Cytokine and inflammation mediator dynamics after burn

Overview¶

A major burn is a lesion in which the inflammatory reaction is exported to the whole body ^[3]. Significant thermal injury incites an inflammatory response, and this is what distinguishes burns from other forms of trauma ^[11]. Inflammatory mediators play a major role in both the local burn wound and the systemic response to burn injury ^[1]. Major burns generate a marked pathophysiological inflammatory response through a widespread release of abundant pro-inflammatory mediators that predispose patients to a systemic inflammatory response syndrome, sepsis, and multi-organ failure ^[10].

The clinical relevance of this response is direct. Failure to adequately address the surge of inflammatory mediators central to the post-burn state can lead to catastrophic results, and the same mediators that protect can, when uncontrolled, kill the patient through multiple organ failure ^[10]. Understanding which mediators rise, when they rise, and how their magnitude tracks injury severity is therefore not academic; it shapes how we anticipate sepsis, organ dysfunction, and death at the bedside.

Time-course of the mediator response¶

The mediator response is not a single event but a sequence. Thermal injury induces a two-phase inflammatory response: first a pro-inflammatory state that produces systemic inflammatory response syndrome, then an anti-inflammatory phase characterized by a profound defect in cellular-mediated immunity ^[18]. This is a fulminant inflammatory state with high levels of both pro- and anti-inflammatory mediators after extensive thermal injury ^[34]. The macrophage is the central cellular element, and very complex molecular products, especially cytokines, interact to produce significant pathophysiologic consequences on cardiovascular homeostasis and endothelial permeability that worsen prognosis ^[18].

The acute-phase arm of this response is prolonged. Severe burns induce a typical prolonged acute phase response that starts approximately 4 to 8 hours after burn and persists for months, up to a year after the initial trauma ^[17]. During this period acute-phase proteins, including C-reactive protein and complement components C3, C4, and C5, are released into the blood, contributing to the recruitment and migration of inflammatory cells ^[17]. A prolonged acute phase response can induce local tissue damage, hamper healing, and cause negative systemic effects across several organs, including the heart, lungs, kidney, and central nervous system ^[17].

Individual mediators follow distinct kinetics. In one experimental time-course, IFN-gamma, IL-6, and IL-10 levels increased through the fifth day while TNF-alpha reached its peak at the seventh day ^[14]. The early shift toward immune suppression is real: following burn, type 1 T-helper responses are suppressed with diminished IL-2, IFN-gamma, and IL-12, while the type 2 response is enhanced with elevated IL-10 and IL-4 ^[19]. Dendritic-cell biology mirrors this; after burn trauma, splenic conventional dendritic cells became anti-inflammatory dominant, producing high IL-10 (greater than 50% increase) and low IL-6, TNF-alpha, and IL-12p70 in response to TLR9 activation ^[20].

Mediator classes and the Th-17 paradigm¶

The well-characterized inflammatory mediators tumor necrosis factor-alpha, interleukin-1-beta, and interleukin-6 are the workhorses of the post-burn response and continue to play an active role in mediating cardiac dysfunction ^[4]. Beyond these early cytokines, late mediators such as high-mobility group box 1 and macrophage migration inhibitory factor are of particular interest because they offer a realistic window for therapeutic intervention to control the inflammatory response ^[4]. Burn also raises a broad chemokine signature; significant levels of TNF-alpha, IL-6, monocyte chemoattractant protein-1 (MCP-1), and keratinocyte-derived chemokine (KC) appear in burn wound tissue and wound fluid, and burn injury induced 3-fold higher KC and 50-fold higher IL-6 in wound fluid than non-burn injury ^[8]. An experimental comparison of burn and sepsis found MCP-1, GRO/KC, IL-12, IL-18, and IL-10 elevated in both, while IL-10 was uniquely increased in the burn group ^[21].

A more recent paradigm centers on T-helper-17 biology. A novel class of T-helper cells, termed Th-17 cells, secretes the pro-inflammatory cytokines IL-17 and IL-22 ^[6]. At 3 hours after burn, a significant (roughly 3-fold) increase in tissue levels of IL-17 and IL-22 was observed at the burn site compared with sham skin ^[6]. These findings indicate the development of a robust Th-17 response at the burn site that may play an important role in subsequent immune and wound-healing derangements ^[6]. Th17 cells produce the effector cytokines IL-17, IL-21, and IL-22 under the regulation of ROR-gamma-t ^[7]. Alongside Th-17 biology, there has been promising investigation into the role of gamma-delta T cells and Th-17 cells in regulating and propagating the inflammatory response after severe burn ^[10].

Pathophysiology¶

The local wound is the engine of the systemic response. The classic chemokine cascade begins at the skin: dermal KC levels rise significantly at 4 hours, return to baseline at 8 hours, and are elevated again from 1 to 3 days post-burn, with KC elevated 15-fold above sham levels at 3 days ^[9]. The influx of neutrophils into the skin follows the expression of KC ^[9]. Burn increases skin cytokine levels for a number of prototypic inflammatory cytokines including IL-1-beta, IL-6, TNF-alpha, and macrophage inflammatory protein 1-beta, alongside an expansion of CD11b myeloid cells in the wound ^[22]. Gamma-delta T cells regulate this myeloid cell infiltration of the wound site and act to quell inflammation, promoting transition to the proliferative phase of healing ^[22].

