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Shigella Effectors at Work - EMBO

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Antimicrobial<br />

molecules<br />

COMMENSALS<br />

Absence (limit<strong>at</strong>ion) of virulence factors<br />

PAMPs less agonist ?<br />

Sequestr<strong>at</strong>ion, weak activity of TLRs<br />

Life in biofilms on mucus surface<br />

Controled diffusion and sampling of PAMPs<br />

And prokaryotic signalis<strong>at</strong>ion molecules<br />

TLR<br />

QSM MDP<br />

OCTN2 PepT1<br />

?<br />

Regul<strong>at</strong>ory<br />

cascade<br />

NLR<br />

Regul<strong>at</strong>ory genes<br />

Regul<strong>at</strong>ory cytokines, chemokines<br />

Mucus<br />

Imm<strong>at</strong>ure DC & MΦ M<br />

Treg<br />

DC<br />

PATHOGENS<br />

Mucinases<br />

Adhesins / Invasins<br />

Type III / IV secretory systems<br />

Hemolysins<br />

Massive engagement of TLRs, NLRs<br />

Eradic<strong>at</strong>ion of commensal fmicrobiota (niche occupancy)<br />

+ Dampening inn<strong>at</strong>e / inflamm<strong>at</strong>ory responses<br />

TLR<br />

PMN<br />

Pro-inflamm<strong>at</strong>ory<br />

cascade<br />

NLR<br />

Pro-inflamm<strong>at</strong>ory Pro-inflamm<strong>at</strong>ory<br />

genes<br />

Pro-inflamm<strong>at</strong>ory<br />

Pro-inflamm<strong>at</strong>ory<br />

cytokines, chemokines<br />

Activ<strong>at</strong>ed DC & MΦ M<br />

Th1 / Th17<br />

PMN

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