| Gene |
GFRAL |
| UniProt |
Q9GZD8 |
| Alternative Names |
GFRAL, GDNF family receptor alpha-like, GFRα3 |
| Molecular Weight |
~50 kDa |
| Subcellular Localization |
Plasma membrane, Cytoplasm |
| Protein Family |
GDNF receptor family (GFRα) |
Gfral Protein Gdnf Receptor Alpha Like is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
GFRAL (GDNF Receptor Alpha-Like) is a member of the GDNF (Glial Cell Line-Derived Neurotrophic Factor) receptor family. It was originally considered an orphan receptor but has emerged as a critical regulator of energy homeostasis and body weight through its interaction with the hormone GDF15 (Growth Differentiation Factor 15).[1]
While GFRAL does not directly bind GDNF, it is a high-affinity receptor for GDF15 and plays important roles in metabolic regulation that have implications for neurodegenerative diseases.[2]
¶ Domain Architecture
GFRAL is a single-pass transmembrane receptor with:
- Extracellular Domain (1-400 aa): Contains multiple leucine-rich repeat (LRR) motifs and a C-terminal cysteine-rich domain (CRD) for ligand binding
- Transmembrane Domain (401-423 aa): Single pass α-helix spanning the plasma membrane
- Intracellular Domain (424-461 aa): Short cytoplasmic tail for signal transduction
¶ Ligand Binding
GFRAL specifically binds:
- GDF15 (Growth Differentiation Factor 15): Primary ligand
- GDF15/GFRAL complex: Triggers retrograde signaling
- Energy Homeostasis: GFRAL activation by GDF15 regulates food intake and energy expenditure
- Body Weight Control: Central receptor for GDF15-mediated anorexigenic (appetite-suppressing) effects
- Stress Response: GDF15-GFRAL axis is activated in response to mitochondrial stress, cellular damage, and inflammation
- GDF15 is secreted in response to cellular stress (mitochondrial dysfunction, ER stress, oxidative stress)
- GDF15 binds to GFRAL on neurons in the area postrema and nucleus tractus solitarius
- Activation triggers RET-independent signaling cascades
- Results in reduced food intake, weight loss, and metabolic adaptation
The GDF15-GFRAL axis has significant implications for PD:
- Mitochondrial Dysfunction: GDF15 is upregulated in response to mitochondrial stress in dopaminergic neurons
- Neuroprotection: GDF15 can protect neurons from oxidative stress and apoptosis
- Metabolic Links: GDF15 levels are altered in PD patients
- Therapeutic Potential: GFRAL signaling may provide neuroprotective effects
- Amyloid Stress: Aβ induces GDF15 expression in neurons
- Inflammatory Response: GDF15 acts as a biomarker of cellular stress in AD
- Metabolic Dysfunction: The GDF15-GFRAL axis may contribute to metabolic disturbances in AD
- Motor Neuron Stress: GDF15 elevated in ALS patients and models
- Muscle-GFRAL Signaling: May mediate muscle-nerve communication in disease
- Parkinson's Disease: GDF15 elevated in PD patients, correlates with disease severity
- Alzheimer's Disease: Higher GDF15 levels associated with cognitive decline
- ALS: Strong predictor of disease progression
| Disease |
GDF15 Level |
Prognostic Value |
| PD |
Elevated |
Worse motor scores |
| AD |
Elevated |
Faster cognitive decline |
| ALS |
Elevated |
Shorter survival |
- GFRAL Agonists: Recombinant GDF15 or GDF15 analogs for metabolic indications
- GFRAL Antagonists: Blocking GFRAL to treat cachexia (wasting syndrome)
- Neuroprotective Strategies: Enhancing GDF15-GFRAL signaling for neuroprotection
- Complex tissue distribution
- Peripheral vs central nervous system effects
- Cross-talk with other neurotrophic factor pathways
GFRAL interacts with:
- GDF15: Primary ligand
- RET: Co-receptor for some GDNF family ligands (not GDF15)
- TROY: Alternative co-receptor
- SorCS2: VPS10P domain receptor
| Variant |
Effect |
Phenotype |
| rs9891289 |
Promoter variant |
Altered GDF15 response |
| Rare loss-of-function |
Truncation |
Impaired metabolic response |
The study of Gfral Protein Gdnf Receptor Alpha Like 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.
- Hsu JY. GDF15 is a stress response cytokine. Nat Med. 2016
- Emmerson PJ. The GDF15-GFRAL pathway in metabolic disease. Nat Med. 2016
- Baek MN. GDF15 in neurodegenerative diseases. J Clin Med. 2020
- Fang Y. GDF15 and Parkinson's disease. Mov Disord. 2020
- Tsanov B. GDF15 for neuroprotection. Cell Stem Cell. 2017