Toll-like Receptor Signaling Pathway
TLR4 TLR5 TLR2/6 TLR1/2 Apoptosis PI3K JNK ERK p38
MAPK IKK IκB AP-1 AP-1 NF-κB NF-κB Rac1 MEK1/2 Caspase-8 Akt Immune Response Inflammation Cytokines
MAPK IKK IκB AP-1 AP-1 NF-κB NF-κB Rac1 MEK1/2 Caspase-8 Akt Immune Response Inflammation Cytokines
The toll-like receptors (TLRs) act in response to molecular patterns found in microbes such as bacteria and viruses that pose a biological threat. The signaling pathway leads to the activation of innate and acquired immunity along with an inflammatory response and the upregulation of cytokines.
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Signaling Pathway Key
![Stimulates Stimulates](https://resources.tocris.com/images/pathways/Kstimulates.png)
Stimulates
![Multistep Upregulation Multistep Upregulation](https://resources.tocris.com/images/pathways/Kmultiupreg.png)
Multistep Upregulation
![Multistep Activation Multistep Activation](https://resources.tocris.com/images/pathways/KmultistepAct.png)
Multistep Activation
![Translocates Translocates](https://resources.tocris.com/images/pathways/Ktranslocates.png)
Translocates
![Kinase Kinase](https://resources.tocris.com/images/pathways/Kkinase.png)
Kinase
![Transcription Factor Transcription Factor](https://resources.tocris.com/images/pathways/KtransFac.png)
Transcription Factor
![Enzyme-linked Receptor Enzyme-linked Receptor](https://resources.tocris.com/images/pathways/KenzLnkRec.png)
Enzyme-linked Receptor
![Other Enzyme Other Enzyme](https://resources.tocris.com/images/pathways/KotherEnz.png)
Other Enzyme
![Other Protein Other Protein](https://resources.tocris.com/images/pathways/KotherProt.png)
Other Protein
![Endosome Endosome](https://resources.tocris.com/images/pathways/Kendosome.png)
Endosome
![](https://resources.tocris.com/pathways/css/img/kinaseHover2-01.png)
![](https://resources.tocris.com/pathways/css/img/otherProtein-01.png)
![](https://resources.tocris.com/pathways/css/img/transcriptionFactor-01.png)
![](https://resources.tocris.com/pathways/css/img/PLC-01.png)
![](https://resources.tocris.com/pathways/css/img/receptorDarker-01.png)
![](https://resources.tocris.com/pathways/css/img/smallProtein-01.png)
![](https://resources.tocris.com/pathways/css/img/GPCR2-01.png)
![](https://resources.tocris.com/pathways/css/img/proapoptotic-01.png)
![](https://resources.tocris.com/pathways/css/img/prosurvival-01.png)
![](https://resources.tocris.com/pathways/css/img/Akthover-01.png)
![](https://resources.tocris.com/pathways/css/img/phosphatase-01.png)
![](https://resources.tocris.com/pathways/css/img/notchHover.png)
![](https://resources.tocris.com/pathways/css/img/notch2Hover.png)
![](https://resources.tocris.com/pathways/css/img/secretaseHover.png)
![](https://resources.tocris.com/pathways/css/img/largebcat.png)
![](https://resources.tocris.com/pathways/css/img/p53large.png)
![](https://resources.tocris.com/pathways/css/img/nuclearHover.png)
![](https://resources.tocris.com/pathways/css/img/estrogenHover.png)