Objective: To observe the effects of dietary zinc deficiency on the apoptosis of immunocytes in 3 weeks old rats and study the underlying mechanism. Methods: A zinc-deficient growing rat model was developed. Using TUNEL(terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling) method, the apoptosis of thymocytes and spleen lymphocytes was checked. The expression of bcl-2, bax mRNA in thymus and spleen was detected by RT-PCR. Results: Compared with zinc adequate(ZA) and paired-fed(PF) groups, the percentage of apoptosis cells in thymus and spleen of zinc-deficient(ZD) rats was obviously higher, and the thymus and spleen of ZD rats had a higher expression of bax mRNA. Zinc supplementation could reverse these changes. Conclusion: Dietary zinc deficiency leads to the increase of apoptosis of lymphocytes in thymus and spleen. One important mechanism is that the thymus and spleen have higher expression of bax mRNA, which causes the decrease of bcl-2/bax ratio.

AIM: To assess the relationship between ureaplasma urealyticum (UU) infection, vertical transmission pathway and diseases in neonates.METHODS: Specimens of amniotic fluid and cervical swabs from 30 women at delivery, and nasopharynx and urinary mouth secretions from 161 neonates were cultured for UU. RESULTS: The UU positive rate of 30 women at delivery and 8 neonates from puerperas with UU infection were 26.67% and 62.7%, respectively. The detective rate of UU in normal neonates (26 of 130, 20%) was significantly lower than that in sick neonates (14 of 31, 46%) ( P

Objective To study the features and its effect factors of T lymphocyte apoptosis in preterm neonates. Methods The susceptibility to apoptosis of T lymphocytes were determined in 30 full-term neonates and 19 preterm neonates by percentage calculation of apoptosis cell and DNA fragmentation analysis. The expression of CD 25 and CD 38 in peripheral blood mononuclear cells and the volume of IL-2 and IL-6 produced by lymphocytes incubated for 48 h was determined by immunofluorescence procedure and ELISA. Results T lymphocyte apoptosis was easier in preterm(27.2?2.7)%,(34.8?3.9)% than in full-term neonates(21.1?1.4)%,(27.9?2.3)% at incubating 24 h, 48 h(t=10.547,7.789;P

AIM: To assess the effect of indomethacin on tumor invasion in a human laryngeal cancer Hep-2 cell line in vitro. METHODS: Hep-2 cells were exposed to indomethacin at different concentrations for 48 h. Then cell growth rate, the colony formation in soft agar medium and cell mobility were examined, and monolayer invasion assay was performed to assess cell invasion index. RESULTS: Preteatment with indomethacin inhibited the colony formation of Hep-2 cells and the cell mobility, and decreased the invasion index. CONCLUSION: Indomethacin can inhibit the invasion of Hep-2 cells.

AIM: To evaluate the significance of cytokeratin19 (CK19) expression in diagnosing micrometastases in lymph nodes in patients with laryngeal carcinoma. METHODS: Forty cases of laryngeal carcinoma together with 163 lymph nodes were studied by the staining with hematoxylin and eosin(HE)and immunostaining with antibody against cytokeratin 19 (CK19) on histological sections of the primary tumor and regional lymph nodes. RESULTS: In all cases, CK19 was positively expressed in the primary tumor. Among 163 lymph nodes, metastases were confirmed by HE in 23 lymph nodes, and in 42 lymph nodes staining with immunohistochemistry, micrometastases were found in 19 lymph nodes. Micrometastases in the lymphonodes were significantly related to the T staging. CONCLUSION: Immunohistochemical staining is a valuable method for the detection of node micrometastases in patients with laryngeal carcinoma.

Objective: To observe the effects of zinc deficiency on peripheral blood lymphocyte phenotypic distribution and the balance between Th1 and Th2 cells in growing rats. Methods: Two-color cytofluorometric analysis was used. Results: Compared with zinc adequate (ZA) and paired-fed (PF) groups, peripheral blood lymphocytes in zinc deficient (ZD) rats had higher percentage of CD8+ cells (cytolytic T cells), lower percentage of CD4+ cells (T helper cells) and lower percentage of CD45RA+ cells (pure B lymphocytes).In addition, zinc deficiency selectively caused reduction of Th1-like CD45RC+CD4+ cells , but Th2-like CD45RC-CD4+cells had no significant changes in weanling rats. Zinc supplementation could reverse these changes. Conclusion: Dietary zinc deficiency leads to changes of lymphocyte phenotypic distribution and the imbalance of Th1 and Th2 subsets. These changes are reversible.

Objective To establish a pancreatic cancer model in Sprague Dawley(SD) rats,and to study the distribution and the counts of myofibroblast(MF) in pancreatic cancer and non-cancerous pancreatic tissues.MethodsDirectly implanted DMBA into pancreas parenchyma of SD rats and established TSA intervening group and control group. The carcinogenesis of rats executed within 3～5 months were inspected by HE stain and microscopy for pathomorphological changes.Myofibroblast(MF) was stained by Heidenains method. Results (1)The prevalence of pancreatic cancer in experimental group was 48.7%(18/37), including 17 pancreatic ductal adenocarcinoma and 1 fibrosarcoma. The prevalence of pancreatic cancer in intervering group was 33.3%(12/36), including 11 pancreatic ductal adenocarcinoma and 1 fibrosarcoma. The maximal diameters of tumor mass of experimental group was higher than that of intervering group (P

AIM: To study the expression of vascular endothelial growth factor (VEGF) in inflammatory mucosa of lacrimal sac. METHODS: Immunohistochemical S-P method was used to examine the expression of VEGF in the mocusa from 12 patients with chronic dacryocystitis and 8 volunteers. RESULTS: The positive rates of VEGF expression in different parts of the mocusa were: basal lamina: 44.3%+7.6%; surface epithelium: 16.9%?4.6%; connective tissue: 15.2%?4.9%, all normal mocusa of 8 cases were negative. There was a significant difference between the two groups (P

OBJECTIVE To investigate the rela-tionship between the expression of the proto-oncogene cerbB-2 proteins p185, level of adhesion molecules CD44v6, and lymphoid metastasis of laryngeal squa-mous cell carcinomas (LSCC). METHODS The expres-sion of p185 and CD44v6 in 63 specimen of LSCC tissues were examined by immunohistochemical method. RESULTS There was a significant difference in the expression of p185 between patient groups with and without lymphoid metastasis(P

Objective:In order to ascertain the lateral operation and medial maxillectomy affect on nasal airway.Method:Report 16 cases of nasal cavity or nasal sinus neoplasm who were therapied by lateral rhinotomy and medial maxillectomy.They were observed by acoustic rhinometer (AR) and CT examination in 1～2.5 years after the surgery. Result:The feeling of nasal obstruct were disappeared in 3 months after the surgery. The nasal airway resistance(NAR) of the ill nasal cavity was markedly decreased after the surgery, and the total NAR were decreasing unmarkably. The mucous proliferation was notable only in the first year after surgery, and especially on remains of the inferior turbinate or extra wall of nasal cavity.Conclusion:Lateral rhinotomy operation and medial maxillectomy have less impact on nasal airway and the functions.