PT  - JOURNAL ARTICLE
AU  - S Bevan
AU  - J Winter
TI  - Nerve growth factor (NGF) differentially regulates the chemosensitivity of adult rat cultured sensory neurons
AID  - 10.1523/JNEUROSCI.15-07-04918.1995
DP  - 1995 Jul 01
TA  - The Journal of Neuroscience
PG  - 4918--4926
VI  - 15
IP  - 7
4099  - http://www.jneurosci.org/content/15/7/4918.short
4100  - http://www.jneurosci.org/content/15/7/4918.full
SO  - J. Neurosci.1995 Jul 01; 15
AB  - We have studied the effects of NGF on the chemosensitivity of adult rat DRG neurons over a 1–2 week period in vitro, using voltage-clamp and radioactive ion flux methods. A sustained proton evoked current was reversibly lost in NGF-free medium after 1 week. Proton-evoked efflux of radioactive 86Rb+ ions was also depressed in NGF deprived cultures, although depolarization with 40 mM potassium still evoked a large 86Rb+ efflux. A similar reversible loss of capsaicin sensitivity was noted. The response to GABA and a second, transient proton evoked current were also regulated by NGF, but over a longer time course. In contrast, the sensitivity to ATP was not influenced by the presence or absence of NGF. These data show that NGF regulates some, but not all, chemosensitivities of DRG neurons and that loss of sensitivity occurs at different rates for different agonists. The precise co-regulation of the response to capsaicin and the sustained response to protons provides further evidence that protons activate capsaicin-operated ion channels.