L. monocytogenes causes abortions and preterm labor. Robbins et al. (see doi:10.1371/journal.ppat.1000732) used first trimester human placental organ cultures to quantitatively analyze how L. monocytogenes breaches the maternal-fetal barrier. The syncytiotrophoblast (red), which constitutes most of the placental surface and is bathed in maternal blood in vivo, is highly resistant to L. monocytogenes infection. Instead, extravillous cytotrophoblasts, which anchor the placenta in the uterus, serve as the primary portal of entry for L. monocytogenes (green). Nuclei are blue.
Image Credit: Jennifer R. Robbins and Anna I. Bakardjiev, University of California, San Francisco
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