Publications by John McKinney | EPFL Graph Search

Related publications (73)

UROPOT: study protocol for a randomized, double-blind phase I/II trial for metabolism-based potentiation of antimicrobial prophylaxis in the urological tract

Background: Urinary tract catheters, including Double-J or ureteral stents, are prone to bacterial colonization forming biofilms and leading to asymptomatic bacteriuria. In the context of asymptomatic bacteriuria, endourological procedures causing mucosa-i ...

2024

Photothermal Off-Resonance Tapping for Rapid and Gentle Atomic Force Imaging of Live Cells

Georg Fantner, John McKinney, Adrian Pascal Nievergelt, Haig Alexander Eskandarian, Charlène Cécile Geneviève Brillard

Imaging living cells by atomic force microscopy (AFM) promises not only high-resolution topographical data, but additionally, mechanical contrast, both of which are not obtainable with other microscopy techniques. Such imaging is however challenging, as ce ...

2018

Single-Cell Tracking Reveals Antibiotic-Induced Changes in Mycobacterial Energy Metabolism

John McKinney, Muhittin Emre Özdemir, Zeljka Maglica

ATP is a key molecule of cell physiology, but despite its importance, there are currently no methods for monitoring single-cell ATP fluctuations in live bacteria. This is a major obstacle in studies of bacterial energy metabolism, because there is a growin ...

American Society for Microbiology2015

A hermetically closed sample chamber enables time-lapse nano-characterization of pathogenic microorganisms in vitro

Georg Fantner, John McKinney, Santiago Harald Andany, Navid Asmari Saadabad, Esther Braun

Pathogenic microorganisms, such as pathogenic mycobacteria, pose a global health burden. Studying these organisms is crucial for gaining detailed knowledge about the pathogens and the diseases they cause. To handle pathogenic organisms, specific biosafety ...

ROYAL SOC CHEMISTRY2025

Mycobacterium tuberculosis Resists Stress by Regulating PE19 Expression

John McKinney, Anna De Graff Tischler

Mycobacterium tuberculosis requires the phosphate-sensing signal transduction system Pst/SenX3-RegX3 to resist host immune responses. A Delta pstA1 mutant lacking a Pst phosphate uptake system component is hypersensitive to diverse stress conditions in vit ...

American Society for Microbiology2016

Microfluidic-assisted bioprinting of tissues and organoids at high cell concentrations

Philippe Renaud, Arnaud Bertsch, John McKinney, Ludovic Serex, Kunal Sharma

Despite its simplicity, which makes it the most commonly used bioprinting method today, extrusion-based bioprinting suffers from its inability to reproduce the complex tissue architecture found in organs. Generally, this printing method allows for the disp ...

IOP PUBLISHING LTD2021

Preexisting Heterogeneity of Inducible Nitric Oxide Synthase Expression Drives Differential Growth of Mycobacterium tuberculosis in Macrophages

John McKinney, Chiara Toniolo, Ophélie Rutschmann

Mycobacterium tuberculosis infection is initiated by the inhalation and implantation of bacteria in the lung alveoli, where they are phagocytosed by macrophages. Even a single bacterium may be sufficient to initiate infection. Thereafter, the clinical outc ...

AMER SOC MICROBIOLOGY2022

Mycobacterium tuberculosis Requires Phosphate-Responsive Gene Regulation To Resist Host Immunity

John McKinney, Anna De Graff Tischler

Mycobacterium tuberculosis persists in the tissues of mammalian hosts despite inducing a robust immune response dominated by the macrophage-activating cytokine gamma interferon (IFN-gamma). We identified the M. tuberculosis phosphate-specific transport (Ps ...

American Society for Microbiology2013

Dynamic Persistence of Antibiotic-Stressed Mycobacteria

John McKinney, Neeraj Dhar, François Signorino-Gelo, Katrin Esther Schneider

Exposure of an isogenic bacterial population to a cidal antibiotic typically fails to eliminate a small fraction of refractory cells. Historically, fractional killing has been attributed to infrequently dividing or nondividing "persisters." Using microflui ...

