389 +/- 247 in invasive carcinomas. Consequently, these results suggest that progession of cervical carcinogenesis is associated with a decrease in apoptotic index and an increase in the number of the total cell.
Adult ; Apoptosis* ; Carcinogenesis ; Carcinoma, Squamous Cell ; Cell Count ; Cell Death ; Deoxyuridine ; DNA ; DNA Nucleotidylexotransferase ; Epithelium ; Humans

OBJECTIVE: This study was performed to evaluate the protective effects of selenium against the methyl mercury chloride (MeHgCl) induced cell apoptosis. METHODS: The effect of selenium on the MeHgCl induced cell apoptosis was observed in mouse macrophage-derived RAW 264.7 cells, in vitro. The cells were cultured in Dulbecco's modified Eagle's medium (DMEM). RESULTS: MeHgCl exerted a dose dependent cytotoxicity, as demonstrated by the MTT assay, an assay dependent, in part, on mitochondrial function. Concurrent exposure to selenium provided complete protective effects against the cytotoxicity induced by MeHgCl. Pretreatment with selenium increased the protective effects of subsquent administrations of selenium in conjunction with MeHgCl, but pretreatment of selenium alone did not provide protection against MeHgCl when given alone. Selenium administered after exposure to MeHgCl did not repair the existing MeHgCl induced cytotoxicity.Furthermore, the apoptosis induced by MeHgCl was revealed by the DNA fragmentation, using the terminal deoxynucleotidyl transferase Biotin-dUTP nick end labeling (TUNEL) assay, alterations to the nuclear morphology, by nuclei staining, and the plasma membrane lipid organization, as shown by cell flow cytometry. The apoptosis induced by MeHgCl was prevented by the concurrent exposure to selenium, or pretreatment with selenium, prior to the administration of selenium in conjunction with MeHgCl. However, no inhibittion of the MeHgCl induced apoptosis was observed with selenium pretreatment prior to exposure to MeHgCl alone, or with the administration of selenium after exposure to MeHgCl. CONCLUSIONS: These results suggest that the coexistence of selenium and MeHgCl are essential for the protective effects of selenium against the MeHgCl-induced apoptosis, and the cytotoxicity, in RAW 264.7 cells, and may involve selenium-MeHgCl binding.
Animals ; Apoptosis* ; Cell Membrane ; DNA Fragmentation ; DNA Nucleotidylexotransferase ; Flow Cytometry ; Mice ; Selenium*

PURPOSE: This study was to observe whether the apoptotic function of tumor-infiltrating lymphocytes (TIL) is induced in human gastric epithelial dysplasia and gastric adenocarcinoma according to the role of FasL expression. MATENRIALS AND METHODS: A total of 56 gastric epithelial dysplasia and gastric adenocarcinoma patients were enrolled in this study: 9 cases of gastric epithelial dysplasia, 18 cases of early gastric carcinomas (EGC) and 29 cases of advanced gastric carcinomas (AGC). Immunohistochemical staining was performed for FasL and CD45, and the terminal deoxynucleotidyl transferase mediated dUTP nick end labelling (TUNEL) method was used to detect cell death in tumor-infiltrating lymphocytes. RESULTS: 1) Positive reactions of FasL to neoplastic cells were 88.9% (8/9) in gastric epithelial dysplasia, 83.3% (15/18) in EGC, and 75.9% (22/29) in AGC. 2) Expression of TIL was decreased in the FasL positive region and was increased in the FasL negative region, and significant expression of TIL was observed in the AGC group (P=0.001). 3) Expression of apoptotic TIL was very similar to the FasL expression, and 100% expression was observed in gastric epithelial dysplasia group. 4) Expression of apoptotic TIL was increased in the FasL positive region and decreased in the FasL negative region, and significant apoptotic expression was observed in the gastric epithelial dysplasia and EGC groups (P=0.0420, P=0.0263, respectively). CONCLUSION: These results suggest that FasL is a prevalent mediator of immune privilege in epithelial dysplasia and cancer of the stomach.
Adenocarcinoma* ; Apoptosis* ; Cell Death ; DNA Nucleotidylexotransferase ; Humans ; Lymphocytes, Tumor-Infiltrating ; Stomach Neoplasms

