GO:0097209 epidermal lamellar body: Components, Assembly and Research Methods, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0097209 epidermal lamellar body is a specialized secretory organelle in keratinocytes that is essential for forming the skin's water barrier.
• Lamellar bodies contain lipids, ceramides, and hydrolytic enzymes that are secreted into the intercellular space of the stratum corneum to form impermeable lipid membranes.
• Defects in lamellar body biogenesis or secretion are linked to skin barrier disorders such as atopic dermatitis and ichthyosis.
• Key proteins involved include ABCA12, SDR9C7, and various ceramide synthases, which are critical for lipid processing and transport.
• Research on lamellar bodies uses knockout, knock-in, and overexpression models to dissect gene function in barrier formation.
• CRISPR-based screens and bioinformatics are powerful tools to identify novel regulators of lamellar body biology.
Description
The epidermal lamellar body (GO:0097209) is a unique secretory organelle found in keratinocytes of the epidermis, responsible for delivering lipids and enzymes to the extracellular space to form the skin's permeability barrier. This organelle is critical for preventing water loss and protecting against environmental insults, and its dysfunction is associated with common skin diseases such as atopic dermatitis and ichthyosis. Understanding the biogenesis, composition, and regulation of lamellar bodies is therefore of great interest to dermatology and barrier biology researchers. Recent studies have begun to elucidate the molecular machinery controlling lamellar body formation, including roles for Golgi and lysosomal pathways. This article provides a comprehensive overview of GO:0097209, integrating authoritative GO definitions with published literature to support research and drug discovery.
epidermal lamellar body At A Glance
| GO ID | GO:0097209 |
|---|---|
| GO term | epidermal lamellar body |
| Ontology | cellular_component |
| Synonym | None |
| Major function | Secretion of lipids and enzymes to form the skin's water barrier |
| Cellular location | Cytoplasm of keratinocytes, particularly in the stratum granulosum |
| Composition | Lipids, ceramides, hydrolytic enzymes, and structural proteins |
| Associated diseases | Atopic dermatitis, ichthyosis, and other barrier disorders |
What Is GO:0097209?
According to the Gene Ontology, epidermal lamellar body (GO:0097209) is a specialized secretory organelle found in keratinocytes and involved in the formation of an impermeable, lipid-containing membrane that serves as a water barrier and is required for correct skin barrier function.
Why Is epidermal lamellar body Important in Cell Biology?
The epidermal lamellar body is central to skin barrier function, and its dysfunction leads to increased water loss and susceptibility to infections and allergens. Research on lamellar bodies informs the development of therapies for skin diseases and cosmetics aimed at barrier repair.
• Maintains skin hydration by forming lipid lamellae in the stratum corneum.
• Protects against environmental pathogens and allergens.
• Dysfunction is linked to atopic dermatitis and ichthyosis.
• Target for therapeutic interventions in barrier repair.
• Involved in epidermal differentiation and homeostasis.
• Key model for studying secretory organelle biogenesis.
• Relevant to cosmetic and pharmaceutical development.
• Provides insights into lipid metabolism and transport.
What Happens During epidermal lamellar body?
Biogenesis and Cargo Packaging
In simple terms: The cell builds lamellar bodies by packing lipids and enzymes into small vesicles.
Lamellar bodies originate from the Golgi apparatus and trans-Golgi network, where lipids and proteins are sorted and packaged into secretory vesicles. This process involves the coordination of lipid synthesis, including ceramides and cholesterol, and the recruitment of hydrolytic enzymes such as glucocerebrosidase. The Golgi and lysosomal pathways play essential roles in lamellar body biogenesis, as highlighted by recent studies.
Transport and Secretion
In simple terms: The lamellar body moves to the cell surface and releases its contents outside.
After formation, lamellar bodies are transported to the apical plasma membrane of keratinocytes, where they fuse and secrete their lipid and enzyme contents into the intercellular space between the stratum granulosum and stratum corneum. This secretion is triggered by calcium influx and other signals associated with terminal differentiation.
Extracellular Lipid Processing
In simple terms: Once outside, the lipids are modified to form a waterproof barrier.
Secreted lipids, including ceramides, fatty acids, and cholesterol, undergo enzymatic processing by enzymes such as beta-glucocerebrosidase and acid sphingomyelinase to form mature ceramides. These lipids then organize into lamellar sheets that fill the intercellular spaces of the stratum corneum, creating the permeability barrier.
Barrier Formation and Maintenance
In simple terms: The organized lipids block water loss and keep harmful substances out.
The lipid lamellae formed from lamellar body contents are essential for the skin's barrier function, preventing transepidermal water loss and entry of pathogens. Defects in this process lead to barrier impairment, as seen in atopic dermatitis and ichthyosis.
