Impact of Scratching on Itch and Sympathetic Reflexes Induced by Cowhage (Mucuna pruriens) and Histamine
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چکیده
منابع مشابه
Impact of scratching on itch and sympathetic reflexes induced by cowhage (Mucuna pruriens) and histamine.
Cowhage and histamine, both applied via spicules, were used to induce itch. The quality and intensity of the sensations, axon reflex flare, sympathetic skin vasoconstrictions and the interference of scratching with itch processing were studied. Axon reflex flare reactions were measured by laser Doppler imaging and reflex vasoconstrictions in the finger were recorded by laser Doppler flowmetry. ...
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BACKGROUND Histamine is the prototypical pruritogen used in experimental itch induction. However, in most chronic pruritic diseases, itch is not predominantly mediated by histamine. Cowhage-induced itch, on the other hand, seems more characteristic of itch occurring in chronic pruritic diseases. OBJECTIVES We tested the validity of cowhage as an itch-inducing agent by contrasting it with the ...
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The neuronal pathways for itch have been characterized mainly based on responses to histamine. Intracutaneous application of histamine produces intense itch and a large area of axon-reflexive vasodilation ("flare") around the application site. Both phenomena are thought to be mediated through neuronal activity in itch-specific, mechanoinsensitive C-fiber afferents (CMi). However, mechanical and...
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Previous PET and fMRI brain imaging studies targeting neural networks processing itch sensation have used histamine as the sole itch inducer. In contrast with histamine, cowhage-induced itch is mediated via proteinase activated receptors PAR2 and is transmitted through a separate spinothalamic pathway, therefore imaging the brain activation evoked by cowhage could provide further insight into c...
متن کاملGender differences in itch and pain-related sensations provoked by histamine, cowhage and capsaicin.
Cowhage, capsaicin and histamine, all applied via spicules, were used to induce itch and pain-related sensations in 15 male and 15 female subjects. Sensory qualities were assessed by questionnaire; intensities and time courses of the "itching" and "burning" sensation were measured alternately, but continuously on a VAS. In addition, axon reflexes were assessed. Only histamine and capsaicin prod...
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ژورنال
عنوان ژورنال: Acta Dermato Venereologica
سال: 2009
ISSN: 0001-5555
DOI: 10.2340/00015555-0624