An Advanced Human Intestinal Coculture Model Reveals Compartmentalized Host and Pathogen Strategies during <i>Salmonella</i> Infection
Leon N. Schulte, Matthias Schweinlin, Alexander J. Westermann, Harshavardhan Janga, Sara Correia Santos, Silke Appenzeller, Heike Walles, Jörg Vogel, Marco Metzger
Abstract
Infection research routinely employs in vitro cell cultures or in vivo mouse models as surrogates of human hosts. Differences between murine and human immunity and the low level of complexity of traditional cell cultures, however, highlight the demand for alternative models that combine the in vivo -like properties of the human system with straightforward experimental perturbation. Here, we introduce a 3D tissue model comprising multiple cell types of the human intestinal barrier, a primary site of pathogen attack. During infection with the foodborne pathogen Salmonella enterica serovar Typhimurium, our model recapitulates human disease aspects, including pathogen restriction to the epithelial compartment, thereby deviating from the systemic infection in mice. Combination of our model with state-of-the-art genetics revealed Salmonella -mediated local manipulations of human immune responses, likely contributing to the establishment of the pathogen’s infection niche. We propose the adoption of similar 3D tissue models to infection biology, to advance our understanding of molecular infection strategies employed by bacterial pathogens in their human host.