Key Genes Involved in GO:0097209 epidermal lamellar body
The following genes and proteins are critically involved in the biogenesis, function, and regulation of the epidermal lamellar body.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ABCA12 | Lipid transporter in lamellar bodies | Mutations cause harlequin ichthyosis; key for lipid transport |
| SDR9C7 | Ceramide synthesis | Defects linked to ichthyosis; involved in lipid processing |
| GBA | Glucocerebrosidase; ceramide production | Enzyme in lamellar bodies; mutations cause Gaucher disease with skin barrier defects |
| SMPD1 | Acid sphingomyelinase; ceramide generation | Deficiency leads to Niemann-Pick disease with barrier abnormalities |
| CERS3 | Ceramide synthase | Essential for skin barrier; mutations cause ichthyosis |
| ELOVL4 | Fatty acid elongation | Involved in very long-chain fatty acid synthesis for ceramides |
| PNPLA1 | Lipid hydrolase | Mutations cause ichthyosis; role in lamellar body lipid processing |
| CLDN1 | Tight junction protein | Regulates paracellular barrier; interacts with lamellar body secretion |
| KRT1 | Keratin 1 | Structural protein in keratinocytes; mutations affect barrier |
| KRT10 | Keratin 10 | Partner of KRT1; epidermal differentiation marker |
| LOR | Loricrin | Cornified envelope protein; crosslinked with lipids |
| IVL | Involucrin | Cornified envelope precursor; involved in barrier formation |
| FLG | Filaggrin | Essential for skin barrier; mutations linked to atopic dermatitis |
| TGM1 | Transglutaminase 1 | Crosslinks cornified envelope proteins; mutations cause ichthyosis |
| SPTLC1 | Serine palmitoyltransferase | First step in sphingolipid synthesis; relevant to ceramide production |
| SPTLC2 | Serine palmitoyltransferase | Partner of SPTLC1; involved in sphingolipid synthesis |
| DEGS1 | Dihydroceramide desaturase | Ceramide synthesis; affects barrier lipids |
| UGT8 | Galactosylceramide synthase | Lipid metabolism; potential role in barrier |
How Is epidermal lamellar body Regulated?
The biogenesis and secretion of epidermal lamellar bodies are regulated by calcium signaling, transcription factors such as PPARs and LXR, and lipid-sensing pathways. For example, PPAR activation enhances lamellar body secretion and barrier recovery. Additionally, the Golgi and lysosomal pathways are critical for proper lamellar body formation, as disruption leads to defective barrier function.
epidermal lamellar body and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ABCA12 | Harlequin ichthyosis | Knockout keratinocytes; point mutation knock-in mice |
| FLG | Atopic dermatitis | Knockout mice; overexpression in keratinocytes |
| SDR9C7 | Ichthyosis | Knockout cell models; lipid analysis |
| CERS3 | Ichthyosis | Knockout mice; ceramide profiling |
| PNPLA1 | Ichthyosis | Knockout models; lipidomics |
Atopic Dermatitis
Atopic dermatitis is characterized by skin barrier dysfunction, often involving reduced lamellar body secretion and altered lipid composition. Studies have shown that exosomes from mesenchymal stem cells can promote ceramide synthesis and improve barrier repair in atopic dermatitis models.
Ichthyosis
Harlequin ichthyosis and other forms of ichthyosis are caused by mutations in genes such as ABCA12, leading to defective lamellar body formation and severe barrier impairment.
Essential Fatty Acid Deficiency
Essential fatty acid deficiency results in reduced lamellar body content and altered fatty acid composition of epidermal ceramides, leading to barrier dysfunction.
From epidermal lamellar body-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Role of ABCA12 in lamellar body formation | ABCA12 knockout keratinocytes |
| Effect of FLG mutations on barrier function | FLG point mutation knock-in mice |
| Ceramide synthesis regulation | CERS3 overexpression in keratinocytes |
| Lipid transport mechanisms | Tagged ABCA12 knock-in for imaging |
| Barrier repair by stem cell exosomes | Atopic dermatitis mouse model treated with exosomes |
| Essential fatty acid deficiency | Guinea pig model with borage oil supplementation |
How to Study the epidermal lamellar body Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Electron microscopy | Lamellar body ultrastructure | Visualization of secretion and lipid organization |
| Immunofluorescence | Protein localization | Co-localization with lamellar body markers |
| Lipidomics | Lipid composition | Ceramide and fatty acid profiling |
| Proteomics | Protein content | Identification of lamellar body proteins |
| TEWL measurement | Barrier function | Assessment of skin permeability |
| CRISPR screening | Gene function | Identification of novel regulators |
| RNA-seq | Gene expression | Transcriptional profiling of keratinocytes |
| Western blot | Protein expression | Validation of knockout/overexpression |
Imaging Techniques
Electron microscopy and immunofluorescence are used to visualize lamellar body structure and secretion in keratinocytes.
