Apolipoprotein D is a protein that in the nervous system, apod is expressed primarily by oligodendrocytes and astrocytes:. This page describes its structure, normal nervous system function, role in neurodegenerative disease, and potential as a therapeutic target.
Apolipoprotein D (ApoD) is a member of the lipocalin family of transport proteins that plays important roles in lipid metabolism and neuroprotection in the central nervous system [1]. [1]
| Property | Value | [2]
|----------|-------| [3]
| Gene | APOD | [4]
| UniProt ID | P05090 | [5]
| Molecular Weight | 19 kDa |
| Subcellular Localization | Secreted, associated with HDL particles |
| Protein Family | Lipocalin family |
ApoD is a glycoprotein with a characteristic β-barrel structure typical of lipocalins [2]. The protein binds small hydrophobic ligands including retinol, progesterone, and bilirubin. Its three-dimensional structure consists of an eight-stranded antiparallel β-barrel forming a central ligand-binding pocket.
In the nervous system, ApoD is expressed primarily by oligodendrocytes and astrocytes:
ApoD levels are significantly upregulated in AD brain tissue, particularly in regions affected by neurodegeneration [4]. Elevated cerebrospinal fluid (CSF) ApoD levels correlate with disease progression. May represent a compensatory neuroprotective response to amyloid pathology. Genetic variants of APOD have been associated with increased AD risk in some populations.
Increased ApoD expression observed in substantia nigra of PD patients [5]. Associated with Lewy body formation and dopaminergic neuron degeneration. May play a role in α-synuclein aggregation through lipid interaction.
ApoD represents a potential therapeutic target:
| Partner | Interaction Type | Function |
|---|---|---|
| HDL particles | Structural component | Lipid transport |
| α-Synuclein | Protein binding | Modulates aggregation |
| Aβ peptides | Binding | May influence amyloid pathology |
| Retinol | Ligand binding | Vitamin A transport |
Apolipoprotein D: a multifunctional apolipoprotein implicated in Alzheimer's disease (Frontiers in Aging Neuroscience, 2021). 2021. ↩︎
ApoD structure and ligand binding (Journal of Lipid Research, 2018). 2018. ↩︎
ApoD antioxidant properties (Free Radical Biology & Medicine, 2017). 2017. ↩︎
Apolipoprotein D in Alzheimer's disease (Journal of Alzheimer's Disease, 2015). 2015. ↩︎
Apolipoprotein D in Parkinson's disease (Neurobiology of Disease, 2018). 2018. ↩︎