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- Glasbey, JC, et al.
(författare)
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- 2021
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swepub:Mat__t
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- Deane, Colleen S., et al.
(författare)
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The acute transcriptional response to resistance exercise : impact of age and contraction mode
- 2019
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Ingår i: Aging. - : Impact Journals LLC. - 1945-4589. ; 11:7, s. 2111-2126
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Tidskriftsartikel (refereegranskat)abstract
- Optimization of resistance exercise (RE) remains a hotbed of research for muscle building and maintenance. However, the interactions between the contractile components of RE (i.e. concentric (CON) and eccentric (ECC)) and age, are poorly defined. We used transcriptomics to compare age-related molecular responses to acute CON and ECC exercise. Eight young (21 +/- 1 y) and eight older (70 +/- 1 y) exercise-naive male volunteers had vastus lateralis biopsies collected at baseline and 5 h post unilateral CON and contralateral ECC exercise. RNA was subjected to next-generation sequencing and differentially expressed (DE) genes tested for pathway enrichment using Gene Ontology (GO). The young transcriptional response to CON and ECC was highly similar and older adults displayed moderate contraction-specific profiles, with no GO enrichment. Age-specific responses to ECC revealed 104 DE genes unique to young, and 170 DE genes in older muscle, with no GO enrichment. Following CON, 15 DE genes were young muscle-specific, whereas older muscle uniquely expressed 147 up-regulated genes enriched for cell adhesion and blood vessel development, and 28 down-regulated genes involved in mitochondria! respiration, amino acid and lipid metabolism. Thus, older age is associated with contraction-specific regulation often without clear functional relevance, perhaps reflecting a degree of stochastic age-related dysregulation.
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- Willis, Craig R.G., et al.
(författare)
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Network analysis of human muscle adaptation to aging and contraction
- 2020
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Ingår i: Aging. - : Impact Journals LLC. - 1945-4589. ; 12:1, s. 740-755
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Tidskriftsartikel (refereegranskat)abstract
- Resistance exercise (RE) remains a primary approach for minimising aging muscle decline. Understanding muscle adaptation to individual contractile components of RE (eccentric, concentric) might optimise RE-based intervention strategies. Herein, we employed a network-driven pipeline to identify putative molecular drivers of muscle aging and contraction mode responses. RNA-sequencing data was generated from young (21±1 y) and older (70±1 y) human skeletal muscle before and following acute unilateral concentric and contralateral eccentric contractions. Application of weighted gene co-expression network analysis identified 33 distinct gene clusters ('modules') with an expression profile regulated by aging, contraction and/or linked to muscle strength. These included two contraction 'responsive' modules (related to 'cell adhesion' and 'transcription factor' processes) that also correlated with the magnitude of post-exercise muscle strength decline. Module searches for 'hub' genes and enriched transcription factor binding sites established a refined set of candidate module-regulatory molecules (536 hub genes and 60 transcription factors) as possible contributors to muscle aging and/or contraction responses. Thus, network-driven analysis can identify new molecular candidates of functional relevance to muscle aging and contraction mode adaptations.
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- Chow, Clara K., et al.
