Abstract:
:Endotoxin-induced uveitis (EIU) is commonly used in animals to mimic ocular inflammation in humans. Although the peripheral aspects of EIU have been well studied, little is known of the central neural effects of anterior eye inflammation. EIU was induced in male rats by endotoxin or lipopolysaccharide (LPS, 1 mg/kg ip) given 2 or 7 days earlier. Neurons responsive to mechanical stimulation of the ocular surface were recorded under barbiturate anesthesia at the trigeminal subnucleus interpolaris/caudalis (Vi/Vc) transition and subnucleus caudalis/cervical cord (Vc/C1) junction, the main terminal regions for corneal nociceptors. Two days after LPS, Vc/C1 units had reduced responses to histamine, nicotine, and CO(2) gas applied to the ocular surface, whereas unit responses were increased 7 days after LPS. Those units with convergent cutaneous receptive fields at Vc/C1 were enlarged 7 days after LPS. Units at the Vi/Vc transition also had reduced responses to histamine and CO(2) 2 days after LPS but no enhancement was seen at 7 days. Tear volume evoked by CO(2) was reduced 2 days after LPS and returned toward control values by 7 days, whereas CO(2)-evoked eye blinks were normal at 2 days and increased 7 days after LPS. These results indicate that a single exposure to endotoxin causes long-term changes in the excitability of second-order neurons responsive to noxious ocular stimulation. The differential effects of EIU on tear volume and eye blink lend further support for the hypothesis that ocular-sensitive neurons at the Vi/Vc transition and Vc/C1 junction regions mediate different aspects of pain during intraocular inflammation.
journal_name
J Neurophysioljournal_title
Journal of neurophysiologyauthors
Bereiter DA,Okamoto K,Tashiro A,Hirata Hdoi
10.1152/jn.00616.2005subject
Has Abstractpub_date
2005-12-01 00:00:00pages
3815-25issue
6eissn
0022-3077issn
1522-1598pii
00616.2005journal_volume
94pub_type
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