Criticality and degeneracy in injury-induced changes in primary afferent excitability and the implications for neuropathic pain.

Abstract:

:Neuropathic pain remains notoriously difficult to treat despite numerous drug targets. Here, we offer a novel explanation for this intractability. Computer simulations predicted that qualitative changes in primary afferent excitability linked to neuropathic pain arise through a switch in spike initiation dynamics when molecular pathologies reach a tipping point (criticality), and that this tipping point can be reached via several different molecular pathologies (degeneracy). We experimentally tested these predictions by pharmacologically blocking native conductances and/or electrophysiologically inserting virtual conductances. Multiple different manipulations successfully reproduced or reversed neuropathic changes in primary afferents from naïve or nerve-injured rats, respectively, thus confirming the predicted criticality and its degenerate basis. Degeneracy means that several different molecular pathologies are individually sufficient to cause hyperexcitability, and because several such pathologies co-occur after nerve injury, that no single pathology is uniquely necessary. Consequently, single-target-drugs can be circumvented by maladaptive plasticity in any one of several ion channels. DOI: http://dx.doi.org/10.7554/eLife.02370.001.

journal_name

Elife

journal_title

eLife

authors

Ratté S,Zhu Y,Lee KY,Prescott SA

doi

10.7554/eLife.02370

subject

Has Abstract

pub_date

2014-04-01 00:00:00

pages

e02370

issn

2050-084X

journal_volume

3

pub_type

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