Effects of neonatal inflammation on descending modulation from the rostroventromedial medulla.

Brain Research Bulletin
Yi-Hong ZhangM Ennis

Abstract

Cutaneous tissue inflammation during the first postnatal week is known to alter long-term development of spinal cord nociceptive circuitry and to alter behavioral responses to noxious stimuli in adult animals. The impact of neonatal inflammation on descending projections arising from supraspinal sites that modulate spinal nociceptive processing is unknown. In the present study, we investigated if altered behavioral responses to pain in adult animals after neonatal inflammation are associated with changes in descending modulation of nocifensive responses elicited from the rostroventromedial medulla (RVM) in lightly anesthetized rats. Compared to handled control animals, hindpaw injection of 0.25% carrageenan (CG) at postnatal day 3 produced adult basal hypoalgesia and increased hyperalgesia 24 h after reinflammation with Complete Freund's Adjuvant (CFA) in awake animals. These effects were specific to the neonatally treated hindpaw, partially replicating previous findings, but were absent in lightly anesthetized animals. However, focal electrical stimulation of the RVM in lightly anesthetized CG treated animals produced significantly greater descending inhibition of nocifensive responses to noxious thermal stimuli applied to the...Continue Reading

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Citations

Jul 27, 2012·Pediatric Surgery International·P BozzaS Picardo
Aug 16, 2016·Current Opinion in Behavioral Sciences·Nicole C Victoria, Anne Z Murphy
Aug 27, 2013·Clinics in Perinatology·Suellen M Walker
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Aug 11, 2019·Journal of Neural Transmission·Chelsie L Brewer, Mark L Baccei
Mar 3, 2020·Frontiers in Pediatrics·Morika D Williams, B Duncan X Lascelles

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