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The Biology of Chronic Preconditioning: Genomic and Physiologic Mechanisms of Response

2014-07-24 14:00:37 | BioPortfolio

Summary

The purpose of this study is to assess the effects of repeated RIPC and exercise, on exercise performance, skeletal muscle responses and circulating cellular and humoral biology in humans

Description

Remote ischemic preconditioning (RIPC) results in a powerful and widespread protective effect against subsequent prolonged ischemia-reperfusion (IR) injury of distant organs and systemic inflammatory responses, both of which are key elements in the evolution of local and multiorgan effects of many clinical IR syndromes. The signal transduction within the target organ to generate ischemia tolerance, and the effects of RIPC on systemic anti-inflammatory pathways, however, remain to be elucidated fully. Particularly, data regarding the mechanisms of 'second window' protection (a resurgence of protection 24-72 hrs after the initial RIPC stimulus) is scant; even less is known of the effects of repeated RIPC, and a potential 'third window' of protection. Our preliminary data and several recent publications have shown that the biology of RIPC and exercise show considerable overlap. This research has raised the possibility of a reciprocal effect between RIPC and exercise, with chronic exercise being a model of the potential effects of 'chronic preconditioning'. This is relevant, as repeated RIPC might be a strategy to improve exercise function in those with limited exercise tolerance e.g. heart failure.

Study Design

Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Crossover Assignment, Masking: Open Label, Primary Purpose: Basic Science

Conditions

Ischemic Preconditioning

Intervention

Remote ischemic preconditioning (RIPC), Exercise

Location

The Hospital for Sick Children
Toronto
Ontario
Canada
M5G 1X8

Status

Recruiting

Source

The Hospital for Sick Children

Results (where available)

View Results

Links

Published on BioPortfolio: 2014-07-24T14:00:37-0400

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the Influence of Remote Ischemic Preconditioning on Inflammation During Human Endotoxemia

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PubMed Articles [3663 Associated PubMed Articles listed on BioPortfolio]

Mirna-Mediated Mechanisms of Cardiac Protection in Ischemic and Remote Ischemic Preconditioning - A Qualitative Systematic Review.

Ischemic preconditioning (IPC) and remote ischemic preconditioning (RIPC) protect myocardial tissue against subsequent ischemia and reperfusion injury (IRI) and have a high potential to improve patien...

Resistance exercise mediates remote ischemic preconditioning by limiting cardiac eNOS uncoupling.

Currently viewed as a complementary non-pharmacological intervention for preventing cardiac disorders, long-term aerobic training produces cardioprotection through remote ischemic preconditioning (RIP...

Remote Ischemic Preconditioning does not Prevent White Matter Injury in Neonates.

Remote ischemic preconditioning (RIPC) is a mechanism to protect tissues from injury during ischemia and reperfusion. We investigated the neuroprotective effects of RIPC in neonates undergoing cardiac...

Novel Benefits of Remote Ischemic Preconditioning Through VEGF-dependent Protection From Resection-induced Liver Failure in the Mouse.

To investigate the impact of remote ischemic preconditioning (RIPC) on liver regeneration after major hepatectomy.

Tefillin Use Induces Remote Ischemic Preconditioning Pathways in Healthy Males.

This study assessed whether tefillin use (tight, non-occlusive, wrapping of the arm) elicits a remote ischemic preconditioning (RIPC) like effect in subjects with both acute and chronic use.

Medical and Biotech [MESH] Definitions

The application of repeated, brief periods of vascular occlusion at the onset of REPERFUSION to reduce REPERFUSION INJURY that follows a prolonged ischemic event. The techniques are similar to ISCHEMIC PRECONDITIONING but the time of application is after the ischemic event instead of before.

A technique in which tissue is rendered resistant to the deleterious effects of prolonged ischemia and reperfusion by prior exposure to brief, repeated periods of vascular occlusion. (Am J Physiol 1995 May;268(5 Pt 2):H2063-7, Abstract)

Exposure of myocardial tissue to brief, repeated periods of vascular occlusion in order to render the myocardium resistant to the deleterious effects of ISCHEMIA or REPERFUSION. The period of pre-exposure and the number of times the tissue is exposed to ischemia and reperfusion vary, the average being 3 to 5 minutes.

Ischemic injury to the OPTIC NERVE which usually affects the OPTIC DISK (optic neuropathy, anterior ischemic) and less frequently the retrobulbar portion of the nerve (optic neuropathy, posterior ischemic). The injury results from occlusion of arterial blood supply which may result from TEMPORAL ARTERITIS; ATHEROSCLEROSIS; COLLAGEN DISEASES; EMBOLISM; DIABETES MELLITUS; and other conditions. The disease primarily occurs in the sixth decade or later and presents with the sudden onset of painless and usually severe monocular visual loss. Anterior ischemic optic neuropathy also features optic disk edema with microhemorrhages. The optic disk appears normal in posterior ischemic optic neuropathy. (Glaser, Neuro-Ophthalmology, 2nd ed, p135)

Restoration of blood supply to tissue which is ischemic due to decrease in normal blood supply. The decrease may result from any source including atherosclerotic obstruction, narrowing of the artery, or surgical clamping. It is primarily a procedure for treating infarction or other ischemia, by enabling viable ischemic tissue to recover, thus limiting further necrosis. However, it is thought that reperfusion can itself further damage the ischemic tissue, causing REPERFUSION INJURY.

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