Abstract:
:This investigation was designed to study the role of muscarinic receptor subtypes in the cardiovascular responses elicited by microinjection of cholinergic agonists in the intermediate portion of the NTS, the VLPA and VLDA areas and the IML of the spinal cord. Microinjections of L-glutamate (1.77 nmol in 20-50 nl in 0.9% sodium chloride solution) were used to identify these areas. Bilateral microinjections (0.02-2 nmol/site) of a potent M2 muscarinic receptor agonist, CD, but not those of a relatively selective M1 receptor agonist (McNA343; 3 nmol/site), into the intermediate portion of NTS and the VLDA induced depressor and bradycardic responses. In the VLPA these agonists elicited pressor and tachycardic effects while in the IML at T1-T3 only increase in HR was observed. Previous microinjections of a selective competitive M2 receptor antagonist (AFDX-116; 0.8-1.6 nmol/site), but not those of a potent selective M1 receptor antagonist (PZ; 1.5-2.0 nmol/site), into these areas blocked the effects of CD. These results indicate that the muscarinic receptors of M2 type may play a part in the regulation of cardiovascular function in the above-mentioned cardiovascular areas in a yet unidentified manner.
journal_name
Prog Brain Resjournal_title
Progress in brain researchauthors
Sapru HNdoi
10.1016/s0079-6123(08)62007-5subject
Has Abstractpub_date
1989-01-01 00:00:00pages
171-9eissn
0079-6123issn
1875-7855pii
S0079-6123(08)62007-5journal_volume
81pub_type
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journal_title:Progress in brain research
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journal_title:Progress in brain research
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journal_title:Progress in brain research
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更新日期:2007-01-01 00:00:00
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journal_title:Progress in brain research
pub_type: 杂志文章
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journal_title:Progress in brain research
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更新日期:2005-01-01 00:00:00
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pub_type: 杂志文章,评审
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更新日期:2005-01-01 00:00:00
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journal_title:Progress in brain research
pub_type: 杂志文章,评审
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更新日期:2001-01-01 00:00:00
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journal_title:Progress in brain research
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