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2017 ; 46
(4
): 609-620
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A Tunable Diffusion-Consumption Mechanism of Cytokine Propagation Enables
Plasticity in Cell-to-Cell Communication in the Immune System
#MMPMID28389069
Oyler-Yaniv A
; Oyler-Yaniv J
; Whitlock BM
; Liu Z
; Germain RN
; Huse M
; Altan-Bonnet G
; Krichevsky O
Immunity
2017[Apr]; 46
(4
): 609-620
PMID28389069
show ga
Immune cells communicate by exchanging cytokines to achieve a context-appropriate
response, but the distances over which such communication happens are not known.
Here, we used theoretical considerations and experimental models of immune
responses in vitro and in vivo to quantify the spatial extent of cytokine
communications in dense tissues. We established that competition between cytokine
diffusion and consumption generated spatial niches of high cytokine
concentrations with sharp boundaries. The size of these self-assembled niches
scaled with the density of cytokine-consuming cells, a parameter that gets tuned
during immune responses. In vivo, we measured interactions on length scales of
80-120 ?m, which resulted in a high degree of cell-to-cell variance in cytokine
exposure. Such heterogeneous distributions of cytokines were a source of
non-genetic cell-to-cell variability that is often overlooked in single-cell
studies. Our findings thus provide a basis for understanding variability in the
patterning of immune responses by diffusible factors.