Abstract：
:We compared cardiovascular responses to various adrenergic agonists in conscious 3-month and 12-month old rats that had been treated with propranolol daily for 7 days, to determine whether changes in beta-adrenergic hypersensitivity induced by abrupt propranolol withdrawal would differ with age. Depressor and tachycardic responses elicited by beta-adrenergic stimulation with isoproterenol were still reduced during the first 3 days following propranolol withdrawal, but were restored to pretreatment levels, more slowly in 12-month than in 3-month-old rats. Opposite pressor and bradycardic responses to alpha-adrenergic stimulation with phenylephrine did not differ between age groups, either before or after propranolol withdrawal. By contrast, pressor and bradycardic responses produced by combined alpha- and beta-adrenergic stimulation with epinephrine after propranolol withdrawal, though unaltered in 3-month-old rats, were enhanced in 12-month-old rats. Hence after sudden propranolol withdrawal beta-adrenergic sensitivity in conscious rats was gradually restored, rather than being enhanced, but more slowly at 12 than at 3 months of age. These results suggest that following abrupt cessation of prolonged propranolol treatment, restoration of normal beta-adrenergic sensitivity becomes delayed in older rats.
journal_name
Mech Ageing Devjournal_title
Mechanisms of ageing and developmentauthors
Teräväinen TL,Buñag RDdoi
10.1016/0047-6374(92)90019-asubject
Has Abstractpub_date
1992-03-15 00:00:00pages
91-103issue
1eissn
0047-6374issn
1872-6216pii
0047-6374(92)90019-Ajournal_volume
63pub_type
杂志文章abstract：:Mycobacteria are an important group of pathogenic bacteria. We generated a series of DNA repair deficient strains of Mycobacterium smegmatis, a model organism, to understand the importance of various DNA repair proteins (UvrB, Ung, UdgB, MutY and Fpg) in survival of the pathogenic strains. Here, we compared tolerance ...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章
doi：10.1016/j.mad.2013.08.006
更新日期：2013-10-01 00:00:00
abstract：:Structural changes of glycans are observed in different (patho)physiological conditions. Human placental membrane (glyco)proteins were isolated from the first and third trimester placentas of mothers at different ages. By using lectin microarray, we demonstrated that the placental membrane N-glycome contains several N...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章
doi：10.1016/j.mad.2019.111151
更新日期：2019-10-01 00:00:00
abstract：:Longevity regulatory genes include the Forkhead transcription factor FOXO, in addition to NAD-dependent histone deacetylase silent information regulator 2 (Sir2). The FOXO/DAF-16 family of transcription factors constitute an evolutionarily conserved subgroup within a larger family known as winged helix or Forkhead tra...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章
doi：10.1016/j.mad.2004.09.021
更新日期：2005-01-01 00:00:00
abstract：:The purpose of this research is to determine possible causes and mechanisms involved in the age-associated decline in mitochondrial activity. We have focused on cytochrome c oxidase because it is comprised of both nuclear and mitochondrial-encoded subunits and may provide some insight into the coordination of the two ...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章
doi：10.1016/s0047-6374(98)00043-8
更新日期：1998-06-15 00:00:00
abstract：:Age-related variations in the stromal cell population of human bone marrow were studied by means of a cloning assay. It was found that these cells are heterogeneous both in division capacity and in morphology. Fibroblast-like progenitor cells could be distinguished from epithelial-like cells, having only a very limite...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章
doi：10.1016/0047-6374(81)90006-3
更新日期：1981-01-01 00:00:00
abstract：:Primatologists have recognized that non-humans undergo the menopause [Biol. Reprod. 68 (2003) 10], which is preceded by years of irregular cycles and decreased fecundity. The similarity of reproductive changes between humans and baboons suggests that the aging female baboon is a particularly promising model to study h...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章
doi：10.1016/s0047-6374(03)00134-9
更新日期：2003-08-01 00:00:00
abstract：:It has been previously well documented that partial pressure of oxygen (PO2) and weight-specific rate of O2 consumption in chick embryo (Gallus gallus domesticus) transiently increase midway through the 21-day in ovo incubation period. The present study found that these oxidative changes were paralleled by the concent...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章