Macrophages are major producers of pro-inflammatory mediators, and their productive capacity for these mediators is markedly enhanced after thermal injury ^[51]. This macrophage hyperactivity appears to be of critical importance in the development of post-burn immune dysfunction ^[51]. The activation of a pro-inflammatory cascade after burn is important in the subsequent development of immune dysfunction, susceptibility to sepsis, and multiple organ failure ^[51].

The skin wound also seeds distant organ injury. Lung tissue injury after thermal skin burns depends on chemotactic mediators, and lung expression of TNF-alpha and IL-1 after thermal injury of skin is C5a-dependent ^[12]. The development of lung vascular injury following thermal skin injury was significantly attenuated by anti-C5a (84%), anti-KC (67%), and anti-MIP-2 (77%) ^[12]. The neuropeptide substance P is a critical mediator here: burn augments substance P and NK1-receptor signaling, with heightened lung inflammation and increased proinflammatory IL-1-beta, TNF-alpha, and IL-6 after injury, while an NK1-receptor antagonist given before injury reversed pulmonary inflammation ^[16]. Even in the absence of inhalational injury, acute lung injury is a common cause of morbidity and mortality in patients with severe burns ^[5].

Vascular permeability is mediator-driven. Leukocytes are systemically activated following burns, and heparin-binding protein, released by neutrophils, rises 5-fold in plasma on the first day after injury, consistent with a role as a mediator of the early burn-induced increase in vascular permeability ^[52].

Magnitude versus burn severity¶

A recurring theme across decades of data is that the size of the mediator response scales with the size of the injury. The incidence of systemic inflammatory response syndrome and multiple organ dysfunction syndrome was three times higher in patients with more than 30% total body surface area burned ^[55]. Serum IL-6 is one of the better-characterized severity-linked mediators: a moderate correlation between IL-6 levels and the abbreviated burn severity index has been observed (r = 0.554; P < 0.0001) ^[25]. In pediatric dermal burns, IL-6 and IL-8 levels correlated significantly with total body surface area on the third day after injury ^[29].

Anaemia, hypoalbuminemia, and the percentage of burn are each significantly correlated with the incidence of systemic inflammatory response syndrome, with burn surface area the most influential factor ^[59]. A modified systemic inflammatory response syndrome score, together with age and full-thickness burn area, were independent risk factors for death in patients with large-area burns ^[30].

Assessment and biomarkers¶

Cytokine measurement has moved from physiology toward prognosis. Serum levels of IL-6 are very sensitive to surgical stress and may be a useful indicator of the general condition of severely burned patients ^[23]. Prolonged and excessive elevations of circulating IL-6 after trauma, burns, and elective surgery are associated with complications and mortality, and the early post-injury IL-6 response correlates with both complications and mortality ^[24]. In severely burned children, serum IL-6, IL-12p70, and TNF can identify patients at high risk of death from sepsis ^[26].

Several mediators serve as outcome biomarkers. In a large-scale proteomics study, interleukin-4, interleukin-8, granulocyte-macrophage colony-stimulating factor, monocyte chemotactic protein-1, and beta-2-microglobulin correlated well with survival and may serve as clinical biomarkers ^[28]. IL-8 carries particularly strong prognostic weight in ventilated patients: early increases in plasma IL-8 are associated with a multifold increase in death or ventilator-associated pneumonia, and elevated IL-8 was independently associated with that composite endpoint ^[27]. The most promising prognostic indicators identified to date include decreased IL-12, elevated IL-10, soluble IL-2 receptor-alpha, IL-18 levels, the IL-6:IL-10 ratio, and the degree of Th1 suppression as measured by diminished IL-2 and IFN-gamma ^[19]. Certain cytokine profiles, ratios, and polymorphisms may help identify patients at increased risk of systemic inflammatory response syndrome, sepsis, multiple organ failure, and deep venous thrombosis ^[19].

Management¶

The bedside reality is sobering: nearly all therapeutic strategies directed specifically at neutralizing inflammatory mediators or cytokines to control sepsis have failed in clinical trials, and treatment of established organ failure is usually unsuccessful, which is why prevention has become the rational focus ^[33]. The prevailing strategy is to blunt the first hit, prevent the second hit, and supplement with visceral and nutritional support ^[33].

