Abstract:
:Painful mechanical stimuli activate multiple peripheral sensory afferent subtypes simultaneously, including nociceptors and low-threshold mechanoreceptors (LTMRs). Using an optogenetic approach, we demonstrate that LTMRs do not solely serve as touch receptors but also play an important role in acute pain signaling. We show that selective activation of neuropeptide Y receptor-2-expressing (Npy2r) myelinated A-fiber nociceptors evokes abnormally exacerbated pain, which is alleviated by concurrent activation of LTMRs in a frequency-dependent manner. We further show that spatial summation of single action potentials from multiple NPY2R-positive afferents is sufficient to trigger nocifensive paw withdrawal, but additional simultaneous sensory input from LTMRs is required for normal well-coordinated execution of this reflex. Thus, our results show that combinatorial coding of noxious and tactile sensory input is required for normal acute mechanical pain signaling. Additionally, we established a causal link between precisely defined neural activity in functionally identified sensory neuron subpopulations and nocifensive behavior and pain.
journal_name
Neuronjournal_title
Neuronauthors
Arcourt A,Gorham L,Dhandapani R,Prato V,Taberner FJ,Wende H,Gangadharan V,Birchmeier C,Heppenstall PA,Lechner SGdoi
10.1016/j.neuron.2016.11.027subject
Has Abstractpub_date
2017-01-04 00:00:00pages
179-193issue
1eissn
0896-6273issn
1097-4199pii
S0896-6273(16)30865-0journal_volume
93pub_type
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