doi：10.1016/0047-6374(92)90125-w
更新日期：1992-08-01 00:00:00
abstract：:Cellular senescence is a phenomenon of irreversible growth arrest in mammalian somatic cells in culture. Various stresses induce cellular senescence and indeed, we have found that excess thymidine effectively induces cellular senescence in human cells. Further, many reports indicate the implication of chromatin protei...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章
doi：10.1016/j.mad.2019.01.001
更新日期：2019-03-01 00:00:00
abstract：:During adult life, the thymus involutes and thymic output of mature T cells drastically declines. The molecular events underlying this process are not well understood. Here, we present evidence of the importance of miRNAs in regulating T cell differentiation in the aged. miRNAs are a wide-ranging regulatory element in...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章
doi：10.1016/j.mad.2010.09.008
更新日期：2010-11-01 00:00:00
abstract：:Nitric oxide synthase (NOS) activity was enhanced in human umbilical vein endothelial cells (HUVECs) by the combined stimulation with IFN-gamma plus IL-1beta, TNF-alpha and LPS which was accompanied by cell death. DNA analysis of the NOS induced dead HUVECs showed that internucleosomal DNA fragmentation had occurred, ...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章
doi：10.1016/0047-6374(94)01579-b
更新日期：1995-06-30 00:00:00
abstract：:The decline in the lymphoproliferative response to mitogenic stimuli shows marked heterogeneity in elderly individuals. Adequate nutriture is required for optimal immune function, yet nutritional status may be compromised in the elderly. To address whether this variation in the proliferative response of elderly indivi...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章
doi：10.1016/s0047-6374(96)01838-6
更新日期：1997-03-01 00:00:00
abstract：:Long-Evans female rats three weeks, three months and 13-14 months of age were placed on tryptophan-deficient diets for periods ranging from a few months to nearly two years. Growth was interupted during the period of tryptophan-deficiency, but when the animals were returned to a complete diet, they gained weight and g...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章
doi：10.1016/0047-6374(76)90012-9
更新日期：1976-03-01 00:00:00
abstract：:In an interspecies comparison of seven primate species, the expression of the erbB proto oncogene was found to be higher in fibroblasts derived from three relatively long-lived species, the human, gorilla, and chimpanzee than in cells from the orangutan, pygmy chimpanzee, squirrel monkey, or red-bellied tamarin. No si...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章
doi：10.1016/0047-6374(87)90007-8
更新日期：1987-07-01 00:00:00
abstract：:Bone marrow (BM) from young (3 months) and old (24 months) C57BL/6J mice were tested for the total number of colony forming units, which remain unchanged with age. The BM from both groups was used to reconstitute syngeneic, lethally irradiated mice that were 3 months' old. The reconstituted mice were followed for a pe...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章
doi：10.1016/0047-6374(82)90114-2
更新日期：1982-03-01 00:00:00
abstract：:Endothelin (ET) is a powerful vasopressor agent that is activated in a number of pathophysiologic states where renal perfusion is reduced. Since renal vasoconstriction occurs as part of renal aging, we investigated the possibility that ET may be activated in the old kidney. These experiments involved acutely blocking ...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章
doi：10.1016/s0047-6374(97)00171-1
更新日期：1998-03-16 00:00:00
abstract：:Active vitamin D drugs are used for the treatment of osteoporosis in a number of countries, including Japan. However, their use is controversial. Here, we briefly discuss two issues that are important for understanding the role of active vitamin D (rather than plain vitamin D) in the treatment of osteoporosis: (1) whe...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章,评审
doi：10.1016/s0047-6374(00)00115-9
更新日期：2000-07-31 00:00:00
abstract：:Confluent late passage WI-38 human diploid fibroblast cultures grown in the presence or absence of hydrocortisone for fifteen population doublings were measured cytochemically for DNA, nuclear RNA, basic nuclear protein and acidic nuclear protein content during a 12-hour interval following a medium-change stimulation....