The apoptotic effect of bacteria-derived beta-glucan was investigated in human colon cancer cells SNU-C4 using terminal deoxynucleotidyl transferase (TdT)-mediated dUTP nick end labeling (TUNEL) assay, reverse transcription-polymerase chain reaction (RT-PCR) expressions of Bcl-2, Bax, and Caspase-3 genes, and assay of caspase-3 enzyme activity. beta-Glucan of 10, 50, and 100 microg/mL decreased cell viability in a dose-dependent manner with typical apoptotic characteristics, such as morphological changes of chromatin condensation and apoptotic body formation from TUNEL assay. In addition, beta-glucan (100 microgram/mL) decreased the expression of Bcl-2 by 0.6 times, whereas the expression of Bax and Caspase-3 were increased by 3.1 and 2.3 times, respectively, compared to untreated control group. Furthermore, the caspase-3 activity in the beta-glucan-treated group was significantly increased compared to those in control group (P < 0.05). Bacterial derived beta-glucan could be used as an effective compound inducing apoptosis in human colon cancer.
Apoptosis ; Caspase 3 ; Cell Survival ; Chromatin ; Colon ; Colonic Neoplasms ; DNA Nucleotidylexotransferase ; Humans ; In Situ Nick-End Labeling

BACKGROUND: Survivin, a novel antiapoptotic gene has been linked with tumor development and progression in various human carcinomas including gastric carcinomas. The aim of this study was to evaluate the expression of survivin in gastric carcinoma and its correlation with tumor cell proliferation and apoptosis. METHODS: Expression of survivin was evaluated immunohistochemically in 84 surgically resected gastric carcinomas. Tumor cell apoptosis was evaluated with terminal deoxynucleotidyl transferase (TdT) mediated deoxyuridine triphosphate (dUTP) nick-end labeling (TUNEL), and Ki-67 immunostaining was used for evaluation of tumor cell proliferation. RESULTS: Expression of survivin was noted in 53.6% of the gastric carcinomas, and was significantly associated with depth of invasion, status of lymph node metastasis or tumor stage (p=0.022, 0.034, 0.040, respectively). There was an inverse correlation between survivin expression and apoptotic index (p=0.015). But there was no significant correlation between survivin expression and Ki-67 labeling index (p=0.430). CONCLUSIONS: These results suggest that survivin expression may contribute to tumor development and progression by inhibiting apoptosis in human gastric carcinoma.
Apoptosis ; Cell Proliferation ; Deoxyuracil Nucleotides ; Deoxyuridine ; DNA Nucleotidylexotransferase ; Humans ; Lymph Nodes ; Neoplasm Metastasis ; Stomach Neoplasms

BACKGROUND: Increasing evidences from experimental studies indicate that apoptosis may be inversely related to angiogenesis in tumor progression. MATERIAL AND METHOD: To explore how apoptosis correlates with tumor angiogenesis, we measured the apoptotic index(AI) using the terminal deoxynucleotidyl transferase method(Apop Tag In Situ Apoptosis Detection Kit, ONCOR) and the intratumoral microvessel density using the anti-CD31 monoclonal antibody in non-small cell lung cancer. RESULT: Statistical analysis revealed an inverse correlation between AIs and intratumoral microvessel densities in squamous cell lung carcinoma(Spearman rank correlation coefficient r=- 0.229, p=0.047). CONCLUSION: The results of this study demonstrated that the amount of apoptosis in squamous cell lung carcinoma may be influenced by the extent of neovascularization. This suggests that tumor angiogenesis may contribute to a reduction of apoptosis in tumor cells.
Apoptosis* ; Carcinoma, Non-Small-Cell Lung* ; DNA Nucleotidylexotransferase ; Lung ; Lung Neoplasms ; Microvessels*

