• A key role for the GINS complex at DNA replication forks

      Labib, Karim; Gambus, Agnieszka; Cancer Research U.K., Paterson Institute for Cancer Research, University of Manchester, Manchester, UK. klabib@picr.man.ac.uk <klabib@picr.man.ac.uk> (2007-06)
      The GINS complex is the most recently identified component of the eukaryotic DNA replication machinery and is required both for the initiation of chromosome replication and also for the normal progression of DNA replication forks. Several recent studies suggest that GINS associates at replication forks with the MCM helicase that is responsible for unwinding the parental DNA duplex. Archaea also have an equivalent GINS complex that can interact with MCM and other replisome components. It seems likely that GINS couples MCM to other key proteins at forks, and we discuss here the current literature regarding this important late-comer to the DNA replication field.
    • Key steps in vaccine development

      Stern, Peter L; University of Manchester, UK (2020)
      OBJECTIVE: The goal of a vaccine is to prime the immune response so the immune memory can facilitate a rapid response to adequately control the pathogen on natural infection and prevent disease manifestation. This article reviews the main elements that provide for the development of safe and effective vaccines Data Sources: Literature covering target pathogen epidemiology, the key aspects of the functioning immune response underwriting target antigen selection, optimal vaccine formulation, preclinical and clinical trial studies necessary to deliver safe and efficacious immunization. STUDY SELECTIONS: Whole live, inactivated, attenuated or partial fractionated organism based vaccines are discussed in respect of the balance of reactogenicity and immunogenicity. The use of adjuvants to compensate for reduced immunogenicity is described. The requirements from preclinical studies, including establishing a proof of principle in animal models, the design of clinical trials with healthy volunteers that that lead to licensure and beyond are reviewed. RESULTS: The three vaccine development phases, preclinical, clinical and post licensure integrate the requirements to ensure safety, immunogenicity and efficacy in the final licensed product. Continuing monitoring of efficacy and safety in the immunized populations is essential to sustain confidence in vaccination programs. CONCLUSION: In an era of increasing vaccine hesitancy the need for a better and widespread understanding of how immunization acts to counteract the continuing and changing risks from the pathogenic world is required. This demands a societal responsibility for obligate education on the benefits of vaccination, which as a medical intervention has saved more lives than any other procedure.
    • KEYNOTE-966 trial in progress: Pembrolizumab plus gemcitabine and cisplatin for advanced biliary tract cancer

      Valle, Juan W; Kelley, R. K.; Furuse, J.; Edeline, J.; Finn, R. S.; Ren, Z.; Su, S. C.; Malhotra, U.; Siegel, A. B.; Vogel, A.; et al. (2020)
      Background: Biliary tract cancer (BTC), comprising intra- and extra-hepatic cholangiocarcinoma and gallbladder cancer, is a rare and aggressive malignancy. Most patients (pts) present with advanced or unresectable disease, for which the current standard of care is gemcitabine plus cisplatin. Median survival for these pts is only 12 months, highlighting the need for more effective therapies. Pembrolizumab is a PD-1inhibitor that has demonstrated modest antitumor activity as monotherapy in pts with previously treated BTC and has improved survival when used in combination with platinum-based chemotherapy in other cancer types.
    • Kin4 kinase delays mitotic exit in response to spindle alignment defects.

      Pereira, Gislene; Schiebel, Elmar; Faculty of Life Sciences, University of Manchester, Oxford Road, Manchester M13 9PT, UK. gislene.pereira@manchester.ac.uk (2005-07-22)
      For many polarized cells, it is critical that the mitotic spindle becomes positioned relative to the polarity axis. This is especially important in yeast, where the site of cytokinesis is predetermined. The spindle position checkpoint (SPOC) therefore delays mitotic exit of cells with a mispositioned spindle. One component of the SPOC is the Bub2-Bfa1 complex, an inhibitor of the mitotic exit network (MEN). Here, we show that the Kin4 kinase is a component of the SPOC and as such is essential to delay cell cycle progression of cells with a misaligned spindle. When spindles are correctly oriented, Kin4 and Bub2-Bfa1 are asymmetrically localized to opposite spindle pole bodies (SPBs). Bub2-Bfa1 then becomes inhibited by Cdc5 polo kinase with anaphase onset, a prerequisite for mitotic exit. In response to spindle misalignment, Kin4 and Bub2-Bfa1 are brought together at both SPBs. Kin4 now maintains Bub2-Bfa1 activity by counteracting Cdc5, thereby inhibiting mitotic exit.
    • Kinetic response of haemopoietic cell lineages to growth factors in vivo: their relationship to the microarchitecture of the tissue and its microenvironment.

