Cytokine (CK) is a low molecular weight soluble protein induced by
immunogens, mitogens or other stimulants. It has many functions in
regulating innate and adaptive immunity, hemocytogenesis, cell growth,
APSC pluripotent cells and damaged tissue repair. Cytokines can be
divided into interleukins, interferons, tumor necrosis factor superfamily,
colony-stimulating factors, chemokines, growth factors and so on.
Multicellular cytokines play a role in vivo through paracrine, autocrine
or endocrine ways, with pleiotropic, overlapping, antagonistic,
synergistic and other physiological characteristics, forming a very
complex cytokine regulatory network, involved in a variety of important
physiological functions of the human body.