Quantifying the Sensitivity of Human Immune Cells to Chemoattractant

Emmet A. Francis, Volkmar Heinrich

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The efficient recruitment of immune cells is a vital cornerstone of our defense against infections and a key challenge of immunotherapeutic applications. It relies on the ability of chemotaxing cells to prioritize their responses to different stimuli. For example, immune cells are known to abandon gradients of host-cell-produced cytokines in favor of complement-derived anaphylatoxins, which then guide the cells toward nearby pathogen surfaces. The aptitude to triage stimuli depends on the cells’ specific sensitivities to different chemoattractants. We here use human neutrophils as uniquely capable biodetectors to map out the anaphylatoxic cloud that surrounds microbes in the presence of host serum. We quantify the neutrophil sensitivity in terms of the ratio between the chemoattractant concentration c and the production rate j0 of the chemoattractant at the source surface. An integrative experimental/theoretical approach allows us to estimate the c/j0-threshold at which human neutrophils first detect nearby β-glucan surfaces as c/j0 ≈ 0.0044 s/μm.

Original languageEnglish (US)
Pages (from-to)834-837
Number of pages4
JournalBiophysical Journal
Issue number5
StatePublished - Mar 14 2017

ASJC Scopus subject areas

  • Biophysics


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