PAR-1 upregulation by trimethyltin and lipopolysaccharide in cultured rat astrocytes

  • Authors:
    • Elena Pompili
    • Cinzia Fabrizi
    • Lorenzo Fumagalli
  • View Affiliations

  • Published online on: July 1, 2006     https://doi.org/10.3892/ijmm.18.1.33
  • Pages: 33-39
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Abstract

We have previously shown that various protease-activated receptor (PAR) isoforms, mainly PAR-1, are up-regulated in reactive astrocytes of rat hippocampus following i.p. administration of trimethyltin (TMT), a neurotoxicant which is known to cause neuronal death and reactive gliosis. In the present paper, we demonstrate that this PAR-1 up-regulation was also mimicked in primary cultures of neonatal rat cortex astrocytes after exposure (24 and 48 h) to TMT (10-100 μM). This result suggests that the PAR-1 increase we have observed in vivo may represent a direct effect of TMT on astrocytes rather than a consequence of a complex astrocytic reaction following neuronal death. Furthermore, an evident upregulation of PAR-1 in cultured primary astrocytes also occurred following exposure to lipopolysaccharide (LPS) (a well-known inductor of glial cell activation) whereas other neurotoxic agents (such as staurosporine, hydrogen peroxide and sodium azide), which are known to induce cell death, were unable to determine any PAR-1 variation. Similarly to astrocytes, both TMT and LPS induced an upregulation of PAR-1 in the rat astrocytoma cell line, C6, thus indicating that this phenomenon was independent from microglial cells eventually contaminating astrocyte primary cultures. Further-more, after exposure to TMT and LPS, the levels of tumor necrosis factor-α and interleukin-1β were also increased in astrocyte cultures, suggesting that the PAR-1 upregulation we have detected may be involved in glial inflammatory response rather than in cell death.

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July 2006
Volume 18 Issue 1

Print ISSN: 1107-3756
Online ISSN:1791-244X

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Spandidos Publications style
Pompili E, Fabrizi C and Fumagalli L: PAR-1 upregulation by trimethyltin and lipopolysaccharide in cultured rat astrocytes. Int J Mol Med 18: 33-39, 2006
APA
Pompili, E., Fabrizi, C., & Fumagalli, L. (2006). PAR-1 upregulation by trimethyltin and lipopolysaccharide in cultured rat astrocytes. International Journal of Molecular Medicine, 18, 33-39. https://doi.org/10.3892/ijmm.18.1.33
MLA
Pompili, E., Fabrizi, C., Fumagalli, L."PAR-1 upregulation by trimethyltin and lipopolysaccharide in cultured rat astrocytes". International Journal of Molecular Medicine 18.1 (2006): 33-39.
Chicago
Pompili, E., Fabrizi, C., Fumagalli, L."PAR-1 upregulation by trimethyltin and lipopolysaccharide in cultured rat astrocytes". International Journal of Molecular Medicine 18, no. 1 (2006): 33-39. https://doi.org/10.3892/ijmm.18.1.33