      Lord, Brian I; Department of Experimental Haematology, Paterson Institute for Cancer Research, Christie Hospital and Holt Radium Institute, Manchester, United Kingdom. (1990)
    • Kinetics and mechanism of the reduction of ferricytochrome c by the superoxide anion.

      Butler, John; Koppenol, W H; Margoliash, E; Department of Biophysical Chemistry, Paterson Laboratories, Christie Hospital and Holt Radium Institute, Manchester, M20 9BX, United Kingdom (1982-09-25)
      The temperature and pH dependence of the reaction of the superoxide radical anion with ferricytochrome c have been measured using the pulse-radiolysis technique. The temperature dependence of the reaction at low ionic strength yields an activation energy of 31 +/- 5 kJ/mol as compared to 14 +/- 3 kJ/mol for the reaction of CO2.(-) under the same conditions. The pH dependence fits the single pK'a of ferricytochrome c of 9.1. The bimolecular rate constant for the reaction of the superoxide anion with ferricytochrome c at pH 7.8, 21 +/- 2 degrees C, in the presence of 50 mM phosphate and 0.1 mM EDTA is (2.6 +/- 0.1) X 10(5) M-1 s-1. Using this value, 1 unit of superoxide dismutase activity (McCord, J. M., and Fridovich, I. (1969) J. Biol. Chem. 244, 6049-6055) is calculated to be 3.6 +/- 0.3 pmol of enzyme if the assay is performed in a total volume of 3.0 ml. Copper ions reduce the yield of the reaction of ferricytochrome c with CO2.(-). The reactivities of native and singly modified 4-carboxy-2,4-dinitrophenyllysine cytochromes c towards the superoxide anion radical are in the order native greater than 4-carboxy-2,4-dinitrophenyllysine 60 greater than lysine 13 greater than lysine 87 greater than lysine 27 greater than lysine 86 greater than lysine 72, indicating that electron transfer takes place at or close to the solvent accessible heme edge. The mechanism of the reaction is discussed in terms of the approach of superoxide anion radicals to the heme edge and the available molecular orbitals of both heme and free radicals.
    • Kinetics and possible regulation of crypt cell populations under normal and stress conditions.

      Potten, Christopher S; Paterson Laboratories, Christie Hospital and Holt Radium Institute, Manchester (1975)
      The proliferative organisation of the crypts of the small intestine is considered with special reference to the existence, location and numbers of stem cells. It is concluded that the crypt contains a minority population of cells at its base that are the true stem cells. These cells provide an input of cells for the larger proliferative compartment higher up the crypt. The presumptive stem cells may be pluripotent and produce Paneth, goblet and columnar cells. They are probably also the cells which are capable of regenerating the crypt after X-ray depopulation. Radiobiological experiments indicate that the number of cryptogenic cells is less than 80, while the results of several experiments on the kinetics of the cell populations indicate that the number of stem cells is about 20. The stem cells are located in the Paneth cell zone of the crypt, and are apparently passing through the cell cycle at about half the speed of the proliferative cells. It is these vital stem cells that will determine the response of the mucosa to therapeutic agents, probably play a role in carcinogenesis and play a dominant role in mechanisms controlling cell proliferation.
    • Kinetics of cell replacement in the stratum granulosum of mouse tongue epithelium.

      Hume, W J; Paterson Laboratories, Christie Hospital and Holt Radium Institute, Withington, Manchester M20 9BX, U.K. (1986-03)
      Sheet preparations of the stratum granulosum from the epithelium of the ventral surface of mouse tongue permit examination of cell replacement of this maturation compartment of the tissue. The cell transit rate/day is related to the cell desquamation rate and the cell production rate. The latter is approximately 6500-8000 cells/mm2/day, suggesting a 4-5-fold greater turnover compared with mouse dorsal skin epithelium. The use of [3H]IUdR and [3H]TdR at different times of day provides evidence for a reutilization of label from [3H]TdR released during nuclear degradation in the stratum granulosum. Flooding with unlabelled thymidine is not effective in suppressing this reutilization.
    • Kinetics of growth of haemopoietic colony cells in agar.

