Abstract：
:Aging plays an important role in increased vulnerability to atrial fibrillation (AF). Mediated by activity at the muscarinic type 2 receptor (M2R), the parasympathetic nerve contributes to the onset of AF. The purpose of this study was to investigate whether aging changes the distribution of M2R in the atrial myocardium and to determine the impact of these changes on AF vulnerability. Expression of M2R in the atrial myocardium was evaluated by immunostaining and Western blot in three groups-young (3 months old), mature (8 months old) and senescent (36-48 months old) rabbits. AF inducibility was recorded with and without cervical vagal stimulation (VS) in vivo in all groups. AF inducibility, the atrial effective refractory period (AERP) and the monophasic action potential (MAP) were recorded in an additional seven senescent rabbits before and after topical administration of tropicamide. The results showed that the density of M2R in the left atrial free wall (LAFW) was significantly higher than that in other parts of the atria. The left atrial appendage had a higher level of M2R expression than the right atrium. The M2R density of the epicardial side was greater than that of endocardial side in both atria. The senescent group had a significant increase in M2R expression in the LAFW relative to the mature group. AF inducibility was also higher in the senescent group than in the other two groups. After tropicamide administration in the senescent rabbits, AF inducibility decreased significantly, the VS-induced decrease in AERP and MAP duration at 90% repolarization (MAPD90) of LAFW was attenuated, and the dispersion of the AERP and MAPD90 increase was attenuated. In conclusion, our results suggested that there is spatial heterogeneity in the M2R distribution in the atria of the rabbit. The density of M2R in the LAFW increased with the aging of rabbits. This change in M2R enhanced the heterogeneity of the M2R distribution and contributed to the change in age-related AF vulnerability.
journal_name
Exp Gerontoljournal_title
Experimental gerontologyauthors
Yang YH,Zheng QS,Li J,Shang FJ,Liu T,Wang HT,Liu XT,Liu Ldoi
10.1016/j.exger.2009.06.002subject
Has Abstractpub_date
2009-09-01 00:00:00pages
572-8issue
9eissn
0531-5565issn
1873-6815pii
S0531-5565(09)00115-6journal_volume
44pub_type
杂志文章abstract：:Life history theory proposes that menopause is either an epiphenomenon or an adaptation. The most recent adaptive hypothesis proposes that menopause in humans has evolved because of conflict between reproducing generations (RCH). Overlapping reproduction between generations may impose fitness costs to older and younge...
journal_title：Experimental gerontology
pub_type： 杂志文章
doi：10.1016/j.exger.2013.02.001
更新日期：2013-04-01 00:00:00
abstract：BACKGROUND:An intermission in the training routine, in which older adults refrain from regular structured exercise, may have deleterious effects on muscle performance and bioelectric phase angle (PhA), which is a predictive marker for cellular integrity. PURPOSE:To determine the effects of a 2-week detraining period o...
journal_title：Experimental gerontology
pub_type： 杂志文章
doi：10.1016/j.exger.2020.111175
更新日期：2021-02-01 00:00:00
abstract：:Based on evidence that human diploid fibroblasts (HDF) from the Werner syndrome (WS) of premature aging might overexpress an inhibitor of DNA synthesis (IDS), we prepared a eukaryotic cDNA expression library from WS mRNA and tested it for IDS activity in a transient assay. Two of six WS cDNA pools tested gave IDS acti...
journal_title：Experimental gerontology
pub_type： 杂志文章
doi：10.1016/0531-5565(89)90052-1
更新日期：1989-01-01 00:00:00
abstract：:The binding of advanced glycation endproducts (AGEs) to their receptors is known to cause changes in cell function during normal ageing and is implicated in the pathogenesis of cardiovascular disease. In this study, expression of the AGE-receptor 3 (AGE-R3) and the receptor for AGEs (RAGE) was compared on the mRNA and...
journal_title：Experimental gerontology
pub_type： 杂志文章
doi：10.1016/j.exger.2003.12.006
更新日期：2004-03-01 00:00:00
abstract：:The purpose of this study was to examine the effect of a mentally fatiguing task on postural responses to unexpected backward perturbations in sixteen young and sixteen older women. Postural responses were characterized by center of pressure (COP) displacement, corrective COP peak velocity, and electromyography (EMG) ...
journal_title：Experimental gerontology
pub_type： 杂志文章
doi：10.1016/j.exger.2020.110840
更新日期：2020-04-01 00:00:00
abstract：:Over the last 40 years it has become clear that telomeres, the end of the chromosomes, and the enzyme telomerase reverse transcriptase (TERT), which is required to counteract their shortening, play a pivotal role in senescence and aging. However, over the last years several studies demonstrated that TERT belongs to th...
journal_title：Experimental gerontology
pub_type： 杂志文章,评审
doi：10.1016/j.exger.2014.02.011
更新日期：2014-08-01 00:00:00
abstract：:Physical activity has been associated with alterations in telomere length, a potential indicator of biological aging, but several inconsistencies exist. Our aim was to investigate the associations between physical activity in midlife and leukocyte telomere length (LTL) measured in old age in the Helsinki Businessmen S...
