Jul 31, 2004

Differential pH and capsaicin responses of Griffonia simplicifolia IB4 (IB4)-positive and IB4-negative small sensory neurons

Neuroscience
M LiuJohn V Priestley

Abstract

Protons play a key role in nociception caused by inflammation and ischaemia, but little is known about the relative sensitivities of different dorsal root ganglion (DRG) neurons. We have therefore examined the responses in vitro of rat DRG cells classified according to whether or not they bind Griffonia simplicifolia IB4 (IB4), a lectin which is widely used to distinguish between two major populations of small diameter neurons. Under voltage-clamp conditions, proton-activated inward currents were found in approximately 90% of small DRG neurons and showed one of three waveforms: transient, sustained or mixed. The majority of IB4-positive (IB4+) neurons (63%) gave rise to sustained inward currents that were sensitive to capsazepine. In contrast, the most prevalent waveform in small IB4-negative (IB4-) neurons (69%) was a mixed response containing transient and sustained components. The transient component was inhibited by amiloride whilst the sustained component showed a variable sensitivity to capsazepine. We also found that more IB4+ cells responded to capsaicin and, on average, gave rise to a larger magnitude of response than small IB4- neurons, consistent with their higher prevalence and greater amplitude of vanilloid recepto...Continue Reading

Mentioned in this Paper

CALCA gene
Ischemia
Calcitonin Gene-Related Peptide
CALCA wt Allele
Immunoreactivity
SLC25A29 gene
Extracellular
Calcium
Caenorhabditis elegans
Protoplasm

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