CNTF is a pleiotropic cytokine and member of the IL-6 cytokine family 1 that functions primarily as a survival factor for diverse neuronal cell types, including sensory, sympathetic, and motor neurons 2. The protein is not secreted via the classical endoplasmic reticulum-Golgi pathway but accumulates in the cytoplasm of myelinating Schwann cells and astrocytes 2. Mechanistically, CNTF signals through a receptor complex containing gp130 and activates JAK2/STAT3 and ERK1/2 pathways 34. In the retina, CNTF demonstrates robust neuroprotective effects, promoting both rod and cone photoreceptor survival and regeneration in degenerative models 5. CNTF also supports retinal ganglion cell survival and axon regeneration 5. Beyond photoreceptor protection, CNTF enhances retinal pigment epithelium survival, modulates polarized cytokine secretion, and increases fluid absorption through CFTR channel activation 3. Clinical relevance extends to retinal degenerative diseases, with ongoing trials investigating CNTF implants for achromatopsia patients with CNGB3 mutations 6. Emerging evidence suggests CNTF also regulates vascular function through JAK2/STAT3-dependent mechanisms in angiotensin II-induced hypertension 4. Despite these neuroprotective roles, CNTF is dispensable for embryonic development, with knockout mice showing postnatal motor neuron loss specifically 2.