journal_title：Experimental gerontology
pub_type： 杂志文章
doi：10.1016/j.exger.2012.02.003
更新日期：2013-01-01 00:00:00
abstract：:Aromatase inhibitors have become the standard of care for the adjuvant treatment of postmenopausal, hormone-sensitive breast cancer. Meanwhile, more and more breast cancer patients who are treated with aromatase inhibitors as adjuvant therapies often experience arthralgias and musculoskeletal aching, in some cases, ha...
journal_title：Experimental gerontology
pub_type： 杂志文章
doi：10.1016/j.exger.2009.03.003
更新日期：2009-06-01 00:00:00
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journal_title：Experimental gerontology
pub_type： 杂志文章
doi：10.1016/0531-5565(88)90020-4
更新日期：1988-01-01 00:00:00
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journal_title：Experimental gerontology
pub_type： 杂志文章
doi：10.1016/0531-5565(83)90040-2
更新日期：1983-01-01 00:00:00
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journal_title：Experimental gerontology
pub_type： 杂志文章,meta分析
doi：10.1016/j.exger.2019.02.020
更新日期：2019-06-01 00:00:00
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journal_title：Experimental gerontology
pub_type： 杂志文章
doi：10.1016/j.exger.2006.09.003
更新日期：2007-03-01 00:00:00
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journal_title：Experimental gerontology
pub_type： 杂志文章
doi：10.1016/j.exger.2019.110663
更新日期：2019-10-01 00:00:00
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journal_title：Experimental gerontology
pub_type： 杂志文章
doi：10.1016/j.exger.2005.09.013
更新日期：2006-02-01 00:00:00
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journal_title：Experimental gerontology
pub_type： 杂志文章
doi：10.1016/j.exger.2004.12.002
更新日期：2005-03-01 00:00:00
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journal_title：Experimental gerontology
pub_type： 杂志文章,评审
doi：10.1016/s0531-5565(96)00060-5
更新日期：1997-01-01 00:00:00
abstract：:Aging is known to be associated with a decrease of learning and memory. Little is known on the specificity of this process. In Drosophila, two forms of consolidated memory have been observed. Anesthesia-resistant memory (ARM) is formed after one or several consecutive training sessions whereas long-term memory (LTM) i...
journal_title：Experimental gerontology
pub_type： 杂志文章
doi：10.1016/j.exger.2006.06.004
更新日期：2007-01-01 00:00:00
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journal_title：Experimental gerontology
pub_type： 杂志文章
doi：10.1016/j.exger.2017.06.002
更新日期：2017-10-01 00:00:00
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journal_title：Experimental gerontology
pub_type： 杂志文章
doi：10.1016/0531-5565(86)90058-6
更新日期：1986-01-01 00:00:00
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journal_title：Experimental gerontology
pub_type： 杂志文章,评审
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更新日期：2020-03-01 00:00:00
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journal_title：Experimental gerontology
pub_type： 杂志文章
doi：10.1016/j.exger.2016.10.005
更新日期：2016-12-01 00:00:00
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journal_title：Experimental gerontology
pub_type： 杂志文章
doi：10.1016/j.exger.2010.10.004
更新日期：2011-01-01 00:00:00
abstract：:A growing body of research in elderly populations suggests that the early phase of an explosive muscle contraction (i.e., ≤200 ms) may be more functionally relevant than peak values. However, age-related variation in early phase explosive strength has never been investigated across the full-adult life span. This cross...
journal_title：Experimental gerontology
pub_type： 杂志文章
doi：10.1016/j.exger.2018.06.021
更新日期：2018-09-01 00:00:00
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journal_title：Experimental gerontology
pub_type： 杂志文章
doi：10.1016/j.exger.2017.01.025
更新日期：2017-04-01 00:00:00
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journal_title：Experimental gerontology
pub_type： 杂志文章
doi：10.1016/j.exger.2013.12.012
更新日期：2014-03-01 00:00:00
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journal_title：Experimental gerontology
pub_type： 杂志文章
doi：10.1016/j.exger.2020.111020
更新日期：2020-09-01 00:00:00
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journal_title：Experimental gerontology
pub_type： 杂志文章
doi：10.1016/0531-5565(85)90038-5
更新日期：1985-01-01 00:00:00
abstract：:With many caveats to the traditional vertebrate species pertaining to biogerontology investigations, it has been suggested that a most informative model is the one which: 1) examines closely related species, or various members of the same species with naturally occurring lifespan variation, 2) already has adequate med...
journal_title：Experimental gerontology
pub_type： 杂志文章,评审
doi：10.1016/j.exger.2015.08.008
更新日期：2015-11-01 00:00:00
abstract：:We have developed a simian virus 40 (SV40) T-antigen immortalized human cell line, 1MR90-D305.2H4 (IDH4), in which the expression of T-antigen is controlled by the mouse mammary tumor virus (MMTV) promoter and thus regulated by steroids such as dexamethasone. Studies on the regulation of proliferation by T-antigen led...
journal_title：Experimental gerontology
pub_type： 杂志文章
doi：10.1016/0531-5565(92)90003-i
更新日期：1992-09-01 00:00:00
abstract：:To test if the adrenocortical axis of the rat loses sensitivity to negative feedback control during aging, we examined corticosterone secretion under basal, stressed and post-stress conditions in young and in aged Fisher male rats. We find no age-related change in the speed or magnitude of the stress response or in th...
journal_title：Experimental gerontology
pub_type： 杂志文章
doi：10.1016/0531-5565(83)90051-7
更新日期：1983-01-01 00:00:00
