Imaging Lymphoid Cell Death In Vivo During Polymicrobial Sepsis

Critical Care Medicine
Lin ZouWei Chao

Abstract

Cell death in lymphatic organs, such as the spleen, is in part responsible for immunosuppression and contributes to mortality during sepsis. An early and noninvasive detection of lymphoid cell death could thus have significant clinical implications. Here, we tested in vivo imaging of lymphoid cell death using a near-infrared annexin V (AV-750). Animal study. Laboratory investigation. C57BL/6J wild-type and toll-like receptor 3 knockout mice. Mild and severe polymicrobial sepsis was induced with cecum ligation and puncture. Serum cytokines and acute kidney injury markers were tested by immunoassay and quantitative reverse transcription-polymerase chain reaction, respectively. Sepsis-induced lymphoid cell death was detected by fluorescent AV-750 accumulation in the thorax and abdomen (in vivo), in isolated organs (ex vivo), and in isolated cells (flow cytometry). Caspase-3 cleavage/activity and terminal deoxynucleotidyl transferase dUTP nick-end labeling staining were tested for apoptosis. Severe sepsis induced marked apoptosis in the thymus, spleen, and liver as demonstrated by cleaved caspase-3 and an increase in caspase-3 activity and terminal deoxynucleotidyl transferase dUTP nick-end labeling-positive cells. A significant in...Continue Reading

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Nov 5, 2016·Apoptosis : an International Journal on Programmed Cell Death·Thibaut GirardotGuillaume Monneret
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