Previous findings have shown that saffron (Crocus sativus L.) extract and its active constituents produce antinociceptive effects in the rat models of orofacial pain. In the present study, the central H2 histaminergic and alpha-2 adrenergic receptors involvement in crocetin-induced antinociception in orofacial formalin pain in rats was evaluated.The guide cannula was implant...

Objective(s): There are many reports about the role of rostral ventromedial medulla (RVM) in modulating stress-induced analgesia (SIA). In the previous study we demonstrated that temporal inactivation of RVM by lidocaine potentiated stress-induced analgesia. In this study, we investigated the effect of permanent lesion of the RVM on SIA by using formalin test as a model of acute inflammatory pa...

objective(s):based on the previous reports, silymarin can suppress nitric oxide, prostaglandin e2 (pge2), leukotrienes, cytokines production, and neutrophils infiltration. regarding the fact that inflammation plays an important role in neuropathic and formalin-induced pain, it was assumed that silymarin could reduce pain. the present study investigates the analgesic effects of silymarin in chem...

objective(s) celecoxib acts through both cox-2-dependent and -independent pathways. according to the paradoxical effect of no on the inflammatory and nociceptive signal processing, the present study designed to evaluate the probable contribution of no in the analgesic and anti-inflammatory properties of celecoxib. materials and methods different intensities of inflammatory pain were induced by ...

orexin, mainly produced by orexin-expressing neurons in the lateral hypothalamus (lh), plays an important role in pain modulation. moreover, it is shown that the nucleus accumbens (nac) is one of the important areas involved in this modulation. orexin-1 (ox1) and orexin-2 (ox2) receptors are densely distributed in the nac. the study investigated the involvement of ox1 receptors in the nac on an...

introduction: this study aimed to examine the effects of induced inflammatory tooth pain on anxiety level in adult male rats. methods: the mandibular incisors of 56 adult male rats were cut off and prefabricated crowns were fixed on the teeth. formalin and capsaicin were injected intradentally to induce inflammatory tooth pain. diazepam treated group received diazepam 30 minutes before intraden...

introduction: pain as a complex process in central nervous system (cns) has been studied by many researchers. pain is controlled by several cns pathways, one of the most important of which, is the descending noradrenergic system. this system begins from locus coeruleus (lc) nucleus in pons and ends in the spinal cord. in this research, the effect of pain induced by formalin was studied. methods...

Objective(s):Based on the previous reports, silymarin can suppress nitric oxide, prostaglandin E2 (PGE2), leukotrienes, cytokines production, and neutrophils infiltration. Regarding the fact that inflammation plays an important role in neuropathic and formalin-induced pain, it was assumed that silymarin could reduce pain. The present study investigates the analgesic effects of silymarin in chem...

Introduction: 17β-estradiol modulates nociception by binding to estrogenic receptors and also by allosteric interaction with other membrane-bound receptors like glutamate and GABAA receptors. Beside its autonomic functions, paragigantocellularis lateralis (LPGi) nucleus is also involved in pain modulation. The aim of the current study was to investigate the role of the intracellular estrogen...

Widely used, the formalin test is a tonic model of continuous pain resulting from formalin-induced tissue injury. It is a useful model, particularly for the screening of novel compounds, since it encompasses inflammatory, neurogenic, and central mechanisms of nociception [5,6]. Reports can vary widely with regard to concentration of formalin (itself a 37% dilute solution of formaldehyde) as wel...