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章
doi：10.1016/0047-6374(81)90059-2
更新日期：1981-11-01 00:00:00
abstract：:An increasing body of data is progressively indicating that the comprehension of the epigenetic landscape, actively integrated with the genetic elements, is crucial to delineate the molecular basis of the inter-individual complexity of ageing process. Indeed, it has emerged that DNA methylation changes occur during ag...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章,评审
doi：10.1016/j.mad.2017.01.006
更新日期：2017-07-01 00:00:00
abstract：:To determine the effects of prolonged hypoxia and hypoxia-reoxygenation in senescent blood vessels, isolated aortic rings from 4- and 24-month-old (mo) Wistar rats were submitted to prolonged hypoxia (50 min) or hypoxia/reoxygenation (20 min/30 min) and contractile function recorded. Phenylephrine-induced contraction ...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章
doi：10.1016/s0047-6374(01)00327-x
更新日期：2002-02-01 00:00:00
abstract：:Age related changes in some aspects of glutamate metabolism were followed in the brain of a short lived species of tropical murrel, Channa punctatus. Both ammonia and glutamine contents of brain increased with advancing age of the murrel. The glutamate dehydrogenase activity of brain increased during maturation phase ...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章
doi：10.1016/0047-6374(93)90139-i
更新日期：1993-05-01 00:00:00
abstract：:Epigenetic modifications, including changes in DNA methylation, have been implicated in a wide range of diseases including neurological diseases such as Alzheimer's. The role of dietary folate in providing methyl groups required for maintenance and modulation of DNA methylation makes it a nutrient of interest in Alzhe...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章,评审
doi：10.1016/j.mad.2017.10.001
更新日期：2018-09-01 00:00:00
abstract：:Iron deficiency anaemia is prevalent in older age, particularly after the age of 80. Serum ferritin concentrations also decline, although there is no evidence to suggest that changes in iron stores are an inevitable consequence of ageing. Chronic inflammation is a common condition in older people, making the measureme...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章,评审
doi：10.1016/j.mad.2013.11.005
更新日期：2014-03-01 00:00:00
abstract：:The oral health of older people is changing with reducing numbers of people relying on complete dentures for function, and retaining some natural teeth. Despite this there are substantial numbers of older people whose ability to chew foods is compromised by their oral health status, either because they have few or no ...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章,评审
doi：10.1016/j.mad.2004.07.011
更新日期：2004-12-01 00:00:00
abstract：:Manganese superoxide dismutase (MnSOD or SOD2) is a key mitochondrial enzymatic antioxidant. Arguably the most striking phenotype associated with complete loss of SOD2 in flies and mice is shortened life span. To further explore the role of SOD2 in protecting animals from aging and age-associated pathology, we generat...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章
doi：10.1016/j.mad.2007.10.013
更新日期：2007-11-01 00:00:00
abstract：:The tumor suppressors p16(INK4a) and p53 have been implicated as contributors to age-associated stem cell decline. Key functions of p53 are the induction of cell cycle arrest, senescence, or apoptosis in response to DNA damage. Here, we examine senescence, apoptosis, and DNA damage responses in a mouse accelerated agi...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章
doi：10.1016/j.mad.2009.01.001
更新日期：2009-04-01 00:00:00
abstract：:Hepatic microsomal monooxygenase induction was investigated in young-adult and middle-aged male Fischer 344 rats. Monooxygenase components and drug metabolism activities were determined in liver microsomes prepared from rats treated with phenobarbital (PB, beta-naphthoflavone (BNF) or methyltestosterone (MT) and compa...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章
doi：10.1016/0047-6374(81)90021-x
更新日期：1981-01-01 00:00:00
abstract：:To examine the effect of an aging environment on sister chromatid exchange (SCE) induction, Ehrlich ascites tumor (EAT) cells were introduced into young and old C57BL/6J mice. Background SCE levels were not significantly different in either EAT cell or normal bone marrow cell populations between young and old animals....
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章
doi：10.1016/0047-6374(81)90051-8
更新日期：1981-12-01 00:00:00
abstract：:In this review we discuss the yeast as a paradigm for the study of aging. The budding yeast Saccharomyces cerevisiae, which can proliferate in both haploid and diploid states, has been used extensively in aging research. The budding yeast divides asymmetrically to form a 'mother' cell and a bud. Two major approaches, ...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章,评审
doi：10.1016/s0047-6374(00)00182-2
更新日期：2000-12-01 00:00:00
abstract：:In the lung of Rana perezi no differences as a function of age have been found for any of the five major antioxidant enzymes, reduced (GSH), oxidized (GSSG) or glutathione ratio (GSSG/GSH), oxygen consumption (VO2) and for in vivo or in vitro stimulated tissue peroxidation. This frog shows a moderate rate of oxygen co...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章
doi：10.1016/0047-6374(90)90089-x
更新日期：1990-12-01 00:00:00
abstract：:Morphometric comparison of freeze-fractured mitochondria in flight muscles of adult (37-day-old) and old (68-day-old) houseflies revealed a 28% decrease of cristae in the old flies. The major membrane change with age was an increase in the 90-120-A particles in the inner membrane external face concomitant with a loss ...
journal_title：Mechanisms of ageing and development
pub_type： 杂志文章
doi：10.1016/0047-6374(81)90095-6
更新日期：1981-06-01 00:00:00
