Abstract
Background: Clinical studies indicated that nitric oxide (NO) donors cause regional changes in cerebral blood flow (CBF), similar to those reported in spontaneous migraine. Systemic nitroglycerin (NTG), a NO donor, is a well-accepted experimental model of migraine. In this study we have examined the effects of NTG on the meningeal and cortical blood flow in rats. Methods: Regional blood flow was monitored in male Sprague-Dawley rats using laser Doppler flowmetry before and after NTG/saline injection over 150 minutes. The effect of pre-treatment with Nω-nitro-L-arginine ester (L-NAME) or 7-nitroindazole (7-NI) on NTG-induced changes on blood flow was also investigated. Results: In the dura NTG caused a biphasic response represented by an initial decrease in blood flow followed by a significant increase. At variance, in the cortex NTG caused only an increase in blood flow. Pre-treatment with either L-NAME or 7-NI prevented NTG-induced increase in blood flow in both districts, while only L-NAME also prevented NTG-induced decrease in dural blood flow. Conclusion: The present findings provide additional information on the timing of effects of NTG on blood flow at both the meningeal and cortical levels. These effects seem to be related to vasoregulatory mechanisms and/or metabolic activity in response to the synthesis of endogenous NO.
| Original language | English |
|---|---|
| Pages (from-to) | 190-198 |
| Number of pages | 9 |
| Journal | Cephalalgia |
| Volume | 31 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Feb 2011 |
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Keywords
- 7-NI
- Cerebral blood flow
- L-NAME
- nitroglycerin
ASJC Scopus subject areas
- Clinical Neurology
Cite this
Temporal profile of vascular changes induced by systemic nitroglycerin in the meningeal and cortical districts. / Greco, Rosaria; Meazza, Cristina; Mangione, Antonina Stefania; Allena, Marta; Bolla, Monica; Amantea, Diana; Mizoguchi, Hirocazu; Sandrini, Giorgio; Nappi, Giuseppe; Tassorelli, Cristina.
In: Cephalalgia, Vol. 31, No. 2, 02.2011, p. 190-198.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Temporal profile of vascular changes induced by systemic nitroglycerin in the meningeal and cortical districts
AU - Greco, Rosaria
AU - Meazza, Cristina
AU - Mangione, Antonina Stefania
AU - Allena, Marta
AU - Bolla, Monica
AU - Amantea, Diana
AU - Mizoguchi, Hirocazu
AU - Sandrini, Giorgio
AU - Nappi, Giuseppe
AU - Tassorelli, Cristina
PY - 2011/2
Y1 - 2011/2
N2 - Background: Clinical studies indicated that nitric oxide (NO) donors cause regional changes in cerebral blood flow (CBF), similar to those reported in spontaneous migraine. Systemic nitroglycerin (NTG), a NO donor, is a well-accepted experimental model of migraine. In this study we have examined the effects of NTG on the meningeal and cortical blood flow in rats. Methods: Regional blood flow was monitored in male Sprague-Dawley rats using laser Doppler flowmetry before and after NTG/saline injection over 150 minutes. The effect of pre-treatment with Nω-nitro-L-arginine ester (L-NAME) or 7-nitroindazole (7-NI) on NTG-induced changes on blood flow was also investigated. Results: In the dura NTG caused a biphasic response represented by an initial decrease in blood flow followed by a significant increase. At variance, in the cortex NTG caused only an increase in blood flow. Pre-treatment with either L-NAME or 7-NI prevented NTG-induced increase in blood flow in both districts, while only L-NAME also prevented NTG-induced decrease in dural blood flow. Conclusion: The present findings provide additional information on the timing of effects of NTG on blood flow at both the meningeal and cortical levels. These effects seem to be related to vasoregulatory mechanisms and/or metabolic activity in response to the synthesis of endogenous NO.
AB - Background: Clinical studies indicated that nitric oxide (NO) donors cause regional changes in cerebral blood flow (CBF), similar to those reported in spontaneous migraine. Systemic nitroglycerin (NTG), a NO donor, is a well-accepted experimental model of migraine. In this study we have examined the effects of NTG on the meningeal and cortical blood flow in rats. Methods: Regional blood flow was monitored in male Sprague-Dawley rats using laser Doppler flowmetry before and after NTG/saline injection over 150 minutes. The effect of pre-treatment with Nω-nitro-L-arginine ester (L-NAME) or 7-nitroindazole (7-NI) on NTG-induced changes on blood flow was also investigated. Results: In the dura NTG caused a biphasic response represented by an initial decrease in blood flow followed by a significant increase. At variance, in the cortex NTG caused only an increase in blood flow. Pre-treatment with either L-NAME or 7-NI prevented NTG-induced increase in blood flow in both districts, while only L-NAME also prevented NTG-induced decrease in dural blood flow. Conclusion: The present findings provide additional information on the timing of effects of NTG on blood flow at both the meningeal and cortical levels. These effects seem to be related to vasoregulatory mechanisms and/or metabolic activity in response to the synthesis of endogenous NO.
KW - 7-NI
KW - Cerebral blood flow
KW - L-NAME
KW - nitroglycerin
UR - http://www.scopus.com/inward/record.url?scp=79751480168&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79751480168&partnerID=8YFLogxK
U2 - 10.1177/0333102410379887
DO - 10.1177/0333102410379887
M3 - Article
C2 - 20693231
AN - SCOPUS:79751480168
VL - 31
SP - 190
EP - 198
JO - Cephalalgia
JF - Cephalalgia
SN - 0333-1024
IS - 2
ER -