      Testa, Nydia G; Lord, Brian I; Paterson Laboratories, Christie Hospital and Holt Radium Institute, Manchester (1973-07)
    • The kinetics of hematopoietic stem cells during and after hypoxia. A model analysis.

      Loeffler, M; Herkenrath, P; Wichmann, H E; Lord, Brian I; Murphy, M J; Medizinische Universitätsklinik, Joseph-Stelzmann-Stasse 9, D-5000 Köln 41, Federal Republic of Germany. (1984-12)
      A previously described mathematical model of the hematopoietic stem cell system has been extended to permit a detailed understanding of the data during and after hypoxia. The model includes stem cells, erythroid and granuloid progenitors and precursors. Concerning the intramedullary feedback mechanisms two basic assumptions are made: 1) The fraction "a" of CFU-S in active cell cycle is regulated. Reduced cell densities of CFU-S, progenitors or precursors lead to an accelerated stem cell cycling. Enlarged cell densities suppress cycling. 2) The self renewal probability "p" of CFU-S is also regulated. The normal steady state is described by p = 0.5, indicating that on statistical average each dividing mother stem cell is replaced by one daughter stem cell, while the second differentiates. Diminished cell densities of CFU-S or enlarged densities of progenitors and precursors induce a more intensive self renewal (p greater than 0.5), such that the stem cell number increases. The self renewal probability declines (p less than 0.5) if too many CFU-S or too few progenitors and precursors are present. The model reproduces bone marrow data for CFU-S, BFU-E, CFU-C, CFU-E, 59 Fe-uptake and nucleated cells in hypoxia and posthypoxia. Although the ratio of differentiation into the erythroid and granuloid cell lines is kept constant in the model, a changing ratio of CFU-E and CFU-C results. The model suggests that stem cells and progenitor cells are regulated by a regulatory interference of erythropoiesis and granulopoiesis.
    • Kinetics of neutrophil production in normal and neutropenic animals during the response to filgrastim (r-metHu G-CSF) or filgrastim SD/01 (PEG-r-metHu G-CSF).

      Lord, Brian I; Woolford, Lorna B; Molineux, Graham; CRC Experimental Haematology Group, Paterson Institute for Cancer Research, Christie Hospital NHS Trust, Manchester M20 4BX, United Kingdom. blord@picr.man.ac.uk (2001-07)
      Filgrastim G-CSF has a short, biologically active half-life, and its effective use depends on repeated inoculations. A major aim, therefore, has been to develop a once-per-chemotherapy cycle formulation. To this end, a polyethylene glycolylated form of Filgrastim, known as SD/01, has been developed. In this study, we compared the cellular kinetics of granulocyte production in mice stimulated with SD/01 and granulocyte colony-stimulating factor (G-CSF). Mice were injected with a single dose of SD/01 (1 mg/kg) or G-CSF (125 microg/kg) twice per day for 4 days. Mice rendered leukopenic with a single injection of cyclophosphamide (200 mg/kg) and temozolomide (90 mg/kg) were similarly treated at their 3-day neutrophil nadir. Tritiated thymidine was injected for autoradiographic labeling studies. Bone marrow labeling indices and the release of labeled neutrophils and monocytes into the peripheral blood were assessed. Granulocytopoiesis was stimulated similarly by both SD/01 and G-CSF in both normal and neutropenic animals, with counts rising to >20 x 10(9) polymorphonuclear neutrophils/l in both cases. Bone marrow thymidine labeling indices were increased, indicating a greater proportion of cells in DNA synthesis and an elevated proliferative activity. Compared with the normally slow release of neutrophils into the peripheral blood, labeled neutrophils (and monocytes) were rapidly released, increasing to peak levels at approximately 24 h. The peripheral half-life of neutrophils was not significantly different from normal, and the mitotic amplification factors for increase in granulocytopoiesis, accounted for by 3-3.9 extra cell divisions, were comparable for both factors. We conclude that neutrophil kinetics are stimulated in the same way and to the same extent by both SD/01 and G-CSF.
    • Kinetics of the recognizable erythrocyte precursor cells.

