Dipeptidyl Amino-Peptidase 3 (DPP3) in Cardiogenic Shock: History
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Contributor:
Pasquale Innelli
,
Teresa Lopizzo
,
Giovanni Paternò
,
Noemi Bruno
,
Rosa Paola Radice
,
Pietro Bertini
,
Alberto Marabotti
,
Giampaolo Luzi
,
Eugenio Stabile
,
Aldo Di Fazio
,
Giuseppe Pittella
,
Gianluca Paternoster

Dipeptidyl amino-peptidase 3 (DPP3) is an aminopeptidase that is released into circulation upon cell death. DPP3 is involved in the degradation of angiotensins, enkephalines, and endomorphines. It has been shown that circulating DPP3 (cDPP3) plasma concentration increases in cardiogenic shock (CS) patients and correlates with high mortality risk. Cardiogenic shock is a life-threatening syndrome associated with organ hypoperfusion. One of the common causes of CS is acute myocardial infarction (AMI).

  • DPP3
  • cardiogenic shock
  • mechanical ventilation

1. Diseases of the Cardiovascular System

Cardiovascular disease accounts for over two-thirds of total mortality worldwide and is an emerging serious health issue in middle- to low-income countries as well as in high-income countries [1]. Atherosclerotic cardiovascular disease is a collective term comprising of a group of disorders of the heart and blood vessels. These disorders are the largest cause of morbidity and death worldwide. Coronary heart disease, cerebrovascular disease and peripheral arterial disease are the most frequently occurring cardiovascular diseases. Early diagnosis of these disorders by means of better diagnostic tools is fundamental.

2. Cardiogenic Shock

Cardiogenic shock (CS) is a clinical condition in which ineffective cardiac output, caused by a primary cardiac disorder, results in inadequate tissue perfusion. The clinical presentation is typically characterized by persistent hypotension unresponsive to volume replacement and is accompanied by clinical features of end-organ hypoperfusion requiring intervention with pharmacological or mechanical support [2][3].
In general, there is a profound myocardial contractility depression resulting in a deleterious spiral of reduced cardiac output, low blood pressure, and further coronary ischemia (Figure 1).
Figure 1. Acute myocardial infarction spiral. LVEDP, left ventricular end-diastolic pressure.
This classic paradigm also includes a lot of compensatory mechanisms, such as systemic vasoconstriction, that result in an ineffective stroke volume [4][5]. Consequently, CS and the downstream mechanisms induced thereby are strongly related to reduced end-organ perfusion with high risk of mortality and morbidity [6][7]. The management of CS frequently includes vasoactive drugs, circulatory and ventilatory support, and coronary revascularization in case of an acute myocardial infarction [8][9]. The management of CS is mostly based on clinicians’ experience rather than evidence-based recommendations since, for many treatments, either no adequately designed randomized clinical trials (RCT) exist or their results failed to show relevant beneficial effects. Hence, scarce advances have been achieved in the treatment of CS and patients’ outcomes remain poor [10]. In this context, particular attention is given to delineation of inclusion and exclusion criteria in RCTs in order to better understand the pathophysiology of patients that will and will not respond to medical treatment. Refractory cardiogenic shock refers to an ill-defined severity of CS not responding to standard therapies. In the pre-mechanical circulatory support (MCS) era, refractoriness to standard medical treatment led inevitably to death. The implementation of MCS opened new doors for the treatment of CS and modified the interpretation of “refractory” shock and its prognosis. However, the lack of a standard definition and nomenclature undermines research and clinical decision making in refractory CS.

