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J Neurophysiol (May 1, 2003). 10.1152/jn.01139.2002
Submitted on Submitted 18 December 2002; accepted in final form 20 January 2003
1Department of Physiology and Experimental Pathophysiology, University of Erlangen/Nuremberg, D-91054 Erlangen, Germany; 2Department of Clinical Neurophysiology, University of Uppsala, S-75185 Uppsala, Sweden; 3Department of Basic Oral Sciences, Karolinska Institute, S-14104 Huddinge, Sweden; 4Department of Anesthesiology, Medical Faculty Mannheim, University of Heidelberg, 61087 Mannheim, Germany
Schmelz, M.,
R. Schmidt,
C. Weidner,
Marita Hilliges,
H. E. Torebjörk, and
H. O. Handwerker.
Chemical Response Pattern of Different Classes of C-Nociceptors
to Pruritogens and Algogens. J. Neurophysiol. 89: 2441-2448, 2003. Vasoneuroactive substances were
applied through intradermal microdialysis membranes and characterized
as itch- or pain-inducing in psychophysical experiments. Histamine
always provoked itching and rarely pain, capsaicin always pain but
never itching. Prostaglandin E2 (PGE2) led
preferentially to moderate itching. Serotonin, acetylcholine, and
bradykinin induced pain more often than itching. Subsequently the same
substances were used in microneurography experiments to characterize
the sensitivity profile of human cutaneous C-nociceptors. The responses
of 89 mechanoresponsive (CMH, polymodal nociceptors), 52 mechanoinsensitive, histamine-negative (CMiHis
), and 24 mechanoinsensitive, histamine-positive (CMiHis+) units were
compared. CMiHis+ units were most responsive to histamine and to PGE2 and less to serotonin, ACh, bradykinin, and
capsaicin. CMH units (polymodal nociceptors) and CMiHis
units showed significantly weaker responses to histamine,
PGE2, and acetylcholine. Capsaicin and bradykinin responses
were not significantly different in the two classes of
mechano-insensitive units. We conclude that CMiHis+ units
are "selective," but not "specific" for pruritogenic substances
and that the pruritic potency of a mediator increases with its ability
to activate CMiHis+ units but decreases with activation of
CMH and CMiHis
units.
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