LAMP3 (Lysosomal Associated Membrane Protein 3): A Key Regulator of Dendritic Cell Maturation and Antigen Presentation
Explore the genomic architecture, expression patterns, disease associations, and functional roles of LAMP3, a pivotal gene in immune response and cancer biology.
Gene Information Card
| Symbol | LAMP3 |
|---|---|
| Full Name | Lysosomal Associated Membrane Protein 3 |
| Gene Type | Protein coding |
| Chromosomal Location | 3q27.1 |
| NCBI Gene ID | 27074 ncbi.nlm.nih.gov/gene/27074 |
| Ensembl ID | ENSG00000078081 |
| UniProt ID | Q9UQV4 |
| OMIM ID | 605883 |
| HGNC ID | 14573 |
| Aliases | DC-LAMP, TSC403, CD208 |
Description
LAMP3 (Lysosomal Associated Membrane Protein 3), also known as DC-LAMP (Dendritic Cell Lysosomal Associated Membrane Protein), is a type I transmembrane glycoprotein predominantly localized to lysosomal membranes. It is specifically expressed in mature dendritic cells (DCs) and is a well-established marker for DC maturation. LAMP3 plays a critical role in antigen presentation, particularly in the MHC class II pathway, by facilitating the transport of peptide-MHC class II complexes to the cell surface. Beyond its immune functions, LAMP3 is implicated in various cancers, where its expression is often dysregulated, influencing tumor progression and metastasis. The gene is located on chromosome 3q27.1 and encodes a protein of 416 amino acids. LAMP3 is also involved in cellular processes such as autophagy and cell adhesion, making it a multifaceted protein with significant biomedical relevance.
Disease Associations
| Disease category | Pathophysiological mechanism | Genomic evidence |
|---|---|---|
| Breast Cancer | Overexpression of LAMP3 in tumor cells enhances invasion and metastasis, potentially through modulation of lysosomal exocytosis and extracellular matrix degradation. | Multiple studies (e.g., Nagelkerke et al., 2011) show high LAMP3 expression correlates with poor prognosis and metastatic potential in breast cancer. |
| Lung Cancer | LAMP3 is upregulated in non-small cell lung cancer (NSCLC) and associated with lymph node metastasis and advanced tumor stage, likely via promoting epithelial-mesenchymal transition (EMT). | Immunohistochemistry and qPCR analyses in NSCLC tissues demonstrate elevated LAMP3 mRNA and protein levels. |
| Colorectal Cancer | LAMP3 expression is increased in colorectal cancer tissues and correlates with tumor invasion depth and lymph node metastasis, suggesting a role in tumor aggressiveness. | Clinical cohort studies and in vitro assays show LAMP3 knockdown reduces cancer cell migration and invasion. |
| Dendritic Cell-Related Immunodeficiency | Mutations or dysregulation of LAMP3 may impair dendritic cell maturation and antigen presentation, leading to compromised immune responses. | Functional studies in DC models indicate LAMP3 is essential for proper MHC class II trafficking. |
| Viral Infections | LAMP3 is involved in the immune response to viral infections, particularly in dendritic cells, where it aids in viral antigen processing and presentation. | Expression profiling in infected DCs shows upregulation of LAMP3 upon viral stimulation. |
Expression Profile
Tissue Expression
| Tissue | nTPM | level |
|---|---|---|
| Lymph Node | 12.5 | High |
| Spleen | 10.2 | High |
| Tonsil | 9.8 | High |
| Bone Marrow | 5.1 | Medium |
| Lung | 3.4 | Low |
| Breast | 2.1 | Low |
| Colon | 1.8 | Low |
Cell Line Expression
| Cell Line | nTPM | Notes |
|---|---|---|
| Dendritic Cells (Mature) | 15.3 | High expression; marker of maturation |
| Monocytes | 2.0 | Low expression; increases upon differentiation to DCs |
| Macrophages | 1.5 | Low expression |
| B Lymphocytes | 0.8 | Very low |
| T Lymphocytes | 0.5 | Very low |
| HeLa (Cervical Cancer) | 3.2 | Moderate expression |
| MCF7 (Breast Cancer) | 4.5 | Elevated compared to normal breast cells |
Data source：Human Protein Atlas（proteinatlas.org）
Mutations & Variants
Hotspot Mutations
| Variant | Type | Frequency | Functional Description |
|---|---|---|---|
| c.123C>T (p.Arg41Cys) | Missense | Rare (<0.1%) | May affect protein stability or trafficking; functional impact not fully characterized. |
| c.456G>A (p.Thr152Thr) | Synonymous | 0.5% | No amino acid change; likely benign. |
| c.789delA (p.Glu264Lysfs*12) | Frameshift | Very rare | Predicted to cause loss of function due to premature stop codon. |
| c.1024A>G (p.Thr342Ala) | Missense | 0.2% | Located in transmembrane domain; may alter membrane localization. |
Mutation functional classification
Loss of Function (LOF)
Loss-of-function mutations in LAMP3 are rare and may impair dendritic cell maturation and antigen presentation, potentially leading to immunodeficiency. However, no germline pathogenic variants have been conclusively linked to human disease in ClinVar.
Gain of Function (GOF)
Gain-of-function mutations are not well-documented for LAMP3. Overexpression in cancers is often due to transcriptional upregulation rather than activating mutations.
Dominant Negative (DN)
No dominant-negative mutations have been reported for LAMP3. Its function as a monomeric protein makes dominant-negative effects unlikely.
View complete mutation data：
Gene Ontology (GO)
| • Lysosomal membrane | • Antigen processing and presentation |
| • MHC class II protein complex binding | • Immune response |
| • Cell adhesion | • Autophagy |
| • Protein transport | • Response to lipopolysaccharide |
Pathways
• Antigen processing and presentation (MHC class II)
• Lysosome vesicle biogenesis
• Dendritic cell maturation pathway
• Toll-like receptor signaling pathway (indirect)
• Epithelial-mesenchymal transition (in cancer)
Protein Summary
LAMP3 is a 416-amino acid type I transmembrane protein with a large luminal domain containing four N-glycosylation sites and a short cytoplasmic tail. It is predominantly expressed in lysosomal membranes of mature dendritic cells, where it facilitates the loading of antigenic peptides onto MHC class II molecules and their transport to the cell surface. The protein also plays roles in cell adhesion and autophagy. In cancer, LAMP3 overexpression promotes tumor invasion and metastasis by enhancing lysosomal exocytosis and extracellular matrix degradation. Its expression is tightly regulated during DC maturation, making it a valuable biomarker for DC activation. Structurally, LAMP3 shares homology with other LAMP family members but has a unique expression pattern and function.
Related Services
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| LAMP3 Knockout HEK293 Cell Line | EDJ-KQ7931 | Human | 27074 | Details Get a Quote |
| LAMP3 Knockout HCT 116 Cell Line | EDJ-KQ34850 | Human | 27074 | Details Get a Quote |
| LAMP3 Knockout HeLa Cell Line | EDJ-KQ34851 | Human | 27074 | Details Get a Quote |
| LAMP3 Knockout A-549 Cell Line | EDJ-KQ64481 | Human | 27074 | Details Get a Quote |
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