Lipidomics and Proteomics
Mass spectrometry-based lipidomics and proteomics can profile the lipid and protein composition of lamellar bodies and stratum corneum.
Genetic Models
Knockout and transgenic mouse models, as well as CRISPR-edited cell lines, are used to study gene function in lamellar body biology.
Functional Barrier Assays
Transepidermal water loss measurements and permeability assays assess barrier function in vivo and in vitro.
How CRISPR Can Be Used to Study GO:0097209 epidermal lamellar body
Knockout
CRISPR knockout of genes such as ABCA12 or CERS3 in keratinocytes or mice can model ichthyosis and reveal essential roles in lamellar body formation.
Point Mutation
Introducing disease-associated point mutations (e.g., in FLG or SDR9C7) allows study of specific functional defects in barrier formation.
Knock-in
Knock-in of tagged proteins (e.g., GFP-ABCA12) enables live imaging and tracking of lamellar body dynamics.
Overexpression
Overexpression of lipid synthesis enzymes (e.g., CERS3) can enhance ceramide production and improve barrier function in models.
How EDITGENE Supports epidermal lamellar body Research
Researchers studying epidermal lamellar body-related genes often need to determine whether a candidate gene is causally involved in barrier formation and skin disease. EDITGENE provides comprehensive CRISPR-based services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for epidermal lamellar body research.
Frequently Asked Questions About epidermal lamellar body
What is an epidermal lamellar body?
It is a specialized secretory organelle in keratinocytes that releases lipids to form the skin's water barrier.
What genes are involved in epidermal lamellar body formation?
Key genes include ABCA12, SDR9C7, CERS3, and FLG, among others.
What diseases are associated with lamellar body dysfunction?
Atopic dermatitis, ichthyosis, and essential fatty acid deficiency are linked to lamellar body defects.
How can I study epidermal lamellar bodies?
Using electron microscopy, lipidomics, and CRISPR-edited cell models.
What is the role of ABCA12 in lamellar bodies?
ABCA12 transports lipids into lamellar bodies; mutations cause harlequin ichthyosis.
Can CRISPR be used to model lamellar body diseases?
Yes, knockout and knock-in models in keratinocytes or mice are widely used.
What lipids are found in lamellar bodies?
Ceramides, cholesterol, and free fatty acids are major components.
How does the lamellar body contribute to skin barrier?
It secretes lipids that form lamellar sheets, preventing water loss.
What is the difference between lamellar bodies and lamellar granules?
They are the same organelle; lamellar granule is an older synonym.
Are there treatments targeting lamellar bodies?
Barrier repair therapies and exosome treatments aim to restore lamellar body function.
Conclusion
The epidermal lamellar body (GO:0097209) is a critical organelle for skin barrier function, with broad implications for dermatological health and disease. Continued research using advanced CRISPR models and multi-omics approaches will further unravel its biogenesis and regulation, paving the way for novel therapies.
References
- 1. Mahanty S et al.. 2021. Epidermal Lamellar Body Biogenesis: Insight Into the Roles of Golgi and Lysosomes.. Front Cell Dev Biol 9:701950 PMID: 34458262
- 2. Wertz P. 2018. Epidermal Lamellar Granules.. Skin Pharmacol Physiol 31(5):262-268 PMID: 30110701
- 3. Coderch L et al.. 2003. Ceramides and skin function.. Am J Clin Dermatol 4(2):107-29 PMID: 12553851
- 4. Fartasch M. 2004. The epidermal lamellar body: a fascinating secretory organelle.. J Invest Dermatol 122(5):XI-XII PMID: 15140249
- 5. Madison KC. 2003. Barrier function of the skin: "la raison d'être" of the epidermis.. J Invest Dermatol 121(2):231-41 PMID: 12880413
- 6. van Smeden J et al.. 2016. Stratum Corneum Lipids: Their Role for the Skin Barrier Function in Healthy Subjects and Atopic Dermatitis Patients.. Curr Probl Dermatol 49:8-26 PMID: 26844894
- 7. Shin KO et al.. 2020. Exosomes from Human Adipose Tissue-Derived Mesenchymal Stem Cells Promote Epidermal Barrier Repair by Inducing de Novo Synthesis of Ceramides in Atopic Dermatitis.. Cells 9(3) PMID: 32164386
- 8. Kim KP et al.. 2021. Borage Oil Enhances Lamellar Body Content and Alters Fatty Acid Composition of Epidermal Ceramides in Essential Fatty Acid-Deficient Guinea Pigs.. Lipids 56(3):345-353 PMID: 33378788