BACKGROUND: Fixation of cells is a critical procedure that can determine the success of immunocytochemical staining (ICC) of cytospin slides. In this study, we evaluated the efficacy of a number of fixatives to determine the ideal fixative for ICC of cytospin slides. METHODS: Sixteen patients with metastatic neoplasm in the body cavity were enrolled. Cytospin slides were prepared from each patient using 5 different fixatives (cold acetone, 95% ethanol, 1:1 methanol:ethanol, 3.7% formalin, and 3:1 methanol:acetone), and the suitability of each for use with Wright's stain was compared. For 4 of the samples, appropriate ICCs were performed using all 5 fixatives and the results were compared, while for 11 samples, only the first 3 fixatives were used for ICC. RESULTS: Using Wright stain, cold acetone, 95% ethanol, and 1:1 methanol:ethanol fixatives all showed similar efficacy when compared to the conventional methanol fixation method. However, the stain quality using 3.7% formalin or 3:1 methanol:acetone fixatives was poor due to deterioration of cell adhesion and distortion of cell morphology. Using ICC, cold acetone fixative showed stronger and more tumor-specific stainability than the 95% ethanol (decreased stainability in 6 stained slides, false positive staining of histiocytes/neutrophils in 4 stained slides, no staining of CD3 and terminal deoxynucleotidyl transferase [TdT]) and 1:1 methanol:ethanol fixatives (decreased stainability in 3 stained slides, false positive staining of histiocytes/neutrophils in 2 stained slides, no staining of CD3 and TdT). CONCLUSIONS: Cold acetone fixative was the most efficacious among the 5 fixatives tested in this study; therefore, it is the most appropriate fixative in the preparation of cytospin slides for ICC.
Acetone ; Cell Adhesion ; Cold Temperature ; DNA Nucleotidylexotransferase ; Ethanol ; Fixatives ; Formaldehyde ; Humans ; Immunohistochemistry ; Methanol

OBJECTIVE: GnRH-agonist (GnRH-Ag) used in controlled ovarian hyperstimulation (COH) for IVF-ET has been known to affect directly on apoptosis of human ovarian cells, but its mechanism is not clearly understood. Therefore, the purpose of the present study was to investigate whether caspase-3 and -9 activation and poly-(ADP-ribose)-polymerase (PARP) cleavage are involved in the mechanism(s) by which GnRH-Ag induces apoptosis in human granulosa-luteal cells. METHODS: Human granulosa-luteal cells collected from IVF-ET patients were cultured and treated with 10(-6) M GnRH-Ag or saline as a control. To access apoptosis in the cells, terminal deoxynucleotidyl transferase (TdT)-mediated dUTP-digoxigenin nick end-labeling (TUNEL) assay and DNA fragmentation analysis were preformed 24 h after the treatment. Activity of caspase-3 and -9 in the cells was examined by using a fluorogenic substrate. Caspase-3 and -9 activation and poly (ADP-ribose) polymerase (PARP) cleavage were analyzed by Western blotting. RESULTS: DNA fragmentation in the cells increased in the higher concentration over 10(-6) M GnRH-Ag. In the result of TUNEL assay, the rate of apoptotic cells in GnRH-Ag treatment increased significantly compared with that of saline treatment (p<0.05). The activity of caspase-3 and -9 investigated by using a fluorogenic substrate increased only in the apoptotic cells. In Western blot analysis, the cells treated with GnRH-Ag revealed an increase in active forms of caspase-3 and -9 compared with those of the saline treatment. In addition, cleavage of PARP also increased in the cells treated with GnRH-Ag. CONCLUSION: These results suggest that activation of caspase-3 and -9 and cleavage of PARP might be involved in apoptosis of human granulosa-luteal cells induced by GnRH-Ag.
Apoptosis* ; Blotting, Western ; Caspase 3* ; DNA Fragmentation ; DNA Nucleotidylexotransferase ; Female ; Fluorescent Dyes ; Humans* ; In Situ Nick-End Labeling ; Luteal Cells*