Cellular Pathway(S) of Antigen Processing and Presentation in Fish APC: Endosomal Involvement and Cell-Free Antigen Presentation
| Autor: | Gregory W. Warr, Marvin A. Cuchens, Abbe N. Vallejo, L. William Clem, Nancy E. Harvey, Norman W. Miller |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Endosome
Immunology Antigen presentation Antigen-Presenting Cells Biology Endocytosis Flow cytometry Immune system Antigen medicine Animals Antigen-presenting cell endosome Cells Cultured Organelles medicine.diagnostic_test Antigen processing Flow Cytometry Molecular biology APC Cell biology Ictaluridae antigen presentation catfish Research Article Developmental Biology |
| Zdroj: | Developmental Immunology |
| ISSN: | 1044-6672 |
| DOI: | 10.1155/1992/82525 |
| Popis: | Studies were conducted to address further the role(s) of antigen processing and presentation in the induction of immune responses in a phylogenetically lower vertebrate, specifically a teleost, the channel catfish. In particular, studies were aimed at determining the subcellular compartments involved in antigen degradation by channel catfish antigen-presenting cells (APC) as well as ascertaining the reexpression of immunogenic peptides on the surfaces of APC. The results showed that exogenous protein antigens were actively endocytosed by APC as detected by flow cytometry. Use of radiolabeled antigen and subcellular fractionation protocols also showed that antigen localized in endosomes/lysosomes. Furthermore, there was an apparent redistribution of antigen between these organelles and the plasma membrane during the course of antigen pulsing. Functional assays for the induction ofin vitroantigen-specific proliferation of immune catfish peripheral blood leukocytes (PBL) showed that membrane preparations from antigen-pulsed autologous APC were highly stimulatory. The magnitude of responses elicited with such membrane preparations was very similar to that of PBL cultures stimulated with native antigen-pulsed and fixed intact APC or prefixed intact APC incubated with a peptide fragment of the nominal antigen. Current data further corroborate our previous findings that steps akin to antigen processing and presentation are clearly important in the induction of immune responses in lower vertebrates like fish, in a manner similar to that seen in mammalian systems. Consequently, it would appear that many immune functions among the diverse taxa of vertebrates are remarkably conserved. |
| Databáze: | OpenAIRE |
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