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Rami, A. et al.

A. Rami, M. Kim, J. Niquet, A. Langhagen,

Alterations in the expression of the anti-apoptotic factor HAX-1 upon seizures-induced hippocampal injury in the neonatal rat brain.

HS1-associated protein X1 (HAX-1) is a mitochondrial protein which interacts with a diverse group of molecules such as inflammatory cytokines; interleukin-1, hematopoietic lineage specific protein-1 and vimentin. It has been reported that HAX-1 may act as antiapoptotic protein in HeLa- and Jurkat cells after Fas-treatment, irradiation or serum deprivation. This underlines the evidence that HAX-1 might be involved in both receptor- and mitochondria-mediated apoptosis pathways. However, the role of HAX-1 in neuronal death induced by status epilepticus in the immature brain has not been reported. In this study, we performed a status epilepticus in rats and investigated the dynamic changes of HAX-1 expression, HtrA2 distribution and caspase-3 activation in the hippocampus. Western blot and immunohistochemistry analysis revealed that HAX-1 was expressed at very low levels in the hippocampus. Status epilepticus in the immature brain significantly induced increased cytosolic accumulation of HAX-1 in a biphasic manner, induced an upregulation of HtrA2 and enhanced caspase-3 activity in the selectively vulnerable hippocampal CA1-subfield. Taken together, these results suggested that HAX-1 is probably involved in the pathophysiology of cell death induced by epilepsy.[1]

References

Alterations in the expression of the anti-apoptotic factor HAX-1 upon seizures-induced hippocampal injury in the neonatal rat brain. Rami, A., Kim, M., Niquet, J., Langhagen, A. Neurochem. Res. (2012) [Pubmed]

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