Cytokines are a group of proteinaceous signalling compounds that, like hormones and neurotransmitters, are used extensively for inter-cell communication.



Cytokines are a group of proteinaceous signalling compounds that, like hormones and neurotransmitters, are used extensively for inter-cell communication.

While hormones are secreted from specific organs to the blood and neurotransmitters are related to neural acitivity, the cytokines are a more diverse class of compounds in terms of origin and purpose. They are critical to the functioning of both innate and adaptive immune responses. Apart from their importance in the development and functioning of the immune system, cytokines play a major role in a variety of immunological, inflammatory and infectious diseases. They are also involved in several developmental processes during embryogenesis.

Cytokines are produced by a wide variety of cell types (both haemopoietic and non-haemopoietic) and can have effects on both nearby cells or throughout the organism, sometimes strongly dependent on the presence of other chemicals and cytokines. The cytokine family consists mainly of smaller water-soluble proteins and glycoproteins (proteins with an added sugar chain) with a mass of 8-30 kDa.

Effects

Each cytokine binds to a specific cell-surface receptor. Subsequent cascades of intracellular signalling then alter cell functions. This may include the upregulation and/or downregulation of several genes and their transcription factors, in turn resulting in the production of other cytokines, an increase in the number of surface receptors for other molecules, or the suppression of their own effect by feedback inhibition.

Therefore, cytokines are characterized by considerable "redundancy", in that many cytokines can share similar functions. In a comparable manner, cytokines are also pleiotropic (acting on many different cell types). Of course, this would be an anticipated corollary if one considers the simple fact that a given cell type may express receptors for more than one cytokine, or that many different tissues can express receptors for the same cytokine.

Generalisation of functions is not possible with cytokines; nonetheless, their actions may be comfortably grouped as:

  • autocrine, if the cytokine acts on the cell that secretes it
  • paracrine, if the action is restricted to the immediate vicinity of a cytokine's secretion
  • endocrine, if the cytokine diffuses to distant regions of the body (carried by blood or plasma) to affect different tissues.

Cytokines binding to antibodies paradoxically have a stronger immune effect than the cytokine alone. This may lead to lower therapeutic doses and perhaps fewer side effects.

Overstimulation of cytokines can trigger a dangerous syndrome known as a cytokine storm; this may have been the cause of severe adverse events during a clinical trial of TGN1412.

Nomenclature

Cytokines have been variously named as lymphokines, interleukins and chemokines, based on their presumed function, cell of secretion or target of action. Because cytokines are characterized by considerable redundancy and pleiotropism, such distinctions, allowing for exceptions, are obsolete.

The term interleukin was initially used by researchers for those cytokines whose presumed targets are principally leukocytes. It is now used largely for designation of newer cytokine molecules discovered every day and bears little relation to their presumed function. The term chemokine referred to a specific class of cytokines that mediated chemoattraction (chemotaxis) between cells. The latter term alone has been retained (see below).

Of note, IL-8 (interleukin-8) is the only chemokine originally named an interleukin.

Classification

Structural homology has been able to partially distinguish between cytokines that do not demonstrate a considerable degree of redundancy so that they can be classified into four types:

  • The four ?-helix bundle family - Member cytokines have three-dimensional structures with four bundles of ?-helices. This family in turn is divided into three sub-families:
    1. the IL-2 subfamily
    2. the interferon (IFN) subfamily
    3. the IL-10 subfamily
    The first of these three subfamilies is the largest. It contains several non-immunological cytokines including erythropoietin (EPO) and thrombopoietin (THPO). Alternatively, four ?-helix bundle cytokines can be grouped into long chain and short chain cytokines.
  • the IL-1 family - It primarily includes IL-1 and IL-18.
  • the IL-17 family - It has yet to be completely characterized, though member cytokines have a specific effect in promoting proliferation of T-cells that cause cytotoxic effects.
  • Chemokines

A more clinically and experimentally useful classification divides immunological cytokines into those that promote the proliferation and functioning of helper T-cells, type 1 ( IFN-? etc.) and type 2 (IL-4, IL-10, IL-13, TGF-? etc.), respectively. A key focus of interest has been that cytokines in one of these two sub-sets tend to inhibit the effects of those in the other. This tendency is under intensive study for its possible role in the pathogenesis of autoimmune disorders.

Cytokine receptors

In recent years, the cytokine receptors have come to demand the attention of more investigators than cytokines themselves, partly because of their remarkable characteristics, and partly because a deficiency of cytokine receptors have now been directly linked to certain debilitating immunodeficiency states. In this regard, and also because the redundancy and pleiomorphism of cytokines are in fact a consequence of their homologous receptors, many authorities are now of the opinion that a classification of cytokine receptors would be more clinically and experimentally useful.

A classification of cytokine receptors based on their three-dimensional structure has therefore been attempted. (It must be noted that such a classification, though seemingly cumbersome, provides with several unique perspectives for attractive pharmacotherapeutic targets.)

References

See also

External links


Cell signaling
Key concepts    - Ligand | Receptor | Second messenger | Protein kinase | Transcription factor | Cell signaling networks
Pathways    - Apoptosis | Ca2+ signaling | Cytokine signaling | Hedgehog | Integrin signaling | JAK/STAT | Lipid signaling | MAPK/ERK pathway | mTOR | NF-kB | Notch | p53 | TGF? | Wnt


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