J Pure Appl Microbiol | Review Article | Volume 13, Issue 1 | Article Number: 5506

Shailza Shreshtha1, Pradeep Kumar1, Preeti Sharma1* and Rachna Sharma2

1Department of Biochemistry, Santosh Medical College and Hospital, Ghaziabad – 201 001, India. 2Department of Biochemistry, TSM Medical College and Hospital, Lucknow – 226 003, India.
Corresponding Author E-mail: prcdri2003@yahoo.co.in
Received: 17/01/2019 | Accepted: 01/03/2019 | Published: 28/03/2019
DOI: http://dx.doi.org/10.22207/JPAM.13.1.14



Cytokine release syndrome (CRS) is a life threatening toxicity associated numerous immunotherapeutic techniques involving monoclonal antibodies, bispecific antibodies and adoptive T cell therapies. It is also referred as infusion reaction that results in release of large amount cytokines (Like IL-6, IFN-r, INF) from the target cells. Cytokines when released in excessive amounts into the circulation produces systemic symptoms like nausea, shills, fever, rashes, headache, hypotension, dyspenea etc. Most of the patients present mild to moderate symptoms which can be managed easily but some patients show life threatening symptoms. Studies have shown that immunosuppressive agents like corticosteroids and tocilizumab can reverse the toxicity of CRS, however such immunosuppression may limit the immunotherapeutic efficacy. Therefore specific precautions must be considered in such patients to present exacerbation of the complication. Thus this review is based on the overview of CRS which include etiology, mechanism and management of CRS, so that immunotherapeutic benefits can be maximized with minimum risk of complication.


Cytokine release syndrome, monoclonal antibodies, chimeric antigen receptor modified T- cells, cortiocsteroids, tocilizumab.

Citation: Shailza Shreshtha, Pradeep Kumar, Preeti Sharma and Rachna Sharma, Cytokine Release Syndrome: An Overview on its Features and Management, J Pure Appl Microbiol., 2019; 13(1):133-140 doi: 10.22207/JPAM.13.1.14


Treatment of various disorders whether malignant or non-malignant via use of mono-clonal antibodies or adoptive therapy using modified T cells, have now evolved as an integral part in clinical practice. Though there is wide spread use, such treatment regimen can also result in serious and fatal outcomes, one of which is described as Cytokine release syndrome (CRS)1.

Cytokines, the chemical messengers that are protein in nature, are produced by majority of the cells in the body2. Some examples of cytokines are interleukins (ILs), tumor necrosis factor (TNF) and interferons (IFNs). Broadly cytokines may be categorized as monokines, lymphokines and chemokines. Cytokines of macrophages or monocytes origin are called monokines while cytokines that originate from lymphocytes are termed as lymphokines. Similarly the cytokines that attract immune effector cells to the targeted area by binding on to the target cells are known as chemokines1.

Cytokines perform various functions in the body. Some of them are as follows:

Aid in cell to cell communication

Involved in hematopoiesis

Regulate the functions of both innate and acquired immune system and also coordinate their responses with various organs2

Stimulate or inhibits cellular growth

Activate lymphocytes or other immune effector cells

Stimulate degradation of monoclonal antibody targeted cells

Mediates inflammatory responses1.

Cytokines exhibit regulatory functions similar to that of hormones; however they are distinct from hormones with regards to pleotropic function and redundant nature2. They are important in host defense and tissue homeostasis but abnormally high level can cause acute and chronic impairments, one of the known examples being cytokine release syndrome (CRS). CRS was unknown till 1990s when it was observed in the patients whom Muromonab CD3 (anti-mouse monoclonal antibody) was administered to treat allograft rejection3. After this several other antibodies associated with CRS were identified such as Chimeric rituximab (anti- CD20), Humanised alemtuzumab (anti-CD 52) and TGN1412 (CD 28 agonist)4.

