Interleukin-7: physiological roles and mechanisms of action.
Cytokine Growth Factor Rev
; 10(1): 41-60, 1999 Mar.
Article
em En
| MEDLINE
| ID: mdl-10379911
ABSTRACT
Interleukin-7 (IL-7), a product of stromal cells, provides critical signals to lymphoid cells at early stages in their development. Two types of cellular responses to IL-7 have been identified in lymphoid progenitors (1) a trophic effect and (2) an effect supporting V(D)J recombination. The IL-7 receptor is comprised of two chains, IL-7R alpha and gamma(c). Following receptor crosslinking, rapid activation of several classes of kinases occurs, including members of the Janus and Src families and PI3-kinase. A number of transcription factors are subsequently activated including STATs, c-myc, NFAT and AP-1. However, it remains to be determined which, if any, previously identified pathway leads to the trophic or V(D)J endpoints. The trophic response to IL-7 involves protecting lymphoid progenitors from a death process that resembles apoptosis. This protection is partly mediated by IL-7 induction of Bcl-2, however other IL-7-induced events are probably also involved in the trophic response. The V(D)J response to IL-7 is partly mediated through increased production of Rag proteins (which cleave the target locus) and partly by increasing the accessibility of a target locus to cleavage through chromatin remodeling.
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Base de dados:
MEDLINE
Assunto principal:
Linfócitos
/
Interleucina-7
Tipo de estudo:
Prognostic_studies
Limite:
Animals
/
Humans
Idioma:
En
Revista:
Cytokine Growth Factor Rev
Assunto da revista:
ALERGIA E IMUNOLOGIA
/
BIOQUIMICA
Ano de publicação:
1999
Tipo de documento:
Article
País de afiliação:
Estados Unidos