RAGE controls leukocyte adhesion in preterm and term infants

Autor: David Frommhold, Raphaela Tschada, Johannes Poeschl, Hannes Hudalla, Natascha Braach, Marie-Sophie Metzger, Navina Kuss, Kirsten Buschmann
Rok vydání: 2014
Předmět:
Zdroj: BMC Immunology
ISSN: 1471-2172
DOI: 10.1186/s12865-014-0053-0
Popis: Background Insufficient leukocyte recruitment may be one reason for the high incidence of life-threatening infections in preterm infants. Since the receptor of advanced glycation end products (RAGE) is a known leukocyte adhesion molecule and highly expressed during early development, we asked whether RAGE plays a role for leukocyte recruitment in preterm and term infants. Methods Leukocyte adhesion was analyzed in dynamic flow chamber experiments using isolated leukocytes of cord blood from extremely premature (35 weeks of gestation) and compared to the results of adults. For fluorescent microscopy leukocytes were labeled with rhodamine 6G. In the respective age groups we also measured the plasma concentration of soluble RAGE (sRAGE) by ELISA and Mac-1 and LFA-1 expression on neutrophils by flow cytometry. Results The adhesive functions of fetal leukocytes significantly increase with gestational age. In all age groups, leukocyte adhesion was crucially dependent on RAGE. In particular, RAGE was equally effective to mediate leukocyte adhesion when compared to ICAM-1. The plasma levels of sRAGE were high in extremely premature infants and decreased with increasing gestational age. In contrast, expression of β2-Integrins Mac-1 and LFA-1 which are known ligands for RAGE and ICAM-1 did not change during fetal development. Conclusion We conclude that RAGE is a crucial leukocyte adhesion molecule in both preterm and term infants. Electronic supplementary material The online version of this article (doi:10.1186/s12865-014-0053-0) contains supplementary material, which is available to authorized users.
Databáze: OpenAIRE
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