Secreted protein that acts as a key regulator of lysosomal function and as a growth factor involved in inflammation, wound healing and cell proliferation (PubMed:28073925, PubMed:8496151, PubMed:28541286, PubMed:28453791, PubMed:20026663, PubMed:23041626, PubMed:27789271, PubMed:12524533).
Regulates protein trafficking to lysosomes and, also the activity of lysosomal enzymes (PubMed:28453791, PubMed:28541286, PubMed:27789271).
Facilitates also the acidification of lysosomes, causing degradation of mature CTSD by CTSB (PubMed:28073925).
In addition, functions as wound-related growth factor that acts directly on dermal fibroblasts and endothelial cells to promote division, migration and the formation of capillary-like tubule structures (PubMed:12524533).
Also promotes epithelial cell proliferation by blocking TNF-mediated neutrophil activation preventing release of oxidants and proteases (PubMed:8496151).
Moreover, modulates inflammation in neurons by preserving neurons survival, axonal outgrowth and neuronal integrity (PubMed:23041626, PubMed:20026663).
Inhibits epithelial cell proliferation and induces epithelial cells to secrete IL-8.
Stabilizes CTSD through interaction with CTSD leading to maintain its aspartic-type peptidase activity.
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