Inhibition of hsa_circ_0003489 shifts balance from autophagy to apoptosis and sensitizes multiple myeloma cells to bortezomib via miR-874-3p/HDAC1 axis.

BACKGROUND: Circular RNAs (circRNAs) crucially regulate tumor progression. In this study, we examined the functional roles and mechanisms of hsa_circ_0003489 in multiple myeloma (MM). METHODS: Upon altering the expressions of hsa_circ_0003489, miR-874-3p, and/or histone deacetylase 1 (HDAC1) in MM1.R cells and treating them with bortezomib (BTZ), cell viability was examined by CCK-8 assay; cell proliferation by Ki-67 immunofluorescence; apoptosis by TUNEL staining, flow cytometry, and western blot; and autophagy by electron microscopy and western blot. The interaction between hsa_circ_0003489 and miR-874-3p as well as that between miR-874-3p and HDAC1 was examined by expressional analysis, dual luciferase reporter assay, and RNA immunoprecipitation. The in vivo impacts of hsa_circ_0003489 on MM growth and sensitivity to BTZ were examined using an MM xenograft mouse model. RESULTS: Knocking down hsa_circ_0003489 significantly inhibited the viability, cell proliferation, and autophagy, while promoting the apoptosis of MM cells in vitro and MM xenograft in vivo. Suppressing hsa_circ_0003489 also further boosted the cytotoxic effects of BTZ in MM cells and reversed its promoting effect on autophagy. Mechanically, hsa_circ_0003489 acted as a sponge of miR-874-3p and positively regulated the expression of miR-874-3p target, HDAC1. MiR-874-3p and HDAC1 essentially mediated the effects of hsa_circ_0003489 on cell viability, proliferation, apoptosis, and autophagy. CONCLUSION: The hsa_circ_0003489/miR-874-3p/HDAC1 axis critically regulates the balance between apoptosis and autophagy. Silencing hsa_circ_0003489 sensitizes MM cells to BTZ by inhibiting autophagy and thus may boost the therapeutic effects of BTZ.

[Dendritic Cells Promote the Proliferation of Peripheral Blood CRTH2 Cells (CD4(+)CD294(+)Th2) and Help B Cells to Secrete Immunoglobulin].

Objective：To investigate the promotive effect of dendritic cells(DCs) on proliferation of CRTH2 (CD4(+)CD294(+)Th2) cells and the influence of CRTH2 cells on secretion of immunoglobulin from B cells so as to provide a new approach for amplification and sorting of Th2 cells. Methods：DCs were induced from peripheral blood mononuclear cells, then the loaded-BCGV-Ag-DCs were cocultured with T cells, and the mixed lymphocyte reaction(MLR) was performed by CCK8 method. The phenotypes of DCs and CRTH2 cells were detected by flow cytometry. CRTH2 cells sorted by MACS were co-cultured with B cells for 5 days to detect the secretion of immunoglobulin. Results：The subsets and absolute number CRTH2 cells were significantly increased by loaded-BCGV-Ag-DCs. The levels of IgG, IgA and IgE were higher increased in supernatant of CRTH2 and B cell co-culture system than that in control group or that in transwell group(P<0.05). Conclusion：The proliferation of CRTH2 cells can be greatly promoted by loaded-BCGV-Ag-DCs, and the CRTH2 cells can help B cells to secrete IgG, IgA and IgE.

[Significance of systematic retroperitoneal lymphadenectomy at second-look laparotomy for ovarian cancer].