CRS is a cytokine associated toxicity that results from excessive immune activation. Immune activation is the basic mechanism underlying modern immunotherapies in order to attain desired clinical benefit. However, activation of immune system by immuno-therapeutic agents beyond the normal results in the flooding of cytokine and adverse effects. Since immunotherapeutic techniques are becoming more trendy in the recent times, the prevalence of CRS is also increasing5.

Some recent reports have shown that CRS can also develop after infusion of bispecific antibodies such as blinatumomab (used in leukemia)6, haploid mononuclear cells (used in refractory leukemia) and adoptive immuno-therapies (use of genetically engineered T-cells that express chimeric antigen receptors, CART)7.

Symptoms associated with CRS in most of the patients are mild (flu, fever and myalgias) while they may be severe in some patients. The severe inflammatory syndromes include hypotension, vascular leak, pulmonary edema, coagulopathy and multiple organ system failure. The details of symptoms and sites of body affected are shown in table 1. Recently CRS induced death has also been reported after the administration of blinatumomab8.

Table (1):
Symptoms associated with CRS and sites of body affected

Organ systems affected Symptoms
Constitutional Fever, headache, anorexia, malaise, myalgias, rigors [11, 12]
Integument Skin rashes [11]
Blood Cytopenias (anaemia, leucopenia, lymphopenia, thrombocytopenia), increase in D-dimer, hypofibrinogenemia [10, 13]
Cardiovascular Mild: Tachycardia with fever

Severe: Hypotension, decreased cardiac output, arrhythmias, cardiac arrest [14,15]

Pulmonary Hypxia, dyspnea, pulmonary edema, pneumonitis, mechanical ventilation required in some cases [5,16]
Gastrointestinal Diarrhoea, abdominal pain, colitis, hyperbilirubinemia, transaminitis [17,18]
Renal Electrolyte imbalances, azotemia, renal injury due to reduced renal perfusion [11,15]
Nervous Headache, confusion, hallucination, dysphasia, tremor, seizure, facial nerve palsy, altered gait [8]
Musculoskeletal Elevated creatine kinase, myalgias, weakness [11,15]

Time of onset of symptoms and severity of CRS depend on the drug infused, level of immune activation and burden of the disease9. In case of rituximab, symptoms appear within minutes to hours after administration of drug. In some cases CRS may be followed by hemophagocytic lymphohistocytosis (HLH). Study of Grupp SA et al showed that, among the patients who had undergone CD19-CART therapy, one patient was reported to have severe CRS along with HLH. The patient was found to have mutated perforin gene that is responsible for HLH development10. This clinical finding has aroused the question whether host genetic factor influences the occurrence of CRS following immunotherapies, which need further research evidences.

Mechanism of CRS development following immunotherapy
On administration of monoclonal antibodies
There are two basic mechanisms which describes development of CRS after therapy involving monoclonal antibodies (mAB). They are type 1 reaction and type 2 reaction. Type 1 reaction involves Fab region of mAB. Fab binds with the activation receptors present on the surface of target cells thereby leading to the generation of transduction signal and flooding of cytokines. Monoclonal antibodies such as TGN412 and muronomab act via this mechanism.

In case of type 2 reaction, there is involvement of Fc region of mAB. Fc receptors present on the surface of antibody opsonised target cells bind with Fc region of antibody followed by signal transduction and massive release of cytokines. Drugs like rituximab and alemtuzumab act via this mechanism. An alternate mechanism has also been postulated which states that these antibodies may activate natural killer cells and cause flooding of cytokines through ligation of CD-163.

T-cell engaging therapies
Genetically modified T-cells or CART
T-lymphocytes can be genetically modified to express a domain called single chain fragment variable (scFv) region. Such modified T-cells are called CART cells. The new domain scFv binds to signaling and co-stimulatory domains (CD Z8 and CD137) of T- cell receptor19. CART cell therapy can result in CRS by direct or indirect mechanisms. In case of direct mechanism, the infused modified T cells directly induces the production and release of cytokines in excessive amount. Indirectly, such infused cells first secrete cytokines in response to which other immune cells like macrophages secrete large amount of cytokines20. T cell engaging therapies cause activation immune cascade leading to HLH/MAS in both the patients predisposed with or without known mutation in gens causing HLH21.

