Developmental, malignancy-related, and cross-species analysis of eosinophil, mast cell, and basophil siglec-8 expression
SA Hudson, H Herrmann, J Du, P Cox… - Journal of clinical …, 2011 - Springer
SA Hudson, H Herrmann, J Du, P Cox, EB Haddad, B Butler, PR Crocker, SJ Ackerman…
Journal of clinical immunology, 2011•SpringerObjective The aim of this study is to determine when during hematopoiesis Siglec-8 gets
expressed, whether it is expressed on hematologic malignancies, and if there are other non-
human species that express Siglec-8. Methods Siglec-8 mRNA and cell surface expression
was monitored during in vitro maturation of human eosinophils and mast cells. Flow
cytometry was performed on human blood and bone marrow samples, and on blood
samples from dogs, baboons, and rhesus and cynomolgus monkeys. Results Siglec-8 is a …
expressed, whether it is expressed on hematologic malignancies, and if there are other non-
human species that express Siglec-8. Methods Siglec-8 mRNA and cell surface expression
was monitored during in vitro maturation of human eosinophils and mast cells. Flow
cytometry was performed on human blood and bone marrow samples, and on blood
samples from dogs, baboons, and rhesus and cynomolgus monkeys. Results Siglec-8 is a …
Objective
The aim of this study is to determine when during hematopoiesis Siglec-8 gets expressed, whether it is expressed on hematologic malignancies, and if there are other non-human species that express Siglec-8.
Methods
Siglec-8 mRNA and cell surface expression was monitored during in vitro maturation of human eosinophils and mast cells. Flow cytometry was performed on human blood and bone marrow samples, and on blood samples from dogs, baboons, and rhesus and cynomolgus monkeys.
Results
Siglec-8 is a late maturation marker. It is detectable on eosinophils and basophils from subjects with chronic eosinophilic leukemia, chronic myelogenous leukemia, and on malignant and non-malignant bone marrow mast cells, as well as the HMC-1.2 cell line. None of the Siglec-8 monoclonal antibodies tested recognized leukocytes from dogs, baboons, and rhesus and cynomolgus monkeys.
Conclusions
Siglec-8-based therapies should not target immature human leukocytes but should recognize mature and malignant eosinophils, mast cells, and basophils. So far, there is no suitable species for preclinical testing of Siglec-8 monoclonal antibodies.
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