Abstract：
BACKGROUND:During congestive heart failure, desensitization of beta-adrenoceptors is related to a lower adrenergic responsiveness in the heart; little is known about alpha 1-adrenoceptors in the vasculature under this condition. We evaluated alpha 1D-adrenoceptor response in aorta and carotid arteries in a model of congestive heart failure (CHF) post-myocardial infarction. METHODS:Noradrenaline-elicited contraction was determined in endothelium-denuded arterial rings from young (10-week-old) Wistar rats in the absence and presence of the alpha 1D-adrenoceptor antagonist BMY 7378 (8-(2-(4-(2-methoxyphenyl)-1-piperazinyl) ethyl)-8-azaspiro(4,5)decane-7,9-dione dihydrochloride) in sham-operated rats and in rats that developed CHF 4 weeks or 7 months after myocardial infarction. RESULTS:In the thoracic aorta, BMY 7378 displaced noradrenaline effect to the right with pA2 values of: sham, 8.58 +/- 0.12; CHF, 8.36 +/- 0.13, and sham, 8.56 +/- 0.10; CHF, 7.99 +/- 0.13 at 4 weeks and 7 months after myocardial infarction, respectively. While in carotid arteries, the pA2 values were: sham, 8.43 +/- 0.19; CHF, 8.81 +/- 0.19, and sham, 8.35 +/- 0.18; CHF, 8.29 +/- 0.08 at 4 weeks and 7 months after myocardial infarction, respectively. When adult (7-month-old) rats were subjected to myocardial infarction, CHF was not installed and pA2 values were similar and high in both sham and infarcted rats. CONCLUSIONS:These results indicate that alpha 1D-adrenoceptors remained as the main receptors involved in contraction in aorta and carotid arteries, irrespective of CHF duration.
journal_name
Arch Med Resjournal_title
Archives of medical researchauthors
Martínez L,Carmona L,Villalobos-Molina Rdoi
10.1016/s0188-0128(99)00033-0subject
Has Abstractpub_date
1999-07-01 00:00:00pages
290-7issue
4eissn
0188-4409issn
1873-5487pii
S0188012899000330journal_volume
30pub_type
杂志文章abstract：BACKGROUND AND AIMS:To compare the prevalence of lactose malabsorption (LM) in children by analyzing hydrogen content in expired air vs. the inclusion of methane excretion. METHODS:A total of 138 children (4-17 years old) attending different boarding schools in Mexico were included in this study. To measure H₂ and CH₄...
journal_title：Archives of medical research
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abstract：:Reports on simultaneous central and peripheral nervous system involvement in a patient with brucellosis are very rare. We report of one young female patient with a long history of consumption of non-pasteurized dairy products in which clinical and laboratory findings confirmed the existence of an active brucellosis wi...
journal_title：Archives of medical research
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journal_title：Archives of medical research
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更新日期：1993-07-01 00:00:00
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journal_title：Archives of medical research
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doi：
更新日期：1995-01-01 00:00:00
abstract：BACKGROUND:Afternoon nap sleep was studied in 32 young male medical students who take customary naps to replace loss in nocturnal sleep. METHODS:From 16 subjects, a group called dreamers was formed, and the other 16 individuals were grouped as non-dreamers. Polygraphic recordings lasting 30 min were done at a fixed ti...
journal_title：Archives of medical research
pub_type： 临床试验,杂志文章
doi：
更新日期：1998-07-01 00:00:00
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abstract：:During the late 1940s, Alfred Jost demonstrated that mammalian sex differentiation begins in fetal testis, producing two factors necessary for the establishment of phenotypic males. Castrated embryos prior to testis differentiation led to phenotypic female differentiation. Jost proposed the existence of a testis-deter...
journal_title：Archives of medical research
pub_type： 杂志文章,评审
doi：10.1016/s0188-4409(01)00317-4
更新日期：2001-11-01 00:00:00
abstract：BACKGROUND AND AIMS:It remains unclear whether U50488H (a selective kappa-opioid receptor agonist) produces anti-apoptotic effect during ischemia and reperfusion (I/R). Therefore, the effect of U50488H on myocardial apoptosis was investigated in the present study. METHODS:Rats were subjected to 45min coronary artery o...
journal_title：Archives of medical research
pub_type： 杂志文章
doi：10.1016/j.arcmed.2009.04.009
更新日期：2009-05-01 00:00:00
