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Article

Intestinal mucosal injury induced by tryptase-activated protease-activated receptor 2 requires β-arrestin-2 in vitro

  • Authors:
    • Shun Li
    • Jianqiang Guan
    • Mian Ge
    • Pinjie Huang
    • Yiquan Lin
    • Xiaoliang Gan
  • View Affiliations / Copyright

    Affiliations: Department of Anesthesiology, The Third Affiliated Hospital, Sun Yat‑sen University, Guangzhou, Guangdong 510630, P.R. China, Department of Anesthesiology, Zhongshan Ophthalmic Center, Sun Yat‑sen University, Guangzhou, Guangdong 510060, P.R. China
  • Pages: 7181-7187
    |
    Published online on: September 14, 2015
       https://doi.org/10.3892/mmr.2015.4325
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Abstract

Tryptase exacerbates intestinal ischemia-reperfusion injury, however, the direct role of tryptase in intestinal mucosal injury and the underlying mechanism remains largely unknown. Protease-activated receptor 2 (PAR‑2), commonly activated by tryptase, interacts with various adaptor proteins, including β‑arrestin‑2. The present study aimed to determine whether tryptase is capable of inducing intestinal mucosal cell injury via PAR‑2 activation and to define the role of β‑arrestin‑2 in the process of injury. The IEC‑6 rat intestinal epithelial cell line was challenged by tryptase stimulation. Cell viability, lactate dehydrogenase (LDH) activity and apoptosis were analyzed to determine the severity of cell injury. Injury was also evaluated following treatments with specific PAR‑2 and extracellular signal‑related kinases (ERK) inhibitors, and knockdown of β‑arrestin‑2. PAR‑2, ERK and β‑arrestin‑2 protein expression levels were evaluated. Tryptase treatment (100 and 1,000 ng/ml) resulted in IEC‑6 cell injury, as demonstrated by significant reductions in cell viability, accompanied by concomitant increases in LDH activity and levels of cleaved caspase‑3 protein expression. Furthermore, tryptase treatment led to a marked increase in PAR‑2 and phosphorylated‑ERK expression, and exposure to specific PAR‑2 and ERK inhibitors eliminated the changes induced by tryptase. Knockdown of β‑arrestin‑2 blocked tryptase‑mediated cell injury, whereas tryptase exerted no influence on β‑arrestin‑2 expression in IEC‑6 cells. These data indicate that tryptase may directly damage IEC‑6 cells via PAR-2 and the downstream activation of ERK, and demonstrate that the signaling pathway requires β-arrestin-2.
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Copy and paste a formatted citation
Spandidos Publications style
Li S, Guan J, Ge M, Huang P, Lin Y and Gan X: Intestinal mucosal injury induced by tryptase-activated protease-activated receptor 2 requires β-arrestin-2 in vitro. Mol Med Rep 12: 7181-7187, 2015.
APA
Li, S., Guan, J., Ge, M., Huang, P., Lin, Y., & Gan, X. (2015). Intestinal mucosal injury induced by tryptase-activated protease-activated receptor 2 requires β-arrestin-2 in vitro. Molecular Medicine Reports, 12, 7181-7187. https://doi.org/10.3892/mmr.2015.4325
MLA
Li, S., Guan, J., Ge, M., Huang, P., Lin, Y., Gan, X."Intestinal mucosal injury induced by tryptase-activated protease-activated receptor 2 requires β-arrestin-2 in vitro". Molecular Medicine Reports 12.5 (2015): 7181-7187.
Chicago
Li, S., Guan, J., Ge, M., Huang, P., Lin, Y., Gan, X."Intestinal mucosal injury induced by tryptase-activated protease-activated receptor 2 requires β-arrestin-2 in vitro". Molecular Medicine Reports 12, no. 5 (2015): 7181-7187. https://doi.org/10.3892/mmr.2015.4325
Copy and paste a formatted citation
x
Spandidos Publications style
Li S, Guan J, Ge M, Huang P, Lin Y and Gan X: Intestinal mucosal injury induced by tryptase-activated protease-activated receptor 2 requires β-arrestin-2 in vitro. Mol Med Rep 12: 7181-7187, 2015.
APA
Li, S., Guan, J., Ge, M., Huang, P., Lin, Y., & Gan, X. (2015). Intestinal mucosal injury induced by tryptase-activated protease-activated receptor 2 requires β-arrestin-2 in vitro. Molecular Medicine Reports, 12, 7181-7187. https://doi.org/10.3892/mmr.2015.4325
MLA
Li, S., Guan, J., Ge, M., Huang, P., Lin, Y., Gan, X."Intestinal mucosal injury induced by tryptase-activated protease-activated receptor 2 requires β-arrestin-2 in vitro". Molecular Medicine Reports 12.5 (2015): 7181-7187.
Chicago
Li, S., Guan, J., Ge, M., Huang, P., Lin, Y., Gan, X."Intestinal mucosal injury induced by tryptase-activated protease-activated receptor 2 requires β-arrestin-2 in vitro". Molecular Medicine Reports 12, no. 5 (2015): 7181-7187. https://doi.org/10.3892/mmr.2015.4325
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