Bispecific T-cell engagers
Bispecific T-cell engagers, also termed as BiTEs, are molecules developed mostly for cancer immunotherapy. In BiTEs there are two single chain variable fragments (scFv) connected by a flexible linker. Of two chains, one chain links with CD3 molecule and the other binds with antigen associated tumor cells. Upon ligation T- cells are stimulated and cytokines are released that ultimately leads to tumor clearance. Various BiTEs are now being developed and subjected to clinical trials to assess their efficacy and safety. Some examples are blinatumomab (MT 103), MT 110, BAY2010112 etc25.

Biomarkers and diagnosis of CRS
In CRS, large amount of cytokines are released in circulation. However several issues are still to be addressed for effective use of such cytokine measurement to diagnose and define the severity of disorders. Some important issues are:-

Need of clinical laboratory improvement amendments (CLIA) certified assays which are not readily available in most of the hospitals.

Prediction of severity of disorders on the basis of cytokine level is uncertain7

Profiles of different cytokines are needed to be studied rather than single.

Though number of cytokines is produced, recent immunotherapeutic practices involve inhibition of IL-6 signaling as, it is implicated to be a central mediator of CRS related toxicities7.

Currently CRP is also being extensively studied as a laboratory marker of CRS and its severity7. However CRP is also increased in various infections, so it lacks specificity on demarking infections associated with inflammation from infectious inflammation27. It has been observed in previous studies that levels of CRP correlated with the severity of CRS. According to Davila et al., significant differences in the levels of CRP among patients with CRS can be observed within two days after infusion of immunotherapeutic drugs and the level correlated with that of IL-67. Though targeting IL-6 is considered successful in cancer therapy, Teachey et al stated that serum IL-6 measurement after CART infusion has no benefit since there was no significant increase in IL-6 levels in their study28. However, their observation was in contrast to that of Turtle et al who showed highly elevated IL-6 levels in the patients following infusion of CART and in the patients with severe CRS associated with neurotoxicity29. Thus more studies are required to identify specific biomarkers to CRS so that it can be diagnosed and managed beforehand of its complexities.

Management of CRS
Management of CRS is somewhat challenging. Various treatment strategies have evolved as follows:

Corticosteroids are the treatment of choice in lowering the effects of CRS in the disorders that involved activated T-cells. Examples of such disorders include inflammatory processes and graft vs. host disease30. Studies have shown that corticosteroids can be used as a routine supportive care in blina-tumomab therapy. According to Porter et al, the patient who received corticosteroids after CART-19 therapy, showed a partial response. It is postulated that steroids (Corticosteroids) when administered invitro reduces the level of cytokines without influencing bispecific T-cell engager associated activation of T-cell31. However use of corticosteroids in high dose for long duration can decrease efficacy of CART- cells and limit their anti-leukemic effects7. The efficiency of corticosteroids to blunt CRS still needs to be elaborated with further researches.

Fig. 1. Type 1 reaction                                            Fig. 2.  Type 2 reaction

Targeting cytokines
CRS can also be managed by directly targeting the elevated cytokine level. Cytokines like IL-10, IL-16 and IFN-t are significantly increased in CRS32. These cytokines are released by monocytes or macrophages that regulate both innate and adaptive immunity33,34.

