RIPC for multiorgan salvage in clinical settings: Evolution of concept, evidences and mechanisms
Introduction
Ischemia is a vascular disease that is characterized by restriction in blood supply, causing shortage of oxygen and vital nutrients, thus hampering normal cellular metabolism. Establishment of circulation is necessary to resuscitate the tissues and eventually, protect them from cell death after transient absence of oxygen and nutrients in the blood. Prolonged occurrence of ischemia and thereafter, reperfusion results in ischemia-reperfusion-induced injury as a result of release of oxygen free radicals, cytokines and increase in the expression of adhesion molecules (Kukielka et al., 1993, Welbourn et al., 1991). Intraoperative ischemia-reperfusion-induced injury is one of the fundamental causes in the perpetuation of transitory and delayed organ dysfunction (Błogowski et al., 2012, Xie et al., 2012). Therefore, for the sake of providing protection to the organs against ischemia-reperfusion injury, development of a novel therapeutic approach is the need of the hour.
RIPC is a treatment strategy in which alternate cycles of preconditioning ischemia followed by reperfusion are delivered to a remote organ (other than heart) which protects the heart against subsequent index ischemia (sustained ischemia) and reperfusion induced injury (Gho et al., 1996; Przyklenk, 2013). Preclinically, short episodes of occlusion and reperfusion of the arteries such as cerebral, mesenteric, intestinal (Wang et al., 2008), renal (Spinale et al., 2000, Diwan et al., 2008b, Kant et al., 2008), abdominal aorta (Taliyan et al., 2010), skeletal muscle (Liem et al., 2003) produce preconditioning of myocardium against sustained ischemia and reperfusion in various animals like mice, rats etc. However, these approaches may not be directly translated in clinical settings. In clinical setups, the best utilized way for providing myocardial protection is rendering the forelimb (skeletal muscle) ischemic by applying blood pressure cuff on the upper arm. This is advantageous as it is a non-invasive and clinically feasible technique except for surgical procedures. Furthermore, upper limb is more resistant to ischemic insult as even a mild ischemia to vital organs can result in non-reversible cellular injury.
In clinical setup, RIPC is generally initiated by inflating blood pressure cuff tied on the upper arm 20 mm Hg greater than systolic arterial pressure, rendering the forearm ischemic for 5 min followed by 5 min intermittent reperfusion. This cycle may be repeated for three to four consecutive periods (Cheung et al., 2006, D׳Ascenzo et al., 2014, Karuppasamy et al., 2011). However, different scientists have made modifications in the protocol to induce ischemia-reperfusion injury of varying degrees. The concept of RIPC came into existence in clinical settings when Cheung et al. subjected 17 children with congenital heart defects to RIPC and this treatment strategy significantly attenuated troponin levels (a chief indicator of myocardial injury) (Cheung et al., 2006). Furthermore, studies conducted by other researchers have reported reduction in neuronal (Gonzalez et al., 2013, Hu et al., 2010), kidney (Er et al., 2013, Walsh et al., 2009; Wu et al., 2014), intestinal and pulmonary injury (Li et al., 2013) in individuals after being subjected to RIPC stimulus (Table 1). RIPC stimulus has also improved the initial distance covered in patients with complaints of intermittent claudication (pain in legs during walking) in the lower limbs (Saes et al., 2013).
The involvement of hypoxia inducible factor-1α (HIF-1α) (Albrecht et al., 2013), ATP-sensitive potassium channels, (KATP channels) (Loukogeorgakis et al., 2007), signal transducer and activator of transcription (STAT) (Heusch et al., 2012), matrix metalloproteinases (MMPs) (Zitta et al., 2012), O-linked β-N-acetylglucosamine (O-GlcNAc) levels (Jensen et al., 2013), autonomous nervous system (ANS) (Loukogeorgakis et al., 2005) in mediating RIPC-induced cardioprotective effects have been explored clinically (Fig. 1). The present review describes the evidences and possible mechanisms of RIPC-induced multiorgan salvage from ischemia-reperfusion injury in clinical settings.
Section snippets
Evolution of concept
Ischemic preconditioning is a therapeutic strategy brought into notice in 1986 by Murry, Jennings and Reimer in order to alleviate ischemia-reperfusion-induced injury (Murry et al., 1986). Murry et al. demonstrated that short ischemic episodes to an organ (in the form of ischemic preconditioning) afford protection against sustained ischemia and reperfusion injury (Murry et al., 1986). This concept has been expanded to include pharmacological preconditioning (Khanna et al., 2008). Remote
Myocardial injury
Myocardial injury is a common drawback encountered during various cardiac surgeries employing cardiopulmonary bypass that takes over the function of the heart and lungs during surgery in order to maintain circulation of blood. Degree of myocardial injury is assessed by making measurements of cardiac markers that reveal the functional status of the heart. The widely used specific and sensitive biomarkers for evaluating heart function include cardiac troponin and creatinine kinase levels. Cardiac
Possible mechanisms for beneficial effects of RIPC
RIPC has provided beneficial effects in alleviating ischemia-reperfusion-induced injury in various remote organs. The potential mechanisms involved in providing RIPC-induced mutiorgan protection have not been widely explored in clinical settings. However, clinically observed multiorgan protection can be correlated with preclinical studies of RIPC to unveil the possible mechanisms involved in RIPC-induced tissue protection in clinical set-ups. The mechanisms involved in providing RIPC-induced
Conclusion
RIPC became a successful approach in numerous species of animals in order to provide multiorgan salvage. Consequently, RIPC evolved in clinical settings and provided beneficial effects in alleviating ischemia-reperfusion-induced injury in various remote organs. There are several reports emphasizing the role of RIPC in conferring cardioprotection, renoprotection, while undergoing various surgical/non surgical interventions that include coronary artery bypass graft surgery, abdominal aortic
Acknowledgments
The authors are thankful to Department of Science and Technology F. no. SB/SO/HS/0004/2013, New Delhi for their gratefulness for providing us financial assistance and Department of Pharmaceutical Sciences and Drug Research, Punjabi University, Patiala, India for supporting us.
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