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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Role of hydrogen sulfide in the formalin-induced orofacial pain in rats

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Donatti, Alberto F. [1] ; Araujo, Rebeca M. [1] ; Soriano, Renato N. [1] ; Azevedo, Leopoldo U. [1] ; Leite-Panissi, Christie A. [1] ; Branco, Luiz G. S. [1]
Total Authors: 6
[1] Univ Sao Paulo, Dept Morphol Physiol & Basic Pathol, Dent Sch Ribeirao Preto, BR-14040904 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: European Journal of Pharmacology; v. 738, p. 49-56, SEP 5 2014.
Web of Science Citations: 13

Hydrogen sulfide (H2S) is a gasotransmitter synthesized in peripheral tissues by the enzyme cystathionine gamma-lyase (CSE). This gas has been documented to be involved in a wide variety of processes including inflammation and nociception. The aim of the present study was to investigate the role of the peripheral H2S pathway in nociceptive response to the orolacial formalin experimental model of pain. Orofacial pain was induced by subcutaneous injection of formalin (1.5%, 50 mu l) into the upper lip of rats, and the time spent rubbing the face was measured at 3-min intervals for 45 min. Formalin induced a marked biphasic pain (first phase: 0-3 min; second phase: 15-33 min). Pretreatment with H2S donor (Na2S; 90 mu mol/kg), CSE inhibitor (propargylglycine; 26.5 and 88.4 mu mol/kg), or a preferential blacker of T-type Ca2+ channels (mibefradil; 028 and 2.81 mu mol/kg) attenuated the second phase of face rubbing when injected locally as well as systemically. Pretreatment with a selective blocker of K-ATP(+) channels (glybenclamide; 2.81 mu mol/kg) suppressed the Na2S-mediated attenuation of the formalin-induced pain second phase. Taken together these results suggest that endogenously produced H2S plays a pronociceptive role probably via T-type Ca2+ channels, whereas exogenous H2S exerts antinociceptive effects mediated by K-ATP(+) channels. (C) 2014 Elsevier B.V. All rights reserved, (AU)

FAPESP's process: 12/01417-0 - Participation of hydrogen sulfide (H2S) on rostral ventrolateral medulla in the modulation of ventilatory responses to hypoxia
Grantee:Alberto Ferreira Donatti
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 12/13888-7 - Role of hydrogen sulfide in orofacial nociception in rats
Grantee:Rebeca Miranda de Araújo
Support type: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 13/12850-9 - Role of hydrogen sulfide during septic shock hypothermia
Grantee:Luiz Guilherme de Siqueira Branco
Support type: Regular Research Grants