Abstract
Neuroleukin (NLK) is a multifunctional protein, involved in neuronal growth, glucose metabolism, cell motility, and differentiation. Expressed in the brain, it supports the growth of embryonic spinal, skeletal motor, and sensory neurons. We have previously demonstrated that NLK is up-regulated in the brain during Huntington’s disease (HD), a neurodegenerative disorder caused by the expansion of CAG trinucleotide repeats. In order to study the biological role of NLK, we have generated an inducible rat pheochromocytoma PC12 cell line in which the expression of NLK is selectively down-regulated by antisense strategy. We show here that the block of NLK commits PC12 cells to caspase-dependent apoptosis. This priming effect elicited by NLK inhibition is independent from the differentiation state of the neuronal cells. These results suggest a general protective role of NLK in the control of cell death in neuronal cells.
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