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Bruce D. McCollister, MD

Assistant Professor


 

Phone: 303-724-4216
E-mail: Bruce.McCollister@ucdenver.edu
Address:  Denver Veterans Affairs Hospital

Medical School
University of Minnesota

Residency
Internal Medicine, University of Colorado School of Medicine 

Fellowship
Infectious Diseases, University of Colorado School of Medicine

  • Salmonella

  • Bacterial Pathogenesis

  • Mechanisms of Antibiotic Resistance

Pub Med Articles

  1. McCollister BD, Hoffman M, Husain M, Vázquez-Torres A. Nitric oxide protects bacteria from aminoglycosides by blocking the energy-dependent phases of drug uptake. Antimicrob Agents Chemother. 2011 May;55(5):2189-96. Epub 2011 Feb 22. PubMed PMID: 21343448; PubMed Central PMCID: PMC3088231.

  2. Jenkins TC, McCollister BD, Sharma R, McFann KK, Madinger NE, Barron M, Bessesen M, Price CS, Burman WJ. Epidemiology of healthcare-associated bloodstream infection caused by USA300 strains of methicillin-resistant Staphylococcus aureus in 3 affiliated hospitals. Infect Control Hosp Epidemiol. 2009 Mar;30(3):233-41. PubMed PMID: 19199535.

  3. Husain M, Bourret TJ, McCollister BD, Jones-Carson J, Laughlin J, Vázquez-Torres A. Nitric oxide evokes an adaptive response to oxidative stress by arresting respiration. J Biol Chem. 2008 Mar 21;283(12):7682-9. Epub 2008 Jan 15. PubMed PMID: 18198179.

  4. McCollister BD, Myers JT, Jones-Carson J, Husain M, Bourret TJ, Vázquez-Torres N(2)O(3) enhances the nitrosative potential of IFNgamma-primed macrophages in response to Salmonella. Immunobiology. 2007;212(9-10):759-69. Epub 2007 Dec 3. PubMed PMID: 18086377; PubMed Central PMCID: PMC2329578.

  5. McCollister BD, Myers JT, Jones-Carson J, Voelker DR, Vázquez-Torres A. Constitutive acid sphingomyelinase enhances early and late macrophage killing of Salmonella enterica serovar Typhimurium. Infect Immun. 2007 Nov;75(11):5346-52. Epub 2007 Aug 13. PubMed PMID: 17698574; PubMed Central PMCID: PMC2168317.

  6. McCollister, B.D., Bourret, T.S., Gill, R., Jones-Carson, J., and A. Vazquez-Torres. Repression of SPI2 transcription by nitric oxide-producing, IFNgamma-activated macrophages promotes maturation of Salmonella phagosomes. J Exp Med. 2005 Sep 5;202(5):625-35.

  7. McCollister, B.D., and A. Vazquez-Torres. 2005. Interactions of Salmonella with phagocytic cells, In P. Mastroeni and D. Maskell, Eds., Salmonella Infections: Clinical, Immunological and Molecular Aspects, Cambridge University Press.

  8. McCollister, B.D., Kreiswirth, B.N., Novick, R.P., Schlievert, P.M. Production of Toxic Shock Syndrome-Like Illness in Rabbits by Staphylococcus aureus D4508: Association with Enterotoxin A. Infect Immunity 58:2067-2070.

 

Evasion of NADPH oxidase by Salmonella lipases

Grant ID: 1K08AI053213-01A1

Abstract: DESCRIPTION (provided by applicant): The ability of Salmonella to survive within professional phagocytes is paramount to its pathogenicity, as strains incapable of survival in mononuclear phagocytes are severely attenuated in mice. Survival of Salmonella within phagocytes is tightly associated with its ability to halt maturation of the phagosome along the endocytic pathway. We have recently discovered that Salmonella pathogenicity island 2 (SPI2)-encoded effector proteins remodel the phagosome by interfering with the TNFalpha/TNFRp55 signaling cascade that directs delivery ofNADPH oxidase-containing vesicles to the vicinity of the Salmonella phagosome. I plan to test the hypothesis that, by cleaving glucosylceramide, glucosylceramidase interferes with TNFRp55 signaling and blocks migration of NADPH oxidase-harboring vesicles to the vicinity of the Salmonella phagosome. The specific aims are: 1) To determine the role of glucosylceramidase in the pathogenesis of Salmonella infections. Glucosylceramidase mutants will be constructed to examine the effect on both survival of Salmonella in macrophages and inhibition NADPH oxidase trafficking. 2) To examine the effect of Salmonella-encoded glucosylceramidase on macrophage lipid metabolism. Wildtype and glucosylceramidase-deficient Salmonella will be used to infect macrophages to assess global changes in the sphingomyelin pathway. Purified glucosylceramidase will be tested for lipid metabolizing activity, and immunocytochemistry will be used to visualize the effect of glycosylceramidase on trafficking of NADPH oxidase-containing vesicles. 3) To determine the role of glucosylceramidase on avoiding IFN( activated trafficking of NADPH oxidase. In this section, I will elucidate the mechanisms by which IFN\gamma stimulates anti-Salmonella activity dependent upon the NADPH oxidase. The ability of IFNgamma to stimulate glucosylceramide synthesis will be examined as well. These studies will not only enhance our understanding of Salmonella pathogenesis but will also identify potential targets for the development of new therapeutic strategies against intracellular pathogens.

Type: NIH Grant