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'''Cytokines''' are a diverse group of [[proteins]], [[peptides]], or [[glycoproteins]] that are produced by various [[cell (biology)|cell types]]. They function as signaling molecules, transmitting information between cells, particularly in immune responses and inflammation.<ref>''The New Oxford American Dictionary''</ref> These molecular messengers help coordinate the body's [[immune system]] and mount a defense against [[pathogen]]s and diseases.<ref>{{cite book |author=Gilman A. et al. |title=Goodman & Gilman's the Pharmacological Basis of Therapeutics |publisher=McGraw-Hill |location=New York |year=2001 |isbn=0-07-135469-7}}</ref> The line between cytokines and [[hormones]] has blurred as our understanding of these molecules evolves, revealing shared characteristics and overlapping functions.
[[File:Cytokine release following SARS-Cov-2 infection resulting in ARDS related to COVID-19.png|thumb|Cytokine release following SARS-Cov-2 infection resulting in ARDS related to COVID-19]]
==Cytokine Characteristics and Function==
[[File:Manifestations cliniques et biologiques du syndrome de libération des cytokines.jpg|thumb|Manifestations cliniques et biologiques du syndrome de libération des cytokines]]
Cytokines possess a local effect, with their signaling influencing cells in their immediate vicinity. Each cytokine molecule has a specific corresponding [[receptor (biochemistry)|receptor]] on the cell surface. When a cytokine binds to its receptor, it triggers a series of intracellular events through [[signal transduction]]. This cascade of signals can alter various cell functions, including the [[gene regulation|regulation]] of certain [[genes]], the production of other cytokines, or changes in the expression of surface receptors for other molecules.

The cytokine family encompasses several sub-groups, including [[interferon]], [[prostaglandin]], [[interleukin]], [[tumor necrosis factor]]s, and [[colony-stimulating factor]]s, among others. These cytokines, in concert, regulate the immune response, mediating cell-to-cell communication, cell growth, differentiation, and death, as well as promoting or inhibiting inflammation.<ref name="Kuby">{{Cite book |last=Kuby |first=J |title=Immunology |publisher=W.H. Freeman Company |year=2007 |isbn=978-1429202114}}</ref>

==Detection of Cytokines==

The levels of cytokines can be detected and quantified in laboratory settings using techniques such as [[enzyme-linked immunosorbent assay]] (ELISA) and [[enzyme-linked immunospot]] (ELISPOT). These assays are instrumental in studying the role of cytokines in health and disease.<ref>{{Cite journal |last=Zhou |first=L |title=Elispot for measuring human immune responses to vaccines |journal=Expert Review of Vaccines |volume=10 |issue=2 |pages=299-306 |year=2011 |doi=10.1586/erv.10.170}}</ref>

==Clinical Importance of Cytokines==

Given their central role in immune regulation and response, cytokines are essential to understanding the pathophysiology of many diseases. Their dysregulation can lead to various disorders, including autoimmune diseases, inflammatory diseases, and cancers. Therapeutically, cytokines or their inhibitors can be used in the treatment of such diseases.<ref>{{Cite journal |last=Turner |first=MD |title=Cytokines and chemokines: At the crossroads of cell signalling and inflammatory disease |journal=Biochimica et Biophysica Acta (BBA) - Molecular Cell Research |volume=1843 |issue=11 |pages=2563-2582 |year=2014 |doi=10.1016/j.bbamcr.2014.05.014}}</ref>

==Types of Cytokines==

Cytokines are classified into several types based on their function, cell of origin, or target of action. These include [[interferon]]s (IFNs), which are critical for antiviral responses; [[interleukin]]s (ILs), which are responsible for communication between white blood cells; [[tumor necrosis factor]]s (TNFs), which are involved in systemic inflammation and are part of the immune system's acute phase reaction; and [[growth factor]]s, which are important for cell growth, proliferation, and differentiation.<ref>{{Cite journal |last=Oppenheim |first=JJ |title=Roles of antimicrobial peptides such as defensins in innate and adaptive immunity |journal=Annals of the Rheumatic Diseases |volume=62 |issue=Supplement 2 |pages=ii17-ii21 |year=2003 |doi=10.1136/ard.62.suppl_2.ii17}}</ref>

==Cytokines and Disease==

The deregulation or dysregulation of cytokines can lead to a variety of disease states. Overproduction of cytokines, known as a "cytokine storm," can cause severe inflammation and tissue damage, and is implicated in conditions such as sepsis and the acute respiratory distress syndrome (ARDS).<ref>{{Cite journal |last=Van der Poll |first=T |title=Cytokines and coagulation in severe sepsis |journal=Thrombosis and Haemostasis |volume=89 |issue=5 |pages=738-742 |year=2003}}</ref> Conversely, inadequate cytokine production can result in uncontrolled infection or tumor growth. Additionally, certain cytokines have been linked to autoimmune disorders, such as rheumatoid arthritis and lupus, as well as allergic conditions, including asthma and allergic rhinitis.<ref>{{Cite journal |last=Dinarello |first=CA |title=Proinflammatory and anti-inflammatory cytokines as mediators in the pathogenesis of septic shock |journal=Chest |volume=112 |issue=6 |pages=321S-329S |year=1997}}</ref>

==Cytokines in Therapy==

Given their crucial role in the body's immune responses, cytokines have been harnessed for therapeutic purposes. For example, recombinant versions of cytokines, such as interferons and interleukins, are used in treating some forms of cancer and autoimmune diseases.<ref>{{Cite journal |last=Lenz |first=HJ |title=Cytokines in colorectal cancer |journal=International Journal of Colorectal Disease |volume=20 |issue=6 |pages=478-492 |year=2005 |doi=10.1007/s00384-005-0050-6}}</ref> Moreover, drugs that block cytokine activity, known as cytokine inhibitors, have proven effective in conditions like rheumatoid arthritis and psoriasis.<ref>{{Cite journal |last=Melsheimer |first=R |title=Remicade (infliximab) |journal=BioDrugs |volume=17 |issue=3 |pages=194-202 |year=2003}}</ref>

==Future Research==

The study of cytokines is a rapidly evolving field, and ongoing research continues to elucidate the roles of these important signaling molecules in health and disease. Future research will likely involve the discovery of novel cytokines, the development of new therapeutic approaches to manipulate cytokine activity, and a deeper understanding of how cytokines interact with various cellular and molecular components of the immune system.<ref>{{Cite journal |last=Borish |first=LC |title=Cytokines and chemokines |journal=Journal of Allergy and Clinical Immunology |volume=111 |issue=2 |pages=S460-S475 |year=2003 |doi=10.1067/mai.2003.108}}</ref>

==Summary==

Cytokines, as cellular signal mediators, have a profound impact on the body's immune response and homeostasis. Understanding their intricate networks and their roles in various physiological and pathological processes is central to the fields of immunology, oncology, and infectious disease. This understanding can further facilitate the development of innovative therapeutic strategies aimed at targeting specific cytokines or their receptors.<ref>{{Cite journal |last=Mantovani |first=A |title=The chemokine system in diverse forms of macrophage activation and polarization |journal=Trends in Immunology |volume=25 |issue=12 |pages=677-686 |year=2004 |doi=10.1016/j.it.2004.09.015}}</ref>

==See also==
* [[Immune system]]
* [[Chemokines]]
* [[Inflammation]]
* [[Cell signaling]]

==References==
{{Reflist}}
{{stub}}
[[Category:Immunology]]
[[Category:Cell biology]]
[[Category:Proteins]]
[[Category:Biochemistry]]

Cytokine - Revision history

Prab at 18:06, 19 March 2025

Prab at 00:46, 28 May 2023