Despite that, several modulating approaches have signals in the literature. Blood purification techniques, including plasma exchange, continuous venovenous hemofiltration, and adsorbing membranes, have the potential to modulate the inflammatory response and improve outcomes ^[34]. Continuous plasma filtration absorption can facilitate the treatment of burn sepsis by efficiently decreasing pro-inflammatory cytokines, alleviating the systemic inflammatory response, and improving immune status ^[36]. Ulinastatin attenuates the systemic inflammatory response and visceral vasopermeability and may serve as a therapeutic agent to prevent fluid leakage after major burn ^[37], and in a rodent model it decreased cTnI, IL-1, IL-6, and TNF-alpha while protecting the myocardium ^[38]. Mesenchymal stem cell strategies act through cytokine modulation: human umbilical cord MSC-derived exosomes overexpressing miR-181c suppressed the TLR4 signaling pathway and alleviated inflammation in burned rats ^[39], and MSC transplantation suppressed secondary inflammatory reaction by lowering inflammatory cytokines, promoting wound healing ^[14].

Targeting the wound directly is one of the more coherent strategies. Topical p38 MAPK inhibition reduced proinflammatory cytokine expression and neutrophil sequestration in burn wounds and attenuated wound inflammation without interfering with bacterial host defense ^[40]. Extracorporeal shock-wave therapy applied 1 hour after wounding significantly blunted neutrophil and macrophage infiltration and potently attenuated chemokine and acute proinflammatory cytokine expression at the wound margin ^[41]. Among systemic anabolic and modulating agents, a meta-analysis found that recombinant human growth hormone lowered IL-6 and TNF-alpha and reduced the incidence of sepsis ^[42].

Complications¶

The mediator response is the proximate driver of the worst burn complications. A widespread release of pro-inflammatory mediators predisposes patients to systemic inflammatory response syndrome, sepsis, and multi-organ failure ^[10]. Multiple organ dysfunction syndrome is the final result of the liberation and interplay of multiple inflammatory mediators, and a two-hit phenomenon operates in its pathogenesis: the first hit is the burn and its hypovolemic shock, followed by a septic second hit ^[33]. Once cytokine secretion goes out of control, a cytokine storm forms ^[48]. Excessive activation of the innate immune response leads to cytokine storms, multiple organ failure, and even death ^[50].

This burden extends across organ systems. The classic cytokines TNF-alpha, IL-1-beta, and IL-6 mediate cardiac dysfunction after burn ^[4]. Acute lung injury is a common cause of morbidity and mortality even without inhalational injury ^[5], and TNF-alpha and neutrophils are important participants in the pathogenesis of burn-induced lung injury ^[5]. Innate immune cell recovery is protective: NLRP12-deficient mice exhibited significantly greater mortality, an inability to fight bacterial infection, and heightened proinflammatory cytokines, while anti-TNF antibody improved peripheral immune recovery ^[49].

Special Considerations¶

The inflammatory response is not uniform across populations. Critically ill elderly burn patients had significantly lower levels of IL-6, MCP-1, MCP-3, and granulocyte-colony stimulating factor during the acute phase, and their response is characterized by cardiac depression and hypoinflammation ^[43]. Elderly patients mount a delayed and dampened inflammatory response early after burn that changes to an augmented response at later time points, with a late immune-exhaustion phenotype associated with striking mortality ^[44].

Sex modifies the response: systemic inflammatory markers and stress hormone levels were significantly decreased in females, and female burned patients exert an attenuated inflammatory and hypermetabolic response compared with males ^[45]. Children carry a distinct and durable signature. Pediatric burn survivors have long-term immune dysfunction, with TNF-alpha, IL-2, IL-7, and IFN-gamma significantly elevated and diminished antibody responses to vaccine antigens, demonstrating a lasting change to the immune profile ^[46]. Salivary cytokine profiles differ between healthy children and children with burns, with IL-1-beta and IL-4 significantly elevated in pediatric burn patients ^[47]. The extreme end is illustrated by a 5-year-old with a 91% burn who developed cytokine storm three times during the hospital course ^[54].

Controversies and Evidence Gaps¶

The central controversy is therapeutic. Despite a detailed mechanistic map of the mediator cascade, nearly all strategies aimed at neutralizing individual inflammatory mediators or cytokines to control sepsis have failed in clinical trials, and treatment of established organ failure is usually unsuccessful ^[33]. This failure is what has shifted rational attention toward preventing the syndrome rather than reversing it ^[33].

Measurement itself is contested. Assessment of only peripheral blood mononuclear cell function in burn patients may not accurately reflect the patient's actual immune status at the tissue level ^[56]. Circadian variation in cytokine production could significantly affect cytokine levels measured in clinical and animal studies and may explain some of the reported discrepancies among studies ^[57]. The prognostic role of composite scores is also unsettled: in one cohort, the systemic inflammatory response syndrome score at admission was not increasingly predictive of deleterious outcomes on multivariable analysis, and a model using age, full-thickness burn percentage, and inhalation injury outperformed it ^[58].

Two structural gaps remain. First, the literature has not converged on a single mediator or panel that reliably stratifies risk early enough to change management, though IL-6, IL-8, and several ratios are leading candidates ^[28]. Second, the durable post-burn immune alterations seen in survivors, particularly children, are recognized but not yet matched by interventions ^[46].

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