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Dendritic cell/lymphocyte clustering: morphologic analysis by transmission electron microscopy and distribution of
C M Setum1, J R Serie, O D Hegre
1Department of Cell Biology and Neuroanatomy, University of Minnesota, Minneapolis.
Insights
Dendritic cells (DCs) form clusters during immune responses. Their surface molecules, like major histocompatibility complex class II antigens, show specific distribution patterns within these clusters, suggesting a role for the cytoskeleton.
Area of Science:
- Immunology
- Cell Biology
- Microscopy
Background:
- Dendritic cells (DCs) are crucial antigen-presenting cells.
- DC clustering is observed during immune responses and may be vital for lymphocyte activation.
- The precise mechanisms of DC function remain incompletely understood.
Purpose of the Study:
- To investigate the ultrastructure of dendritic cell clusters.
- To examine the surface distribution of major histocompatibility complex class II (MHC II) antigens on clustering DCs.
- To elucidate the role of DC morphology in their antigen-presenting function.
Main Methods:
- Enriched rat splenic dendritic cells (DCs) were cultured.
- Ultrastructural examination using scanning electron microscopy was performed.
- Immunogold labeling with 10 nm particles was used to visualize MHC class II antigen distribution.
Main Results:
- DCs formed distinct clusters with lymphocytes and macrophages.
- DCs exhibited characteristic dendritic processes and occasional large vacuoles.
- MHC class II antigens showed differential surface distribution, often in linear arrays and clusters.
- This distribution suggests a role for the cytoskeleton in MHC II antigen recycling and redistribution.
Conclusions:
- Ultrastructural analysis provides insights into DC clustering and morphology.
- The observed distribution of MHC class II antigens implies cytoskeletal involvement in their dynamic regulation.
- These findings contribute to understanding the fundamental biology and antigen-presenting mechanisms of DCs.
Abstract:
Dendritic cells (DCs) are potent antigen-presenting cells for a variety of immune responses; however, their mechanism of action has not been established. It is known that DCs can cluster with one another and with other cell types during in vitro immune responses, and clustering may be essential for the activation of resting lymphocytes. In this study, ultrastructural examination of clusters that form during extended culture of enriched rat splenic DCs (approximately 70% DCs) is reported. DCs were readily distinguished from other cell types, which included lymphocytes and macrophages. DCs displayed characteristic veils and/or dendritic processes that intertwined with processes of other cells within the cluster, or extended from the cluster periphery. Occasional DCs contained large vacuoles lined with small vesicles. A paramount feature of DCs is their constitutive expression of high levels of surface major histocompatibility complex class II antigens. The surface distribution of class II antigens on clustering DCs was examined using 10 nm immunogold labeling techniques and high-resolution scanning electron microscopy. DCs were readily distinguished by morphologic criteria, and examination of various surface membrane regions revealed a differential distribution of class II antigens. Gold label was frequently distributed in linear arrays and clusters, suggesting a cytoskeletal role in the recycling/redistribution of Class II antigens. These morphologic findings further an understanding of basic DC biology and their mechanism of action as antigen-presenting cells.
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