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. 1992 Jun;106(2):409–415. doi: 10.1111/j.1476-5381.1992.tb14348.x

CP-93,129, sumatriptan, dihydroergotamine block c-fos expression within rat trigeminal nucleus caudalis caused by chemical stimulation of the meninges.

K Nozaki 1, M A Moskowitz 1, P Boccalini 1
PMCID: PMC1907519  PMID: 1327382

Abstract

1. The effects of intravenously administered 5-HT1B receptor agonists were examined on c-fos like immunoreactivity, an indicator of neuronal activation, within the brain stem. C-fos was induced by injecting an algesic, vasoconstrictor substance (0.3 ml of autologous blood) or a pro-inflammatory molecule, carrageenin (1 mg in 0.1 ml saline) into the cisterna magna of pentobarbitone-anaesthetized Sprague-Dawley rats and was visualized in serial sections (50 micrometers) by use of a polyclonal antiserum. 2. As previously reported, the injection of blood caused significant labelling within laminae I, IIo of the trigeminal nucleus caudalis, a major nociceptive brain stem nucleus, as well as within nucleus of the solitary tract and area postrema. A similar pattern of expression with fewer cells per section was detected after carrageenin instillation. The number of expressing cells was reduced by 54% in trigeminal nucleus caudalis but not within the nucleus of the solitary tract or area postrema when blood was injected in adult rats neonatal capsaicin treatment. 3. Pretreatment with 5-HT1 agonists with some selectivity for the 5-HT1B receptor, CP-93,129 (460 nmol kg-1 x 2, i.v.), sumatriptan (720 nmol kg-1 x 2, i.v.) or dihydroergotamine (86 nmol kg-1 x 2, i.v.) reduced positive cells by 39%, 31%, and 33% respectively in trigeminal nucleus caudalis but not in nucleus of the solitary tract or area postrema after blood instillation. Pretreatment with the analgesic morphine (15 mumol kg-1, s.c.) also decreased the number of positive cells by 63% in trigeminal nucleus caudalis. 4. CP-93,129 (460 nmol kg-1 x 2, i.v.) reduced the number of c-fos labelled cells by 47% within lamina I, IIo after carrageenin instillation. 5. Drug-induced blockade appeared to be tissue-dependent. Pretreatment with sumatriptan (720 nmol kg-1 x 2, i.v.) did not block c-fos expression in trigeminal nucleus caudalis following formalin application to the nasal mucosa.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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