Biomaterial Database

Transient inhibition of responses to thermal stimuli of spinal sensory tract neurons in monkeys during sensitization by intradermal capsaicin. 1998

M P Dougherty, and D W Willis, and A F Lenz

Departments of Neurosurgery and Neuroscience, Johns Hopkins University School of Medicine, Meyer 5-109, 600 N. Wolfe Street, Baltimore, MD 21287-7509, USA Department of Anatomy and Neuroscience, University of Texas Medical Branch, 301 University Blvd, Galveston, Texas 77555-1069, USA.

A secondary zone of cutaneous hyperalgesia in humans is characterized by increased pain to mechanical stimuli. In contrast, the perception of heat stimuli delivered to a secondary zone of hyperalgesia in humans often shows a paradoxical decrease in magnitude. A number of studies have shown that the responses of spinal cord neurons to cutaneous mechanical stimuli after peripheral injury model well the mechanical hyperalgesia. However, the responses of dorsal horn neurons to thermal stimuli after peripheral injury have not been as carefully studied. The present study examined the effects of intradermal capsaicin on the responses of spinal sensory projection neurons to cutaneous mechanical and thermal stimuli. Our observations indicate that the responses of identified sensory projection neurons to heat are transiently reduced at the same time that responses of these cells to mechanical stimuli are increased. These results confirm a role for sensory projection cells in signaling the sensory discriminative aspects of pain in humans and underscore the emerging complexity of dorsal horn circuitry and sensory processing.

UI	MeSH Term	Description	Entries
D007271	Injections, Intradermal	The forcing into the skin of liquid medication, nutrient, or other fluid through a hollow needle, piercing the top skin layer.	Intradermal Injections,Injection, Intradermal,Intradermal Injection
D008252	Macaca fascicularis	A species of the genus MACACA which typically lives near the coast in tidal creeks and mangrove swamps primarily on the islands of the Malay peninsula.	Burmese Long-Tailed Macaque,Crab-Eating Monkey,Cynomolgus Monkey,M. f. aurea,M. fascicularis,Macaca fascicularis aurea,Monkey, Crab-Eating,Monkey, Cynomolgus,Crab-Eating Macaque,Burmese Long Tailed Macaque,Crab Eating Macaque,Crab Eating Monkey,Crab-Eating Macaques,Crab-Eating Monkeys,Cynomolgus Monkeys,Long-Tailed Macaque, Burmese,Macaque, Burmese Long-Tailed,Macaque, Crab-Eating,Monkey, Crab Eating
D008297	Male		Males
D009475	Neurons, Afferent	Neurons which conduct NERVE IMPULSES to the CENTRAL NERVOUS SYSTEM.	Afferent Neurons,Afferent Neuron,Neuron, Afferent
D010812	Physical Stimulation	Act of eliciting a response from a person or organism through physical contact.	Stimulation, Physical,Physical Stimulations,Stimulations, Physical
D002211	Capsaicin	An alkylamide found in CAPSICUM that acts at TRPV CATION CHANNELS.	8-Methyl-N-Vanillyl-6-Nonenamide,Antiphlogistine Rub A-535 Capsaicin,Axsain,Capsaicine,Capsicum Farmaya,Capsidol,Capsin,Capzasin,Gelcen,Katrum,NGX-4010,Zacin,Zostrix,8 Methyl N Vanillyl 6 Nonenamide,NGX 4010,NGX4010
D005260	Female		Females
D006358	Hot Temperature	Presence of warmth or heat or a temperature notably higher than an accustomed norm.	Heat,Hot Temperatures,Temperature, Hot,Temperatures, Hot
D006930	Hyperalgesia	An increased sensation of pain or discomfort produced by minimally noxious stimuli due to damage to soft tissue containing NOCICEPTORS or injury to a peripheral nerve.	Hyperalgesia, Tactile,Hyperalgesia, Thermal,Hyperalgia,Hyperalgia, Mechanical,Hyperalgia, Primary,Hyperalgia, Secondary,Allodynia,Allodynia, Mechanical,Allodynia, Tactile,Allodynia, Thermal,Hyperalgesia, Mechanical,Hyperalgesia, Primary,Hyperalgesia, Secondary,Hyperalgesic Sensations,Mechanical Allodynia,Mechanical Hyperalgesia,Tactile Allodynia,Thermal Allodynia,Allodynias,Hyperalgesias,Hyperalgesias, Thermal,Hyperalgesic Sensation,Mechanical Hyperalgia,Mechanical Hyperalgias,Primary Hyperalgia,Primary Hyperalgias,Secondary Hyperalgia,Secondary Hyperalgias,Sensation, Hyperalgesic,Sensations, Hyperalgesic,Thermal Hyperalgesia
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia