%0 Journal Article %T Small Leucine %A Andrea Janicova %A Heiko Roedig %A Liliana Schaefer %A Louise Tzung-Harn Hsieh %A Madalina V. Nastase %A Malgorzata Wygrecka %J Journal of Histochemistry & Cytochemistry %@ 1551-5044 %D 2018 %R 10.1369/0022155417738752 %X It is now well-established that members of the small leucine-rich proteoglycan (SLRP) family act in their soluble form, released proteolytically from the extracellular matrix (ECM), as danger-associated molecular patterns (DAMPs). By interacting with Toll-like receptors (TLRs) and the inflammasome, the two SLRPs, biglycan and decorin, autonomously trigger sterile inflammation. Recent data indicate that these SLRPs, besides their conventional role as pro-inflammatory DAMPs, additionally trigger anti-inflammatory signaling pathways to tightly control inflammation. This is brought about by selective employment of TLRs, their co-receptors, various adaptor molecules, and through crosstalk between SLRP-, reactive oxygen species (ROS)-, and sphingolipid-signaling. In this review, the complexity of SLRP signaling in immune and kidney resident cells and its relevance for renal inflammation is discussed. We propose that the dichotomy in SLRP signaling (pro- and anti-inflammatory) allows for fine-tuning the inflammatory response, which is decisive for the outcome of inflammatory kidney diseases %K autophagy %K biglycan %K decorin %K extracellular matrix %K fibrosis %K inflammasome %K inflammation %K innate immunity %K sphingosine kinase %K TGF-¦Â %K Toll-like receptor %U https://journals.sagepub.com/doi/full/10.1369/0022155417738752