      Lord, Brian I; Paterson Laboratories, Christie Hospital and Holt Radium Institute, Manchester (1979-06)
    • KRAS induces lung tumorigenesis through microRNAs modulation.

      Shi, Lei; Middleton, J; Jeon, Y; Magee, Peter; Veneziano, D; Laganà, A; Leong, Hui Sun; Sahoo, Sudhakar; Fassan, M; Booton, R; et al. (2018-02-13)
      Oncogenic KRAS induces tumor onset and development by modulating gene expression via different molecular mechanisms. MicroRNAs (miRNAs) are small non-coding RNAs that have been established as main players in tumorigenesis. By overexpressing wild type or mutant KRAS (KRASG12D) and using inducible human and mouse cell lines, we analyzed KRAS-regulated microRNAs in non-small-cell lung cancer (NSCLC). We show that miR-30c and miR-21 are significantly upregulated by both KRAS isoforms and induce drug resistance and enhance cell migration/invasion via inhibiting crucial tumor suppressor genes, such as NF1, RASA1, BID, and RASSF8. MiR-30c and miR-21 levels were significantly elevated in tumors from patients that underwent surgical resection of early stages NSCLC compared to normal lung and in plasma from the same patients. Systemic delivery of LNA-anti-miR-21 in combination with cisplatin in vivo completely suppressed the development of lung tumors in a mouse model of lung cancer. Mechanistically, we demonstrated that ELK1 is responsible for miR-30c and miR-21 transcriptional activation by direct binding to the miRNA proximal promoter regions. In summary, our study defines that miR-30c and miR-21 may be valid biomarkers for early NSCLC detection and their silencing could be beneficial for therapeutic applications.
    • KRAS Subtypes in non-small cell lung cancer (NSCLC) within Phase I of the Cancer Research UK Stratified Medicine Programme (SMP1).

      Lindsay, C; Shaw, E; Popat, S; Blyth, K; Walker, I; Chaturvedi, A; Dick, C; Rassl, D; Taniere, P; Johnson, P; et al. (2018-01)
    • A KRAS-responsive long non-coding RNA controls microRNA processing

      Shi, Lei; Magee, Peter; Fassan, M.; Sahoo, Sudhakar; Leong, Hui Sun; Lee, Dave; Sellers, Robert; Brullé-Soumaré, L.; Cairo, S.; Monteverde, Tiziana; et al. (2021)
      Wild-type KRAS (KRASWT) amplification has been shown to be a secondary means of KRAS activation in cancer and associated with poor survival. Nevertheless, the precise role of KRASWT overexpression in lung cancer progression is largely unexplored. Here, we identify and characterize a KRAS-responsive lncRNA, KIMAT1 (ENSG00000228709) and show that it correlates with KRAS levels both in cell lines and in lung cancer specimens. Mechanistically, KIMAT1 is a MYC target and drives lung tumorigenesis by promoting the processing of oncogenic microRNAs (miRNAs) through DHX9 and NPM1 stabilization while halting the biogenesis of miRNAs with tumor suppressor function via MYC-dependent silencing of p21, a component of the Microprocessor Complex. KIMAT1 knockdown suppresses not only KRAS expression but also KRAS downstream signaling, thereby arresting lung cancer growth in vitro and in vivo. Taken together, this study uncovers a role for KIMAT1 in maintaining a positive feedback loop that sustains KRAS signaling during lung cancer progression and provides a proof of principle that interfering with KIMAT1 could be a strategy to hamper KRAS-induced tumorigenesis.
    • Lack of a relationship between colony-forming efficiency and surviving fraction at 2 Gy.

      West, Catharine M L; Davidson, Susan E; Pool, Claire; James, Roger D; Schofield, Philip F; Cancer Research Campaign Department of Radiobiology, Paterson Institute for Cancer Research, Manchester, United Kingdom. (1991-05)
      The relationship between in vitro radiation sensitivity and colony-forming efficiency has been examined for primary human tumors of the cervix, colorectum, and lymph gland. Tumors were cultured using the Courtenay-Mills soft agar clonogenic assay and radiosensitivity was assessed as surviving fraction at 2 Gy. There was no correlation between colony-forming efficiency and surviving fraction at 2 Gy, giving confidence to the use of surviving fraction at 2 Gy as a predictor of clinical outcome.
    • Lack of association between in vitro clonogenic growth of human cervical carcinoma and tumour stage, differentiation, patient age, host cell infiltration or patient survival.

