Has an antitumor activity (PubMed:8742060).Was found to be a marker of late differentiation of the skin. Implicated in maintaining the physiological and structural integrity of the keratinocyte layers of the skin (PubMed:14721776, PubMed:17008884).In vitro down-regulates keratinocyte proliferation;the function may involve the proposed role as modulator of nicotinic acetylcholine receptors (nAChRs) activity. In vitro inhibits alpha-7-dependent nAChR currents in an allosteric manner (PubMed:14506129, PubMed:26905431).In T cells may be involved in regulation of intracellular Ca2+ signaling (PubMed:17286989).Seems to have an immunomodulatory function in the cornea (By similarity).The function may implicate a possible role as a scavenger receptor for PLAU thereby blocking PLAU-dependent functions of PLAUR such as in cell migration and proliferation (PubMed:25168896).