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A comparison between antisense P75NTR oligonucleotides and neurotrophic factors in promoting the survival of postnatal sensory neurons in vitro

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Summary

The 75-kDa low-affinity neurotrophin receptor (p75NTR) has been shown in previous reports to mediate neuronal cell death in vitro and in vivo under certain circumstances. Antisense oligonucleotides directed against p75NTR promote the survival of nerve growth factor-deprived dorsal root ganglia sensory neurons in vitro (Barrett, G.; Bartlett, P., Proc. Natl. Acad. Sci. USA 91:6501–6505; 1994) and axotomized dorsal root ganglia sensory neurons in vivo (Cheema, S. S.; Barrett, G. L.; Bartlett, P. F., J. Neurosci. Res. 46:239–245; 1996). In this study we compared the neuroprotective effects of antisense p75NTR oligonucleotides with two neurotrophic factors, namely nerve growth factor (NGF) and leukemia inhibitory factor, on cultured sensory neurons derived from postnatal day 7 and 14 rat dorsal root ganglia. After 3 d in culture, treatment with the neurotrophic factors had significant survival effects on sensory neuron cultures compared to treatment with basal medium (control). However, after 6 and 9 d in culture these rescue effects were not apparent. In contrast, antisense p75NTR oligonucleotides rescued significantly higher numbers of dorsal root ganglia sensory neurons after 6 and 9 d in culture than treatment with neurotrophic factors, sense oligonucleotides, and basal medium. Furthermore, antisense p75NTR oligonucleotides rescued trkA-, B-, and C-expressing neurons, while NGF and leukemia inhibitory factor targeted primarily the trkA-positive neurons. These findings suggest that antisense-based strategies that inhibit gene expression of cytotoxic molecules are more efficient at preventing postnatal sensory neuronal death in vitro than treatment with individual neurotrophic factors.

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  1. Department of Anatomy, Monash University, Wellington Road, 3800, Clayton, Victoria, Australia

    K. S. Lowry & S. S. Cheema

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  1. K. S. Lowry
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  2. S. S. Cheema
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Correspondence to S. S. Cheema.

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Lowry, K.S., Cheema, S.S. A comparison between antisense P75NTR oligonucleotides and neurotrophic factors in promoting the survival of postnatal sensory neurons in vitro. In Vitro Cell.Dev.Biol.-Animal 36, 520–526 (2000). https://doi.org/10.1290/1071-2690(2000)036<0520:ACBAPN>2.0.CO;2

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  • DOI: https://doi.org/10.1290/1071-2690(2000)036<0520:ACBAPN>2.0.CO;2

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