Lack of evidence for ectopic sprouting of genetically labeled Aβ touch afferents in inflammatory and neuropathic trigeminal pain.

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2015-04-10

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Abstract

BACKGROUND: Mechanical and in particular tactile allodynia is a hallmark of chronic pain in which innocuous touch becomes painful. Previous cholera toxin B (CTB)-based neural tracing experiments and electrophysiology studies had suggested that aberrant axon sprouting from touch sensory afferents into pain-processing laminae after injury is a possible anatomical substrate underlying mechanical allodynia. This hypothesis was later challenged by experiments using intra-axonal labeling of A-fiber neurons, as well as single-neuron labeling of electrophysiologically identified sensory neurons. However, no studies have used genetically labeled neurons to examine this issue, and most studies were performed on spinal but not trigeminal sensory neurons which are the relevant neurons for orofacial pain, where allodynia oftentimes plays a dominant clinical role. FINDINGS: We recently discovered that parvalbumin::Cre (Pv::Cre) labels two types of Aβ touch neurons in trigeminal ganglion. Using a Pv::CreER driver and a Cre-dependent reporter mouse, we specifically labeled these Aβ trigeminal touch afferents by timed taxomifen injection prior to inflammation or infraorbital nerve injury (ION transection). We then examined the peripheral and central projections of labeled axons into the brainstem caudalis nucleus after injuries vs controls. We found no evidence for ectopic sprouting of Pv::CreER labeled trigeminal Aβ axons into the superficial trigeminal noci-receptive laminae. Furthermore, there was also no evidence for peripheral sprouting. CONCLUSIONS: CreER-based labeling prior to injury precluded the issue of phenotypic changes of neurons after injury. Our results suggest that touch allodynia in chronic orofacial pain is unlikely caused by ectopic sprouting of Aβ trigeminal afferents.

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10.1186/s12990-015-0017-2

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Zhang, Yi, Yong Chen, Wolfgang Liedtke and Fan Wang (2015). Lack of evidence for ectopic sprouting of genetically labeled Aβ touch afferents in inflammatory and neuropathic trigeminal pain. Mol Pain, 11. p. 18. 10.1186/s12990-015-0017-2 Retrieved from https://hdl.handle.net/10161/10438.

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Scholars@Duke

Chen

Yong Chen

Associate Professor in Neurology

Dr. Yong Chen is an Associate Professor of Neurology at the Duke University School of Medicine.  He is also affiliated with Duke Anesthesiology-Center for Translational Pain Medicine (CTPM) and Duke-Pathology.

The Chen lab mainly studies sensory neurobiology of pain and itch, with a focus on TRP ion channels and neural circuits. The main objective of our lab is to identify molecular and cellular mechanisms underlying chronic pain and chronic-disease associated itch, using a combination of animal behavioral, genetic, molecular and cellular, advanced imaging, viral, and optogenetic approaches.  There are three major research areas in the lab: craniofacial pain, arthritis pain and joint function, and systemic-disease associated itch.

Liedtke

Wolfgang Bernhard Liedtke

Adjunct Professor in the Department of Neurology

Research Interests in the Liedtke-Lab:

  • Pain/ nociception
  • Sensory transduction and -transmission
  • TRP ion channels
  • Water and salt equilibrium regulated by the central nervous system



Visit the lab's website, download papers and read Dr. Liedtke's CV here.
Wang

Fan Wang

Adjunct Professor in the Department of Neurobiology

My lab studies neural circuit basis of sensory perception. 
Specifically we are interested in determining neural circuits underlying (1) active touch sensation including tactile processing stream and motor control of touch sensors on the face; (2) pain sensation including both sensory-discriminative and affective aspects of pain; and (3) general anesthesia including the active pain-suppression process. We use a combination of genetic, viral, electrophysiology, and in vivo imaging (in free-moving animals) techniques to study these questions.


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