A novel monoclonal antibody, RM-4, specifically recognizes rat macrophages and dendritic cells in formalin-fixed, paraffin- embedded tissues
Tóm tắt
An anti-rat macrophage/dendritic cell monoclonal antibody, RM-4, was produced using a homogenate of silica-induced lung granulomas of rat as immunogen. Immunohistochemistry demonstrated that RM-4 was specific for macrophage and dendritic cell populations residing in various organs and tissues. It did not react with any cells other than macrophage/dendritic cells. In the double staining of the spleen, RM-4-positive macrophages showed wider distribution than those of the four other anti-rat macrophage monoclonal antibodies compared. The immunoreactivity of RM-4 was well preserved not only in frozen sections but also in formalin-fixed, paraffin-embedded tissues. The isotype of the monoclonal antibody was IgG1 kappa and its antigen molecular weight was 46 kDa. Immunoelectron microscopy revealed positive reaction products for RM-4 on the membrane of endosomes and lysosomes in macrophages and epidermal Langerhans cells. Reaction intensity increased after thioglycolate elicitation or endocytosis regardless of ingested materials. From these data, it is concluded that RM-4 recognizes a membrane protein of endolysomes in macrophages and dendritic cells. The antigen may play a role in endolysosomal processing. RM-4 is considered to be a useful tool not only for identifying macrophage/dendritic cells both in frozen and paraffin-embedded tissues, but also for evaluating their endolysosomal processing.
Tài liệu tham khảo
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