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Stable expression of CD1a molecule in human epithelial cell lines shows temperature-dependent expression and affects
R C Yu1, E Kolettas, T Kamalati
1Unit of Dermatology, Royal Postgraduate Medical School, London, UK.
Insights
Expressing the human CD1a molecule in epithelial cells slowed growth and altered cell morphology. Lower temperatures significantly boosted CD1a expression, suggesting implications for Langerhans cell research.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Human CD1a is a transmembrane protein structurally similar to HLA class I molecules.
- CD1a has limited tissue distribution and serves as a diagnostic marker for conditions like Langerhans cell histiocytosis.
Purpose of the Study:
- To investigate the functional role of the CD1a molecule in cellular processes.
- To establish human epithelial cell lines stably expressing CD1a.
Main Methods:
- Cloning of CD1a cDNA into eukaryotic expression vectors.
- Retroviral-mediated gene transfer and DNA transfection to create stable cell lines (HaCaT and HeLa).
- Confirmation of CD1a expression and localization using Northern blot and immunofluorescence.
Main Results:
- Stable CD1a expression in HeLa and HaCaT cells led to increased doubling times and altered cell morphology in up to 20% of cells.
- Clonogenicity experiments showed reduced colony size and augmented plating efficiency in CD1a-positive cells.
- Lower temperatures significantly enhanced CD1a protein and mRNA expression in a time-dependent manner.
Conclusions:
- CD1a expression may function as a negative growth regulator in epithelial cells in vitro.
- Enhanced CD1a expression at lower temperatures has potential implications for studying Langerhans cells in vitro, considering physiological skin temperatures.
Abstract:
The human CD1a molecule is a transmembrane protein which shares structural similarities with HLA class I molecules. It has restricted tissue distribution in normal individuals, and is a useful diagnostic marker for certain disease states such as Langerhans cell histiocytosis. In order to investigate the function of this molecule, a cDNA fragment encoding the CD1a molecule was cloned into several EUKARYOTIC expression vectors which were then used to establish human epithelial cell lines stably expressing the membrane-bound CD1a molecule. Human keratinocytes (HaCaT) and epithelial cells (HeLa) stably expressing CD1a were established by retroviral-mediated gene transfer and DNA transfection, respectively. Expression and localization of the CD1A molecule were then confirmed by Northern blot analysis and immunofluorescence methods. CD1a expression appears to have profound effects on cellular growth and morphology. Both stably CD1a-expressing HeLa and HaCaT cells showed increased doubling times, and up to 20% of CD1a-expressing cells showed altered cell morphology. Clonogenicity experiments demonstrated a reduction in colony size and plating efficiency was augmented in CD1a-positive cells when compared with vector-transfected/infected controls. Our findings suggest that CD1A expression may act as a negative growth regulator in these cells in vitro. Furthermore, lower temperatures greatly enhanced the expression of CD1a at both the protein and mRNA levels in a time-dependent fashion. Since the physiological skin temperatures lie well below the core temperature, this observation may have important implications in the study of Langerhans cells in vitro.
