Role of interleukin-8 in the progression of estrogen receptor-negative breast cancer / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>Estrogen receptor (ER) is a very important biomarker of breast cancer. ER deletion has been consistently associated with tumor progression, recurrence, metastasis and poor prognosis, but the biological mechanism is still unclear. ER negative breast cancer expresses high levels of interleukin-8 (IL-8). ER expression can downregulate IL-8 promotor activity. As a multifunctional cytokine, IL-8 has many important biological activities in tumor genesis and development. With the goal of investigating the role of IL-8 in ER-negative breast cancer progression, we applied RNA interference technology to specifically knockdown the IL-8 expression in ER-negative breast cancer cell line MDA-MB-231.</p><p><b>METHODS</b>Interfering pRNA-IL-8 and the control was transfected into ER (-) MDA-MB-231. The proliferation, cell apotosis, and invasive ability were recorded in transfected, untransfected and negative transfected cells. These cells were injected into nude mice to assess tumorigenicity, proliferation, metastasis and microvessel density (MVD).</p><p><b>RESULTS</b>In vitro, decreased expression of IL-8 was associated with reduced cell invasion (P < 0.001), but had no effect on cell proliferation (P > 0.05). In vivo, neutrophils infiltration was significantly inhibited in pRNA-IL-8 transfected cells compared with untransfected and negatively transfected cells (P = 0.001, P < 0.001). Less metastasis was found in transfected cells compared with negatively transfected cells (0% vs 80%, P = 0.048). Nevertheless, we observed less MVD in transfected cells compared with control in nude mice (P < 0.001).</p><p><b>CONCLUSIONS</b>IL-8 inhibits ER-negative breast cancer cell growth and promotes its metastasis in vivo, which may be correlated with neutrophils infiltration induced by IL-8.</p>

Relationship between cytokine gene polymorphisms and acute rejection after renal transplantation / 中华器官移植杂志

Objective To investigate the cytokine genotypes of the renal transplantation recipients with or without acute rejections.Methods The cytokine genotypes of peripheral blood TNF ?, TGF ? IL 6 and IFN ? in 89 kidney to allograft receipients were detected by using PCR method. According to the test, the occurrence of acute rejection was compared among the groups. Results TNF ? and IFN ? high producer genotype (-308 GA and AA) showed a correlation with the high incidence of acute rejection to the HLA DR mismatching recipients. Conclusion To detect the cytokines gene polymorphisms before operations can find the high risk kidney receipients who may suffer from the acute rejection. It's very helpful in guiding the individual use of immunosuppressants following the renal transplantation.

Study on the expression of nuclear factor-?B in nephridial tissue and the protective role of irbesartan on diabetic nephropathy in rats / 中国医师杂志

Objective To investigate the prevention and cure effects of irbesartan on diabetic nephropathy.Methods The tissues of kidneys were harvested for histomorphometry and transmission electron microscope observation.The nuclear factor-?B(NF-?B) activity was measured by electrophoretic mobility shift assays(EMSA) in renal tissue and the level of TNF-? was measured by radio-immunity in serum.Results The glomerular basement membrane thickening,the numbers of total glomerular cells and monocyt cells in a glomerulus in experimental group were less than those of the control group.The NF-?B activity and TNF-? level were positively correlated with glomerular basement membrane thickening.Conclusion The irbesartan can prevent and cure diabetic nephropathy by inhibiting NF-?B and depressing inflammatory response.

Analysis for misassignments of HLA-B homozygotes by serology and detection for HLA-B expression variants / 中国免疫学杂志

Objective:To find the discrepancies caused by HLA B gene variants in HLA B antigen homozygotes which were typed again by DNA method.Methods:75 blood samples assigned HLA B homozygotes by serology were typed and detected HLA B expression variants by PCR SSP.Results:The 12 samples had been assigned the second alleles by DNA method in 75 HLA B homozygotes by serology.One out of 12 samples was identified expression variant by PCR SSP.The null allele was caused by the insertion of an extra cytosine at the beginning of exon 4.Conclusion:HLA B gene typing by PCR SSP will be the use of supplement to serology.The expression variant detection by PCR SSP will improve accuracy for tissue typing and benefit clinical application.