Effects of AF-DX116 and Other Muscarinic Receptor Antagonists on Orthostatic Hypotension in Autonomic Imbalanced (SART-Stressed) Rats
SART (specific alternation of rhythm in temperature)-stressed rats are an animal model of autonomic imbalance created by exposing animals to repeated cold stress. The SART-stressed rats have been shown to easily develop orthostatic hypotension (OH). In this study, effects of AF-DX116, a selective M2...
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| Format: | Article |
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Elsevier
2005-01-01
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| Series: | Journal of Pharmacological Sciences |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1347861319322509 |
| _version_ | 1811288214870163456 |
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| author | Taeko Hata Yoshinori Funakami Eiji Itoh |
| author_facet | Taeko Hata Yoshinori Funakami Eiji Itoh |
| author_sort | Taeko Hata |
| collection | DOAJ |
| description | SART (specific alternation of rhythm in temperature)-stressed rats are an animal model of autonomic imbalance created by exposing animals to repeated cold stress. The SART-stressed rats have been shown to easily develop orthostatic hypotension (OH). In this study, effects of AF-DX116, a selective M2 antagonist, and other muscarinic receptor antagonists on OH were investigated in SART-stressed and unstressed rats. Each anesthetized rat was canulated into the left common carotid artery, and blood pressure (BP) and heart rate were measured. Stimulation for postural change was initiated by head-up tilting. As the indices of OH, the maximum fall of BP, % reflex (recovery from maximum fall), and the area enclosed between the baseline and the recovery curve for BP (AUC) were used. Large AUC and small % reflex in SART-stressed rats were changed, becoming similar to those of the unstressed rats by AF-DX116 and methoctoramine. Atropine and methylatropine had similar effects to AF-DX116. However, the effects of methoctoramine, atropine, and methylatropine were less than that of AF-DX116. Pirenzepine was not effective. In conclusion, it was suggested in SART-stressed rats that OH was related to hyperactivity in the parasympathetic nerve and the M2 receptor played the major role in OH. Keywords:: SART (specific alternation of rhythm in temperature) stress, AF-DX116, orthostatic hypotension, muscarinic receptor, head-up tilt |
| first_indexed | 2024-04-13T03:33:10Z |
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| id | doaj.art-db9618bf8235468492585fb69fc12f90 |
| institution | Directory Open Access Journal |
| issn | 1347-8613 |
| language | English |
| last_indexed | 2024-04-13T03:33:10Z |
| publishDate | 2005-01-01 |
| publisher | Elsevier |
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| series | Journal of Pharmacological Sciences |
| spelling | doaj.art-db9618bf8235468492585fb69fc12f902022-12-22T03:04:25ZengElsevierJournal of Pharmacological Sciences1347-86132005-01-01973386392Effects of AF-DX116 and Other Muscarinic Receptor Antagonists on Orthostatic Hypotension in Autonomic Imbalanced (SART-Stressed) RatsTaeko Hata0Yoshinori Funakami1Eiji Itoh2Department of Pharmacology, Faculty of Pharmaceutical Sciences, Kinki University, 3-4-1 Kowakae, Higashi-Osaka 577-8502, Japan; Corresponding author. FAX: +81-6-6721-2353 E-mail: hata_t@phar.kindai.ac.jpDepartment of Pharmacology, Faculty of Pharmaceutical Sciences, Kinki University, 3-4-1 Kowakae, Higashi-Osaka 577-8502, JapanDepartment of Pharmacology, Faculty of Pharmaceutical Sciences, Kinki University, 3-4-1 Kowakae, Higashi-Osaka 577-8502, JapanSART (specific alternation of rhythm in temperature)-stressed rats are an animal model of autonomic imbalance created by exposing animals to repeated cold stress. The SART-stressed rats have been shown to easily develop orthostatic hypotension (OH). In this study, effects of AF-DX116, a selective M2 antagonist, and other muscarinic receptor antagonists on OH were investigated in SART-stressed and unstressed rats. Each anesthetized rat was canulated into the left common carotid artery, and blood pressure (BP) and heart rate were measured. Stimulation for postural change was initiated by head-up tilting. As the indices of OH, the maximum fall of BP, % reflex (recovery from maximum fall), and the area enclosed between the baseline and the recovery curve for BP (AUC) were used. Large AUC and small % reflex in SART-stressed rats were changed, becoming similar to those of the unstressed rats by AF-DX116 and methoctoramine. Atropine and methylatropine had similar effects to AF-DX116. However, the effects of methoctoramine, atropine, and methylatropine were less than that of AF-DX116. Pirenzepine was not effective. In conclusion, it was suggested in SART-stressed rats that OH was related to hyperactivity in the parasympathetic nerve and the M2 receptor played the major role in OH. Keywords:: SART (specific alternation of rhythm in temperature) stress, AF-DX116, orthostatic hypotension, muscarinic receptor, head-up tilthttp://www.sciencedirect.com/science/article/pii/S1347861319322509 |
| spellingShingle | Taeko Hata Yoshinori Funakami Eiji Itoh Effects of AF-DX116 and Other Muscarinic Receptor Antagonists on Orthostatic Hypotension in Autonomic Imbalanced (SART-Stressed) Rats Journal of Pharmacological Sciences |
| title | Effects of AF-DX116 and Other Muscarinic Receptor Antagonists on Orthostatic Hypotension in Autonomic Imbalanced (SART-Stressed) Rats |
| title_full | Effects of AF-DX116 and Other Muscarinic Receptor Antagonists on Orthostatic Hypotension in Autonomic Imbalanced (SART-Stressed) Rats |
| title_fullStr | Effects of AF-DX116 and Other Muscarinic Receptor Antagonists on Orthostatic Hypotension in Autonomic Imbalanced (SART-Stressed) Rats |
| title_full_unstemmed | Effects of AF-DX116 and Other Muscarinic Receptor Antagonists on Orthostatic Hypotension in Autonomic Imbalanced (SART-Stressed) Rats |
| title_short | Effects of AF-DX116 and Other Muscarinic Receptor Antagonists on Orthostatic Hypotension in Autonomic Imbalanced (SART-Stressed) Rats |
| title_sort | effects of af dx116 and other muscarinic receptor antagonists on orthostatic hypotension in autonomic imbalanced sart stressed rats |
| url | http://www.sciencedirect.com/science/article/pii/S1347861319322509 |
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