3. Dipeptidyl Amino-Peptidase 3 in the Context of Cardiovascular Diseases

Dipeptidyl amino-peptidase 3 (DPP3) is an intracellular zinc-dependent enzyme [11] and is ubiquitously expressed in many cell types and tissues, including neutrophils, lungs, liver, kidney, and heart [12][13]. It has been reported that during cell death, intracellular DPP3 is released into circulation and, consequently, has been named circulating DPP3 (cDPP3) [14][15]. cDPP3 degrades angiotensins [16][17], enkephalines [17][18], and endorphines [19]. Therefore, it has been implicated in the modulation of many physiological processes, such as blood pressure regulation [16], inflammatory processes [13], and pain modulation [19]. The most notable DPP3 substrate is angiotensin II (Ang II), which serves as the primary effector molecule of the renin–angiotensin–aldosterone system (RAAS). The RAAS plays a vital role in regulating the cardiovascular system homeostasis, modulating blood pressure through the sympathetic system, glomerular filtration, releasing endogenous catecholamine and vasopressin, and stimulating vascular smooth muscle cells [20][21].
Increased blood levels of cDPP3 have been observed in critically ill patients suffering from septic, cardiogenic and haemorrhagic shock [22][23]. Furthermore, an association between high cDPP3 levels in the blood and high mortality in shocked patients in the ICU [22][23][24] has been shown. CS is a heterogenous syndrome associated with low cardiac output, organ hypoperfusion, and hypoxia, which leads to multi-organ failure and death [25][26]. The most common cause of cardiogenic shock remains acute myocardial infarction (AMI), representing 5–8% of patients with AMI [27]. Deniau et al. have shown that non-survivor CS patients had higher cDPP3 levels at all time points compared to survivors [24]. Furthermore, high cDPP3 levels in CS patients were associated with severe organ dysfunction. Consequently, cDPP3 levels at admission were predictive for 90-day mortality. Interestingly, a decrease in cDPP3 levels within 24 h of admission was associated with reduced 90-day mortality, decreased cardiovascular support, and renal function improvement [25].
Takagi et al. attempted to delineate a clinical role for cDPP3 and confirm the relationship between cDPP3 and clinical outcomes measured in patients with ST-elevation myocardial infarction (STEMI) and CS from the OptimaCC trial. The authors established the relationship between cDPP3 and the development of refractory CS, defined as shock non-responsive to inotropes and vasopressors with optimal cardiac filling pressures [22]. The authors have shown that cDPP3 levels are higher in patients that develop refractory CS within 72 h from admission to the ICU [22]. In addition, cDPP3 levels at admission could discriminate patients who did develop refractory shock from those who did not. Patients with high cDPP3 levels also exhibited lower cardiac index, low glomerular filtration rate, and higher Simplified Acute Physiology Score II (SAPS II) [22]. More importantly, CS patients with high cDPP3 levels at inclusion but decreased levels at 24 h showed a striking reduction in refractory shock and death [22].
Similar results have been observed in severe sepsis and septic shock patients. In this patient population, there is also a significant association between high cDPP3 blood levels upon ICU admission and 28-day mortality, high need for organ support, including prolonged need for vasopressor(s), mechanical ventilation and renal replacement therapy [28][29]. Interestingly, intravenous injection of DPP3 induced myocardial depression in healthy mice while inhibition of cDPP3 with Procizumab (a specific monoclonal antibody against cDPP3) normalized myocardial function in an acute heart failure mouse model, suggesting cDPP3 as a potential therapeutic target in patients with acute heart failure and shock. Pharmacological inhibition of cDPP3 by Procizumab also improved cardiac dysfunction and reduced mortality in septic rats [30].
The use of cDPP3 could be beneficial in helping clinicians make decisions on how to approach cardiogenic shock, such as recommendation of rapid transfer to a tertiary care center or the use of an intra-aortic balloon pump for high cDPP3 patients. Additionally, cDPP3 could be used to monitor a patient’s progress and help guide therapeutic decisions. Decreasing cDPP3 levels could lead to a recommendion for a less aggressive approach. Furthermore, cDPP3 together with other clinical and biological parameters could be used as a population-enrichment strategy in CS trials [31]. Finally, randomized clinical trials should clarify whether pharmacological inhibition of cDPP3 could be a novel therapeutic approach to improve hemodynamics and cardiovascular prognosis in CS patients.

This entry is adapted from the peer-reviewed paper 10.3390/diagnostics13071350

References

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