Signaling protein; neurotrophic cytokine
CNTF
CNTF is a signaling protein studied in neurotrophic and cellular systems. In vitro responses depend on receptor-complex composition. CNTF must not be confused with CNTFR-alpha, a receptor component distinct from the ligand.
This is a research reference, not a product offered in the Asciende catalog. Published studies do not establish the identity, purity or availability of a commercial preparation.
Protein, preparation and functional assay
Preserve the particular preparation and assay. Declared mass does not substitute for measured activity, and a protein name does not resolve all its forms.
- Which isoform, chain length and preparation were investigated?
- Are identity and, where relevant, an activity determination documented?
- Does the response arise from the isolated compound or a combination and its vehicle?
Mechanism described in the literature
Introducing CNTFR-alpha into hematopoietic cells enabled a CNTF response in a system previously sensitive to LIF. Another study obtained responses with CNTF plus soluble alpha receptor. Both depend on available components, not isolated CNTF activity in any cell.
Other names in the literature
- Ciliary neurotrophic factor
An additional component changes model sensitivity
The 1993 CNTFR-alpha study used cells already responding to LIF. Introducing alpha enabled a CNTF response in vitro. This does not establish CNTFR-alpha sufficiency elsewhere: the cells already possessed other signaling components. The initial receptor context is essential (PMID 8381290).
The soluble form also changes the comparison
Another 1993 publication found that initially insensitive cell lines responded to CNTF plus soluble alpha receptor in vitro. That experimental combination is not CNTF alone. It expands questions about receptor availability without predicting every protein-containing formulation (PMID 7681218).
Receptor expression and observed function
Locating CNTFR-alpha in tissue suggests which cells may participate but cannot replace a functional assay. The cited publications combine expression and cellular experiments with different scopes. Distinguish signaling protein, membrane receptor and soluble component before combining findings.
Questions and answers
Is CNTFR-alpha a CNTF variant?
No. It is a receptor-system component, not another ligand form.
Does a soluble-receptor combination demonstrate CNTF-alone activity?
No. The added component forms part of the experimental material that produced the response.
Sources
- The alpha component of the CNTF receptor is required for signaling and defines potential CNTF targets in the adult and during development. — Neuron, 1993
- The alpha component of the CNTF receptor is required for signaling and defines potential CNTF targets in the adult and during development.
- Released form of CNTF receptor alpha component as a soluble mediator of CNTF responses. — Science, 1993
- Released form of CNTF receptor alpha component as a soluble mediator of CNTF responses.