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Heparanase is required for activation and function of macrophages #MMPMID27849593
Gutter-Kapon L; Alishekevitz D; Shaked Y; Li JP; Aronheim A; Ilan N; Vlodavsky I
Proc Natl Acad Sci U S A 2016[Nov]; 113 (48): E7808-17 PMID27849593show ga
The tumor microenvironment is now considered to play a major role in cancer growth and metastasis. Heparanase is the only enzyme in mammals capable of cleaving heparan sulfate, an activity that is highly implicated in tumor growth, metastasis, and inflammation. Here we provide evidence that heparanase is critically required for the activation and function of macrophages, an important constituent of the tumor microenvironment. Mechanistically, we describe a linear cascade by which heparanase activates Erk, p38, and JNK signaling in macrophages, leading to increased c-Fos levels and induction of cytokine expression in a manner that apparently does not require heparanase enzymatic activity. These results identify heparanase as a key mediator of macrophage activation and function in tumorigenesis and cross-talk with the tumor microenvironment.