Antibiotic treatment for intermittent bladder catheterisation with once daily prophylaxis (the AnTIC study) : Study protocol for a randomised controlled trial

Funder statement This article/paper/report presents independent research funded by the National Institute for Health Research (NIHR). The views expressed are those of the author(s) and not necessarily those of the NHS, the NIHR or the UK Government’s Department of Health. Acknowledgements We would like to acknowledge Dr Graeme MacLennan, Mr Simon Skene, Mr Julian Shah and Dr Nadine Dougall (past member) for their valuable contribution to the study as DMC members. We would like to thank Professor Chris Butler, Dr Emma Hall, Mr Roland Morley, Mr Dan Wood, Ms Jane Laws and Ms Sarah Bittlestone for their oversight of the AnTIC study as members of the TSC, and we would like to thank Ms Heather Armstrong for her contributions as a patient group representative. We thank all Principal Investigators and site staff for their commitment in recruitment for the AnTIC study. Finally, we would like to thank Hazel Wilde for secretarial support. The trial is funded by the NIHR Health Technology Assessment Programme (project reference: 11-72-01) and will be published in full in the Health Technology Assessment journal series. The authors also acknowledge the support of the National Institute for Health Research through the Comprehensive Clinical Research Network.

G1 arrest and down-regulation of cyclin E/cyclin-dependent kinase 2 by the protein kinase inhibitor staurosporine are dependent on the retinoblastoma protein in the bladder carcinoma cell line 5637.

The protein kinase inhibitor staurosporine has been shown to induce G1 phase arrest in normal cells but not in most transformed cells. Staurosporine did not induce G1 phase arrest in the bladder carcinoma cell line 5637 that lacks a functional retinoblastoma protein (pRB-). However, when infected with a pRB-expressing retrovirus [Goodrich, D. W., Chen, Y., Scully, P. & Lee, W.-H. (1992) Cancer Res. 52, 1968-1973], these cells, now pRB+, were arrested by staurosporine in G1 phase. This arrest was accompanied by the accumulation of hypophosphorylated pRB. In both the pRB+ and pRB- cells, cyclin D1-associated kinase activities were reduced on staurosporine treatment. In contrast, cyclin-dependent kinase (CDK) 2 and cyclin E/CDK2 activities were inhibited only in pRB+ cells. Staurosporine treatment did not cause reductions in the protein levels of CDK4, cyclin D1, CDK2, or cyclin E. The CDK inhibitor proteins p21(Waf1/Cip1) and p27 (Kip1) levels increased in staurosporine-treated cells. Immunoprecipitation of CDK2, cyclin E, and p2l from staurosporine-treated pRB+ cells revealed a 2.5- to 3-fold higher ratio of p2l bound to CDK2 compared with staurosporine-treated pRB- cells. In pRB+ cells, p2l was preferentially associated with Thrl6O phosphorylated active CDK2. In pRB- cells, however, p2l was bound preferentially to the unphosphorylated, inactive form of CDK2 even though the phosphorylated form was abundant. This is the first evidence suggesting that G1 arrest by 4 nM staurosporine is dependent on a functional pRB protein. Cell cycle arrest at the pRB- dependent checkpoint may prevent activation of cyclin E/CDK2 by stabilizing its interaction with inhibitor proteins p2l and p27.

Estrogen metabolites for the diagnosis of schistosomiasis associated urinary bladder cancer

Letter to the Editor

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