Characterization of factor H-related cell membrane molecules expressed by human B lymphocytes and neutrophil granulocytes.

Abstract:

:The human factor H protein family comprises six plasma glycoproteins. Earlier we described a membranal factor H-related (mFHR) molecule that is expressed by human B lymphoblastoid cell lines and exerts cofactor activity. In our present study we screened human blood cells for the presence of mFHR proteins and further characterized these molecules. By cytofluorimetry it is shown that the factor H-specific rabbit antiserum reacts strongly with B cells and neutrophil granulocytes, but not with T cells and monocytes. On B lymphocytes mFHR is shown to be down-regulated upon activation of the cells via sIg. In experiments studying which short consensus repeat (SCR) domains are part of the cell membrane proteins we found that antibodies raised against SCRs 1-4, 19-20 and FHR-3 bound to neutrophils but not to B cells. While mFHRs derived both from B cells and granulocytes are shown to bind heparin, their size and structure are different as revealed by Western blotting. A further characteristic of the granulocyte-derived mFHR is its sensitivity to the PI-specific PLCgamma enzyme. These data demonstrate the existence of new members of the FHR protein family, as two distinct, membranal forms are identified. Based on the differences, the B cell derived molecule is termed mFHR-1 and the neutrophil derived protein mFHR-2.

journal_name

Immunol Lett

journal_title

Immunology letters

authors

Józsi M,Kapus A,Kerekes K,Kármán J,Bajtay Z,Zipfel PF,Erdei A

doi

10.1016/s0165-2478(01)00194-8

subject

Has Abstract

pub_date

2001-05-01 00:00:00

pages

55-62

issue

1

eissn

0165-2478

issn

1879-0542

pii

S0165-2478(01)00194-8

journal_volume

77

pub_type

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