(författare)
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TEXT messages to improve MEDication adherence and Secondary prevention (TEXTMEDS) after acute coronary syndrome: a randomised clinical trial protocol
- 2018
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Ingår i: BMJ Open. - : BMJ PUBLISHING GROUP. - 2044-6055. ; 8:1
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Tidskriftsartikel (refereegranskat)abstract
- Background Identifying simple, low-cost and scalable means of supporting lifestyle change and medication adherence for patients following a cardiovascular (CV) event is important. Objective The TEXTMEDS (TEXT messages to improve MEDiGation adherence and Secondary prevention) study aims to investigate whether a cardiac education and support programme sent via mobile phone text message improves medication adherence and risk factor levels in patients following an acute coronary syndrome (ACS). Study design A single-blind, multicentre, randomised clinical trial of 1400 patients after an ACS with 12 months follow-up. The intervention group will receive multiple weekly text messages that provide information, motivation, support to adhere to medications, quit smoking (if relevant) and recommendations for healthy diet and exercise. The primary endpoint is the percentage of patients who are adherent to cardioprotective medications and the key secondary outcomes are mean systolic blood pressure (BP) and low density lipoprotein cholesterol. Secondary outcomes will also include total cholesterol, mean diastolic BP, the percentage of participants who are adherent to each cardioprotective medication class, the percentage of participants who achieve target levels of CV risk factors, major vascular events, hospital readmissions and all-cause mortality. The study will be augmented by formal economic and proGess evaluations to assess acceptability, utility and Gost-effectiveness. Summary The study will provide multicentre randomised trial evidence of the effects of a text message-based programme on cardioprotective medication adherence and levels of CV risk factors. Ethics and dissemination Primary ethics approval was received from Western Sydney Local Health District Human Research EthiGs Committee (HREC2012/12/4.1 (3648) AU RED HREC/13ANMEAD/15). Results will be disseminated via peer-reviewed publications and presentations at international conferences.
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- Corcoran, Paul A., et al.
(författare)
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The effect of different strains of Helicobacter pylori on platelet aggregation
- 2007
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Ingår i: Canadian Journal of Gastroenterology. - 0835-7900. ; 21:6, s. 367-370
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND AND AIMS: Helicobacter pylori is the major causative agent in peptic ulcer disease and is strongly implicated in the development of gastric cancer. It has also been linked, less strongly, to cardiovascular disease. The mechanisms by which certain Strains of H pylon induce platelet aggregation through interactions with platelet glycoprotein 1b have been previously described. METHODS: In the present study, 21 different strains of H pylori, varying in their vacuolating toxin gene, cytotoxic-associated gene A status and other pathogenicity factors, were tested for their ability to induce platelet agggregation. RESULTS: Ten of the 21 strains induced platelet aggregation, a response that appeared to be independent of their vacuolating toxin gene and cytotoxic-associated gene A status. CONCLUSIONS: Platelet aggregation has been suggested to be one of the possible mechanisms involved in the effects on the cardiovascular system induced by H pylori. Our results suggest that any putative role H pylon plays in cardiovascular disease may be strain dependent. Further work to identify the H pylon factors involved in induction of platelet aggregation may allow for identification of 'higher risk' strains for cardiovascular disease.
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| 9. |
- McDonald, Kenneth, et al.
(författare)
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Daily home BNP monitoring in heart failure for prediction of impending clinical deterioration: results from the HOME HF study
- 2018
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Ingår i: European Journal of Heart Failure. - : WILEY. - 1388-9842 .- 1879-0844. ; 20:3, s. 474-480
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Tidskriftsartikel (refereegranskat)abstract
- Background Serial measurement of natriuretic peptides may guide management in heart failure (HF) patients. In previous trials, natriuretic peptides were infrequently monitored, which may undervalue the benefit of this approach. Methods and results HOME was an adaptive three-arm randomized clinical study to test whether home monitoring of BNP could reduce HF-related death, hospitalization due to acute decompensated HF (ADHF), and ADHF treated with intravenous diuretics in the emergency department or outpatient setting. Enrolment was terminated early because of slow enrolment, low event rates, and the belief that an algorithm for assessing BNP trends was needed. Justification for pooling data from all study arms was made and analysis as a single observational study was performed. The analysis resulted in 107 patients who were monitored for a median of 172 days with BNP measures on a median of 74% of days. BNP values were highly variable within a patient. Dispersion between serial BNPs was calculated to be 39.3%, 57.7%, and 73.6% for 1, 60, and 120 days between measures, respectively. A moving average filter (fBNP) was calculated to reduce day-to-day fluctuations and track changes from week to week. There were 27 primary events in 17 362 patient days of monitoring; the hazard ratio for time-varying fBNP was 2.22 (95% confidence interval 1.48-3.34) per unit natural log (corresponding to a 2.72-fold change in fBNP level). Conclusion The HOME HF study demonstrates the feasibility of home BNP measurement and shows the potential value of fBNP as an index of emerging clinical deterioration. Assessment of the clinical value of this is required.
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