Biological activity of nerve growth factor precursor is dependent upon relative levels of its receptors

R. Masoudi, S. Ioannou M., D. Coughlin M., P. Pagadala, E. Neet K., O Clewes, SJ Allen, D Dawbarn, M. Fahnestock

Research output: Contribution to journalArticle (Academic Journal)

96 Citations (Scopus)

Abstract

Nerve growth factor (NGF) is produced as a precursor called pro-nerve growth factor (proNGF), which is secreted by many tissues and is the predominant form of NGF in the central nervous system. In Alzheimer disease brain, cholinergic neurons degenerate and can no longer transport NGF as efficiently, leading to an increase in untransported NGF in the target tissue. The protein that accumulates in the target tissue is proNGF, not the mature form. The role of this precursor is controversial, and both neurotrophic and apoptotic activities have been reported for recombinant proNGFs. Differences in the protein structures, protein expression systems, methods used for protein purification, and methods used for bioassay may affect the activity of these proteins. Here, we show that proNGF is neurotrophic regardless of mutations or tags, and no matter how it is purified or in which system it is expressed. However, although proNGF is neurotrophic under our assay conditions for primary sympathetic neurons and for pheochromocytoma (PC12) cells, it is apoptotic for unprimed PC12 cells when they are deprived of serum. The ratio of tropomyosin-related kinase A to p75 neurotrophin receptor is low in unprimed PC12 cells compared with primed PC12 cells and sympathetic neurons, altering the balance of proNGF-induced signaling to favor apoptosis. We conclude that the relative level of proNGF receptors determines whether this precursor exhibits neurotrophic or apoptotic activity
Original languageEnglish
Pages (from-to)18424 - 18433
Number of pages10
JournalJournal of Biological Chemistry
Volume284
Issue number27
Early online date23 Apr 2009
DOIs
Publication statusPublished - 3 Jul 2009

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    Masoudi, R., Ioannou M., S., Coughlin M., D., Pagadala, P., Neet K., E., Clewes, O., Allen, SJ., Dawbarn, D., & Fahnestock, M. (2009). Biological activity of nerve growth factor precursor is dependent upon relative levels of its receptors. Journal of Biological Chemistry, 284(27), 18424 - 18433. https://doi.org/10.1074/jbc.M109.007104