Ls. Poritz et al., DECREASED EXPRESSION OF LFA-1 ON PERIPHERAL-BLOOD LYMPHOCYTES IN GRAFT-VERSUS-HOST DISEASE, The Journal of surgical research, 69(2), 1997, pp. 316-320
We have previously demonstrated an increase in lymphocyte function ass
ociated antigen-1 (LFA-1) expression in the native intestines of anima
ls with graft versus host disease (GVHD) after small bowel transplanta
tion (SBTx). The present study evaluated LFA-1 expression on periphera
l blood lymphocytes (PBLs) during GVHD. GVHD was created in LBNF1 rats
by heterotopic vascularized SBTx from Lewis donors and compared to sh
am-op controls and cyclosporine-treated SBTx rats (SBTx-CyA, 10 mg/kg/
day). PBLs were harvested on Postop Day 13 when signs of severe GVHD w
ere present and PBLs were stained for LFA-1, CD3 (T-cell marker), and
CD45 (B cell marker) and analyzed on an Epics 5 dow cytometer. Mesente
ric lymph node (MLN) lymphocytes from the native intestines were also
harvested for each group and stained for LFA-1. There were significant
decreases in LFA-1, CD3, and CD45 PBL expression in rats with GVHD. C
yA treatment corrected the abnormal CD3 and CD45 ratios, but not LFA-1
expression. It is concluded that: (1) The proportion of PBLs expressi
ng LEA-I is depressed in animals with clinical GVHD consistent with th
eir recruitment into the host's inflamed tissues. (2) CyA treatment co
rrects the abnormalities in T and B cell ratios but not the decreased
expression of LFA-1 on PBLs and may relate to its known imperfect abil
ity to treat GVHD. (C) 1997 Academic Press.