In vivo migration of tonsil lymphocytes in rheumatoid synovial tissue engrafted in SCID mice: involvement of LFA-1.

Abstract:

:Integrin-adressin binding is a critical step in lymphocte attachment to target tissues. The mucosal recognition systems (alpha E beta 7, alpha 4 beta 7, MADcam-1) have been implicated in the autoimmune process in rheumatoid arthritis. We developed a model for in vivo study of radio-labelled lymphocyte circulation and their attachment to human rheumatoid synovium. We studied the homing of tonsil lymphocytes, considered as mucosal lymphocytes, and the involvement of alpha E beta 7 integrin and LFA1 in the homing of tonsil lymphocytes. We engrafted human rheumatoid synovium subcutaneously in 6 week old SCID CB17 mice. Three weeks later, we injected intraperitoneally 20 IO6 human peripheral blood or tonsil mononuclear cells, previously labelled with 3 mCFi HMPAO-99mTc. A mouse total body scintigram was obtained 20 h postinjection. The same protocol was performed after treatment of the MNC and mAb against LFA-1 (CD11a) or alpha E beta 7 (CD103). Tonsil MNC retention in the rheumatoid synovial graft 20 h post-injection was enhanced compared to blood MNC (12731 +/- 8297cpm/200 pixel) versus 5982 +/- 4713cpm/200 pixel, p < 0.05). A monoclonal antibody against LFA 1 decreased the activity in the graft (4152 +/- 1287 cpm/200 pixel), p < 0.05. No significant difference in tonsil MNC attachment to rheumatoid synovial tissue was observed with a mAb against alpha E beta 7 (8057 +/- 5009 cpm/200 pixel). Our results showed an increase in radiolabelled mucosal MNC migration in synovial tissue engrafted in SCID mice compared with blood MNC. Moreover, the date suggest that LFA-1 but not the alpha E beta 7 integrin is involved in tonsil MNC binding to synovial tissue in RA.

journal_name

Autoimmunity

journal_title

Autoimmunity

authors

Jorgensen C,Couret I,Canovas F,Bologna C,Brochier J,Reme T,Sany J

doi

10.3109/08916939608995363

subject

Has Abstract

pub_date

1996-01-01 00:00:00

pages

179-85

issue

3

eissn

0891-6934

issn

1607-842X

journal_volume

24

pub_type

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