IL-10 acts as a negative regulator and thus it may not be an ideal target in CRS. Similarly, increased IFN-t levels are required for the efficiency of T-cell therapy, thereby making it an unsuitable target. While, IL-6, though involved in inflammatory processes, it is still unclear whether it helps in proliferation of T-cell via feedback loop. However, it is hypothesized that toxicity of CRS can be reduced by suppressing IL-6 without affecting efficacy of immunotherapy. Blockade of IL-6 by tocilizumab has shown significant withdrawal of severe CRS symptoms10,6. Tocilizumab, a IL-6 blocker, is a recombinant monoclonal antibody that prevents the binding of IL-6 with its receptors35. It is first choice of therapy for CRS. In some patients severe CRS may be associated with MAS (macrophage activation syndrome) or hemophagocytic lymphohisto cytosis (HLH). HLH is a rare immune disorder characterized by cytopenias, prolonged fever, hyperferritinemia, hypertriglyceridemia, spleenomegaly, coagulopathy, decreased efficacy of natural killer cells and elevation in cytokine level36. Tocilizumab, through used rapidly in blunting CRS manifestation, should be avoided in patients suspected with MAS22].

Other blockers of IL-6 like situximab and IL-6 trans-signal blocker (sgp130FC) are also available commercially. They have the potential to blunt CRS but need support from further studies37. Other cytokines which are increased in CRS include IL-ZR, MCP-1 and MIP IB. Therefore approaches for management of CRS including use of inhibitors of MCP-1 and MIBO 1B are in the process of development. They are still to be used clinically while inhibitors of TNFg, IL-1R and IL-2R have been used clinically38.

Fig. 3.1 Isolation of T cells from blood® transfection of T cells with genetically engineered viral vector® introduction of new gene to T cell®insertion of engineered T cells back to human host22
Fig. 3.2 ARs combine with scFVs of monoclonal antibodies. CARs are then inserted to T cells of host via viral mediated gene transfer23.

Though the numbers of therapeutic strategies are available for CRS, they may impair T-cell action and treatment efficacy. Therefore, it is suggested that further in depth researchers are needed before considering the strategy postulated to be the novel therapeutic modality and also it is recommended to make treatment decisions on the basis of clinical parameters rather than rarely analyzing the panels of cytokine released.

Fig. 4. Formation and action of BiTEs26

Fig. 5. Action of IL-6 blockers and corticosteroids38

Grading of CRS and treatment modality5,40
CRS associated with immunotherapies involving antibodies has been categorized into 5 different grades by the National Career Institute Common Terminology for adverse events (CTCAE) as follows:

Grade Complications Therapeutics
1 No associated life threatening complications Symptomatic treatment can  be applied
2 Low grade hypotension, mild respiratory symptoms (hypoxia), grade 2 organ toxicity Moderate therapeutic interventions required

For hypotension: -fluids or vasopressors (Low Dose)

For hypoxia: – low flow oxygen (<48%) →Monitor function of heart and other organs

3 High grade hypotension, hypoxia, grade 3 organ toxicity like coagulopathy, renal dysfunction, cardiac dysfunction and grade 4 transaminitis Aggressive intervention is needed

For hypotension: – high dose or multiple vasopressor drugs

For hypoxia: –high flow oxygen (<40%)

Assessment of cardiac and other organ function

Use of immunosuppressants (corticosteroids, tocilizumab)

4 Life threatening symptoms like potentially low cardiac output, coagulopathy, multiple organ failure, grade 4 organ toxicity, no transaminitis Mechanical ventilation

Use of immune suppressors

5 Death


Advances made in immunotherapeutic techniques are quite promising but regular use of such treatment modalities requires appropriate recognition and management of potential hazards associated with them, CRS is one of the emerging complexities associated with immunotherapies. CRS can be presented with mild to life threatening symptoms, therefore it is important for the clinicians to outline the effective management strategy which not only prevents the life threatening symptoms but also avoids the unnecessary immunosuppression which can lead to the decreased efficacy of immunotherapeutic regimens. More intense studies are needed for better understanding of CRS pathophysiology and as the severity and complications of CRS are dependent on burden of disease, use of such regimens in patients with lower burden may be produce fruitful outcomes with reduced toxicities.




The authors declare that there is no conflict of interest.


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