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描述:
Ciliary neurotrophic factor (CNTF) is a polypeptide initially purified from chick embryo
ocular tissue and identified as a trophic factor for embryonic chick ciliary parasympathetic
neurons in culture. Subsequent studies have demonstrated that CNTF is a survival factor
for additional neuronal cell types including: dorsal root ganglion sensory neurons,
sympathetic ganglion neurons, embryonic motor neurons, major pelvic ganglion neurons
and hippocampal neurons. CNTF has also been shown to prevent the degeneration of motor
axons after axotomy.The gene for human CNTF has been localized to the proximal region of
the long arm of chromosome 11. The cDNA for human CNTF encodes a 200 amino acid
residue polypeptide that lacks a signal sequence. CNTF is highly conserved across species
and exhibits crossspecies activities. Human and rat CNTF share approximately 83% homology
in their protein sequence. CNTF is structurally related to IL-6, IL-11, LIF and OSM. All of these
four helix bundle cytokines share gp130 as a signal-transducing subunit in their receptor
complexes.
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