OBJECTIVE: To investigate the timing and role of systemic retroperitoneal lymphadenectomy in patients with ovarian cancer. METHODS: From Jan. 1987 to Feb. 1994, 50 patients with ovarian cancer, who underwent retroperitoneal lymphadenectomy on second-look laparotomy (SLL), were retrospectively studied. RESULTS: The median age was 49 years. Overall survival at 3 and 5 years were 72% and 62%, respectively. Twenty of 50 (40%) women were found SLL(+), and the rates of positive SLL were related to International Federation of Gynecology Obstetrics (FIGO) stage, with 16% in stage I and II, 64% in stage III and IV (P < 0.01). Sixteen (32%) women were found to have retroperitoneal lymph nodes metastases at SLL, with 0% (0/15), 20% (2/10), 54% (13/24), 1/1 in stage I, II, III, IV respectively. In patients with SLL(+), 4 patients with sole disease in the pelvis, and 6 (12%) women only with micro-metastases of retroperitoneal lymph nodes. Fifteen patients with stage I ovarian cancer were all SLL(-), and SLL(-) were in 6 (60%) patients with stage II disease and 11 (38%) in stage III. There is no disease recurrence in patients with negative SLL till the data censored. CONCLUSION: Timing of systemic retroperitoneal lymphadenectomy at SLL is rational, and may aid in reducing disease recurrence of negative SLL and improving five-year survival rate in patients with ovarian cancer, especially in those with advanced epithelial ovarian cancer.

Prunus pananensis (Rosaceae), a new species from Pan'an of central Zhejiang, China.

Prunus pananensis Z. L. Chen, W. J. Chen & X. F. Jin, a new species of Rosaceae from central Zhejiang, China is described and illustrated. Micromorphological characters of the indumentum on young shoots, leaves, petioles and peduncles, including scanning electron microscope [SEM] images, are provided. This new species is morphologically similar to P. schneiderianae Koehne in having its young shoots, petioles and pedicels all densely villose, but differs in having bracts persistent, styles glabrous, stipules 8-9 mm long, stamens 28-30 of per flower, and drupes glabrous. The new species is also similar to P. discoidea (Yü & C. L. Li) Yü & C. L. Li ex Z. Wei & Y. B. Chang in having 2 or 3 flowers in an umbellate inflorescence, and bracts persistent and marginally glandular, but it differs in having young shoots and petioles densely covered with yellowish-brown villose trichomes; leaves rounded or slightly cordate at base, the mid-ribs and lateral veins abaxially densely covered with yellowish-brown villose trichomes; and hypanthium ca. 3 mm long, shorter than sepals. The atpB-rbcL and trnL-F intergenic chloroplast spacers are selected for identification of the new and its similar species.

[Prognosis of patients with stage Ib-IIb node-positive cervical carcinoma].

BACKGROUND & OBJECTIVE: Pelvic lymph node metastasis was the important prognostic factor for the patients with cervical carcinoma. However, the relationship among the number of positive nodes, site of metastatic nodes, adjuvant therapy, and the prognosis were unknown. The purpose of this study was to investigate the variables that could predict the prognosis of the patients with stage Ib-IIb node-positive cervical carcinoma. METHODS: Sixty-six patients with stage Ib-IIb cervical carcinoma who underwent radical hysterectomy and pelvic lymphadenectomy were analyzed retrospectively. Potential prognostic variables were studied by Cox proportional hazard model. RESULTS: The 5-year survival rate of the patients with pelvic lymph node metastasis was 40.7%. Cox proportional hazard model analysis showed cellular differentiation, number of positive nodes, and adjuvant therapy were the important prognostic factors (P< 0.05). The 5-year survival rate of patients with one positive node (56.5%) was higher than that (36.4%) of those with two or more positive nodes (P< 0.05). The former's distant metastatic rate (5.9%) was lower than the latter's (32.7%) (P=0.05). However, there was no difference of pelvic recurrence between them (P >0.05). The 5-year survival rate of the patients who had no adjuvant therapy (12.6%) was much lower than that (53.7%) of those with adjuvant therapy (P< 0.05). However, the differences of the effects among adjuvant radiotherapy, chemotherapy, and chemoradiotherapy were not obvious (P >0.05). CONCLUSION: The prognosis of patients with stage Ib-IIb node-positive cervical carcinoma who underwent radical surgery was poor. Adjuvant therapy can improve the survival rate, decrease the pelvic recurrence and distant metastasis.