American Association for the Advancement of Science2013

Mycobacterium tuberculosis persistence mutants identified by screening in isoniazid-treated mice

John McKinney, Neeraj Dhar

Tuberculosis (TB) is notoriously difficult to cure, requiring administration of multiple antibiotics for 6 mo or longer. Conventional anti-TB drugs inhibit biosynthetic processes involved in cell growth and division, such as DNA replication, RNA transcript ...

2010

Preexisting variation in DNA damage response predicts the fate of single mycobacteria under stress

John McKinney, Neeraj Dhar, Giulia Manina

Clonal microbial populations are inherently heterogeneous, and this diversification is often considered as an adaptation strategy. In clinical infections, phenotypic diversity is found to be associated with drug tolerance, which in turn could evolve into g ...

2019

Malachite Green Interferes with Postantibiotic Recovery of Mycobacteria

John McKinney, Neeraj Dhar, Ekaterina Gelman

The genus Mycobacterium comprises slow-growing species with generation times ranging from hours to weeks. The protracted incubation time before colonies appear on solid culture medium can result in overgrowth by faster-growing microorganisms. To prevent co ...

2012

Bacterial strategies for survival in the host

John McKinney, Anna De Graff Tischler

This chapter focuses on the strategies that persistent bacterial pathogens use to evade, subvert, and disarm the host immune system. Bacteria can avoid these host defense mechanisms by presenting the immune system with a continuously evolving antigen reper ...

ASM Press2011

Spontaneous phthiocerol dimycocerosate-deficient variants of Mycobacterium tuberculosis are susceptible to gamma interferon-mediated immunity

John McKinney, Swapna Uplekar, Anna De Graff Tischler

Onset of the adaptive immune response in mice infected with Mycobacterium tuberculosis is accompanied by slowing of bacterial replication and establishment of a chronic infection. Stabilization of bacterial numbers during the chronic phase of infection is ...

2011

A Single-Cell Perspective on Non-Growing but Metabolically Active (NGMA) Bacteria

John McKinney, Giulia Manina

A long-standing and fundamental problem in microbiology is the non-trivial discrimination between live and dead cells. The existence of physically intact and possibly viable bacterial cells that fail to replicate during a more or less protracted period of ...

Springer-Verlag2014

Phenotypic Heterogeneity in Mycobacterium tuberculosis

John McKinney, Neeraj Dhar, Giulia Manina

The interaction between the host and the pathogen is extremely complex and is affected by anatomical, physiological, and immunological diversity in the microenvironments, leading to phenotypic diversity of the pathogen. Phenotypic heterogeneity, defined as ...

Amer Soc Microbiology2016

Do chance encounters between heterogeneous cells shape the outcome of tuberculosis infections?

John McKinney, Chiara Toniolo, Ophélie Rutschmann

The sum of all of the interactions between single bacteria and host cells determines if an infection is cleared, controlled, or progresses at the whole host-organism level. These individual interactions have independent trajectories defined by diverse and ...

2020

Dynamic persistence of UPEC intracellular bacterial communities in a human bladder-chip model of urinary tract infection

Graham Knott, John McKinney, Neeraj Dhar, Vivek Vijay Thacker, François Signorino-Gelo, Kunal Sharma, Thomas Marie Simonet

Uropathogenic Escherichia coli (UPEC) proliferate within superficial bladder umbrella cells to form intracellular bacterial communities (IBCs) during early stages of urinary tract infections. However, the dynamic responses of IBCs to host stresses and anti ...

2021

Uptake-independent killing of macrophages by extracellular Mycobacterium tuberculosis aggregates

John McKinney, Neeraj Dhar, Chiara Toniolo

Mycobacterium tuberculosis (Mtb) infection is initiated by inhalation of bacteria into lung alveoli, where they are phagocytosed by resident macrophages. Intracellular Mtb replication induces the death of the infected macrophages and the release of bacteri ...

WILEY2023

A vitamin B-12 transporter in Mycobacterium tuberculosis

John McKinney

Vitamin B-12-depende enzymes function in core biochemical pathways in Mycobacterium tuberculosis, an obligate pathogen whose metabolism in vivo is poorly understood. Although M. tuberculosis can access vitamin B-12 in vitro, it is uncertain whether the org ...

Royal Society, The2013