Anatomic Evidence for Information Exchange between Primary Afferent Sensory Neurons Innervating the Anterior Eye Chamber and the Dura Mater in Rat

Investigative Ophthalmology & Visual Science
Haixia LiuFuqiang Xu

Abstract

Our previous studies suggested that mechanosensitive trigeminal ganglion (TG) nerve endings innervating the inner wall of the anterior eye chamber (IWAEC) might play a role in baroreception of the IOP. It has been reported that mechanosensitive TG nerve endings also innervate the dura mater. An acute IOP elevation evokes eye pain accompanied by an ipsilateral headache, suggesting that information exchange may occur between the primary afferent neurons (PANs) innervating the IWAEC and the dura mater. To verify the information exchange between PANs of the two locations, we investigated the anatomic connection between them. Non-trans-synaptic tracers, 1,1'-dilinoleyl-3,3,3',3'-tetramethylindo-carbocyanine, 4-chlorobenzenesulfonate (FAST Dil) and cholera toxin subunit-B with a 488-nm fluorescent tag (CTB-488), were applied to the dura of the anterior cranial fossa (DACF) and the anterior eye chamber (AEC) to label the PANs. A trans-synaptic tracer, GFP-expressing pseudorabies virus (PRV152), was injected into the AEC while FAST Dil was applied to the DACF to explore the connection between PANs. Fluorescent localization in the TG was studied with a confocal fluorescent microscope. Nine days after rats were treated with CTB-488 in th...Continue Reading

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