Tissue kallikrein (TK) is well known to take most of its biological functions through bradykinin receptors. In the present study, we found a novel signaling pathway mediated by TIC through epidermal growth factor receptor (EGFR) in human SH-SY5Y cells. We discovered that TIC facilitated the activation of EGFR, extracellular signal-regulated kinase (ERK) 1/2 and p38 cascade. Interestingly, not p38 but ERK1/2 phosphorylation was severely compromised in cells depleted of EGFR. Nevertheless, impairment of signaling of ERK1/2 seemed not to be restricted to EGFR phosphorylation. We also observed that TIC stimulation could induce SH-SY5Y cell proliferation, which was reduced by EGFR down-regulation or ERK1/2 inhibitor. Overall, our findings provided convincing evidence that TK could mediate cell proliferation via EGFR and ERK1/2 pathway in vitro. (c) 2014 Elsevier Inc. All rights reserved.
[1]Fudan Univ, State Key Lab Med Neurobiol, Dept Neurol, Huashan Hosp, Shanghai 200040, Peoples R China.
[2]Shanghai Univ Tradit Chinese Med, Yueyang Hosp Integrated Tradit Chinese & Western, Dept Neurol, Shanghai 200437, Peoples R China.
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