Down-regulation of L-selectin surface expression by various leukocyte isolation procedures.

Abstract:

:L-selectin, a cell surface glycoprotein expressed on lymphocytes, granulocytes, and monocytes, has been implicated in lymphocyte homing and extravasation of phagocytic leukocytes into areas of inflammation. Considerable differences of L-selectin expression among various individuals has been reported, with clinical correlations to perinatal events, maturation, and circadian rhythm. In this study, L-selectin expression of various white blood cells was found to be differentially sensitive to ficoll-hypaque or percoll density gradient centrifugation. After density gradient centrifugation, a significant loss of median monocyte L-selectin expression was observed when compared to time and temperature-matched controls or results obtained by whole blood incubation with anti-L-selectin monoclonal antibodies followed by simultaneous leukocyte fixation and red cell lysis. Mock treatment itself was associated with a variable L-selectin loss of monocytes but not lymphocytes or granulocytes. Ficoll-hypaque or percoll density gradient centrifugation resulted in significant L-selectin down-regulation of lymphocytes while granulocytes separated from lymphocytes and monocytes by ficoll-hypaque or percoll retained full L-selectin surface reactivity. L-selectin downregulation was seen also after colloid sedimentation with hydroxy-ethyl starch. It is concluded that unseparated blood should be used for measuring L-selectin expression.

journal_name

Scand J Immunol

authors

Stibenz D,Bührer C

subject

Has Abstract

pub_date

1994-01-01 00:00:00

pages

59-63

issue

1

eissn

0300-9475

issn

1365-3083

journal_volume

39

pub_type

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