Apoptosis by CD95 (Fas)-dependent and -independent mechanisms in Peyer's patch lymphocytes in murine retrovirus-induced immunodeficiency syndrome.
CD95 (Fas)/CD95 ligand (CD95 L)-mediated apoptosis is thought to be involved in the delayed progression of murine AIDS (MAIDS) induced by LP-BM5 murine leukemia virus (MuLV). We show evidence of apoptosis in lymphocytes of Peyer's patches (PP) at the early stage of MAIDS. Both T and B cells in PP expressed CD95 at the early stage of MAIDS and decreased in number thereafter. The decrease in T cells was not evident in CD95-mutated lpr mice with MAIDS, suggesting that CD95/CD95 L interaction is involved in the apoptosis of T cells in PP during the course of MAIDS. On the other hand, the number of B cells was also decreased in PP of lpr mice with MAIDS. The proliferative ability of B cells in PP of MAIDS mice in response to immunoglobulin M cross-linking or lipopolysaccharide was severely impaired, while the B cells normally proliferated in response to anti-CD40 monoclonal antibody. These findings imply that aberrantly activated B cells in PP undergo apoptosis independently of the CD95/CD95 L system during the course of infection with MAIDS virus.
Usami
J
J
Department of Internal Medicine, Nagoya University Branch Hospital, Japan.
Hiromatsu
K
K
Aoki
Y
Y
Kobayashi
N
N
Makino
M
M
Yagita
H
H
Matsumoto
Y
Y
Maeda
K
K
Yoshikai
Y
Y
D000818:Animals; D017209:Apoptosis / Q000502:physiology*; D001402:B-Lymphocytes / Q000276:immunology* / Q000821:virology; D002452:Cell Count; D002455:Cell Division; D002460:Cell Line; D003673:Defective Viruses / Q000276:immunology; D018450:Disease Progression; D053222:Fas Ligand Protein; D005260:Female; D017353:Gene Deletion; D009052:Leukemia Virus, Murine / Q000276:immunology*; D008562:Membrane Glycoproteins / Q000276:immunology*; D051379:Mice; D008810:Mice, Inbred C57BL; D019463:Mice, Inbred MRL lpr; D016183:Murine Acquired Immunodeficiency Syndrome / Q000276:immunology* / Q000473:pathology; D010581:Peyer's Patches / Q000166:cytology / Q000276:immunology*; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology; D019014:fas Receptor / Q000235:genetics / Q000276:immunology*
D053222:Fas Ligand Protein; C505658:Fasl protein, mouse; D008562:Membrane Glycoproteins; D019253:Proto-Oncogene Proteins c-bcl-2; D019014:fas Receptor