      Davidson, Susan E; West, Catharine M L; Hunter, Robin D; Cancer Research Campaign Department of Experimental Radiation Oncology, Paterson Institute for Cancer Research, Manchester, UK. (1992-01-02)
      Biopsies from 117 patients with cervical carcinoma were studied using a clonogenic assay to assess in vitro growth. Successful colony growth was achieved in 84 tumours (72%) with a mean colony-forming efficiency (CFE), based on total viable nucleated cell counts, of 0.18 +/- 0.49% (+/- 1 standard deviation). There was a wide range of values, from 0.003-4.28%, with a coefficient of variation of 272%. The relationship between clinical features of cervical carcinoma and in vitro colony formation was investigated. No significant association was demonstrated between in vitro growth and either clinical stage (r = 0.02), tumour differentiation (r = -0.08) or patient age (r = -0.12). There was no significant difference in tumour grade between the group of tumours which failed to grow in culture and those which grew well (p = 0.70). In addition, there was no correlation between CFE and the degree of macrophage (r = 0.001), lymphocyte (r = 0.12), or granulocyte (r = 0.08) infiltration. There was no significant difference between CFEs of tumours from patients who had died and from those who were alive and well after a minimum of 2 years' follow-up after radiotherapy (p = 0.51). Ability to form colonies in agar was not associated with a worse prognosis (p = 0.49). Although CFE is an independent biological parameter, our results suggest that, for cervical carcinoma, it is not useful as a univariate prognostic factor.
    • Lack of association of HLA polymorphisms with human papillomavirus-related cervical cancer.

      Glew, Susan S; Duggan-Keen, Margaret F; Ghosh, Anna K; Ivinson, A; Sinnott, P; Davidson, J; Dyer, P A; Stern, Peter L; Department of Immunology, Paterson Institute for Cancer Research, Christie Hospital NHS Trust, Manchester, England. (1993-07)
      An association of HLA-DQ3 with SCC of the cervix has been reported by researchers in Germany and Norway. This article documents a similar-sized study with patients and controls from northwest England. We report in detail on serologically determined HLA polymorphism in SCC patients with respect to HPV 16 infection, MHC class II expression within the tumor, serologic response to HPV, and other relevant clinical variables. We have also extended our studies to include DNA-based analysis using PCR and SSO probes for HLA-DQ. No significant association of any HLA-A, -B, -C, -DR, or -DQ antigen with SCC patients was found. While a possible explanation of the differences among studies could be a reflection of disease heterogeneity, the several tumor and clinical factors examined do not account for the observed differences from previous reports. Further studies are needed for a greater understanding of the interaction of HPV and HLA type in the development of cervical neoplasia.
    • Lack of consensus identifies important areas for future clinical research: Advanced Prostate Cancer Consensus Conference (APCCC) 2019 findings

      Vogl, U. M.; Beer, T. M.; Davis, I. D.; Shore, N. D.; Sweeney, C. J.; Ost, P.; Attard, G.; Bossi, A.; de Bono, J.; Drake, C. G.; et al. (2021)
    • Lack of correlation between differentiation status and response to radiation of three murine squamous cell carcinomas.

      Moore, James V; Moses, R; Cowie, V; Paterson Laboratories, Christie Hospital and Holt Radium Institute, Manchester M20 9BX (1985)
      The gross growth rate, histology, cellular kinetics, and in situ radiobiological response have been measured for three murine, keratinising squamous cell carcinomas that differed in their degree of differentiation. Growth rate was fastest in the least-differentiated tumour, slowest in the best-differentiated. However, the kinetics of the compartment of undifferentiated cells that are likely to be radiotherapeutically important, were the same for the three lines. There was no correlation between degree of differentiation and intrinsic or apparent radiosensitivity as measured by the growth delay assay. The radiobiologically best-oxygenated tumour was that which has the largest stromal component and this was not the best-differentiated tumour.