Abstract:
BACKGROUND:Human and rodent leukocytes express high levels of the glucocorticoid-inducible protein annexin 1 (ANXA1) (previously referred to as lipocortin 1). Neutrophils and monocytes have abundant ANXA1 levels. AIM:We have investigated, for the first time, ANXA1 ultrastructural expression in rat eosinophils and compared it with that of extravasated neutrophils. The effect of inflammation (carrageenin peritonitis) was also monitored. METHODS:Electron microscopy was used to define the sub-cellular localisation of ANXA1 in rat eosinophils and neutrophils extravasated in the mesenteric tissue. A pair of antibodies raised against the ANXA1 N-terminus (i.e. able to recognise intact ANXA1, termed LCPS1) or the whole protein (termed LCS3) was used to perform the ultrastructural analysis. RESULTS:The majority of ANXA1 was localised in the eosinophil cytosol (approximately 60%) and nucleus (30-40%), whereas a small percentage was found on the plasma membrane (< 10%). Within the cytosol, the protein was equally distributed in the matrix and in the granules, including those containing the typical crystalloid. The two anti-ANXA1 antibodies gave similar results, with the exception that LCPS1 gave a lower degree of immunoreactivity in the plasma membrane. Inflammation (i.e. carrageenin injection) produced a modest increase in eosinophil-associated ANXA1 reactivity (significant only in the cytoplasm compartment). Extravasated neutrophils, used for comparative purposes, displayed a much higher degree of immunoreactivity for the protein. CONCLUSION:We describe for the first time ANXA1 distribution in rat eosinophil by ultrastructural analysis, and report a different protein mobilisation from extravasated neutrophils, at least in this acute model of peritonitis.
journal_name
Mediators Inflammjournal_title
Mediators of inflammationauthors
Oliani SM,Damazo AS,Perretti Mdoi
10.1080/09629350210000015683subject
Has Abstractpub_date
2002-10-01 00:00:00pages
287-92issue
5eissn
0962-9351issn
1466-1861journal_volume
11pub_type
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journal_title:Mediators of inflammation
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pub_type: 杂志文章,评审
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pub_type: 杂志文章
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journal_title:Mediators of inflammation
pub_type: 临床试验,杂志文章
doi:10.1080/09629350123056
更新日期:2001-02-01 00:00:00