Human CD55 ELISA Matched Antibody Pair (ABPR-0176)

Regulatory status: For research use only, not for use in diagnostic procedures.

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Species Reactivity
Intended Use
This antibody pair set comes with matched antibody pair to detect and quantify protein level of human CD55.
General Description
This gene encodes a protein involved in the regulation of the complement cascade. The encoded glycoprotein is also known as the decay-accelerating factor (DAF); binding of DAF to complement proteins accelerates their decay, disrupting the cascade and preventing damage to host cells. Antigens present on the DAF glycoprotein constitute the Cromer blood group system (CROM). Two alternatively spliced transcripts encoding different proteins have been identified. The predominant transcript encodes a membrane-bound protein expressed on cells exposed to plasma component proteins but an alternatively spliced transcript produces a soluble protein present at much lower levels. Additional, alternatively spliced transcript variants have been described, but their biological validity has not been determined.
Reconstitution And Storage
Store reagents of the antibody pair set at -20°C or lower. Please aliquot to avoid repeated freeze thaw cycle. Reagents should be returned to -20°C storage immediately after use.


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Contradictory Role of CD97 in Basal and Tumor Necrosis Factor-Induced Osteoclastogenesis In Vivo


Authors: Won, Hee Yeon; Mun, Se Hwan; Shin, Bongjin; Lee, Sun-Kyeong

Objective. CD97, a member of the 7-trans-membrane epidermal growth factor family of adhesion G protein-coupled receptors, is expressed on various cell types. This study was undertaken to elucidate the functions of CD97 in bone and inflammation in an experimental mouse model, by examining the effect of CD97 on osteoclastogenesis in vitro, characterizing the skeletal phenotype of CD97-deficient (CD97-knockout [KO]) mice, and assessing the responses to tumor necrosis factor (TNF) treatment. Methods. Femoral tissue and bone marrow (BM)-derived cells from CD97-KO and wild-type (WT) mice were assessed using histomorphometric analyses, in vitro cultures, and reverse transcription-polymerase chain reaction. Serum cytokine and chemokine levels in the presence or absence of TNF challenge were analyzed by multiplex assay. Results. In cultures of mouse BM-derived macrophages in vitro, RANKL induced the expression of CD97. In vivo, the trabecular bone volume of the femurs of female CD97-KO mice was increased, and this was associated with a decrease in the number of osteoclasts. Compared to WT mice, CD97-KO mice had a reduced potential to form osteoclast-like cells in vitro. Furthermore, TNF treatment augmented the formation of osteoclasts in the calvaria of CD97-KO mice in vivo, by increasing the production of RANKL and other cytokines and chemokines and by reducing the production of osteoprotegerin by calvarial cells. Conclusion. These findings demonstrate that CD97 is a positive regulator of osteoclast-like cell differentiation, a mechanism that influences bone homeostasis. However, the presence of CD97 may be essential to suppress the initial osteoclastogenesis that occurs in response to acute and local inflammatory stimuli.

Identification of a CD133-CD55-population functions as a fetal common skeletal progenitor


Authors: Weng, Lihong; Hu, Xingbin; Kumar, Bijender; Garcia, Mayra; Todorov, Ivan; Jung, Xiaoman; Marcucci, Guido; Forman, Stephen J.; Chen, Ching-Cheng

In this study, we identified a CD105+CD90.1-CD133-CD55-(CD133-CD55-) population in the fetal skeletal element that can generate bone and bone marrow. Besides osteoblasts and chondrocytes, the CD133-CD55- common progenitors can give rise to marrow reticular stromal cells and perivascular mesenchymal progenitors suggesting they function as the fetal common skeletal progenitor. Suppression of CXCL12 and Kitl expression in CD133-CD55- common progenitors severely disrupted the BM niche formation but not bone generation. Thus, CD133-CD55- common progenitors are the main source of CXCL12 and Kitl producing cells in the developing marrow.

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