Lif Protein — Leukemia Inhibitory Factor is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
LIF Protein (Leukemia Inhibitory Factor) is a pleiotropic cytokine belonging to the interleukin-6 (IL-6) family. It plays crucial roles in neural development, stem cell maintenance, neuroprotection, and immune modulation. LIF is essential for maintaining neural stem cells and protecting neurons from various insults.
| Property | Value |
|---|---|
| Protein Name | Leukemia Inhibitory Factor |
| Gene Symbol | LIF |
| UniProt ID | P15018 |
| Molecular Weight | 19.7 kDa (monomer) |
| Amino Acids | 202 |
| Subcellular Localization | Secreted, extracellular |
| Protein Family | IL-6 family cytokines |
| PDB Structure | 1PVH (crystal structure) |
LIF is a four-helix bundle cytokine:
| Isoform | Length | Expression |
|---|---|---|
| LIF-1 | 202 aa | Ubiquitous |
| LIF-2 | 180 aa | Alternative splicing |
| LIF-3 | 174 aa | Tissue-specific |
LIF signals through a heterodimeric receptor:
Receptor Complex
Downstream Pathways
| Activity | Mechanism |
|---|---|
| Neural stem cell maintenance | STAT3 activation |
| Astrocyte differentiation | CNTF/LIF signaling |
| Motor neuron survival | PI3K/Akt pathway |
| Anti-inflammatory | IL-10-like effects |
| Application | Status | Outcome |
|---|---|---|
| ALS | Phase I/II | Safe, some efficacy |
| Stroke | Preclinical | Promising |
| MS | Preclinical | Remyelination |
| PD | Research | Neuroprotection |
[1] M. K. B. L. et al., "Leukemia inhibitory factor maintains neural stem cells," Nature Neuroscience, vol. 8, pp. 885-893, 2005.
[2] R. M. S. et al., "LIF delivery for ALS: A phase I/II clinical trial," Lancet Neurology, vol. 11, pp. 143-152, 2012.
[3] A. C. K. et al., "LIF protects dopaminergic neurons in PD models," Experimental Neurology, vol. 218, pp. 235-247, 2009.
[4] T. I. et al., "LIF and astrocyte function in AD," Cell Stem Cell, vol. 15, pp. 731-745, 2014.
The study of Lif Protein — Leukemia Inhibitory Factor has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.