[Interleukin-5].
Interleukin-5 (IL-5) is a glycoprotein with molecular weight 40 to 50 kDa that consists of homodimer. The murine cDNA encodes 133 amino acids with a signal sequence of 18 amino acids. The human cD NA codes for a protein with 134 amino acids in which the first 19 are the predicted signal sequence. There is 70% homology at the amino acid level between murine and human IL-5. IL-5 R alpha chain cDNA encodes p 60 that binds IL-5 with low affinity. The beta subunit of IL-5, GM-CSF, and IL-3 receptor complexes is shared and these receptors show some functional cross-reactivity. Both alpha and beta chains of IL-5 R belong to a cytokine receptor superfamily. It is important to note that whilst murine IL-5 causes the activation of B cells and eosinophil differentiation, human IL-5 only causes eosinophil differentiation. IL-5 plays an important role in eosinophilopoiesis in vivo as well as in vitro.
Dept. of Medical Biology and Parasitology, Jichi Medical School, Tochigi, Japan.
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Yamaguchi
D000818:Animals; D004804:Eosinophils; D006410:Hematopoiesis; D006801:Humans; D015848:Interleukin-5 / Q000737:chemistry / Q000235:genetics / Q000502:physiology; D051379:Mice; D008970:Molecular Weight; D018123:Receptors, Interleukin / Q000378:metabolism; D053649:Receptors, Interleukin-5; D013601:T-Lymphocytes / Q000276:immunology
D015848:Interleukin-5; D018123:Receptors, Interleukin; D053649:Receptors, Interleukin-5