TY - JOUR

T1 - Transient depletion of T cells with high LFA-1 expression from peripheral circulation during acute Plasmodium falciparum malaria

AU - Hviid, L

AU - Theander, T G

AU - Abdulhadi, N H

AU - Abu-Zeid, Y A

AU - Bayoumi, R A

AU - Jensen, J B

N1 - Keywords: Acute Disease; Animals; Antigens, CD2; Antigens, Differentiation, T-Lymphocyte; Cell Adhesion Molecules; Humans; Intercellular Adhesion Molecule-1; Lymphocyte Activation; Lymphocyte Function-Associated Antigen-1; Malaria; Plasmodium falciparum; Receptors, Immunologic; Receptors, Interleukin-2; T-Lymphocytes

PY - 1991

Y1 - 1991

N2 - Acute P. falciparum malaria is associated with loss of in vitro T cell responsiveness to antigenic stimulation, and with high plasma levels of soluble interleukin 2 receptor (IL 2R). In the present study peripheral T cells from acute P. falciparum malaria patients from a malaria-endemic area of Sudan were analyzed for expression of cell surface antigens associated with T lymphocyte adhesion, activation and maturation. The results were compared to results from T cells obtained from the same donors either before the attack, or during convalescence. Most donors showed a remarkable loss of T cells with high expression of the surface marker LFA-1 (CD11a/CD18) during the clinical episode, in addition to the functional changes described above. Two donors that did not show phenotypic changes were furthermore characterized by having an unabated proliferative response and normal plasma IL 2R levels. All peripheral CD3+ T lymphocytes expressed LFA-1, which had a clearly bimodal distribution on these cells. The T cell subpopulation having high LFA-1 expression (LFA-1++) was composed of both memory and unprimed T cells, according to their expression of CD45RA and CD45R0. Analysis of expression of membrane-bound IL 2R (CD25) and ICAM-1 (CD54) did not reveal in vivo activated T cells in the peripheral blood of the patients. Taken together, these data suggest that circulating T cells recognizing parasite antigens are temporarily withdrawn from peripheral circulation during P. falciparum malaria.

AB - Acute P. falciparum malaria is associated with loss of in vitro T cell responsiveness to antigenic stimulation, and with high plasma levels of soluble interleukin 2 receptor (IL 2R). In the present study peripheral T cells from acute P. falciparum malaria patients from a malaria-endemic area of Sudan were analyzed for expression of cell surface antigens associated with T lymphocyte adhesion, activation and maturation. The results were compared to results from T cells obtained from the same donors either before the attack, or during convalescence. Most donors showed a remarkable loss of T cells with high expression of the surface marker LFA-1 (CD11a/CD18) during the clinical episode, in addition to the functional changes described above. Two donors that did not show phenotypic changes were furthermore characterized by having an unabated proliferative response and normal plasma IL 2R levels. All peripheral CD3+ T lymphocytes expressed LFA-1, which had a clearly bimodal distribution on these cells. The T cell subpopulation having high LFA-1 expression (LFA-1++) was composed of both memory and unprimed T cells, according to their expression of CD45RA and CD45R0. Analysis of expression of membrane-bound IL 2R (CD25) and ICAM-1 (CD54) did not reveal in vivo activated T cells in the peripheral blood of the patients. Taken together, these data suggest that circulating T cells recognizing parasite antigens are temporarily withdrawn from peripheral circulation during P. falciparum malaria.

M3 - Journal article

C2 - 1674690

VL - 21

SP - 1249

EP - 1253

JO - European Journal of Immunology

JF - European Journal of Immunology

SN - 0014-2980

IS - 5

ER -