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New imaging technique tracks traffic patterns of white blood cells

Researchers at Mount Sinai School of Medicine have just developed an advanced imaging technique to capture the movement of the microdomains of leukocytes or white blood cells. Microdomains are restricted areas on the surface of the cells in which receptors and signaling molecules accumulate during cell activation. Using digital multi-channel videomicroscopy, researchers were able to view white blood cell subsets and their forming microdomains in the vascular system in real time. In the upcoming March issue of Nature Methods, the new research displays the migration and inner workings of white blood cells in the small veins and bone marrow of mice.

"Intravital micropscopy (IVM) has contributed enormously to the recent mechanistic advances in leukocyte trafficking," wrote Mount Sinai School of Medicine researchers lead author Elaine Y. Chiang, Andres Hidalgo, Jungshan Chang and Paul S. Frenette of the Department of Medicine’s Immunobiology Center and Black Family Stem Cell Institute in New York. "Multichannel digital fluorescence videomicropscopy vastly improves on prior intravital observations of leukocyte behavior in vivo by allowing the near-simultaneous observation of cell surface markers and microdomains."

Researchers explored various mouse models including that of Sickle Cell disease which is a common inherited blood disorder in the United States, affecting 72,000 Americans according to the National Institutes of Health (NIH). Sickle Cell disease is a blood disorder that affects hemoglobin, a protein inside red blood cells that help carry oxygen throughout the body. Abnormal hemoglobin polymerizes, and red blood cells become sickle-shaped. Sickle-shaped red blood cells then clog blood vessels by sticking to white blood cells and depriving the body of needed oxygen.

Using this new imaging method, red blood cells in a mouse model of Sickle Cell disease were shown to interact specifically with neutrophils, a subset of inflammatory white
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Source:The Mount Sinai Hospital / Mount Sinai School of Medicine


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